Diodes Incorporated BC858BW-7-F

Overview

BC858BW-7-F from Diodes Incorporated is a PNP small-signal transistor in SOT323 package, rated for V_CEO = −30 V, I_C = −100 mA, and h_FE = 220–475 (Group B), optimized for switching and audio-frequency amplification in space-constrained PCBs.

For engineers reviewing the BC858BW-7-F datasheet, BC858BW-7-F pinout, BC858BW-7-F application, or BC858BW-7-F equivalent, this part supports low-voltage PNP switching, bias networks, and discrete gain stages where thermal efficiency, lead-free compliance, and JEDEC-reliable packaging are required.

Technical Context

This device operates as a general-purpose PNP bipolar junction transistor with complementary NPN counterparts (BC846AW–BC848CW). Its −30 V V_CEO and −300 mV V_CE(sat) at I_C = −10 mA / I_B = −0.5 mA enable reliable saturation in low-side switch configurations.

With f_T = 100–200 MHz and NF = 10 dB at 1 kHz, it supports AF amplification up to ~100 kHz with low noise and stable h_FE across −55°C to +150°C operating range.

Key Specifications

Pinout & Package

Package: SOT323 - ultra-small surface-mount plastic case (2.15 mm × 2.10 mm × 0.95 mm), moisture sensitivity level 1, matte tin-plated leads, 0.006 g weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC857BW-7-F, BC858BW-7-F offers tighter voltage margin but lower saturation loss at 10 mA; versus MMBT858LT1G, it provides identical voltage ratings in a smaller SOT323 footprint but with reduced current capacity and non-interchangeable pinout.

Availability

BC858BW-7-F is available at Aetrix Electronics and suitable for LED driver switching, audio pre-amplifier stages, and level translation interfaces requiring stable component supply, RoHS-compliant manufacturing, and JEDEC-reliable performance.

Supply support for BC858BW-7-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

BC858BW-7-F belongs to the BC856AW–BC858CW PNP transistor family, designed specifically for cost-sensitive, high-volume switching and amplification applications in consumer, industrial, and automotive-qualified systems.

FAQ

What is the pin configuration of BC858BW-7-F?

The BC858BW-7-F uses SOT323 package with top-view pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. This matches JEDEC standard SOT323 orientation and differs from SOT-23 (which has E-B-C order). Confirm placement using the marking dot and datasheet top view diagram.

Is BC858BW-7-F suitable for automotive applications?

BC858BW-7-F is a standard-grade part qualified to JEDEC reliability standards but not AEC-Q200. For automotive use, Diodes offers the automotive-qualified BC858BWQ-13-F variant with PPAP documentation, IATF 16949 manufacturing, and extended temperature validation.

How does BC858BW-7-F compare to BC847BW-7-F?

BC858BW-7-F is PNP while BC847BW-7-F is its complementary NPN counterpart. They share identical SOT323 package, Group B h_FE, and thermal specs, but differ in polarity, voltage polarity conventions, and typical circuit roles-enabling push-pull or differential pair designs.

What is the maximum safe operating temperature for continuous use?

The BC858BW-7-F has an operating junction temperature range of −55°C to +150°C. At ambient temperatures above 70°C, derating applies: power dissipation must be reduced linearly from 200 mW at 25°C to zero at 150°C, based on R_θJA = 625 °C/W and minimum pad layout.