onsemi UC3843BD
UC3843BD variants from onsemi
UC3843BD Overview
What changes between part numbers, and what to check before you lock the BOM — Microcontrollers.
UC3843BD is a onsemi order-code family — not a single orderable MPN. This page lists 3 variants that share the same core device but differ in suffix fields (package, grade, reel/tube, electrical bin, etc.). Pick the exact full part number; substituting within the family without checking the datasheet often causes assembly or spec mismatches.
1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO14, PLASTIC, SOIC-14 Other listed variants describe: 1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO8, PLASTIC, SOIC-8; PWM Controller, DC/DC, Current Mode, SOIC-8, 52kHz, 30V.
Suffix examples in this family: 1, 1R2G. The characters after the base number usually encode package, temperature, or performance grade — compare the variant table column-by-column rather than assuming pin-compatible drops-in.
Example MPNs: UC3843BD, UC3843BD1, UC3843BD1R2G.
Key Features
- Lifecycle mix: ActiveConfirm lifecycle on the exact MPN, not just the base number prefix.
- 2 distinct suffix patternsExamples: 1, 1R2G. Decode suffix meaning in the ordering notes under the variant table.
Target Applications
- Microcontrollers — design-in and field replacement
- BOM scrub where only the base prefix is known but suffix is TBD
- Second-source checks when the original MPN is constrained
Ordering Variants
Compare 3 UC3843BD part numbers by package, electrical parameters, lifecycle, and availability. Use RFQ for stock and lead-time confirmation.
| Part Number | Description | Manufacturer | Lifecycle | RoHS | Availability | Action |
|---|---|---|---|---|---|---|
| UC3843BD | 1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO14, PLASTIC, SOIC-14 | onsemi | Active | Compliant | In Stock | |
| UC3843BD1 | 1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO8, PLASTIC, SOIC-8 | onsemi | Active | Compliant | In Stock | |
| UC3843BD1R2G | PWM Controller, DC/DC, Current Mode, SOIC-8, 52kHz, 30V | onsemi | Active | Compliant | In Stock |
Ordering Code Differences
How suffixes on UC3843BD map to package, grade, and reel options.
UC3843BD uses a shared prefix; characters after the prefix encode orderable options. Two lines with the same prefix are not drop-in replacements unless the differing columns match your need.
Suffixes seen here: 1, 1R2G.
Full MPN examples: UC3843BD1, UC3843BD1R2G.
Tip: photograph or copy the reel label — reel diameter, QTY per reel, and moisture sensitivity level (MSL) are often suffix-driven and won't show in the schematic.
How to Choose the Right UC3843BD Microcontrollers
Match the footprint first
Pull the exact package drawing for your MPN — base-number swaps fail most often at the footprint, not the schematic.
Electrical headroom
Compare voltage and current columns in the variant table. For UC3843BD, a suffix with lower voltage or current rating will not survive the same circuit without recalculation.
Temp grade letter matters
Commercial (0–70 °C) and industrial (−40–85 °C+) suffixes look similar in the prefix — confirm ambient + self-heating, not just the first page of the datasheet.
Copy the full MPN
Do not BOM only "UC3843BD" — include the full suffix (e.g. 1, 1R2G). RFQ with reel/tube preference and required date code.
Technical Specifications
Core parameters for UC3843BD product family
Identity
Variant Parameters
Source UC3843BD with Octatronics
Request stock confirmation, lead time, date code, and pricing for all 3 ordering variants from onsemi. Our team supports active, EOL, and hard-to-find component sourcing.
- Original manufacturer parts with traceability options
- BOM upload and multi-line RFQ support
- Package, grade, and compliance verification
Frequently Asked Questions
Common technical questions about the UC3843BD product family.