Microchip Technology 1N5280BE3

Overview

1N5280BE3 from Microsemi is a 190 V, ±5% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 0.1 μA maximum reverse current at 152 V, with 2400 Ω zener impedance at 0.25 mA and +0.110 %/°C temperature coefficient - used for precision voltage reference and overvoltage protection in industrial power supplies.

For engineers reviewing the 1N5280BE3 datasheet, 1N5280BE3 pinout, 1N5280BE3 application, or 1N5280BE3 equivalent, key selection criteria include nominal Zener voltage (190 V), tight ±5% tolerance (B suffix), RoHS-compliant matte-tin plating (e3 suffix), DO-35 mechanical robustness, and operation across –65°C to +175°C.

Technical Context

This device operates as a two-terminal voltage regulator in reverse-biased mode, with cathode band indicating polarity and requiring banded end to be positive relative to anode for regulation. Its breakdown knee is verified via dual-point Zener impedance measurement per MicroNote 202 to ensure stability.

The 1N5280BE3 exhibits minimal capacitance (typical <2 pF per Figure 2), low ESD sensitivity (MIL-STD-750 Method 1020), and inherent radiation hardness per MicroNote 050 - enabling use in high-reliability analog monitoring and aerospace-grade bias networks.

Key Specifications

Pinout & Package

DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with tin-lead or RoHS-compliant matte-tin plating; cathode identified by single black band; weight 0.2 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5280BE3, 1N5280B lacks RoHS compliance and requires leaded solder processes, while MMBZ5280B trades axial-leaded mechanical robustness for SMT scalability - both retain identical Zener voltage and tolerance but differ in mounting, reliability under vibration, and thermal path design.

Availability

1N5280BE3 is available at Aetrix Electronics and suitable for industrial power supply reference, aerospace voltage clamp, and downhole sensor bias network applications requiring stable component supply across extended temperature and radiation environments.

Supply support for 1N5280BE3 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 and mixed-signal components for defense, aerospace, and industrial markets.

The 1N52xxB series was designed specifically for ruggedized voltage regulation in mission-critical systems where long-term parametric stability, extreme temperature operation, and radiation tolerance are mandatory.

FAQ

What is the Zener voltage tolerance of the 1N5280BE3?

The 1N5280BE3 has a nominal Zener voltage of 190 V with a guaranteed tolerance of ±5%, indicated by the "B" suffix in the part number. This tolerance is validated per JEDEC standards and applies across the full operating temperature range of –65°C to +175°C, ensuring consistent regulation performance in harsh environments where the 1N5280BE3 is deployed.

Does the 1N5280BE3 require external heat sinking?

No, the 1N5280BE3 does not require external heat sinking under typical operating conditions. Its 500 mW power dissipation rating is specified at 25°C with 3/8-inch lead length, and it features a thermal resistance of 250°C/W junction-to-lead. When mounted on FR4 with 4 mm² copper pads, the 1N5280BE3 remains within safe junction limits up to 50°C ambient - sufficient for most 1N5280BE3 applications.

How is polarity marked on the 1N5280BE3?

The 1N5280BE3 uses a single black band on the glass body to identify the cathode terminal. For proper Zener regulation, the banded end must be held positive relative to the unbanded (anode) end. This polarity marking is standardized across all DO-35 Zeners and is critical for correct circuit operation - reversing polarity forward-biases the 1N5280BE3 and disables regulation.

Is the 1N5280BE3 suitable for high-reliability aerospace applications?

Yes, the 1N5280BE3 is qualified for aerospace use through its inherent radiation hardness (per MicroNote 050), MIL-STD-750 ESD immunity, and optional military screening levels (e.g., JANTXV with MQ/MV prefix). Its –65°C to +175°C operating range and hermetic DO-35 glass package make the 1N5280BE3 appropriate for satellite power conditioning and flight control subsystems.

What is the maximum reverse leakage current for the 1N5280BE3?

The 1N5280BE3 specifies a maximum reverse leakage current (IR) of 0.1 μA measured at 152 V - 80% of its 190 V nominal Zener voltage. This ultra-low leakage ensures minimal loading on high-impedance reference nodes and supports accurate voltage sensing in battery-powered or energy-harvesting systems where the 1N5280BE3 serves as a precision clamp.