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Microchip Technology 1N4573A
- Part No.:
- 1N4573A
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4573A.pdf
- Description:
- DIODE ZENER 6.4V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:2,441
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Product details
Overview
1N4573A from Microsemi is a 6.4 V temperature-compensated Zener reference diode in DO-7 (DO-204AA) glass axial package, rated for 1.0 mA Zener test current, 0.001 %/°C temperature coefficient, and 100 Ω dynamic impedance at IZT. It delivers stable voltage reference performance across -55°C to +100°C operating range and is qualified for high-reliability instrumentation and aerospace power supply feedback loops.
For engineers reviewing the 1N4573A datasheet, 1N4573A pinout, 1N4573A application, or 1N4573A equivalent, this part supports precision analog systems requiring low-drift, hermetically sealed, military-grade voltage references with verified thermal stability and tight initial tolerance options.
Technical Context
The 1N4573A uses internal metallurgical bonding to achieve ultra-low temperature coefficient (0.001 %/°C) by balancing positive and negative TC components within the Zener junction. Its 6.4 V nominal voltage is optimized for minimal curvature in the VZ vs. temperature curve over -55°C to +100°C.
Designed for operation at 1.0 mA test current, it maintains ≤100 Ω dynamic impedance (ZZT) and exhibits ≤2.0 µA reverse leakage at 3 V. The DO-7 glass package ensures hermetic sealing, ESD immunity per MIL-STD-750 Method 1020, and compatibility with 260°C soldering profiles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.4 V ±5% nominal - provides stable reference point for analog calibration and feedback control circuits |
| Zener Test Current (IZT) | 1.0 mA - defines the bias condition under which VZ and TC are specified and optimized |
| Temperature Coefficient (αVZ) | 0.001 %/°C - enables <0.1 mV/°C drift over full operating range, critical for precision metrology |
| Dynamic Impedance (ZZT) | 100 Ω @ IZT - limits output voltage variation under load transients in regulated supplies |
| Max Reverse Current (IR) | 2.0 µA @ 3 V - ensures negligible error contribution in high-impedance reference divider networks |
| Operating Temperature Range | -55°C to +100°C - supports deployment in extended-environment avionics and downhole instrumentation |
| Package | DO-7 (DO-204AA) glass axial - hermetically sealed, MIL-qualified mechanical form factor with tin-lead leads |
Pinout & Package
DO-7 (DO-204AA) glass axial-leaded package: hermetically sealed cylindrical glass body with two tinned copper alloy leads; cathode identified by black band; polarity requires banded end to be positive during operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded lead) | Reference ground reference node | Connected to circuit common; establishes return path for Zener bias current |
| Cathode (banded lead) | Stable voltage output node | Delivers regulated 6.4 V when reverse-biased; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Temperature compensation architecture | Engineered TC of 0.001 %/°C minimizes VZ drift without external trimming components |
| Hermetic glass encapsulation | DO-7 package prevents moisture ingress and long-term parameter shift in harsh environments |
| MIL-PRF-19500/452 qualification readiness | Supports JAN/JANTX/JANTXV variants with "-1" suffix for flight-critical and defense applications |
| Nonsensitive to ESD | Complies with MIL-STD-750 Method 1020 - eliminates need for handling safeguards in assembly |
| Flexible tolerance options | Tighter tolerances (e.g., -1%, -2%) available via suffix - enables binning for high-accuracy system calibration |
Applications
| High-Precision ADC Reference | Aerospace Power Supply Feedback |
|---|---|
Use Scenario: Reference input for 16-bit+ successive-approximation ADCs in satellite telemetry systems. IC Role / Device Role / Timing Role: Provides stable 6.4 V基准 voltage for ADC internal scaling and offset correction. Use Value: 0.001 %/°C TC ensures <±0.5 LSB error over -55°C to +100°C, eliminating recalibration cycles. |
Use Scenario: Voltage sensing node in radiation-hardened DC-DC converter feedback loop. IC Role / Device Role / Timing Role: Sets output regulation threshold for isolated flyback controller in launch vehicle power modules. Use Value: Hermetic DO-7 package and MIL-qualified variants ensure reliability under thermal cycling and vacuum exposure. |
| Calibration Standard for DMMs | Downhole Oilfield Sensor Excitation |
Use Scenario: Primary reference in portable handheld digital multimeters requiring NIST-traceable accuracy. IC Role / Device Role / Timing Role: Serves as factory-calibrated voltage source for auto-ranging and gain adjustment. Use Value: 6.4 V nominal value aligns with standard 10 V reference ladder ratios; ±5% base tolerance supports post-cal trim. |
Use Scenario: Excitation source for strain-gauge bridges in deep-well pressure transducers. IC Role / Device Role / Timing Role: Supplies stable bias to Wheatstone bridge under extreme ambient temperatures up to +175°C. Use Value: Extended storage range (-65°C to +175°C) and low TC enable operation without active thermal management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4572A | Same DO-7 package and 1.0 mA IZT, but 0.002 %/°C TC (2× higher drift) | Suitable where ±0.2 mV/°C drift is acceptable, e.g., non-critical industrial sensors | Select when lower cost is prioritized over ultra-stable TC; identical footprint and biasing |
| 1N4574A | Same DO-7 package and 1.0 mA IZT, but 0.0005 %/°C TC (5× lower drift) | Required for metrology-grade instruments demanding sub-0.1 mV/°C stability | Choose when ultimate thermal stability justifies tighter process control and potential cost premium |
Compared with 1N4572A and 1N4574A, the 1N4573A strikes a balanced trade-off between TC performance (0.001 %/°C), availability, and cost-making it optimal for aerospace power monitoring and mid-tier precision instrumentation where 0.002 %/°C is insufficient but 0.0005 %/°C is over-specified.
Availability
1N4573A is available at Aetrix Electronics and suitable for high-reliability power supply feedback, precision analog calibration, and aerospace sensor excitation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1N4573A 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-tolerant, and military-qualified analog and mixed-signal components.
The 1N4573A belongs to Microsemi's Scottsdale Division legacy Zener reference diode family, engineered specifically for applications demanding ultra-low TC, hermetic packaging, and MIL-PRF-19500 compliance in aerospace, defense, and energy exploration.
FAQ
What is the Zener test current for 1N4573A?
The 1N4573A is specified at a Zener test current (IZT) of 1.0 mA. This current defines the operating point at which its 6.4 V nominal voltage, 0.001 %/°C temperature coefficient, and 100 Ω dynamic impedance are measured and guaranteed. Operating significantly above or below this current may increase TC deviation and impedance, so biasing near 1.0 mA is recommended for optimal 1N4573A performance.
Is 1N4573A hermetically sealed?
Yes, the 1N4573A uses a hermetically sealed glass DO-7 (DO-204AA) package, as confirmed in the Microsemi datasheet. This construction prevents moisture ingress and ensures long-term parameter stability in humid, high-vibration, or vacuum environments-critical for aerospace and downhole applications where the 1N4573A is commonly deployed.
Does 1N4573A meet military specifications?
The base 1N4573A is JEDEC-registered and designed to support MIL-PRF-19500/452 qualification. When ordered with prefixes (e.g., JANTX1N4573A-1), it meets full JAN, JANTX, or JANTXV requirements-including extended temperature testing, lot traceability, and screening. The 1N4573A itself serves as the commercial baseline for these qualified variants.
What is the maximum operating temperature for 1N4573A?
The 1N4573A has a specified operating temperature range of -55°C to +100°C, with storage capability from -65°C to +175°C. Its low 0.001 %/°C temperature coefficient remains valid across the full -55°C to +100°C range, enabling reliable use in engine-mounted avionics and oilfield electronics where the 1N4573A maintains reference integrity without thermal compensation circuitry.
Can 1N4573A be used in place of 1N4574A?
The 1N4573A and 1N4574A share identical DO-7 packaging, 1.0 mA IZT, and 6.4 V nominal voltage-but differ in temperature coefficient (0.001 %/°C vs. 0.0005 %/°C). Substituting 1N4573A for 1N4574A is electrically feasible and mechanically compatible, but introduces ~0.05 mV/°C additional drift. System-level validation is required before using 1N4573A in applications originally designed for the tighter TC of 1N4574A.
1N4573A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, 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-204AH (DO-35)
1N4573A FAQ
1.How can I place an order for 1N4573A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4573A 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 reliable?
The price and inventory of 1N4573A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4573A is usually 5 days.
3.What payment methods are accepted for 1N4573A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4573A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4573A?
1N4573A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4573A 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?
For technical support, including 1N4573A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4573A requirements.
6.How does Aetrix verify that 1N4573A is sourced from the original manufacturer or authorized distributors?
All 1N4573A 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 meets industry standards.
7.What is the process for return or replacement of 1N4573A?
All 1N4573A units undergo pre-shipment inspection (PSI). If there is an issue with 1N4573A, 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 part is unused and in its original packaging.
Return procedure for 1N4573A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4573A Tags
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