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2SD822 Datasheet – 600V, 7A, NPN, TO-3 – Toshiba

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This NPN transistor is a type of bipolar junction transistor (BJT) that consists of two n-type semiconductor materials separated by a single p-type material.

Part Number: 2SD822, D822

Function: 600V, 7A, NPN Transistor

Package: TO-3 Type

Manufacturer: Toshiba

Image:

Description

This is 1500V, Silicon NPN transistor. The 2SD822 is a bipolar junction transistor (BJT) designed for general-purpose amplifier and switching applications.  It is optimized for high-voltage switching, fast transition times, and robust operation under inductive load conditions.

Features of 2SD822

1. High collector-base voltage capability (VCBO = 1500V)

2. ow collector-emitter saturation voltage

3. High-speed switching

4. Glass Passivated Collector-Base Junction.

Pinout

2SD822

Absolute Maximum Ratings (Ta = 25 °C)

Parameter Symbol Value Unit
Collector-Base Voltage VCBO 1500 V
Collector-Emitter Voltage VCEO 600 V
Emitter-Base Voltage VEBO 5 V
Collector Current IC 7 A
Emitter Current IE -7 A
Power Dissipation (Tc = 25°C) PC 50 W
Junction Temperature Tj 150 °C
Storage Temperature Tstg -55 to 150 °C

Electrical Characteristics

2SD822 Datasheet PDF

Advantages

1. High current gain makes it suitable for use in low-power amplifier circuits.

2. Low collector-emitter saturation voltage reduces power dissipation and improves efficiency in switching applications.

Application

  • CRT horizontal deflection output stage
  • Flyback transformer driver circuits
  • High-voltage pulse generators
  • Switching power stages with inductive loads

2SD822 Datasheet PDF

2SD822 pdf

MQ6 PDF Datasheet – GAS Sensor ( MQ-6 )

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This post explains for the sensor. The MQ-6 gas sensor is a semiconductor-type sensor that detects flammable gases such as LPG, propane, and butane. Its sensing element is based on tin dioxide (SnO₂), whose conductivity increases when exposed to combustible gases.

The Part Number is MQ6.

The function of this semiconductor is GAS SENSOR.

The package is module type.

Manufacturer: HANWEI ( www.hwsensor.com )

Preview images:

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MQ6 GAS Sensor

Description

Sensitive material of MQ6, MQ-6 gas sensor is SnO2, which with lower conductivity in clean air. When the target combustible gas exist, The sensor’s conductivity is more higher along with the gas concentration rising. Please use simple electrocircuit, Convert change of conductivity to correspond output signal of gas concentration.

Features

1. High sensitivity to LPG, iso-butane, propane

2. Small sensitivity to alcohol, smoke.

3. Fast response

4. Stable and long life

5. Simple drive circuit

 

Electrical & Mechanical Characteristics

Parameter Typical Value
Operating Voltage 5 V ± 0.1 V
Heater Voltage (VH) 5 V ± 0.2 V (AC/DC)
Load Resistance (RL) 4.7 kΩ ~ 47 kΩ (external)
Heater Resistance (RH) 31 Ω ± 3 Ω (room temp)
Heater Power ≈ 900 mW
Preheat Time > 24 hours (for first use)
Standard Detecting Range 300 – 10,000 ppm (LPG, butane, propane)
Sensitivity (Rs/R0) 2 ~ 20 (in 1000 ppm LPG)

 

SENSITVITY ADJUSTMENT:

Resistance value of MQ-6 is difference to various kinds and various concentration gases. So, When using this components, sensitivity adjustment is very necessary. we recommend that you calibrate the detector for 1000ppm of LPG concentration in air and use value of Load resistance ( RL) about 20KΩ(10KΩ to 47KΩ). When accurately measuring, the proper alarm point for the gas detector should be determined after considering the temperature and humidity influence.

 

MQ6 pdf datasheet

 

Advantages and Limitations

Advantages:

  • Low cost, easy integration with microcontrollers (Arduino, STM32, etc.)

  • Good sensitivity to LPG/butane/propane

  • Fast response

Limitations:

  • Requires long preheating time (≥24h initially, a few minutes on subsequent uses)

  • Cross-sensitivity to alcohols, hydrogen, and smoke (not perfectly selective)

  • Analog output requires calibration for accurate ppm readings

  • Heater consumes relatively high power (~800–900 mW)

Applications

They are used in gas leakage detecting equipments in family and industry, are suitable for detecting of LPG, iso-butane, propane, LNG, avoid the noise of alcohol and cooking fumes and cigarette smoke.

 

MQ6 PDF Datasheet