Register or Sign In

L4981AD price and stock

L4981AD Details
My Preferred Distributors (0) Authorized (0) Independent (0) Industrial Supplies / MRO (0)
Register or Sign In to sort your Preferred Distributors to the top of the list!

Authorized Distributors

  • Acme Chip Technology
  • Analog Devices Inc
  • Arrow
  • Avnet Americas
  • Bisco
  • Bürklin Elektronik
  • CDM Electronics
  • Chip 1 Exchange
  • Chip1Stop
  • CHIPMALL.COM LIMITED
  • Coilcraft
  • ComSIT USA
  • DB Roberts
  • DigiKey
  • Dynamic Solutions
  • ElectroCraft
  • Electroshield
  • element14
  • ES Components
  • Fairview Microwave
  • Farnell
  • FDH Electronics
  • Flip Electronics
  • Future Electronics
  • GLYN
  • Heilind Electronics
  • Interstate Connecting
  • Jameco
  • Karl Kruse
  • L-com US
  • Maritex
  • Master Electronics
  • Microchip Technology
  • Mouser
  • NAC
  • New Advantage
  • Newark
  • Onlinecomponents.com
  • Ozdisan Elektronik
  • Pasternack Enterprises
  • PEI Genesis
  • Perfect Parts
  • PolyPhaser
  • Powell Electronics
  • Power & Signal
  • PUI
  • Renesas Electronics America
  • Richardson RFPD
  • Rochester
  • RS
  • Rutronik
  • Sager
  • Samtec
  • SiTime Corporation
  • South Electronics
  • Standard Electric
  • STMicroelectronics
  • Symmetry
  • Techni-Tool
  • TestEquity
  • TME
  • Toby Electronics
  • TTI
  • Venkel Ltd.
  • Verical
  • Waytek, Inc.
  • Wuhan P&S

Independent Distributors

  • Ameya
  • Bristol
  • Chip Stock
  • Chip-Germany GmbH
  • Chip1Cloud
  • Chips Pulse
  • Component Electronics, Inc
  • CoreStaff
  • Direct Components
  • EnteerMall
  • Futuretech Components
  • GlobX GmbH
  • LCSC
  • MacroQuest
  • Neutron USA
  • NexGen Digital
  • Quest
  • SEMIX
  • Sense Electronic
  • Sensible Micro Corp
  • Shengyu Electronics
  • Velocity Electronics
  • VRG Components
  • Vyrian
  • Win Source Electronics
Show Filters
Select Manufacturer
Top of Page ↑

Newark Authorized Distributor

Part # Manufacturer Description Stock Price Price Range Buy
L4981AD013TR DISTI # 38Y7867
STMicroelectronics Pfc Controller, 100Khz, 19.5V, Soic-20, Uvlo:14.5V, Supply Voltage Min:-, Supply Voltage Max:19.5V, Startup Current:300Μa, Operating Supply Current:12Ma, Controller Ic Case Style:Soic, No. Of Pins:20Pins, Duty Cycle (%):-, Rohs Compliant: Yes |Stmicroelectronics L4981AD013TR Min Qty: 1 Package Multiple: 1 Date Code: 0 Container: Cut Tape L4981AD013TR Part Details 861
  • 500 $3.1900
  • 250 $3.4600
  • 100 $3.8800
  • 50 $4.1700
  • 25 $4.4700
  • 10 $4.7300
  • 1 $5.2600
$3.1900 / $5.2600 Buy Now L4981AD013TR Part Details
L4981AD DISTI # 89K1330
STMicroelectronics Power Factor Corrector, 19.5V, Soic-20, Supply Voltage Min:12V, Supply Voltage Max:19.5V, Ic Case/Package:Soic, No. Of Pins:20Pins, Operating Temperature Min:-40°C, Operating Temperature Max:125°C, Product Range:-, Duty Cycle (%):-Rohs Compliant: Yes |Stmicroelectronics L4981AD Min Qty: 40 Package Multiple: 1 Date Code: 0 Container: Bulk L4981AD Part Details 0   Buy Now L4981AD Part Details
L4981AD013TR DISTI # 45Y5616
STMicroelectronics Pfc Controller, 100Khz, 19.5V, Soic-20, Uvlo:14.5V, Supply Voltage Min:-, Supply Voltage Max:19.5V, Startup Current:300Μa, Operating Supply Current:12Ma, Controller Ic Case Style:Soic, No. Of Pins:20Pins, Duty Cycle (%):-, Rohs Compliant: Yes |Stmicroelectronics L4981AD013TR Min Qty: 1000 Package Multiple: 1 Date Code: 1 Container: Reel L4981AD013TR Part Details 0
  • 2000 $2.6400
  • 1000 $2.7100
$2.6400 / $2.7100 Buy Now L4981AD013TR Part Details
Top of Page ↑

DigiKey ECIA (NEDA) Member • Authorized Distributor

Part # Manufacturer Description Stock Price Price Range Buy
L4981AD013TR DISTI # 497-4562-1-ND
STMicroelectronics IC PFC CTR AVER CURR 100KHZ 20SO Min Qty: 1 Lead time: 25 Weeks Container: Cut Tape (CT), Digi-Reel®, Tape & Reel (TR) L4981AD013TR Part Details 2211
In Stock
  • 2000 $2.1700
  • 1000 $2.2842
  • 500 $2.7084
  • 250 $3.0184
  • 100 $3.1815
  • 25 $3.6708
  • 10 $3.8830
  • 1 $4.3200
$2.1700 / $4.3200 Buy Now L4981AD013TR Part Details
L4981AD DISTI # 497-1414-5-ND
STMicroelectronics IC PFC CTR AVER CURR 100KHZ 20SO Min Qty: 1 Lead time: 25 Weeks Container: Tube L4981AD Part Details 937
In Stock
  • 2520 $2.1700
  • 1000 $2.2842
  • 520 $2.7084
  • 280 $3.0184
  • 120 $3.1815
  • 40 $3.6710
  • 10 $3.8830
  • 1 $4.3200
$2.1700 / $4.3200 Buy Now L4981AD Part Details
Top of Page ↑

Avnet Americas Authorized Distributor

Part # Manufacturer Description Stock Price Price Range Buy
L4981AD DISTI # L4981AD
STMicroelectronics Power Factor Correction PWM CONTRLR 0.3mA 115KHz 20-Pin SO Tube - Rail/Tube (Alt: L4981AD) RoHS: Compliant Min Qty: 1000 Package Multiple: 1000 Lead time: 30 Weeks, 0 Days Container: Tube L4981AD Part Details 0
  • 100000 $2.1081
  • 10000 $2.1566
  • 8000 $2.2050
  • 6000 $2.2535
  • 4000 $2.3020
  • 2000 $2.3504
  • 1000 $2.3989
$2.1081 / $2.3989 Buy Now L4981AD Part Details
EL4981AD DISTI # E-L4981AD
STMicroelectronics Power Factor Correction PWM CONTRLR 0.3mA 115KHz 20-Pin SO Tube - Rail/Tube (Alt: E-L4981AD) RoHS: Compliant Min Qty: 1000 Package Multiple: 1000 Container: Tube EL4981AD Part Details 0   RFQ EL4981AD Part Details
L4981AD013TR DISTI # L4981AD013TR
STMicroelectronics Power Factor Correction PWM CONTRLR 0.3mA 115KHz 20-Pin SO T/R - Tape and Reel (Alt: L4981AD013TR) RoHS: Compliant Min Qty: 1000 Package Multiple: 1000 Lead time: 45 Weeks, 0 Days Container: Reel L4981AD013TR Part Details 0
  • 100000 $2.1081
  • 10000 $2.1566
  • 8000 $2.2050
  • 6000 $2.2535
  • 4000 $2.3020
  • 2000 $2.3504
  • 1000 $2.3989
$2.1081 / $2.3989 Buy Now L4981AD013TR Part Details
Top of Page ↑

Mouser Electronics ECIA (NEDA) Member • Authorized Distributor

Part # Manufacturer Description Stock Price Price Range Buy
L4981AD DISTI # 511-L4981AD
STMicroelectronics Power Factor Correction - PFC Very High Power RoHS: Compliant L4981AD Part Details 4344
  • 1 $4.3200
  • 10 $3.8900
  • 25 $3.0000
  • 100 $2.7000
  • 250 $2.6000
  • 500 $2.4300
  • 1000 $2.1000
  • 2000 $2.0900
$2.0900 / $4.3200 Buy Now L4981AD Part Details
L4981AD013TR DISTI # 511-L4981AD013TR
STMicroelectronics Power Factor Correction - PFC Very High Power RoHS: Compliant L4981AD013TR Part Details 22
  • 1 $4.3200
  • 10 $3.8900
  • 25 $3.6800
  • 100 $3.1900
  • 250 $3.0200
  • 500 $2.7100
  • 1000 $2.2800
  • 2000 $2.1700
$2.1700 / $4.3200 Buy Now L4981AD013TR Part Details
Top of Page ↑

STMicroelectronics Direct Manufacturer

Part # Manufacturer Description Stock Price Price Range Buy
L4981AD
STMicroelectronics L4981A: Fixed Frequency Average Current Mode, L4981B: Line Modulated Frequency Average Current Mode RoHS: Compliant Min Qty: 1 L4981AD Part Details 4344
  • 1 $4.2300
  • 10 $3.8100
  • 25 $2.9400
  • 100 $2.6500
  • 250 $2.5500
  • 500 $2.3800
$2.3800 / $4.2300 Buy Now L4981AD Part Details
L4981AD013TR
STMicroelectronics L4981A: Fixed Frequency Average Current Mode, L4981B: Line Modulated Frequency Average Current Mode RoHS: Compliant Min Qty: 1 L4981AD013TR Part Details 22
  • 1 $4.2300
  • 10 $3.8100
  • 25 $3.6100
  • 100 $3.1300
  • 250 $2.9600
  • 500 $2.6600
$2.6600 / $4.2300 Buy Now L4981AD013TR Part Details
Top of Page ↑

Future Electronics ECIA (NEDA) Member • Authorized Distributor

Part # Manufacturer Description Stock Price Price Range Buy
L4981AD
STMicroelectronics L4981 Series 19.5 V 16 mA Surface Mount Power Factor Corrector - SOIC-20 RoHS: Compliant pbFree: Yes Min Qty: 40 Package Multiple: 40 Container: Tube L4981AD Part Details 0
Tube
  • 500 $2.1800
  • 200 $2.2900
  • 75 $2.3500
  • 25 $2.4100
  • 1 $2.5100
$2.1800 / $2.5100 Buy Now L4981AD Part Details
L4981AD
STMicroelectronics L4981 Series 19.5 V 16 mA Surface Mount Power Factor Corrector - SOIC-20 RoHS: Compliant pbFree: Yes Min Qty: 1000 Package Multiple: 40 Container: Tube L4981AD Part Details 0
Tube
  • 1600 $2.0500
  • 1000 $2.1200
  • 400 $2.1600
  • 160 $2.2000
  • 40 $2.2700
$2.0500 / $2.2700 Buy Now L4981AD Part Details
L4981AD
STMicroelectronics L4981 Series 19.5 V 16 mA Surface Mount Power Factor Corrector - SOIC-20 RoHS: Compliant pbFree: Yes Min Qty: 1000 Package Multiple: 40 Container: Tube L4981AD Part Details 0
Tube
  • 800 $2.1800
  • 400 $2.2400
  • 200 $2.2800
  • 120 $2.3100
  • 40 $2.3800
$2.1800 / $2.3800 Buy Now L4981AD Part Details
Top of Page ↑

Quest Components  

Part # Manufacturer Description Stock Price Price Range Buy
L4981AD
STMicroelectronics POWER FACTOR CONTROLLER, 20 Pin, SOP L4981AD Part Details 1568
  • 746 $2.4413
  • 333 $2.6854
  • 1 $4.8825
$2.4413 / $4.8825 Buy Now L4981AD Part Details
L4981AD
STMicroelectronics POWER FACTOR CONTROLLER, 20 Pin, SOP L4981AD Part Details 16
  • 7 $3.5805
  • 3 $4.0688
  • 1 $4.8825
$3.5805 / $4.8825 Buy Now L4981AD Part Details
L4981AD013TR
STMicroelectronics POWER FACTOR CONTROLLER, 20 Pin, SOP L4981AD013TR Part Details 1043
  • 680 $2.6775
  • 304 $2.9453
  • 1 $5.3550
$2.6775 / $5.3550 Buy Now L4981AD013TR Part Details
Top of Page ↑

Bristol Electronics  

Part # Manufacturer Description Stock Price Price Range Buy
L4981AD
STMicroelectronics   L4981AD Part Details 1961   RFQ L4981AD Part Details
L4981AD
STMicroelectronics   L4981AD Part Details 16   RFQ L4981AD Part Details
Top of Page ↑

Avnet Americas Authorized Distributor

Part # Manufacturer Description Stock Price Price Range Buy
L4981AD DISTI # L4981AD
STMicroelectronics Power Factor Correction PWM CONTRLR 0.3mA 115KHz 20-Pin SO Tube - Rail/Tube (Alt: L4981AD) RoHS: Compliant Min Qty: 1000 Package Multiple: 1000 Lead time: 30 Weeks, 0 Days Container: Tube L4981AD Part Details 0
  • 100000 $2.1081
  • 10000 $2.1566
  • 8000 $2.2050
  • 6000 $2.2535
  • 4000 $2.3020
  • 2000 $2.3504
  • 1000 $2.3989
$2.1081 / $2.3989 Buy Now L4981AD Part Details
EL4981AD DISTI # E-L4981AD
STMicroelectronics Power Factor Correction PWM CONTRLR 0.3mA 115KHz 20-Pin SO Tube - Rail/Tube (Alt: E-L4981AD) RoHS: Compliant Min Qty: 1000 Package Multiple: 1000 Container: Tube EL4981AD Part Details 0   RFQ EL4981AD Part Details
L4981AD013TR DISTI # L4981AD013TR
STMicroelectronics Power Factor Correction PWM CONTRLR 0.3mA 115KHz 20-Pin SO T/R - Tape and Reel (Alt: L4981AD013TR) RoHS: Compliant Min Qty: 1000 Package Multiple: 1000 Lead time: 45 Weeks, 0 Days Container: Reel L4981AD013TR Part Details 0
  • 100000 $2.1081
  • 10000 $2.1566
  • 8000 $2.2050
  • 6000 $2.2535
  • 4000 $2.3020
  • 2000 $2.3504
  • 1000 $2.3989
$2.1081 / $2.3989 Buy Now L4981AD013TR Part Details
Top of Page ↑

TME ECIA Member • Authorized Distributor

Part # Manufacturer Description Stock Price Price Range Buy
L4981AD DISTI # L4981AD
STMicroelectronics IC: driver, boost, PFC controller,SMPS controller, SO20, 100kHz Min Qty: 1 L4981AD Part Details 169
  • 40 $2.7100
  • 10 $3.4200
  • 3 $3.9500
  • 1 $4.2700
$2.7100 / $4.2700 Buy Now L4981AD Part Details
L4981AD013TR DISTI # L4981AD013TR
STMicroelectronics IC: driver, boost, PFC controller,SMPS controller, SO20, 100kHz Min Qty: 1 L4981AD013TR Part Details 900
  • 250 $2.6400
  • 50 $3.0400
  • 10 $3.5600
  • 3 $3.9500
  • 1 $4.1100
$2.6400 / $4.1100 Buy Now L4981AD013TR Part Details
Top of Page ↑

Avnet Americas Authorized Distributor

Part # Manufacturer Description Stock Price Price Range Buy
L4981AD DISTI # L4981AD
STMicroelectronics Power Factor Correction PWM CONTRLR 0.3mA 115KHz 20-Pin SO Tube - Rail/Tube (Alt: L4981AD) RoHS: Compliant Min Qty: 1000 Package Multiple: 1000 Lead time: 30 Weeks, 0 Days Container: Tube L4981AD Part Details 0
  • 100000 $2.1081
  • 10000 $2.1566
  • 8000 $2.2050
  • 6000 $2.2535
  • 4000 $2.3020
  • 2000 $2.3504
  • 1000 $2.3989
$2.1081 / $2.3989 Buy Now L4981AD Part Details
EL4981AD DISTI # E-L4981AD
STMicroelectronics Power Factor Correction PWM CONTRLR 0.3mA 115KHz 20-Pin SO Tube - Rail/Tube (Alt: E-L4981AD) RoHS: Compliant Min Qty: 1000 Package Multiple: 1000 Container: Tube EL4981AD Part Details 0   RFQ EL4981AD Part Details
L4981AD013TR DISTI # L4981AD013TR
STMicroelectronics Power Factor Correction PWM CONTRLR 0.3mA 115KHz 20-Pin SO T/R - Tape and Reel (Alt: L4981AD013TR) RoHS: Compliant Min Qty: 1000 Package Multiple: 1000 Lead time: 45 Weeks, 0 Days Container: Reel L4981AD013TR Part Details 0
  • 100000 $2.1081
  • 10000 $2.1566
  • 8000 $2.2050
  • 6000 $2.2535
  • 4000 $2.3020
  • 2000 $2.3504
  • 1000 $2.3989
$2.1081 / $2.3989 Buy Now L4981AD013TR Part Details
Top of Page ↑

ComSIT USA  

Part # Manufacturer Description Stock Price Price Range Buy
L4981AD
STMicroelectronics POWER FACTOR CORRECTOR Power Factor Controller, Current-mode, 2A, 115kHz Switching Freq-Max, BCDMOS, PDSO20 RoHS: Not Compliant L4981AD Part Details Europe - 891   RFQ L4981AD Part Details
Top of Page ↑

Ameya Holding Limited  

Part # Manufacturer Description Stock Price Price Range Buy
L4981AD013TR
STMicroelectronics L4981 Series 19.5 V 16 mA Surface Mount Power Factor Corrector - SOIC-20 L4981AD013TR Part Details 5006   RFQ L4981AD013TR Part Details
Top of Page ↑

LCSC  

Part # Manufacturer Description Stock Price Price Range Buy
L4981AD013TR
STMicroelectronics SOIC-20-300mil AC-DC Controllers Regulators ROHS L4981AD013TR Part Details 22695
  • 1000 $1.0608
  • 500 $1.0922
  • 100 $1.1638
  • 30 $1.3249
  • 10 $1.4816
  • 1 $1.7337
$1.0608 / $1.7337 Buy Now L4981AD013TR Part Details
Top of Page ↑

Farnell Authorized Distributor

Part # Manufacturer Description Stock Price Price Range Buy
L4981AD013TR DISTI # 2460846
STMicroelectronics PFC CONTROLLER, 100KHZ, 19.5V, SOIC-20 RoHS: Compliant Min Qty: 1 Lead time: 7 Weeks, 5 Days Container: Cut Tape L4981AD013TR Part Details 861
  • 500 £2.4300
  • 200 £2.6900
  • 50 £2.8400
  • 10 £3.2800
  • 1 £4.2800
£2.4300 / £4.2800 Buy Now L4981AD013TR Part Details
L4981AD013TR DISTI # 2460846RL
STMicroelectronics PFC CONTROLLER, 100KHZ, 19.5V, SOIC-20 RoHS: Compliant Min Qty: 50 Lead time: 7 Weeks, 5 Days Container: Reel L4981AD013TR Part Details 861
  • 500 £2.4300
  • 200 £2.6900
  • 50 £2.8400
£2.4300 / £2.8400 Buy Now L4981AD013TR Part Details
L4981AD013TR DISTI # 2474077
STMicroelectronics PFC CONTROLLER, 100KHZ, 19.5V, SOIC-20 RoHS: Compliant Min Qty: 1000 Lead time: 27 Weeks, 1 Days Container: Reel L4981AD013TR Part Details 0
  • 3000 £1.9000
  • 1000 £1.9400
£1.9000 / £1.9400 Buy Now L4981AD013TR Part Details
Top of Page ↑

Win Source Electronics  

Part # Manufacturer Description Stock Price Price Range Buy
L4981AD
STMicroelectronics IC PFC CTRLR AVERAGE CURR 20SOIC L4981AD Part Details 62041
  • 24 $2.1140
  • 58 $1.7350
  • 90 $1.6810
  • 123 $1.6270
  • 160 $1.5720
  • 213 $1.4100
$1.4100 / $2.1140 Buy Now L4981AD Part Details
L4981AD013TR
STMicroelectronics IC PFC CTRLR AVERAGE CURR 20SOIC / Power Factor Correction and PWM Controller 0.3mA 115kHz 20-Pin SO T/R L4981AD013TR Part Details 122000
  • 30 $1.8370
  • 70 $1.5080
  • 105 $1.4610
  • 145 $1.4130
  • 185 $1.3660
  • 245 $1.2250
$1.2250 / $1.8370 Buy Now L4981AD013TR Part Details
Top of Page ↑

EBV Elektronik Authorized Distributor

Part # Manufacturer Description Stock Price Price Range Buy
L4981AD DISTI # L4981AD
STMicroelectronics Power Factor Correction PWM CONTRLR 0.3mA 115KHz 20-Pin SO Tube (Alt: L4981AD) RoHS: Compliant Min Qty: 40 Package Multiple: 40 Lead time: 3 Weeks, 5 Days L4981AD Part Details EBV - 800   Buy Now L4981AD Part Details
L4981AD013TR DISTI # L4981AD013TR
STMicroelectronics Power Factor Correction PWM CONTRLR 0.3mA 115KHz 20-Pin SO T/R (Alt: L4981AD013TR) RoHS: Compliant Min Qty: 1000 Package Multiple: 1000 Lead time: 3 Weeks, 5 Days L4981AD013TR Part Details EBV - 8000   Buy Now L4981AD013TR Part Details
Top of Page ↑

Avnet Silica Authorized Distributor

Part # Manufacturer Description Stock Price Price Range Buy
L4981AD DISTI # L4981AD
STMicroelectronics Power Factor Correction PWM CONTRLR 0.3mA 115KHz 20-Pin SO Tube (Alt: L4981AD) RoHS: Compliant Min Qty: 40 Package Multiple: 40 Lead time: 2 Weeks, 3 Days L4981AD Part Details Silica - 120   Buy Now L4981AD Part Details
L4981AD013TR DISTI # L4981AD013TR
STMicroelectronics Power Factor Correction PWM CONTRLR 0.3mA 115KHz 20-Pin SO T/R (Alt: L4981AD013TR) RoHS: Compliant Min Qty: 1000 Package Multiple: 1000 Lead time: 2 Weeks, 3 Days L4981AD013TR Part Details Silica - 3000   Buy Now L4981AD013TR Part Details
Top of Page ↑

element14 Asia-Pacific Authorized Distributor

Part # Manufacturer Description Stock Price Price Range Buy
L4981AD013TR DISTI # 2460846RL
STMicroelectronics PFC CONTROLLER, 100KHZ, 19.5V, SOIC-20 RoHS: Compliant Min Qty: 50 Container: Reel L4981AD013TR Part Details 873
  • 500 S$4.5200
  • 200 S$5.0500
  • 50 S$5.3200
S$4.5200 / S$5.3200 Buy Now L4981AD013TR Part Details
L4981AD013TR DISTI # 2460846
STMicroelectronics PFC CONTROLLER, 100KHZ, 19.5V, SOIC-20 RoHS: Compliant Min Qty: 1 Container: Cut Tape L4981AD013TR Part Details 873
  • 500 S$4.5200
  • 200 S$5.0500
  • 50 S$5.3200
  • 10 S$6.1300
  • 1 S$7.2400
S$4.5200 / S$7.2400 Buy Now L4981AD013TR Part Details
L4981AD013TR DISTI # 2474077
STMicroelectronics PFC CONTROLLER, 100KHZ, 19.5V, SOIC-20 RoHS: Compliant Min Qty: 1000 Container: Reel L4981AD013TR Part Details 0
  • 3000 S$3.6600
  • 1000 S$3.7300
S$3.6600 / S$3.7300 Buy Now L4981AD013TR Part Details
Top of Page ↑

Chips Pulse Industry Limited  

Part # Manufacturer Description Stock Price Price Range Buy
L4981AD013TR
STMicroelectronics SOIC-20_300mil AC-DC Controllers & Regulators RoHS Purchase Online, Ship Immediately L4981AD013TR Part Details 27234
  • 1000 $0.9547
  • 500 $0.9830
  • 100 $1.0474
  • 30 $1.1924
$0.9547 / $1.1924 Buy Now L4981AD013TR Part Details
Top of Page ↑

CHIPMALL.COM LIMITED  

Part # Manufacturer Description Stock Price Price Range Buy
L4981AD013TR
STMicroelectronics IC PFC CTR AVER CURR 100KHZ 20SO L4981AD013TR Part Details 22695
  • 1 $1.6990
  • 10 $1.4520
  • 100 $1.1405
  • 500 $1.0704
  • 1000 $1.0396
$1.0396 / $1.6990 Buy Now L4981AD013TR Part Details

Associated Part Details

Most Popular Switching Regulator or Controllers

Most Popular Part Numbers