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Microchip Technology 1N4581AUR-1/TR
- Part No.:
- 1N4581AUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4581AUR-1/TR.pdf
- Description:
- DIODE ZENER 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:108
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Product details
Overview
1N4581AUR-1/TR from Microsemi is a temperature-compensated Zener reference diode in a hermetically sealed DO-213AA (MELF) glass package, rated for 4.0 mA test current, ±0.005 %/°C temperature coefficient, and 24 mV voltage stability over –55°C to +100°C. It serves as a precision voltage reference in aerospace-grade power supply feedback loops and analog sensor signal conditioning circuits.
For engineers reviewing the 1N4581AUR-1/TR datasheet, 1N4581AUR-1/TR pinout, 1N4581AUR-1/TR application, or 1N4581AUR-1/TR equivalent, this part delivers low-drift, high-stability reference performance in surface-mount, radiation-tolerant, and extended-temperature designs requiring MIL-PRF-19500/452 compliance.
Technical Context
This device uses metallurgically bonded, double-plug construction to minimize thermal hysteresis and achieve tight voltage stability across wide temperature excursions. Its Zener impedance is 25 Ω at 4.0 mA, and it maintains ≤50 mV total voltage deviation over –55°C to +100°C per JEDEC 5.
The diode operates with cathode-positive polarity and exhibits axial CTE of +6 ppm/°C, requiring matched mounting surface expansion for long-term calibration integrity in precision instrumentation and avionics systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | Specified at 4.0 mA test current; enables stable reference generation in low-power analog circuits. |
| Temp. Coefficient | ±0.005 %/°C; ensures minimal drift in high-accuracy voltage references across military temperature range. |
| Voltage Stability | ≤24 mV max deviation over –55°C to +100°C; supports repeatable calibration in harsh environments. |
| Zener Impedance | 25 Ω at 4.0 mA; provides low AC impedance for noise rejection in feedback networks. |
| Package | DO-213AA (MELF, SOD-80); hermetic glass seal ensures reliability in vacuum, space, and high-humidity applications. |
| Power Dissipation | 500 mW @ +50°C, derated 4 mW/°C above; defines safe operating area for continuous DC biasing. |
Pinout & Package
DO-213AA (MELF) glass package: cylindrical, leadless, hermetically sealed, axial symmetry. Cathode identified by single black band. No discrete pins - terminals are axial leads formed from metallized ends of the glass body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink terminal during reverse breakdown | Connected to circuit ground or lower-potential node in shunt reference configuration. |
| Cathode | Current source terminal during reverse breakdown | Banded end; connected to regulated output node; polarity must be observed to avoid forward conduction. |
Key Features
| Feature | Design Value |
|---|---|
| Temperature compensation | Double-plug Zener structure achieves ±0.005 %/°C TC, enabling <24 mV drift over full military range. |
| Hermetic sealing | DO-213AA glass package prevents moisture ingress and parametric shift in long-life, high-reliability deployments. |
| MIL-PRF-19500/452 qualified | Qualified to JANTXV level; includes screening for vibration, thermal shock, and burn-in per military specification. |
| Low dynamic impedance | 25 Ω Zzt at 4.0 mA improves regulation against load transients in closed-loop feedback systems. |
Applications
| Avionics Power Monitoring | Satellite Sensor Calibration |
|---|---|
Use Scenario: Real-time monitoring of 28 VDC bus voltage in flight control computers using resistive divider + op-amp comparator. IC Role / Device Role / Timing Role: Precision shunt reference providing stable threshold for overvoltage detection. Use Value: ±0.005 %/°C TC ensures <24 mV error across –55°C to +100°C, eliminating recalibration during thermal cycling. | Use Scenario: Biasing and scaling analog outputs from radiation-hardened temperature and pressure sensors on LEO platforms. IC Role / Device Role / Timing Role: Primary voltage reference for ADC front-end gain-setting and offset trimming. Use Value: Hermetic DO-213AA package prevents parameter drift in vacuum and atomic oxygen environments. |
| Downhole Oilfield Instrumentation | Nuclear Reactor Control Systems |
Use Scenario: Providing stable reference for pressure transducer signal conditioning in 175°C wellbore tools. IC Role / Device Role / Timing Role: High-temperature Zener reference in isolated analog front-end with passive filtering. Use Value: Rated for –65°C to +175°C operation and 500 mW dissipation enables direct use without derating at 150°C ambient. | Use Scenario: Critical voltage reference in safety-critical reactor coolant level monitoring circuitry. IC Role / Device Role / Timing Role: MIL-qualified shunt reference ensuring fail-safe trip thresholds under neutron flux exposure. Use Value: JANTXV qualification and metallurgical double-plug construction provide proven radiation tolerance and long-term stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CDLL4581A | Same electrical specs and DO-213AA package; identical Zener voltage, TC, and ZZT; differs only in part numbering convention (Microsemi internal vs. JAN/JANTXV). | No functional difference; CDLL4581A is the non-military-specified commercial variant of same die and assembly. | Select CDLL4581A for non-military programs where MIL-PRF-19500/452 compliance is not required. |
| 1N4581AUR-1 | Identical specifications and packaging; TR suffix denotes tape-and-reel packaging, while bare part number implies bulk or ammo pack - no electrical or mechanical difference. | Same use cases; TR version optimized for automated SMT placement. | Choose 1N4581AUR-1/TR when feeding pick-and-place machines; otherwise, 1N4581AUR-1 is functionally interchangeable. |
Compared with CDLL4581A and 1N4581AUR-1, the 1N4581AUR-1/TR offers identical reference performance and hermetic reliability but is specifically packaged for high-volume automated assembly, making it optimal for production lines requiring tape-and-reel delivery without sacrificing MIL-qualified stability.
Availability
1N4581AUR-1/TR is available at Aetrix Electronics and suitable for avionics power monitoring, satellite sensor calibration, and downhole oilfield instrumentation requiring stable component supply under extended temperature and radiation-exposed conditions.
Supply support for 1N4581AUR-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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and aerospace-grade components.
The 1N4581AUR-1/TR belongs to Microsemi's CDLL45xx family of temperature-compensated Zener references, designed explicitly for precision voltage regulation in mission-critical systems operating across –65°C to +175°C.
FAQ
What is the Zener test current for the 1N4581AUR-1/TR?
The 1N4581AUR-1/TR is specified at a Zener test current (IZT) of 4.0 mA. This current establishes the nominal Zener voltage and is used to measure key parameters including Zener impedance (25 Ω), temperature coefficient (±0.005 %/°C), and voltage stability (≤24 mV). Operating significantly below or above this value increases drift and impedance.
Is the 1N4581AUR-1/TR compatible with lead-free soldering processes?
The 1N4581AUR-1/TR features tin/lead lead finish and is not qualified for Pb-free reflow profiles. Its maximum junction temperature rating remains +175°C, but peak reflow temperatures exceeding 220°C may compromise hermeticity or metallurgical bonds. For RoHS-compliant designs, consult Microchip's qualified lead-free alternatives in the same family.
Does the 1N4581AUR-1/TR require heatsinking in typical applications?
No. The 1N4581AUR-1/TR dissipates ≤20 mW at its 4.0 mA operating point (assuming ~5 V Zener voltage), well within its 500 mW rating at +50°C. Its DO-213AA glass package relies on axial conduction, not PCB copper; heatsinking is unnecessary unless operating near maximum ambient or at elevated power levels beyond spec.
How does the 1N4581AUR-1/TR achieve its low temperature coefficient?
The 1N4581AUR-1/TR achieves ±0.005 %/°C TC via metallurgically bonded, double-plug Zener construction - two complementary Zener junctions with opposing temperature coefficients are integrated into a single die and trimmed to cancel drift. This architecture is validated across –55°C to +100°C per JEDEC 5.
Can the 1N4581AUR-1/TR be used in series or parallel configurations?
The 1N4581AUR-1/TR is intended for shunt (parallel) reference use only. Series connection is not recommended due to mismatched leakage and thermal coupling effects that degrade stability. Parallel use is acceptable only with matched units and current-sharing resistors; however, its low ZZT (25 Ω) makes single-device use preferred for best accuracy.
1N4581AUR-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):
- 25 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
1N4581AUR-1/TR FAQ
1.How can I place an order for 1N4581AUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4581AUR-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 1N4581AUR-1/TR reliable?
The price and inventory of 1N4581AUR-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 1N4581AUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4581AUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4581AUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4581AUR-1/TR?
1N4581AUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4581AUR-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 1N4581AUR-1/TR?
For technical support, including 1N4581AUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4581AUR-1/TR requirements.
6.How does Aetrix verify that 1N4581AUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4581AUR-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 1N4581AUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4581AUR-1/TR?
All 1N4581AUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4581AUR-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 1N4581AUR-1/TR part is unused and in its original packaging.
Return procedure for 1N4581AUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4581AUR-1/TR Tags
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