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BC857B-QR

Name: BC857B-QR
Rating: 4.7 (12 reviews)

TRANS PNP 45V 0.1A TO236AB

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製造商。部分 #BC857B-QR
包 TO-236-3, SC-59, SOT-23-3
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規格

Supplier	Nexperia USA Inc.
Package	Bulk
Series	Automotive, AEC-Q101
ProductStatus	Active
TransistorType	PNP
Current-Collector(Ic)(Max)	100 mA
Voltage-CollectorEmitterBreakdown(Max)	45 V
VceSaturation(Max)@IbIc	650mV @ 5mA, 100mA
Current-CollectorCutoff(Max)	15nA (ICBO)
DCCurrentGain(hFE)(Min)@IcVce	220 @ 2mA, 5V
Power-Max	250 mW
Frequency-Transition	100MHz
OperatingTemperature	150°C (TJ)
MountingType	Surface Mount
Package/Case	TO-236-3, SC-59, SOT-23-3

概述

Description

BC857B-QR is a PNP small-signal transistor from the BC857 family, intended for general-purpose amplification and switching in surface-mount designs (SOT-23 package; QR is a packaging/reel option).
Key specs (typical, varies by manufacturer):
- Vceo: up to 45 V
- Ic: up to 100 mA
- Vebo: up to 5 V
- hFE: ~200–450 (gain group B)
Notes:
- -QR indicates a specific packaging/reel variant; exact dimensions and pinout depend on the supplier. Always check the datasheet.
- Common uses: small-signal amplifier stages, level shifting, switching, biasing networks.
- Pinout (SOT-23) commonly E–B–C, but verify with the exact device.
If you need exact parameters for a design, pull the manufacturer’s datasheet for BC857B-QR from your chosen supplier.

Features

BC857B-QR is a general-purpose PNP transistor in a SOT-23 package (QR = tape/ reel).
Key features:
- Type: PNP general-purpose transistor
- Package: SOT-23, Tape-and-Reel (QR)
- Voltages: Vceo ≈ -45 V, Vcbo ≈ -50 V, VeBo ≈ -5 V
- Current: Ic max ≈ 100 mA
- Power: Pd ≈ 250 mW (at 25°C)
- Gain: hFE ≈ 110–800 (B grade; varies with Ic and temperature)
- Saturation: Vce(sat) typically ~0.2–0.4 V under moderate drive
- Complement: NPN BC847
- RoHS/Pb-free
These specs make BC857B-QR suitable for general switching and amplification tasks in low-power, space-constrained designs.

Package

The BC857B-QR is the SMD variant in a SOT-23 (SC-59) 3-pin surface-mount package, supplied on tape-and-reel.

Pinout

- Pin count: 3 pins (SOT-23 package).
- Function: PNP small‑signal bipolar junction transistor (general‑purpose switching and amplification).
- Typical SOT‑23 pinout (BC857B / BC857B-QR): Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector.
- Note: “-QR” is a manufacturer/packaging suffix (usually tape‑and‑reel).

Manufacturer

The BC857B-QR is a variant of the BC857B PNP transistor sold by multiple semiconductor manufacturers (examples: Nexperia, ON Semiconductor, Diodes Incorporated). These suppliers are semiconductor companies that design and manufacture discrete components (transistors, diodes), logic and analog ICs, and power-management devices. The “-QR” is typically a manufacturer/distributor packaging or ordering suffix (e.g., tape-and-reel / RoHS).

Application

BC857B-QR is a general-purpose PNP small-signal transistor (SMD QR package). Typical applications:
- High-side switching and current sinking in power/driver circuits
- Input/preamplifier stages and emitter-follower biasing in audio, sensor, and instrumentation circuits
- Level shifting and small-signal switching in digital/analog circuits
- General amplification in consumer electronics
Complementary to BC847B (NPN).

Equivalent

Direct equivalents: BC857B (same part from Nexperia, ON Semi, Diodes Inc.), BC557B (through‑hole equivalent). Common substitute PNPs with similar ratings: 2N3906 / PMBT3906 / PMMBT3906 and MMBT2907A (verify gains/IC/VCES). Always confirm pinout, hFE group and maximum ratings before replacing.