Microchip Technology 1N5344E3/TR12

Overview

1N5344E3/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 8.2 V ±5%, 150 mA test current (IZT), 1.5 Ω dynamic impedance (ZZ), and maximum reverse current of 10 μA at 5.9 V. It operates from –65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in industrial power supplies.

For engineers reviewing the 1N5344E3/TR12 datasheet, 1N5344E3/TR12 pinout, 1N5344E3/TR12 application, or 1N5344E3/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (10 A), voltage regulation (ΔVZ = 0.20 V), and RoHS-compliant matte-tin plating per MIL-STD-750.

Technical Context

This discrete Zener diode functions as a two-terminal voltage regulator in shunt configuration, maintaining stable output voltage across variable load currents within its 5 W power envelope. Its low dynamic impedance (1.5 Ω) and tight ±5% tolerance ensure minimal voltage deviation under changing bias conditions.

The device uses a void-free thermosetting epoxy T-18 package with cathode band marking, rated for 260 °C soldering (10 s), and achieves 25 °C/W thermal resistance when leads are trimmed to 3/8″ (10 mm) from body-enabling reliable operation at up to 150 °C junction temperature with adequate heat sinking.

Key Specifications

Pinout & Package

T-18 axial-leaded plastic package with cathode indicated by colored band; leads are annealed matte-tin plated per MIL-STD-750, method 2026, and solderable at 260 °C for 10 s. Moisture sensitivity level is IPC/JEDEC J-STD-020B Level 1-no dry pack required.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5344B and MMSZ5236B-TP, the 1N5344E3/TR12 uniquely combines RoHS compliance, 5 W power handling, axial-leaded through-hole mounting, and 1.5 Ω dynamic impedance-making it the sole option for high-reliability, medium-power, lead-free industrial designs requiring JEDEC-standard form factor.

Availability

1N5344E3/TR12 is available at Aetrix Electronics and suitable for industrial power supply reference, overvoltage protection circuit, and programmable logic controller I/O protection requiring stable component supply and full RoHS compliance.

Supply support for 1N5344E3/TR12 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 analog, RF, and discrete components for aerospace, defense, and industrial markets.

The 1N53xxE3 series belongs to Microsemi's legacy silicon Zener diode product line, engineered for ruggedized voltage regulation in mission-critical power systems where thermal stability, surge resilience, and long-term parametric consistency are mandatory.

FAQ

What is the Zener voltage tolerance of the 1N5344E3/TR12?

The 1N5344E3/TR12 has a Zener voltage tolerance of ±5%, as indicated by the "B" suffix in its base family (1N5344B) and confirmed in the electrical characteristics table. This means its nominal 8.2 V regulation point falls between 7.79 V and 8.61 V at 25 °C with 150 mA test current. The e3 suffix denotes RoHS compliance but does not alter voltage tolerance.

Can the 1N5344E3/TR12 be used in surface-mount designs?

No-the 1N5344E3/TR12 uses a T-18 axial-leaded package and is designed exclusively for through-hole mounting. For surface-mount equivalents, Microsemi offers the SMBJ5344B (SMB package, 5 W) or MMSZ5236B (SOD-123, 200 mW). Neither is a direct replacement due to differing thermal performance and package geometry; board redesign is required.

What is the maximum steady-state power dissipation of the 1N5344E3/TR12 at ambient temperature?

When mounted on a standard FR4 PCB (1 oz Cu, 4 mm² pads, 1 mm track width, 25 mm length), the 1N5344E3/TR12 delivers 1.47 W steady-state power at TA = 25 °C. Its full 5 W rating applies only when lead temperature (TL) is maintained at 25 °C via heatsinking-achieved with 3/8″ (10 mm) lead length from body and thermal resistance of 25 °C/W junction-to-lead.

Does the 1N5344E3/TR12 meet MIL-PRF-19500 screening standards?

No-the 1N5344E3/TR12 is a commercial-grade part with e3 RoHS compliance but no military screening. To obtain JAN, JANTX, or JANTXV versions, prefixes such as MQ, MX, or MV must be added (e.g., MQ1N5344B), and those variants require separate ordering. The e3 suffix alone does not imply military qualification.

What is the reverse leakage current specification for the 1N5344E3/TR12?

The 1N5344E3/TR12 specifies a maximum reverse current (IR) of 10 μA at VR = 5.9 V-this is the voltage at which leakage is guaranteed not to exceed that value. At voltages below 5.9 V, leakage drops further; at voltages approaching 8.2 V, current rises sharply into the Zener breakdown region. This IR value confirms stable blocking behavior prior to regulation onset.