Microchip Technology 1N4570

Overview

1N4570 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 Zener test current, 0.01 %/°C temperature coefficient, and 100 Ω dynamic impedance at I_ZT. It operates from –65 °C to +175 °C and delivers stable voltage reference performance in precision analog instrumentation and military-grade power supply feedback circuits.

For engineers reviewing the 1N4570 datasheet, 1N4570 pinout, 1N4570 application, or 1N4570 equivalent, this part serves as a low-drift, hermetically sealed, MIL-qualified reference solution where long-term stability, wide temperature operation, and ESD insensitivity per MIL-STD-750 Method 1020 are required.

Technical Context

The 1N4570 implements a metallurgically bonded Zener structure optimized for minimal voltage drift across temperature, with its 0.01 %/°C TC achieved via internal compensation between Zener and forward-biased junction voltages. Its 6.4 V nominal output is specified at 0.5 mA test current and exhibits <2 µA reverse leakage at 3 V.

This device belongs to the JEDEC-registered 1N4565–1N4584A-1 family and supports military qualification (JAN/JANTX/JANTXV) when ordered with appropriate prefixes and the "-1" suffix. It is not a standard Zener but a zero-TC reference diode engineered for metrology-grade stability rather than general-purpose regulation.

Key Specifications

Pinout & Package

DO-7 (DO-204AA) glass axial-leaded package with cathode band marking; polarity requires banded end to be positive relative to unbanded end during operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4570, 1N4571 offers higher test current headroom while maintaining identical TC and lower Z_ZT, whereas 1N4565 shares the same bias point but trades 100 Ω impedance for broader availability - both require verification of bias network compatibility before substitution.

Availability

1N4570 is available at Aetrix Electronics and suitable for high-reliability instrumentation, aerospace power management, and military calibration equipment requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 1N4570 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, radiation-hardened, and precision analog components for defense, aerospace, and industrial markets.

The 1N4570 belongs to Microsemi's Scottsdale Division legacy reference diode product line, designed specifically for metrology-grade voltage referencing where long-term stability, extreme temperature resilience, and MIL-spec compliance are mandatory.

FAQ

What is the Zener test current for 1N4570?

The 1N4570 is specified at a Zener test current (I_ZT) of 0.5 mA. This current level is critical to achieve the published 6.4 V nominal voltage and 0.01 %/°C temperature coefficient. Operating significantly above or below this current will increase dynamic impedance and degrade TC performance. The 1N4570 datasheet confirms that voltage measurements must be taken 15 seconds after applying this exact dc current.

Is 1N4570 suitable for military applications?

Yes - the 1N4570 can be ordered in qualified military versions by adding appropriate prefixes (JAN, JANTX, or JANTXV) and the "-1" suffix, e.g., JANTX1N4570-1, which meets MIL-PRF-19500/452 requirements. The base 1N4570 itself is not qualified, but its DO-7 construction, hermetic sealing, and –65 °C to +175 °C rating provide the foundational reliability needed for such upgrades.

What is the maximum power dissipation for 1N4570?

The 1N4570 has a maximum DC power dissipation of 500 mW at lead temperature (T_L) = 25 °C, with a maximum Zener current (I_ZM) of 70 mA. However, for optimal voltage-temperature stability, the datasheet specifies operation below 30 mW - consistent with its 0.5 mA I_ZT and 6.4 V V_Z, yielding ~3.2 mW typical dissipation in reference configurations.

Does 1N4570 have ESD protection?

The 1N4570 is nonsensitive to ESD per MIL-STD-750 Method 1020, meaning it does not require special ESD handling during PCB assembly or testing. This behavior stems from its metallurgically bonded structure and hermetic DO-7 package, not external protection circuitry. No additional ESD safeguards are needed when integrating the 1N4570 into production lines.

How does the temperature coefficient of 1N4570 compare to standard Zener diodes?

At 0.01 %/°C, the 1N4570's temperature coefficient is up to 10× lower than typical 5–6 V Zeners (which often exhibit 0.05–0.1 %/°C). This ultra-low TC is achieved through proprietary temperature-compensation design, not just process optimization. As a result, the 1N4570 delivers ≤0.64 mV/°C drift - essential for applications where reference stability dominates overall system error budget.