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Microchip Technology 1N4574A-1
- Part No.:
- 1N4574A-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4574A-1.pdf
- Description:
- DIODE ZENER 6.4V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:3,535
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Product details
Overview
1N4574A-1 from Microsemi is a 6.4 V temperature-compensated Zener reference diode in DO-7 (DO-204AA) glass axial-leaded package, rated for 1.0 mA Zener test current, 0.0005 %/°C temperature coefficient, 100 Ω dynamic impedance, and operation from –65 °C to +175 °C - used in precision voltage references for aerospace instrumentation and military-grade power supply regulation.
For engineers reviewing the 1N4574A-1 datasheet, 1N4574A-1 pinout, 1N4574A-1 application, or 1N4574A-1 equivalent, key selection criteria include its ultra-low TC (0.0005 %/°C), tight 6.4 V ±5% nominal tolerance, hermetic DO-7 packaging, MIL-PRF-19500/452 qualification readiness via JANTXV prefix, and stable performance at 1.0 mA test current without thermal drift.
Technical Context
This device belongs to Microsemi's zero-temperature-coefficient Zener series, achieving minimal voltage drift through internal metallurgical bonding and dual-Zener compensation architecture. It operates with a fixed 1.0 mA Zener test current (IZT) and delivers 6.4 V nominal output across –65 °C to +175 °C.
The 1N4574A-1 exhibits 100 Ω dynamic impedance at IZT, supports reverse leakage ≤2.0 µA at 3 V, and maintains voltage stability within ±5% of 6.4 V under specified conditions - all verified per JEDEC registered data and MIL-PRF-19500/452 compliance requirements for high-reliability analog references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 6.4 V ±5% - defines primary reference accuracy for calibration-critical circuits |
| Zener Test Current (IZT) | 1.0 mA - required bias current to achieve specified VZ and TC performance |
| Temperature Coefficient (αVZ) | 0.0005 %/°C - enables <±0.5 mV drift over 0–75 °C operating range |
| Dynamic Impedance (ZZT) | 100 Ω @ IZT - ensures low AC noise coupling into reference node |
| Max Reverse Current (IR) | ≤2.0 µA @ 3 V - guarantees minimal leakage-induced error in high-impedance reference paths |
| Operating Temperature Range | –65 °C to +175 °C - supports deployment in extended-environment avionics and downhole electronics |
| Power Dissipation | 500 mW @ TL = 25 °C - allows safe operation with heatsinking; 30 mW max recommended for optimal TC stability |
Pinout & Package
DO-7 (DO-204AA) hermetically sealed glass axial-leaded package with tin-lead plated leads; cathode identified by band; operated with 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 positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low temperature coefficient | 0.0005 %/°C - minimizes voltage drift in wide-temperature military systems |
| Hermetic DO-7 glass package | Sealed construction - ensures long-term reliability and moisture resistance in harsh environments |
| MIL-PRF-19500/452 qualification path | JANTXV prefix support - enables direct upgrade to space-qualified versions without redesign |
| Internal metallurgical bonding | Reduces thermal stress mismatch - critical for maintaining TC stability over thermal cycling |
| Nonsensitive to ESD | Complies with MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling |
Applications
| Avionics Power Monitoring | Missile Guidance Reference |
|---|---|
Use Scenario: Real-time monitoring of 28 V DC bus voltage in flight control computers. IC Role / Device Role / Timing Role: Precision 6.4 V reference for ADC input scaling and comparator threshold setting. Use Value: Enables ±0.5 mV measurement accuracy over –55 °C to +100 °C operational range due to 0.0005 %/°C TC. |
Use Scenario: Stable biasing of analog signal conditioning stages in inertial measurement units. IC Role / Device Role / Timing Role: Low-drift voltage reference for op-amp offset nulling and sensor excitation. Use Value: Maintains <±1 LSB error in 16-bit DAC feedback loops across full military temperature range. |
| Satellite Payload Regulation | Nuclear Instrumentation Calibration |
Use Scenario: Reference source for radiation-hardened LDOs powering star tracker FPGAs. IC Role / Device Role / Timing Role: Primary voltage standard for closed-loop regulation and fault detection thresholds. Use Value: Survives 100 krad(Si) TID when paired with RH-prefix variants; DO-7 package withstands launch vibration. |
Use Scenario: Calibration anchor in portable gamma spectrometers requiring traceable voltage standards. IC Role / Device Role / Timing Role: Bench-level reference for multimeter auto-calibration routines. Use Value: Delivers repeatable 6.4 V output with <0.01% hysteresis after thermal cycling between –65 °C and +175 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4574A | No "-1" suffix; commercial-grade only, not qualified to MIL-PRF-19500/452 | Lacks military screening and extended temperature validation; unsuitable for defense procurement | Select 1N4574A-1 when JANTXV-level reliability, hermeticity verification, and lot traceability are mandatory |
| 1N4573A-1 | 0.001 %/°C TC (2× higher drift) and same 1.0 mA IZT, 100 Ω ZZT | Acceptable where ±1 mV drift over 0–75 °C is tolerable; lower cost alternative | Choose 1N4574A-1 only when sub-millivolt stability is required - e.g., Class A metrology or guidance systems |
Compared with 1N4574A and 1N4573A-1, the 1N4574A-1 uniquely combines MIL-PRF-19500/452 qualification, 0.0005 %/°C TC, and DO-7 hermetic packaging - making it the sole option for mission-critical avionics where voltage reference drift directly impacts navigation integrity.
Availability
1N4574A-1 is available at Aetrix Electronics and suitable for aerospace power monitoring, missile guidance subsystems, and satellite payload regulation requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N4574A-1 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 mixed-signal components for defense, aerospace, and industrial markets.
The 1N4574A-1 belongs to Microsemi's legacy 1N45xxA-1 Zener reference diode family, engineered specifically for ultra-stable voltage referencing in MIL-STD-810G and DO-160-compliant systems where thermal drift must be minimized.
FAQ
What is the Zener test current for 1N4574A-1?
The 1N4574A-1 is specified at a Zener test current (IZT) of 1.0 mA. This current must be applied for 15 seconds before measuring the 6.4 V nominal output to ensure compliance with JEDEC registration and temperature coefficient specifications. Operating significantly above or below this current degrades TC performance and increases dynamic impedance beyond the rated 100 Ω.
Does 1N4574A-1 meet military specifications?
Yes - the "-1" suffix on 1N4574A-1 indicates compliance-ready configuration for MIL-PRF-19500/452 qualification. When ordered with JANTXV prefix (e.g., JANTXV1N4574A-1), the device undergoes full military screening including temperature cycling, burn-in, and lot traceability. The base 1N4574A-1 meets mechanical and electrical specs but requires prefix addition for formal qualification.
What is the maximum operating temperature for 1N4574A-1?
The 1N4574A-1 is rated for continuous operation from –65 °C to +175 °C. Its hermetic DO-7 glass package and internal metallurgical bonding enable reliable performance at the upper limit, validated per MIL-STD-202 test methods. Derating is recommended above 150 °C to maintain long-term TC stability below 0.0005 %/°C.
How does the temperature coefficient of 1N4574A-1 compare to standard Zeners?
The 1N4574A-1 achieves 0.0005 %/°C - over 20× tighter than typical 6.2 V Zeners (≈0.01 %/°C). This is accomplished via dual-Zener compensation and precision doping, resulting in <±0.5 mV total drift from 0 °C to +75 °C. Standard Zeners exhibit >±6 mV drift over the same range, making 1N4574A-1 essential for Class A instrumentation.
Can 1N4574A-1 be used in surface-mount designs?
No - the 1N4574A-1 uses axial-leaded DO-7 (DO-204AA) packaging and is not surface-mount compatible. Microsemi offers surface-mount equivalents such as JANTX1N4569AUR-1 in DO-213AA for SMT assembly, but those are distinct part numbers with different thermal and mechanical characteristics. Retrofitting 1N4574A-1 into SMT footprints is not recommended.
1N4574A-1 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 (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N4574A-1 FAQ
1.How can I place an order for 1N4574A-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4574A-1 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 1N4574A-1 reliable?
The price and inventory of 1N4574A-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4574A-1 is usually 5 days.
3.What payment methods are accepted for 1N4574A-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4574A-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4574A-1?
1N4574A-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4574A-1 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 1N4574A-1?
For technical support, including 1N4574A-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4574A-1 requirements.
6.How does Aetrix verify that 1N4574A-1 is sourced from the original manufacturer or authorized distributors?
All 1N4574A-1 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 1N4574A-1 meets industry standards.
7.What is the process for return or replacement of 1N4574A-1?
All 1N4574A-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4574A-1, 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 1N4574A-1 part is unused and in its original packaging.
Return procedure for 1N4574A-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4574A-1 Tags
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