Please enter a valid full or partial manufacturer part number with a minimum of 3 letters or numbers

    PCA9551PW Search Results

    SF Impression Pixel

    PCA9551PW Price and Stock

    NXP Semiconductors PCA9551PW,118

    IC LED DRVR PS PWM 25MA 16TSSOP
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey PCA9551PW,118 Digi-Reel 10,393 1
    • 1 $2.24
    • 10 $1.656
    • 100 $1.3517
    • 1000 $1.192
    • 10000 $1.192
    Buy Now
    PCA9551PW,118 Cut Tape 10,393 1
    • 1 $2.24
    • 10 $1.656
    • 100 $1.3517
    • 1000 $1.192
    • 10000 $1.192
    Buy Now
    PCA9551PW,118 Reel 7,500 2,500
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $1.15213
    Buy Now
    Avnet Americas PCA9551PW,118 Ammo Pack 1
    • 1 $2.4
    • 10 $2.04
    • 100 $1.74
    • 1000 $1.74
    • 10000 $1.74
    Buy Now
    PCA9551PW,118 Reel 16 Weeks 2,500
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $1.05816
    Buy Now
    PCA9551PW,118 Reel 16 Weeks 2,500
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $1.05816
    Buy Now
    Mouser Electronics PCA9551PW,118 10,463
    • 1 $2.24
    • 10 $1.52
    • 100 $1.36
    • 1000 $1.2
    • 10000 $1.09
    Buy Now
    Verical PCA9551PW,118 2,565 6
    • 1 -
    • 10 $1.5905
    • 100 $1.3195
    • 1000 $1.0685
    • 10000 $1.0685
    Buy Now
    PCA9551PW,118 90 18
    • 1 -
    • 10 -
    • 100 $1.675
    • 1000 $1.675
    • 10000 $1.675
    Buy Now
    Arrow Electronics PCA9551PW,118 Cut Strips 2,565 16 Weeks 1
    • 1 $2.087
    • 10 $1.5905
    • 100 $1.3195
    • 1000 $1.0685
    • 10000 $1.0685
    Buy Now
    Newark PCA9551PW,118 Cut Tape 2,482 1
    • 1 $2.4
    • 10 $2.04
    • 100 $1.74
    • 1000 $1.43
    • 10000 $1.43
    Buy Now
    PCA9551PW,118 Reel 2,500
    • 1 $1.4
    • 10 $1.4
    • 100 $1.4
    • 1000 $1.4
    • 10000 $1.25
    Buy Now
    Bristol Electronics PCA9551PW,118 1,135
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    TME PCA9551PW,118 2,150 1
    • 1 $2.19
    • 10 $1.78
    • 100 $1.41
    • 1000 $1.31
    • 10000 $1.31
    Buy Now
    Ameya Holding Limited PCA9551PW,118 5,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    Avnet Silica PCA9551PW,118 18 Weeks 2,500
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Buy Now
    Chip1Stop PCA9551PW,118 Cut Tape 90
    • 1 $2.79
    • 10 $1.93
    • 100 $1.8
    • 1000 $1.8
    • 10000 $1.8
    Buy Now
    EBV Elektronik PCA9551PW,118 2,500 18 Weeks 2,500
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Buy Now

    NXP Semiconductors PCA9551PW118

    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Bristol Electronics PCA9551PW118 2,500
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote

    NXP Semiconductors PCA9551PW

    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Bristol Electronics PCA9551PW 821
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    ComSIT USA PCA9551PW 156
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote

    Philips Semiconductors PCA9551PW

    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Bristol Electronics PCA9551PW 270 2
    • 1 -
    • 10 $2.025
    • 100 $1.0125
    • 1000 $1.0125
    • 10000 $1.0125
    Buy Now
    Quest Components PCA9551PW 560
    • 1 $6.3453
    • 10 $6.3453
    • 100 $3.9129
    • 1000 $3.4899
    • 10000 $3.4899
    Buy Now
    PCA9551PW 216
    • 1 $3.6
    • 10 $3.6
    • 100 $1.35
    • 1000 $1.26
    • 10000 $1.26
    Buy Now
    PCA9551PW 17
    • 1 $3.6
    • 10 $2.25
    • 100 $2.25
    • 1000 $2.25
    • 10000 $2.25
    Buy Now
    PCA9551PW 3
    • 1 $1.5325
    • 10 $1.4099
    • 100 $1.4099
    • 1000 $1.4099
    • 10000 $1.4099
    Buy Now

    NXP Semiconductors PCA9551PW,112

    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Bristol Electronics PCA9551PW,112 40
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    PCA9551PW,112 10
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    Quest Components PCA9551PW,112 32
    • 1 $2.548
    • 10 $1.911
    • 100 $1.5925
    • 1000 $1.5925
    • 10000 $1.5925
    Buy Now
    PCA9551PW,112 16
    • 1 $3.0576
    • 10 $2.2932
    • 100 $1.911
    • 1000 $1.911
    • 10000 $1.911
    Buy Now
    Rochester Electronics PCA9551PW,112 43 1
    • 1 $1.02
    • 10 $1.02
    • 100 $0.9588
    • 1000 $0.867
    • 10000 $0.867
    Buy Now

    PCA9551PW Datasheets (9)

    Part ECAD Model Manufacturer Description Curated Datasheet Type PDF
    PCA9551PW NXP Semiconductors LED dimming with GPIO expansion; NXP 2/4/8/16-bit I2C/SMBus LED dimmers PCA9530/31/32/33 Original PDF
    PCA9551PW NXP Semiconductors LED blinking with GPIO expansion; NXP 2/4/8/16-bit I2C/SMBus LED blinkers PCA9550/51/52/53 Original PDF
    PCA9551PW NXP Semiconductors 8-bit I2C-bus LED driver with programmable blink rates Original PDF
    PCA9551PW Philips Semiconductors 8-bit I2C LED driver with programmable blink rates Original PDF
    PCA9551PW Philips Semiconductors 8 Bit I2C LED Driver with Programmable Blink Rates Original PDF
    PCA9551PW,112 NXP Semiconductors 8-bit I2C-bus LED driver with programmable blink rates - # of Addresses: 8 ; I2C-bus: 400 kHz; Max Sink Current per bit: 25 mA; Max Sink Current, per package: 100 mA; Number of bits: 8 ; Operating temperature: -40~85 Cel; Operating voltage: 2.3~5.5 VDC; PWMs: 2 (40 Hz to 6.4 sec) ; Reset input pin: yes; Package: SOT403-1 (TSSOP16); Container: Tube Original PDF
    PCA9551PW,118 NXP Semiconductors 8-bit I2C-bus LED driver with programmable blink rates - # of Addresses: 8 ; I2C-bus: 400 kHz; Max Sink Current per bit: 25 mA; Max Sink Current, per package: 100 mA; Number of bits: 8 ; Operating temperature: -40~85 Cel; Operating voltage: 2.3~5.5 VDC; PWMs: 2 (40 Hz to 6.4 sec) ; Reset input pin: yes; Package: SOT403-1 (TSSOP16); Container: Reel Pack, SMD, 13" Original PDF
    PCA9551PW/G,118 NXP Semiconductors PCA9551PW/G - 8-bit I2C-bus LED driver with programmable blink rates, SOT403-1 Package, Standard Marking, Reel Pack, SMD, 13" Original PDF
    PCA9551PW-T NXP Semiconductors 8-bit I2C-bus LED driver with programmable blink rates - # of Addresses: 8 ; I2C-bus: 400 kHz; Max Sink Current per bit: 25 mA; Max Sink Current, per package: 100 mA; Number of bits: 8 ; Operating temperature: -40~85 Cel; Operating voltage: 2.3~5.5 VDC; PWMs: 2 (40 Hz to 6.4 sec) ; Reset input pin: yes Original PDF

    PCA9551PW Datasheets Context Search

    Catalog Datasheet MFG & Type PDF Document Tags

    AN264

    Abstract: PCA9552 PCA9552BS-T PCA9551 JESD22-A114 JESD22-A115 JESD78 PCA9550 PCA9553
    Text: NXP 2/4/8/16-bit I2C/SMBus LED blinkers PCA9550/51/52/53 LED blinking with GPIO expansion These I2C/SMBus-compatible GPIO expanders, optimized for blinking in LED-status applications, support two user-programmable blink rates, without overloading the I2C-bus or tying up the I2Cbus master.


    Original
    PDF 2/4/8/16-bit PCA9550/51/52/53 PCA9551PW PCA9551DP-T PCA9552PW PCA9552DP-T PCA9553DP/01-T PCA9551BS-T PCA9552BS-T AN264 PCA9552 PCA9552BS-T PCA9551 JESD22-A114 JESD22-A115 JESD78 PCA9550 PCA9553

    PCA9531

    Abstract: AN264 AN469 PCA9530 PCA9532 PCA9533 industrial tube company PCA9533-2 AN-264 philips components LED
    Text: PCA9530, PCA9533, PCA9531 & PCA9532 2, 4, 8 and 16-bit I2C and SMBus LED Dimmers with Reset The PCA9530, PCA9533, PCA9531 and PCA9532 are I2C & SMBus I/O expanders optimized for dimming LEDs. Two user programmable blink rates allow dimming and blinking of


    Original
    PDF PCA9530, PCA9533, PCA9531 PCA9532 16-bit PCA9531 PCA9532 AN264 AN469 PCA9530 PCA9533 industrial tube company PCA9533-2 AN-264 philips components LED

    BLF4G08LS-160A

    Abstract: J3A080GA4/T0BG1610 MARKING S08 NXP TJA1050T-CM,11 power+wizard+1.1+fault+codes SCC2691AC1A28 IP5004CX6 TDA8275AHN/C1,557 H3-BGA3XX_11 BZA456A
    Text: NXP Semiconductors Product Discontinuation DN66 June 30, 2010 SEE DN66 NOTICE LETTER FOR APPLICABLE LAST TIME BUY TERMS, CONDITIONS AND CODE DEFINITIONS FOR THESE DISCONTINUED PRODUCTS. FOR ADDED INFORMATION, REFER TO NXP WEB-SITE "http://www.nxp.com/products/eol/"


    Original
    PDF 31-Dec-10 30-Jun-11 UBA2074AT/N1 UBA2074T/N1 UBA2074T/N1 31-Mar-11 UBA2074TS/N1 UBA2074TS/N1 BLF4G08LS-160A J3A080GA4/T0BG1610 MARKING S08 NXP TJA1050T-CM,11 power+wizard+1.1+fault+codes SCC2691AC1A28 IP5004CX6 TDA8275AHN/C1,557 H3-BGA3XX_11 BZA456A

    schematic diagram atx Power supply 500w

    Abstract: pioneer PAL 012A 1000w inverter PURE SINE WAVE schematic diagram 600va numeric ups circuit diagrams winbond bios 25064 TLE 9180 infineon smsc MEC 1300 nu TBE schematic diagram inverter 2000w DK55 circuit diagram of luminous 600va UPS
    Text: QUICK INDEX NEW IN THIS ISSUE! Detailed Index - See Pages 3-24 Digital Signal Processors, iCoupler , iMEMS® and iSensor . . . . . 805, 2707, 2768-2769 Connectors, Cable Assemblies, IC Sockets . . . . . . . . . . . 28-568 RF Connectors . . . . . . . . . . . . . . . . . . . . . . Pages 454-455


    Original
    PDF P462-ND P463-ND LNG295LFCP2U LNG395MFTP5U US2011) schematic diagram atx Power supply 500w pioneer PAL 012A 1000w inverter PURE SINE WAVE schematic diagram 600va numeric ups circuit diagrams winbond bios 25064 TLE 9180 infineon smsc MEC 1300 nu TBE schematic diagram inverter 2000w DK55 circuit diagram of luminous 600va UPS

    HVQFN16

    Abstract: JESD22-A114 JESD22-A115 JESD78 PCA9551 PCA9554 PCF8574 TSSOP16 PCA955X
    Text: PCA9551 8-bit I2C-bus LED driver with programmable blink rates Rev. 07 — 23 February 2007 Product data sheet 1. General description The PCA9551 LED blinker blinks LEDs in I2C-bus and SMBus applications where it is necessary to limit bus traffic or free up the I2C-bus master's MCU, MPU, DSP, chip set,


    Original
    PDF PCA9551 PCA9551 PCF8574 PCA9554, HVQFN16 JESD22-A114 JESD22-A115 JESD78 PCA9554 TSSOP16 PCA955X

    Untitled

    Abstract: No abstract text available
    Text: INTEGRATED CIRCUITS PCA9551 8-bit I2C LED driver with programmable blink rates Product data Philips Semiconductors 2002 Jun 13 Philips Semiconductors Product data 8-bit I2C LED driver with programmable blink rates PCA9551 DESCRIPTION The PCA9551 LED Blinker blinks LEDs in I@C and SMBus


    Original
    PDF PCA9551 PCA9551 PCF8574 PCA9554,

    pca953x

    Abstract: SAA1064 APPLICATION NOTE PCA9531 SAA1064 SOFTWARE PROGRAM PCA95xx SAA1064 PCA9552 74HC1G66 AN264 PCA9530
    Text: INTEGRATED CIRCUITS APPLICATION NOTE AN264 I2C DEVICES for LED DISPLAY CONTROL PCA9530, PCA9531, PCA9532, PCA9533, PCA9550, PCA9551, PCA9552, PCA9553, SAA1064 Abstract - Philips Semiconductors family of LED Control Devices: PCA953x LED Dimmers, PCA955x LED


    Original
    PDF AN264 PCA9530, PCA9531, PCA9532, PCA9533, PCA9550, PCA9551, PCA9552, PCA9553, SAA1064 pca953x SAA1064 APPLICATION NOTE PCA9531 SAA1064 SOFTWARE PROGRAM PCA95xx SAA1064 PCA9552 74HC1G66 AN264 PCA9530

    AN469

    Abstract: PCA9552 PHILIPS schematic PCA9550 PCA9551 philips led esd
    Text: PCA9550/51/52 Philips Configuration System Management ICs 2, 8 and 16-bit I2C and SMBus LED Blinkers with Reset Description The PCA9550, PCA9551 and PCA9552 blink LEDs in I2C and SMBus applications where it is necessary to limit bus traffic or free up the I2C


    Original
    PDF PCA9550/51/52 16-bit PCA9550, PCA9551 PCA9552 301673/8k/FP/2pp/1201 AN469 PHILIPS schematic PCA9550 philips led esd

    Untitled

    Abstract: No abstract text available
    Text: PCA9551 8-bit I2C-bus LED driver with programmable blink rates Rev. 08 — 31 July 2008 Product data sheet 1. General description The PCA9551 LED blinker blinks LEDs in I2C-bus and SMBus applications where it is necessary to limit bus traffic or free up the I2C-bus master's MCU, MPU, DSP, chip set,


    Original
    PDF PCA9551 PCA9551 PCF8574 PCA9554,

    Untitled

    Abstract: No abstract text available
    Text: INTEGRATED CIRCUITS PCA9551 8-bit I2C LED driver with programmable blink rates Product data Supersedes data of 2002 May 13 Philips Semiconductors 2002 Sep 27 Philips Semiconductors Product data 8-bit I2C LED driver with programmable blink rates PCA9551 DESCRIPTION


    Original
    PDF PCA9551 PCA9551 PCF8574 PCA9554,

    TDA5051AT

    Abstract: PCA9541A LM75AD SA630D
    Text: Technical Information Technical Information for Breakout Boards OM13491, OM13492, OM13493, OM13494, OM13495, OM13496, OM13497 Preliminary 1 — 9/6/2013 Document information Info Content Keywords Abstract Fm+, I2C-bus, Surface Mount Package, Breakout Board


    Original
    PDF OM13491, OM13492, OM13493, OM13494, OM13495, OM13496, OM13497 TDA5051AT PCA9541A LM75AD SA630D

    HVQFN16

    Abstract: JESD22-A114 JESD22-A115 JESD78 PCA9551 PCA9554 PCF8574 TSSOP16 ic 11155
    Text: INTEGRATED CIRCUITS PCA9551 8-bit I2C LED driver with programmable blink rates Product data Supersedes data of 2002 Sep 27 Philips Semiconductors 2003 Feb 20 Philips Semiconductors Product data 8-bit I2C LED driver with programmable blink rates PCA9551 DESCRIPTION


    Original
    PDF PCA9551 PCA9551 PCF8574 PCA9554, HVQFN16 JESD22-A114 JESD22-A115 JESD78 PCA9554 PCF8574 TSSOP16 ic 11155

    pca953x

    Abstract: No abstract text available
    Text: INTEGRATED CIRCUITS PCA9551 8-bit I2C LED driver with programmable blink rates Product data Supersedes data of 2003 Feb 24 Philips Semiconductors 2003 May 02 Philips Semiconductors Product data 8-bit I2C LED driver with programmable blink rates PCA9551 DESCRIPTION


    Original
    PDF PCA9551 PCA9551 PCF8574 PCA9554, pca953x

    PCA9531

    Abstract: 16073 AN264 PCA9532PW-T JESD22-A114 JESD22-A115 JESD78 PCA9530 PCA9532 PCA9533
    Text: NXP 2/4/8/16-bit I2C/SMBus LED dimmers PCA9530/31/32/33 LED dimming with GPIO expansion These I2C/SMBus-compatible GPIO expanders, optimized for dimming LEDs, support two userprogrammable blink and dimming rates, programmable up to 256 levels of brightness, without


    Original
    PDF 2/4/8/16-bit PCA9530/31/32/33 PCA9551PW PCA9531PW-T PCA9532PW PCA9532PW-T PCA9533DP/01-T PCA9531BS-T PCA9532BS-T PCA9531 16073 AN264 PCA9532PW-T JESD22-A114 JESD22-A115 JESD78 PCA9530 PCA9532 PCA9533

    Untitled

    Abstract: No abstract text available
    Text: INTEGRATED CIRCUITS PCA9551 8-bit I2C LED driver with programmable blink rates Product data Philips Semiconductors 2002 Apr 26 Philips Semiconductors Product data 8-bit I2C LED driver with programmable blink rates PCA9551 DESCRIPTION The PCA9551 LED Blinker blinks LEDs in I@C and SMBus


    Original
    PDF PCA9551 PCA9551 PCF8574 PCA9554,

    pca953x

    Abstract: HVQFN16 JESD22-A114 JESD22-A115 JESD78 PCA9551 PCA9554 PCF8574 TSSOP16 PCA955X
    Text: INTEGRATED CIRCUITS PCA9551 8-bit I2C LED driver with programmable blink rates Product data Supersedes data of 2003 Feb 20 Philips Semiconductors 2003 May 05 Philips Semiconductors Product data 8-bit I2C LED driver with programmable blink rates PCA9551 DESCRIPTION


    Original
    PDF PCA9551 PCA9551 PCF8574 PCA9554, pca953x HVQFN16 JESD22-A114 JESD22-A115 JESD78 PCA9554 PCF8574 TSSOP16 PCA955X

    PCA9551

    Abstract: JESD22-A114 JESD22-A115 JESD78 PCA9554 PCA9634 PCF8574 TSSOP16 PCA955X
    Text: PCA9551 8-bit I2C-bus LED driver with programmable blink rates Rev. 08 — 31 July 2008 Product data sheet 1. General description The PCA9551 LED blinker blinks LEDs in I2C-bus and SMBus applications where it is necessary to limit bus traffic or free up the I2C-bus master's MCU, MPU, DSP, chip set,


    Original
    PDF PCA9551 PCA9551 PCF8574 PCA9554, JESD22-A114 JESD22-A115 JESD78 PCA9554 PCA9634 TSSOP16 PCA955X

    PCA9552

    Abstract: AN264 PCA9551 AN469 PCA9550 PCA9553 PCA9551PW-T CDM 4 Philips PCA9553D/02 PCA9551D
    Text: 2, 4, 8 and 16-bit I2C and SMBus LED Blinkers with Reset PCA9550/PCA9551 PCA9552/PCA9553 The PCA9550, PCA9553, PCA9551 and PCA9552 are I2C & SMBus I/O expanders optimized for blinking LEDs. Two user programmable blink rates allow blinking of LEDs without overloading the bus or tying up the I2C Master.


    Original
    PDF 16-bit PCA9550/PCA9551 PCA9552/PCA9553 PCA9550, PCA9553, PCA9551 PCA9552 PCA9551, AN264 AN469 PCA9550 PCA9553 PCA9551PW-T CDM 4 Philips PCA9553D/02 PCA9551D

    pca953x

    Abstract: PCA9551 JESD22-A114 JESD22-A115 JESD78 PCA9554 PCF8574 TSSOP16 HVQFN16 PCA955X
    Text: INTEGRATED CIRCUITS PCA9551 8-bit I2C LED driver with programmable blink rates Product data sheet Supersedes data of 2003 May 05 Philips Semiconductors 2004 Oct 01 Philips Semiconductors Product data sheet 8-bit I2C LED driver with programmable blink rates


    Original
    PDF PCA9551 PCA9551 PCF8574 PCA9554, pca953x JESD22-A114 JESD22-A115 JESD78 PCA9554 PCF8574 TSSOP16 HVQFN16 PCA955X

    Untitled

    Abstract: No abstract text available
    Text: INTEGRATED CIRCUITS PCA9551 8-bit I2C LED driver with programmable blink rates Product data Philips Semiconductors 2002 May 13 Philips Semiconductors Product data 8-bit I2C LED driver with programmable blink rates PCA9551 DESCRIPTION The PCA9551 LED Blinker blinks LEDs in I@C and SMBus


    Original
    PDF PCA9551 PCA9551 PCF8574 PCA9554,

    PCA9551BS3

    Abstract: No abstract text available
    Text: PCA9551 8-bit I2C-bus LED driver with programmable blink rates Rev. 06 — 7 November 2006 Product data sheet 1. General description The PCA9551 LED blinker blinks LEDs in I2C-bus and SMBus applications where it is necessary to limit bus traffic or free up the I2C-bus master's MCU, MPU, DSP, chip set,


    Original
    PDF PCA9551 PCA9551 PCF8574 PCA9554, PCA9551BS3

    LED37

    Abstract: No abstract text available
    Text: INTEGRATED CIRCUITS PCA9551 8-bit I2C LED driver with programmable blink rates Product data Philips Semiconductors 2003 Feb 20 Philips Semiconductors Product data 8-bit I2C LED driver with programmable blink rates PCA9551 DESCRIPTION The PCA9551 LED Blinker blinks LEDs in I@C and SMBus


    Original
    PDF PCA9551 PCA9551 PCF8574 PCA9554, LED37

    pca953x

    Abstract: PCA95xx SAA1064 SOFTWARE PROGRAM SAA1064 APPLICATION NOTE PCA95X PCA955x PCA9530 AN10146-01 PCA9552 PCA9531
    Text: INTEGRATED CIRCUITS APPLICATION NOTE AN264 I2C DEVICES for LED DISPLAY CONTROL PCA9530, PCA9531, PCA9532, PCA9533, PCA9550, PCA9551, PCA9552, PCA9553, SAA1064 Abstract - Philips Semiconductors family of LED Control Devices: PCA953x LED Dimmers, PCA955x LED


    Original
    PDF AN264 PCA9530, PCA9531, PCA9532, PCA9533, PCA9550, PCA9551, PCA9552, PCA9553, SAA1064 pca953x PCA95xx SAA1064 SOFTWARE PROGRAM SAA1064 APPLICATION NOTE PCA95X PCA955x PCA9530 AN10146-01 PCA9552 PCA9531