BD135 transistor - NPN bipolar, 45 V, 1.5 A, TO-220
BD135 transistor - NPN bipolar, 45 V, 1.5 A, TO-220
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Description
Product Overview
- Bipolar NPN transistor for switching applications up to 45 V reverse voltage
- Collector current up to 1.5 A, suitable for medium-load switching operations
- TO-220 package with high heat dissipation
- Current gain of approximately 40 to 250, depending on the operating point
- Three terminals, base, collector, and emitter, with standardized pinout
Product Description
The BD135 is a bipolar NPN transistor for building amplifier and switching circuits in prototypes and development projects. With a maximum reverse voltage of 45 V and an allowable collector current of up to 1.5 A, this transistor is particularly suitable for medium-power applications, such as driving relays, higher-power loads, or amplifying signals.
The transistor functions as a controlled current source between the collector and emitter, with a small base current switching on the significantly larger collector current. The TO-220 package with mounting hole allows heat to be dissipated through a heat sink if operating conditions require higher power dissipation. As a switch, the transistor operates with positive control signals applied to the base.
Typical applications include driving high-brightness LEDs using PWM signals from microcontroller boards, switching 12 V motor controllers with logic outputs, or using the transistor as a driver for stronger relay coils. In amplification mode, the transistor can be used for bias regulation or signal conditioning. Its current gain of approximately 40 to 250, depending on the operating point, requires sufficient base current during switching for reliable turn-on. A series resistor at the base and, for inductive loads, a protection diode at the collector are common measures for safe operation.
The base, collector, and emitter terminals follow the standard pinout of the TO-220 package; the exact arrangement is specified in the datasheet. Operating and dimensioning the transistor requires familiarity with analog or digital circuits, as well as calculating series resistors for the base current.
Safety Notice
This product is a semiconductor component for building prototypes and test circuits. It is not intended for installation in household electrical circuits. Work on or near electrical installations must be carried out by qualified electricians; if in doubt, consult a qualified electrician before setup.
Scope of Delivery
- 1x BD135 - Bipolar NPN transistor, 45V, 1.A