1N4738ATA

Overview

The onsemi 1N4738ATA is a silicon unidirectional voltage regulator diode housed in a hermetically sealed glass DO-41 package. It provides an 8.2V nominal Zener voltage with a ±5% tolerance and a maximum power dissipation of 1W at 25°C ambient temperature. The device features a low dynamic impedance of 4.5Ω and a maximum reverse leakage current of 10μA. Designed for through-hole mounting, it operates within a junction temperature range up to 200°C and supports high-temperature soldering.

Feature Summary

• Hermetically sealed glass construction ensures environmental stability
• Low dynamic impedance for effective voltage regulation
• High thermal resistance capability for robust performance

Applications

• Voltage reference circuits
• Overvoltage protection systems
• Power supply regulation

Procurement Notes

Verify the specific suffix 'ATA' against official datasheets to confirm hermetic sealing status, as standard commercial variants may differ. Ensure procurement channels provide traceability documentation required for aerospace or military applications where hermeticity is critical. Confirm RoHS compliance status if applicable to your manufacturing environment.

Selection Notes

Select this component when hermetic sealing is mandatory for reliability in harsh environments. Compare the 4.5Ω dynamic impedance against circuit requirements for noise sensitivity. Verify that the DO-41 axial leaded package fits the PCB layout constraints and that the 1W power rating accommodates the expected thermal load without excessive derating.

Part Context

This part belongs to the 1N47 series of 1-watt Zener diodes manufactured by onsemi. The series offers a wide range of voltage options from 3.3V to 100V. The 'ATA' designation typically indicates a specific packaging or screening variant, often associated with hermetic glass packages suitable for high-reliability applications compared to standard plastic or non-hermetic glass equivalents.

Replacement Considerations

Equivalent parts include the Microsemi MV1N4738APTR (plastic DO-41) and generic 1N4738A devices. Note that non-hermetic replacements lack the sealed glass envelope, which may affect long-term reliability in humid or corrosive environments. Verify pinout compatibility and thermal characteristics before substitution.