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Microchip Technology 1N821AUR
- Part No.:
- 1N821AUR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N821AUR.pdf
- Description:
- DIODE ZENER 6.2V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,096
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Product details
Overview
1N821AUR from Microsemi is a surface-mount, temperature-compensated Zener reference diode with nominal 6.2 V output, ±5% tolerance, 0.01%/°C temperature coefficient, 15 Ω zener impedance at 7.5 mA, and DO-213AA (MELF) glass package. It delivers stable voltage reference in precision analog circuits operating from –65°C to +175°C.
For engineers reviewing the 1N821AUR datasheet, 1N821AUR pinout, 1N821AUR application, or 1N821AUR equivalent, key selection criteria include its ultra-low TC (0.01%/°C), hermetic glass construction, RoHS-compliant e3 plating, MIL-PRF-19500/159 qualification readiness, and operation at 7.5 mA for optimal thermal stability.
Technical Context
The 1N821AUR is a zero-temperature-coefficient (Zero-TC) Zener diode engineered for minimal voltage drift across temperature extremes. Its compensation architecture achieves 0.01%/°C TC by balancing opposing TC contributions of two internal Zener junctions.
It operates at a fixed test current of 7.5 mA for specified electrical performance, with maximum reverse current of 2.0 μA at 3 V and zener impedance measured under 0.75 mA AC superimposed on DC bias - confirming low-noise, high-stability reference behavior in analog signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.9–6.5 V @ 7.5 mA - ensures stable 6.2 V nominal reference within tight production spread for calibration-critical systems |
| Temperature Coefficient (αVZ) | 0.01 %/°C - enables <±1 mV drift over –55°C to +100°C, critical for aerospace-grade instrumentation |
| Zener Impedance (ZZT) | 15 Ω @ 7.5 mA - minimizes load-induced voltage variation in high-precision DAC/ADC reference buffers |
| Reverse Current (IR) | 2.0 μA @ 3 V - guarantees negligible leakage error in low-power sensor front-ends |
| Power Dissipation | 500 mW @ TL = 25°C - supports robust thermal margin while maintaining 7.5 mA bias for optimal TC performance |
| Operating Temperature | –65°C to +175°C - qualified for downhole oil/gas, avionics, and military embedded control environments |
Pinout & Package
DO-213AA (MELF) glass package: hermetically sealed, axial-symmetric cylindrical body with cathode band marking; polarity requires banded end to be positive relative to opposite end during operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side reference terminal | Must be biased positive relative to anode to enable Zener conduction; incorrect polarity causes open-circuit failure |
| Anode (unmarked end) | Reference ground return | Serves as circuit common for precision voltage reference; low-inductance path required for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Zero-TC architecture | Compensates intrinsic Zener TC via dual-junction design to achieve 0.01%/°C - eliminates need for external thermal correction |
| Hermetic glass DO-213AA | Prevents moisture ingress and parameter shift over decades - essential for long-life space and defense systems |
| RoHS-compliant e3 plating | Matte tin termination meets IPC-J-STD-006B and solderable per MIL-STD-750 Method 2026 - supports lead-free reflow without dewetting |
| Nonsensitive to ESD | Withstands >4 kV HBM per MIL-STD-750 Method 1020 - eliminates handling precautions in automated SMT lines |
Applications
| High-Accuracy Data Acquisition | Aerospace Power Monitoring |
|---|---|
Use Scenario: Precision 24-bit ADC reference in seismic data loggers deployed at –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Primary voltage reference for SAR ADC reference buffer and DAC output calibration. Use Value: 0.01%/°C TC limits total drift to <±0.8 mV over full range - maintains ±0.0015% FS accuracy without recalibration. | Use Scenario: Bus voltage monitoring in satellite power distribution units exposed to thermal cycling from –65°C to +125°C. IC Role / Device Role / Timing Role: Stable 6.2 V reference for isolated error amplifiers in DC-DC feedback loops. Use Value: Hermetic DO-213AA package prevents parametric shift after 10,000 thermal cycles - ensures mission-critical regulation integrity. |
| Military Fire-Control Systems | Downhole Oilfield Sensors |
Use Scenario: Analog front-end reference in JANTXV-qualified radar pulse timing modules. IC Role / Device Role / Timing Role: Reference source for time-of-flight measurement comparators and threshold detectors. Use Value: MIL-PRF-19500/159 qualification readiness (with -1 suffix) enables direct integration into Class H radiation-hardened assemblies. | Use Scenario: Pressure transducer excitation reference in geothermal drill-string telemetry nodes operating at 175°C. IC Role / Device Role / Timing Role: High-temperature-stable excitation source for Wheatstone bridge sensors. Use Value: Full –65°C to +175°C operational range with <10 ppm/°C drift enables single-point calibration across entire wellbore profile. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C6V2 | 6.2 V ±5%, 40 Ω ZZT, 0.05%/°C TC, SOT-23 plastic package | Lower cost, commercial-temp only (–65°C to +150°C), no MIL qualification path | Select for cost-sensitive industrial controls where hermeticity and ultra-low TC are not required |
| 1N821UR | Same 6.2 V nominal, identical DO-213AA package, but 0.01%/°C TC and no "A" grade screening | No internal metallurgical bond option; not qualified to MIL-PRF-19500/159 even with -1 suffix | Select when full 1N821AUR performance is unnecessary and lower screening level suffices |
Compared with BZX84-C6V2 and 1N821UR, the 1N821AUR provides superior temperature stability (0.01%/°C vs. 0.05%/°C), hermetic reliability, and qualification-ready architecture - making it the only choice for extended-temperature, high-reliability reference applications demanding zero-drift performance.
Availability
1N821AUR is available at Aetrix Electronics and suitable for high-reliability instrumentation, aerospace power monitoring, and military fire-control systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N821AUR 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 defense, aerospace, and industrial markets.
The 1N821AUR belongs to Microsemi's legacy Zero-TC Zener reference diode family, designed specifically for applications demanding sub-millivolt voltage stability across extreme thermal environments and multi-decade service life.
FAQ
What is the nominal Zener voltage and tolerance of the 1N821AUR?
The 1N821AUR has a nominal Zener voltage of 6.2 V with a tolerance of ±5%, specified as 5.9–6.5 V at 7.5 mA test current. This range ensures consistent reference performance across production lots while supporting calibration-grade accuracy in precision analog systems using the 1N821AUR.
Does the 1N821AUR require a specific operating current to achieve its rated temperature coefficient?
Yes - the 1N821AUR achieves its specified 0.01%/°C temperature coefficient only when operated at the recommended test current of 7.5 mA. Deviating from this current alters the effective TC due to impedance-related voltage shifts, as documented in Microsemi's Figure 2 and Figure 3 curves. Always bias the 1N821AUR at 7.5 mA for guaranteed TC performance.
Is the 1N821AUR RoHS compliant, and what does the "e3" suffix indicate?
Yes, the 1N821AUR is RoHS compliant, indicated by the "e3" suffix in its full orderable designation (e.g., 1N821AUR-1, e3). The "e3" denotes annealed matte tin plating per J-STD-609, fully compatible with lead-free reflow processes and certified to IPC-J-STD-006B. This compliance applies only to commercial versions - military variants exclude the e3 suffix.
Can the 1N821AUR be used in place of the 1N821UR in existing designs?
The 1N821AUR is a higher-grade version of the 1N821UR, sharing identical voltage rating, package, and pinout but offering tighter temperature coefficient (0.01%/°C vs. 0.01%/°C - same spec sheet value) and qualification-readiness. While electrically interchangeable, the 1N821AUR adds internal metallurgical bond capability and MIL-PRF-19500/159 qualification path - making it a drop-in upgrade for enhanced reliability in the 1N821AUR design.
What is the maximum operating temperature range for the 1N821AUR, and how is it validated?
The 1N821AUR is rated for continuous operation from –65°C to +175°C, validated per Microsemi's mechanical and environmental test protocols including thermal cycling, hermeticity leak testing, and high-temperature life testing. This full-range specification is enabled by its DO-213AA glass package and internal metallurgical construction - confirmed in the official 1N821AUR datasheet revision B.
1N821AUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 6.2 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 3 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
1N821AUR FAQ
1.How can I place an order for 1N821AUR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N821AUR 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 1N821AUR reliable?
The price and inventory of 1N821AUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N821AUR is usually 5 days.
3.What payment methods are accepted for 1N821AUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N821AUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N821AUR?
1N821AUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N821AUR 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 1N821AUR?
For technical support, including 1N821AUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N821AUR requirements.
6.How does Aetrix verify that 1N821AUR is sourced from the original manufacturer or authorized distributors?
All 1N821AUR 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 1N821AUR meets industry standards.
7.What is the process for return or replacement of 1N821AUR?
All 1N821AUR units undergo pre-shipment inspection (PSI). If there is an issue with 1N821AUR, 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 1N821AUR part is unused and in its original packaging.
Return procedure for 1N821AUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N821AUR Tags
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