Microchip Technology 1N5365E3/TR13

Overview

1N5365E3/TR13 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 36 V, ±5% tolerance (B-suffix equivalent), 30 mA test current, 11 Ω dynamic impedance at I_ZT, and maximum reverse current of 0.5 µA at 27.4 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 1N5365E3/TR13 datasheet, 1N5365E3/TR13 pinout, 1N5365E3/TR13 application, or 1N5365E3/TR13 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), surge current rating (160 A), voltage regulation (ΔV_Z = 3.3 V), and RoHS-compliant matte-tin plating.

Technical Context

This device functions as a two-terminal voltage regulator operating in reverse breakdown mode. Its Zener voltage is specified at 36 V ±5% under 30 mA DC test current at 25 °C lead temperature, with dynamic impedance measured at 1 kHz AC superimposed on DC bias.

Thermal performance is defined relative to lead temperature (TL) - not ambient - with 5.0 W steady-state dissipation rated at TL < 25 °C (3/8″ lead length from body). Derating begins at 25 °C/W junction-to-lead thermal resistance, enabling high-current operation when adequately heat-sunk.

Key Specifications

Pinout & Package

Package: Axial-leaded T-18 plastic case per JEDEC DO-204AL standard; void-free UL94V-0 epoxy body; cathode indicated by band; RoHS-compliant matte-tin plated leads; weight 0.7 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5365B and SMBJ5365B, the 1N5365E3/TR13 uniquely combines RoHS compliance, axial-leaded mechanical mounting flexibility, and superior junction-to-lead thermal resistance - making it optimal for through-hole power supply designs requiring field-replaceability and high-reliability thermal derating.

Availability

1N5365E3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, programmable reference sources, and DC link monitoring systems requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for 1N5365E3/TR13 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 radiation-hardened components for aerospace, defense, and industrial markets.

The 1N53xxB series was designed for ruggedized voltage regulation in harsh-environment power systems - emphasizing thermal stability, surge survivability, and long-term parametric consistency under extended temperature cycling.

FAQ

What is the Zener voltage tolerance of the 1N5365E3/TR13?

The 1N5365E3/TR13 has a Zener voltage tolerance of ±5%, confirmed by its "B" suffix in the base part number (1N5365B) and documented in Microsemi's REV D datasheet. This tolerance applies at 30 mA test current and 25 °C lead temperature. The e3 suffix indicates RoHS compliance but does not alter voltage tolerance. The 1N5365E3/TR13 maintains this specification across its qualified operating temperature range of –65 °C to +150 °C.

Can the 1N5365E3/TR13 be used in surface-mount designs?

No - the 1N5365E3/TR13 is an axial-leaded T-18 package device intended for through-hole mounting. For surface-mount equivalents, Microsemi specifies the SMBJ5365B in SMB package. Substituting 1N5365E3/TR13 into an SMT footprint would require mechanical adaptation and compromise thermal performance due to its 25 °C/W junction-to-lead resistance being optimized for lead conduction, not PCB copper spread.

What is the maximum surge current rating for the 1N5365E3/TR13?

The 1N5365E3/TR13 has a maximum non-recurrent surge current (I_ZSM) of 160 A, defined as the peak of an 8.3 ms half-sine waveform. This rating is validated per Microsemi's test methodology and reflects the device's ability to absorb transient energy without parametric shift or failure. It supports use in applications exposed to lightning-induced surges or inductive switching spikes when properly coordinated with upstream current-limiting impedance.

How does the thermal resistance of the 1N5365E3/TR13 affect PCB layout?

The 1N5365E3/TR13 has a junction-to-lead thermal resistance of 25 °C/W, meaning effective cooling relies on conductive heat transfer through its axial leads - not PCB copper area. Layout must ensure ≥10 mm (3/8″) straight lead length from the epoxy body to mounting points, with minimal bending near the case. Unlike SMT Zeners, copper pour size has negligible impact; instead, heatsinking is achieved via chassis connection or metal-core board interfaces at the lead termination points.

Is the 1N5365E3/TR13 suitable for precision reference applications?

Yes - the 1N5365E3/TR13 delivers precision reference performance with 36 V ±5% tolerance, 3.3 V voltage regulation (ΔV_Z), and 11 Ω dynamic impedance at 30 mA. Its low 0.5 µA reverse leakage at 27.4 V minimizes error in high-impedance divider networks. However, for sub-1% absolute accuracy or low-tempco requirements, users should pair the 1N5365E3/TR13 with calibration or select tighter-tolerance variants like 1N5365C (±2%) - both share identical package and thermal behavior.