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Microchip Technology 1N3821AUR-1/TR
- Part No.:
- 1N3821AUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N3821AUR-1/TR.pdf
- Description:
- DIODE ZENER 3.3V 1.5W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:108
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Product details
Overview
1N3821AUR-1/TR from Microsemi is a hermetically sealed, surface-mount MELF (DO-213AB) Zener diode with nominal 3.3 V zener voltage, ±5% tolerance, 76 mA test current, and 10 Ω maximum zener impedance at 1ZT. It operates from –65°C to +175°C and delivers stable voltage reference in high-reliability power regulation circuits.
For engineers reviewing the 1N3821AUR-1/TR datasheet, 1N3821AUR-1/TR pinout, 1N3821AUR-1/TR application, or 1N3821AUR-1/TR equivalent, key selection factors include its MIL-PRF-19500/115 qualification, 1 W power dissipation at 125°C, low 1 µA reverse leakage at 1 V, and compatibility with high-temperature aerospace and defense power supply designs.
Technical Context
This device is a precision silicon Zener diode optimized for voltage regulation and reference applications in harsh-environment systems. Its double-plug construction and hermetic glass package ensure long-term stability under thermal cycling and high humidity.
The 1N3821AUR-1/TR exhibits a 3.3 V nominal breakdown voltage with tight ±5% tolerance ('A' suffix), 10 Ω zener impedance at 76 mA test current, and maintains ≤1 µA reverse leakage up to 1 V - enabling accurate low-current biasing and sensing functions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.3 V ±5% - precise reference for low-voltage regulator feedback loops |
| Test Current (IZT) | 76 mA - operating point where zener voltage and impedance are specified |
| Zener Impedance (ZZT) | 10 Ω max @ 76 mA - ensures minimal output voltage variation under load changes |
| Reverse Leakage (IR) | 1 µA max @ 1 V - supports ultra-low-power standby and sensing circuits |
| Power Dissipation | 1 W @ TEC = 125°C - enables robust operation in conduction-cooled military modules |
| Operating Temp Range | –65°C to +175°C - qualified for engine bay, avionics, and downhole electronics |
| Package | DO-213AB (MELF, LL41) - surface-mount hermetic glass case with axial CTE of +6 ppm/°C |
Pinout & Package
Hermetically sealed DO-213AB (MELF) glass package with axial leads; no discrete pins - cathode identified by band; polarity requires cathode end to be biased positive relative to anode.
| Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to lower-potential node; forward VF ≤ 1.2 V @ 200 mA |
| Cathode (banded end) | Current exit terminal in forward bias; zener breakdown terminal in reverse bias | Must be held at higher potential than anode to activate 3.3 V regulation |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/115 Qualified | Meets JAN, JANTX, and JANTXV screening levels for defense-critical reliability |
| Hermetic Glass Encapsulation | Prevents moisture ingress and parameter drift over 20+ year field life |
| Double-Plug Construction | Enhances mechanical robustness and thermal cycle survivability |
| Low Thermal Resistance | 50 °C/W junction-to-end-cap (RθJC) enables direct heatsinking via end caps |
| High-Temp Stability | Stable zener voltage across –65°C to +175°C without derating below 125°C |
Applications
| Aerospace Power Conditioning | Downhole Oil & Gas Sensors |
|---|---|
Use Scenario: Regulating auxiliary 3.3 V rail in satellite DC-DC converters exposed to radiation and thermal vacuum. IC Role / Device Role / Timing Role: Precision voltage reference for error amplifier feedback network. Use Value: ±5% tolerance and <10 Ω impedance maintain loop stability under radiation-induced parameter shift. | Use Scenario: Providing stable bias voltage for MEMS pressure transducers in >150°C wellhead environments. IC Role / Device Role / Timing Role: High-temperature zener reference replacing less stable IC references. Use Value: Hermetic DO-213AB package and –65°C to +175°C rating prevent calibration drift during thermal cycling. |
| Avionics Sensor Signal Conditioning | Military Vehicle Engine Control Units |
Use Scenario: Clamping and referencing analog sensor outputs in flight control computers subject to EMI and vibration. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) zener clamp protecting ADC inputs from overvoltage. Use Value: 1 µA leakage at 1 V avoids loading high-impedance sensor bridges in precision measurement paths. | Use Scenario: Stabilizing microcontroller I/O supply rails in diesel engine ECUs operating near exhaust manifolds. IC Role / Device Role / Timing Role: Primary voltage reference for 3.3 V LDO regulators feeding safety-critical MCUs. Use Value: 1 W power rating at 125°C allows direct mounting on aluminum chassis for passive cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CDLL3821A | Same 3.3 V ±5%, DO-213AB package, but non-MIL screened; 100 µA max IR @ 1 V vs. 1 µA for 1N3821AUR-1/TR | Commercial-grade alternative; not suitable for radiation-hardened or extended-lifetime programs | Select when cost sensitivity outweighs MIL qualification and ultra-low leakage requirements |
| 1N3821AUR-1 | Identical electrical specs and package; differs only in tape-and-reel packaging (TR) vs. bulk or ammo pack | No functional difference - same die, same screening, same reliability data | Choose 1N3821AUR-1/TR for automated SMT assembly; select other variants for manual or prototyping use |
Compared with CDLL3821A and 1N3821AUR-1, the 1N3821AUR-1/TR provides guaranteed MIL-PRF-19500/115 compliance and 100× lower reverse leakage - critical for long-life, high-reliability systems where parameter drift must be minimized over decades.
Availability
1N3821AUR-1/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, downhole oil & gas sensors, and military vehicle engine control units requiring stable component supply across extended product lifecycles.
Supply support for 1N3821AUR-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 analog and mixed-signal components for defense, aerospace, and industrial markets.
The 1N3821AUR-1/TR belongs to Microsemi's legacy MIL-qualified Zener diode family, engineered specifically for voltage reference and regulation in extreme-temperature, high-reliability power systems.
FAQ
What is the zener voltage tolerance of the 1N3821AUR-1/TR?
The 1N3821AUR-1/TR has a nominal zener voltage of 3.3 V with ±5% tolerance, indicated by the 'A' suffix per Microsemi's datasheet Note 1. This tighter tolerance enables more accurate voltage regulation compared to standard ±10% variants like the base 1N3821UR-1. The 1N3821AUR-1/TR is tested and binned to meet this specification under thermal equilibrium at 25°C.
Is the 1N3821AUR-1/TR suitable for surface-mount assembly?
Yes, the 1N3821AUR-1/TR uses a DO-213AB (MELF) glass package explicitly designated as "leadless package for surface mount" in the source documentation. Its cylindrical geometry and metallized end caps support reflow soldering, and the 'TR' suffix confirms tape-and-reel packaging optimized for automated pick-and-place equipment handling the 1N3821AUR-1/TR.
Does the 1N3821AUR-1/TR meet military specifications?
Yes, the 1N3821AUR-1/TR is manufactured and screened to MIL-PRF-19500/115, supporting JAN, JANTX, and JANTXV levels. This qualification covers environmental testing, burn-in, and parametric verification required for mission-critical defense electronics - a key differentiator of the 1N3821AUR-1/TR versus commercial equivalents.
What is the maximum reverse leakage current for the 1N3821AUR-1/TR?
The 1N3821AUR-1/TR specifies a maximum reverse leakage current of 1 µA at 1 V reverse voltage (VR), per the Electrical Characteristics table. This ultra-low leakage supports high-impedance bias networks and precision analog front-ends where even nanoamp-level currents could introduce error - a verified performance value for the 1N3821AUR-1/TR, not extrapolated.
How does thermal resistance impact the 1N3821AUR-1/TR's power handling?
The 1N3821AUR-1/TR has a maximum junction-to-end-cap thermal resistance (RθJC) of 50 °C/W at L = 0 inch, allowing efficient heat transfer through its metallized end caps. This enables the 1N3821AUR-1/TR to sustain its full 1 W rating at 125°C end-cap temperature, with linear derating above that point - critical for conduction-cooled military chassis designs using the 1N3821AUR-1/TR.
1N3821AUR-1/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AB, MELF (Glass)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 100 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AB (MELF, LL41)
1N3821AUR-1/TR FAQ
1.How can I place an order for 1N3821AUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3821AUR-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 1N3821AUR-1/TR reliable?
The price and inventory of 1N3821AUR-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 1N3821AUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N3821AUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3821AUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N3821AUR-1/TR?
1N3821AUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3821AUR-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 1N3821AUR-1/TR?
For technical support, including 1N3821AUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3821AUR-1/TR requirements.
6.How does Aetrix verify that 1N3821AUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N3821AUR-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 1N3821AUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N3821AUR-1/TR?
All 1N3821AUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N3821AUR-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 1N3821AUR-1/TR part is unused and in its original packaging.
Return procedure for 1N3821AUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N3821AUR-1/TR Tags
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