Fairchild Semiconductor FSQ321L
IC OFFLINE SWITCH FLYBACK 8LSOP
Answer first: this page is a purchasing reference for the exact part number FSQ321L from Fairchild Semiconductor. Use it to start datasheet, package, manufacturer and RFQ verification; do not treat page text as a live stock, price or lead-time promise.
Key Parameters
| Part Number | FSQ321L |
|---|---|
| Manufacturer | Fairchild Semiconductor |
| Category | AC DC Converters, Offline Switches |
| package | 8-SMD, Gull Wing |
| series | FPS™ |
| packaging | Bulk |
| product status | Active |
| param 1 | Isolated |
| param 2 | Yes |
| param 3 | 650V |
| param 4 | Flyback |
| param 5 | 12 V |
| param 6 | 8V ~ 20V |
| param 7 | - |
| param 8 | 55kHz ~ 67kHz |
| param 9 | 12 W |
| param 10 | Current Limiting, Over Load, Over Temperature, Over Voltage |
| param 11 | Sync |
| param 12 | -40°C ~ 85°C (TA) |
| param 13 | - |
| param 14 | - |
| param 15 | 8-LSOP |
| param 16 | Surface Mount |
Parameters are provided for purchasing review. Confirm package, suffix, lifecycle status, datasheet revision and approved substitutes before ordering.
How to Verify FSQ321L Before Ordering
Datasheet and parameter checks
- Confirm the full manufacturer part number, not only a shortened search keyword.
- Compare package, pinout, dimensions, voltage or rating fields, temperature range and compliance wording against the released BOM.
- Use the manufacturer datasheet or drawing for electrical and mechanical limits before approving a substitute.
RFQ fields SENICO needs
- Send exact part number, manufacturer, quantity, target delivery date, destination and required packaging.
- State whether alternates are allowed, and list any date-code, certificate, traceability or customer AVL requirement.
- Keep exact stock, factory lead time and proposed alternatives in separate quote lanes.
For FSQ321L, SENICO recommends checking manufacturer marking, package, date code, requested quantity, approved vendor requirements and replacement risk before issuing a purchase order. If a supplier suggests an equivalent, record the changed fields and approval owner before comparing price.
We do not treat displayed data as a real-time stock or price commitment. The RFQ reply is the verified commercial reference.
Related buying guides: stock and lead-time verification, equivalent IC comparison, and BOM RFQ preparation.