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Microchip Technology 1N4573UR-1/TR
- Part No.:
- 1N4573UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4573UR-1/TR.pdf
- Description:
- DIODE ZENER 6.4V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,556
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Product details
Overview
1N4573UR-1/TR from Microsemi is a temperature-compensated Zener reference diode in DO-213AA (MELF) glass package, rated for 1.0 mA test current, ±0.001 %/°C temperature coefficient, 5 mV max voltage stability over −55°C to +100°C, and 100 Ω dynamic impedance - used in precision voltage references for aerospace instrumentation and high-reliability analog front-ends.
For engineers reviewing the 1N4573UR-1/TR datasheet, 1N4573UR-1/TR pinout, 1N4573UR-1/TR application, or 1N4573UR-1/TR equivalent, key selection criteria include low TC, hermetic MELF packaging, MIL-PRF-19500/452 qualification, and operation in 0.5–4.0 mA range with stable Zener voltage under thermal cycling.
Technical Context
This device belongs to the CDLL4565–CDLL4584A family of metallurgically bonded, double-plug Zener diodes engineered for ultra-low temperature drift. Its compensation architecture achieves ±0.001 %/°C TC by balancing opposing TC elements within a single junction structure.
It operates exclusively in reverse-biased Zener breakdown mode with cathode-band polarity marking, requires no external biasing circuitry, and maintains voltage stability per JEDEC Std. No. 5 across its full −55°C to +100°C qualified temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | Specified at 1.0 mA test current; exact value depends on variant suffix (e.g., CDLL4573 = 6.2 V nominal), critical for absolute reference accuracy. |
| Temp Coefficient (TC) | ±0.001 %/°C - enables sub-10 ppm/°C drift in precision voltage references without external compensation. |
| Voltage Stability | ≤5 mV max change over −55°C to +100°C - ensures repeatable calibration in wide-temperature military/aerospace systems. |
| Zener Impedance (ZZT) | 100 Ω max at 1.0 mA - minimizes AC ripple coupling into reference nodes in low-noise analog signal chains. |
| Package | DO-213AA (MELF, SOD-80, LL34) - hermetically sealed glass case enabling >10-year reliability in harsh environments. |
| Qualification | MIL-PRF-19500/452 (JAN/JANTX/JANTXV/JANS) - certified for space-grade and defense-critical applications. |
Pinout & Package
DO-213AA (MELF) glass package: cylindrical, leadless, axial-symmetric body with cathode band marking; no discrete pins - terminals are axial leads formed from metallized ends of the glass-encapsulated die.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reverse-bias reference node ground connection | Connected to system ground or low-impedance return; must remain at lower potential than cathode during operation. |
| Cathode (banded end) | Zener voltage output terminal | Provides stable reference voltage; polarity marking prevents reverse installation in surface-mount layouts. |
Key Features
| Feature | Design Value |
|---|---|
| Temperature compensation | Double-plug metallurgical construction delivers ±0.001 %/°C TC - eliminates need for external thermistors or trimming in Class-S reference designs. |
| Hermetic sealing | DO-213AA glass package prevents moisture ingress and long-term parameter shift - meets MIL-STD-750 Method 1071. |
| Low operating current | Validated at 1.0 mA test current - enables battery-powered or ultra-low-power reference use without sacrificing stability. |
| Military qualification | Qualified to MIL-PRF-19500/452 - supports radiation-hardened, extended-temperature, and high-reliability program requirements. |
Applications
| Avionics Reference Supply | Satellite ADC Calibration |
|---|---|
Use Scenario: Providing stable excitation voltage for pressure transducers in flight control computers. IC Role / Device Role / Timing Role: Precision Zener reference source for ratiometric sensor signal conditioning. Use Value: ±0.001 %/°C TC ensures ≤0.1% full-scale error over −55°C to +100°C operational envelope. | Use Scenario: Biasing reference ladder in 24-bit SAR ADCs aboard LEO satellites. IC Role / Device Role / Timing Role: Primary voltage reference for analog-to-digital conversion accuracy. Use Value: 5 mV max voltage drift over temperature guarantees <1 LSB error contribution across mission lifetime. |
| Nuclear Instrumentation | Strategic Missile Guidance |
Use Scenario: Stabilizing gain-setting networks in neutron flux monitoring amplifiers. IC Role / Device Role / Timing Role: Low-drift DC reference for logarithmic amplifier feedback paths. Use Value: Hermetic DO-213AA package prevents parametric degradation under gamma irradiation and thermal shock. | Use Scenario: Generating reference thresholds for inertial measurement unit (IMU) fault detection logic. IC Role / Device Role / Timing Role: Trusted voltage threshold generator in radiation-tolerant safety interlocks. Use Value: MIL-PRF-19500/452 qualification ensures compliance with DoD 5000.62 and MIL-HDBK-217F failure rate models. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CDLL4573A | Same Zener voltage grade and TC, but qualified to −55°C to +100°C (vs. CDLL4573's 0°C to +75°C); identical DO-213AA package. | Required where full military temperature range validation is mandated (e.g., JANTXV-level programs). | Select CDLL4573A when full MIL-PRF-19500/452 temperature coverage is contractually required. |
| 1N4573AUR-1 | Same electrical specs and DO-213AA package; differs only in part numbering convention (Microsemi legacy vs. CDLL prefix). | No functional difference - used interchangeably in legacy BOMs and rework scenarios. | Choose 1N4573AUR-1 for continuity with existing schematics referencing older Microsemi nomenclature. |
Compared with CDLL4573 and 1N4573AUR-1, the 1N4573UR-1/TR shares identical Zener voltage, TC, and package but is specifically marked and tested to TR (tape-and-reel) packaging standard for automated SMT placement - making it optimal for high-volume production while maintaining full performance equivalence.
Availability
1N4573UR-1/TR is available at Aetrix Electronics and suitable for avionics reference supply, satellite ADC calibration, and nuclear instrumentation requiring stable component supply with full MIL-PRF-19500/452 traceability.
Supply support for 1N4573UR-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) designs high-reliability analog, mixed-signal, and RF semiconductors for aerospace, defense, and industrial markets.
The CDLL45xx series was developed to deliver ultra-stable Zener references for Class-S and radiation-tolerant systems where long-term voltage drift must be minimized without active compensation.
FAQ
What is the Zener voltage tolerance for 1N4573UR-1/TR?
The 1N4573UR-1/TR is part of the CDLL4573 family, which specifies a nominal Zener voltage of 6.2 V. Tolerance is not explicitly stated in the provided data sheet excerpt, but MIL-PRF-19500/452-qualified variants typically hold ±5% initial tolerance. For precise binning, consult the manufacturer's test report or lot-specific data accompanying 1N4573UR-1/TR shipments.
Is 1N4573UR-1/TR RoHS-compliant?
No - the 1N4573UR-1/TR features tin/lead lead finish and is manufactured to MIL-PRF-19500/452, which permits Pb-containing finishes for high-reliability applications. It is exempt from RoHS Directive Annex III (Category 8 - monitoring and control instruments) and does not meet Pb-free requirements per JEDEC J-STD-609.
What is the maximum power dissipation for 1N4573UR-1/TR at +125°C?
At +50°C, 1N4573UR-1/TR has a DC power dissipation rating of 500 mW. With 4 mW/°C derating above +50°C, its max dissipation at +125°C is 200 mW (500 mW − 4 mW × 75°C). This limit applies under free-air conditions with proper PCB thermal relief design.
Can 1N4573UR-1/TR be used in forward-bias applications?
No - the 1N4573UR-1/TR is designed exclusively for reverse-bias Zener operation. Forward conduction is not characterized or guaranteed; using it in forward bias risks exceeding junction temperature limits and invalidates MIL-PRF-19500/452 qualification. Always operate 1N4573UR-1/TR with cathode positive relative to anode.
Does 1N4573UR-1/TR require external heat sinking?
No - the DO-213AA package relies on PCB copper area for thermal management. At 1.0 mA operating current and typical ambient temperatures, self-heating is negligible (<1°C rise). Heat sinking is unnecessary unless ambient exceeds +125°C or power dissipation approaches 200 mW; in such cases, maximize thermal pad area and minimize trace resistance to ground plane.
1N4573UR-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):
- 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:
- Surface Mount
- Supplier Device Package:
- DO-213AA
1N4573UR-1/TR FAQ
1.How can I place an order for 1N4573UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4573UR-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 1N4573UR-1/TR reliable?
The price and inventory of 1N4573UR-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 1N4573UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4573UR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4573UR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4573UR-1/TR?
1N4573UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4573UR-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 1N4573UR-1/TR?
For technical support, including 1N4573UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4573UR-1/TR requirements.
6.How does Aetrix verify that 1N4573UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4573UR-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 1N4573UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4573UR-1/TR?
All 1N4573UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4573UR-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 1N4573UR-1/TR part is unused and in its original packaging.
Return procedure for 1N4573UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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