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Microchip Technology 1N4574A-1E3/TR
- Part No.:
- 1N4574A-1E3/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4574A-1E3/TR.pdf
- Description:
- DIODE ZENER 6.4V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:7,475
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Product details
Overview
1N4574A-1E3/TR 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 at IZT, and operating over –65°C to +175°C. It delivers stable voltage reference in precision instrumentation and military-grade power supply feedback loops.
For engineers reviewing the 1N4574A-1E3/TR datasheet, 1N4574A-1E3/TR pinout, 1N4574A-1E3/TR application, or 1N4574A-1E3/TR equivalent, key selection criteria include its ultra-low TC (0.0005%/°C), tight 6.4 V nominal tolerance, DO-7 hermetic glass construction, MIL-PRF-19500/452 qualification readiness, and TR tape-and-reel packaging for automated assembly.
Technical Context
This device belongs to Microsemi's zero-temperature-coefficient Zener series, using internal metallurgical bonding to achieve minimal voltage drift across temperature. Its 6.4 V nominal Zener voltage is optimized for curvature compensation between intrinsic semiconductor and avalanche breakdown mechanisms.
The 1N4574A-1E3/TR operates at 1.0 mA test current with 100 Ω dynamic impedance and exhibits <2.0 µA reverse leakage at 3 V. It supports full military temperature range (–65°C to +175°C) and is qualified per MIL-STD-750 for ESD immunity (Method 1020).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.4 V nominal ±5%; provides stable reference point for analog signal conditioning and ADC/DAC biasing |
| Temperature Coefficient (αVZ) | ±0.0005%/°C; enables sub-0.1 mV/°C drift over –55°C to +100°C operating range |
| Zener Test Current (IZT) | 1.0 mA; defines optimal bias point for specified VZ and impedance performance |
| Dynamic Impedance (ZZT) | 100 Ω at IZT; ensures low AC error contribution in closed-loop regulator feedback paths |
| Max Reverse Current (IR) | 2.0 µA @ 3 V; guarantees high DC blocking integrity in low-power reference circuits |
| Operating Temperature | –65°C to +175°C; supports deployment in aerospace, downhole, and engine-control environments |
| Package | DO-7 (DO-204AA); hermetically sealed glass axial package with tin-lead solderable leads |
Pinout & Package
DO-7 (DO-204AA) glass axial-leaded package with cathode band marking; leads are tin-lead plated and solderable per MIL-STD-750 Method 2026. Polarity requires banded end to be positive relative to unmarked end during forward-biased operation as a reference diode.
| 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 voltage output node | Delivers regulated 6.4 V when reverse-biased; serves as precision reference source |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low temperature coefficient | ±0.0005%/°C enables <0.03 mV/°C drift over –55°C to +100°C, critical for metrology-grade references |
| Hermetic glass DO-7 package | Ensures long-term parameter stability and moisture resistance in harsh environments |
| MIL-PRF-19500/452 qualification path | Supports JANTXV-level reliability via prefix addition (e.g., JANTXV1N4574A-1), meeting defense/aerospace screening |
| Tape-and-reel packaging (TR suffix) | Enables automated SMT placement compatibility despite axial-leaded form factor |
| Nonsensitive to ESD | Complies with MIL-STD-750 Method 1020, eliminating need for special handling in production |
Applications
| High-Accuracy Data Acquisition Systems | Aerospace Power Supply Feedback |
|---|---|
Use Scenario: Precision 24-bit ADC front-end requiring sub-ppm reference stability over temperature. IC Role / Device Role / Timing Role: Primary voltage reference for analog input scaling and offset calibration. Use Value: 0.0005%/°C TC ensures <±0.02% full-scale error contribution across –40°C to +85°C industrial range. |
Use Scenario: Regulated DC-DC converter in satellite power management unit. IC Role / Device Role / Timing Role: Feedback reference for isolated flyback controller in radiation-tolerant design. Use Value: Hermetic DO-7 package and –65°C to +175°C rating support operation in thermal vacuum and launch vibration environments. |
| Military Instrumentation Calibration | Downhole Oilfield Sensor Electronics |
Use Scenario: Portable field calibrator for pressure transducers and thermocouple simulators. IC Role / Device Role / Timing Role: Stable excitation source for ratiometric sensor bridges and DAC output referencing. Use Value: 1.0 mA IZT and 100 Ω ZZT minimize loading error and enable battery-powered 8-hour runtime. |
Use Scenario: Signal conditioning module deployed in oil/gas wellhead telemetry systems. IC Role / Device Role / Timing Role: Reference for RTD-to-digital conversion under extreme ambient heat. Use Value: Guaranteed operation up to +175°C eliminates need for external thermal derating or heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4574A-1 | No TR suffix; bulk packaging only; identical electrical specs and DO-7 package | Suitable for manual prototyping or low-volume hand-soldered assemblies | Select when tape-and-reel automation is not required and cost-per-unit optimization is prioritized |
| 1N4574A-1E3 | Same TR packaging but without "/TR" suffix in ordering code; identical DO-7 mechanicals and electricals | Used interchangeably in Digi-Key/Mouser listings where /TR is implied by reel packaging | Verify reel quantity and EIA-296 compliance with distributor prior to procurement |
Compared with 1N4574A-1E3/TR, the 1N4574A-1 lacks automated assembly support, while 1N4574A-1E3 omits explicit TR designation-both retain identical reference accuracy, TC, and thermal robustness, making them functionally interchangeable where packaging logistics permit.
Availability
1N4574A-1E3/TR is available at Aetrix Electronics and suitable for high-reliability instrumentation, aerospace power regulation, and downhole sensor electronics requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N4574A-1E3/TR 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 aerospace, defense, and industrial markets.
The 1N4574A-1E3/TR belongs to Microsemi's legacy Scottsdale Division zero-TC Zener reference family, engineered specifically for metrology-grade voltage stability in mission-critical systems where parametric drift must be minimized.
FAQ
What is the Zener voltage tolerance for 1N4574A-1E3/TR?
The 1N4574A-1E3/TR has a nominal Zener voltage of 6.4 V with a standard tolerance of ±5%. Tighter tolerances (e.g., ±1%, ±2%) are available via custom suffixes like "-1%" added to the base part number, but the standard 1N4574A-1E3/TR ships at ±5% unless otherwise specified on the order.
Is 1N4574A-1E3/TR qualified to MIL-PRF-19500/452?
The 1N4574A-1E3/TR itself is not pre-qualified, but it is manufactured to the same process and specifications as the MIL-PRF-19500/452-compliant variants. Adding the JANTXV prefix (e.g., JANTXV1N4574A-1) yields the fully screened military version. The "-1" suffix in the base part number indicates compliance-ready construction.
What does the "TR" suffix mean in 1N4574A-1E3/TR?
The "TR" suffix in 1N4574A-1E3/TR denotes EIA-296 standard tape-and-reel packaging, enabling automated pick-and-place assembly. It does not alter electrical or thermal specifications - the 1N4574A-1E3/TR retains identical Zener voltage, temperature coefficient, and DO-7 package dimensions as non-TR versions.
Can 1N4574A-1E3/TR operate at +175°C continuously?
Yes, the 1N4574A-1E3/TR is rated for continuous operation from –65°C to +175°C per its maximum ratings table. This rating applies to both storage and operating conditions, supported by hermetic glass sealing and internal metallurgical bonding - no derating is required at the upper limit.
What is the dynamic impedance of 1N4574A-1E3/TR and why does it matter?
The 1N4574A-1E3/TR has a dynamic impedance (ZZT) of 100 Ω measured at its 1.0 mA Zener test current. This value determines how much the output voltage shifts under varying load or ripple current - lower impedance improves regulation in feedback loops and reduces noise coupling into precision analog circuits.
1N4574A-1E3/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 6.4 V
- Tolerance:
- ±1%
- 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)
1N4574A-1E3/TR FAQ
1.How can I place an order for 1N4574A-1E3/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4574A-1E3/TR 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-1E3/TR reliable?
The price and inventory of 1N4574A-1E3/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4574A-1E3/TR is usually 5 days.
3.What payment methods are accepted for 1N4574A-1E3/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4574A-1E3/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4574A-1E3/TR?
1N4574A-1E3/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4574A-1E3/TR 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-1E3/TR?
For technical support, including 1N4574A-1E3/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4574A-1E3/TR requirements.
6.How does Aetrix verify that 1N4574A-1E3/TR is sourced from the original manufacturer or authorized distributors?
All 1N4574A-1E3/TR 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-1E3/TR meets industry standards.
7.What is the process for return or replacement of 1N4574A-1E3/TR?
All 1N4574A-1E3/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4574A-1E3/TR, 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-1E3/TR part is unused and in its original packaging.
Return procedure for 1N4574A-1E3/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4574A-1E3/TR Tags
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