Microchip Technology 1N4567A

Overview

1N4567A from Microsemi is a hermetically sealed, glass-encapsulated, temperature-compensated Zener reference diode in DO-7 (DO-204AA) package, delivering 6.4 V ±5% nominal reference voltage at 0.5 mA test current, with ultra-low 0.002%/°C temperature coefficient and 200 Ω dynamic impedance-designed for high-stability voltage references in precision instrumentation and aerospace power conditioning circuits.

For engineers reviewing the 1N4567A datasheet, 1N4567A pinout, 1N4567A application, or 1N4567A equivalent, key selection criteria include its 0.002%/°C TC over –55°C to +100°C, 500 mW max power dissipation, MIL-PRF-19500/452 qualification readiness via prefix/suffix options, and axial-leaded DO-7 mechanical compatibility for through-hole mounting in harsh-environment analog subsystems.

Technical Context

This device belongs to Microsemi's zero-temperature-coefficient Zener family optimized for minimal ΔV_Z drift across wide operating temperatures. Its compensation architecture combines two oppositely temperature-dependent Zener junctions internally metallurgically bonded to achieve net TC as low as 0.002%/°C at I_ZT = 0.5 mA.

The 1N4567A operates exclusively in reverse-bias mode with cathode band positive relative to anode, requiring stable 0.5 mA bias current for specified TC performance. It supports military-grade reliability with operating range –65°C to +175°C and storage up to +175°C, and meets MIL-STD-750 Method 1020 for ESD insensitivity.

Key Specifications

Pinout & Package

Package: DO-7 (DO-204AA), hermetically sealed glass axial-leaded case with tin-lead plated leads per MIL-STD-750 Method 2026. Cathode identified by black band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4567A, 1N4568A delivers marginally better TC at identical operating point, while 1N4572A trades higher test current for halved dynamic impedance-enabling improved regulation in current-rich, noise-sensitive analog supplies without changing voltage setpoint or package.

Availability

1N4567A is available at Aetrix Electronics and suitable for high-reliability voltage reference designs in aerospace power monitoring, downhole sensor signal conditioning, and precision instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 1N4567A 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 aerospace, defense, and industrial markets.

The 1N4565–1N4584A series was engineered specifically for mission-critical voltage reference applications demanding ultra-low temperature drift, hermetic packaging, and military qualification pathways-targeting avionics, satellite subsystems, and ruggedized test equipment.

FAQ

What is the nominal Zener voltage and tolerance of the 1N4567A?

The 1N4567A has a nominal Zener voltage of 6.4 V with a standard tolerance of ±5% at 0.5 mA test current. Tighter tolerances such as ±1% or ±2% are available by adding suffixes like "-1%" or "-2%" to the part number (e.g., 1N4567A-1%). This voltage remains stable across its specified operating temperature range when biased at the exact 0.5 mA test current.

What is the temperature coefficient of the 1N4567A and over what range is it specified?

The 1N4567A exhibits a temperature coefficient of 0.002%/°C, specified over the temperature range of –55°C to +100°C. This value reflects the net drift after internal temperature compensation and is measured under controlled 0.5 mA bias conditions. The coefficient remains consistent across the full operating range, enabling predictable reference behavior in thermally variable environments.

Can the 1N4567A be used in military-qualified designs?

Yes-the 1N4567A serves as the commercial base for qualified variants: adding prefixes like JANTX or JANTXV and the "-1" suffix yields MIL-PRF-19500/452-compliant versions (e.g., JANTX1N4567A-1). These undergo additional screening, traceability, and environmental testing. The base 1N4567A itself is not qualified but shares identical electrical and mechanical characteristics with its qualified derivatives.

What is the maximum power dissipation rating for the 1N4567A and how does it derate with temperature?

The 1N4567A has a maximum DC power dissipation of 500 mW at lead temperature (T_L) = 25°C. Derating begins linearly above 25°C, typically at ~6.67 mW/°C, reaching zero dissipation at approximately 100°C lead temperature. For reliable operation, power should remain below 30 mW when optimizing for best voltage-temperature stability, as noted in the datasheet's Electrical Characteristics table.

How is polarity identified on the 1N4567A and what is its correct biasing configuration?

The 1N4567A uses a cathode band (black stripe) to identify the cathode terminal. It must be operated in reverse bias: the banded (cathode) end is held positive with respect to the unbanded (anode) end. Applying forward bias will not produce the specified Zener voltage and may damage the device. Correct polarity is essential for achieving the 6.4 V reference and ultra-low TC performance.