1N4748A-TP

Overview

The MCC 1N4748A-TP is a silicon planar Zener diode housed in a hermetically sealed DO-41G glass package. It provides a nominal Zener voltage of 22 V with a 5% tolerance, as indicated by the 'A' suffix. The device dissipates up to 1.0 W at ambient temperatures up to 50°C and operates within a junction temperature range of -65°C to +200°C. Key electrical characteristics include a maximum forward voltage drop of 1.2 V at 200 mA, a reverse leakage current of 5 µA at 16.7 V, and a dynamic impedance of 23 Ω at the test current of 11.5 mA.

Feature Summary

• Hermetically sealed glass construction for environmental stability
• Silicon planar technology ensuring consistent performance
• Built-in strain relief on leads to enhance mechanical durability

Applications

• Voltage regulation in DC power supplies
• Reference voltage generation in electronic circuits
• Overvoltage protection for sensitive components

Procurement Notes

Verify authenticity through authorized distributors or direct purchase from Micro Commercial Components to avoid counterfeit parts. Confirm the 'A' suffix indicates the required 5% voltage tolerance. Ensure compliance with RoHS standards if applicable, noting that lead-in-glass exemptions may apply. Check specific packaging requirements such as tape-and-reel or bulk options based on production needs.

Selection Notes

Select this component when a precise 22 V reference is needed with tight tolerance. The DO-41G package suits through-hole designs requiring high thermal resistance and hermetic sealing. Consider the 1.0 W power dissipation limit and derating factors above 50°C. Evaluate the low leakage current and dynamic impedance for applications demanding stable regulation under varying load conditions.

Part Context

This part belongs to the 1N47xx series of 1 Watt Zener diodes manufactured by Micro Commercial Components. The series covers a wide voltage range from 3.3 V to 75 V. The 'TP' suffix typically denotes tape-and-reel packaging, while the 'A' suffix specifies the 5% voltage tolerance variant. These diodes are designed for general-purpose voltage regulation and protection tasks.

Replacement Considerations

Compatible substitutes include other manufacturers' 1N4748A devices meeting the same 22 V, 1 W, and 5% tolerance specifications. Verify package compatibility (DO-41) and thermal characteristics. Ensure replacement parts offer similar leakage current and dynamic impedance values for equivalent circuit performance.

FAQ

What does the 'A' suffix signify in the 1N4748A-TP part number?

The 'A' suffix indicates that the Zener voltage has a tolerance of ±5%. Without a suffix, the tolerance would be 10%, and 'C' would indicate 2%.

How is the Zener impedance measured for this component?

Zener impedance is derived from the 60 Hz AC voltage resulting when an AC current with an RMS value equal to 10% of the DC Zener current is superimposed on the DC current.

What is the maximum operating junction temperature?

The maximum operating junction temperature is +200°C, allowing for operation in high-temperature environments.