onsemi BC327-025

Overview

BC327-025 from onsemi is a PNP silicon bipolar junction transistor designed for general-purpose amplification and switching in low-voltage, medium-current circuits. It features a −45 V collector-emitter breakdown voltage, −800 mA continuous collector current, 250–630 DC current gain (h_FE) at −300 mA, −0.7 V collector-emitter saturation voltage, and TO-92 package for through-hole mounting in power management and signal conditioning stages.

For engineers reviewing the BC327-025 datasheet, pinout, applications, or equivalent options, key selection criteria include verified h_FE range (250–630), guaranteed V_CE(sat) ≤ −0.7 V at I_C = −500 mA/I_B = −50 mA, thermal resistance R_JA = 200 °C/W, and Pb-free TO-92 compatibility for industrial control and automotive body electronics.

Technical Context

The BC327-025 operates as a medium-power PNP BJT with fixed emitter-base and collector-base junction structures optimized for linear amplification and saturated switching. Its h_FE binning (250–630) ensures predictable current drive in base-controlled loads, while its −1.2 V V_BE(on) and −0.7 V V_CE(sat) support efficient operation in complementary pair configurations and discrete driver stages.

Thermal performance is defined by R_JC = 83.3 °C/W and R_JA = 200 °C/W, enabling stable operation up to +150 °C junction temperature. The device meets JEDEC TO-92 mechanical standards (Case 29, Style 17) with collector-base-emitter pinout and supports both bulk and tape-and-reel delivery formats.

Key Specifications

Pinout & Package

BC327-025 is housed in a standard JEDEC TO-92 plastic package (Case 29, Style 17), with leads formed for through-hole PCB mounting and marked "32725" on the case.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC327-025, BC327-25 offers identical performance in alternate packaging formats, while BC807-25 provides footprint reduction at the cost of thermal headroom and current capacity-making BC327-025 optimal for through-hole, medium-power switching where reliability and ease of prototyping are prioritized.

Availability

BC327-025 is available at Aetrix Electronics and suitable for automotive body electronics, industrial relay interfaces, and consumer appliance power sequencing requiring stable component supply and long-term manufacturability.

Supply support for BC327-025 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, analog, sensor, and connectivity solutions for automotive, industrial, cloud, medical, and IoT applications.

The BC327 series belongs to onsemi's general-purpose bipolar transistor product line, engineered for cost-sensitive, high-volume applications demanding proven reliability, wide h_FE grading, and full Pb-free compliance without sacrificing electrical performance.

FAQ

What is the maximum continuous collector current rating for BC327-025?

The BC327-025 has a maximum continuous collector current (I_C) rating of −800 mAdc at T_A = 25°C. This rating assumes adequate PCB copper area or heatsinking; derating is required above 25°C ambient per the 5.0 mW/°C specification. Operation near this limit must consider V_CE(sat) and thermal resistance to avoid exceeding the 150°C maximum junction temperature.

Does BC327-025 have a Pb-free version available?

Yes, BC327-025G is the official Pb-free variant of BC327-025, fully compliant with RoHS Directive 2011/65/EU. It shares identical electrical specifications, TO-92 package dimensions, and thermal characteristics with the standard version, differing only in lead finish and marking (suffix "G"). No requalification is needed when migrating from BC327-025 to BC327-025G.

What is the DC current gain (h_FE) range specified for BC327-025?

The BC327-025 is binned for h_FE = 250–630 when tested at I_C = −300 mA and V_CE = −1.0 V. This range is confirmed in the "ON CHARACTERISTICS" table of the official datasheet (Rev. 3, January 2006). Designers should use the minimum value (250) for worst-case base drive calculations to ensure saturation across all units.

Can BC327-025 be used in linear amplifier applications?

Yes, BC327-025 supports linear operation with a transition frequency (f_T) of 260 MHz and typical output capacitance (C_ob) of 11 pF. Its SOA curve permits safe active-region operation up to −100 mA at −10 V V_CE, making it suitable for low-noise preamplifiers and emitter-follower buffers-provided biasing remains within the thermal and voltage limits defined in the datasheet.

What is the pin configuration for BC327-025 in the TO-92 package?

When viewed with the flat side facing forward and leads pointing downward, BC327-025 follows the standard TO-92 pinout: Pin 1 is Collector, Pin 2 is Base, and Pin 3 is Emitter. This configuration is explicitly documented in the "MARKING DIAGRAM" section and "PACKAGE DIMENSIONS" page of the BC327/D datasheet, and is consistent across all BC327 variants.