onsemi BD14010STU

Overview

BD14010STU from Fairchild Semiconductor is a PNP epitaxial silicon transistor in TO-126 package, rated for −80 V V_CEO, −1.5 A continuous collector current, and 12.5 W case power dissipation at T_C = 25°C, used in medium-power linear amplification and switching applications such as audio output stages and relay drivers.

For engineers reviewing the BD14010STU datasheet, pinout, applications, or equivalent options, key selection criteria include its −80 V breakdown rating, h_FE range of 100–250 at I_C = −150 mA, V_CE(sat) ≤ −0.5 V at I_C = −500 mA / I_B = −50 mA, thermal derating behavior, and complementary pairing with BD139.

Technical Context

This PNP bipolar junction transistor operates in active, saturation, and cutoff regions with defined DC current gain classes (h_FE3: 100–250), specified sustaining voltage (V_CEO(sus) = −80 V), and low saturation voltage enabling efficient switching in medium-current loads.

Its thermal design requires attention to case temperature limits (T_J = 150°C max) and power derating above 25°C - PC drops linearly to zero at T_C = 175°C - and it exhibits stable cutoff characteristics with I_CBO ≤ −0.1 µA and I_EBO ≤ −10 µA.

Key Specifications

Pinout & Package

BD14010STU uses the TO-126 plastic power package with standardized 3-pin layout: Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base. The package features a metal tab (Pin 2) for mechanical mounting and thermal conduction to heatsink.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BD140 (identical function) and MJD127 (SMT alternative), BD14010STU offers verified h_FE binning, TO-126 mechanical stability, and legacy design continuity - making it optimal for through-hole industrial controls where thermal mass and serviceability matter.

Availability

BD14010STU is available at Aetrix Electronics and suitable for audio amplifiers, relay drivers, DC motor controllers, and linear regulator designs requiring stable component supply and long-term obsolescence management.

Supply support for BD14010STU 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 devices before its acquisition by ON Semiconductor in 2016.

BD14010STU belongs to Fairchild's legacy medium-power PNP transistor family designed for robust linear and switching operation in industrial, consumer, and automotive-qualified systems.

FAQ

What is the maximum collector-emitter voltage rating for BD14010STU?

The BD14010STU has a maximum collector-emitter voltage (V_CEO) rating of −80 V at T_C = 25°C. This rating applies under DC conditions and defines the upper limit for safe operation in common-emitter configuration without avalanche breakdown. Derating is required above 25°C case temperature per the published power derating curve.

Does BD14010STU have a specified h_FE range, and how is it binned?

Yes, BD14010STU is binned to h_FE3 class, with guaranteed DC current gain of 100–250 at V_CE = −2 V and I_C = −150 mA. This binning ensures consistent base drive requirements across units, supporting reliable design of amplifier bias networks and saturated switches without individual characterization.

What package type does BD14010STU use, and how is it mounted?

BD14010STU uses the TO-126 plastic power package with three leads: Pin 1 = Emitter, Pin 2 = Collector (metal tab), Pin 3 = Base. The metal tab (Pin 2) must be electrically isolated from the heatsink using mica or silicone washer unless circuit topology permits direct connection to collector potential.

Can BD14010STU replace BD140 in existing designs?

Yes, BD14010STU is a direct form-fit-function replacement for BD140, sharing identical absolute maximum ratings, electrical characteristics, TO-126 package dimensions, and pinout. The "10" suffix denotes h_FE bin 10 (100–250), so no layout or schematic changes are needed when substituting BD14010STU for standard BD140 in validated designs.

What is the safe operating area (SOA) limitation for BD14010STU at DC operation?

At DC operation, BD14010STU's safe operating area is bounded by I_C ≤ −1.5 A, V_CE ≤ −80 V, and P_C ≤ 12.5 W at T_C = 25°C. The SOA curve shows that simultaneous high voltage and high current are restricted - e.g., at V_CE = −40 V, maximum continuous I_C is ~0.7 A - to prevent second breakdown and thermal runaway.