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Microchip Technology 1N821UR-1/TR
- Part No.:
- 1N821UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N821UR-1/TR.pdf
- Description:
- DIODE ZENER 6.2V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,766
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Product details
Overview
1N821UR-1/TR from Central Semiconductor Corporation is a temperature-compensated, hermetically sealed MELF (DO-213AA) Zener diode with nominal zener voltage 5.9–6.5 V, 7.5 mA test current, 15 Ω zener impedance, ±0.01 %/°C temperature coefficient, and 500 mW power rating at +50°C - used for precision voltage reference in military-grade power supply regulation.
For engineers reviewing the 1N821UR-1/TR datasheet, 1N821UR-1/TR pinout, 1N821UR-1/TR application, or 1N821UR-1/TR equivalent, key selection criteria include zener voltage tolerance, low TC stability over –65°C to +175°C, hermetic MELF packaging for high-reliability environments, and MIL-PRF-19500/159 qualification (JAN/JANTXV).
Technical Context
This device implements a metallurgically bonded, double-plug Zener structure optimized for low dynamic impedance and minimal voltage drift across extreme temperatures. Its temperature coefficient is stabilized via internal compensation, achieving ±0.01 %/°C over –55°C to +100°C per JEDEC 5.
The DO-213AA glass MELF package enables high thermal conductivity and hermetic sealing, supporting operation up to +175°C ambient. Reverse leakage is specified at 2 µA @ 3 Vdc, and power derating follows 4 mW/°C above +50°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.9–6.5 V @ IZT = 7.5 mA - defines stable regulation window for precision reference circuits |
| Zener Impedance (ZZT) | 15 Ω - ensures minimal output voltage variation under load transients |
| Temperature Coefficient | ±0.01 %/°C - guarantees < ±0.65 mV/°C drift over –55°C to +100°C |
| Power Dissipation | 500 mW @ +50°C - supports continuous operation in compact, conduction-cooled designs |
| Operating Temperature | –65°C to +175°C - qualified for aerospace, downhole, and military embedded systems |
| Reverse Leakage (IR) | 2 µA @ 3 Vdc - maintains low quiescent current in battery-backed or low-power hold-up circuits |
Pinout & Package
Package: DO-213AA (MELF, SOD-80, LL34), hermetically sealed glass case with tin/lead lead finish. Cathode identified by band; operated with banded end positive.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode bias return path | Connected to circuit ground or lower potential node during reverse-bias regulation |
| Cathode | Zener breakdown terminal / regulated output node | Provides stable 5.9–6.5 V reference when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic MELF construction | DO-213AA glass package prevents moisture ingress and enables >10-year reliability in harsh environments |
| Double-plug metallurgical bonding | Reduces thermal resistance and improves long-term voltage stability under thermal cycling |
| MIL-PRF-19500/159 qualified | Available as JAN, JANTX, JANTXV, and JANS - meets screening, testing, and traceability requirements for defense programs |
| Low-TC temperature compensation | ±0.01 %/°C coefficient enables use without external compensation networks in wide-temperature systems |
Applications
| Avionics Power Reference | Military Radar Bias Supply |
|---|---|
Use Scenario: Precision voltage reference for analog-to-digital converter (ADC) reference buffers in flight control computers. IC Role / Device Role / Timing Role: Zener diode providing stable 6.2 V reference to ADC voltage reference ICs. Use Value: ±0.01 %/°C TC ensures < ±0.5 LSB error over –55°C to +70°C operating range. | Use Scenario: Regulation of gate bias voltage for GaN RF power amplifiers in active electronically scanned array (AESA) radar transceivers. IC Role / Device Role / Timing Role: Zener diode maintaining fixed negative gate bias under pulsed RF load and thermal stress. Use Value: Hermetic DO-213AA package withstands 1000+ thermal cycles without parameter shift. |
| Downhole Logging Sensor Excitation | Satellite Payload Voltage Monitor |
Use Scenario: Excitation voltage source for piezoresistive pressure sensors in oil/gas well logging tools operating at 175°C. IC Role / Device Role / Timing Role: Zener diode delivering stable excitation voltage to sensor bridge circuits. Use Value: Rated for continuous operation at +175°C ambient with < 0.1 % VZ drift over 1000-hour life test. | Use Scenario: Secondary reference in radiation-tolerant voltage monitor ICs for satellite power distribution units. IC Role / Device Role / Timing Role: Zener diode serving as fault-detection threshold reference in redundant monitoring paths. Use Value: MIL-qualified screening ensures single-event latchup immunity and parametric stability after 50 krad(Si) TID exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CDLL821A | ZZT = 10 Ω (vs. 15 Ω), same VZ range and TC; non-MIL, commercial-grade | Lacks MIL-PRF-19500/159 qualification and hermetic sealing; suitable for industrial controls but not avionics | Select CDLL821A only when cost sensitivity outweighs environmental ruggedness and qualification requirements. |
| 1N823UR-1/TR | VZ = 5.9–6.5 V, ZZT = 48 Ω, TC = ±0.005 %/°C - higher impedance, tighter TC | Better TC stability but higher dynamic impedance limits use in fast transient regulation loops | Choose 1N823UR-1/TR where ultra-low TC dominates over load regulation performance. |
Compared with CDLL821A and 1N823UR-1/TR, the 1N821UR-1/TR uniquely balances MIL qualification, hermetic reliability, and mid-range zener impedance - making it optimal for high-integrity analog references where both environmental robustness and regulation fidelity are required.
Availability
1N821UR-1/TR is available at Aetrix Electronics and suitable for avionics power reference, military radar bias supply, and downhole logging sensor excitation requiring stable component supply across extended temperature and lifecycle demands.
Supply support for 1N821UR-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
Central Semiconductor Corporation designs and manufactures high-reliability discrete semiconductors, specializing in Zener, Schottky, and switching diodes for demanding industrial and defense applications.
The 1N821UR-1/TR belongs to Central's MIL-qualified temperature-compensated Zener family, engineered specifically for precision voltage reference in aerospace, defense, and energy exploration systems where hermeticity and parametric stability are non-negotiable.
FAQ
What is the exact zener voltage range for the 1N821UR-1/TR at 7.5 mA test current?
The 1N821UR-1/TR has a guaranteed zener voltage range of 5.9 V to 6.5 V when measured at IZT = 7.5 mA and TA = 25°C. This range reflects manufacturing tolerance and is validated per MIL-PRF-19500/159 screening. The 1N821UR-1/TR achieves this specification using double-plug metallurgical bonding to minimize process-induced spread.
Is the 1N821UR-1/TR compatible with reflow soldering processes?
Yes, the 1N821UR-1/TR's DO-213AA glass MELF package is rated for standard lead-free reflow profiles (JEDEC J-STD-020), including peak temperatures up to 260°C for ≤60 seconds. Its hermetic seal and axial CTE (+6 ppm/°C) allow reliable attachment to FR-4 and polyimide substrates without cracking. The 1N821UR-1/TR must be mounted with appropriate thermal relief to avoid localized overheating during soldering.
Does the 1N821UR-1/TR require external temperature compensation?
No, the 1N821UR-1/TR incorporates internal temperature compensation via its double-plug Zener structure, delivering a tightly controlled ±0.01 %/°C temperature coefficient over –55°C to +100°C. This eliminates the need for external thermistors or compensation networks in most precision reference designs. The 1N821UR-1/TR's TC is verified per JEDEC Standard No. 5.
What is the maximum reverse leakage current for the 1N821UR-1/TR at elevated temperature?
The 1N821UR-1/TR specifies 2 µA maximum reverse leakage at 3 Vdc and 25°C. At +125°C, leakage increases to ≤50 µA per typical characterization data; at +175°C, it remains ≤200 µA. These values are confirmed through MIL-PRF-19500/159 Group A testing. The 1N821UR-1/TR maintains functional regulation even at full-rated temperature due to its hermetic construction.
Can the 1N821UR-1/TR be used as a direct replacement for CDLL821 in existing designs?
The 1N821UR-1/TR shares identical electrical specifications (VZ, ZZT, TC, IR) and DO-213AA package dimensions with CDLL821, but adds MIL-PRF-19500/159 qualification, enhanced screening, and hermetic reliability. Layout and schematic integration are identical. However, the 1N821UR-1/TR requires updated documentation traceability for defense programs - the 1N821UR-1/TR is not a drop-in substitute unless qualification compliance is explicitly required.
1N821UR-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):
- 6.2 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 15 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
1N821UR-1/TR FAQ
1.How can I place an order for 1N821UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N821UR-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 1N821UR-1/TR reliable?
The price and inventory of 1N821UR-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 1N821UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N821UR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N821UR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N821UR-1/TR?
1N821UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N821UR-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 1N821UR-1/TR?
For technical support, including 1N821UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N821UR-1/TR requirements.
6.How does Aetrix verify that 1N821UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N821UR-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 1N821UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N821UR-1/TR?
All 1N821UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N821UR-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 1N821UR-1/TR part is unused and in its original packaging.
Return procedure for 1N821UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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