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Microchip Technology 1N4578AUR-1/TR
- Part No.:
- 1N4578AUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4578AUR-1/TR.pdf
- Description:
- DIODE ZENER 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,750
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Product details
Overview
1N4578AUR-1/TR from Microsemi is a temperature-compensated Zener reference diode in DO-213AA (MELF) glass package, rated for 2.0 mA test current, ±0.001 %/°C temperature coefficient, 10 mV max voltage drift over −55°C to +100°C, and 50 Ω dynamic impedance - used in precision voltage references for aerospace-grade instrumentation and calibration circuits.
For engineers reviewing the 1N4578AUR-1/TR datasheet, 1N4578AUR-1/TR pinout, 1N4578AUR-1/TR application, or 1N4578AUR-1/TR equivalent, key selection criteria include low TC stability across military temperature range, hermetic MELF packaging for reliability, and tight Zener voltage tolerance under low-current bias conditions typical in battery-powered metrology systems.
Technical Context
This device belongs to the CDLL4565–CDLL4584A family of metallurgically bonded, double-plug Zener diodes optimized for high-stability voltage reference applications. It operates at 2.0 mA test current with guaranteed 10 mV max voltage change over −55°C to +100°C per JEDEC 5, and exhibits 50 Ω dynamic impedance at that bias point.
The 1N4578AUR-1/TR uses a compensated Zener structure achieving ±0.001 %/°C temperature coefficient - among the lowest in its class - enabled by matched junctions and hermetic glass sealing. Its axial coefficient of expansion (+6 ppm/°C) requires matching to substrate materials to minimize thermally induced stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | Specified at 2.0 mA; exact value depends on variant suffix - critical for setting reference accuracy in closed-loop regulators. |
| Temp Coefficient | ±0.001 %/°C - enables sub-mV drift over full military temperature range without external compensation. |
| Voltage Stability | ≤10 mV max change from −55°C to +100°C - meets MIL-PRF-19500/452 Class A requirements for JANTXV screening. |
| Zener Impedance | 50 Ω at 2.0 mA - ensures minimal AC ripple coupling into reference node in low-noise analog designs. |
| Package | DO-213AA (MELF, SOD-80, LL34) - hermetically sealed glass case for long-term parametric stability and moisture resistance. |
| Power Dissipation | 500 mW @ +50°C, derated 4 mW/°C above - supports operation in high-ambient industrial enclosures with minimal heatsinking. |
Pinout & Package
Package: DO-213AA (MELF), hermetically sealed glass case, lead finish Tin/Lead, axial mounting, cathode identified by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to circuit ground or lower potential; reverse-biased during Zener operation. |
| Cathode | Zener breakdown terminal | Banded end; connected to regulated positive rail - polarity must be observed to avoid destruction. |
Key Features
| Feature | Design Value |
|---|---|
| Temperature Compensation | ±0.001 %/°C TC achieved via dual-junction metallurgical bonding - eliminates need for external TC correction networks. |
| Hermetic Sealing | DO-213AA glass package prevents humidity-induced parameter shift - essential for >10-year field reliability in avionics. |
| Low Current Operation | Optimized for 2.0 mA test current - enables use in ultra-low-power reference designs where supply current is constrained. |
| MIL-Spec Screening | Available as JANTXV per MIL-PRF-19500/452 - includes burn-in, thermal cycling, and parametric verification for high-reliability programs. |
Applications
| High-Accuracy ADC Reference | Aerospace Sensor Signal Conditioning |
|---|---|
Use Scenario: Precision 24-bit sigma-delta ADC requiring stable 2.5 V reference in satellite payload telemetry system. IC Role / Device Role / Timing Role: Zener reference diode providing primary voltage基准 for ADC internal reference buffer. Use Value: ±0.001 %/°C TC and ≤10 mV total drift ensure <0.005 % FS error contribution over mission temperature profile. | Use Scenario: Strain gauge bridge amplifier in launch vehicle structural health monitoring unit. IC Role / Device Role / Timing Role: Stable excitation reference for Wheatstone bridge, rejecting common-mode thermal drift. Use Value: Hermetic MELF package and −55°C to +100°C stability eliminate recalibration cycles during thermal vacuum testing. |
| Calibration Equipment Reference | Nuclear Instrumentation Bias Supply |
Use Scenario: Portable handheld multimeter calibrator requiring traceable 10 V reference source. IC Role / Device Role / Timing Role: Primary Zener element in series-shunt reference topology with trimming resistors. Use Value: 50 Ω dynamic impedance minimizes loading error when driving op-amp input stages across temperature. | Use Scenario: High-voltage bias supply for radiation detector preamplifiers in reactor control systems. IC Role / Device Role / Timing Role: Temperature-stable reference for feedback divider in isolated DC-DC converter. Use Value: 500 mW power rating and +175°C max storage enable operation near reactor coolant piping with no derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CDLL4578A | Same electrical specs and package; identical part number prefix - differs only in tape/reel packaging (TR vs. bulk). | No functional difference; CDLL4578A is the bare die version used in hybrid assemblies, while 1N4578AUR-1/TR is surface-mount MELF. | Select 1N4578AUR-1/TR for automated SMT placement; CDLL4578A for custom hybrid integration. |
| 1N4578AUR-1 | Identical device except lacking TR (tape-and-reel) designation - same DO-213AA package, same JANTXV screening, same electrical parameters. | No application difference; 1N4578AUR-1 is supplied in ammo pack or bulk, not optimized for pick-and-place. | Choose 1N4578AUR-1/TR for high-volume SMT production; 1N4578AUR-1 for prototyping or low-volume hand assembly. |
Compared with CDLL4578A and 1N4578AUR-1, the 1N4578AUR-1/TR delivers identical Zener performance and military screening but adds tape-and-reel packaging for seamless SMT line integration - eliminating manual handling while preserving full parametric compliance.
Availability
1N4578AUR-1/TR is available at Aetrix Electronics and suitable for high-reliability aerospace instrumentation, nuclear sensor conditioning, and portable calibration equipment requiring stable component supply across extended temperature and lifecycle demands.
Supply support for 1N4578AUR-1/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 Corporation (now part of Microchip Technology) specializes in high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets.
The 1N4578AUR-1/TR belongs to Microsemi's precision Zener reference diode product line, engineered specifically for applications demanding ultra-low temperature coefficient and hermetic stability in harsh environments.
FAQ
What is the Zener test current for 1N4578AUR-1/TR?
The 1N4578AUR-1/TR is specified at a Zener test current of 2.0 mA. This bias point defines its nominal Zener voltage, temperature coefficient, and dynamic impedance values - all guaranteed per MIL-PRF-19500/452. Operating significantly above or below this current degrades TC performance and increases ZZT.
Does 1N4578AUR-1/TR have military-grade screening?
Yes, the 1N4578AUR-1/TR is available in JANTXV grade per MIL-PRF-19500/452, including extended temperature testing (−65°C to +175°C), burn-in, and parametric verification. This screening ensures suitability for flight-critical and safety-related systems where failure modes must be rigorously excluded.
What does the "TR" suffix mean in 1N4578AUR-1/TR?
The "TR" suffix indicates tape-and-reel packaging - standard for automated surface-mount assembly. The 1N4578AUR-1/TR is supplied in EIA-481-compliant carrier tape with 2,000 units per reel, enabling direct use in high-speed pick-and-place machines without repackaging.
Is 1N4578AUR-1/TR compatible with lead-free reflow processes?
No - the 1N4578AUR-1/TR features SnPb (tin/lead) lead finish and is not qualified for Pb-free reflow profiles. Its maximum peak reflow temperature is 235°C for 10 seconds. Lead-free assembly requires alternative parts such as Microchip's newer ceramic-packaged Zeners with matte tin terminations.
How does the DO-213AA package affect thermal design for 1N4578AUR-1/TR?
The DO-213AA (MELF) package has an axial coefficient of expansion of +6 ppm/°C. To prevent mechanical stress-induced parameter shift, mounting surfaces should match this COE - e.g., alumina or specific FR-4 laminates. Thermal vias or copper pour beneath pads are discouraged due to CTE mismatch risk.
1N4578AUR-1/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 50 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 3 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
1N4578AUR-1/TR FAQ
1.How can I place an order for 1N4578AUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4578AUR-1/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 1N4578AUR-1/TR reliable?
The price and inventory of 1N4578AUR-1/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4578AUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4578AUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4578AUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4578AUR-1/TR?
1N4578AUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4578AUR-1/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 1N4578AUR-1/TR?
For technical support, including 1N4578AUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4578AUR-1/TR requirements.
6.How does Aetrix verify that 1N4578AUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4578AUR-1/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 1N4578AUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4578AUR-1/TR?
All 1N4578AUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4578AUR-1/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 1N4578AUR-1/TR part is unused and in its original packaging.
Return procedure for 1N4578AUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4578AUR-1/TR Tags
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