1N5301UR-1/TR

Overview

The Microchip Technology 1N5301UR-1/TR is a surface-mount current regulator diode housed in a DO-213AB (MELF, LL41) glass package. It provides a nominal regulating current of 1.4 mA with a standard tolerance of ±10%. The device operates within a working peak voltage range up to 100 V and dissipates a steady-state power of 500 mW at a lead temperature of +125 °C. Qualified per MIL-PRF-19500/463, it supports the JANTXV reliability level. Electrical characteristics include a minimum dynamic impedance of 0.54 MΩ and a maximum limiting voltage of 1.55 V.

Feature Summary

• Features a hermetically sealed glass case with an internal metallurgical bond for enhanced durability.
• Provides stable current regulation across a broad operating voltage and temperature range.
• Offers high source impedance and inherent radiation hardness suitable for demanding environments.

Applications

• Current limiting circuits requiring precise regulation over wide voltage swings.
• Biasing networks for semiconductor devices needing constant current sources.
• Protection stages in military or aerospace systems utilizing qualified components.

Procurement Notes

Verify that the specific ordering suffix matches the required qualification level, as the base part number covers multiple grades. Confirm RoHS compliance status if environmental regulations apply, noting that commercial versions may differ from military qualifications. Ensure the MELF package dimensions align with the target PCB footprint before finalizing procurement orders.

Selection Notes

Select this component when a surface-mount solution is required for applications previously using axial-leaded 1N5301 diodes. Consider the 10% current tolerance and the 100 V peak voltage rating against circuit requirements. Evaluate thermal management needs, as power dissipation must be derated above +125 °C. Verify that the JANTXV grade meets the specific reliability standards of the intended deployment environment.

Part Context

This device belongs to the 1N5283UR-1 through 1N5314UR-1 series of 0.5 W current regulators. The series offers a selection of currents ranging from 0.22 mA to 4.7 mA. These devices serve as counterparts to Zener diodes by regulating current rather than voltage. The UR-1 designation indicates the JEDEC registered surface mount equivalent of the traditional axial series.

Replacement Considerations

Direct replacements include other manufacturers' equivalents of the 1N5301 current regulator diode in the DO-213AB package. For axial-leaded applications, the 1N5301 in the DO-7 package serves as the mechanical predecessor. Verify electrical parameters such as knee voltage and dynamic impedance when substituting with non-Microchip parts.

FAQ

What is the maximum working peak voltage for the 1N5301UR-1/TR?

The maximum working peak voltage (VWM) is specified as 100 V.

How is the polarity indicated on the DO-213AB package?

Polarity is marked by a cathode band on the glass case; the banded end must be connected to the negative side of the circuit.

Is the 1N5301UR-1/TR radiation hard?

Yes, the device is inherently radiation hard, as described in Microsemi MicroNote 050.