Microchip Technology 1N4567

Overview

1N4567 from Microsemi is a 6.4 V temperature-compensated Zener reference diode in DO-7 (DO-204AA) glass axial-leaded package, rated for 0.5 mA test current, ±0.002 %/°C temperature coefficient, 200 Ω dynamic impedance, and operation from –65 °C to +175 °C. It delivers high-stability voltage reference for precision analog instrumentation requiring minimal drift over temperature.

For engineers reviewing the 1N4567 datasheet, 1N4567 pinout, 1N4567 application, or 1N4567 equivalent, key selection criteria include its ultra-low TC (0.002 %/°C), tight 6.4 V nominal tolerance, hermetic DO-7 packaging, military-grade qualification options, and suitability for high-reliability voltage reference circuits where thermal stability dominates design constraints.

Technical Context

The 1N4567 uses internal metallurgical bonding to achieve zero-temperature-coefficient behavior near 6.4 V by balancing positive and negative TC components of the Zener and avalanche mechanisms. Its 0.5 mA Zener test current is optimized for <30 mW power dissipation to maintain thermal equilibrium and minimize self-heating effects on voltage stability.

Designed for operation with cathode positive (reverse-biased), it exhibits 2.0 µA maximum reverse leakage at 3 V and supports full military qualification (JAN/JANTX/JANTXV) when ordered with appropriate prefixes and the "–1" suffix. The DO-7 package ensures hermetic sealing and solderability per MIL-STD-750 Method 2026.

Key Specifications

Pinout & Package

DO-7 (DO-204AA) glass axial-leaded package with cathode band marking; leads are tin-lead plated and solderable per MIL-STD-750 Method 2026. Polarity: cathode (banded end) must be biased positive relative to anode for proper Zener operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4567, 1N4566A offers lower cost at the expense of thermal stability, while 1N4568A provides superior TC performance for critical metrology use cases - both share identical pinout, biasing, and packaging, enabling direct substitution with design review.

Availability

1N4567 is available at Aetrix Electronics and suitable for high-reliability voltage reference applications in aerospace avionics, downhole instrumentation, precision data acquisition, and military power monitoring requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 1N4567 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 radiation-hardened components for defense, aerospace, and industrial markets.

The 1N4565–1N4584A series belongs to Microsemi's legacy high-stability Zener reference diode family, engineered specifically for applications demanding minimal voltage drift over extreme temperature and long-term operational life.

FAQ

What is the Zener test current for 1N4567 and why is it critical?

The 1N4567 has a Zener test current (I_ZT) of 0.5 mA, specified per JEDEC standards to ensure consistent measurement of its 6.4 V nominal voltage and ±0.002 %/°C temperature coefficient. Operating the 1N4567 at this current minimizes self-heating and maintains optimal TC performance; deviating significantly affects voltage accuracy and thermal stability. The 1N4567 must be biased externally to deliver this precise current for datasheet-compliant operation.

Does 1N4567 require derating above 25 °C ambient?

Yes - the 1N4567 has a maximum power dissipation of 500 mW at T_L = 25 °C, but its recommended operating power is below 30 mW to preserve voltage-temperature stability. As ambient temperature rises, the allowable dissipation decreases linearly per its thermal resistance profile. For reliable long-term performance, keep power below 30 mW regardless of ambient, making the 0.5 mA I_ZT inherently safe across its full –65 °C to +175 °C operating range. This applies directly to every 1N4567 unit.

Can 1N4567 be used in surface-mount designs?

No - the 1N4567 is exclusively offered in the axial-leaded DO-7 (DO-204AA) glass package and is not a surface-mount device. Microsemi does offer surface-mount equivalents such as the JANTX1N4569AUR-1 in DO-213AA, but those are distinct part numbers with different mechanical and thermal characteristics. Substituting 1N4567 into SMT layouts would require through-hole mounting or adapter hardware; no SMT variant exists for the 1N4567 itself.

How does the temperature coefficient of 1N4567 compare to standard Zeners?

The 1N4567's ±0.002 %/°C temperature coefficient is over 100× lower than typical 5% tolerance Zeners (which often exceed ±0.1 %/°C). This ultra-low TC results from precision metallurgical compensation between Zener and avalanche breakdown regions at ~6.4 V. Unlike generic Zeners, the 1N4567 achieves near-zero net drift across 0 to +75 °C - a capability confirmed in its Electrical Characteristics table and validated in Microsemi's application graphs. This makes the 1N4567 uniquely suited for metrology-grade references.

Is there a radiation-hardened version of 1N4567?

Yes - Microsemi designates radiation-hardened variants using the "RH" prefix instead of "1N", resulting in RH4567A for the radiation-tolerant equivalent of 1N4567A. These RH-series parts undergo additional screening and process controls to meet total ionizing dose (TID) requirements for space and nuclear applications. The RH4567A retains identical electrical specifications and DO-7 packaging as the commercial 1N4567, but requires separate ordering and qualification documentation. The base 1N4567 is not radiation hardened.