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Power Circuits / Switching Regulator or Controllers / UC3843BN
Datasheets
UC3843BN by:
STMicroelectronics
Freescale Semiconductor
Hongxing Electrical Ltd
Motorola Mobility LLC
Motorola Semiconductor Products
onsemi
Rochester Electronics LLC
SGS Thomson
STMicroelectronics
Not Found

Current Mode PWM

Part Details for UC3843BN by STMicroelectronics

Results Overview of UC3843BN by STMicroelectronics

Tip: Data for a part may vary between manufacturers. You can filter for manufacturers on the top of the page next to the part image and part number.

Applications Consumer Electronics Energy and Power Systems Renewable Energy

UC3843BN Information

UC3843BN by STMicroelectronics is a Switching Regulator or Controller.
Switching Regulator or Controllers are under the broader part category of Power Circuits.

A power circuit delivers electricity in order to operate a load for an electronic device. Power circuits include transformers, generators and switches. Read more about Power Circuits on our Power Circuits part category page.

Price & Stock for UC3843BN

Part # Distributor Description Stock Price Buy
DISTI # 51AC9705
Newark Pwm Cont, Current Mode, 500Khz, Minidip, Input Voltage:15V, Output Voltage:5V, Output Current:1A,... Supply Voltage Min:-, Supply Voltage Max:-, Controller Ic Case Style:Minidip, No. Of Pins:8Pins, Frequency:500Khz, Operating Rohs Compliant: Yes |Stmicroelectronics UC3843BN more RoHS: Compliant Min Qty: 1 Package Multiple: 1 Date Code: 1 Container: Bulk 167
  • 1 $0.8000
  • 10 $0.5020
  • 100 $0.4370
  • 500 $0.4190
  • 1,000 $0.4030
  • 2,500 $0.3860
  • 10,000 $0.3630
$0.3630 / $0.8000 Buy Now
DISTI # 497-6786-5-ND
DigiKey IC REG CTRLR BST/FLYBK 8-MINIDIP Min Qty: 1 Lead time: 14 Weeks Container: Tube 749
In Stock
  • 1 $0.8400
  • 10 $0.5970
  • 50 $0.5016
  • 100 $0.4719
  • 250 $0.4406
  • 500 $0.4218
  • 1,000 $0.4062
  • 2,500 $0.3898
  • 5,000 $0.3800
$0.3800 / $0.8400 Buy Now
DISTI # 511-UC3843BN
Mouser Electronics Switching Controllers 0.5mA Current Mode RoHS: Compliant 3540
  • 1 $0.8400
  • 10 $0.5970
  • 25 $0.5020
  • 100 $0.4720
  • 250 $0.4410
  • 500 $0.4220
  • 4,000 $0.3800
  • 8,000 $0.3550
$0.3550 / $0.8400 Buy Now
DISTI # V36:1790_06568300
Arrow Electronics Current Mode PWM Controller 1A 500kHz 8-Pin PDIP Tube RoHS: Compliant Min Qty: 2000 Package Multiple: 2000 Lead time: 14 Weeks Date Code: 2429 Americas - 8000
  • 2,000 $0.3809
  • 4,000 $0.3247
$0.3247 / $0.3809 Buy Now
STMicroelectronics Current Mode PWM RoHS: Compliant Min Qty: 1 3531
  • 1 $0.8200
  • 10 $0.5900
  • 25 $0.4900
  • 100 $0.4600
  • 250 $0.4300
  • 500 $0.4100
$0.4100 / $0.8200 Buy Now
Future Electronics UC3843B Series 30 V 17 mA High Performance Current Mode PWM Controller - DIP-8 RoHS: Compliant pbFree: Yes Min Qty: 1 Package Multiple: 1 Lead time: 14 Weeks Container: Tube 4
Tube
  • 1 $0.3700
  • 100 $0.3600
  • 300 $0.3500
  • 1,250 $0.3450
  • 4,000 $0.3250
$0.3250 / $0.3700 Buy Now
Future Electronics UC3843B Series 30 V 17 mA High Performance Current Mode PWM Controller - DIP-8 RoHS: Compliant pbFree: Yes Min Qty: 4000 Package Multiple: 50 Lead time: 14 Weeks Container: Tube 0
Tube
  • 50 $0.3650
  • 250 $0.3550
  • 1,000 $0.3450
  • 2,500 $0.3400
  • 6,250 $0.3250
$0.3250 / $0.3650 Buy Now
Future Electronics UC3843B Series 30 V 17 mA High Performance Current Mode PWM Controller - DIP-8 RoHS: Compliant pbFree: Yes Min Qty: 4000 Package Multiple: 50 Lead time: 14 Weeks Container: Tube 0
Tube
  • 50 $0.3650
  • 250 $0.3550
  • 1,000 $0.3450
  • 2,500 $0.3400
  • 6,250 $0.3250
$0.3250 / $0.3650 Buy Now
DISTI # 86926248
Verical Current Mode PWM Controller 1A 500kHz 8-Pin PDIP Tube RoHS: Compliant Min Qty: 2000 Package Multiple: 2000 Date Code: 2429 Americas - 8000
  • 2,000 $0.3809
  • 4,000 $0.3247
$0.3247 / $0.3809 Buy Now
Quest Components IC,SMPS CONTROLLER,CURRENT-MODE,BIPOLAR,DIP,8PIN,PLASTIC 50
  • 1 $0.8100
  • 7 $0.6750
  • 23 $0.4860
$0.4860 / $0.8100 Buy Now
DISTI # UC3843BN
TME IC: PMIC, PWM controller, 1A, 48÷500kHz, Ch: 1, MiniDIP8, 0÷96%, tube Min Qty: 1 1422
  • 1 $0.7790
  • 10 $0.6940
  • 50 $0.6350
  • 100 $0.5440
  • 250 $0.5120
  • 500 $0.4600
  • 1,000 $0.3580
  • 4,000 $0.3350
$0.3350 / $0.7790 Buy Now
ComSIT USA AVAILABLE EU 1063
RFQ
ComSIT USA HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER Switching Controller, Current-mode, 1A, 500kHz Switchin... g Freq-Max, BIPolar, PDIP8 more RoHS: Not Compliant ECCN: EAR99 Stock DE - 400
Stock ES - 100
Stock US - 0
Stock MX - 0
Stock CN - 0
Stock HK - 0
RFQ
DISTI # UC3843BN
IBS Electronics SWITCHING CONTROLLER CURRENT-MODE 1A 500KHZ SWITCHING FREQ-MAX BIPOLAR PDIP8 Min Qty: 150 Package Multiple: 1 570
  • 150 $0.2460
  • 250 $0.2381
  • 1,250 $0.2314
  • 3,750 $0.2274
  • 10,000 $0.2195
$0.2195 / $0.2460 Buy Now
DISTI # SMC-UC3843BN
Sensible Micro Corporation AS6081 Certified Vendor, 1 Yr Warranty RoHS: Not Compliant Min Qty: 25 Lead time: 2 Weeks, 0 Days 4602
RFQ
DISTI # UC3843BN
Avnet Silica Current Mode PWM Controller 1A 8Pin PDIP (Alt: UC3843BN) RoHS: Compliant Min Qty: 50 Package Multiple: 50 Lead time: 15 Weeks, 0 Days Silica - 8600
Buy Now
Chip-Germany GmbH   RoHS: Not Compliant 1120
RFQ
Component Electronics, Inc IN STOCK SHIP TODAY 277
  • 1 $0.9200
  • 100 $0.6900
  • 1,000 $0.6000
$0.6000 / $0.9200 Buy Now
DISTI # UC3843BN
EBV Elektronik Current Mode PWM Controller 1A 8Pin PDIP (Alt: UC3843BN) RoHS: Compliant Min Qty: 50 Package Multiple: 50 Lead time: 15 Weeks, 0 Days EBV - 5900
Buy Now
LCSC 500kHz 7.6V30V DIP-8 AC-DC Controllers and Regulators ROHS 750
  • 5 $0.2768
  • 50 $0.2146
  • 150 $0.1879
  • 500 $0.1546
  • 2,000 $0.1398
  • 5,000 $0.1309
$0.1309 / $0.2768 Buy Now
Win Source Electronics IC REG CTRLR BST/FLYBK 8-MINIDIP 69680
  • 315 $0.1593
  • 675 $0.1491
  • 1,045 $0.1439
  • 1,500 $0.1337
  • 1,950 $0.1285
  • 2,435 $0.1234
$0.1234 / $0.1593 Buy Now

Part Details for UC3843BN

UC3843BN CAD Models

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UC3843BN Part Data Attributes

Parametric Data
UC3843BN STMicroelectronics
Buy Now Datasheet
Compare Parts:
UC3843BN STMicroelectronics Current Mode PWM
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Rohs Code Yes
Part Life Cycle Code Active
Ihs Manufacturer STMICROELECTRONICS
Part Package Code DIP
Package Description MINI, DIP-8
Pin Count 8
Reach Compliance Code compliant
ECCN Code EAR99
HTS Code 8542.39.00.01
Factory Lead Time 14 Weeks
Samacsys Manufacturer STMicroelectronics
Analog IC - Other Type SWITCHING CONTROLLER
Control Mode CURRENT-MODE
Control Technique PULSE WIDTH MODULATION
Input Voltage-Max 30 V
Input Voltage-Min 8.2 V
Input Voltage-Nom 15 V
JESD-30 Code R-PDIP-T8
JESD-609 Code e3
Number of Functions 1
Number of Terminals 8
Operating Temperature-Max 70 °C
Operating Temperature-Min
Output Current-Max 1 A
Package Body Material PLASTIC/EPOXY
Package Code DIP
Package Equivalence Code DIP8,.3
Package Shape RECTANGULAR
Package Style IN-LINE
Peak Reflow Temperature (Cel) NOT SPECIFIED
Qualification Status Not Qualified
Seated Height-Max 5.08 mm
Surface Mount NO
Switcher Configuration SINGLE
Switching Frequency-Max 500 kHz
Technology BIPOLAR
Temperature Grade COMMERCIAL
Terminal Finish Matte Tin (Sn)
Terminal Form THROUGH-HOLE
Terminal Pitch 2.54 mm
Terminal Position DUAL
Time@Peak Reflow Temperature-Max (s) NOT SPECIFIED
Width 7.62 mm

Alternate Parts for UC3843BN

This table gives cross-reference parts and alternative options found for UC3843BN. The Form Fit Function (FFF) tab will give you the options that are more likely to serve as direct pin-to-pin alternates or drop-in parts. The Functional Equivalents tab will give you options that are likely to match the same function of UC3843BN, but it may not fit your design. Always verify details of parts you are evaluating, as these parts are offered as suggestions for what you are looking for and are not guaranteed.

Part Number Manufacturer Composite Price Description Compare
UC3843BNG Rochester Electronics LLC Check for Price 1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDIP8, HALOGEN AND LEAD FREE, PLASTIC, DIP-8 UC3843BN vs UC3843BNG
UC3843N Rochester Electronics LLC Check for Price 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP8, GREEN, PLASTIC, DIP-8 UC3843BN vs UC3843N
UC3843N Fairchild Semiconductor Corporation Check for Price Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDIP8, DIP-8 UC3843BN vs UC3843N
UC3843BN onsemi Check for Price 1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDIP8, PLASTIC, DIP-8 UC3843BN vs UC3843BN
UC3843N STMicroelectronics Check for Price 1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDIP8, 0.300 INCH, MINI, DIP-8 UC3843BN vs UC3843N
UC3843J Rochester Electronics LLC Check for Price 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, CDIP8 UC3843BN vs UC3843J
Part Number Manufacturer Composite Price Description Compare
UC2842AD Unitrode Corporation Check for Price Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO14, SOIC-14 UC3843BN vs UC2842AD
LT1242CS8#PBF Linear Technology Check for Price LT1242 - High Speed Current Mode Pulse Width Modulators; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C UC3843BN vs LT1242CS8#PBF
UC3845ADTRG4 Texas Instruments Check for Price 30V,1A, 500KHz current mode PWM controller with 8.4V/7.6V UVLO 50% duty cycle, 0°C to 70°C 14-SOIC 0 to 70 UC3843BN vs UC3845ADTRG4
UC3842BVD1R2 onsemi Check for Price 1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO8, PLASTIC, SOIC-8 UC3843BN vs UC3842BVD1R2
UC3842DTR Unitrode Corporation Check for Price Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO14, UC3843BN vs UC3842DTR
UC2845N Texas Instruments $0.7890 Single ended 500KHz current mode PWM controller with 8.4V/7.6V UVLO 50% duty cycle, -40C to 85C 8-PDIP -40 to 85 UC3843BN vs UC2845N
UC3842ADWTRG4 Texas Instruments Check for Price 1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO16, GREEN, PLASTIC, SOIC-16 UC3843BN vs UC3842ADWTRG4
UC2845N onsemi Check for Price 1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDIP8, PLASTIC, DIP-8 UC3843BN vs UC2845N
MIC38HC45-1YM Microchip Technology Inc $3.4050 IC,SMPS CONTROLLER,CURRENT-MODE,BICMOS,SOP,14PIN,PLASTIC UC3843BN vs MIC38HC45-1YM
UC3844D8 Texas Instruments $0.7465 Single ended 500KHz current mode PWM controller with 16V/10V UVLO 50% duty cycle, 0C to 70C 8-SOIC 0 to 70 UC3843BN vs UC3844D8

UC3843BN Related Parts

UC3843BN Frequently Asked Questions (FAQ)

  • The maximum operating frequency of UC3843BN is 500 kHz. However, it's recommended to operate it at a frequency between 100 kHz to 400 kHz for optimal performance.

  • The values of RT and CT depend on the desired oscillator frequency and the specific application. A good starting point is to use the values recommended in the datasheet (RT = 10 kΩ, CT = 3.3 nF) and then adjust them based on the actual circuit performance.

  • The soft-start pin (SS) is used to gradually increase the output voltage during startup, reducing inrush currents and electromagnetic interference (EMI). Connect a capacitor (typically 10 nF to 100 nF) from the SS pin to ground and a resistor (typically 1 kΩ to 10 kΩ) from the SS pin to the output voltage.

  • To ensure stability, follow the layout guidelines in the datasheet, use a low-ESR output capacitor, and add a small capacitor (typically 10 nF to 100 nF) between the output and ground. Also, ensure that the input voltage is well-regulated and the output voltage is properly filtered.

  • The UC3843BN is designed to handle output currents up to 1.5 A. However, the actual output current capability depends on the specific application, PCB layout, and thermal management.