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UC3844AD8TRG4

UC3844AD8TRG4 PWM Controller, 48% Duty Cycle, Up to 500 kHz

MPNUC3844AD8TRG4
Obsolete

Texas Instruments UC3844AD8TRG4 current-mode PWM controller, 8-SOIC, 48% max duty cycle, switching frequency up to 500 kHz, 10 V to 30 V supply, 0°C to 70°C operation.

Texas Instruments UC3844AD8TRG4 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

UC3844AD8TRG4 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)
PackageTape & Reel (TR)
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

Current-mode PWM controller for isolated supplies

The UC3844AD8TRG4: It delivers a single transistor-driver output with a maximum duty cycle of 48%, making it suited for single-ended topologies where the off-time must exceed the on-time to reset the transformer core. The switching frequency reaches up to 500 kHz, allowing smaller magnetics at the cost of higher switching losses — a trade-off the designer budgets in the thermal analysis.

The controller operates from a 10 V to 30 V supply rail (Vcc/Vdd), which covers the standard bias voltages for off-line AC-DC auxiliary windings and telecom bus converters.

Availability is limited to independent-distributor surplus stock and broker-channel inventory.

Frequently asked questions

Is UC3844AD8TRG4 obsolete?

Yes, Texas Instruments has marked UC3844AD8TRG4 as obsolete. No last-time-buy window remains; supply is limited to surplus and broker-channel inventory.

What is the replacement for UC3844AD8TRG4?

No official successor is listed by Texas Instruments for this specific variant. For a current-production pin-compatible alternative, evaluate other members of the UC3844 family in the same 8-SOIC package — confirm the duty-cycle and frequency specs match your design.