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Texas Instruments UC2845AD8TR — Memory (DRAM / SRAM / Flash / EEPROM)

Texas Instruments UC2845AD8TR PWM Controller, 8-SOIC, Active

MPNUC2845AD8TR
End of Life

Texas Instruments UCx84xA series PWM controller, UC2845AD8TR, 8-SOIC surface mount, 7.6V–30V supply, -40°C to 85°C, 11 mA supply current, ROHS3 compliant.

$1.17Ref. price · indicative, final on quote
Texas Instruments UC2845AD8TR datasheet (PDF)
Packaging8-SOIC (0.154", 3.90mm Width)
RoHSROHS3 Compliant
SeriesUCx84xA
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

UC2845AD8TR specifications
ParameterValue
SeriesUCx84xA
MountingSurface Mount
Voltage - input-0.3V ~ 6.3V
Supply voltage7.6V ~ 30V
Current - supply11 mA
Operating temperature-40°C ~ 85°C (TA)
PackageTape & Reel (TR); Cut Tape (CT)
ApplicationsPWM Controller
Case8-SOIC (0.154\", 3.90mm Width)

Product details

Active production — no end-of-life watch needed

The UC2845AD8TR: ROHS3 compliance is confirmed, so the part passes EU material-restriction requirements without an exemption expiry to track.

PWM controller with multi-topology flexibility

The UC2845AD8TR is a current-mode PWM controller from the UCx84xA family, supporting multiple converter topologies — flyback, boost, forward, and isolated designs — making it a general-purpose choice for off-line and DC-DC power supplies. Its supply range of 7.6 V to 30 V covers the common bias rails in industrial and telecom equipment, while the 11 mA typical supply current keeps the controller's own draw low enough for auxiliary-winding or bootstrap startup circuits.

Frequently asked questions

What is the difference between UC2845 and UC2844?

The UC2845 and UC2844 differ in the UVLO (undervoltage lockout) thresholds and the maximum duty cycle. The UC2845 typically has a lower startup threshold and a duty cycle limit near 50%, while the UC2844 operates with a higher startup voltage and a duty cycle near 100%. Both share the same pinout and package options in the UCx84xA family.

What is the maximum switching frequency of UC2845?

The UC2845 is a current-mode PWM controller whose maximum switching frequency is set by the timing resistor and capacitor on the RT/CT pin. The datasheet typical range extends to 500 kHz, though practical frequency depends on the external component values and the propagation delay of the internal comparator.

Does UC2845AD8TR have overcurrent protection?

Yes — as a current-mode PWM controller, the UC2845AD8TR senses the primary-side current through an external sense resistor and compares it to an internal reference. Cycle-by-cycle current limiting is inherent to the architecture, providing pulse-by-pulse overcurrent protection without additional external circuitry.