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1N4705/TR
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Product Detailed Parameters
- Description：DIODE ZENER 18V 500MW DO204AH
- Series：-
- Mfr：Microchip Technology
- Package：Tape & Reel (TR)
- Voltage - Zener (Nom) (Vz)：18 V
- Tolerance：±5%
- Power - Max：500 mW
- Impedance (Max) (Zzt)：-
- Current - Reverse Leakage @ Vr：50 nA @ 13.6 V
- Operating Temperature：-65°C ~ 175°C (TA)
- Mounting Type：Through Hole
- Package / Case：DO-204AH, DO-35, Axial
- Voltage - Forward (Vf) (Max) @ If：1.1 V @ 200 mA
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Overview
The Microchip Technology 1N4705/TR is a silicon epitaxial planar Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 18V with a standard tolerance of 5%. The device operates within a power dissipation rating of 500mW and supports a maximum reverse current of 200mA. It is housed in a DO-35 axial leaded package, suitable for through-hole mounting. The component maintains functionality across an extended temperature range from -65°C to +175°C.
Feature Summary
- Utilizes silicon epitaxial planar technology for stable voltage regulation
- Provides precise voltage control with standard 5% tolerance at 18V
- Features hermetically sealed glass construction for environmental protection
Applications
- Voltage reference circuits requiring stable DC levels
- Overvoltage protection in sensitive electronic systems
- Clamping applications in signal processing paths
Procurement Notes
Verify the specific manufacturer source, as the 1N4705 designation is utilized by multiple semiconductor vendors including Microsemi and Central Semiconductor. Confirm that the actual datasheet aligns with the required electrical parameters, particularly the 500mW power rating and 18V Zener voltage, before finalizing procurement decisions.
Selection Notes
Select this component when a robust, low-current Zener regulator is needed for general-purpose voltage stabilization. Ensure the circuit design accommodates the 500mW thermal dissipation limits and the specific operating temperature range requirements. Verify compatibility with the DO-35 through-hole footprint during PCB layout.
Part Context
This part belongs to the broader family of 1N47xx series Zener diodes, which are widely used for basic voltage regulation tasks. The /TR suffix typically indicates tape and reel packaging for automated assembly processes. These components serve as fundamental building blocks in power supply designs and protection circuits.
Replacement Considerations
Cross-reference with other manufacturers' 1N4705 equivalents such as those from Central Semiconductor or Vishay. Ensure replacement parts match the 18V Zener voltage, 500mW power rating, and DO-35 package dimensions to maintain circuit integrity.
