onsemi BD1396S

Overview

BD1396S from Fairchild Semiconductor is an NPN epitaxial silicon transistor in TO-126 package, rated for 80 V V_CEO, 1.5 A DC collector current, and 12.5 W collector dissipation at T_C=25°C; used in medium-power linear amplification and switching applications such as audio output stages and power supply regulators.

For engineers reviewing the BD1396S datasheet, pinout, applications, or equivalent options, key selection criteria include V_CEO/V_CBO rating, hFE classification (100–250 at I_C=150 mA), V_CE(sat) ≤0.5 V, thermal derating behavior, and complementary pairing with BD140.

Technical Context

This discrete NPN bipolar junction transistor operates in active, saturation, and cutoff regions with defined safe operating area (SOA) limits. Its hFE is specified across three test conditions-25–250 at I_C=5 mA, 25–160 at I_C=0.5 A, and 100–250 at I_C=150 mA-enabling predictable gain control in both small-signal and medium-current switching designs.

V_CE(sat) = 0.5 V at I_C=500 mA / I_B=50 mA confirms low conduction loss in saturated switch mode, while V_BE(on) = 1.0 V at I_C=0.5 A supports standard TTL-compatible base drive. Junction temperature limit of 150°C and storage range of –55°C to +150°C define its thermal envelope for industrial ambient operation.

Key Specifications

Pinout & Package

BD1396S is housed in a TO-126 plastic package with standardized lead configuration: Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base. The package features a metal tab for mechanical mounting and thermal conduction to heatsinks.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN medium-power switching and linear amplification applications.

Compared with BD139 (identical function) and MJD13005 (higher-rated but non-pin-compatible), BD1396S offers optimized gain linearity and thermal response for cost-sensitive 80 V/1.5 A applications where TO-126 form factor and legacy design continuity matter.

Availability

BD1396S is available at Aetrix Electronics and suitable for audio power amplifiers, linear voltage regulators, and DC motor drivers requiring stable component supply and long-term industrial availability.

Supply support for BD1396S 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.

The BD1396S belongs to Fairchild's legacy BD135/137/139 NPN transistor family, designed specifically for medium-power linear and switching applications including audio output stages, regulator pass elements, and industrial control interfaces.

FAQ

What is the pin configuration of BD1396S?

The BD1396S uses a standard TO-126 package with Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base. This configuration is consistent across the BD135/137/139 family and verified in Fairchild's February 2000 datasheet Rev. A. Mounting orientation places the emitter lead closest to the tab edge, enabling correct PCB layout alignment for thermal and electrical routing in BD1396S-based designs.

Is BD1396S electrically identical to BD139?

Yes, BD1396S is a manufacturer-marked variant of the BD139 transistor. All absolute maximum ratings, electrical characteristics-including V_CEO=80 V, I_C=1.5 A, hFE=100–250 at I_C=150 mA-and package dimensions match the BD139 specification in Fairchild's official documentation. No performance or reliability differences exist between BD1396S and BD139.

What is the maximum safe continuous collector current for BD1396S?

The BD1396S has a DC collector current rating of 1.5 A at T_C=25°C. Operation above this value requires derating based on case temperature per the power derating curve in the datasheet. At T_C=100°C, the usable I_C drops to approximately 0.6 A. Exceeding 1.5 A continuously without thermal management risks junction overheating and permanent failure of the BD1396S.

Can BD1396S be used as a direct replacement for BD135 or BD137?

No-BD1396S corresponds exclusively to the BD139 variant (V_CEO=80 V, V_CBO=80 V). BD135 (45 V) and BD137 (60 V) have lower voltage ratings and distinct hFE classifications. Substituting BD1396S into a BD135/BD137 design may cause overvoltage stress in low-voltage circuits or alter bias points due to different gain profiles, so BD1396S must only replace BD139-designated positions.

Does BD1396S require a heatsink in typical applications?

Yes-BD1396S dissipates up to 12.5 W at T_C=25°C, but its 1.25 W rating at T_A=25°C means ambient-air operation is limited to ~100 mW. Any application drawing >200 mW continuously (e.g., linear regulator with >0.2 A × 0.5 V drop) requires a heatsink attached to the TO-126 metal tab. Thermal resistance from junction-to-case is 10°C/W, making heatsink selection critical for BD1396S reliability.