onsemi BD536J

Overview

BD536J from Fairchild Semiconductor is a PNP epitaxial silicon power transistor in TO-220 package, rated for -60 V V_CEO, -8 A I_C, 50 W P_C, with h_FE ≥ 20 at V_CE = -5 V and I_C = -10 mA, used in medium-power linear regulation and switching circuits such as DC motor drivers and power supply output stages.

For engineers reviewing the BD536J datasheet, pinout, applications, or equivalent options, key selection criteria include its -60 V collector-emitter breakdown rating, low -0.8 V V_CE(sat) at -2 A/-0.2 A drive, TO-220 thermal performance, complementary pairing with BD535, and h_FE group J classification for consistent gain matching in push-pull designs.

Technical Context

The BD536J operates as a medium-power PNP bipolar junction transistor optimized for linear and switching applications requiring robust voltage blocking and controlled saturation behavior. Its design supports stable DC biasing at -2 V V_CE with I_C up to -2 A and delivers h_FE ≥ 20 under those conditions, while maintaining V_CE(sat) ≤ -0.8 V at -2 A collector current with -0.2 A base drive.

Thermal management is enabled by its TO-220 package with 50 W power dissipation at T_C = 25°C and derating to zero at 150°C junction temperature. It exhibits low leakage: ICBO ≤ -100 µA at V_CB = -60 V and IEBO ≤ -1 mA at V_EB = -5 V, supporting reliable cutoff in high-voltage PNP configurations.

Key Specifications

Pinout & Package

BD536J is housed in a standard TO-220 package with metal tab connected to collector, suitable for heatsink mounting and rated for 50 W dissipation at T_C = 25°C. Pin numbering follows JEDEC TO-220 outline: Pin 1 = Base, Pin 2 = Collector (tab), Pin 3 = Emitter.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MJD536G and BD536, the BD536J offers guaranteed h_FE ≥ 30 in Group J-critical for predictable base current in high-reliability linear regulators and matched amplifier stages-while retaining identical voltage, current, and thermal ratings.

Availability

BD536J is available at Aetrix Electronics and suitable for DC motor control, linear regulator pass elements, and industrial relay driver applications requiring stable component supply, long-term obsolescence planning, and traceable sourcing from authorized channels.

Supply support for BD536J 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.

The BD536J belongs to Fairchild's BD53x PNP transistor family, engineered for medium-power linear and switching applications where low saturation voltage, high breakdown rating, and complementary NPN pairing were essential design goals.

FAQ

What is the maximum continuous collector current rating for BD536J?

The BD536J has a maximum continuous collector current (I_C) rating of -8 A at T_C = 25°C. This rating assumes proper heatsinking and derates linearly with increasing case temperature, reaching zero at 150°C. Actual usable current depends on PCB layout, ambient temperature, and heatsink efficiency-designers must verify thermal performance using the 50 W P_C limit and published derating curve.

Is BD536J pin-compatible with BD534 or BD538?

Yes, BD536J shares identical TO-220 pinout (Base–Collector–Emitter) and mechanical footprint with BD534 and BD538, but differs in voltage ratings: BD534 is -45 V rated, BD536J is -60 V, and BD538 is -80 V. Substitution requires verifying that the lower-voltage BD534 meets system stress requirements or that the higher-voltage BD538 does not compromise h_FE or V_CE(sat) performance in the target circuit.

What does the 'J' suffix indicate in BD536J?

The 'J' suffix in BD536J denotes its h_FE gain bin: minimum DC current gain of 30, typical 40, and maximum 75 at V_CE = -2 V and I_C = -2 A. This binning enables predictable base drive design and facilitates matched-pair usage with complementary NPN devices like BD535, unlike the unbinned BD536 variant.

Can BD536J be used in parallel configurations?

BD536J can be operated in parallel for higher current handling, but requires emitter ballasting resistors (typically 0.1–0.5 Ω) to ensure current sharing due to h_FE and V_BE variations-even within Group J. Without ballasting, thermal runaway may occur. Layout symmetry and matched heatsinking are also essential to maintain balanced junction temperatures across paralleled BD536J units.

What is the safe operating area (SOA) limitation for BD536J at 100°C case temperature?

At T_C = 100°C, the BD536J's SOA is constrained by both second breakdown and thermal limits. Per the datasheet's Figure 3, maximum allowable collector current drops to approximately -3.5 A at V_CE = -30 V and to -1.2 A at V_CE = -60 V. Pulse operation (PW = 300 µs, duty cycle = 1.5%) extends these limits, but DC or high-duty-cycle designs must respect the derated SOA boundary to avoid destructive failure.