Microchip Technology 1N4760UR-1/TR

Overview

1N4760UR-1/TR from Microsemi is a surface-mount 1.0 W glass Zener diode with nominal Zener voltage 68 V, ±5% tolerance (A-suffix), 3.7 mA test current, 150 Ω dynamic impedance at I_ZT, and 5 μA maximum reverse leakage at 51.7 V. It uses a hermetically sealed DO-213AB glass MELF package and operates from –65 °C to +175 °C, suited for precision voltage regulation in high-reliability power supply feedback paths.

For engineers reviewing the 1N4760UR-1/TR datasheet, 1N4760UR-1/TR pinout, 1N4760UR-1/TR application, or 1N4760UR-1/TR equivalent, key selection criteria include Zener voltage accuracy, low dynamic impedance at regulation current, thermal resistance (130 °C/W on FR4), surge current rating (2000 mA), and RoHS-compliant matte-tin terminations.

Technical Context

This device functions as a two-terminal voltage reference diode operating in reverse breakdown, delivering stable 68 V regulation across 0.25–2000 mA DC and transient currents. Its DO-213AB glass MELF construction provides hermetic sealing, inherent radiation hardness per MicroNote 050, and low parasitic capacitance - critical for noise-sensitive analog and aerospace-grade feedback loops.

It is electrically equivalent to the through-hole 1N4760A but optimized for surface mounting with tighter thermal resistance control (50 °C/W junction-to-end-cap) and compatibility with EIA-481-B tape-and-reel handling (1500/reel). Polarity is marked by a cathode band; operation requires cathode-positive bias relative to anode.

Key Specifications

Pinout & Package

Package: DO-213AB glass MELF - hermetically sealed, leadless cylindrical surface-mount package with axial cathode band marking. Dimensions: A = 2.39–2.66 mm (length), B = 4.80–5.20 mm (diameter), C = 0.41–0.55 mm (band width).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Compared with 1N4760A and SMAJ4760A, the 1N4760UR-1/TR uniquely combines surface-mount DO-213AB packaging, hermetic glass construction, radiation hardness, and low parasitic capacitance - making it the only choice for high-reliability, high-temperature, or radiation-exposed Zener regulation.

Availability

1N4760UR-1/TR is available at Aetrix Electronics and suitable for switch-mode power supply feedback, aerospace voltage reference, and high-temperature motor control applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 1N4760UR-1/TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and high-temperature analog and mixed-signal components.

The 1N4760UR-1/TR belongs to Microsemi's surface-mount glass Zener diode family, engineered for precision voltage regulation in mission-critical systems where hermeticity, thermal stability, and radiation tolerance are mandatory.

FAQ

What is the Zener voltage tolerance of the 1N4760UR-1/TR?

The 1N4760UR-1/TR has a nominal Zener voltage of 68 V with a tolerance of ±5%, indicated by the "A" suffix in its designation. This tolerance is verified at 3.7 mA test current and 30 °C case temperature, and remains stable across its full operating temperature range of –65 °C to +175 °C due to the DO-213AB glass MELF construction.

Does the 1N4760UR-1/TR require heatsinking in standard PCB layouts?

The 1N4760UR-1/TR dissipates up to 1.0 W and exhibits 130 °C/W thermal resistance junction-to-ambient on FR4 with 1 oz copper and recommended pad layout. At 50 °C ambient and full 1.0 W load, junction temperature reaches ~115 °C - within safe limits. Heatsinking is not required for typical operation, but thermal relief pads and copper pours improve margin in high-temperature environments.

Is the 1N4760UR-1/TR compatible with lead-free reflow processes?

Yes, the 1N4760UR-1/TR features RoHS-compliant annealed matte-tin plating rated for solder temperatures up to 260 °C for 10 seconds, fully compliant with IPC/JEDEC J-STD-020D moisture sensitivity and lead-free reflow profiles. Its glass MELF body withstands thermal shock without cracking or delamination during standard peak reflow cycles.

How does the 1N4760UR-1/TR differ from the 1N4760A in practical design?

The 1N4760UR-1/TR replaces the axial DO-41 1N4760A with a surface-mount DO-213AB package, reducing board space by >70% and enabling automated placement. It offers lower junction-to-end-cap thermal resistance (50 °C/W vs. 75 °C/W), superior hermeticity, and radiation hardness - critical for high-density, high-reliability, or harsh-environment designs where the 1N4760A cannot be substituted without layout and qualification changes.

What is the maximum reverse surge current rating for the 1N4760UR-1/TR?

The 1N4760UR-1/TR is rated for a maximum reverse surge current (I_S) of 2000 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating supports robust transient suppression in power supply input stages and protects downstream circuitry during load-dump or inductive switching events without degradation.