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BC857ALT1G

Name: BC857ALT1G
Rating: 4.7 (12 reviews)

TRANS PNP 45V 0.1A SOT23-3

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仕様

Part Status	Active
Base Product Number	BC857
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 (hFE) (Min) @ Ic, Vce	125 @ 2mA, 5V
Power - Max	300 mW
Frequency - Transition	100MHz
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package	TO-236-3, SC-59, SOT-23-3
Supplier Device Package	SOT-23-3 (TO-236)
Packaging	Cut Tape (CT), Tape & Reel (TR)

概要

Description

BC857ALT1G is a variant in the BC857 family of general‑purpose PNP small‑signal transistors. The “ALT1G” suffix is a vendor‑specific code (often related to packaging, lead form, temperature grade, or lot) and does not define new electrical specs by itself. In typical BC857 parts, you get a PNP device suitable for low‑noise signal amplification and switching.
Common (variant‑dependent) specs you’ll see referenced in datasheets:
- Vceo around 45 V
- Ic up to about 100 mA
- hFE range that depends on grade (e.g., ~100–450)
Applications include audio and small‑signal amplification, buffers, and switching in analog/digital circuits. It usually comes in TO‑92 (through‑hole) or SOT‑23 (surface‑mount) packaging, depending on the manufacturer.
For exact electrical specs, pinout, and packaging details for BC857ALT1G, consult the specific datasheet from the supplier.

Features

BC857ALT1G features (concise):
- PNP general‑purpose transistor, suitable for small-signal amplification and switching
- Package: RoHS‑compliant ALT1G variant in a TO‑92 three‑lead package
- Voltage/current ratings: Vceo up to 45 V; Ic up to 100 mA
- Power: typical total dissipation about 0.3 W (at 25°C)
- Gain: dc current gain hFE ranges (depending on grade) roughly 110–800; with ALT1G/“A” grade often ~110–220
- Low noise for analog/sensor applications
- Complement to BC847 (NPN)
- Biasing and switching behavior suitable for small signals
- Temperature range: roughly −55°C to +150°C
- Broad availability and well-suited for discrete signal paths and interface circuitry
Note: exact hFE class (A/B/C) and packaging details may vary by supplier; BC857ALT1G is the PNP complement of BC847 in a TO‑92/ALT1G RoHS variant.

Package

SOT-23 (3-pin) surface-mount package.

Pinout

- Pin count: 3 pins
- Function: General-purpose PNP transistor (SOT-23) used for amplification and switching in low-power circuits (typically in a common-emitter configuration).

Manufacturer

Manufacturer: Nexperia. Nexperia is a global semiconductor company that specializes in discrete devices (transistors, diodes), logic components, and MOSFETs.

Application

- BC857ALT1G is a PNP general-purpose small-signal transistor.
- Used for amplification and switching in low-power analog circuits.
- Common in high-side switching, emitter-follower buffers, and level-shifting stages.
- Suitable for audio/preamp input stages, sensor interfaces, control circuits, and general purpose applications in consumer, instrumentation, and automotive electronics (within its ratings).

Equivalent

Equivalent devices for BC857ALT1G (SOT-23 PNP general-purpose transistor):
- BC857A, BC857B, BC857C (same family, different gain ranges)
- MMBT3906 / PMBT3906 (SMD equivalents of 2N3906)
- 2N3906 (through-hole, same function; pinout may differ)
Note: check pinout and Vceo/hFE specs to ensure compatibility across vendors.