SD787

Product Overview

SD787 is commonly associated with the Hitachi Semiconductor 2SD787, a silicon NPN epitaxial transistor designed for low-frequency power amplifier and audio amplification applications. The device features high DC current gain, low saturation voltage and complementary operation with 2SB738/2SB739 PNP transistors. With a compact transistor package and reliable switching/amplification performance, SD787 is suitable for audio equipment, amplifier circuits, consumer electronics and legacy electronic repair applications. 

Key Features

• Manufacturer: Hitachi Semiconductor

• Part Number: SD787

• Full / Related Part Number: 2SD787

• Device Type: NPN Bipolar Junction Transistor (BJT)

• Product Category: Discrete Semiconductor / Transistor

• Transistor Polarity: NPN

• Technology: Silicon NPN Epitaxial

• Application Type: Low-frequency power amplifier

• Collector-Emitter Voltage: 16V

• Collector-Base Voltage: 20V

• Emitter-Base Voltage: 6V

• Collector Current: 2A

• Collector Power Dissipation: 0.9W

• DC Current Gain (hFE): 100 to 800

• Transition Frequency: 100MHz

• Collector Saturation Voltage: 0.3V typical

• Complementary Pair: Compatible with 2SB738 / 2SB739

• Mounting Type: Through-hole mounting

• Package Type: TO-126 style package

• Operating Temperature: Up to +150°C junction temperature

• Typical Use: Audio amplifiers, power amplifier stages, consumer electronics and replacement applications

• Ordering / Packaging Note: SD787 buyers should verify the complete part marking, manufacturer, package type, gain group, date code and electrical parameters before production use.

Applications

SD787 is mainly used in analog amplification circuits requiring reliable NPN transistor performance. Typical applications include low-frequency power amplifiers, audio output stages, complementary amplifier circuits, consumer audio equipment, industrial control circuits and maintenance replacement projects. Its complementary matching capability makes it suitable for push-pull amplifier designs. 

Quality & Sourcing

Antrex Electronics can support SD787 sourcing with stock availability checks, RFQ quotation, package confirmation, date code review and shipment arrangement. For project-based purchasing, buyers can provide quantity, target price, required date code, packaging requirements and application information for faster quotation support.

For quality control, Antrex Electronics can help arrange product photos, label review, visual inspection and third-party testing support when required. OEMs, EMS providers, repair centers and electronic component buyers are welcome to send BOM lists or hard-to-find part requests for sourcing assistance.