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Texas Instruments UC2843AQDRHT — Analog & Data Acquisition

UC2843AQDRHT PWM Controller, AEC-Q100, Up to 500 kHz

MPNUC2843AQDRHT
End of Life

Texas Instruments UC2843AQDRHT, Automotive AEC-Q100 current-mode PWM controller, up to 500 kHz switching, 96% max duty cycle, 7.6 V to 30 V supply, -40°C to 125°C, 14-SOIC package.

$1.31Ref. price · indicative, final on quote
Texas Instruments UC2843AQDRHT datasheet (PDF)
Packaging14-SOIC (0.154", 3.90mm Width)
RoHSNot applicable
SeriesAutomotive, AEC-Q100
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

UC2843AQDRHT specifications
ParameterValue
SeriesAutomotive, AEC-Q100
Output typeTransistor Driver
MountingSurface Mount
Voltage - supply (Vcc (Vdd))7.6V ~ 30V
Frequency - switchingUp to 500kHz
I/O channels1
Output phases1
Duty cycle96%
Operating temperature-40°C ~ 125°C (TA)
PackageBulk
FunctionStep-Up
TopologyBoost, Buck, Flyback, Forward
Clock syncNo
Case14-SOIC (0.154\", 3.90mm Width)
Control featuresFrequency Control
Output configurationPositive, Isolation Capable
Synchronous rectifierNo

Product details

Current-mode PWM controller for automotive and industrial power supplies

The Texas Instruments UC2843AQDRHT is a current-mode PWM controller designed for step-up (boost), buck, flyback, and forward converter topologies. It delivers a single transistor-driver output with a maximum duty cycle of 96%, allowing wide conversion ratios without pulse-skipping. The controller operates from a 7.6 V to 30 V supply and switches at frequencies up to 500 kHz, giving designers flexibility to shrink magnetics or optimize for efficiency.

The 96% maximum duty cycle allows the controller to keep the switch on for nearly the whole period. The 500 kHz upper switching frequency lets you use smaller magnetics and output capacitors.

Automotive-grade reliability with AEC-Q100

Frequently asked questions

What is the maximum switching frequency of UC2843AQDRHT?

The UC2843AQDRHT can switch at frequencies up to 500 kHz. This allows designers to use smaller magnetics and capacitors, though higher frequencies increase switching losses and require careful layout.

Can UC2843AQDRHT be used in flyback converters?

Yes, the UC2843AQDRHT supports flyback topology as one of its listed topologies (boost, buck, flyback, forward). The 96% maximum duty cycle is especially useful in flyback designs that need a wide input-to-output voltage ratio.

Does UC2843AQDRHT support clock sync?

No, the UC2843AQDRHT does not support clock synchronization. It is a free-running current-mode controller with frequency control via an external RC network.

What is the equivalent of UC2843AQDRHT?

The UC2843AQDRHT is a current-mode PWM controller in the UCx84x family. A functional peer is the UCC2806DWTR, which also supports boost, flyback, and forward topologies but has a 50% maximum duty cycle and two outputs, and operates over -40°C to 85°C — not the full automotive temperature range. The LM5150QURUMRQ1 is another automotive-grade (AEC-Q100) boost controller with clock sync and a 2.3 MHz switching frequency, but it is a different topology fit (boost only). Neither is a direct pin-compatible replacement; verify the pinout and control features for your design.