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Unitrode UC28 Discrete Semiconductors Series

3 variants · Unitrode

About the Unitrode UC28 Discrete Semiconductors Series

The Unitrode UC28 Discrete Semiconductors Series series groups 3 related part numbers, each listed with full specifications, a datasheet where available, and an RFQ option. Every variant in the range shares a common clock sync of No, I/O channels of 1 and mounting of Surface Mount. Variants differ by case, control features and duty cycle, so you can match the exact case your application requires using the selection guide below. All listed Unitrode UC28 Discrete Semiconductors Series part numbers are active and orderable.

Select a variant by

Case
14-SOIC (0.154\", 3.90mm Width) · 16-SOIC (0.295\", 7.50mm Width) · 20-LCC (J-Lead)
Control features
Current Limit, Enable, Frequency Control, Ramp, Soft Start · Frequency Control
Duty cycle
80% · 96% · 97%
Frequency
340kHz ~ 460kHz · Up to 500kHz
Function
Step-Up · Step-Up, Step-Down, Step-Up/Step-Down
Operating temperature
-40°C ~ 85°C (TA) · -40°C ~ 125°C (TJ)
Output configuration
Positive · Positive, Isolation Capable
Topology
Boost · Boost, Buck, Buck-Boost, Flyback, Forward · Boost, Buck, Flyback, Forward

Shared specifications

Clock sync
No
I/O channels
1
Mounting
Surface Mount
Output phases
1
Output type
Transistor Driver
Package
Bulk
Synchronous rectifier
No

Variant comparison

ParameterUC2824DWTRUC2843AQUC2843DTR/80869
Case16-SOIC (0.295\", 7.50mm Width)20-LCC (J-Lead)14-SOIC (0.154\", 3.90mm Width)
Control featuresCurrent Limit, Enable, Frequency Control, Ramp, Soft StartFrequency ControlFrequency Control
Duty cycle80%96%97%
Frequency340kHz ~ 460kHzUp to 500kHzUp to 500kHz
FunctionStep-UpStep-Up, Step-Down, Step-Up/Step-DownStep-Up, Step-Down, Step-Up/Step-Down
Operating temperature-40°C ~ 85°C (TA)-40°C ~ 125°C (TJ)-40°C ~ 85°C (TA)
Output configurationPositivePositive, Isolation CapablePositive, Isolation Capable
TopologyBoostBoost, Buck, Flyback, ForwardBoost, Buck, Buck-Boost, Flyback, Forward

Request a quote on any Unitrode UC28 Discrete Semiconductors Series part number and we confirm price, availability and lead time per line — including end-of-life and allocation-constrained variants.

All variants