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STMicroelectronics UC3843BN — Power Management (PMIC / Gate Driver)

UC3843BN STMicroelectronics PWM Controller – Obsolete

MPNUC3843BN
Obsolete

STMicroelectronics UC3843BN, current-mode PWM controller, boost/flyback topology, 8-DIP package, switching frequency up to 500 kHz, max duty cycle 96%.

$0.9000Ref. price · indicative, final on quote
STMicroelectronics UC3843BN datasheet (PDF)
Packaging8-DIP (0.300", 7.62mm)
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

UC3843BN specifications
ParameterValue
Output typeTransistor Driver
MountingThrough Hole
Voltage - supply (Vcc (Vdd))7.6V ~ 30V
Frequency - switchingUp to 500kHz
I/O channels1
Output phases1
Duty cycle96%
Operating temperature0°C ~ 70°C (TJ)
PackageTube
FunctionStep-Up, Step-Up/Step-Down
TopologyBoost, Flyback
Clock syncNo
Case8-DIP (0.300\", 7.62mm)
Control featuresFrequency Control
Output configurationPositive, Isolation Capable
Synchronous rectifierNo

Product details

Boost and flyback controller – key ratings

The UC3843BN: The single transistor-driver output drives an external power switch, and the part includes frequency control for setting the oscillator. Switching frequency reaches up to 500 kHz, which lets the designer shrink the magnetic components — a practical advantage when board space is tight. The maximum duty cycle of 96% gives headroom for high step-up ratios or low-input-voltage operation without pulse skipping. Supply voltage range is 7.6 V to 30 V.

Package and mounting – through-hole 8-DIP

Housed in an 8-DIP (0.300-inch, 7.62 mm) package with through-hole mounting, the UC3843BN is straightforward to hand-assemble or rework.

Frequently asked questions

Is UC3843BN obsolete?

Buyers need to know lifecycle status to decide on design viability or sourcing for production.

What is the replacement for UC3843BN?

For existing designs or repairs, finding a drop-in or cross-reference is critical to avoid rework.

What is the pinout of UC3843BN?

Engineers validating board layout must confirm pin assignments for integration.

Where can I buy UC3843BN?

Sourcing agents need verified distributors with stock, especially for an obsolete part.

What is the price of UC3843BN?

Budgeting and cost comparison depend on current market pricing.