Transistor 2SD400 NPN, 1A TO-92

Transistor 2SD400 NPN, 1A TO-92

Transistors

Reference: TR2SD400

Part.No: 2SD400

€1.00

In Stock

Immediate Dispatch

The 2SD400 is a high-current NPN Bipolar Junction Transistor (BJT) in a TO-92 package. Designed for medium-power switching applications such as relay control and load switching in consumer electronics and hobby projects.

Add to cart

Subscribe To When In Stock

You have successfully subscribed to this product

Description
Product Details

2SD400 Medium-Power Transistor - Optimized for Relay Control & Switching

The 2SD400 is a robust NPN transistor capable of handling up to 1A collector current, making it a popular choice for switching relays, solenoids, and moderate-load applications. Its TO-92 package ensures straightforward integration into breadboards and PCBs, while its voltage rating and current capacity provide reliable performance in 12V and 24V control circuits.

Functions & Applications

High Collector Current (1A): Sufficient to drive relays, solenoids, and medium loads directly from microcontroller outputs.
Moderate Voltage Rating (Vceo 25V): Suitable for battery-powered and 12V/24V industrial control circuits.
Standard TO-92 Package: Through-hole design, breadboard-friendly, and easy to hand-solder.
Reliable Switching Performance: Established part with wide availability and proven field reliability.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-92
Collector-Emitter Voltage (Vceo)	25V
Max Collector Current (Ic)	1A
Mounting Type	Through-Hole (THT)

Frequently Asked Questions

Q: Can the 2SD400 drive a 12V relay directly?
A: Yes. With a maximum collector current of 1A, the 2SD400 can drive 12V relays with coil currents below 1A. Always use a flyback diode (1N4007 or similar) across the relay coil to protect against inductive spikes.

Q: What is the complementary PNP part for 2SD400?
A: The complementary PNP transistor is the 2SA400 or 2SA350, with similar electrical characteristics and TO-92 packaging.

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

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

16 other products in the same category:

Transistor BF167 NPN, Video/RF TO-72

Transistor BF167 NPN, Video/RF TO-72 2

Transistors

Transistor BF167 NPN, Video/RF TO-72

Reference:

TRBF167

The BF167 is an NPN Bipolar Junction Transistor (BJT) in a shielded TO-72 package, purpose-built for video intermediate frequency (IF) and automatic gain control (AGC) applications in vintage television receivers and RF circuits.

In Stock

Transistor AC127K NPN Germanium, 0.5A TO-1

Transistors

Transistor AC127K NPN Germanium, 0.5A TO-1

Reference:

TRAC127K

The AC127K is a germanium NPN transistor in a TO-1 heatsink-block package, designed for audio amplifier stages and vintage electronics repair where extra thermal stability is needed.

In Stock

Transistor BF251 NPN, 25mA TO-72

Transistors

Transistor BF251 NPN, 25mA TO-72

Reference:

TRBF251

The BF251 is a silicon NPN RF transistor in a TO-72 metal-can package, designed for intermediate frequency (IF) and RF amplification in AM/FM receivers, TV tuners and AGC stages.

Last items in stock

Transistor S8550

Transistors

Transistor S8550 PNP, 1.5A TO-92

Reference:

TRS8550

The S8550 is a PNP Bipolar Junction Transistor (BJT) in a TO-92 package, complementary to the popular S8050 NPN. Designed for class-B push-pull audio output stages, general amplification and medium-current switching in portable and battery-powered circuits.

In Stock

Dual-Gate MOSFET BF961 N-Channel TO-50

Transistors

Dual-Gate MOSFET BF961 N-Channel TO-50

Reference:

TRBF961

The BF961 is a Dual-Gate N-Channel MOSFET in a TO-50 package, designed for VHF/UHF RF applications. Gate 1 accepts the input signal while Gate 2 enables automatic gain control (AGC), making it ideal for radio amateur receivers and mixer circuits.

Last items in stock

Transistor 2SC1941 NPN, 0.15A TO-92

Transistors

Transistor 2SC1941 NPN, 0.15A TO-92

Reference:

TR2SC1941

The 2SC1941 is a high-voltage NPN Bipolar Junction Transistor (BJT) in a TO-92 package. Designed for video drivers, amplifiers and applications requiring robust voltage tolerance up to 160V.

Last items in stock

Transistor BF177 NPN, Video Output TO-39

Transistors

Transistor BF177 NPN, Video Output TO-39

Reference:

TRBF177

The BF177 is an NPN Bipolar Junction Transistor (BJT) in a TO-39 metal package, designed for high-voltage video output applications. Originally developed for CRT display deflection and electron beam control, the BF177 combines high breakdown voltage with stable performance at moderate frequencies.

In Stock

Transistor BC309 PNP, 20V, 100mA, 300mW, TO-92

Transistors

Transistor BC309 PNP, 100mA TO-92

Reference:

TRBC309

The BC309 is a PNP Bipolar Junction Transistor (BJT) in a TO-92 package, rated for 20V / 100mA / 300mW. Suited to small-signal amplification and low-power switching in general-purpose and educational circuits.

Last items in stock

Transistor 2N3906

Transistors

Transistor 2N3906 PNP, 0.2A TO-92

Reference:

TR2N3906

The 2N3906 is a widely used PNP Bipolar Junction Transistor (BJT) in a TO-92 package. Designed for general-purpose amplification and low-power switching, and often paired with its NPN complement, the 2N3904.

In Stock

Transistor BF858 NPN, 300V TO-202

Transistors

Transistor BF858 NPN, 300V TO-202

Reference:

TRBF858

The BF858 is an NPN high-voltage bipolar transistor in a TO-202 package, designed for video output amplifier stages in CRT televisions and monitors. It provides the high breakdown voltage needed to drive the RGB electron guns of the picture tube.

In Stock

Transistor ACY17 PNP, TO-5

Transistors

Transistor ACY17 PNP, TO-5

Reference:

TRACY17

The ACY17 is a PNP Germanium Transistor in a classic TO-5 metal package. A medium-power device ideal for vintage audio amplification, switching applications, and restoration of period electronic equipment.

Last items in stock

Transistor BF441 PNP, 0.5A TO-92

Transistors

Transistor BF441 PNP, 0.5A TO-92

Reference:

TRBF441

The BF441 is a PNP Bipolar Junction Transistor (BJT) in a TO-92 package, specifically designed for RF and high-frequency applications. With low internal capacitance and excellent frequency stability, it excels in oscillators, amplifiers, and telecommunications circuits.

In Stock

Transistor BF254 NPN, RF/IF Amplifier TO-92

Transistors

Transistor BF254 NPN, RF/IF Amplifier TO-92

Reference:

TRBF254

The BF254 is a classic NPN BJT in TO-92 package, purpose-designed for AM intermediate frequency (IF) amplification at 455 kHz. A trusted workhorse in vintage radio design and RF/IF signal processing.

In Stock

Transistor 2N1711

Transistors

Transistor 2N1748

Reference:

TR2N1748

Last items in stock

Power Transistor BD829 NPN, TO-220

Transistors

Power Transistor BD829 NPN, TO-220

Reference:

TRBD829

The BD829 is a robust NPN Power Bipolar Junction Transistor (BJT) in a TO-220 package. Engineered for audio amplifier driver and output stages, linear voltage regulators, and high-current switching applications where thermal management is critical.

In Stock

Transistor BC120

Transistors

Transistor BC120

Reference:

TRBC120

Το BC120 είναι ένα πυριτίου NPN Bipolar Junction Transistor (BJT) σε μεταλλική θήκη TO-39, με μέγιστο ρεύμα συλλέκτη 1A. Σχεδιασμένο ως τρανζίστορ εξόδου audio συχνοτήτων, ιδανικό για κλασικά κυκλώματα ενισχυτών.

In Stock

Product added to wishlist

Product added to compare.