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UC3844AD8

UC3844AD8 Current-Mode PWM Controller – TI, 48% Duty

MPNUC3844AD8
Active

Texas Instruments UC3844AD8, current-mode PWM controller, 8-SOIC package, 48% max duty cycle, switching frequency up to 500 kHz, 10 V to 30 V supply.

$1.3300Ref. price · indicative, final on quote
Texas Instruments UC3844AD8 datasheet (PDF)
Packaging8-SOIC (0.154", 3.90mm Width)
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

UC3844AD8 specifications
ParameterValue
Output typeTransistor Driver
MountingSurface Mount
Voltage - supply (Vcc (Vdd))10V ~ 30V
Frequency - switchingUp to 500kHz
I/O channels1
Output phases1
Duty cycle48%
Operating temperature0°C~70°C(TA)
PackageTube
FunctionStep-Up, Step-Down, Step-Up/Step-Down
TopologyBoost, Buck, Flyback, Forward
Clock syncNo
Case8-SOIC (0.154\", 3.90mm Width)
Control featuresFrequency Control
Output configurationPositive, Isolation Capable
Synchronous rectifierNo

Product details

48% duty-cycle ceiling — topology gate

The UC3844AD8 is a current-mode PWM controller with a maximum duty cycle of 48%. That hard cap means it is suited for single-switch flyback and forward converters where the duty cycle stays below 50% — prevents transformer saturation in continuous-conduction mode without slope compensation. Switching frequency reaches up to 500 kHz, which lets the design shrink the transformer and output filter inductance compared to 100 kHz-class controllers. The trade-off: gate-drive losses and snubber dissipation scale with frequency, so the thermal budget on the 8-SOIC package needs a check at the upper end.

Active lifecycle — no obsolescence watch

Package is 8-SOIC, supplied in tube.

Frequently asked questions

Is UC3844AD8 the same as the standard UC3844?

The UC3844AD8 is the 8-SOIC surface-mount variant of the UC3844. The base part number UC3844 covers both DIP-8 and SOIC-8 packages. The 'A' suffix indicates a tighter tolerance on the oscillator frequency and the 'D8' suffix denotes the 8-SOIC package. Electrical specifications — 48% max duty cycle, 500 kHz switching, 10 V to 30 V supply — are identical to the standard UC3844.