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Texas Instruments UC3846DWTR — Analog & Data Acquisition

UC3846DWTR PWM Controller, 500 kHz, 16-SOIC, Active

MPNUC3846DWTR
End of Life

Texas Instruments UC3846DWTR current-mode PWM controller, 500 kHz switching, 50% max duty cycle, 6.95 V to 40 V supply, 16-SOIC package, active production.

$3.82Ref. price · indicative, final on quote
Texas Instruments UC3846DWTR datasheet (PDF)
Packaging16-SOIC (0.295", 7.50mm Width)
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

UC3846DWTR specifications
ParameterValue
Output typeTransistor Driver
MountingSurface Mount
Voltage - supply (Vcc (Vdd))6.95V ~ 40V
Frequency - switching500kHz
I/O channels2
Output phases1
Duty cycle50%
Operating temperature0°C ~ 70°C (TA)
PackageTape & Reel (TR); Cut Tape (CT)
FunctionStep-Up, Step-Up/Step-Down
TopologyBoost, Flyback, Forward Converter, Half-Bridge, Push-Pull
Clock syncYes
Case16-SOIC (0.295\", 7.50mm Width)
Control featuresCurrent Limit, Enable, Frequency Control, Soft Start
Output configurationPositive
Synchronous rectifierYes

Product details

What this controller does and where it fits

The 0°C to 70°C operating range limits this part to commercial indoor equipment — bench supplies, telecom line cards in conditioned racks, appliance power stages. Not rated for automotive or outdoor enclosures without active cooling or a temperature-grade upgrade.

Sourcing and lifecycle — active, no LTB watch needed

The UC3846DWTR carries an active product status with ROHS3 compliance. No last-time-buy or obsolescence notice is in effect, so it can be specified into new production without a near-term requalification risk.

Frequently asked questions

Can UC3846DWTR be used for a flyback converter?

Yes — flyback is among its listed topologies. The 50% max duty cycle limits the step-up ratio, but for typical flyback applications (e.g., 24 V input to 5 V or 12 V output) it works well. The 500 kHz switching allows a small transformer.

What is the difference between UC3846 and UC3846DWTR?

The UC3846DWTR is the surface-mount 16-SOIC variant of the UC3846. The 'DWTR' suffix indicates the wide-body SOIC package and Tape & Reel shipping format. The controller core and ratings are identical.

What is UC3846DWTR used for?

It is a current-mode PWM controller for dc-dc converters in boost, flyback, forward, half-bridge, and push-pull topologies. Typical applications include telecom power modules, industrial brick converters, and bench power supplies operating in commercial temperature environments.