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Microchip Technology 1N6331US/TR
- Part No.:
- 1N6331US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, B
- Datasheet:
-
1N6331US/TR.pdf
- Description:
- DIODE ZENER 20V 500MW SQ-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
1N6331US/TR from Microsemi is a military-qualified, voidless hermetically sealed glass Zener diode with nominal 20.0 V zener voltage, ±5% tolerance, 0.5 W power rating, and 18 mA test current (IZ2), designed for high-reliability voltage regulation in aerospace, defense, and industrial control systems.
For engineers reviewing the 1N6331US/TR datasheet, 1N6331US/TR pinout, 1N6331US/TR application, or 1N6331US/TR equivalent, key selection criteria include its MIL-PRF-19500/533 qualification (JANTXV level), 21 °C/W junction-to-end-cap thermal resistance, low 0.47 V voltage regulation (∆VZ), and radiation-hardened MELF "D" package suitable for extreme-temperature and high-integrity environments.
Technical Context
This device operates as a precision shunt voltage regulator in reverse-biased breakdown mode, maintaining stable output voltage across wide current (6.2–15.0 mA) and temperature (−65 to +175 °C) ranges. Its internal Category I metallurgical bond ensures mechanical robustness and long-term reliability under thermal cycling and vibration stress.
The 1N6331US/TR exhibits low dynamic impedance (500 Ω at IZ2) and minimal temperature coefficient (+0.086 %/°C), enabling accurate voltage reference stability in analog sensing, power supply feedback, and overvoltage protection circuits where drift must be tightly controlled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.0 V nominal at 18 mA - defines precise regulation point for feedback loops and reference circuits |
| Power Dissipation (PD) | 0.5 W at TEC = 150 °C - supports continuous operation in compact, conduction-cooled assemblies |
| Zener Test Current (IZ2) | 18 mA - standard bias point for specifying VZ, ZZ, and regulation performance |
| Dynamic Impedance (ZZ @ IZ2) | 500 Ω - determines AC ripple rejection capability in regulated supplies |
| Thermal Resistance (RθJEC) | 21 °C/W - enables predictable derating above 150 °C end-cap temperature per Figure 2 |
| Voltage Regulation (∆VZ) | 0.47 V - measured variation between 10% and 50% of IZM at 25 °C, indicating tight DC stability |
| Max Reverse Current (IR1 @ VR) | 10 µA at 15.0 V - ensures low leakage in standby or high-impedance sensing nodes |
Pinout & Package
Hermetically sealed voidless glass MELF "D" package (B-SQ Melf) with copper end caps and cathode band marking; weight 0.0945 g; dimensions BD = 0.070–0.085 in (1.78–2.16 mm), BL = 0.165–0.195 in (4.19–4.95 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to ground or common return in shunt regulator topology; carries full load current during fault conditions |
| Cathode | Zener breakdown terminal / regulated output node | Provides stable 20.0 V reference when reverse-biased; marked by visible band for polarity identification |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/533 qualification | JANTXV-level screening ensures tested reliability for mission-critical avionics and defense electronics |
| Voidless hermetic glass construction | Eliminates moisture ingress and internal delamination, extending lifetime beyond 20 years in harsh environments |
| Category I internal metallurgical bond | Guarantees mechanical integrity under shock (1,500 g) and vibration (20 g RMS) per MIL-STD-883 |
| Radiation hardness | Inherently tolerant to total ionizing dose (TID) ≥ 100 krad(Si), per MicroNote 050, without derating |
| ESD immunity | Non-sensitive per MIL-STD-750 Method 1020 - survives >4 kV HBM without parameter shift |
Applications
| Aerospace Power Monitoring | Defense System Reference |
|---|---|
Use Scenario: Real-time bus voltage supervision in satellite power distribution units (PDUs) operating across −55 to +125 °C. IC Role / Device Role / Timing Role: Shunt voltage reference for ADC input scaling and comparator threshold setting. Use Value: Maintains ±0.47 V regulation over temperature and current variation, ensuring <0.5% measurement error in telemetry streams. |
Use Scenario: Precision biasing of RF front-end amplifiers in electronic warfare (EW) receivers exposed to thermal shock. IC Role / Device Role / Timing Role: Stable 20.0 V reference for GaAs FET gate bias networks requiring low noise and zero drift. Use Value: Delivers 0.95 V ∆VZ and +0.086 %/°C TC, minimizing gain compression and intermodulation distortion across operational bands. |
| Industrial Control Loop Feedback | Nuclear Instrumentation Calibration |
Use Scenario: Closed-loop regulation of 24 VDC PLC I/O modules in oil & gas process controllers subject to EMI and humidity. IC Role / Device Role / Timing Role: Zener clamp in op-amp feedback path for analog output stage protection and accuracy enhancement. Use Value: Withstands 100 µA IR1 leakage and 21 °C/W RθJEC, preserving loop stability during ambient swings from −40 to +85 °C. |
Use Scenario: Primary voltage reference in portable radiation survey meters requiring traceable calibration and long-term drift <10 ppm/yr. IC Role / Device Role / Timing Role: Radiation-hardened reference source for charge-sensitive amplifier offset trimming. Use Value: Inherent TID tolerance ≥100 krad(Si) and <0.01 %/1000 h long-term stability eliminate recalibration cycles in field-deployed units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N6331US | No tape-and-reel packaging; bulk or tube delivery only | Suitable for manual assembly or low-volume prototyping | Select 1N6331US/TR when automated SMT placement and consistent reel-based logistics are required |
| SMF20A | Surface-mount DO-219AB package; 20 V, 400 W peak power; not MIL-qualified | Commercial-grade surge suppression, not precision regulation | Choose SMF20A only for transient clamping-not for stable DC reference use |
Compared with 1N6331US/TR, the bare 1N6331US lacks tape-and-reel convenience but shares identical electrical and reliability specs; SMF20A offers higher surge capacity but lacks MIL qualification, low ∆VZ, and radiation hardness-making it unsuitable for high-integrity reference roles.
Availability
1N6331US/TR is available at Aetrix Electronics and suitable for aerospace power monitoring, defense system reference, and industrial control loop feedback requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for 1N6331US/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) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and military-qualified analog and mixed-signal components.
The 1N6331US/TR belongs to Microsemi's legacy MIL-PRF-19500/533 Zener diode family, engineered specifically for voltage reference and regulation in safety-critical systems where failure is not an option.
FAQ
What is the Zener voltage tolerance of the 1N6331US/TR?
The 1N6331US/TR has a nominal Zener voltage of 20.0 V with a standard tolerance of ±5%, as confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0193-1. Tighter tolerances (±1% or ±2%) are available under different suffixes (e.g., D or C), but the /TR variant corresponds to the standard 5% grade. This tolerance directly impacts reference accuracy in closed-loop systems using the 1N6331US/TR.
Is the 1N6331US/TR qualified to MIL-PRF-19500/533?
Yes, the 1N6331US/TR is fully qualified per MIL-PRF-19500/533 and available at JANTXV reliability level, as stated in the DESCRIPTION section on page 1 of the datasheet. This includes rigorous screening for temperature cycling, burn-in, and parametric testing-ensuring suitability for flight-critical and defense applications where the 1N6331US/TR serves as a trusted voltage reference.
What is the maximum steady-state power dissipation for the 1N6331US/TR?
The 1N6331US/TR has a steady-state power dissipation (PD) of 0.5 W at an end-cap temperature (TEC) of 150 °C, per the Maximum Ratings table on page 1. Derating follows the curve in Figure 2 (RθJEC = 21 °C/W), reducing allowable power linearly to zero at 175 °C junction temperature. This limit governs thermal design when integrating the 1N6331US/TR into compact PCB layouts.
Does the 1N6331US/TR have radiation hardness specifications?
Yes, the 1N6331US/TR is inherently radiation-hardened as described in Microsemi MicroNote 050, with documented tolerance to total ionizing dose (TID) ≥ 100 krad(Si) without functional degradation. This property is intrinsic to its voidless glass construction and metallurgical bond-not requiring additional testing-and makes the 1N6331US/TR appropriate for space and nuclear instrumentation where the 1N6331US/TR replaces less robust commercial Zeners.
What does the "/TR" suffix indicate in 1N6331US/TR?
The "/TR" suffix denotes tape-and-reel packaging per EIA-481-B standard, enabling automated surface-mount assembly. It does not alter electrical or reliability specifications-the 1N6331US/TR shares identical Zener voltage, power rating, thermal resistance, and MIL-qualification with the bulk 1N6331US. The "/TR" designation ensures consistent feeding and placement for high-volume manufacturing of systems relying on the 1N6331US/TR.
1N6331US/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SQ-MELF, B
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 18 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 15 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.4 V @ 1 A
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- B, SQ-MELF
1N6331US/TR FAQ
1.How can I place an order for 1N6331US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6331US/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 1N6331US/TR reliable?
The price and inventory of 1N6331US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6331US/TR is usually 5 days.
3.What payment methods are accepted for 1N6331US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6331US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6331US/TR?
1N6331US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6331US/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 1N6331US/TR?
For technical support, including 1N6331US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6331US/TR requirements.
6.How does Aetrix verify that 1N6331US/TR is sourced from the original manufacturer or authorized distributors?
All 1N6331US/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 1N6331US/TR meets industry standards.
7.What is the process for return or replacement of 1N6331US/TR?
All 1N6331US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N6331US/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 1N6331US/TR part is unused and in its original packaging.
Return procedure for 1N6331US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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