Transistor 2SD879 NPN Darlington, TO-92

Transistor 2SD879 NPN Darlington, TO-92

Transistors

Reference: TR2SD879

Part.No: 2SD879

€1.20

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The 2SD879 is a high-gain NPN Darlington transistor in a TO-92 package. Engineered for applications requiring massive current amplification, such as relay drivers, motor control, and high-impedance signal switching.

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Description
Product Details

2SD879 NPN Darlington Transistor - Extreme Gain for Relay & Motor Driver Applications

The 2SD879 is a robust NPN Darlington transistor that delivers exceptional DC current gain, making it ideal for interfacing weak digital logic signals with high-current loads such as relays, solenoids, and small motors. Its Darlington configuration requires minimal base current to achieve full conduction, simplifying circuit design.

Functions & Applications

Extreme DC Gain (hFE): Requires minimal base current—ideal for direct MCU/logic output interfacing without additional driver stages.
Darlington Configuration: Two-stage internal structure delivers massive amplification, perfect for relay and solenoid switching.
Standard TO-92 Package: Through-hole, breadboard-friendly design for quick prototyping and integration.
High-Current Switching: Capable of driving heavy inductive loads with robust switching performance.

Technical Specifications

Parameter	Value / Specification
Transistor Type	Darlington
Polarity / Channel	NPN
Package / Case	TO-92
Max Collector-Emitter Voltage (Vceo)	90V
Max Collector Current (Ic)	500mA
Power Dissipation (Pd)	1000mW
Mounting Type	Through-Hole (THT)

Frequently Asked Questions

Q: What is the key difference between the 2SD879 and a standard NPN transistor?
A: The 2SD879 is a Darlington configuration—two transistors stacked internally—which delivers 1000× higher gain (hFE) than a single-stage device. This means you can drive heavy loads from a weak logic signal with almost no base current needed.

Q: Can the 2SD879 drive a 12V relay directly from an Arduino output pin?
A: Yes. With its extreme Darlington gain, the 2SD879 can be driven by 5V logic directly. However, always use a flyback diode (1N4007) across the relay coil to protect the transistor from inductive spikes.

Note: Price refers to one (1) piece. The component is shipped in bulk without individual packaging.

Transistor Type: BJT (Bipolar Junction Transistor)
Darlington
Transistor Polarity / Channel: NPN
Transistor Case Style: TO-92

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