Skip to main content
Log in
STMicroelectronics UC2842BN — Analog & Data Acquisition

UC2842BN PWM Controller, Boost/Flyback, 96% Duty, 8-DIP

MPNUC2842BN
End of Life

STMicroelectronics UC2842BN current-mode PWM controller, boost/flyback topology, 96% max duty cycle, up to 500 kHz switching, 10-30V supply, through-hole 8-DIP, -25°C to 85°C.

$1.29Ref. price · indicative, final on quote
STMicroelectronics UC2842BN datasheet (PDF)
Packaging8-DIP (0.300", 7.62mm)
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

UC2842BN specifications
ParameterValue
Output typeTransistor Driver
MountingThrough Hole
Voltage - supply (Vcc (Vdd))10V ~ 30V
Frequency - switchingUp to 500kHz
I/O channels1
Output phases1
Duty cycle96%
Operating temperature-25°C ~ 85°C (TA)
PackageTube
FunctionStep-Up, Step-Up/Step-Down
TopologyBoost, Flyback
Clock syncNo
Case8-DIP (0.300\", 7.62mm)
Control featuresFrequency Control
Output configurationPositive, Isolation Capable
Synchronous rectifierNo

Product details

Current-mode PWM controller for boost and flyback converters

The STMicroelectronics UC2842BN is a current-mode PWM controller designed for boost and flyback converter topologies. It integrates a transistor driver output, frequency control, and positive output configuration capable of isolation.

Through-hole DIP package and temperature grade

Housed in an 8-pin DIP (0.300", 7.62 mm) through-hole package, the UC2842BN is suited for prototyping, low-volume builds, and designs where wave soldering or hand assembly is preferred over SMT.

Active lifecycle — no immediate obsolescence risk

ROHS3 compliance covers current regulatory requirements for lead-free assembly.

Frequently asked questions

Can UC2842BN be used as a direct replacement for UC2843BN?

The UC2842BN and UC2843BN are pin-compatible current-mode PWM controllers. The key difference is the undervoltage lockout (UVLO) thresholds: the UC2842BN has a 16 V turn-on / 10 V turn-off threshold, while the UC2843BN uses 8.5 V / 7.6 V. They are not drop-in replacements without checking the supply rail and UVLO behavior in the existing design.

What is the maximum duty cycle of UC2842BN?

The UC2842BN supports a maximum duty cycle of 96%. This allows the controller to maintain regulation at high step-up ratios in boost and flyback topologies without pulse-skipping or mode hopping.