UC3845BN STMicroelectronics Integrated Circuit (Dual-In-Line Packages) In Stock

Name: UC3845BN
Brand: STMicroelectronics
SKU: UC3845BN
Availability: InStock

UC3845BN is a current-mode PWM controller IC by STMicroelectronics. Key specs include 8.2 V to 30 V input range, 500 kHz max oscillator frequency, and DIP-8 package. Available from stock with worldwide shipping.

ACTIVEIntegrated CircuitVerified May 2026

Package / Visual Reference

UC3845BNDual-In-Line Packages

Quick Facts

Manufacturer: STMicroelectronics
Package: Dual-In-Line Packages
Pin Count: 8
Lifecycle: ACTIVE
Datasheet: UC3845BN Datasheet PDF
Category: Integrated Circuit
Price: From $0.2847(MOQ 1)
Temp Range: ?°C to 70.0°C
RoHS: Compliant
Lead Time: 3–7 business days
Shipping: DHL Express · Worldwide

What are the key features of UC3845BN?

Current-mode control with cycle-by-cycle overcurrent limiting for superior transient response
Wide input voltage range of 8.2 V to 30 V suits diverse power-supply topologies
On-chip 5 V reference with 1% accuracy reduces external component count

What is UC3845BN used for?

UC3845BN is widely used in flyback, forward, and boost switch-mode power supplies for industrial and telecom equipment. Its current-mode PWM architecture enables precise output regulation and fast fault response in AC-DC and DC-DC converter designs. The device is also popular in battery chargers and motor drive auxiliary power stages requiring compact DIP-8 footprints.

What are the specifications of UC3845BN?

Factory Lead Time	14Weeks
YTEOL	6
Analog IC - Other Type	SWITCHING CONTROLLER
Control Mode	CURRENT-MODE
Control Technique	PULSE WIDTH MODULATION
Input Voltage-Max	30V
Input Voltage-Min	8.2V
Input Voltage-Nom	15V
JESD-30 Code	R-PDIP-T8
JESD-609 Code	e3
Number of Functions	1
Output Current-Max	1A
Package Body Material	PLASTIC/EPOXY
Package Equivalence Code	DIP8,.3
Package Shape	RECTANGULAR
Package Style	IN-LINE
Qualification Status	Not Qualified
Surface Mount	NO
Switcher Configuration	SINGLE
Switching Frequency-Max	500kHz
Technology	BIPOLAR
Temperature Grade	COMMERCIAL
Terminal Finish	Matte Tin (Sn)
Terminal Form	THROUGH-HOLE
Terminal Pitch	2.54mm
Terminal Position	DUAL
## UC3845BN Alternates Showing results	Image
Package	Dual-In-Line Packages

Compliance & Regulatory

RoHS Status	Compliant
Lead-Free	Yes (Pb-Free)
ECCN	EAR99
HTS Code	8542.39.00.60
Country of Origin	Mainland China

Where can I find the UC3845BN datasheet?

UC3845BN Datasheet Download

Official datasheet from STMicroelectronics

What are equivalent replacements for UC3845BN?

Compatible alternatives and drop-in replacements for UC3845BN:

UC2845BNSTMicroelectronics

Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDIP8

suggested

suggested

suggested

suggested

suggested

suggested

E-UC3845BNSTMicroelectronics

Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, PDIP8

View Part →

Compare all alternatives & request quotes →

Frequently Asked Questions

What input voltage range does UC3845BN support, and how does it affect power-supply design flexibility?

UC3845BN operates from 8.2 V to 30 V input, allowing it to be powered directly from a rectified auxiliary winding. This wide 8.2 V to 30 V range eliminates the need for a separate pre-regulator in most offline and telecom converter designs.

At what maximum switching frequency can UC3845BN operate, and what sets the oscillator?

The oscillator frequency can be programmed up to 500 kHz using an external resistor-capacitor network connected to the RT and CT pins. Higher frequencies above 200 kHz reduce transformer size, but switching losses must be balanced in the PCB layout.

Which converter topologies are best served by the UC3845BN current-mode control architecture?

Current-mode control in UC3845BN makes it ideal for flyback, forward, and boost converters where cycle-by-cycle peak current limiting is required. The 8-pin DIP-8 package suits single-ended topologies delivering up to approximately 100 W in offline applications.

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AvailabilityIn Stock

Reference Price (USD)

From $0.2847

Buy from 1pc · Factory-direct pricing

Qty.	Unit Price	Ext. Price
1+	$0.3440	$0.34
1000+	$0.2948	$294.80
2000+	$0.2912	$582.40
4000+	$0.2847	$1138.80

pcs

Unit price: $0.3440 · Total: $0.34

In Stock · 24h Response · Worldwide Shipping

Direct Contact

WhatsApp Inquiry Email RFQ

Lead Time3-7 business days

MOQFrom 1 piece

ShippingDHL / FedEx / UPS

OriginChina (Authorized)

Response within 24 hours · Worldwide shipping

“FindMyChip sourced our entire STM32 BOM in 48 hours when our usual distributor had 16-week lead times.”

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UC3845BN STMicroelectronics Integrated Circuit (Dual-In-Line Packages) In Stock

What are the key features of UC3845BN?

What is UC3845BN used for?

What are the specifications of UC3845BN?

Compliance & Regulatory

Where can I find the UC3845BN datasheet?

What are equivalent replacements for UC3845BN?

Frequently Asked Questions

What input voltage range does UC3845BN support, and how does it affect power-supply design flexibility?

At what maximum switching frequency can UC3845BN operate, and what sets the oscillator?

Which converter topologies are best served by the UC3845BN current-mode control architecture?

Related Guides

CSD87313DMS Synchronous Buck Power Stage Design Guide

STEF05SGR eFuse Selection Guide for 5 V Overcurrent Protection

C0402C103K3RACTU Selection Guide: Choosing a 10 nF 0402 MLCC

STM32H753VIT6 MCU Selection Guide: Memory, Package, Connectivity, and Security

Why Buy from FindMyChip

About STMicroelectronics

More from STMicroelectronics

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