Question 1

What are the key features of STMicroelectronics BD138?

EZKEY · Accepted Answer

This product belongs to the Bipolar Transistors - BJT category and ships in standard packaging. It features high reliability, stable performance and low power consumption. Key parameters include wide operating range, low loss, and over-temperature protection, suitable for industrial applications. Manufactured by STMicroelectronics with full traceability.

Question 2

What are the main application scenarios for BD138?

EZKEY · Accepted Answer

Typical applications include power management, industrial control. Additionally, it is widely used in automotive electronics, telecom infrastructure, medical devices, and consumer electronics as a critical circuit component, improving system integration and energy efficiency.

Question 3

How does BD138 work?

EZKEY · Accepted Answer

This device follows established Bipolar Transistors - BJT design principles. Core functional stages include input handling, signal and power processing, and protection logic, ensuring stable operation under varying conditions. Refer to the datasheet for the detailed characteristics and application guidance.

Question 4

What is the technical performance of BD138?

EZKEY · Accepted Answer

Performance highlights: stable characteristics across the operating temperature range, low loss, and long service life. Reliable contact and shock resistance, with protection against over-current and over-voltage where applicable. Meets industrial and automotive reliability standards where the series qualifies.

Question 5

What is the current market demand for BD138?

EZKEY · Accepted Answer

The global Bipolar Transistors - BJT market is growing at ~6-8% CAGR, with particularly strong demand in power management. STMicroelectronics BD138 is a mainstream model with stable stock and a typical lead time of 2-4 weeks. Driven by new energy and smart electronics trends, inquiries for this model are steadily increasing, indicating a positive long-term outlook.

Question 6

What are the technical characteristics of BD138?

EZKEY · Accepted Answer

Three main technical features: 1) High reliability – stable performance over the rated life; 2) Low-loss design – reduced energy loss in operation; 3) Wide adaptability – compatible with various operating conditions. Additionally, STMicroelectronics provides full technical support and reference designs.

Collector Current	1.5 A
Collector Emitter Saturation Voltage	0.5 V max
Configuration	Single
Hfe	hFE 40-250
Mounting Style	Through Hole
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ +150°C
Package Type	TO-126
Polarity	PNP
Power Dissipation	12.5 W
RoHS	Compliant
Temperature Range	-65 to +150 C
Transistor Type	BJT
Transition Frequency	10 MHz typical
Vceo	60 V

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BD138 | STMicroelectronics TRANS PNP 60V 1.5A BIPO TO-252AA

Product Details

PDF Datasheet

Technical Docs

Technical Parameters

BD138 Application and Selection Guide

BD138 Model and Manufacturer Information

BD138 Product Parameters and Description

BD138 Application and Selection Reference

Recommended Part Numbers for BD138