NTE248 PNP Darlington Transistor for Power Amplifier Applications

ElecSuppliers Part Number GuideSep 06, 2026

NTE248 is a silicon PNP Darlington transistor from NTE Electronics designed for power amplification and low-frequency switching applications. With a 100V collector-emitter sustaining voltage, 12A collector current capability and 150W power dissipation rating, the device is intended for circuits that require substantial current gain and power-handling capability.

The NTE248 uses a traditional TO-3 metal package, making it suitable for designs where thermal performance and mechanical robustness are important considerations.

High-Gain PNP Darlington Configuration

NTE248 uses a PNP Darlington configuration that combines two transistor stages internally to provide high current gain. This allows a relatively small base current to control a considerably larger collector current.

The device has a high DC current gain, with a typical hFE of around 3500 under specified operating conditions. This characteristic makes NTE248 useful in power amplifier circuits and other applications where high current gain is required.

The Darlington structure can also simplify the drive circuitry compared with using a conventional single bipolar power transistor.

100V Collector-Emitter Rating

NTE248 provides a minimum collector-emitter sustaining voltage of 100V. This voltage rating gives designers flexibility when developing higher-voltage transistor amplifier and switching circuits.

The transistor supports collector currents up to 12A under the specified conditions. When selecting the device for a particular circuit, the actual operating current, voltage, switching conditions and thermal environment should be evaluated together rather than relying on the maximum ratings alone.

150W Power Dissipation Capability

Power dissipation is an important characteristic of NTE248. The device is rated for up to 150W power dissipation under appropriate thermal conditions.

Because power transistors can generate significant heat during operation, the TO-3 package can be combined with an appropriate heatsink to maintain the junction temperature within its specified limits.

The available thermal design has a direct effect on the usable current and power levels of the transistor in an actual circuit.

TO-3 Metal Package

NTE248 is supplied in a TO-3 package. The metal package provides a mechanically robust construction and supports heat transfer from the transistor to an external heatsink.

The collector is connected to the metal case, so PCB layout, mounting hardware and electrical isolation should be considered carefully when installing the device.

The TO-3 format is also useful for replacement and repair applications because it has been widely used in older power amplifier, industrial control and electronic equipment designs.

Power Amplifier Applications

NTE248 was designed for general-purpose amplifier applications where high current gain and power handling are required.

The PNP Darlington configuration can be used in complementary power amplifier stages, output driver circuits and other analog designs requiring a high-current PNP transistor.

Its complementary relationship with NTE247, the corresponding NPN Darlington transistor, can also be useful when designing complementary push-pull amplifier circuits.

Low-Frequency Switching

In addition to amplification, NTE248 can be used for low-frequency switching applications. Its high current capability allows it to control relatively substantial loads when switching speed requirements are moderate.

Potential applications include power control stages, relay drivers, motor-related control circuits and legacy industrial electronics.

The device is intended for low-frequency operation rather than high-speed switching, so switching losses and storage effects should be considered when evaluating it for a switching design.

Electrical Characteristics for Circuit Design

NTE248 has a specified collector-emitter saturation voltage of up to 2.0V under a 6A collector-current test condition and up to 3.0V at 12A under the specified drive conditions.

The base-emitter saturation voltage can reach 4.0V at the higher current test condition. These characteristics are important when calculating transistor power dissipation and determining the required base-drive circuit.

For amplifier applications, designers should also consider the transistor's gain variation, frequency response and thermal characteristics across the expected operating range.

NTE248 in Legacy Equipment and Replacement Designs

The TO-3 package and high-power Darlington configuration make NTE248 particularly relevant to maintenance and replacement applications involving older electronic equipment.

When replacing an existing power transistor, engineers should compare voltage rating, collector current, power dissipation, gain, pin configuration and thermal requirements rather than selecting a replacement based only on the transistor type.

NTE248 can be considered for general-purpose PNP Darlington applications where its electrical ratings and mechanical package match the original circuit requirements.

A High-Current PNP Darlington Solution

With its 100V collector-emitter rating, 12A collector current capability, 150W power dissipation and high current gain, NTE248 remains a practical option for power amplification and low-frequency switching circuits.

Its TO-3 metal package is especially relevant to applications that require effective heatsinking and compatibility with established through-hole power transistor designs. For amplifier repair, industrial electronics and other legacy hardware, NTE248 provides a combination of high gain and substantial power-handling capability in a familiar package.