onsemi BC640-016G

Overview

BC640-016G from onsemi is a PNP silicon bipolar junction transistor (BJT) designed for general-purpose switching and linear amplification in low-to-medium power circuits. It features −80 V V_CEO, −500 mA continuous collector current, 25–250 DC current gain (h_FE) at multiple bias points, 150 MHz f_T, and TO-92 package with straight leads. It is commonly used in relay drivers, LED drivers, and discrete logic-level translation stages.

For engineers reviewing the BC640-016G datasheet, pinout, applications, or equivalent options, key selection criteria include its PNP polarity, −80 V breakdown rating, −500 mA I_C capability, thermal resistance (R_JA = 200 °C/W), and Pb-free TO-92 packaging - all critical for industrial control, power management, and analog signal conditioning designs.

Technical Context

The BC640-016G operates as a medium-power PNP BJT with verified safe operating area up to −500 mA and −80 V, supporting both saturated switching and active-region amplification. Its h_FE spans 25–250 across IC = −5 mA to −500 mA, enabling stable gain control in bias-sensitive applications like current mirrors and emitter followers.

Dynamic performance includes f_T = 150 MHz at IC = −50 mA, VCE = −2 V, and low output capacitance (C_ob = 9.0 pF), confirming suitability for audio-frequency switching and moderate-speed digital interface buffering where bandwidth and capacitive loading matter.

Key Specifications

Pinout & Package

BC640-016G is housed in a Pb-free TO-92 (Case 29, Style 14) package with straight leads and bulk packaging. Pin 1 is Emitter, Pin 2 is Collector, Pin 3 is Base - confirmed per onsemi's marking diagram and package outline drawing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP transistor applications.

Compared with BC327-40 and MJD2955T4G, BC640-016G uniquely balances −80 V ruggedness, TO-92 manufacturability, and −500 mA capability - making it optimal for cost-sensitive, space-constrained 24–48 V industrial controls where neither low-voltage logic nor high-current power handling dominates.

Availability

BC640-016G is available at Aetrix Electronics and suitable for relay driver circuits, LED current regulation, discrete logic level translation, and analog signal inversion requiring stable component supply and long-term industrial availability.

Supply support for BC640-016G 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering high-performance silicon solutions for automotive, industrial, cloud, and IoT applications.

The BC640-016G belongs to onsemi's general-purpose bipolar transistor product line, engineered for reliability and consistency in industrial control, power management, and analog interface applications where proven discrete performance matters.

FAQ

What is the maximum collector-emitter voltage rating for BC640-016G?

The BC640-016G has a guaranteed V_CEO rating of −80 Vdc, verified under test condition IC = −10 mA and IB = 0. This rating allows safe operation in 48 V DC systems with headroom for inductive kickback and supply ripple. Exceeding this voltage risks junction breakdown and irreversible device failure.

Is BC640-016G suitable for switching applications at 500 mA?

Yes, BC640-016G is rated for −500 mA continuous collector current at TA = 25°C. At this current, V_CE(sat) remains ≤ −0.5 V (max) with −50 mA base drive, ensuring low conduction loss. Derating is required above 25°C ambient per its 5.0 mW/°C thermal coefficient at TA.

Does BC640-016G have a Pb-free package?

Yes, BC640-016G uses a Pb-free TO-92 package, explicitly marked with "G" suffix and confirmed in onsemi's ordering information and package dimensions document. It complies with RoHS Directive 2011/65/EU and supports lead-free soldering processes.

What is the DC current gain (h_FE) range for BC640-016G at different operating points?

BC640-016G offers h_FE = 25–250: minimum 25 at IC = −5 mA, minimum 100 at IC = −150 mA, and minimum 25 at IC = −500 mA (all at VCE = −2 V). This wide but specified range ensures predictable base drive design across low-, medium-, and high-current operating zones.

How does BC640-016G compare to BC639 in terms of polarity and voltage rating?

BC640-016G is a PNP transistor with −80 V V_CEO, while BC639 is its NPN complement with +80 V V_CEO. Both share identical TO-92 packaging, thermal specs, and gain structure, enabling matched pair usage in push-pull or complementary amplifier designs - but BC640-016G must never be substituted for BC639 without circuit polarity revision.