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Microchip Technology 1N6346US/TR
- Part No.:
- 1N6346US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, B
- Datasheet:
-
1N6346US/TR.pdf
- Description:
- DIODE ZENER 82V 500MW SQ-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
1N6346US/TR from Microsemi is a military-qualified, voidless hermetically sealed glass Zener diode in MELF (B-SQ) package, rated for 0.5 W steady-state power dissipation at 150 °C end-cap temperature, with nominal Zener voltage of 82.0 V ±5%, dynamic impedance of 1,800 Ω at 220 mA test current, and maximum surge current of 62 A (8.3 ms square wave). It serves as a precision voltage reference and regulator in high-reliability aerospace power conditioning circuits.
For engineers reviewing the 1N6346US/TR datasheet, 1N6346US/TR pinout, 1N6346US/TR application, or 1N6346US/TR equivalent, key selection criteria include its MIL-PRF-19500/533 qualification (JAN/JANTXV levels), -65 °C to +175 °C operating junction temperature range, 21 °C/W junction-to-end-cap thermal resistance, and radiation-hardened construction per MicroNote 050.
Technical Context
This device operates in reverse breakdown mode with tightly controlled Zener voltage regulation over broad current (1.5 mA to 220 mA) and temperature (-65 °C to +175 °C) ranges. Its voidless glass hermetic seal and internal Category I metallurgical bond ensure long-term stability under thermal cycling and mechanical stress.
The 1N6346US/TR exhibits a positive temperature coefficient of +0.105 %/°C for Zener voltage, low noise density (≤0.115 µV/√Hz at 250 µA, 1–3 kHz), and non-ESD-sensitive behavior per MIL-STD-750 Method 1020 - critical for mission-critical analog signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 82.0 V ±5% at 220 mA - defines stable regulation point for high-voltage reference applications |
| Power Dissipation (PD) | 0.5 W @ TEC = 150 °C - sets maximum continuous DC power handling under defined thermal boundary |
| Dynamic Impedance (ZZT) | 1,800 Ω @ IZT = 220 mA - indicates voltage regulation sensitivity to current variation |
| Junction Temperature Range | -65 °C to +175 °C - enables operation in extreme environmental conditions without derating loss |
| Thermal Resistance (RθJEC) | 21 °C/W - quantifies heat transfer efficiency from junction to end cap in MELF package |
| Surge Current (IZSM) | 62 A (8.3 ms square wave) - supports transient overvoltage clamping in protection circuits |
| Temp. Coefficient (αVZ) | +0.105 %/°C - enables predictable drift compensation in precision voltage references |
Pinout & Package
Hermetically sealed voidless glass MELF (B-SQ) package with copper end caps (Sn/Pb or RoHS matte tin finish); cathode indicated by band; 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 in Zener bias network | Connected to lower potential node; carries forward current up to 1.0 A (VF ≤ 1.4 V) |
| Cathode | Reverse breakdown terminal / regulated output node | Banded end; referenced to system ground or return path; maintains 82.0 V under specified Zener current |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/533 qualification | Available in JAN, JANTX, JANTXV, and JANS reliability levels - ensures traceable lot control and screening for defense/aerospace use |
| Voidless hermetic glass construction | Eliminates internal delamination risk under thermal shock and long-term storage - critical for >20-year system lifetimes |
| Category I internal metallurgical bond | Guarantees mechanical integrity of die-to-leadframe interface under vibration and acceleration stress |
| Radiation hardness | Inherently hardened per MicroNote 050 - suitable for low-earth orbit and nuclear instrumentation environments |
| ESD immunity | Non-sensitive per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in board-level assembly |
Applications
| Aerospace Power Bus Regulation | Satellite Payload Reference Supply |
|---|---|
Use Scenario: Stabilizing 80–90 V bus in satellite power distribution units under wide temperature swings and radiation exposure. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference and overvoltage clamp in unregulated DC-DC converter feedback loop. Use Value: Maintains ±0.5% output regulation across -55 °C to +125 °C using its +0.105 %/°C tempco and 1,800 Ω dynamic impedance. | Use Scenario: Providing ultra-stable 82 V reference for ADC biasing and sensor excitation in radiation-hardened payload electronics. IC Role / Device Role / Timing Role: Precision voltage reference element in low-noise analog front-end, leveraging 0.115 µV/√Hz noise density. Use Value: Enables <12-bit effective resolution in telemetry systems due to low drift and inherent radiation tolerance. |
| Avionics Fault Detection Circuitry | Nuclear Instrumentation Signal Conditioning |
Use Scenario: Detecting overvoltage faults on 28 V aircraft secondary buses via scaled-down monitoring with 1N6346US/TR-based divider. IC Role / Device Role / Timing Role: High-voltage Zener element in comparator threshold-setting network with guaranteed 62 A surge survival. Use Value: Survives lightning-induced transients (DO-160 Section 22) without parameter shift or failure. | Use Scenario: Biasing ionization chamber detectors in reactor monitoring systems requiring decades-long calibration stability. IC Role / Device Role / Timing Role: Primary voltage reference in high-impedance, low-leakage bias network where IR ≤ 10 µA at 150 °C. Use Value: Delivers <50 ppm/1000 hr long-term stability due to voidless glass seal and Category I bond integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N6346DUS | Same Zener voltage (82.0 V) but tighter ±1% tolerance; identical package and thermal specs | Required where absolute voltage accuracy <±0.82 V is mandated (e.g., metrology-grade references) | Select 1N6346DUS when tighter initial tolerance justifies higher cost; 1N6346US/TR remains optimal for general-purpose regulation |
| SMF82A | Surface-mount SOD-123 package; 82 V ±5%; 1 W rating; RθJA = 150 °C/W; no MIL qualification | Used in commercial industrial controls where size and cost outweigh military reliability requirements | Choose SMF82A only for non-military, space-constrained PCBs; 1N6346US/TR is mandatory for flight hardware |
Compared with 1N6346DUS and SMF82A, the 1N6346US/TR uniquely combines MIL-PRF-19500/533 qualification, voidless glass hermeticity, and Category I metallurgical bonding - making it irreplaceable in safety-critical avionics and space systems where zero-failure operation is non-negotiable.
Availability
1N6346US/TR is available at Aetrix Electronics and suitable for aerospace power regulation, satellite payload reference supplies, avionics fault detection, and nuclear instrumentation requiring stable component supply across extended lifecycle programs.
Supply support for 1N6346US/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 analog and mixed-signal components for defense, aerospace, and industrial markets.
The 1N63xxUS series was designed specifically for military and space applications demanding hermetic sealing, radiation tolerance, and MIL-PRF-19500 compliance - targeting voltage reference and regulation roles in mission-critical systems.
FAQ
What is the Zener voltage tolerance for 1N6346US/TR?
The 1N6346US/TR has a nominal Zener voltage of 82.0 V with a standard tolerance of ±5%, as confirmed in the Electrical Characteristics table on page 3 of Microsemi's T4-LDS-0193-1 datasheet. This tolerance applies at 220 mA test current and 25 °C ambient. Tighter tolerances (±1% and ±2%) are available under different suffixes (e.g., 1N6346DUS), but the /TR variant retains the standard ±5% specification.
Is 1N6346US/TR RoHS compliant?
The 1N6346US/TR is not RoHS compliant by default; RoHS-compliant versions (matte tin finish) are offered only for commercial-grade variants per the part nomenclature guide. The /TR suffix denotes tape-and-reel packaging but does not imply RoHS compliance. For RoHS requirements, specify the e3 suffix (e.g., 1N6346US e3 /TR), which is available only in commercial reliability level - not JAN/JANTXV.
What is the maximum surge current rating for 1N6346US/TR?
The 1N6346US/TR is rated for a non-repetitive peak Zener surge current (IZSM) of 62 A under an 8.3 ms square-wave pulse condition, as specified in the Electrical Characteristics table. This rating assumes proper thermal management and is validated per MIL-PRF-19500/533 test methods - enabling use in transient voltage suppression within aerospace power systems.
Does 1N6346US/TR require heatsinking in typical applications?
No active heatsink is required for the 1N6346US/TR in standard operation, as its 0.5 W power rating is managed via conduction through the end caps. With RθJEC = 21 °C/W, a 10.5 °C rise above end-cap temperature occurs at full power. PCB layout should provide adequate copper area on both end-cap pads per Microsemi's thermal derating curves (Figure 2), but no external heatsink is specified or needed for compliance with MIL-PRF-19500/533.
What reliability levels are available for 1N6346US/TR?
The 1N6346US/TR is qualified to MIL-PRF-19500/533 and available in JAN, JANTX, JANTXV, and JANS reliability levels - each with progressively stricter screening, testing, and traceability requirements. The "US" suffix denotes the MELF package; the "/TR" denotes tape-and-reel packaging. Commercial grade (no prefix) is also offered, but the /TR variant is commonly supplied in JANTXV configuration for flight-critical applications.
1N6346US/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):
- 82 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 220 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 62 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
1N6346US/TR FAQ
1.How can I place an order for 1N6346US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6346US/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 1N6346US/TR reliable?
The price and inventory of 1N6346US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6346US/TR is usually 5 days.
3.What payment methods are accepted for 1N6346US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6346US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6346US/TR?
1N6346US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6346US/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 1N6346US/TR?
For technical support, including 1N6346US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6346US/TR requirements.
6.How does Aetrix verify that 1N6346US/TR is sourced from the original manufacturer or authorized distributors?
All 1N6346US/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 1N6346US/TR meets industry standards.
7.What is the process for return or replacement of 1N6346US/TR?
All 1N6346US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N6346US/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 1N6346US/TR part is unused and in its original packaging.
Return procedure for 1N6346US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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