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Microchip Technology 1N4573
- Part No.:
- 1N4573
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N4573.pdf
- Description:
- DIODE ZENER 6.4V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:8,024
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Product details
Overview
1N4573 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, 100 Ω dynamic impedance, and operation from –65°C to +175°C. It delivers high-stability voltage referencing in precision instrumentation, aerospace power supplies, and military-grade analog circuits.
For engineers reviewing the 1N4573 datasheet, 1N4573 pinout, 1N4573 application, or 1N4573 equivalent, key selection criteria include its ultra-low TC (0.001%/°C), tight thermal stability over –55°C to +100°C, hermetic glass DO-7 packaging, MIL-PRF-19500/452 qualification readiness, and compatibility with 1.0 mA biasing for optimal Zener voltage regulation.
Technical Context
The 1N4573 uses internal metallurgical bonding to achieve temperature compensation across its 6.4 V nominal Zener voltage, minimizing drift via matched junction characteristics. Its 0.001%/°C TC is specified over –55°C to +100°C, with Zener test current fixed at 1.0 mA and dynamic impedance measured at 100 Ω.
This device operates as a two-terminal, cathode-banded reference diode requiring reverse-bias polarity (banded end positive). It supports stable DC referencing without external compensation networks and meets MIL-STD-750 ESD immunity requirements per Method 1020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 6.4 V ±5% - provides stable reference point for analog signal conditioning and calibration circuits |
| Zener Test Current (IZT) | 1.0 mA - operating point where voltage and TC are guaranteed; design must bias at this current for spec compliance |
| Temperature Coefficient (αVZ) | 0.001%/°C - enables <0.1 mV/°C drift over –55°C to +100°C, critical for high-accuracy measurement systems |
| Dynamic Impedance (ZZT) | 100 Ω @ IZT - low AC impedance ensures minimal output voltage variation under load transients |
| Max Reverse Current (IR) | 2.0 µA @ 3 V - confirms low leakage below breakdown, supporting high-impedance reference node integrity |
| Operating Temperature Range | –65°C to +175°C - supports deployment in extreme-environment avionics, downhole tools, and space-qualified electronics |
| Package | DO-7 (DO-204AA) - hermetically sealed glass axial package with tin-lead solderable leads per MIL-STD-750 Method 2026 |
Pinout & Package
DO-7 (DO-204AA) glass axial-leaded package with cathode band marking; terminals are unidirectional anode/cathode leads. Polarity requires banded (cathode) end to be biased positive relative to the anode for proper Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground reference node | Connected to circuit common; defines 0 V reference for Zener voltage drop across device |
| Cathode (banded end) | Positive reference output terminal | Biased positive relative to anode; delivers regulated 6.4 V reference potential to load or feedback network |
Key Features
| Feature | Design Value |
|---|---|
| Temperature-compensated Zener structure | 0.001%/°C TC achieved via internal metallurgical bonding-eliminates need for external compensation components |
| Hermetic glass DO-7 package | Sealed construction ensures long-term parameter stability and immunity to humidity-induced degradation |
| MIL-PRF-19500/452 qualification path | Add JAN/JANTX/JANTXV prefix + "-1" suffix (e.g., JANTX1N4573-1) for military-grade screening and traceability |
| ESD robustness | Non-sensitive to electrostatic discharge per MIL-STD-750 Method 1020-reduces handling risk in production environments |
| Flexible tolerance options | Tighter voltage tolerances (e.g., ±1%, ±2%) available via suffix notation (e.g., 1N4573A-1%) without redesign |
Applications
| High-Accuracy Instrumentation Calibration | Aerospace Power Supply Reference |
|---|---|
Use Scenario: Precision multimeters and automated test equipment require sub-10 ppm/°C reference stability over extended temperature excursions. IC Role / Device Role / Timing Role: Primary voltage reference for ADC/DAC offset trimming and gain calibration loops. Use Value: 0.001%/°C TC and 100 Ω ZZT ensure <±0.5 mV drift over –55°C to +100°C, meeting Class A metrology requirements. |
Use Scenario: Avionics DC-DC converters demand radiation-tolerant, thermally stable references for closed-loop regulation. IC Role / Device Role / Timing Role: Feedback node reference for error amplifiers in isolated flyback and forward converters. Use Value: Hermetic DO-7 package and –65°C to +175°C rating support operation in engine bay and cabin power systems. |
| Military Analog Signal Conditioning | Downhole Oilfield Sensor Electronics |
Use Scenario: Tactical radios and secure comms modules require MIL-qualified references that maintain accuracy under shock/vibration. IC Role / Device Role / Timing Role: Biasing reference for op-amp-based active filters and RF front-end AGC circuits. Use Value: JANTX-qualified variants (e.g., JANTX1N4573-1) provide full MIL-PRF-19500/452 screening and lot traceability. |
Use Scenario: Pressure/temperature sensors deployed in oil/gas wellbores operate continuously above 150°C ambient. IC Role / Device Role / Timing Role: Stable excitation source for Wheatstone bridge strain gauges and RTD interfaces. Use Value: Guaranteed operation up to +175°C with <2 µA leakage at 3 V enables reliable low-power sensor biasing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4572A | Same DO-7 package and 6.4 V nominal voltage, but 0.002%/°C TC (2× higher drift) and 1.0 mA IZT | Suitable for less demanding industrial controls where ±1 mV/°C drift is acceptable | Select 1N4572A only if cost sensitivity outweighs thermal stability requirements; verify system-level TC budget allows 0.002%/°C. |
| 1N4574A | Identical package and voltage, but 0.0005%/°C TC (5× lower drift) and same 1.0 mA IZT | Preferred for satellite payload references and quantum sensor biasing requiring ultra-low thermal hysteresis | Choose 1N4574A when system-level accuracy mandates <0.05 mV/°C drift; note tighter TC increases unit cost and may require tighter IZT control. |
Compared with 1N4573, 1N4572A trades thermal precision for cost efficiency in mid-tier applications, while 1N4574A delivers superior TC performance for mission-critical systems-both share identical pinout, biasing, and packaging, enabling direct substitution with design validation.
Availability
1N4573 is available at Aetrix Electronics and suitable for high-reliability aerospace power supplies, military analog signal chains, and downhole sensor electronics requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N4573 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 1N4573 belongs to Microsemi's legacy Scottsdale Division zero-TC Zener reference diode family, engineered specifically for applications demanding minimal voltage drift across extreme temperatures and harsh operational environments.
FAQ
What is the Zener test current for 1N4573 and why is it critical?
The Zener test current for 1N4573 is 1.0 mA. This current defines the operating point at which the 6.4 V nominal voltage and 0.001%/°C temperature coefficient are guaranteed. Deviating significantly from 1.0 mA alters both voltage accuracy and TC behavior-designs must regulate bias current to this value using series resistors or active current sources to meet datasheet specifications for 1N4573.
Does 1N4573 have military qualification, and how is it ordered?
Yes, 1N4573 supports military qualification under MIL-PRF-19500/452. To order qualified versions, add the appropriate prefix (JAN, JANTX, or JANTXV) and the "-1" suffix-for example, JANTX1N4573-1. These variants undergo enhanced screening, lot traceability, and environmental testing beyond commercial-grade 1N4573 units.
What is the maximum operating temperature of 1N4573, and how does it affect reliability?
The 1N4573 operates from –65°C to +175°C. Its hermetic DO-7 glass package and internal metallurgical bonding preserve parametric stability at high temperatures, making it suitable for engine-mounted electronics and downhole tools. At +175°C, leakage remains below specification limits, ensuring continued reference integrity without derating in 1N4573 designs.
Can 1N4573 be used in surface-mount applications?
No-1N4573 is exclusively offered in the axial-leaded DO-7 (DO-204AA) through-hole package. For surface-mount equivalents, Microsemi offers UR-1 suffix variants in DO-213AA (e.g., JANTX1N4573AUR-1), but these are distinct orderable parts with different mechanical form factors and thermal profiles than the standard 1N4573.
How does the 0.001%/°C temperature coefficient of 1N4573 translate to actual voltage drift?
At 0.001%/°C, the 1N4573 exhibits approximately 0.064 mV/°C drift around its 6.4 V nominal voltage. Over a –55°C to +100°C range (155°C span), total drift is ≤ ±10 mV-enabling use in applications like precision data acquisition where reference stability directly impacts measurement resolution and repeatability of 1N4573-based circuits.
1N4573 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AA, DO-7, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 6.4 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 3 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-7
1N4573 FAQ
1.How can I place an order for 1N4573 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4573 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 1N4573 reliable?
The price and inventory of 1N4573 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4573 is usually 5 days.
3.What payment methods are accepted for 1N4573?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4573 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4573?
1N4573 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4573 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 1N4573?
For technical support, including 1N4573 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4573 requirements.
6.How does Aetrix verify that 1N4573 is sourced from the original manufacturer or authorized distributors?
All 1N4573 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 1N4573 meets industry standards.
7.What is the process for return or replacement of 1N4573?
All 1N4573 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4573, 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 1N4573 part is unused and in its original packaging.
Return procedure for 1N4573:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4573 Tags
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