2SA1943 PNP Transistor – Datasheet

Introduction

The 2SA1943 is a widely used PNP power transistor, a key component in audio frequency amplifiers and high-power audio circuits. It’s designated as a power transistor due to its robust electrical characteristics, which include a high collector-to-emitter breakdown voltage of -230V and a substantial collector current of -15A. Its strong output gain of up to -160 further solidifies its role in demanding amplification applications.

Originally manufactured by Toshiba, the 2SA1943 is now considered a legacy component, having been largely superseded by the more cost-effective and modern TTA1943 transistor. Despite this, many other manufacturers continue to produce 2SA1943 equivalents, making it readily available for repair or new builds through various online distributors.

2SA1943 PNP Transistor Pinout

The 2SA1943 is famously the complementary counterpart to the 2SC5200 NPN transistor. Because they share nearly identical specifications, they are frequently paired together in a push-pull configuration to build efficient and high-fidelity audio amplifier circuits. This complementary pairing is a classic design choice in audio electronics, allowing for the powerful amplification of both the positive and negative cycles of an audio signal.

2SA1943 PNP Transistor Key Features

• High Current Capability: IC = -17A.
• High Power Dissipation : 150watts.
• High Frequency : 30MHz.
• High Voltage : VCEO= -250V
• Wide S.O.A for reliable operation.
• Excellent Gain Linearity for low THD.
• Complement to 2SC5200/FJL4315.
• Full thermal and electrical Spice models are available.
• Same transistor is also available in:
— TO3P package, 2SA1962/FJA4213 : 130 watts
— TO220 package, FJP1943 : 80 watts
— TO220F package, FJPF1943 : 50 watts

2SA1943 PNP Transistor Specifications

More Circuit Layouts

Key Applications of the 2SA1943

The 2SA1943 PNP power transistor is a versatile component with a range of applications, primarily focused on high-power amplification and switching. Its most common use is in audio power amplifiers, often in a push-pull configuration alongside its complementary NPN transistor, the 2SC5200. This pairing is fundamental to building high-fidelity stereo systems and other audio amplifier circuits capable of delivering significant output power. Beyond audio, the 2SA1943 is also employed in general-purpose switching circuits, power supplies, and DC-to-AC inverters, where its ability to handle high current and voltage is critical.

Following are the key applications of this power transistor:

• 2SA1943 is used mainly in audio frequency amplifiers
• Used in radio frequency circuits as well.
• Switch-mode power supplies (SMPS)
• Relays
• Used with its complementary transistor in a push-pull configuration
• Power supply
• Switching a load with a high current rating
• Power amplifiers
• Inverters
• Converters
• Power control circuits
• DC to AC converters

Equivalent transistors

Transistors that are exactly similar or equivalent to 2SA1943 and can be replaced with it:

• TTA1943
• 2SA1962
• FJL421
• MJL1302A
• KTA1962

Datasheet of 2SA1943 PNP Transistor

Click the following Button below to download the datasheet of 2SA1943 PNP Transistor:

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