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Microchip Technology 1N6312US/TR
- Part No.:
- 1N6312US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, B
- Datasheet:
-
1N6312US/TR.pdf
- Description:
- DIODE ZENER 3.3V 500MW SQ-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:136
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Product details
Overview
1N6312US/TR from Microsemi is a military-qualified, hermetically sealed 3.3 V, ±5% tolerance Zener diode in MELF (B-SQ) package, rated for 0.5 W steady-state power dissipation at 150 °C end-cap temperature, with 27 Ω dynamic impedance at 20 mA test current and 128 mA maximum Zener current - used for precision voltage reference and regulation in high-reliability aerospace power conditioning circuits.
For engineers reviewing the 1N6312US/TR datasheet, 1N6312US/TR pinout, 1N6312US/TR application, or 1N6312US/TR equivalent, this page delivers verified electrical characteristics, MIL-PRF-19500/533 qualification status, thermal derating curves, RoHS-compliant availability, and direct alternatives with documented voltage tolerance and power handling differences.
Technical Context
This device operates as a reverse-biased voltage regulator with a nominal Zener voltage of 3.3 V at 20 mA, exhibiting 1.60 V voltage regulation (∆VZ) between 10% and 50% of IZM, and a negative temperature coefficient of −0.070 %/°C - enabling stable reference generation across −65 °C to +175 °C junction temperature range.
Its voidless glass construction features internal Category I metallurgical bonds (per MIL-PRF-19500/533), non-ESD-sensitive design (MIL-STD-750 Method 1020), and inherent radiation hardness per MicroNote 050 - making it suitable for space-grade analog biasing and fault-tolerant voltage clamping where failure is unacceptable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.3 V ±5% at 20 mA - defines primary regulation point with tight production control for mission-critical references. |
| Power Dissipation (PD) | 0.5 W @ TEC = 150 °C - sets maximum continuous DC power under defined thermal mounting conditions. |
| Dynamic Impedance (ZZT) | 27 Ω @ 20 mA - determines output voltage stability under varying load current within regulation band. |
| Max Zener Current (IZM) | 128 mA - establishes absolute upper limit for safe DC conduction without thermal runaway. |
| Junction Temp Range (TJ) | −65 °C to +175 °C - enables operation in extreme environments including satellite payload electronics and downhole instrumentation. |
| Temp Coefficient (αVZ) | −0.070 %/°C - quantifies voltage drift with temperature, critical for low-drift reference design. |
| Forward Voltage (VF) | 1.4 V @ 1.0 A - specifies forward conduction behavior for bidirectional protection or clamp applications. |
Pinout & Package
Hermetically sealed B-SQ MELF package (glass body with tungsten slugs and copper end caps); cathode indicated by band; RoHS-compliant matte tin finish available for commercial grade only; 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 connection | Connected to circuit ground or lower potential node during Zener operation; carries full reverse current when regulating. |
| Cathode | Zener breakdown terminal / high-side connection | Marked by band; connected to regulated voltage rail; sustains reverse bias and dissipates power during regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Prevents moisture ingress and long-term parameter drift - essential for >20-year system reliability in sealed enclosures. |
| Category I internal metallurgical bond | Ensures mechanical integrity under shock/vibration per MIL-PRF-19500/533 - validated for JANTXV and JANS levels. |
| MIL-PRF-19500/533 qualification | Qualified to JAN, JANTX, JANTXV, and JANS reliability levels - required for DoD and NASA flight hardware procurement. |
| Non-ESD-sensitive construction | Withstands MIL-STD-750 Method 1020 testing - eliminates need for ESD handling protocols during assembly. |
| Inherent radiation hardness | Validated per MicroNote 050 - supports operation in total ionizing dose (TID) environments up to 100 krad(Si). |
Applications
| Aerospace Power Conditioning | Satellite Onboard Reference |
|---|---|
Use Scenario: Regulating auxiliary supply rails in attitude control electronics subjected to thermal cycling from −40 °C to +85 °C ambient. IC Role / Device Role / Timing Role: Precision voltage reference for ADC biasing and op-amp feedback networks. Use Value: Maintains ≤1.60 V regulation error over 10–50% IZM, ensuring consistent analog measurement accuracy despite load transients. |
Use Scenario: Providing stable 3.3 V reference for telemetry sensor signal conditioning in LEO satellite payloads. IC Role / Device Role / Timing Role: Radiation-hardened Zener reference replacing less robust commercial diodes in analog front-ends. Use Value: Delivers −0.070 %/°C tempco and TJ operation to +175 °C - enabling calibration retention after orbital thermal soak cycles. |
| Downhole Instrumentation | Military Avionics Biasing |
Use Scenario: Voltage clamping in high-temperature logging tools operating at 150 °C downhole ambient. IC Role / Device Role / Timing Role: Overvoltage protection element in analog sensor interface circuits exposed to EMI-induced transients. Use Value: Sustains 0.5 W dissipation at TEC = 150 °C with RθJEC = 35 °C/W - prevents thermal runaway in confined oil-well probe housings. |
Use Scenario: Generating stable bias points for RF amplifier stages in radar warning receivers requiring MIL-STD-810G compliance. IC Role / Device Role / Timing Role: Low-noise voltage reference for local oscillator PLLs and mixer LO injection paths. Use Value: Delivers <1 µV/√Hz noise density at 250 µA - minimizing phase noise contribution in sensitive RF subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N6312US | Same Zener voltage (3.3 V), identical package and qualification level, but supplied in bulk rather than tape-and-reel. | No functional difference; differs only in packaging format - unsuitable for automated SMT placement without reel conversion. | Select 1N6312US/TR when using pick-and-place equipment requiring EIA-481-B compliant tape-and-reel delivery. |
| 1N6312DUS | Identical 3.3 V rating but ±1% tolerance (vs. ±5% for 1N6312US/TR) and tighter 0.40 V regulation (∆VZ). | Higher precision reference for metrology-grade instruments; requires tighter layout control due to increased sensitivity to thermal gradients. | Choose 1N6312DUS where absolute voltage accuracy dominates cost and qualification requirements. |
Compared with 1N6312US/TR, 1N6312US offers identical electrical performance but lacks tape-and-reel convenience, while 1N6312DUS trades broader tolerance for higher precision - making the TR variant optimal for high-volume, automated production of ruggedized systems where ±5% is sufficient.
Availability
1N6312US/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, satellite onboard reference, and downhole instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N6312US/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 1N63xxUS series belongs to Microsemi's legacy MIL-PRF-19500/533-qualified Zener diode family, engineered specifically for fail-safe voltage regulation in defense, space, and energy exploration systems where parameter stability under stress is non-negotiable.
FAQ
What is the Zener voltage tolerance for 1N6312US/TR?
The 1N6312US/TR has a nominal Zener voltage of 3.3 V with a standard tolerance of ±5%, as confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0193-1 Rev. 1. Tighter tolerances (±1% and ±2%) are available under different suffixes (e.g., 1N6312DUS), but the /TR variant retains the base 5% specification.
Is 1N6312US/TR qualified to MIL-PRF-19500/533?
Yes, the 1N6312US/TR is explicitly qualified per MIL-PRF-19500/533 to JAN, JANTX, JANTXV, and JANS reliability levels, as stated in the DESCRIPTION section on page 1 of the datasheet. Its voidless glass construction and Category I metallurgical bond meet the standard's mechanical and environmental requirements.
What is the maximum Zener current (IZM) for 1N6312US/TR?
The maximum Zener current for 1N6312US/TR is 128 mA, specified at 25 °C ambient and derived from its 0.5 W power rating and 3.3 V nominal Zener voltage. This value is listed in the Electrical Characteristics table on page 3 and governs safe continuous DC operation.
Does 1N6312US/TR have RoHS-compliant versions?
Yes, RoHS-compliant versions of 1N6312US/TR are available for commercial-grade use only, featuring matte tin end-cap finish instead of Sn/Pb. The datasheet notes that RoHS compliance is indicated by the "e3" suffix (e.g., 1N6312US e3), and such variants are not offered at JAN/JANTXV/JANS levels.
What is the thermal resistance junction-to-end cap (RθJEC) for 1N6312US/TR?
The thermal resistance junction-to-end cap for 1N6312US/TR is 35 °C/W, as specified in the Maximum Ratings table on page 1. This value applies to the 1N6309US–1N6320US group, which includes 1N6312US/TR, and is used to calculate allowable power derating above 150 °C end-cap temperature.
1N6312US/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):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 27 Ohms
- Current - Reverse Leakage @ Vr:
- 5 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
1N6312US/TR FAQ
1.How can I place an order for 1N6312US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6312US/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 1N6312US/TR reliable?
The price and inventory of 1N6312US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6312US/TR is usually 5 days.
3.What payment methods are accepted for 1N6312US/TR?
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4.How is shipping managed for 1N6312US/TR?
1N6312US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6312US/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 1N6312US/TR?
For technical support, including 1N6312US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6312US/TR requirements.
6.How does Aetrix verify that 1N6312US/TR is sourced from the original manufacturer or authorized distributors?
All 1N6312US/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 1N6312US/TR meets industry standards.
7.What is the process for return or replacement of 1N6312US/TR?
All 1N6312US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N6312US/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 1N6312US/TR part is unused and in its original packaging.
Return procedure for 1N6312US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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