Microchip Technology 1N5364BE3/TR8

Overview

1N5364BE3/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 33 V, ±5% tolerance (B suffix), 10 Ω maximum dynamic impedance at 40 mA test current, and 150 mA maximum DC zener current when adequately heat-sunk. 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 1N5364BE3/TR8 datasheet, 1N5364BE3/TR8 pinout, 1N5364BE3/TR8 application, or 1N5364BE3/TR8 equivalent, key selection criteria include its 33 V regulation stability under varying load currents, low 0.6 V voltage regulation (ΔVZ) across 10–50% IZM, RoHS-compliant matte-tin plating, and tape-and-reel packaging (TR8) for automated assembly.

Technical Context

This device functions as a two-terminal voltage regulator in reverse-biased mode, maintaining stable output voltage across a broad operating current range (10–150 mA). Its low thermal resistance (25 °C/W junction-to-lead at 10 mm lead length) enables high-power operation with minimal derating when mounted with adequate heatsinking.

The 1N5364BE3/TR8 exhibits tight regulation performance: voltage variation ΔVZ is limited to 0.60 V between 10% and 50% of IZM, and dynamic impedance ZZ remains ≤10 Ω at IZT = 40 mA - critical for low-noise reference and feedback loop stability in linear regulators.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5364BRLG and MMBZ5263BLT1G, the 1N5364BE3/TR8 uniquely delivers 5 W power handling in an axial-leaded, tape-and-reel format - essential for high-current shunt regulation where thermal mass and lead conduction dominate cooling.

Availability

1N5364BE3/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, telecom line protection circuits, and automotive sensor biasing requiring stable component supply with full RoHS compliance and JEDEC-standard reliability.

Supply support for 1N5364BE3/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 discrete components for aerospace, defense, and industrial markets.

The 1N53xxB series was designed specifically for ruggedized voltage regulation in mission-critical power systems - emphasizing thermal robustness, surge resilience, and long-term parametric stability under extended temperature cycling.

FAQ

What is the Zener voltage tolerance of the 1N5364BE3/TR8?

The 1N5364BE3/TR8 has a nominal Zener voltage of 33 V with ±5% tolerance, as indicated by the "B" suffix per Microsemi's documentation. This means the actual V_Z falls between 31.35 V and 34.65 V at 40 mA test current and 25 °C lead temperature. The e3 suffix confirms RoHS compliance, and TR8 denotes 8 mm tape-and-reel packaging. This tolerance enables predictable system-level margining in industrial power designs.

Can the 1N5364BE3/TR8 be used without a heatsink?

The 1N5364BE3/TR8 can operate without an external heatsink only at significantly derated power levels. At ambient temperature (T_A = 25 °C) on FR4 with 4 mm² copper pads, its steady-state power rating drops to 1.47 W - well below its 5 W rating at T_L = 25 °C. For full 5 W operation, the leads must be kept at ≤25 °C using ≥10 mm lead length and thermal conduction paths. The 1N5364BE3/TR8 datasheet specifies 25 °C/W junction-to-lead thermal resistance under those conditions.

What does the "TR8" suffix mean in 1N5364BE3/TR8?

The "TR8" suffix in 1N5364BE3/TR8 indicates tape-and-reel packaging per EIA-296 standard, using an 8 mm carrier tape. This format enables automated pick-and-place assembly in high-volume manufacturing. The base part 1N5364B is identical electrically and mechanically; TR8 adds logistics compatibility for SMT lines. The e3 designation remains separate and confirms RoHS compliance - both features are retained in the 1N5364BE3/TR8 ordering code.

How does the voltage regulation (ΔV_Z) of 1N5364BE3/TR8 affect circuit stability?

The 1N5364BE3/TR8 specifies ΔV_Z = 0.60 V - the difference between Zener voltage measured at 10% and 50% of I_ZM (150 mA). This low value indicates excellent regulation linearity across its operating current range, minimizing output drift in shunt regulator or reference applications. In practice, this allows the 1N5364BE3/TR8 to maintain stable 33 V references even as load current varies dynamically, directly improving feedback loop accuracy in power converters.

Is the 1N5364BE3/TR8 suitable for surge protection?

Yes - the 1N5364BE3/TR8 is rated for 150 A non-repetitive surge current (I_ZSM) in an 8.3 ms half-sine waveform, making it suitable for transient overvoltage clamping. Its 33 V regulation voltage and low ΔV_Z ensure clamping stays within safe limits (≤35.1 V) during surges. However, it must be applied with appropriate series impedance to limit average power dissipation. The 1N5364BE3/TR8 is commonly deployed in telecom line cards and industrial I/O protection where fast, high-energy transients occur.