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Microchip Technology 1N4566A
- Part No.:
- 1N4566A
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4566A.pdf
- Description:
- DIODE ZENER 6.4V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:9,661
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Product details
Overview
1N4566A 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, ±0.005 %/°C temperature coefficient, and 200 Ω dynamic impedance at IZT. It delivers stable voltage reference performance across -55°C to +100°C operating range and is qualified to MIL-PRF-19500/452 with JANTXV option.
For engineers reviewing the 1N4566A datasheet, 1N4566A pinout, 1N4566A application, or 1N4566A equivalent, key selection criteria include its ultra-low TC (0.005 %/°C), tight 6.4 V nominal tolerance, hermetic DO-7 packaging, military-grade reliability, and suitability for precision analog instrumentation requiring minimal drift over temperature and time.
Technical Context
The 1N4566A implements a metallurgically bonded Zener junction optimized for temperature compensation via internal series/parallel diode stacking, achieving ±0.005 %/°C TC over -55°C to +100°C. Its 0.5 mA test current ensures low power dissipation (<30 mW) while maintaining voltage stability.
Designed for operation with cathode band positive relative to anode, it supports reverse-biased reference use only. The DO-7 package provides hermetic glass sealing, tin-lead solderable leads per MIL-STD-750 Method 2026, and ESD immunity per MIL-STD-750 Method 1020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.4 V ±5% nominal - defines primary reference level for analog calibration circuits |
| Temperature Coefficient (αVZ) | ±0.005 %/°C - enables <0.5 mV drift over full -55°C to +100°C operating range |
| Zener Test Current (IZT) | 0.5 mA - sets optimal bias point for minimum TC and impedance; power <30 mW |
| Dynamic Impedance (ZZT) | 200 Ω @ IZT - limits output voltage variation under load transients |
| Max Reverse Current (IR) | 2.0 µA @ 3 V - ensures negligible leakage error in high-impedance reference paths |
| Operating Temperature Range | -55°C to +100°C - supports aerospace, downhole, and industrial environments |
| Package | DO-7 (DO-204AA) - hermetically sealed glass axial package with cathode band marking |
Pinout & Package
DO-7 (DO-204AA) glass axial-leaded package with cathode band indicating the positive terminal when operated as a reference diode. Leads are tin-lead plated and solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground reference node | Connected to circuit common; reverse-bias return path for Zener current |
| Cathode (banded end) | Stable voltage output node | Provides +6.4 V reference potential relative to anode; must be held positive |
Key Features
| Feature | Design Value |
|---|---|
| Temperature-compensated Zener structure | Metallurgical bonding enables ±0.005 %/°C TC without external components |
| MIL-PRF-19500/452 qualification option | JANTXV prefix + "-1" suffix available for space-qualified designs (e.g., JANTXV1N4566A-1) |
| Hermetic glass DO-7 package | Prevents moisture ingress and long-term parameter drift in harsh environments |
| Nonsensitive to ESD | Complies with MIL-STD-750 Method 1020 - no handling precautions required |
| Flexible tolerance options | Tighter tolerances (e.g., ±1%, ±2%) added via suffix (e.g., 1N4566A-1%) |
Applications
| High-Precision ADC Reference | Aerospace Power Supply Trim |
|---|---|
Use Scenario: Reference input for 16-bit SAR ADCs in satellite telemetry systems where thermal cycling occurs between -55°C and +100°C. IC Role / Device Role / Timing Role: Provides stable 6.4 V reference voltage to ADC voltage reference pin, replacing less stable bandgap sources. Use Value: ±0.005 %/°C TC ensures <±0.3 mV drift over full temperature range, preserving ADC LSB accuracy without recalibration. |
Use Scenario: Feedback reference in radiation-hardened DC-DC converter used in launch vehicle avionics. IC Role / Device Role / Timing Role: Sets regulated output voltage via optocoupler feedback loop in isolated flyback controller. Use Value: Hermetic DO-7 package and MIL-qualified variants ensure reliability under vibration, thermal shock, and ionizing radiation exposure. |
| Downhole Sensor Calibration | Strain Gauge Bridge Excitation |
Use Scenario: Biasing reference for MEMS pressure sensor signal conditioning in oil/gas well logging tools operating at 175°C ambient. IC Role / Device Role / Timing Role: Supplies excitation voltage to analog front-end instrumentation amplifier stage. Use Value: Stable 6.4 V output at 0.5 mA enables low-power operation while maintaining <0.5 mV total drift over -55°C to +100°C sensing range. |
Use Scenario: Precision excitation source for 350 Ω Wheatstone bridge in structural health monitoring systems. IC Role / Device Role / Timing Role: Delivers constant-voltage excitation to bridge, minimizing output offset drift with temperature. Use Value: 200 Ω dynamic impedance and low TC reduce bridge output nonlinearity caused by reference variation under load changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4566 | No "A" suffix; ±5% VZ tolerance only, same TC (±0.005 %/°C), same IZT (0.5 mA), same ZZT (200 Ω) | Lacks tighter initial tolerance grading; suitable where calibration adjusts for VZ variance | Select 1N4566A when factory-trimmed 6.4 V accuracy is required without post-assembly trimming |
| 1N4567A | Lower TC (±0.002 %/°C), same VZ (6.4 V), same IZT (0.5 mA), same ZZT (200 Ω) | Better drift performance but higher cost; used where <0.2 mV total drift is mandatory | Choose 1N4567A only if system-level drift budget requires improvement beyond ±0.005 %/°C |
Compared with 1N4566 and 1N4567A, the 1N4566A balances ultra-low temperature coefficient, standard JEDEC-compliant 6.4 V reference, and cost-effective DO-7 packaging-making it optimal for calibrated instrumentation where ±0.005 %/°C TC meets specification without over-engineering.
Availability
1N4566A is available at Aetrix Electronics and suitable for high-reliability applications requiring stable component supply, including aerospace power regulation, downhole sensor calibration, and precision data acquisition systems.
Supply support for 1N4566A 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 and RF components for defense, aerospace, and industrial markets.
The 1N4566A belongs to Microsemi's Scottsdale Division legacy Zener reference diode family, engineered specifically for applications demanding minimal voltage drift across extreme temperatures and mission-critical environments.
FAQ
What is the Zener test current for the 1N4566A?
The 1N4566A is specified at a Zener test current (IZT) of 0.5 mA. This current establishes the nominal 6.4 V reference voltage and ensures optimal temperature coefficient performance. Operating significantly above or below this value increases voltage drift and dynamic impedance, so biasing circuits must be designed to maintain ~0.5 mA through the 1N4566A under all conditions.
Does the 1N4566A have military qualification options?
Yes, the 1N4566A supports military qualification via prefix and suffix additions: JANTXV1N4566A-1 meets MIL-PRF-19500/452 Class V requirements. This version includes enhanced screening, extended temperature validation, and traceable lot documentation-critical for flight hardware and defense electronics where the base 1N4566A does not satisfy program-level reliability mandates.
What is the maximum operating temperature range for the 1N4566A?
The 1N4566A operates from -55°C to +100°C, as confirmed in the Electrical Characteristics table. While storage is rated to +175°C, sustained operation above +100°C degrades TC performance and risks long-term parameter shift. For applications exceeding +100°C, such as downhole electronics, derating or alternate parts like 1N4579A (same TC, higher IZT) should be evaluated alongside thermal modeling.
How is polarity marked on the 1N4566A DO-7 package?
The 1N4566A uses a cathode band (a painted or etched ring) on the glass body to indicate the cathode terminal. When used as a voltage reference, the banded end must be held positive relative to the unbanded (anode) end. Reversing polarity subjects the device to forward conduction and invalidates its reference function-no reverse polarity protection is built into the 1N4566A.
Can the 1N4566A be used in surface-mount designs?
No-the 1N4566A is exclusively offered in the axial-leaded DO-7 (DO-204AA) package. Microsemi does provide surface-mount equivalents (e.g., JANTX1N4569AUR-1 in DO-213AA), but those are distinct part numbers with different mechanical and thermal characteristics. Substituting the 1N4566A into SMT layouts requires adapter hardware and invalidates thermal and reliability assumptions made for the DO-7 form factor.
1N4566A 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):
- 200 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)
1N4566A FAQ
1.How can I place an order for 1N4566A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4566A 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 1N4566A reliable?
The price and inventory of 1N4566A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4566A is usually 5 days.
3.What payment methods are accepted for 1N4566A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4566A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4566A?
1N4566A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4566A 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 1N4566A?
For technical support, including 1N4566A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4566A requirements.
6.How does Aetrix verify that 1N4566A is sourced from the original manufacturer or authorized distributors?
All 1N4566A 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 1N4566A meets industry standards.
7.What is the process for return or replacement of 1N4566A?
All 1N4566A units undergo pre-shipment inspection (PSI). If there is an issue with 1N4566A, 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 1N4566A part is unused and in its original packaging.
Return procedure for 1N4566A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4566A Tags
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Diodes Incorporated
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