onsemi BC327G

Overview

BC327G from onsemi is a PNP epitaxial silicon transistor designed for switching and low-power amplification, with −45 V V_CEO, −800 mA I_C, 100–630 h_FE (at I_C = −100 mA), and TO-92 3-pin package; used in AF driver stages, low-power output stages, and complementary pair configurations with BC337/BC338.

For engineers reviewing the BC327G datasheet, pinout, applications, or equivalent options, key selection factors include guaranteed h_FE classification (25 or 40), V_CE(sat) ≤ −0.7 V at I_C = −500 mA/I_B = −50 mA, thermal resistance of 200 °C/W, and Pb-free TO-92 packaging compliant with RoHS.

Technical Context

The BC327G operates as a general-purpose PNP bipolar junction transistor with DC current gain specified across two test conditions: h_FE1 (V_CE = −1 V, I_C = −100 mA) and h_FE2 (V_CE = −1 V, I_C = −300 mA), supporting both linear amplification and saturated switching.

Its breakdown ratings-BVCES = −50 V, BVCEO = −45 V, and BVEBO = −5 V-define safe operating limits under open-base and open-emitter conditions, while f_T = 100 MHz enables use in audio-frequency signal paths up to ~20 MHz small-signal applications.

Key Specifications

Pinout & Package

BC327G is housed in a Pb-free TO-92 3-pin plastic package (Case 135AN/135AR), with standard leadform and 4.83 mm × 4.76 mm footprint. Pin assignment is standardized across onsemi's BC327 series.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC327G, BC327-40TA offers identical performance in a mechanically distinct TO-92 variant, while MMBT3906LT1G provides SMT compatibility at the cost of current rating and gain headroom-making BC327G optimal for through-hole, medium-current, gain-stable designs.

Availability

BC327G is available at Aetrix Electronics and suitable for audio driver stages, low-power switching loads, and complementary transistor pair applications requiring stable component supply, consistent h_FE binning, and RoHS-compliant TO-92 packaging.

Supply support for BC327G 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, and consumer markets.

The BC327G belongs to onsemi's legacy general-purpose bipolar transistor family, engineered for reliability in discrete amplifier and switching circuits where cost, consistency, and manufacturability are critical.

FAQ

What is the maximum collector current rating for BC327G?

The BC327G has a maximum continuous collector current (I_C) rating of −800 mA at T_A = 25 °C. This rating decreases with rising ambient temperature due to its 5.0 mW/°C thermal derating coefficient and 200 °C/W junction-to-ambient thermal resistance. For sustained operation above 25 °C, design margins must account for power dissipation limits defined by P_D = 625 mW at 25 °C.

Does BC327G have a specified h_FE classification, and how does it affect circuit design?

Yes, BC327G is offered in h_FE classifications - notably BC327-25G and BC327-40G - with guaranteed minimum/maximum DC current gain values at I_C = −100 mA. This allows designers to select a precise gain bin for stable biasing in amplifier or switch driver circuits without relying on external feedback or trimming, improving production yield and performance consistency across BC327G units.

What is the pin configuration of BC327G, and how is it oriented in-circuit?

The BC327G uses a standard TO-92 3-pin configuration: Pin 1 = Collector, Pin 2 = Base, Pin 3 = Emitter, with leads viewed from the flat side of the package and text upright. In typical common-emitter switching applications, the emitter connects to V_CC, the collector drives the load to ground, and the base receives negative current via a series resistor - ensuring correct polarity and functional operation of the PNP device.

Can BC327G be used as a direct replacement for BC327-25BU or BC327-40TA?

BC327G shares identical electrical specifications with BC327-25BU and BC327-40TA, differing only in packaging: BC327G uses the standard straight-lead TO-92 (Case 135AN), while BC327-40TA uses leadformed TO-92 (Case 135AR). Therefore, BC327G is electrically interchangeable but requires matching the PCB land pattern to its straight-lead form - it is not mechanically identical to BC327-40TA without layout adjustment.

What is the typical application context for BC327G in relation to BC337/BC338?

The BC327G serves as the PNP complement to the NPN BC337 and BC338 transistors, enabling matched-pair implementations in push-pull amplifiers, differential pairs, and H-bridge driver stages. Its specified V_CE(sat), h_FE, and thermal characteristics are aligned with those NPN counterparts, allowing symmetrical conduction and minimized crossover distortion - a key requirement in BC327G-based analog and switching designs.