BC817-25W

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BC817-25W

TRANS NPN 45V 0.5A SOT323

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Spezifikationen

Supplier DComponents
Package Strip
ProductStatus Active
TransistorType NPN
Current-Collector(Ic)(Max) 500 mA
Voltage-CollectorEmitterBreakdown(Max) 45 V
VceSaturation(Max)@IbIc 700mV @ 50mA, 500mA
Current-CollectorCutoff(Max) 100nA (ICBO)
DCCurrentGain(hFE)(Min)@IcVce 160 @ 100mA, 1V
Power-Max 200 mW
Frequency-Transition 100MHz
OperatingTemperature -55°C ~ 150°C (TJ)
MountingType Surface Mount
Package/Case SC-70, SOT-323

Übersicht

Description

BC817-25W is a variant of the BC817 family: a general‑purpose NPN small‑signal transistor used for amplification and switching in low‑ to medium‑power circuits.
Key points
- Package options: commonly SOT‑23 (MMBT) or TO‑92; pinout varies by package and manufacturer (verify datasheet).
- Electricals (typical, vary by lot): Vceo ≈ 45 V; Ic up to about 500 mA; Ptot limited by package and cooling (often ~0.5–0.6 W in free air).
- Gain: hFE is bin‑dependent; “25W” is a gain/code/lot designation, not a 25 W power rating.
- Applications: signal amplification, switching, buffering in microcontroller and consumer electronics.
- Important: exact parameters depend on vendor and batch; consult the specific BC817‑25W datasheet for precise min/max values, especially hFE and maximum currents.
Bottom line: it’s a high‑gain, small‑signal NPN suitable for general purpose use; the “25W” suffix indicates a gain/bin Code rather than a wattage rating.

Features

BC817-25W is a general‑purpose NPN transistor. Key features:
- NPN silicon transistor for switching and amplification
- Vceo (max) ≈ 45 V
- Ic max ≈ 500 mA
- Ptot ≈ 0.5–0.6 W (TO‑92 package; varies with mounting)
- hFE (gain): broad range, typically 100–800 depending on Ic and grade
- Low Vce(sat) when used as a switch (a few hundred mV in saturation)
- Temperature range: approx. -55°C to +150°C
- Package: TO‑92 through-hole (BC817W variants exist for SMT)
Note: Exact values vary by specific grade/lot; consult the datasheet for the precise variant.

Package

The BC817-25W is supplied in a TO-92 plastic through-hole package (also referenced as SOT-54). Facing the flat side, the pinout is C‑B‑E (left to right).

Pinout

BC817-25W is a 3‑pin NPN bipolar transistor (typically in a TO‑92 package). Looking at the flat face with leads down: pin‑1 = Collector, pin‑2 = Base, pin‑3 = Emitter. Function: general‑purpose NPN transistor used for low‑power switching and signal amplification (Vce and Ic ratings per datasheet; check exact values for the “-25W” variant).

Manufacturer

Manufacturer: Nexperia (formerly NXP Semiconductors’ discrete business; originally Philips Semiconductors).
What kind of company: Nexperia is a multinational semiconductor company that designs and manufactures discrete devices (transistors, diodes) and other small-signal components used in automotive, industrial, and consumer electronics.

Application

BC817-25W is a general‑purpose NPN transistor for switching and amplification in low‑ to medium‑power circuits. Common applications: relay/LED drivers, microcontroller interfaces and level shifting, small‑signal audio and sensor amplifiers, and compact power‑supply/switching regulator stages. Used in consumer electronics, automotive and industrial equipment where moderate current (hundreds of mA) and tens of volts are adequate.

Equivalent

Equivalent NPN general-purpose transistors to BC817-25W include:
- BC817W (SMD version)
- MMBT3904 / MMBT3904LT1G (SMD)
- BC847B (SOT-23)
- MMBT2222A (SOT-23)
- 2N3904 (TO-92)
- 2N2222A (TO-92)
Note: check hFE range and Vceo for a valid substitute; pinout varies by package.

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