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Microchip Technology 1N4574
- Part No.:
- 1N4574
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N4574.pdf
- Description:
- DIODE ZENER 6.4V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:7,447
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Product details
Overview
1N4574 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. It delivers high-stability voltage referencing in precision analog instrumentation and military-grade power supply feedback loops.
For engineers reviewing the 1N4574 datasheet, 1N4574 pinout, 1N4574 application, or 1N4574 equivalent, this part supports low-drift, high-reliability voltage reference design where tight thermal stability and hermetic packaging are required across extended temperature ranges.
Technical Context
The 1N4574 uses internal metallurgical bonding to achieve ultra-low temperature coefficient (0.0005 %/°C) at 1.0 mA test current, with voltage regulation optimized over –55 °C to +100 °C. Its 6.4 V nominal Zener voltage has ±5% tolerance unless tighter options (e.g., -1%, -2%) are specified via suffix.
Designed per MIL-PRF-19500/452, the 1N4574 supports JANTX qualification when ordered as JANTX1N4574A-1. It operates with banded (cathode) end positive and exhibits ESD immunity per MIL-STD-750 Method 1020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.4 V nominal ±5%; defines stable reference point for analog calibration and feedback networks |
| Zener Test Current (IZT) | 1.0 mA; operating point where VZ and temperature coefficient are specified and optimized |
| Temp. Coefficient (αVZ) | 0.0005 %/°C; enables <0.03 mV/°C drift over –55 °C to +100 °C for high-accuracy systems |
| Dynamic Impedance (ZZT) | 100 Ω @ IZT; limits AC ripple coupling into reference node under load variation |
| Max Power Dissipation | 500 mW @ 25 °C case temp; supports robust operation with derating above 25 °C |
| Operating Temp Range | –65 °C to +175 °C; qualified for aerospace, downhole, and military embedded environments |
| Package | DO-7 (DO-204AA); hermetically sealed glass axial-leaded package with tin-lead solderable leads |
Pinout & Package
DO-7 (DO-204AA) hermetically sealed glass package with axial leads. Cathode identified by black band; device operated with banded end positive (anode grounded).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded lead) | Reference ground connection | Low-impedance return path; must be held at system ground potential for proper biasing |
| Cathode (banded lead) | Stable 6.4 V output node | Provides regulated voltage source; connects to error amplifier input or ADC reference input |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low temperature coefficient | 0.0005 %/°C minimizes reference drift in wide-temperature industrial and aerospace applications |
| MIL-PRF-19500/452 qualification path | Supports JANTX1N4574A-1 ordering for screened, tested, and traceable military-grade procurement |
| Hermetic glass DO-7 construction | Ensures long-term parameter stability and moisture resistance in harsh environmental conditions |
| Nonsensitive to ESD | Complies with MIL-STD-750 Method 1020 - no handling precautions needed during assembly |
| Flexible tolerance options | Tighter tolerances (e.g., -1%, -2%) available via suffix - enables binning for high-precision calibration |
Applications
| High-Accuracy Data Acquisition | Aerospace Power Supply Feedback |
|---|---|
Use Scenario: Precision 16-bit+ ADC reference in avionics sensor signal conditioning. IC Role / Device Role / Timing Role: Primary voltage reference for SAR ADC reference input and DAC output calibration. Use Value: 0.0005 %/°C TC ensures <±0.5 mV drift over –55 °C to +100 °C, preserving full-scale accuracy without software correction. |
Use Scenario: Feedback reference in radiation-tolerant DC-DC converter for satellite bus regulation. IC Role / Device Role / Timing Role: Stable 6.4 V setpoint for error amplifier in isolated flyback controller loop. Use Value: Hermetic DO-7 package and –65 °C to +175 °C rating support operation in unheated payload bays and thermal cycling environments. |
| Military Instrumentation Calibration | Downhole Oilfield Electronics |
Use Scenario: Portable field calibrator for pressure transmitters and thermocouple simulators. IC Role / Device Role / Timing Role: Primary reference in battery-powered, handheld metrology equipment. Use Value: 1.0 mA IZT enables low-power operation while maintaining sub-10 ppm/°C stability - extends battery life without sacrificing accuracy. |
Use Scenario: Reference node in high-temperature logging tool electronics deployed at >150 °C wellbore depths. IC Role / Device Role / Timing Role: Voltage reference for analog front-end of MEMS-based inclinometer and gamma-ray spectrometer. Use Value: Validated operation up to +175 °C case temperature allows direct mounting on PCB without heat sinking or derating penalties. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4574A | Same electrical specs but includes tighter initial VZ tolerance option (e.g., -1% suffix); identical DO-7 package and TC | Preferred where factory-binned reference accuracy is required without post-manufacture calibration | Select 1N4574A when tighter initial tolerance (e.g., ±1%) is needed; otherwise 1N4574 suffices for standard ±5% designs |
| LM399H | Monolithic buried-Zener IC with 5 ppm/°C TC, 6.95 V output, and internal heater; requires 10 mA supply and thermal stabilization time | Suitable for lab-grade instruments requiring <0.1 ppm/°C stability; not drop-in due to active circuitry and power needs | Choose LM399H only when ultra-low TC and long-term drift performance outweigh size, power, and startup-time constraints |
Compared with 1N4574A, the 1N4574 offers identical core performance but without guaranteed tighter tolerance options; compared with LM399H, it provides simpler, lower-power, passive referencing without heater control complexity - ideal for embedded, high-temp, or cost-sensitive systems.
Availability
1N4574 is available at Aetrix Electronics and suitable for high-reliability power supply feedback, precision instrumentation calibration, and aerospace sensor signal conditioning requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N4574 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 military-qualified analog and mixed-signal components.
The 1N4574 belongs to Microsemi's Scottsdale Division legacy Zener reference diode family, engineered specifically for ultra-stable voltage referencing in defense, aerospace, and oilfield electronics where hermeticity and extreme temperature resilience are mandatory.
FAQ
What is the Zener voltage tolerance for the standard 1N4574?
The standard 1N4574 has a nominal Zener voltage of 6.4 V with a tolerance of ±5%, as defined in the JEDEC specification. Tighter tolerances such as ±1% or ±2% are available through optional suffixes (e.g., 1N4574A-1%), but those require explicit ordering with the tolerance code appended to the part number. The 1N4574 itself does not include tighter tolerance by default.
Can the 1N4574 be used in surface-mount designs?
No - the 1N4574 is packaged exclusively in the axial-leaded DO-7 (DO-204AA) glass case and is not a surface-mount device. For SMT equivalents, Microsemi offers military-qualified versions in DO-213AA (e.g., JANTX1N4569AUR-1), but the 1N4574 itself requires through-hole mounting with axial lead formation and manual or wave soldering.
What is the maximum operating temperature for the 1N4574?
The 1N4574 is rated for continuous operation from –65 °C to +175 °C, with storage temperature matching that range. Its hermetic glass package and internal metallurgical bonding enable reliable performance at +175 °C case temperature - making it suitable for downhole, engine bay, and spacecraft thermal environments where plastic-packaged alternatives fail.
Does the 1N4574 require external current limiting?
Yes - the 1N4574 must be biased with a series current-limiting resistor to maintain operation near its specified 1.0 mA Zener test current (IZT). Without proper biasing, voltage regulation degrades, and temperature coefficient performance is not guaranteed. The resistor value is calculated using supply voltage, desired IZT, and the 6.4 V reference drop - typical values range from 3.3 kΩ to 10 kΩ depending on supply rail.
Is the 1N4574 compatible with lead-free soldering processes?
No - the 1N4574 features tin-lead plated leads per MIL-STD-750 Method 2026 and is rated for soldering at 260 °C for 10 seconds maximum. Lead-free reflow profiles (typically >260 °C peak, >60 s time above liquidus) exceed its thermal limit and risk glass-to-metal seal integrity. For RoHS-compliant designs, consult Microchip's qualified alternatives or consider requalification testing under controlled conditions.
1N4574 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
1N4574 FAQ
1.How can I place an order for 1N4574 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4574 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 1N4574 reliable?
The price and inventory of 1N4574 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4574 is usually 5 days.
3.What payment methods are accepted for 1N4574?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4574 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4574?
1N4574 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4574 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 1N4574?
For technical support, including 1N4574 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4574 requirements.
6.How does Aetrix verify that 1N4574 is sourced from the original manufacturer or authorized distributors?
All 1N4574 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 1N4574 meets industry standards.
7.What is the process for return or replacement of 1N4574?
All 1N4574 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4574, 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 1N4574 part is unused and in its original packaging.
Return procedure for 1N4574:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4574 Tags
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