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BC859B

Name: BC859B
Rating: 4.7 (12 reviews)

TRANS PNP 30V 0.1A SOT23-3

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Mfr。パート #BC859B
パッケージ TO-236-3, SC-59, SOT-23-3
データシート BC859B DataSheet
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仕様

Supplier	DComponents
Package	Strip
ProductStatus	Active
TransistorType	PNP
Current-Collector(Ic)(Max)	100 mA
Voltage-CollectorEmitterBreakdown(Max)	30 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	-55°C ~ 150°C (TJ)
MountingType	Surface Mount
Package/Case	TO-236-3, SC-59, SOT-23-3

概要

Description

BC859B is a general‑purpose, low‑noise PNP small‑signal transistor in a TO‑92 package (also available in SOT‑23). It’s used for amplifying small signals and for switching in analog/digital circuits. It’s part of the BC859 family; the B suffix indicates a mid‑gain grade (A highest, C lowest). Typical ratings: Vceo ≈ -45 V, Ic up to 100 mA. DC current gain (hFE) is in the hundreds (typical around 200–350, depending on Ic and temperature). It operates over standard temperatures (roughly -55 to +150 °C). It’s the PNP complement of BC847/BC857 in many designs. For exact figures, consult the datasheet for the specific lot and package variant (TO‑92 or SOT‑23) and the hFE band.

Features

BC859B is a PNP, small-signal transistor. Key features:
- Package: TO-92 (through-hole)
- Low-noise, high-gain device (B-grade hFE)
- Ic up to about 100 mA
- Vceo up to about 80 V
- Complement to BC849 (NPN)
- Used for general small-signal amplification and switching (audio/SF front-ends, sensors, etc.)
Note: variants and exact specs may vary by manufacturer; always check the datasheet for your lot.

Package

BC859B is a small‑signal PNP transistor commonly supplied in SOT‑23 (SMD, 3‑lead) package. It is also available in the through‑hole TO‑92 variant from some manufacturers.

Pinout

Pin count: 3 (SOT‑23 or TO‑92 variants have three leads).
Function: BC859B is a PNP small‑signal bipolar junction transistor used for low‑power switching and amplification. Its three pins are the emitter, base and collector (pin order depends on package/manufacturer—check the specific datasheet for the exact pin mapping). The "B" denotes the medium hFE gain group.

Manufacturer

The BC859B is commonly manufactured by Nexperia. Nexperia is a global semiconductor company (headquartered in Nijmegen, Netherlands) that designs and manufactures discrete semiconductors, MOSFETs, logic and analog ICs—supplying components for automotive, industrial and consumer electronics.

Application

BC859B is a general‑purpose, low‑noise PNP transistor (complement to BC849). Key applications:
- Small‑signal amplification and buffering (emitter followers, CE stages) in audio, sensors, and instrumentation.
- High‑side switching and active loads in analog circuits.
- Input/level‑shifting stages and differential pair implementations in low‑noise designs.
- General‑purpose switching in control circuits.

Equivalent

BC859B is a small‑signal PNP transistor. Common equivalents: BC558B (TO‑92), 2N3906 / MMBT3906 (general PNP), 2N5087 / MMBT5087 (low‑noise PNP), BC857B / BC807 series (similar PNP families). Always verify Vce, Ic, hFE, noise and package before substituting.