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Microchip Technology 1N6348US/TR
- Part No.:
- 1N6348US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, B
- Datasheet:
-
1N6348US/TR.pdf
- Description:
- DIODE ZENER 100V 500MW SQ-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
1N6348US/TR from Microsemi is a military-qualified, voidless hermetically sealed glass Zener diode with nominal 100 V Zener voltage (±5%), 0.5 W power rating, and 340 mA maximum Zener current at 25 °C. It operates across –65 to +175 °C junction temperature range and delivers stable voltage regulation in high-reliability aerospace, defense, and industrial power supply monitoring circuits.
For engineers reviewing the 1N6348US/TR datasheet, 1N6348US/TR pinout, 1N6348US/TR application, or 1N6348US/TR equivalent, this part supports precision reference design, overvoltage protection, and voltage clamping where MIL-PRF-19500/533 qualification, radiation hardness, and ESD immunity per MIL-STD-750 Method 1020 are required.
Technical Context
This Zener diode uses a voidless hard-glass package with internal metallurgical bond (Category I), enabling robust thermal performance and long-term stability under extreme environmental stress. Its dynamic impedance of 2,400 Ω at 340 mA ensures predictable regulation behavior near knee current, while low noise density (0.095 µV/√Hz) supports sensitive analog reference applications.
The device exhibits a positive temperature coefficient of +0.110 %/°C for Zener voltage, indicating predictable drift with temperature rise - critical for compensated reference designs. Thermal resistance junction-to-end cap is 21 °C/W (1N6321US–1N6355US group), supporting reliable derating up to 150 °C end-cap temperature per Figure 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 100.0 V ±5% at 340 mA - defines precise clamping threshold for overvoltage protection circuits |
| Power Dissipation (PD) | 0.5 W @ TEC = 150 °C - sets maximum continuous DC power handling under defined thermal mounting |
| Junction Temperature Range | –65 to +175 °C - enables operation in extended-environment avionics and downhole electronics |
| Dynamic Impedance (ZZT) | 2,400 Ω @ 340 mA - determines output voltage variation under load current changes |
| Temp. Coefficient (αVZ) | +0.110 %/°C - quantifies predictable Zener voltage increase per degree Celsius rise |
| Max. Reverse Current (IR) | 10 µA @ 76 V - specifies leakage level below breakdown, critical for low-power standby circuits |
| Noise Density | 0.095 µV/√Hz @ 250 µA, 1–3 kHz - supports low-noise voltage reference use in precision instrumentation |
Pinout & Package
Hermetically sealed B-SQ 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 in shunt regulator configuration |
| Cathode | Zener breakdown terminal / high-side connection | Banded end; connected to input rail to clamp voltage above 100 V during transients |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/533 qualification | Available in JAN, JANTX, JANTXV, and JANS reliability levels - meets stringent screening and testing for mission-critical systems |
| Voidless hermetic glass construction | Eliminates internal delamination risk under thermal cycling and humidity exposure - ensures 20+ year field reliability |
| Category I internal metallurgical bond | Enables 175 °C max junction temperature and superior mechanical integrity vs. epoxy-packaged alternatives |
| ESD immunity per MIL-STD-750 Method 1020 | Withstands human-body-model ESD events without parameter shift - simplifies handling in cleanroom assembly |
| Inherent radiation hardness | Validated per Microsemi MicroNote 050 - suitable for low-dose space and nuclear instrumentation environments |
Applications
| Aerospace Power Monitoring | Defense System Reference |
|---|---|
Use Scenario: Real-time bus voltage supervision in satellite power distribution units. IC Role / Device Role / Timing Role: Shunt Zener reference providing fault-trigger threshold at 100 V ±5%. Use Value: Enables immediate overvoltage shutdown before downstream FETs exceed SOA limits, leveraging 175 °C operational margin. |
Use Scenario: Precision voltage reference in missile guidance inertial measurement unit (IMU) analog front-end. IC Role / Device Role / Timing Role: Stable 100 V reference for ADC biasing and sensor excitation circuitry. Use Value: Low 0.095 µV/√Hz noise and +0.110 %/°C tempco allow sub-0.1% total error over –55 to +125 °C operating range. |
| Industrial High-Voltage Clamping | Nuclear Instrumentation Supply |
Use Scenario: Transient voltage suppression on 80–110 V DC control rails in railway signaling cabinets. IC Role / Device Role / Timing Role: Passive clamping element absorbing surge energy via Zener breakdown. Use Value: 340 mA IZM and 2.4 kΩ ZZT ensure repeatable clamping at 100 V without thermal runaway under 8.3 ms surges. |
Use Scenario: Bias supply regulation for radiation-hardened photomultiplier tube (PMT) arrays in reactor monitoring detectors. IC Role / Device Role / Timing Role: Primary voltage reference in high-stability HV bias chain. Use Value: Inherent radiation hardness and –65 to +175 °C operation eliminate need for shielding or derating in neutron-rich environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N6348US | Same electrical specs and package; differs only in packaging format (bulk vs. tape-and-reel) | No functional difference; identical reliability level and test screening | Select 1N6348US/TR for automated SMT placement; choose 1N6348US for manual prototyping or low-volume hand-soldering |
| SMF100A | Surface-mount SOD-123 package; 100 V, 1 W, ±5%; higher power but non-hermetic, commercial-grade only | Lacks MIL-PRF-19500 qualification, radiation hardness, and ESD immunity per MIL-STD-750 | Use SMF100A only in cost-sensitive commercial applications where military reliability and radiation tolerance are not required |
Compared with 1N6348US/TR, the 1N6348US offers identical performance in bulk form but no reel support, while SMF100A trades hermeticity and qualification for higher power and lower cost - making it unsuitable for aerospace or defense deployments requiring proven reliability.
Availability
1N6348US/TR is available at Aetrix Electronics and suitable for aerospace power monitoring, defense system reference, and industrial high-voltage clamping requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N6348US/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 components.
The 1N63xxUS series belongs to Microsemi's legacy MIL-PRF-19500/533-qualified Zener diode product line, engineered for voltage regulation in mission-critical systems where failure is not an option.
FAQ
What is the Zener voltage tolerance and test current for 1N6348US/TR?
The 1N6348US/TR has a nominal Zener voltage of 100.0 V with ±5% tolerance, measured at a test current (IZ2) of 340 mA. This tolerance is standard per JEDEC nomenclature; tighter 1% or 2% versions exist under different suffixes (e.g., D or C), but 1N6348US/TR specifically uses the 5% variant.
Is 1N6348US/TR qualified to MIL-PRF-19500/533, and what reliability levels are offered?
Yes, 1N6348US/TR is qualified per MIL-PRF-19500/533 and available in JAN, JANTX, JANTXV, and JANS reliability levels. Each level corresponds to progressively stricter screening, burn-in, and lot acceptance testing - with JANS meeting full space-level requirements including radiation testing.
What is the thermal resistance and derating behavior of 1N6348US/TR?
The 1N6348US/TR has a junction-to-end-cap thermal resistance (RθJEC) of 21 °C/W (as part of the 1N6321US–1N6355US group). Its power dissipation must be linearly derated above 150 °C end-cap temperature, reaching zero at 175 °C - per Figure 2 in the official datasheet T4-LDS-0193-1.
Does 1N6348US/TR have radiation hardness, and is documentation available?
Yes, 1N6348US/TR exhibits inherent radiation hardness validated per Microsemi MicroNote 050. This stems from its voidless hermetic glass construction and tungsten slug design - not requiring external shielding. Full radiation test data is available in MicroNote 050, accessible via Microchip's archived technical library.
Can 1N6348US/TR be used in RoHS-compliant assemblies?
RoHS-compliant versions of 1N6348US/TR are available for commercial-grade use only, with matte tin end-cap finish. Military-grade variants (JAN/JANTX/JANTXV/JANS) retain Sn/Pb terminations per MIL-STD-1276 compliance and are exempt from RoHS restrictions under EU Directive Annex III.
1N6348US/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):
- 100 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 340 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 76 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
1N6348US/TR FAQ
1.How can I place an order for 1N6348US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6348US/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 1N6348US/TR reliable?
The price and inventory of 1N6348US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6348US/TR is usually 5 days.
3.What payment methods are accepted for 1N6348US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6348US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6348US/TR?
1N6348US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6348US/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 1N6348US/TR?
For technical support, including 1N6348US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6348US/TR requirements.
6.How does Aetrix verify that 1N6348US/TR is sourced from the original manufacturer or authorized distributors?
All 1N6348US/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 1N6348US/TR meets industry standards.
7.What is the process for return or replacement of 1N6348US/TR?
All 1N6348US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N6348US/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 1N6348US/TR part is unused and in its original packaging.
Return procedure for 1N6348US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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