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Microchip Technology 1N6311US/TR
- Part No.:
- 1N6311US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, B
- Datasheet:
-
1N6311US/TR.pdf
- Description:
- DIODE ZENER 3V 500MW SQ-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:54
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Product details
Overview
1N6311US/TR from Microsemi is a military-qualified, voidless hermetically sealed glass Zener diode with nominal Zener voltage of 3.0 V ±5%, 0.5 W power rating, and 20 mA test current (IZ2). It operates across –65 °C to +175 °C junction temperature range and delivers stable voltage regulation in high-reliability aerospace, defense, and downhole instrumentation systems.
For engineers reviewing the 1N6311US/TR datasheet, 1N6311US/TR pinout, 1N6311US/TR application, or 1N6311US/TR equivalent, key selection criteria include its MIL-PRF-19500/533 qualification (JAN/JANTXV levels), 29 Ω dynamic impedance at 20 mA, 1.5 V voltage regulation (∆VZ), and MELF "D" surface-mount package with cathode band polarity marking.
Technical Context
This device functions as a precision shunt voltage regulator in feedback loops and reference circuits. Its breakdown behavior is characterized by a sharp knee at IZK = 250 µA and a regulated Zener voltage of 3.0 V at IZ2 = 20 mA, with dynamic impedance ZZT = 29 Ω measured under 10% rms AC modulation superimposed on DC bias.
The 1N6311US/TR uses internal Category I metallurgical bonds per MIL-PRF-19500/533, enabling operation up to +175 °C junction temperature. Its voidless glass construction ensures long-term stability under thermal cycling and radiation exposure, as validated in Microsemi MicroNote 050.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.0 V ±5% at 20 mA - defines nominal regulation point for precision reference design |
| Power Dissipation (PD) | 0.5 W @ TEC = 150 °C - sets maximum continuous DC power handling before derating |
| Dynamic Impedance (ZZT) | 29 Ω at 20 mA - determines output voltage variation under load current transients |
| Regulation Voltage (∆VZ) | 1.50 V - measured voltage change between 10% and 50% of IZM at 25 °C, indicating line regulation fidelity |
| Junction Temperature Range | –65 °C to +175 °C - enables deployment in extreme environmental conditions without derating loss |
| Reverse Leakage (IR1) | 30 µA max @ 1.0 V - confirms low standby current in undervoltage protection circuits |
| Temp. Coefficient (αVZ) | –0.075 %/°C - quantifies voltage drift over temperature, critical for wide-range analog references |
Pinout & Package
Package: MELF "D" (B-SQ) surface-mount glass diode with copper end caps and cathode band marking. Hermetically sealed voidless glass construction with tungsten slugs; weight = 0.0945 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in shunt regulator configuration; accepts up to 1.4 V forward drop at 1.0 A |
| Cathode | Zener breakdown terminal | Marked with band; connected to higher-potential node; regulates voltage when reverse-biased above 3.0 V |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/533 qualification | Available in JAN, JANTX, JANTXV, and JANS reliability levels - meets stringent screening and lot acceptance testing for mission-critical systems |
| Voidless hermetic glass seal | Eliminates internal voids and moisture ingress - ensures >20-year parametric stability in sealed enclosures and high-humidity environments |
| Category I metallurgical bond | Internal bond structure qualified for 1N6321US–1N6355US series - supports full 0.5 W dissipation at +175 °C junction temperature |
| Radiation hardness | Inherently radiation-tolerant per Microsemi MicroNote 050 - suitable for space-grade and nuclear instrumentation applications |
| ESD immunity | Non-sensitive per MIL-STD-750 Method 1020 - withstands handling without external protection circuitry |
Applications
| Avionics Power Monitoring | Downhole Sensor Reference |
|---|---|
Use Scenario: Voltage reference in aircraft engine control unit (ECU) power supply monitoring circuitry operating at –55 °C to +125 °C ambient. IC Role / Device Role / Timing Role: Shunt Zener reference providing stable 3.0 V threshold for comparator-based overvoltage detection. Use Value: Maintains ±5% regulation accuracy across full temperature range and 20–200 µA load current, eliminating need for active compensation. |
Use Scenario: Precision voltage clamp in high-temperature pressure transducer signal conditioning module deployed at 175 °C downhole. IC Role / Device Role / Timing Role: Zener clamping element protecting ADC input against transient overvoltage during drilling vibration events. Use Value: Withstands 175 °C junction temperature and exhibits <30 µA leakage at 1.0 V, ensuring minimal loading on high-impedance sensor outputs. |
| Military Radio Bias Supply | Satellite Payload Regulator |
Use Scenario: Bias voltage generator for RF power amplifier stages in handheld tactical radios exposed to thermal shock and humidity. IC Role / Device Role / Timing Role: Low-noise Zener reference (1 µV/√Hz @ 250 µA) establishing stable gate bias for GaN FET drivers. Use Value: Delivers 1.5 V regulation (∆VZ) over 2:1 current swing, minimizing gain drift across battery discharge cycles. |
Use Scenario: Radiation-hardened voltage reference in star tracker electronics aboard LEO satellites requiring >15-year operational life. IC Role / Device Role / Timing Role: Primary shunt regulator supplying 3.0 V to precision op-amps and DACs in attitude determination subsystem. Use Value: Inherent radiation tolerance and –0.075 %/°C tempco enable <0.5% total error budget over mission lifetime without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N6311US | Same electrical specs and package, but supplied in bulk (not tape-and-reel); no TR suffix | Preferred for manual prototyping or low-volume hand-soldered assemblies | Select 1N6311US/TR for automated SMT placement; choose 1N6311US for bench evaluation or repair kits |
| SMZ3.0A | Commercial-grade SOD-123 package, 3.0 V ±5%, 0.5 W, but not MIL-qualified or radiation-hardened | Suitable for industrial controls or consumer electronics where cost and footprint drive selection | Use SMZ3.0A only in non-mission-critical applications lacking ESD/radiation/environmental requirements of 1N6311US/TR |
Compared with 1N6311US/TR, the 1N6311US lacks tape-and-reel packaging for SMT lines, while SMZ3.0A trades military qualification and radiation hardness for smaller footprint and lower cost-making 1N6311US/TR the sole choice for aerospace, defense, and oilfield electronics requiring guaranteed reliability.
Availability
1N6311US/TR is available at Aetrix Electronics and suitable for avionics power monitoring, downhole sensor reference, military radio bias supply, and satellite payload regulator applications requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N6311US/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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets, with emphasis on radiation-hardened, high-temperature, and MIL-spec components.
The 1N6311US/TR belongs to Microsemi's legacy MIL-PRF-19500/533-qualified Zener diode family, engineered specifically for voltage regulation in mission-critical systems where failure is not an option.
FAQ
What is the Zener voltage tolerance and test condition for 1N6311US/TR?
The 1N6311US/TR has a nominal Zener voltage of 3.0 V with ±5% tolerance, specified at a test current (IZ2) of 20 mA and ambient temperature of 25 °C. This tolerance reflects the initial calibration spread under standard DC bias conditions and does not include temperature-induced drift or long-term aging effects.
Does 1N6311US/TR meet MIL-PRF-19500/533 reliability standards?
Yes, the 1N6311US/TR is qualified per MIL-PRF-19500/533 and available in JAN, JANTX, JANTXV, and JANS reliability levels. Each level includes progressively more rigorous screening-including burn-in, temperature cycling, and lot acceptance testing-to ensure performance in high-reliability military and aerospace applications.
What is the maximum junction temperature and thermal resistance of 1N6311US/TR?
The 1N6311US/TR supports a junction temperature range of –65 °C to +175 °C. Its thermal resistance junction-to-end cap (RθJEC) is 35 °C/W for the 1N6309US–1N6320US series, enabling 0.5 W power dissipation at end-cap temperature ≤150 °C before derating applies.
How is polarity marked on the 1N6311US/TR package?
The cathode of the 1N6311US/TR is identified by a visible band on the glass body of the MELF "D" package. This band must be oriented toward the higher-potential node in shunt regulator configurations to ensure proper reverse-bias operation and Zener breakdown conduction.
Is 1N6311US/TR RoHS compliant?
The 1N6311US/TR is available in RoHS-compliant versions (designated with "e3" suffix) for commercial-grade applications only. Military-grade variants (JAN/JANTXV/JANS) retain Sn/Pb terminations to meet solderability and reliability requirements defined in MIL-PRF-19500/533.
1N6311US/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):
- 3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 29 Ohms
- Current - Reverse Leakage @ Vr:
- 30 µA @ 1 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
1N6311US/TR FAQ
1.How can I place an order for 1N6311US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6311US/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 1N6311US/TR reliable?
The price and inventory of 1N6311US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6311US/TR is usually 5 days.
3.What payment methods are accepted for 1N6311US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6311US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6311US/TR?
1N6311US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6311US/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 1N6311US/TR?
For technical support, including 1N6311US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6311US/TR requirements.
6.How does Aetrix verify that 1N6311US/TR is sourced from the original manufacturer or authorized distributors?
All 1N6311US/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 1N6311US/TR meets industry standards.
7.What is the process for return or replacement of 1N6311US/TR?
All 1N6311US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N6311US/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 1N6311US/TR part is unused and in its original packaging.
Return procedure for 1N6311US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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