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Power Circuits / Switching Regulator or Controllers / UC3845BD1
Datasheets
UC3845BD1 by:
STMicroelectronics
Freescale Semiconductor
Motorola Mobility LLC
Motorola Semiconductor Products
onsemi
Rochester Electronics LLC
STMicroelectronics
Not Found

Current Mode PWM

Part Details for UC3845BD1 by STMicroelectronics

Results Overview of UC3845BD1 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

UC3845BD1 Information

UC3845BD1 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 UC3845BD1

Part # Distributor Description Stock Price Buy
DISTI # 45AC7924
Newark Pwm Controller, 500Khz, 15V, Soic-8, Power Supply Controller Type:Single Ended Controller, No. Of ... Channels:1Channels, Control Mode:Current Mode Control, Supply Voltage Min:11V, Supply Voltage Max:30V, Ic Case/Package:Soic, Msl:- Rohs Compliant: Yes |Stmicroelectronics UC3845BD1 more RoHS: Compliant Min Qty: 1 Package Multiple: 1 Date Code: 0 Container: Bulk 20
  • 1 $1.0700
  • 10 $0.7350
  • 100 $0.6190
  • 500 $0.6040
  • 1,000 $0.5860
  • 2,500 $0.5010
  • 10,000 $0.4780
$0.4780 / $1.0700 Buy Now
DISTI # 497-18662-ND
DigiKey IC REG CTRLR BOOST/FLYBACK 8SO Min Qty: 1 Lead time: 14 Weeks Container: Tube 1985
In Stock
  • 1 $0.9600
  • 10 $0.6860
  • 25 $0.6192
  • 100 $0.5449
  • 300 $0.5036
  • 500 $0.4883
  • 1,000 $0.4707
  • 2,500 $0.4522
  • 5,000 $0.4410
$0.4410 / $0.9600 Buy Now
DISTI # 45AC7924
Avnet Americas Current Mode PWM Controller 1A 8-Pin SO N - Bulk (Alt: 45AC7924) RoHS: Compliant Min Qty: 1 Package Multiple: 1 Lead time: 16 Weeks, 4 Days Container: Bulk 20 Partner Stock
  • 1 $1.0000
  • 10 $0.6650
  • 100 $0.5490
  • 500 $0.5340
  • 1,000 $0.5160
$0.5160 / $1.0000 Buy Now
DISTI # UC3845BD1
Avnet Americas Current Mode PWM Controller 1A 8-Pin SO N - Rail/Tube (Alt: UC3845BD1) RoHS: Compliant Min Qty: 4000 Package Multiple: 2000 Lead time: 14 Weeks, 0 Days Container: Tube 0
  • 4,000 $0.2743
  • 8,000 $0.2726
  • 12,000 $0.2675
  • 20,000 $0.2627
  • 40,000 $0.2580
$0.2580 / $0.2743 Buy Now
DISTI # 511-UC3845BD1
Mouser Electronics Switching Controllers PWM CONTROLLER RoHS: Compliant 1690
  • 1 $0.9600
  • 10 $0.6860
  • 25 $0.6200
  • 100 $0.5450
  • 250 $0.5040
  • 500 $0.4890
  • 1,000 $0.4530
  • 4,000 $0.4300
  • 8,000 $0.4180
$0.4180 / $0.9600 Buy Now
STMicroelectronics Current Mode PWM RoHS: Compliant Min Qty: 1 1688
  • 1 $0.9400
  • 10 $0.6700
  • 25 $0.6100
  • 100 $0.5300
  • 250 $0.4900
  • 500 $0.4800
$0.4800 / $0.9400 Buy Now
Future Electronics UC3845B Series 30 V 500 kHz High Performance Current Mode PWM Controller-SO-8 RoHS: Compliant pbFree: Yes Min Qty: 2000 Package Multiple: 2000 Lead time: 14 Weeks Container: Tube 0
Tube
  • 2,000 $0.2900
  • 4,000 $0.2850
  • 10,000 $0.2800
$0.2800 / $0.2900 Buy Now
Quest Components SWITCHING CONTROLLER, CURRENT-MODE, 1A, 500KHZ SWITCHING FREQ-MAX, BIPOLAR, PDSO8 10
  • 1 $1.0464
  • 6 $0.8720
$0.8720 / $1.0464 Buy Now
DISTI # UC3845BD1
TME IC: PMIC, PWM controller, 1A, 48÷500kHz, Ch: 1, SO8, boost,flyback Min Qty: 1 1940
  • 1 $0.9520
  • 100 $0.6560
  • 300 $0.5520
  • 500 $0.5110
  • 1,000 $0.4620
  • 2,000 $0.4210
  • 2,500 $0.4090
  • 4,000 $0.3870
$0.3870 / $0.9520 Buy Now
Ameya Holding Limited IC: PMIC, PWM controller, 1A, 48÷500kHz, Channels: 1, SO8, 0÷48% 65
Buy Now RFQ
ComSIT USA HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER Switching Controller, Current-mode, 1A, 500kHz Switchin... g Freq-Max, BIPolar, PDSO8 more RoHS: Compliant ECCN: EAR99 Stock DE - 700
Stock ES - 300
Stock US - 0
Stock MX - 0
Stock CN - 0
Stock HK - 0
RFQ
DISTI # UC3845BD1
Avnet Silica Current Mode PWM Controller 1A 8Pin SO N (Alt: UC3845BD1) RoHS: Compliant Min Qty: 100 Package Multiple: 100 Lead time: 15 Weeks, 0 Days Silica - 6200
Buy Now
DISTI # UC3845BD1
EBV Elektronik Current Mode PWM Controller 1A 8Pin SO N (Alt: UC3845BD1) RoHS: Compliant Min Qty: 100 Package Multiple: 100 Lead time: 15 Weeks, 0 Days EBV - 3700
Buy Now

Part Details for UC3845BD1

UC3845BD1 CAD Models

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UC3845BD1 Part Data Attributes

Parametric Data
UC3845BD1 STMicroelectronics
Buy Now Datasheet
Compare Parts:
UC3845BD1 STMicroelectronics Current Mode PWM
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Rohs Code Yes
Part Life Cycle Code Active
Ihs Manufacturer STMICROELECTRONICS
Part Package Code SOIC
Package Description SO-8
Pin Count 8
Reach Compliance Code compliant
ECCN Code EAR99
HTS Code 8542.39.00.01
Factory Lead Time 16 Weeks, 4 Days
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-PDSO-G8
JESD-609 Code e4
Length 4.9 mm
Moisture Sensitivity Level 1
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 SOP
Package Equivalence Code SOP8,.25
Package Shape RECTANGULAR
Package Style SMALL OUTLINE
Peak Reflow Temperature (Cel) 260
Qualification Status Not Qualified
Seated Height-Max 1.75 mm
Surface Mount YES
Switcher Configuration SINGLE
Switching Frequency-Max 500 kHz
Technology BIPOLAR
Temperature Grade COMMERCIAL
Terminal Finish Nickel/Palladium/Gold (Ni/Pd/Au)
Terminal Form GULL WING
Terminal Pitch 1.27 mm
Terminal Position DUAL
Time@Peak Reflow Temperature-Max (s) 30
Width 3.9 mm

Alternate Parts for UC3845BD1

This table gives cross-reference parts and alternative options found for UC3845BD1. 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 UC3845BD1, 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
UC3845BD1013TR STMicroelectronics $0.2669 Current Mode PWM UC3845BD1 vs UC3845BD1013TR
UC2844BDR2G onsemi $0.4285 High Performance Current Mode PWM Controller, SOIC-14 NB, 2500-REEL UC3845BD1 vs UC2844BDR2G
UC2845BN STMicroelectronics $0.5825 Current Mode PWM UC3845BD1 vs UC2845BN
UC3844BVDR2G onsemi $0.4477 High Performance Current Mode PWM Controller, SOIC-14 NB, 2500-REEL UC3845BD1 vs UC3844BVDR2G
UC3844BVD1R2G onsemi $0.3605 High Performance Current Mode PWM Controller, SOIC-8 Narrow Body, 2500-REEL UC3845BD1 vs UC3844BVD1R2G
UC3844BDR2G onsemi $0.4697 High Performance Current Mode PWM Controller, SOIC-14 NB, 2500-REEL UC3845BD1 vs UC3844BDR2G
UC3844BVNG onsemi Check for Price High Performance Current Mode PWM Controller, 8 LEAD PDIP, 50-TUBE UC3845BD1 vs UC3844BVNG
E-UC3843BN STMicroelectronics Check for Price Current Mode PWM UC3845BD1 vs E-UC3843BN
UC3845BVDG onsemi Check for Price High Performance Current Mode PWM Controller, SOIC-14 NB, 55-TUBE UC3845BD1 vs UC3845BVDG
UC3845BVD1G onsemi Check for Price High Performance Current Mode PWM Controller, SOIC-8 Narrow Body, 98-TUBE UC3845BD1 vs UC3845BVD1G

UC3845BD1 Related Parts

UC3845BD1 Frequently Asked Questions (FAQ)

  • The recommended operating voltage range for UC3845BD1 is 12V to 28V, with a maximum rating of 30V.

  • The oscillator circuit requires two resistors, R1 and R2. Choose R1 to be around 1kΩ to 10kΩ, and R2 to be around 10kΩ to 100kΩ. The ratio of R1 to R2 determines the oscillator frequency.

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

  • The maximum duty cycle is set by the ratio of the resistors R3 and R4 in the feedback circuit. A higher ratio of R3 to R4 increases the maximum duty cycle.

  • The undervoltage lockout (UVLO) is a feature that prevents the IC from operating below a certain voltage threshold (typically around 8.5V). This is to prevent the IC from malfunctioning or drawing excessive current during startup or brownout conditions.