Transistor

D331 Transistor – 50V, 2A, NPN, Datasheet ( 2SD331 )

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Part Number: 2SD331

Function: 50V, 2A, NPN Transistor

Package: TO-220AA Type

Manufacturer: Sanyo Semicon Device

Images:D331 pdf transistor

Description

D331 is 50V, 2A, Silicon NPN Transistor. Especially suited for use in output stage of 10W AF Power amplifier. Especially suited for use in output stage of 10W AF Power amp.

Features

  • High collector-emitter voltage capability
  • Stable DC current gain over wide operating range
  • Good thermal characteristics for linear amplification
  • Especially suited for 10W AF power amplifier output stages

Absolute maximum ratings ( Ta=25°C )

1. Collector to Base Voltage: Vcbo = 50 V

2. Collector to Emitter Voltage: Vceo = 50 V

3. Emitter to Base Voltage: Vebo = 5 V

4. Collector Current: Ic = 2 A

5. Collector Dissipation : Pc = 20 W

6. Junction Temperature: Tj = 150°C

7. Storage Temperature: Tsg = -55 ~ +150°C

Applications

  • 10W AF power amplifiers
  • Small speaker driver circuits
  • Audio pre-driver and buffer stages
  • General-purpose power control circuits

D331 PDF Datasheet

D331 pdf

7808 Transistor – 8V, 1.5A, Voltage Regulator ( PDF )

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Part Number: 7808

Function: Three Terminal Positive Voltage Regulator ( 8V )

Pacakge : TO-220 Type

Manufacturer: Inchange Semiconductor

Image

7808 pdf datasheet

Description

The 7808 is a fixed 8V three-terminal positive linear voltage regulator designed for stable DC power supply applications, commonly packaged in TO-220. It provides reliable voltage regulation with built-in protection features and consistent output performance across varying conditions. This regulator is widely used in power supplies, embedded systems, and analog circuits requiring a steady 8V rail.

Features

  • Fixed output voltage of 8V
  • Output current capability exceeding 1.5A
  • Internal thermal overload protection
  • Output transition safe-area compensation
  • Short-circuit current limiting protection
  • Low lot-to-lot variation for consistent performance

Absolute Maximum Ratings (Tc = 25 °C)

Parameter Symbol Value Unit
Input Voltage VIN 35 V
Output Current IO 1.5 A
Power Dissipation Ptot Internally Limited –
Junction Temperature Tj 150 °C
Storage Temperature Tstg -65 to 150 °C

Pinout

7808 pdf pinout

Design Notes

  • Maintain input voltage at least 2V higher than output (dropout consideration)
  • Use input and output capacitors (e.g., 0.33µF and 0.1µF) for stability
  • Heat sinking is required for high current or high input-output voltage differential
  • Thermal shutdown protects the device under overload conditions
  • Ensure proper PCB layout to minimize noise and improve regulation

Typical Circuit Usage

  • Linear regulated power supply stages
  • Microcontroller and logic circuit power rails
  • Analog signal conditioning circuits
  • Battery-powered systems requiring regulated 8V output
  • Post-regulation after DC-DC converters

How to Choose This Part

  • Select when a fixed 8V output is required with simple implementation
  • Ideal for low-noise analog applications compared to switching regulators
  • Ensure thermal design is adequate for power dissipation
  • Use when input voltage is within safe operating limits
  • Not suitable for high-efficiency designs due to linear regulation losses

Applications

  • Power adapters and regulated DC supplies
  • Embedded systems and development boards
  • Audio and instrumentation circuits
  • Industrial control systems
  • Consumer electronics power regulation

Alternative / Equivalent Products

  • LM7808 (standard 8V regulator)
  • L7808 (STMicroelectronics equivalent)
  • KA7808 (Fairchild equivalent)
  • UA7808 (Texas Instruments version)
  • LM317 (adjustable voltage regulator alternative)

[…]

7808 PDF Datasheet