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STMicroelectronics UC3843AD1 — Power Management (PMIC / Gate Driver)

UC3843AD1 PWM Controller, Obsolete, Boost/Flyback, 500 kHz

MPNUC3843AD1
Obsolete

UC3843AD1, current-mode PWM controller, boost/flyback, up to 500 kHz switching, 96% duty cycle, 10-30 V supply, 0-70°C, 8-SOIC, tube.

$0.9700Ref. price · indicative, final on quote
STMicroelectronics UC3843AD1 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

UC3843AD1 specifications
ParameterValue
Output typeTransistor Driver
MountingSurface Mount
Voltage - supply (Vcc (Vdd))10V ~ 30V
Frequency - switchingUp to 500kHz
I/O channels1
Output phases1
Duty cycle96%
Operating temperature0°C ~ 70°C (TA)
PackageTube
FunctionStep-Up, Step-Up/Step-Down
TopologyBoost, Flyback
Clock syncNo
Case8-SOIC (0.154\", 3.90mm Width)
Control featuresFrequency Control
Output configurationPositive, Isolation Capable
Synchronous rectifierNo

Product details

It drives a single external transistor with a maximum duty cycle of 96% and switches at frequencies up to 500 kHz. The 10 V to 30 V supply range covers standard telecom and industrial bus voltages.

Housed in an 8-SOIC (0.154-inch body width) surface-mount package, the UC3843AD1 fits a standard SOIC-8 footprint.

The UC3843AD1 is officially obsolete. For production runs, this part must be sourced through independent distribution or the surplus market.

Sourcing the UC3843AD1 today

The UC3843 family in SOIC-8 is pin-compatible; verify the operating temperature grade matches your environment.

Frequently asked questions

Is UC3843AD1 obsolete?

Buyers need to confirm lifecycle status to avoid production disruptions or redesign.

What is a suitable replacement for UC3843AD1?

Engineers and sourcing buyers need an alternate part to continue designs or fill BOM lines.

Where can I buy UC3843AD1?

Sourcing buyers need to find available stock from authorized distributors.

What is the pinout of UC3843AD1?

Design engineers must validate pin compatibility with existing schematics.

What is the price of UC3843AD1?

Buyers need cost data for BOM estimation and budget approval.

Is UC3843AD1 compatible with UC3843?

Technicians and engineers need quick cross-reference confidence for drop-in replacement.