onsemi BCW60A

Overview

BCW60A from Fairchild Semiconductor is an NPN epitaxial silicon general-purpose transistor in SOT-23 package, rated for 32 V V_CEO, 100 mA I_C, and 350 mW P_C, commonly used in low-power switching and amplification stages of portable audio and signal conditioning circuits.

For engineers reviewing the BCW60A datasheet, pinout, applications, or equivalent options, key selection criteria include its h_FE range (60–100 at I_C = 10 µA), f_T = 125 MHz, V_BE(sat) ≤ 0.85 V at I_C = 10 mA, Cob = 4.5 pF, and SOT-23 footprint compatibility with space-constrained PCB layouts.

Technical Context

The BCW60A operates as a discrete NPN bipolar junction transistor optimized for linear amplification and digital switching in low-voltage, low-current signal paths. Its DC current gain is specified at three test points-60–100 at I_C = 10 µA, 70–220 at I_C = 2 mA, and 90–310 at I_C = 50 mA-indicating graded gain binning across the BCW60 family.

It features a 125 MHz current-gain bandwidth product and 6 dB noise figure at 1 kHz, supporting audio preamplifier and RF front-end roles where moderate gain stability and low-noise performance are required within its 32 V breakdown limits.

Key Specifications

Pinout & Package

SOT-23 plastic surface-mount package with gull-wing leads; 1.3 mm × 2.9 mm footprint, 1.1 mm height, and JEDEC MO-178 compliant outline.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN small-signal transistor applications.

Compared with BC846A and MMBT3904, the BCW60A offers the lowest noise figure and most consistent h_FE behavior at sub-mA bias currents-making it uniquely suitable for battery-operated sensor front-ends and low-power analog signal chains where gain stability and noise floor dominate selection.

Availability

BCW60A is available at Aetrix Electronics and suitable for portable audio preamplifiers, LED status indicators, RF oscillator buffers, and logic-level translation circuits requiring stable component supply and long-term obsolescence management.

Supply support for BCW60A 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.

The BCW60A belongs to Fairchild's legacy general-purpose bipolar transistor product line, designed specifically for cost-effective, high-yield implementation in consumer electronics, industrial controls, and communication interface circuits.

FAQ

What is the maximum collector-emitter voltage rating for BCW60A?

The BCW60A has a maximum collector-emitter voltage (V_CEO) rating of 32 V at T_A = 25°C. This value decreases with rising ambient temperature due to thermal derating, and operation above this limit risks avalanche breakdown. The BCW60A datasheet specifies this absolute maximum rating under standard test conditions and must be respected in all circuit designs using BCW60A.

Does BCW60A have a documented noise figure specification?

Yes, the BCW60A has a specified noise figure of 6 dB at I_C = 0.2 mA, V_CE = 5 V, R_G = 2 kΩ, and f = 1 kHz. This measured value makes BCW60A suitable for low-noise preamplifier applications such as microphone or sensor signal conditioning, where maintaining signal integrity at low amplitudes is critical. The BCW60A noise performance is confirmed in Fairchild's official Rev. B2 datasheet.

What is the pin configuration of BCW60A in the SOT-23 package?

The BCW60A uses a standard SOT-23 pinout: Pin 1 is Base, Pin 2 is Emitter, and Pin 3 is Collector. This configuration is explicitly shown in the "Package Dimensions" section of the Fairchild BCW60A/B/C/D datasheet (Rev. B2, December 2002) and matches JEDEC MO-178 mechanical outline. No alternate pinouts are documented for BCW60A, and this arrangement applies exclusively to the BCW60A variant.

How does BCW60A's h_FE vary with collector current?

BCW60A's h_FE is binned and tested at three collector current levels: 60–100 at I_C = 10 µA, 70–220 at I_C = 2 mA, and 90–310 at I_C = 50 mA. This progression reflects typical BJT gain behavior-lower h_FE at very low I_C, peaking near mid-current, then declining at high current. Designers must select bias points accordingly; BCW60A performs best in linear amplification at I_C ≈ 0.1–2 mA, where h_FE is both stable and sufficient.

Is BCW60A suitable for RF amplifier applications?

Yes, BCW60A is suitable for RF amplifier applications up to approximately 30 MHz, supported by its 125 MHz f_T and 4.5 pF output capacitance. It has been used in local oscillator buffers and IF amplifiers in sub-GHz transceivers. However, its 6 dB noise figure and gain flatness are optimized for low-to-mid frequency analog use-not microwave bands. For RF designs, BCW60A requires proper biasing, impedance matching, and layout attention to parasitics, as confirmed in Fairchild's application guidance for the BCW60 family.