onsemi BCV71

Overview

BCV71 from Philips Semiconductors is an NPN general purpose transistor in SOT23 package, rated for 60 V V_CEO, 100 mA I_C, and 250 mW P_tot, with DC current gain (h_FE) of 110–220 at I_C = 2 mA, used in low-power switching and small-signal amplification circuits.

For engineers reviewing the BCV71 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, validated SOT23 terminal mapping, real-world use cases in portable logic interfaces and sensor signal conditioning, and two confirmed alternative transistors with documented gain and voltage trade-offs.

Technical Context

The BCV71 operates as a silicon NPN bipolar junction transistor optimized for linear amplification and digital switching at low currents (<100 mA) and moderate voltages (≤60 V). Its thermal resistance (R_{th j-a}) is 500 K/W on FR4 PCB, and its transition frequency f_T reaches 100 MHz at I_C = 10 mA, supporting audio and low-speed digital signal handling.

It features low noise figure (≤10 dB at 1 kHz), tight V_BE range (550–700 mV), and low saturation voltages (V_CEsat ≤ 250 mV at I_C = 10 mA), enabling efficient operation in battery-powered analog front-ends and discrete logic level translators.

Key Specifications

Pinout & Package

SOT23 plastic surface-mounted package (3 leads), dimensions per IEC/JEDEC standard: D = 2.8 mm, E = 1.4 mm, Lp = 1.2 mm, bp = 0.48 mm, c = 0.38 mm; suitable for automated pick-and-place assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN general purpose transistor applications.

Compared with BCV71, BC846B offers higher and more tightly binned gain for precision amplification, while MMBT3904 provides broader industry availability but sacrifices 20 V of collector-emitter standoff and introduces greater h_FE variability-critical for deterministic switching thresholds.

Availability

BCV71 is available at Aetrix Electronics and suitable for portable logic translation, low-power sensor amplification, LED current switching, and discrete oscillator core applications requiring stable component supply and long-term obsolescence management.

Supply support for BCV71 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Philips Semiconductors (now NXP Semiconductors) is a global semiconductor innovator founded in the Netherlands, specializing in analog, logic, and discrete components for industrial, automotive, and consumer electronics.

The BCV71 belongs to Philips' legacy general-purpose transistor family designed for cost-sensitive, reliability-critical discrete circuit functions-including switching, amplification, and interface buffering-in compact SOT23 form factor.

FAQ

What is the maximum collector-emitter voltage rating for BCV71?

The BCV71 has a maximum collector-emitter voltage (V_CEO) rating of 60 V under open-base conditions with I_C = 2 mA. This rating defines the absolute upper limit for voltage applied between collector and emitter before risk of avalanche breakdown; operation above this value-even briefly-may cause permanent device failure. Always maintain at least 20 % derating margin in production designs using BCV71.

Does BCV71 have a guaranteed DC current gain (h_FE) range?

Yes, the BCV71 guarantees h_FE of 110 to 220 when tested at I_C = 2 mA and V_CE = 5 V. This range is measured and binned per datasheet specifications-not typical or average-and applies across the full operating temperature range (−65 °C to +150 °C). Designers must size base resistors assuming the minimum h_FE of 110 to ensure saturation in switching applications using BCV71.

What package type is used for BCV71 and is it RoHS-compliant?

The BCV71 uses the SOT23 plastic surface-mount package with standardized 3-lead pinout (base, emitter, collector). While the original 1999 datasheet predates RoHS legislation, current production batches supplied by Aetrix Electronics meet RoHS Directive 2011/65/EU requirements, with lead content <1000 ppm and compliant exemptions applied per Annex III. Full material declarations for BCV71 are available upon request.

Can BCV71 be used in linear amplifier configurations?

Yes, BCV71 is explicitly characterized for linear operation with parameters including noise figure (≤10 dB), transition frequency (100 MHz), and V_BE (550–700 mV), all specified at T_j = 25 °C. Its low C_c (2.5 pF) and stable h_FE support Class-A and Class-AB amplifier topologies up to ~5 MHz. For BCV71, ensure I_C remains ≤50 mA and P_tot derated per ambient temperature to avoid thermal runaway.

How does BCV71 differ from BCV72 in practical circuit design?

The BCV72 shares identical package, voltage/current ratings, and thermal specs with BCV71 but features higher DC current gain: h_FE = 200–450 at I_C = 2 mA versus BCV71's 110–220. In practice, this means BCV72 requires less base drive current for the same collector load, improving efficiency in battery-powered switches-but also increasing sensitivity to base leakage and temperature drift. Use BCV71 where gain consistency and lower β variation are prioritized over drive reduction.