onsemi BC858CLT3

Overview

BC858CLT3 from onsemi is a PNP silicon general-purpose transistor in SOT-23 package, rated for −30 V V_CEO, −30 V V_CBO, −5.0 V V_EBO, −100 mA I_C, and 220–520 h_FE (at I_C = −2.0 mA). It operates across −55°C to +150°C and serves as a low-power switching or linear amplification element in bias networks, level shifters, and discrete logic interfaces.

For engineers reviewing the BC858CLT3 datasheet, pinout, applications, or equivalent options, key selection criteria include its guaranteed h_FE range (C-gain bin), SOT-23 thermal performance (R_JA = 556°C/W on FR-5), V_CE(sat) ≤ −0.65 V at I_C/I_B = 20, and Pb-free compliance per J-STD-609.

Technical Context

The BC858CLT3 is a discrete PNP bipolar junction transistor optimized for general-purpose amplification and switching in space-constrained PCBs. Its design targets stable DC current gain across temperature (−55°C to +150°C) and low saturation voltage under moderate drive conditions (I_B = −5.0 mA).

It features f_T = 100 MHz at I_C = −10 mA, Cob = 4.5 pF at V_CB = −10 V, and NF = 10 dB at I_C = −0.2 mA - confirming suitability for audio-frequency amplification and low-noise preamplifier stages where gain consistency and minimal capacitance matter.

Key Specifications

Pinout & Package

SOT-23 (TO-236AB) package, 3-pin surface-mount, JEDEC-standard footprint (3.04 mm × 1.40 mm × 1.11 mm max), Pb-free compliant, tape-and-reel packaging (10,000 pcs/reel).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC858CLT3, BC857CLT3 offers higher voltage tolerance without sacrificing gain or package compatibility, while MMBT3906LT1G trades guaranteed C-bin h_FE for broader availability and slightly improved thermal resistance - making it suitable for less critical biasing tasks.

Availability

BC858CLT3 is available at Aetrix Electronics and suitable for LED driver circuits, level shifter interfaces, analog sensor bias networks, discrete logic inverters, and industrial temperature monitoring systems requiring stable component supply and RoHS-compliant sourcing.

Supply support for BC858CLT3 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 specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and IoT markets.

The BC858CLT3 belongs to onsemi's BC856ALT1 Series of general-purpose PNP transistors, designed for reliable, low-cost discrete amplification and switching in space-constrained PCBs across consumer, industrial, and automotive applications.

FAQ

What is the maximum continuous collector current rating for BC858CLT3?

The BC858CLT3 has a maximum continuous collector current (I_C) rating of −100 mA at T_A = 25°C. Derating applies above 25°C at 1.8 mW/°C on FR-5 board. This rating assumes adequate PCB copper area for heat dissipation; actual usable current depends on ambient temperature, layout, and duty cycle in pulsed operation.

Does BC858CLT3 have a guaranteed current gain bin, and what is its range?

Yes, BC858CLT3 is the C-gain variant in the BC856ALT1 Series, with a guaranteed DC current gain (h_FE) range of 220 to 520 at I_C = −2.0 mA and V_CE = −5.0 V. This tight bin enables predictable biasing in amplifier and current-source designs without post-manufacturing sorting or trimming.

What is the package type and pin configuration of BC858CLT3?

BC858CLT3 uses the SOT-23 (TO-236AB) package with standard pinout: Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector. Dimensions are 3.04 mm × 1.40 mm × 1.11 mm max, fully compatible with automated pick-and-place equipment and reflow soldering per J-STD-020.

Is BC858CLT3 RoHS-compliant and halogen-free?

Yes, BC858CLT3 is RoHS-compliant and halogen-free. The "G" suffix (e.g., BC858CLT3G) explicitly denotes Pb-free construction, but even standard BC858CLT3 meets J-STD-609 Class 3 marking requirements and contains no intentionally added halogens per IEC 61249-2-21.

What is the typical transition frequency (f_T) of BC858CLT3, and under what conditions is it measured?

The BC858CLT3 has a typical transition frequency (f_T) of 100 MHz, measured at I_C = −10 mA, V_CE = −5.0 Vdc, and f = 100 MHz. This parameter confirms its capability for small-signal amplification in audio and low-speed RF applications, though it is not characterized for RF power use.