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Fairchild Semiconductor FMB857B

TRANS PNP 45V 0.5A SUPERSOT-6

Answer first: this page is a purchasing reference for the exact part number FMB857B 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.

Manufacturer: Fairchild Semiconductor Category: Single Bipolar Transistors Part number: FMB857B Package: SOT-23-6 Thin, TSOT-23-6 RFQ verification required

Key Parameters

Part NumberFMB857B
ManufacturerFairchild Semiconductor
CategorySingle Bipolar Transistors
packageSOT-23-6 Thin, TSOT-23-6
series-
packagingBulk
product statusObsolete
param 1PNP
param 2500 mA
param 345 V
param 4650mV @ 5mA, 100mA
param 515nA (ICBO)
param 6220 @ 2mA, 5V
param 7700 mW
param 8-
param 9-55°C ~ 150°C (TJ)
param 10-
param 11-
param 12Surface Mount
param 13SuperSOT™-6

Parameters are provided for purchasing review. Confirm package, suffix, lifecycle status, datasheet revision and approved substitutes before ordering.

How to Verify FMB857B 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 FMB857B, 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.