Product Overview
Sanken Electric 2SA1859A High-Voltage Bipolar Power Transistor for Audio Amplifiers
Condition
Unused new old stock (NOS). Straight, untrimmed through-hole leads with clean body surfaces. Markings legible: SK A1859A 33 Y.
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Product Overview
Engineered for high-voltage audio driver stages, Sanken 2SA1859A is a silicon PNP planar power transistor delivering -180V breakdown ratings and 2A collector current. The fully isolated TO-220F plastic package mounts directly to a heatsink without requiring mica insulators or silicone pads.
Key Features
- Transistor Polarity: PNP Bipolar Junction Transistor (BJT)
- Collector-Emitter Breakdown Voltage (VCEO): -180 V
- Continuous Collector Current (IC): -2.0 A
- Collector Power Dissipation (PC): 20 W with heatsink at 25°C case temperature
- Transition Frequency (fT): 60 MHz typical
- DC Current Gain (hFE): Rank Y (100 to 200)
- Package Type: Fully plastic-encapsulated TO-220F (FM20) through-hole
Applications
- Driver and pre-driver stages in solid-state audio power amplifiers
- Bench restoration and repair of vintage high-fidelity audio equipment
- High-voltage linear driver circuits and analog amplification projects
Frequently Asked Questions
What is the pin configuration for the 2SA1859A?
Viewing the front face with markings visible and leads pointing down, the pinout from left to right is Pin 1: Base, Pin 2: Collector, Pin 3: Emitter.
What is the complementary NPN device for this transistor?
The complementary NPN transistor is the Sanken 2SC4883A.
Does the TO-220F package require an external insulating washer when mounted?
No. The TO-220F package is fully encapsulated in plastic, providing internal electrical isolation between the mounting surface and the collector tab.
Finding authentic Japanese silicon for a classic audio output stage beats rolling the dice on questionable substitutes. Drop it in, set the bias, and let the amplifier sing like it was meant to.
