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UC3844AD8TR

UC3844AD8TR Current-Mode PWM Controller, 48% Duty Cycle

MPNUC3844AD8TR
Active

Texas Instruments UC3844AD8TR current-mode PWM controller, 48% max duty cycle, switching frequency up to 500 kHz, 10V to 30V supply, 8-SOIC package, commercial temperature range 0°C to 70°C.

$1.1200Ref. price · indicative, final on quote
Texas Instruments UC3844AD8TR datasheet (PDF)
Packaging8-SOIC (0.154", 3.90mm Width)
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

UC3844AD8TR 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); Cut Tape (CT)
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 flyback and forward converters

The UC3844AD8TR is a current-mode PWM controller for off-line and DC-to-DC converter applications. It supports boost, buck, flyback, and forward topologies, with a single transistor-driver output. Key parameters include a maximum duty cycle of 48%, switching frequency up to 500 kHz, and a supply range of 10V to 30V.

The UC3844AD8TR is an active, current-production part with no NRND or EOL flags. It is ROHS3 compliant. No last-time-buy risk for new designs.

Supplied in Tape & Reel (TR) or Cut Tape (CT) for the 8-SOIC package (body 3.90 mm width). The part is surface-mount, intended for automated assembly. No thermal pad — junction-to-ambient thermal resistance is managed through the SOIC's leads and PCB copper.

Frequently asked questions

What is the maximum duty cycle of UC3844AD8TR?

The maximum duty cycle is 48%. This is a fixed clamp — the part will not operate above this limit, which is intentional for flyback and forward converter designs requiring slope compensation.

What is the closest functional second-source to UC3844AD8TR?

The UCC2806DWTR is a peer with similar topology support (boost, flyback, forward) and a 50% duty cycle, but it has two outputs and a lower switching frequency of 47 kHz. It is not a pin-compatible drop-in; the different output count and frequency require a board redesign. For a direct functional match within the same family, the UC3844AD8TR itself is the standard choice.