Microchip Technology 1N5369C/TR8

Overview

1N5369C/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 51 V, ±2% tolerance (C suffix), 25 Ω dynamic impedance at 25 mA test current, and maximum reverse current of 0.5 μA at 40.8 V. It operates from –65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in power supply feedback loops.

For engineers reviewing the 1N5369C/TR8 datasheet, 1N5369C/TR8 pinout, 1N5369C/TR8 application, or 1N5369C/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (230 A), voltage regulation (ΔVZ = 0.9 V), and RoHS-compliant matte-tin plating per MIL-STD-750.

Technical Context

This device functions as a two-terminal voltage regulator in reverse-biased mode, maintaining stable output voltage across wide current variation (IZM = 25 mA at 51 V). Its low dynamic impedance (25 Ω) and tight ±2% tolerance ensure minimal voltage drift under load changes and temperature shifts.

The 1N5369C/TR8 uses a void-free thermosetting epoxy T-18 package with cathode band marking, rated for 5 W steady-state dissipation at 25 °C lead temperature (3/8″ from body), and exhibits 0.9 V voltage regulation between 10% and 50% of IZM - critical for high-accuracy reference designs.

Key Specifications

Pinout & Package

Package: Axial-leaded T-18 plastic encapsulated case with cathode indicated by colored band; moisture sensitivity level 1 (no dry pack required); RoHS compliant (e3 suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5369B/TR8, the 1N5369C/TR8 delivers tighter voltage control essential for feedback accuracy, while MMSZ5255ET1G offers footprint reduction at the expense of power handling and thermal robustness - making it unsuitable as a direct replacement in high-power applications.

Availability

1N5369C/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, programmable voltage monitors, and industrial sensor excitation references requiring stable component supply and long-term obsolescence management.

Supply support for 1N5369C/TR8 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 1N53xxB/C series was designed for rugged, high-stability voltage regulation in harsh-environment power systems where thermal resilience, surge immunity, and long-term parameter stability are critical.

FAQ

What is the Zener voltage tolerance of the 1N5369C/TR8?

The 1N5369C/TR8 has a Zener voltage tolerance of ±2%, as indicated by the "C" suffix in its part number. This means its nominal 51 V regulation voltage falls within 49.98 V to 52.02 V at 25 °C lead temperature. The tolerance is verified per JEDEC standards and applies across the full operating temperature range of –65 °C to +150 °C, making the 1N5369C/TR8 suitable for precision reference applications where tighter regulation than ±5% (B suffix) is required.

How much power can the 1N5369C/TR8 dissipate continuously?

The 1N5369C/TR8 is rated for 5.0 W steady-state power dissipation at a lead temperature (T_L) of 25 °C with leads extending 3/8 inch (10 mm) from the body. Derating is required above 25 °C - approximately 40 mW/°C - per the published power derating curve. When mounted on an FR4 PCB with 1 oz copper, its power capability drops to 1.47 W at 25 °C ambient due to higher thermal resistance (85 °C/W junction-to-ambient), so proper heatsinking or lead length management is essential to sustain full 5 W operation in the 1N5369C/TR8.

What does the "TR8" suffix mean in 1N5369C/TR8?

The "TR8" suffix in 1N5369C/TR8 indicates tape-and-reel packaging per EIA-296 standard, with 800 units per reel. This format supports automated pick-and-place assembly and ensures consistent orientation (cathode band facing outward) for reliable placement. The base part 1N5369C remains unchanged electrically and mechanically - TR8 adds no functional modification but enables high-volume manufacturing compatibility. Aetrix Electronics stocks the 1N5369C/TR8 in this industry-standard reel configuration for immediate SMT line integration.

Is the 1N5369C/TR8 RoHS compliant?

Yes, the 1N5369C/TR8 is RoHS compliant, as confirmed by the "e3" designation in Microsemi's official documentation and product labeling. It features annealed matte-tin plating on leads, fully compliant with EU Directive 2011/65/EU and exempt from lead content restrictions. The device meets JEDEC J-STD-020B moisture sensitivity level 1 requirements and requires no dry-packaging - simplifying storage and handling in lead-free manufacturing environments where the 1N5369C/TR8 is deployed.

What is the maximum reverse leakage current for the 1N5369C/TR8?

The maximum reverse leakage current (I_R) for the 1N5369C/TR8 is 0.5 μA, measured at a reverse voltage (V_R) of 40.8 V - which is 80% of its nominal 51 V Zener voltage. This low leakage confirms a sharp breakdown knee and minimal off-state conduction, critical for battery-backed systems and high-impedance sensing circuits. The specification is guaranteed over the full –65 °C to +150 °C operating temperature range and is independent of the ±2% V_Z tolerance band, ensuring predictable behavior in the 1N5369C/TR8 across all units.