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Texas Instruments UC2845N — Discrete Semiconductors

Texas Instruments UC2845N PWM Controller, 8-DIP, 500kHz

MPNUC2845N
End of Life

Texas Instruments UC2845N current-mode PWM controller, 8-DIP (0.300", 7.62mm) through-hole package, Boost/Buck/Flyback/Forward topologies, up to 500kHz switching, 12V-28V supply, 48% max duty cycle, -40°C to 85°C.

$1.74Ref. price · indicative, final on quote
Texas Instruments UC2845N datasheet (PDF)
Packaging8-DIP (0.300", 7.62mm)
RoHSROHS3 Compliant
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

UC2845N specifications
ParameterValue
Output typeTransistor Driver
MountingThrough Hole
Voltage - supply (Vcc (Vdd))12V ~ 28V
FrequencyUp to 500kHz
I/O channels1
Output phases1
Duty cycle48%
Operating temperature-40°C ~ 85°C (TA)
PackageTube
FunctionStep-Up, Step-Down, Step-Up/Step-Down
TopologyBoost, Buck, Flyback, Forward
Clock syncNo
Case8-DIP (0.300\", 7.62mm)
Control featuresFrequency Control
Output configurationPositive, Isolation Capable
Synchronous rectifierNo

Product details

Multi-topology current-mode PWM controller

The Texas Instruments UC2845N is a current-mode PWM controller that supports Boost, Buck, Flyback, and Forward converter topologies — one part number covers isolated and non-isolated designs across a 12V to 28V supply range. The 48% maximum duty cycle sets a practical limit on step-down ratio in a single-switch Buck or Flyback; for higher ratios you'd cascade stages or move to a controller with >50% duty. The 500 kHz switching ceiling lets you shrink magnetics, but the trade-off is tighter layout to keep switching-node ringing under control.

Through-hole package and temperature grade

Housed in an 8-pin DIP (0.300", 7.62mm) through-hole package, the UC2845N is a hand-solderable part suited for prototyping, low-volume production, or rework — no hot-air profile needed. The single transistor-driver output drives an external MOSFET or IGBT directly; with the output configured for positive, isolation-capable drive, it pairs naturally with a pulse transformer for galvanically isolated gate drive in Flyback or Forward converters.

Frequently asked questions

What is the closest functional second-source to UC2845N — UCC2806DWTR?

The UCC2806DWTR is a dual-output current-mode controller with 50% duty cycle and synchronous rectifier capability, but it is a surface-mount SOIC part with a different pinout and dual outputs. The UC2845N is a single-output through-hole DIP-8 — they are not drop-in replacements. A board redesign would be required to swap between them.

What topologies does UC2845N support?

The UC2845N supports Boost, Buck, Flyback, and Forward converter topologies with a single transistor-driver output. The output configuration is positive and isolation-capable, making it suitable for both non-isolated and isolated power supplies.