onsemi BC327-25ZL1

Overview

BC327-25ZL1 from onsemi is a PNP silicon bipolar junction transistor designed for general-purpose amplification and switching in low-voltage, medium-current circuits. It features V_CEO = −45 V, I_C = −800 mA, h_FE = 160–400 (at I_C = −100 mA), V_CE(sat) ≤ −0.7 V (at I_C = −500 mA, I_B = −50 mA), and TO-92 package with collector-base-emitter pinout. It is commonly used in discrete power stage drivers, relay interfaces, and LED load switches.

For engineers reviewing the BC327-25ZL1 datasheet, pinout, applications, or equivalent options, key selection considerations include guaranteed DC current gain range, saturation voltage at defined drive conditions, thermal resistance (R_JA = 200 °C/W), safe operating area limits, and Pb-free tape-and-ammo packaging compliance.

Technical Context

The BC327-25ZL1 operates as a medium-power PNP BJT with fixed gain binning (h_FE = 160–400), optimized for linear amplification and hard-switching applications where base-driven control and predictable saturation behavior are required. Its −45 V V_CEO rating supports operation in 24 V and 36 V industrial supply rails.

Thermal design relies on its R_JA = 200 °C/W (free-air) and R_JC = 83.3 °C/W ratings, with SOA curves specifying second-breakdown-limited operation down to 1 ms pulses. The device exhibits f_T = 260 MHz and C_ob = 11 pF, indicating suitability for audio-frequency and low-MHz switching but not RF signal paths.

Key Specifications

Pinout & Package

BC327-25ZL1 is housed in a standard TO-92 plastic package (Case 29, Style 17), with leads formed for through-hole mounting and marked "32725" on the body. Pin 1 is Collector, Pin 2 is Base, Pin 3 is Emitter - verified per onsemi datasheet Figure 1 and Ordering Information table.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP BJT switching and amplification applications.

Compared with BC327-25 and MMBT327-25, BC327-25ZL1 uniquely combines guaranteed gain binning, TO-92 mechanical robustness, tape-and-ammo packaging for automated insertion, and 625 mW power handling-making it optimal for industrial control modules requiring long-term supply continuity and mixed-technology assembly.

Availability

BC327-25ZL1 is available at Aetrix Electronics and suitable for relay driver stages, LED current sinks, DC motor direction control, and level-shifting interfaces requiring stable component supply, consistent parametric performance, and RoHS-compliant through-hole assembly.

Supply support for BC327-25ZL1 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, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The BC327 series belongs to onsemi's general-purpose bipolar transistor product line, engineered for cost-sensitive, high-reliability discrete switching and amplification in industrial controls, power supplies, and interface circuits.

FAQ

What is the guaranteed DC current gain (h_FE) range for BC327-25ZL1?

The BC327-25ZL1 is binned to h_FE = 160–400 at I_C = −100 mA and V_CE = −1.0 V, as specified in the onsemi BC327/D datasheet Rev. 3. This range is tested and guaranteed per unit, enabling accurate base resistor design without derating for β spread. The BC327-25ZL1 achieves this performance using the same silicon die as BC327-25, with identical electrical characterization.

Is BC327-25ZL1 RoHS compliant and lead-free?

Yes, BC327-25ZL1 is a Pb-free device, confirmed by onsemi's marking "32725" and packaging designation "ZL1G" in the Ordering Information table. It meets RoHS Directive 2011/65/EU requirements and is qualified for lead-free soldering per onsemi SOLDERINGRM/D. The BC327-25ZL1 uses matte tin-plated leads and halogen-free molding compound.

What is the maximum continuous power dissipation for BC327-25ZL1 at 25°C ambient?

BC327-25ZL1 has a maximum continuous power dissipation of 625 mW at T_A = 25°C, with a derating factor of 5.0 mW/°C above that temperature. This value is validated under free-air conditions per the Thermal Characteristics table. The BC327-25ZL1 achieves this rating using its TO-92 package with R_JA = 200 °C/W, and actual dissipation must remain within SOA limits shown in Figure 2.

Can BC327-25ZL1 replace BC327-25 in existing designs?

Yes, BC327-25ZL1 is a direct functional and parametric replacement for BC327-25, sharing identical electrical specifications, TO-92 package dimensions, and pinout. The only differences are packaging format (tape-and-ammo vs. bulk) and traceability labeling. No PCB or schematic changes are needed when substituting BC327-25ZL1 for BC327-25 in production.

What is the safe operating area (SOA) limitation for BC327-25ZL1 at 10 ms pulse width?

Per Figure 2 of the BC327/D datasheet, BC327-25ZL1 supports up to −300 mA at −45 V for 10 ms pulses under thermal-limited conditions, with second-breakdown limiting conduction beyond that boundary. The BC327-25ZL1 SOA curve is defined for single-pulse operation at T_C = 25°C and must be de-rated for repeated pulses or elevated case temperatures.