onsemi BD13510S

Overview

BD13510S from Fairchild Semiconductor is an NPN epitaxial silicon transistor in TO-126 package, rated for 45 V V_CEO, 1.5 A continuous collector current, and 12.5 W case power dissipation at 25°C - used in medium-power linear amplification and switching circuits such as audio output stages and relay drivers.

For engineers reviewing the BD13510S datasheet, pinout, applications, or equivalent options, key selection criteria include V_CEO/V_CBO rating, hFE classification (40–100), saturation voltage at 500 mA/50 mA drive, thermal derating behavior, and complementary pairing with BD136.

Technical Context

This discrete NPN bipolar junction transistor operates in active, saturation, and cutoff regions with specified DC current gain (hFE) across three test conditions: 25–250 at IC = 5 mA, 25–160 at IC = 0.5 A, and 40–100 at IC = 150 mA. It features low V_CE(sat) of 0.5 V and V_BE(on) of 1.0 V under defined bias conditions.

The device exhibits a maximum junction temperature of 150°C and storage range from –55°C to +150°C. Its safe operating area (SOA) is defined for both pulsed (10 µs to 1 ms) and DC conditions, with power derating beginning at case temperatures above 25°C.

Key Specifications

Pinout & Package

BD13510S is housed in a TO-126 plastic package with standardized lead configuration: Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base. The package provides mechanical robustness and thermal path via the metal tab (Collector-connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BD13510S, BD135G offers identical performance with updated environmental compliance, while 2N3055 provides higher power handling at the cost of larger size and less predictable gain - making BD13510S optimal for space-constrained medium-power switching where gain consistency and thermal efficiency matter.

Availability

BD13510S is available at Aetrix Electronics and suitable for audio amplifier output stages, relay drivers, DC motor controllers, and linear regulator pass elements requiring stable component supply and long-term industrial availability.

Supply support for BD13510S 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 analog and discrete power devices, later acquired by ON Semiconductor in 2016.

The BD13510S belongs to Fairchild's legacy medium-power linear and switching transistor family, engineered for cost-sensitive industrial and consumer applications demanding reliable gain, thermal stability, and complementary PNP pairing.

FAQ

What is the pin configuration of BD13510S?

BD13510S uses a standard TO-126 package with Pin 1 = Emitter, Pin 2 = Collector (connected to metal tab), and Pin 3 = Base. This configuration is consistent across the BD135/137/139 series and verified in Fairchild's Rev. A datasheet. Mounting orientation must ensure electrical isolation of the tab unless Collector is referenced to chassis ground.

Is BD13510S RoHS compliant?

BD13510S is not explicitly marked RoHS-compliant in its original Fairchild documentation (Rev. A, 2000). For RoHS-compliant alternatives, BD135G is the designated green variant with identical electrical specifications and Pb-free construction. Always verify compliance status via current ON Semiconductor product advisories before high-volume deployment.

What is the hFE classification for BD13510S?

BD13510S is classified under hFE3 with a guaranteed range of 40–100 when measured at V_CE = 2 V and I_C = 150 mA. This classification ensures predictable base drive requirements in switching applications and stable gain in linear amplifiers - critical for designing repeatable bias networks in production hardware using BD13510S.

Can BD13510S be used as a direct replacement for BD135?

Yes - BD13510S is functionally identical to BD135, sharing the same absolute maximum ratings, electrical characteristics, TO-126 package, and pinout. The "10S" suffix reflects Fairchild's internal lot or revision coding and does not indicate specification deviation. Engineers may substitute BD13510S for BD135 without circuit or layout changes.

What thermal derating applies to BD13510S?

BD13510S has a linear thermal derating slope of 0.1 W/°C above T_C = 25°C, reducing maximum allowable power dissipation from 12.5 W to zero at T_C = 150°C. This requires heatsink sizing based on ambient temperature, airflow, and PCB copper area - especially critical in enclosed audio amplifier enclosures where BD13510S operates near its SOA limits.