Transistor 2SA721 PNP, 0.1A TO-92

Transistor 2SA721 PNP, 0.1A TO-92

Transistors

Reference: TR2SA721

Part.No: 2SA721

€1.20

Last items in stock

Immediate Dispatch

The 2SA721 is a PNP silicon epitaxial planar transistor (BJT) in a TO-92 package. Designed for low-level and general-purpose amplification thanks to its very high current gain (hFE ≥ 800).

Add to cart

Subscribe To When In Stock

You have successfully subscribed to this product

Description
Product Details

2SA721 PNP Transistor - High-Gain Small Signal Amplifier

The 2SA721 is a Japanese-origin PNP silicon epitaxial planar transistor in the compact TO-92 package, built specifically for low-level signal amplification stages. Its standout feature is an exceptionally high minimum hFE of 800, which makes it well suited for driving weak signals from sensors or microphone-level audio stages where extra gain is needed from a single device.

Functions & Applications

Very High Current Gain (hFE ≥ 800): Delivers strong amplification from a single small-signal stage.
Silicon Epitaxial Planar Construction: Stable and reliable performance across the operating temperature range.
Compact TO-92 Package: Easy through-hole mounting on breadboards and prototype PCBs.
35V Vce Rating: Enough headroom for typical low-power audio and general-purpose amplifier circuits.
250MHz Transition Frequency: Good enough bandwidth for audio-frequency and general small-signal applications.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	PNP
Package / Case	TO-92
Collector-Emitter Voltage (Vceo)	35V
Max Collector Current (Ic)	100mA
Power Dissipation (Pc)	150mW
DC Current Gain (hFE min)	800
Transition Frequency (ft)	250MHz
Mounting Type	Through-Hole (THT)

Frequently Asked Questions

Q: What is the 2SA721 typically used for?
A: It is intended for low-level and general-purpose amplification stages, such as small-signal audio preamps or sensor signal conditioning, where its very high hFE (min. 800) provides extra gain.

Q: What is the maximum current and voltage the 2SA721 can handle?
A: It is rated for a maximum collector current of 100mA and a maximum collector-emitter voltage of 35V, so it is only suitable for low-power, small-signal circuits.

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: PNP
Transistor Case Style: TO-92

16 other products in the same category:

Transistor BF255 NPN, RF/FM TO-92

Transistors

Transistor BF255 NPN, RF/FM TO-92

Reference:

TRBF255

The BF255 is a high-frequency NPN BJT transistor in a TO-92 package, specifically optimized for RF and FM applications. Designed for low-noise amplification and mixing around 100MHz, it is ideal for FM front-end circuits, oscillators, and amateur radio projects.

In Stock

Power Transistor 2SD525 NPN, 5A TO-220

Transistors

Power Transistor 2SD525 NPN, 5A TO-220

Reference:

TR2SD525

The 2SD525 is a high-current NPN power transistor in a TO-220 package. Designed for motor driving, amplification stages, and power switching applications requiring robust performance at medium voltage and high collector current.

In Stock

Transistor AF106 PNP, VHF Germanium TO-72

Transistor AF106 PNP, VHF Germanium TO-72 2

Transistors

Transistor AF106 PNP, VHF Germanium TO-72

Reference:

TRAF106

The AF106 is a PNP Germanium BJT in a TO-72 package, purpose-built for VHF/UHF tuning circuits. A classic component for vintage television and FM radio restoration, prized for its excellent high-frequency performance in oscillators and RF mixers.

In Stock

Transistor BC328

Transistors

Transistor BC328 PNP, 50mA TO-92

Reference:

TRBC328

The BC328 is a reliable PNP Bipolar Junction Transistor (BJT) in a TO-92 package. Designed for small-signal amplification and low-power switching applications in audio circuits, sensor interfaces, and general-purpose DIY electronics.

In Stock

Transistor AF114 PNP Germanium, TO-7

Transistors

Transistor AF114 PNP Germanium, TO-7

Reference:

TRAF114

The AF114 is a classic PNP germanium transistor in a TO-7 can package with 4 leads (including shield). Legendary for RF and IF stages in vintage European radios and receivers, prized by restoration enthusiasts and vintage radio collectors.

Last items in stock

Power Transistor BD250 PNP, 12A TO-247

Transistors

Power Transistor BD250 PNP, 12A TO-247

Reference:

TRBD250

The BD250 is a high-power PNP Bipolar Junction Transistor (BJT) in a TO-247 package. Engineered for professional audio amplifiers, switching applications, and demanding current loads up to 12A. Complementary pair to the NPN BD249.

Last items in stock

Transistor BD227 PNP, 45 V, 1.5 A, TO126

Transistors

Transistor BD227 PNP, 1.5A TO-126

Reference:

TRBD227

The BD227 is a PNP Bipolar Junction Transistor (BJT) rated for 45V / 1.5A, housed in a TO-126 package. Commonly used as a driver or complementary output stage transistor in audio amplifiers and general-purpose power switching circuits.

Last items in stock

Power Transistor BD441 NPN, 10A TO-126

Transistors

Power Transistor BD441 NPN, 10A TO-126

Reference:

TRBD441

The BD441 is a medium-power NPN Bipolar Junction Transistor (BJT) in a TO-126 package. Engineered for robust switching and audio driver applications requiring higher voltage tolerance and efficient heat dissipation.

Last items in stock

Power Transistor BU208D NPN, 15A TO-3

Transistors

Power Transistor BU208D NPN, 15A TO-3

Reference:

TRBU208D

The BU208D is a high-voltage NPN power transistor in a TO-3 package, designed for Line Output (LOPT) switching in television deflection circuits. The integrated snubber diode and base-emitter resistor make it a complete, ready-to-use solution for demanding high-frequency switching applications.

Last items in stock

Transistor ASZ21 PNP Germanium Switching

Transistors

Transistor ASZ21 PNP Germanium Switching

Reference:

TRASZ21

The ASZ21 is a PNP Germanium transistor, specifically designed for high-speed switching operations.

Last items in stock

Transistor AF186 PNP Germanium, UHF TO-72

Transistor AF186 PNP Germanium, UHF TO-72 2

Transistors

Transistor AF186 PNP Germanium, UHF TO-72

Reference:

TRAF186

The AF186 is a PNP Germanium BJT in a TO-72 metal can package, purpose-built for UHF RF amplification in vintage television tuners and radio receivers. A classic component from the golden age of analog electronics.

In Stock

Transistor BF758 NPN, 0.5A TO-202

Transistors

Transistor BF758 NPN, 0.5A TO-202

Reference:

TRBF758

The BF758 is a high-voltage NPN Bipolar Junction Transistor (BJT) in a TO-202 package, rated for up to 300V. It was originally designed as a video/line output transistor for the cathode board of CRT televisions and computer monitors.

In Stock

Transistor 2SC1417 NPN, 0.2A TO-92

Transistors

Transistor 2SC1417 NPN, 0.2A TO-92

Reference:

TR2SC1417

The 2SC1417 is an NPN Bipolar Junction Transistor (BJT) in a TO-92 package, optimized for high-frequency (VHF) and RF applications. Perfect for oscillators, RF amplifiers, and frequency-dependent circuit designs where switching speed and gain stability matter.

In Stock

Transistor 2SC1855 NPN, TO-92

Transistors

Transistor 2SC1855 NPN, TO-92

Reference:

TR2SC1855

The 2SC1855 is a high-frequency NPN Bipolar Junction Transistor (BJT) in a TO-92 package. Optimized for VHF oscillators, RF amplifiers, and small-signal switching applications requiring excellent frequency response.

In Stock

Power Transistor 2SD330 NPN, 2A TO-220

Transistors

Power Transistor 2SD330 NPN, 2A TO-220

Reference:

TR2SD330

The 2SD330 is a robust NPN power transistor in a TO-220 package. Optimized for high-current switching and amplification in motor drivers, audio amplifiers, and industrial control circuits.

Last items in stock

Transistor BC157 PNP 45 V 100 mA 300 mW SOT-25

Transistors

Transistor BC157 PNP, 100mA SOT-25

Reference:

TRBC157

The BC157 is a general-purpose PNP Bipolar Junction Transistor (BJT) in a SOT-25 package. Suited for small-signal amplification and low-power switching in analog and digital hobby circuits.

In Stock

Product added to wishlist

Product added to compare.