1N5303UR-1/TR

Overview

The Microchip Technology 1N5303UR-1/TR is a current regulator diode housed in a DO-213AB (MELF, LL41) surface-mount package. It provides a nominal regulating current of 1.60 mA with a tolerance range of 1.44 mA to 1.76 mA at a voltage of 25 V. The device supports a maximum working peak voltage of 100 V and dissipates up to 500 mW of power. It operates within a junction temperature range of -65 °C to +150 °C.

Feature Summary

• JEDEC registered surface mount equivalent of the 1N5283 through 1N5314 series
• Double-plug internal bond construction for high source impedance
• Inherently radiation hard design
• ESD nonsensitive operation

Applications

• Current regulation over broad operating voltage ranges
• Temperature-compensated reference elements
• Biasing networks for semiconductor devices

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm packaging details. The /TR suffix indicates tape and reel packaging per EIA-481-1-A standards. Confirm RoHS compliance status as it varies by grade. Ensure the procurement channel sources directly from authorized distributors or the manufacturer to guarantee authenticity and traceability.

Selection Notes

Select this component when a stable current source is required across varying voltage conditions. The 1.60 mA nominal current suits low-power biasing applications. Verify that the 500 mW power dissipation rating accommodates the expected thermal load. Consider the DO-213AB package dimensions for PCB layout constraints.

Part Context

This part belongs to the 1N5283UR-1 through 1N5314UR-1 family of 0.5 watt current regulators. These devices serve as counterparts to Zener diodes by regulating current rather than voltage. The series offers standard 10% current tolerances ranging from 0.22 mA to 10.0 mA.

Replacement Considerations

Direct equivalents include other 1N5303 variants such as JAN1N5303-1 or 1N5303-1. Surface-mount alternatives within the same family are 1N5303UR-1 without the trailing slash-T-R if bulk packaging is acceptable.

FAQ

What is the knee voltage specification for the 1N5303UR-1?

The maximum limiting voltage (VL) at IL = 0.8 IP(min) is specified as 1.65 volts.

How is the regulator impedance defined for this device?

The minimum regulator impedance (ZS) at VS = 25 V is 0.475 MΩ, derived by superimposing a 90 Hz RMS signal equal to 10% of VS on VS.

Is the 1N5303UR-1 hermetically sealed?

Yes, the device features a hermetically sealed glass case with tin/lead finished terminals or matte-tin finish for RoHS compliant versions.