1N4744A R1G

Overview

The Taiwan Semiconductor 1N4744A R1G is a silicon planar Zener voltage regulator diode housed in the DO-41 (DO-204AL) axial leaded package. It provides a nominal Zener voltage of 15 V with a tolerance of ±5%. The device supports a maximum steady-state power dissipation of 1 W at temperatures up to 50°C, requiring derating above this threshold. Key electrical characteristics include a maximum reverse leakage current of 5 µA and a Zener impedance of 14 Ω measured at a test current of 17 mA. The component operates within an extended temperature range from -65°C to +200°C.

Feature Summary

• Hermetically sealed glass construction using double slug type metallurgical bonding for enhanced reliability
• Oxide passivated die design ensuring corrosion resistance on all external surfaces
• Tin-lead solder finish providing high-temperature soldering capability up to 260°C

Applications

• Precision voltage regulation in industrial control systems
• Overvoltage protection circuits for sensitive electronic components
• Reference voltage sources in measurement instrumentation

Procurement Notes

Verify the specific suffix configuration against the manufacturer's datasheet to ensure compatibility with required environmental standards. Confirm that the hermetic sealing and metallurgical bond specifications align with the intended application's reliability requirements. Check for RoHS compliance status if restricted substances are prohibited in the manufacturing process.

Selection Notes

Select this component when a robust, hermetically sealed Zener diode is required for high-reliability applications. The DO-41 package offers through-hole mounting convenience suitable for general-purpose circuit boards. Ensure the 1 W power rating and 200°C maximum operating temperature meet the thermal management constraints of the target system environment.

Part Context

This part belongs to the 1N47xx series of 1 Watt Zener Voltage Regulators manufactured by Taiwan Semiconductor. The series utilizes silicon planar technology and is available in various voltage ratings ranging from 3.3 V to 100 V. The 1N4744A variant specifically targets the 15 V regulation segment within this standardized product line.

Replacement Considerations

Cross-reference with other manufacturers' 1N4744A equivalents such as Vishay or Microchip Technology. Verify that substitute parts maintain the same DO-41 package dimensions, 1 W power rating, and 15 V Zener voltage tolerance to ensure mechanical and electrical interchangeability.