Fairchild Semiconductor FSA859UCX
IC SWITCH SPDTX1 750MOHM 8WLCSP
Answer first: this page is a purchasing reference for the exact part number FSA859UCX 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 | FSA859UCX |
|---|---|
| Manufacturer | Fairchild Semiconductor |
| Category | Analog Switches, Multiplexers, Demultiplexers |
| package | 8-UFBGA, WLCSP |
| series | - |
| packaging | Bulk |
| product status | Obsolete |
| param 1 | SPDT |
| param 2 | 2:1 |
| param 3 | 1 |
| param 4 | 750mOhm |
| param 5 | - |
| param 6 | 1.65V ~ 5.5V |
| param 7 | - |
| param 8 | 25ns, 20ns |
| param 9 | 60MHz |
| param 10 | 70pC |
| param 11 | 50pF |
| param 12 | 10nA |
| param 13 | -55dB @ 1MHz |
| param 14 | -40°C ~ 85°C (TA) |
| param 15 | - |
| param 16 | - |
| param 17 | Surface Mount |
| param 18 | 8-WLCSP (1.91x0.91) |
Parameters are provided for purchasing review. Confirm package, suffix, lifecycle status, datasheet revision and approved substitutes before ordering.
How to Verify FSA859UCX 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 FSA859UCX, 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.