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Microchip Technology 1N4574A-1E3
- Part No.:
- 1N4574A-1E3
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4574A-1E3.pdf
- Description:
- DIODE ZENER 6.4V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:3,602
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Product details
Overview
1N4574A-1E3 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 test current, ±0.0005%/°C temperature coefficient, 100 Ω dynamic impedance, and operation from –65°C to +175°C. It serves as a precision voltage reference in high-stability analog instrumentation circuits.
For engineers reviewing the 1N4574A-1E3 datasheet, 1N4574A-1E3 pinout, 1N4574A-1E3 application, or 1N4574A-1E3 equivalent, key selection criteria include its ultra-low TC (0.0005%/°C), tight thermal stability over military temperature range, DO-7 hermetic packaging, and compatibility with MIL-PRF-19500/452 JANTXV qualification when ordered with appropriate prefix/suffix.
Technical Context
This device belongs to Microsemi's 1N4565–1N4584A-1 series of zero-TC Zener references, engineered using internal metallurgical bonding to minimize voltage drift. Its 6.4 V nominal Zener voltage is stabilized across temperature via compensated junction design, achieving ±0.0005%/°C TC at 1.0 mA IZT.
The 1N4574A-1E3 operates within a 0 to +75°C temperature range for specified TC performance and delivers <2.0 µA reverse leakage at 3 V. Its 100 Ω dynamic impedance is measured with 0.75 mA AC RMS superimposed on 7.5 mA DC bias at 25°C per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.4 V ±5% at 1.0 mA - stable reference point for calibration-grade analog circuits |
| Temperature Coefficient | ±0.0005%/°C - enables sub-0.1 mV/°C drift in precision voltage references |
| Zener Test Current (IZT) | 1.0 mA - optimal bias point for achieving specified TC and impedance performance |
| Dynamic Impedance (ZZT) | 100 Ω @ IZT - low AC impedance supports stable regulation under varying load conditions |
| Operating Temperature | –65°C to +175°C - suitable for aerospace, downhole, and extended-temperature industrial systems |
| Power Dissipation | 500 mW @ TL = 25°C - sufficient headroom for low-power reference designs without forced cooling |
| Reverse Leakage (IR) | ≤2.0 µA @ 3 V - ensures minimal error contribution in high-impedance reference nodes |
Pinout & Package
Hermetically sealed glass DO-7 (DO-204AA) axial-leaded package with tin-lead plated leads compliant with MIL-STD-750 Method 2026. Cathode identified by black band; device operated with banded end positive relative to unbanded end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to circuit common; establishes polarity for forward-biased biasing of auxiliary circuitry |
| Cathode (banded end) | Stable 6.4 V output node | Provides regulated reference voltage; must be biased positively relative to anode for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low temperature coefficient | ±0.0005%/°C enables <0.1 mV/°C drift over 0–75°C operating range |
| Hermetic DO-7 glass package | Ensures long-term parameter stability and moisture resistance in harsh environments |
| MIL-PRF-19500/452 qualified variants | JANTXV1N4574A-1 available for defense/aerospace applications requiring full screening |
| Nonsensitive to ESD | Complies with MIL-STD-750 Method 1020 - no special handling required during assembly |
| Flexible mounting | Axial-leaded form factor supports through-hole PCB mounting and socket-based prototyping |
Applications
| High-Accuracy Data Acquisition Systems | Avionics Power Supply Monitoring |
|---|---|
Use Scenario: Precision ADC/DAC reference in airborne telemetry units requiring traceable calibration over –55°C to +100°C. IC Role / Device Role / Timing Role: Primary voltage reference for 16-bit SAR ADC front-end, replacing less stable bandgap sources. Use Value: Enables ±0.005% full-scale accuracy retention across flight envelope due to 0.0005%/°C TC and hermetic reliability. |
Use Scenario: Reference for dual-redundant 28 VDC bus voltage comparators in flight control computers. IC Role / Device Role / Timing Role: Stable 6.4 V threshold generator for overvoltage/undervoltage detection logic. Use Value: Maintains trip-point consistency within ±1.5 mV over –65°C to +175°C ambient, meeting DO-160 Section 22 requirements. |
| Downhole Oilfield Instrumentation | Military Grade Oscillator Biasing |
Use Scenario: Voltage reference in gamma-ray spectrometer sensor modules deployed at 175°C wellbore temperatures. IC Role / Device Role / Timing Role: Biasing element for low-noise preamplifier gain stages and ADC reference ladder. Use Value: Delivers <±2 mV total drift over full temperature range, eliminating recalibration between runs. |
Use Scenario: Bias reference for oven-controlled crystal oscillator (OCXO) temperature compensation networks. IC Role / Device Role / Timing Role: Low-drift reference for DAC-controlled thermistor bridge nulling circuitry. Use Value: Reduces OCXO aging-induced frequency drift by 30% compared to standard 6.2 V Zeners due to matched TC behavior. |
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 (non-E3) | Same electrical specs; differs only in lead finish - matte tin vs. tin-lead (E3) | Non-RoHS-compliant legacy variant; unsuitable for new EU/medical designs | Select 1N4574A-1E3 for RoHS compliance and solderability assurance per MIL-STD-750 |
| LM399H | 2 ppm/°C TC, 6.95 V output, internal heater; requires 10 mA bias and thermal management | Higher accuracy but larger footprint, higher power, and complex thermal design | Choose LM399H only when sub-10 ppm total error is mandatory; otherwise 1N4574A-1E3 offers simpler, lower-cost solution |
Compared with 1N4574A-1E3, the non-E3 variant lacks RoHS compliance and may require requalification for modern production, while the LM399H delivers superior TC but demands board-level thermal isolation and 3× higher power - making 1N4574A-1E3 optimal for space-constrained, low-power, high-reliability reference nodes.
Availability
1N4574A-1E3 is available at Aetrix Electronics and suitable for high-reliability instrumentation, avionics monitoring, and downhole sensing applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N4574A-1E3 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, RF, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N4574A-1E3 belongs to Microsemi's Scottsdale Division precision reference diode family, designed specifically for applications demanding ultra-stable voltage references under extreme thermal and environmental stress.
FAQ
What is the Zener voltage tolerance for 1N4574A-1E3?
The 1N4574A-1E3 has a nominal Zener voltage of 6.4 V with a tolerance of ±5% at 1.0 mA test current, as specified in the Electrical Characteristics table. Tighter tolerances (e.g., ±1%, ±2%) are available via custom ordering suffixes like "-1%" but are not standard for the base 1N4574A-1E3 part number.
Is 1N4574A-1E3 RoHS compliant?
Yes, the "E3" suffix indicates matte tin lead finish compliant with RoHS Directive 2011/65/EU. This distinguishes it from legacy tin-lead versions (e.g., 1N4574A-1) and ensures compatibility with modern lead-free assembly processes per IPC-J-STD-020.
Can 1N4574A-1E3 be used in military applications?
Yes - the base 1N4574A-1E3 meets commercial specifications, but JANTXV1N4574A-1E3 (with JANTXV prefix and -1 suffix) is fully qualified to MIL-PRF-19500/452, including screening for vibration, thermal shock, and burn-in. That variant is approved for use in Class H and Class K military systems.
What is the maximum power dissipation for 1N4574A-1E3?
The 1N4574A-1E3 has a maximum DC power dissipation of 500 mW at lead temperature (TL) = 25°C. However, for optimal voltage-temperature stability, Microsemi recommends operating below 30 mW - achieved by limiting Zener current to ≤1.0 mA at 6.4 V, consistent with its specified test condition.
Does 1N4574A-1E3 require derating above 25°C?
Yes - the 500 mW rating applies only at TL = 25°C. Derating is linear at 4.0 mW/°C above 25°C, reaching 0 mW at TL = 150°C. For reliable operation at +175°C ambient, PCB layout must ensure low thermal resistance to maintain TL ≤ 125°C, as confirmed in Microsemi's DO-7 thermal characterization data.
1N4574A-1E3 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:
- ±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 FAQ
1.How can I place an order for 1N4574A-1E3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4574A-1E3 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 reliable?
The price and inventory of 1N4574A-1E3 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 is usually 5 days.
3.What payment methods are accepted for 1N4574A-1E3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4574A-1E3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4574A-1E3?
1N4574A-1E3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4574A-1E3 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?
For technical support, including 1N4574A-1E3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4574A-1E3 requirements.
6.How does Aetrix verify that 1N4574A-1E3 is sourced from the original manufacturer or authorized distributors?
All 1N4574A-1E3 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 meets industry standards.
7.What is the process for return or replacement of 1N4574A-1E3?
All 1N4574A-1E3 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4574A-1E3, 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 part is unused and in its original packaging.
Return procedure for 1N4574A-1E3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4574A-1E3 Tags
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Diodes Incorporated
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