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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Microchip Technology 1N4573A-1E3/TR

Name: 1N4573A-1E3/TR
Brand: Microchip Technology
SKU: 1N4573A-1E3/TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N4573A-1E3/TR

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: -

Datasheet:: 1N4573A-1E3/TR.pdf

Description:: DIODE ZENER TEMP COMPENSATED

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Product details

Overview

1N4573A-1E3/TR from Microsemi is a temperature-compensated 6.4 V Zener reference diode in DO-7 (DO-204AA) glass axial package, rated for 1.0 mA test current, ±0.001%/°C temperature coefficient, and 100 Ω dynamic impedance at I_ZT, used in precision voltage references for aerospace instrumentation and high-reliability analog circuits.

For engineers reviewing the 1N4573A-1E3/TR datasheet, 1N4573A-1E3/TR pinout, 1N4573A-1E3/TR application, or 1N4573A-1E3/TR equivalent, key selection criteria include its 6.4 V nominal Zener voltage with ±5% tolerance, hermetic glass DO-7 packaging, military-grade temperature stability (–65°C to +175°C), and low TC performance under 1.0 mA bias.

Technical Context

This device belongs to Microsemi's 1N4565–1N4584A-1 series of zero-TC Zener reference diodes, engineered using internal metallurgical bonding to minimize voltage drift across temperature. Its 6.4 V nominal Zener voltage is stabilized by dual-junction compensation architecture.

The 1N4573A-1E3/TR operates at 1.0 mA Zener test current (I_ZT) and delivers 100 Ω dynamic impedance (Z_ZT) at that bias point. It exhibits ±0.001%/°C temperature coefficient over –55°C to +100°C, enabling stable reference operation without external trimming.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	6.4 V ±5% at I_ZT = 1.0 mA - defines primary reference accuracy under standard test conditions
Temperature Coefficient (αV_Z)	±0.001%/°C - ensures minimal voltage drift over –55°C to +100°C operating range
Zener Test Current (I_ZT)	1.0 mA - required bias current to achieve specified V_Z and TC performance
Dynamic Impedance (Z_ZT)	100 Ω at I_ZT = 1.0 mA - determines load regulation sensitivity and noise rejection capability
Max Reverse Current (I_R)	2.0 µA at 3 V - confirms low leakage for high-impedance reference node integrity
Power Dissipation	500 mW @ T_L = 25°C - supports robust thermal margin in through-hole mounted designs
Operating Temperature	–65°C to +175°C - enables deployment in extended-environment avionics and downhole electronics

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 indicated by band; polarity requires banded end positive relative to unbanded end.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unbanded end)	Reference ground reference node	Connected to circuit common; establishes return path for Zener bias current
Cathode (banded end)	Stable 6.4 V output node	Provides regulated voltage source; must be biased positively relative to anode

Key Features

Feature	Design Value
Temperature-compensated Zener structure	Internal dual-junction metallurgical bond achieves ±0.001%/°C TC over –55°C to +100°C
Hermetic glass DO-7 package	Enables long-term stability and reliability in harsh environments including vacuum and radiation exposure
MIL-PRF-19500/452 qualification option	Add "-1" suffix (e.g., 1N4573A-1) to enable JAN/JANTX/JANTXV military screening and traceability
ESD immunity	Nonsensitive to ESD per MIL-STD-750 Method 1020 - eliminates need for handling safeguards during assembly
Tape-and-reel packaging	"TR" suffix denotes EIA-296 compliant tape-and-reel - supports automated SMT-compatible placement despite axial form factor

Applications

Aerospace Instrumentation Reference	Downhole Oil & Gas Sensor Calibration
Use Scenario: Precision analog front-end in satellite telemetry systems requiring stable 6.4 V reference over wide thermal excursions. IC Role / Device Role / Timing Role: Primary voltage reference for ADC/DAC biasing and sensor signal conditioning. Use Value: ±0.001%/°C TC ensures ≤0.7 mV drift across –55°C to +100°C, eliminating recalibration cycles.	Use Scenario: High-temperature pressure transducer modules deployed in oil well logging tools. IC Role / Device Role / Timing Role: Stable excitation reference for Wheatstone bridge sensors operating up to +175°C. Use Value: Hermetic DO-7 package and –65°C to +175°C rating maintain calibration integrity under extreme thermal cycling.
Military Avionics Power Monitoring	High-Reliability Medical Imaging Bias Supply
Use Scenario: Voltage monitoring circuit in flight control computers where reference stability directly impacts fault detection accuracy. IC Role / Device Role / Timing Role: Reference element in comparator-based overvoltage/undervoltage detection. Use Value: 2.0 µA max reverse leakage at 3 V prevents false triggering in high-impedance sense networks.	Use Scenario: Bias supply reference for X-ray detector ASICs requiring ultra-low noise and long-term drift stability. IC Role / Device Role / Timing Role: Low-noise 6.4 V reference for analog signal chain power rails and gain-setting networks. Use Value: 100 Ω Z_ZT at 1.0 mA minimizes AC ripple coupling into sensitive imaging front-ends.

Aerospace Instrumentation Reference

Downhole Oil & Gas Sensor Calibration

Use Scenario: Precision analog front-end in satellite telemetry systems requiring stable 6.4 V reference over wide thermal excursions.

IC Role / Device Role / Timing Role: Primary voltage reference for ADC/DAC biasing and sensor signal conditioning.

Use Value: ±0.001%/°C TC ensures ≤0.7 mV drift across –55°C to +100°C, eliminating recalibration cycles.

Use Scenario: High-temperature pressure transducer modules deployed in oil well logging tools.

IC Role / Device Role / Timing Role: Stable excitation reference for Wheatstone bridge sensors operating up to +175°C.

Use Value: Hermetic DO-7 package and –65°C to +175°C rating maintain calibration integrity under extreme thermal cycling.

Military Avionics Power Monitoring

High-Reliability Medical Imaging Bias Supply

Use Scenario: Voltage monitoring circuit in flight control computers where reference stability directly impacts fault detection accuracy.

IC Role / Device Role / Timing Role: Reference element in comparator-based overvoltage/undervoltage detection.

Use Value: 2.0 µA max reverse leakage at 3 V prevents false triggering in high-impedance sense networks.

Use Scenario: Bias supply reference for X-ray detector ASICs requiring ultra-low noise and long-term drift stability.

IC Role / Device Role / Timing Role: Low-noise 6.4 V reference for analog signal chain power rails and gain-setting networks.

Use Value: 100 Ω Z_ZT at 1.0 mA minimizes AC ripple coupling into sensitive imaging front-ends.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4573A-1	Same electrical specs but includes MIL-PRF-19500/452 JANTXV screening and full military traceability	Required for DoD procurement and space-qualified systems with formal qualification documentation	Select when compliance with MIL-PRF-19500/452 Class V (JANTXV) is mandatory
1N4572A-1E3/TR	Identical DO-7 package and 1.0 mA I_ZT, but ±0.002%/°C TC (0.13 mV/°C) vs. 0.06 mV/°C for 1N4573A-1E3/TR	Suitable where slightly relaxed TC meets system budget, enabling cost optimization without layout change	Choose when ±0.002%/°C TC satisfies drift requirements and lower-cost sourcing is prioritized

Compared with 1N4573A-1E3/TR, the 1N4573A-1 offers identical performance with added military qualification, while 1N4572A-1E3/TR trades 2× higher TC for potential cost reduction-neither is pin-compatible drop-in replacement due to distinct TC grading and screening status.

Availability

1N4573A-1E3/TR is available at Aetrix Electronics and suitable for aerospace instrumentation, downhole sensor calibration, and military avionics requiring stable component supply with full traceability and extended temperature support.

Supply support for 1N4573A-1E3/TR 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 1N4565–1N4584A-1 series was designed specifically for mission-critical voltage reference applications demanding ultra-low temperature coefficients and hermetic packaging stability across extreme environmental conditions.

FAQ

What is the Zener voltage tolerance for 1N4573A-1E3/TR?

The 1N4573A-1E3/TR has a nominal Zener voltage of 6.4 V with a tolerance of ±5% at I_ZT = 1.0 mA and 25°C. Tighter tolerances (e.g., ±1%, ±2%) are available via custom ordering suffixes like "-1%" or "-2%", but the base 1N4573A-1E3/TR adheres to the standard ±5% specification defined in the Microsemi datasheet.

Does 1N4573A-1E3/TR require a heatsink in normal operation?

No, the 1N4573A-1E3/TR does not require a heatsink under typical operating conditions. With a maximum power dissipation of 500 mW at 25°C lead temperature and intended use at 1.0 mA bias (≈6.4 mW), thermal rise is negligible. Its DO-7 package relies on lead conduction, and operation within the 30 mW recommended limit ensures no thermal derating is needed.

Is 1N4573A-1E3/TR compatible with lead-free soldering processes?

The 1N4573A-1E3/TR features tin-lead plated leads per MIL-STD-750 Method 2026 and is rated for soldering at 260°C for 10 seconds maximum. While it supports conventional SnPb reflow, it is not qualified for Pb-free (RoHS-compliant) soldering profiles. For lead-free assembly, Microsemi recommends verifying compatibility with actual process validation or selecting a RoHS-qualified alternative.

Can 1N4573A-1E3/TR be used in reverse-biased configuration only?

Yes, the 1N4573A-1E3/TR functions exclusively as a reverse-biased Zener diode. It must be operated with the cathode (banded end) positive relative to the anode. Forward conduction is not a designed operating mode, and forward voltage characteristics are unspecified. Its 6.4 V reference behavior is valid only under controlled reverse bias at I_ZT = 1.0 mA.

What is the maximum reverse leakage current for 1N4573A-1E3/TR at 3 V?

The maximum reverse leakage current (I_R) for 1N4573A-1E3/TR is 2.0 µA at 3 V and 25°C, as specified in the Electrical Characteristics table. This low leakage ensures minimal error contribution in high-impedance reference nodes and supports accurate biasing in precision analog circuits without loading effects.

1N4573A-1E3/TR Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: -

Tolerance:: -

Power - Max:: -

Impedance (Max) (Zzt):: -

Current - Reverse Leakage @ Vr:: -

Voltage - Forward (Vf) (Max) @ If:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

1N4573A-1E3/TR FAQ

1.How can I place an order for 1N4573A-1E3/TR through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N4573A-1E3/TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 1N4573A-1E3/TR reliable?

The price and inventory of 1N4573A-1E3/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4573A-1E3/TR is usually 5 days.

3.What payment methods are accepted for 1N4573A-1E3/TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4573A-1E3/TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N4573A-1E3/TR?

1N4573A-1E3/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N4573A-1E3/TR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 1N4573A-1E3/TR?

For technical support, including 1N4573A-1E3/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4573A-1E3/TR requirements.

6.How does Aetrix verify that 1N4573A-1E3/TR is sourced from the original manufacturer or authorized distributors?

All 1N4573A-1E3/TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1N4573A-1E3/TR meets industry standards.

7.What is the process for return or replacement of 1N4573A-1E3/TR?

All 1N4573A-1E3/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4573A-1E3/TR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 1N4573A-1E3/TR part is unused and in its original packaging.

Return procedure for 1N4573A-1E3/TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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