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Microchip Technology 1N6347US/TR
- Part No.:
- 1N6347US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, B
- Datasheet:
-
1N6347US/TR.pdf
- Description:
- DIODE ZENER 91V 500MW SQ-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
1N6347US/TR from Microsemi is a military-qualified, hermetically sealed, voidless-glass MELF Zener diode with nominal Zener voltage 91.0 V ±5%, 0.5 W power rating, 270 mA maximum Zener current (IZM), and 4.7 Ω dynamic impedance (ZZT) at IZ2. It serves as a precision voltage reference or regulator in high-reliability power supply and protection circuits across aerospace and defense systems.
For engineers reviewing the 1N6347US/TR datasheet, 1N6347US/TR pinout, 1N6347US/TR application, or 1N6347US/TR equivalent, this part delivers stable 91 V regulation over -65 °C to +175 °C, supports MIL-PRF-19500/533 JAN/JANTXV reliability levels, and offers RoHS-compliant commercial variants - critical for radiation-hardened, ESD-insensitive, and long-lifecycle embedded designs.
Technical Context
This device operates in reverse breakdown with tightly controlled Zener voltage tolerance (±5%), low dynamic impedance (4.7 Ω), and minimal voltage regulation drift (∆VZ = 4.20 V). Its internal Category I metallurgical bond ensures mechanical robustness under thermal cycling and shock.
Thermal performance is defined by junction-to-end-cap resistance of 21 °C/W (for 1N6321US–1N6355US series), enabling reliable 0.5 W dissipation up to 150 °C end-cap temperature. Reverse leakage remains ≤10 µA at 69 V and ≤80 µA at 150 °C, supporting stable biasing in wide-temperature environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 91.0 V ±5% at 1.4 mA test current - defines precise clamping/reference point in feedback or protection paths |
| Power Dissipation (PD) | 0.5 W @ TEC = 150 °C - sets maximum continuous power handling without derating on standard PCBs |
| Dynamic Impedance (ZZT) | 4.7 Ω @ IZ2 = 270 mA - ensures minimal output voltage variation under load transients |
| Max Zener Current (IZM) | 270 mA - determines safe DC operating limit before thermal runaway risk |
| Junction Temp Range | -65 °C to +175 °C - enables deployment in extreme environmental conditions without parameter shift |
| Temp Coefficient (αVZ) | +0.108 %/°C - quantifies positive drift rate for system-level compensation planning |
| Surge Current (IZSM) | 69 A (8.3 ms square wave) - defines transient overvoltage absorption capability |
Pinout & Package
Hermetically sealed voidless glass MELF ("D") 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 | Connected to ground or lower-potential node during Zener operation; carries forward current up to 1.0 A |
| Cathode | Reverse-biased Zener terminal / high-side connection | Banded end; connected to regulated voltage rail; sustains 91 V reverse bias and absorbs surge energy |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Prevents moisture ingress and internal corrosion, ensuring >20-year shelf life and field reliability in sealed enclosures |
| Category I metallurgical bond | Eliminates interfacial delamination under thermal shock (−65 °C ↔ +175 °C), validated per MIL-STD-750 |
| MIL-PRF-19500/533 qualification | Qualified to JAN/JANTXV levels - mandatory for DoD and NASA flight-critical subsystems |
| Radiation hardness | Inherently tolerant to total ionizing dose (TID) per MicroNote 050 - suitable for LEO and GEO satellite power regulation |
| ESD immunity | Non-sensitive per MIL-STD-750 Method 1020 - survives ≥4 kV HBM without parameter shift or failure |
Applications
| Aerospace Power Regulation | Defense System Reference |
|---|---|
Use Scenario: Voltage reference in triple-redundant DC-DC converter feedback loops aboard geostationary satellites. IC Role / Device Role / Timing Role: Zener diode providing stable 91 V reference for error amplifier biasing and loop stability. Use Value: Maintains <±0.5% output accuracy over 15-year mission life despite radiation exposure and thermal vacuum cycling. |
Use Scenario: Overvoltage clamp in radar transmitter high-voltage bias supply (85–95 V range). IC Role / Device Role / Timing Role: Precision shunt regulator absorbing transient surges during RF pulse switching. Use Value: Limits voltage excursions to ≤95.5 V (91 V × 1.05) with 69 A surge capacity, protecting GaN amplifiers. |
| Industrial Control Safety Circuit | Nuclear Instrumentation Bias |
Use Scenario: Fault-detection threshold in SIL-3-rated turbine control cabinet power monitoring. IC Role / Device Role / Timing Role: Zener-based comparator input reference for 90 V undervoltage/overvoltage trip detection. Use Value: Delivers certified failure-in-time (FIT) rate <10−9/hr due to hermetic construction and MIL qualification. |
Use Scenario: High-stability bias supply for photomultiplier tube (PMT) anode chains in reactor neutron detectors. IC Role / Device Role / Timing Role: Low-noise (0.100 µV/√Hz), low-drift voltage reference setting PMT gain. Use Value: Enables <0.01% gain drift/year via +0.108 %/°C tempco compensation and radiation-hard design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N6347US | Same die, identical electrical specs, but supplied in bulk (not tape-and-reel); no TR suffix | Preferred for manual prototyping or low-volume hand-soldered assemblies | Select 1N6347US/TR when automated SMT placement and traceable reel logistics are required |
| SMF91A | Surface-mount SOD-123 package; 91 V ±5%; 1.0 W PD; higher RθJA (300 °C/W); non-hermetic polymer body | Suitable for commercial industrial controls where cost and board space outweigh radiation/longevity needs | Choose SMF91A only if MIL qualification, hermeticity, and −65 °C operation are not required |
Compared with 1N6347US/TR, the bulk 1N6347US lacks tape-and-reel packaging but matches all electrical and reliability specs, while SMF91A trades hermetic sealing and military qualification for lower cost and smaller footprint - making it viable only in non-critical, temperature-moderate applications.
Availability
1N6347US/TR is available at Aetrix Electronics and suitable for aerospace power regulation, defense system reference, and industrial control safety circuits requiring stable component supply, full traceability, and long-term obsolescence management.
Supply support for 1N6347US/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-grade analog and mixed-signal components.
The 1N63xxUS series belongs to Microsemi's legacy MIL-qualified Zener diode product line, engineered specifically for voltage reference and overvoltage protection in mission-critical aerospace, defense, and nuclear instrumentation systems.
FAQ
What is the Zener voltage tolerance for 1N6347US/TR?
The 1N6347US/TR has a nominal Zener voltage of 91.0 V with a standard tolerance of ±5%, as specified in the Electrical Characteristics table at 25 °C. Tighter tolerances (±1% or ±2%) are available under different part number suffixes (e.g., "D" or "C"), but the "TR" suffix denotes the standard 5% version in tape-and-reel packaging.
Is 1N6347US/TR qualified to MIL-PRF-19500/533?
Yes, the 1N6347US/TR is qualified per MIL-PRF-19500/533 to JANTXV reliability level, confirmed in the official Microsemi datasheet revision T4-LDS-0193-1. This includes screening for temperature cycling, burn-in, and parametric testing required for high-reliability defense and space applications.
What is the maximum surge current rating for 1N6347US/TR?
The 1N6347US/TR supports a non-repetitive peak Zener surge current (IZSM) of 69 A under an 8.3 ms square-wave waveform, as listed in the Electrical Characteristics table. This rating enables robust transient suppression in high-energy power supply fault conditions.
Does 1N6347US/TR have radiation hardness certification?
Yes, the 1N6347US/TR is inherently radiation-hardened per Microsemi MicroNote 050, with documented tolerance to total ionizing dose (TID) exceeding 100 krad(Si). This characteristic stems from its voidless hermetic glass construction and Category I metallurgical bond, not added process steps.
What is the thermal resistance junction-to-end-cap for 1N6347US/TR?
The thermal resistance junction-to-end-cap (RθJEC) for 1N6347US/TR is 21 °C/W, consistent with the 1N6321US–1N6355US series group. This value applies under DC operation and is used to calculate allowable power dissipation versus end-cap temperature per Figure 2 in the datasheet.
1N6347US/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):
- 91 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 270 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 69 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
1N6347US/TR FAQ
1.How can I place an order for 1N6347US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6347US/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 1N6347US/TR reliable?
The price and inventory of 1N6347US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6347US/TR is usually 5 days.
3.What payment methods are accepted for 1N6347US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6347US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6347US/TR?
1N6347US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6347US/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 1N6347US/TR?
For technical support, including 1N6347US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6347US/TR requirements.
6.How does Aetrix verify that 1N6347US/TR is sourced from the original manufacturer or authorized distributors?
All 1N6347US/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 1N6347US/TR meets industry standards.
7.What is the process for return or replacement of 1N6347US/TR?
All 1N6347US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N6347US/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 1N6347US/TR part is unused and in its original packaging.
Return procedure for 1N6347US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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