BC857B-QR

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BC857B-QR

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TRANS PNP 45V 0.1A TO236AB

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Especificações

Atributo Valor
Supplier Nexperia USA Inc.
Package / Case Bulk
Series Automotive, AEC-Q101
Part Status Active
Transistor Type PNP
Current - Collector(Ic)(Max) 100 mA
Voltage - Collector Emitter Breakdown(Max) 45 V
Vce Saturation(Max) @ Ib Ic 650mV @ 5mA, 100mA
Current - Collector Cutoff(Max) 15nA (ICBO)
DC Current Gain(h FE)(Min) @ Ic Vce 220 @ 2mA, 5V
Power - Max 250 mW
Frequency - Transition 100MHz
Operating Temperature 150°C (TJ)
Mounting Type Surface Mount

Visão Geral

Description

BC857B-QR is a PNP general-purpose small-signal transistor from the BC857 family (complement to BC847). It’s intended for low-power switching and amplification in SMD designs.
Key points
- Type: PNP bipolar transistor
- Package: SOT-23, reel packaging (QR denotes tape-and-reel)
- VCEO: about -45 V
- IC (max): up to -100 mA
- Power: ~200 mW in SOT-23
- DC current gain (hFE) grade B: roughly 200–450 (typical varies with Ic and temperature)
- Applications: signal switching, preamplification, biasing in small-signal circuits
Use when you need a complementary pair with BC847 for NPN applications, or any low-power PNP switch/amplifier in compact, surface-mount designs.

Equivalent

BC857B-QR is a PNP general‑purpose transistor (≈45 V, ≈100 mA). Common equivalents:
- BC857B/BC856B/BC857A/C from other vendors (same BC857 family, different gain).
- MMBT3906 / PMBT3906 / MMBT3906W (SMD PNP, 40 V, ~200 mA) – cross references.
- 2N3906 (TO‑92 through‑hole) – same device family.

Features

BC857B-QR features (general-purpose PNP transistor in SOT-23, -QR tape & reel):
- Type: PNP, general purpose small-signal transistor
- Package: SOT-23, -QR (Tape & Reel)
- Vceo: 45 V
- Ic max: 100 mA
- DC gain (hFE): ~200–450 (BC857B range)
- Power rating: ~225 mW
- Operating temp: -55°C to +150°C
- Pinout (SOT-23): 1 = Emitter, 2 = Base, 3 = Collector
- Complement: BC847 (NPN)
- RoHS compliant
Common use: switching and amplification in low-power analog/digital circuits.

Pinout

- Pin count: 3 pins
- Function: PNP general-purpose transistor (used for switching and amplification)
- Package: SOT-23 (QR suffix indicates packaging; lead assignment may vary by variant)

Manufacturer

Manufacturer: NXP Semiconductors (the BC857B-QR is a PNP transistor from the BC857 family; the line traces to Philips Semiconductors and is now under NXP/Nexperia).
What kind of company: NXP is a Dutch multinational semiconductor manufacturer that designs and produces integrated circuits and discrete devices for automotive, industrial, and consumer electronics.

Application

BC857B-QR is a PNP general‑purpose small‑signal transistor (complement of BC847). Key applications:
- Low‑noise signal amplification and switching (Ic up to ~100 mA, Vceo ~45 V)
- High‑side switching and level shifting in bias networks
- Emitter‑follower/buffer stages in audio, sensor, and instrumentation circuits
- Driving other transistors or logic in TTL‑compatible designs
- Compact signal drivers in consumer electronics and DC‑DC front ends
- General purpose small‑signal transistor in SOT‑23 (QR) packaging
Note: suitable for compact, low‑power analog/digital circuits.

Package

BC857B-QR is a SOT-23 (3-pin) surface-mount transistor; QR indicates Tape-and-Reel packaging.

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