Microchip Technology 1N5351AE3/TR12

Overview

1N5351AE3/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 14 V, ±10% tolerance (A suffix), 2.5 Ω maximum dynamic impedance at 100 mA test current, and 6.7 V maximum voltage regulation (ΔVZ) across 10–50% of IZM. It operates from –65°C to +150°C and is used for primary DC voltage reference and overvoltage clamping in industrial power supplies.

For engineers reviewing the 1N5351AE3/TR12 datasheet, 1N5351AE3/TR12 pinout, 1N5351AE3/TR12 application, or 1N5351AE3/TR12 equivalent, key selection criteria include Zener voltage tolerance, surge current rating (6.7 A), thermal resistance (25 °C/W junction-to-lead), and RoHS-compliant matte-tin plating per MIL-STD-750.

Technical Context

This device functions as a two-terminal voltage reference by operating in reverse breakdown, where its Zener voltage remains stable over a wide current range (100 mA IZT to 670 mA IZM). Its low dynamic impedance (2.5 Ω) and tight ΔVZ (6.7 V) ensure minimal output variation under load transients.

Designed for axial-lead mounting on FR4 PCBs or with heat sinking at the lead, it delivers 5 W steady-state power at TL < 25°C (3/8″ from body), derating linearly above that temperature. The cathode band indicates polarity, and operation requires the banded end to be positive relative to the anode.

Key Specifications

Pinout & Package

Package: T-18 axial-leaded plastic encapsulated case (Void-free UL94V-0 epoxy), 0.7 g weight, cathode indicated by band. Leads are RoHS-compliant annealed matte-tin plated per MIL-STD-750 Method 2026.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5351AE3/TR12, the B-suffix variant improves voltage accuracy without changing thermal or surge performance, while the C-suffix version further tightens tolerance to ±2%-enabling higher-precision reference designs without altering PCB layout or thermal management.

Availability

1N5351AE3/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive battery monitoring systems, and field instrumentation requiring stable component supply with full RoHS compliance and JEDEC-standard packaging.

Supply support for 1N5351AE3/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 timing solutions for aerospace, defense, and industrial markets.

The 1N53xx series was designed as a ruggedized, high-power axial Zener family delivering stable voltage regulation from 3.3 V to 200 V with military-grade screening options and extended temperature operation.

FAQ

What is the Zener voltage tolerance of the 1N5351AE3/TR12?

The 1N5351AE3/TR12 has a ±10% Zener voltage tolerance, indicated by the "A" suffix per Microsemi's documentation. This means its regulated voltage falls between 12.6 V and 15.4 V at 100 mA test current and 25°C lead temperature. The e3 suffix confirms RoHS compliance, and TR12 denotes tape-and-reel packaging per EIA-296. This tolerance is suitable for general-purpose clamping and reference applications where tight regulation is not critical.

What is the maximum continuous current rating for the 1N5351AE3/TR12?

The 1N5351AE3/TR12 has a maximum continuous Zener current (IZM) of 670 mA when operated with lead temperature (TL) maintained below 25°C at 3/8″ from the body. This rating assumes adequate heat sinking; derating applies above 25°C per Figure 1 in the datasheet. At 25°C ambient on FR4 board (1 oz Cu, 4 mm² pads), steady-state power drops to 1.47 W, limiting usable current to approximately 105 mA for sustained operation without forced cooling.

Does the 1N5351AE3/TR12 have a defined surge current rating?

Yes, the 1N5351AE3/TR12 has a specified non-repetitive surge current (IZSM) of 6.7 A for an 8.3 ms half-sine waveform. This rating reflects its ability to absorb transient energy during events like inductive switching or load dump. The surge capability is enabled by its 5 W power rating and low thermal resistance (25 °C/W junction-to-lead), allowing brief high-current conduction without permanent degradation when properly mounted.

How is polarity marked on the 1N5351AE3/TR12?

The 1N5351AE3/TR12 uses a cathode band to indicate polarity: the banded end is the cathode and must be held at a higher potential than the anode to operate in Zener breakdown. This marking conforms to JEDEC standards and is visible on the black epoxy T-18 case. During circuit operation, reverse current flows from cathode to anode, establishing the regulated 14 V reference at the cathode node relative to ground or the anode connection point.

What does the "e3" and "TR12" suffix mean in 1N5351AE3/TR12?

The "e3" suffix in 1N5351AE3/TR12 denotes RoHS compliance with lead-free matte-tin plating per JEDEC J-STD-609A, while "TR12" specifies tape-and-reel packaging per EIA-296 standard (12 mm tape width, 1000 pcs/reel). These suffixes do not affect electrical parameters but define environmental compliance and logistics format. The base "1N5351A" identifies the 14 V ±10% Zener within the JEDEC-registered 1N53xx family.