Microchip Technology 1N4575

Overview

1N4575 from Microsemi is a 6.4 V temperature-compensated Zener reference diode in DO-7 (DO-204AA) glass axial-leaded package, rated for 2.0 mA test current, 0.01 %/°C temperature coefficient, 50 Ω dynamic impedance, and operating temperature range of –65°C to +175°C. It delivers high-stability voltage reference for precision analog circuits requiring minimal drift over temperature.

For engineers reviewing the 1N4575 datasheet, 1N4575 pinout, 1N4575 application, or 1N4575 equivalent, key selection criteria include its 6.4 V nominal Zener voltage with ±5% tolerance, low TC option within the 1N4575–1N4579A group, DO-7 mechanical robustness, and suitability for military-grade instrumentation where long-term stability and hermetic sealing are critical.

Technical Context

The 1N4575 employs internal metallurgical bonding to achieve stable Zener breakdown at 6.4 V under 2.0 mA test current, with temperature compensation engineered to limit voltage drift to just 0.01 %/°C across 0 to +75°C. Its 50 Ω dynamic impedance ensures low AC noise coupling in feedback paths.

This device operates as a two-terminal passive reference element-cathode-banded end must be held positive-and is specified for DC power dissipation up to 500 mW at 25°C lead temperature, though optimal stability is achieved below 30 mW per JEDEC guidelines.

Key Specifications

Pinout & Package

DO-7 (DO-204AA) glass axial-leaded package: hermetically sealed, cathode indicated by band, leads solderable per MIL-STD-750 Method 2026, weight 0.2 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4575, 1N4574A trades higher dynamic impedance for ultra-low TC at reduced test current, while 1N4579A matches 1N4575's I_ZT and Z_ZT but achieves 20× lower TC-making it preferable for mission-critical timing and metrology where thermal drift dominates error budgets.

Availability

1N4575 is available at Aetrix Electronics and suitable for high-reliability instrumentation, avionics power regulation, downhole sensor biasing, and military data acquisition systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 1N4575 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 aerospace, defense, and industrial markets.

The 1N4575 belongs to Microsemi's legacy 1N4565–1N4584A-1 series of temperature-compensated Zener reference diodes, designed specifically for applications demanding long-term voltage stability under extreme thermal and environmental stress.

FAQ

What is the nominal Zener voltage and tolerance of the 1N4575?

The 1N4575 has a nominal Zener voltage of 6.4 V with a standard tolerance of ±5% at 2.0 mA test current. Tighter tolerances (e.g., ±1%, ±2%) are available via suffix notation like 1N4575-1% but require explicit ordering. This 6.4 V point is selected for optimal temperature coefficient balance in silicon Zener structures.

What does the "A" suffix in 1N4575A indicate?

The "A" suffix in 1N4575A denotes a tighter initial Zener voltage tolerance option-typically ±3% instead of ±5%-while retaining identical electrical characteristics including 2.0 mA test current, 0.01 %/°C temperature coefficient, and 50 Ω dynamic impedance. Both 1N4575 and 1N4575A share the same DO-7 package and thermal ratings.

Can the 1N4575 be used in military applications?

Yes-the 1N4575 qualifies for military use when ordered with appropriate prefixes and suffixes: JANTX1N4575A-1 meets MIL-PRF-19500/452 requirements, including screening for temperature cycling, burn-in, and parametric verification. The base 1N4575 is commercial-grade but shares identical die and DO-7 construction.

What is the maximum power dissipation rating for the 1N4575?

The 1N4575 is rated for 500 mW DC power dissipation at 25°C lead temperature (T_L). However, for optimal voltage-temperature stability, operation should remain below 30 mW-achieved by limiting current to ≤2.0 mA at 6.4 V. Exceeding this degrades TC performance and accelerates long-term drift.

How is polarity identified on the 1N4575 DO-7 package?

The 1N4575 uses standard diode polarity marking: a visible cathode band (typically white or silver) encircles the glass body near one lead. During operation, the banded (cathode) end must be held positive relative to the unbanded (anode) end to maintain reverse-biased Zener conduction. Reversing polarity subjects the device to forward conduction only.