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Microchip Technology 1N6349US/TR
- Part No.:
- 1N6349US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, B
- Datasheet:
-
1N6349US/TR.pdf
- Description:
- DIODE ZENER 110V 500MW SQ-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
1N6349US/TR from Microsemi is a military-qualified, voidless hermetically sealed glass Zener diode with nominal Zener voltage of 110.0 V, ±5% tolerance, 0.5 W power rating, and 3.9 Ω dynamic impedance at 500 mA test current-designed for high-reliability voltage regulation in aerospace power conditioning and radiation-hardened instrumentation.
For engineers reviewing the 1N6349US/TR datasheet, 1N6349US/TR pinout, 1N6349US/TR application, or 1N6349US/TR equivalent, this part delivers verified MIL-PRF-19500/533 compliance (JANTXV level), low temperature coefficient (+0.110 %/°C), and robust ESD immunity per MIL-STD-750 Method 1020 in a surface-mount B-SQ MELF package.
Technical Context
This device operates as a precision shunt voltage regulator in reverse-biased breakdown mode, maintaining stable output voltage across 10–50% of IZM (500 mA) with ≤4.80 V regulation deviation. Its internal Category I metallurgical bond ensures mechanical integrity under thermal cycling and shock.
The 1N6349US/TR exhibits 2,800 Ω dynamic impedance at 250 µA (ZZK), enabling low-noise operation (≤84 µV/√Hz, 1–3 kHz), while its junction-to-end-cap thermal resistance of 21 °C/W supports reliable power dissipation up to 0.5 W at TEC = 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 110.0 V nominal at 500 mA - defines precise regulation point for high-voltage reference circuits |
| Power Dissipation (PD) | 0.5 W at TEC = 150 °C - sets maximum continuous DC power handling in end-cap mounted configuration |
| Dynamic Impedance (ZZT) | 3.9 Ω at IZT = 500 mA - determines output voltage stability under load current variation |
| Temp. Coefficient (αVZ) | +0.110 %/°C - quantifies voltage drift over temperature for precision biasing applications |
| Max. Surge Current (IZSM) | 84 A (8.3 ms square wave) - enables transient overvoltage clamping without failure |
| Noise Density | ≤84 µV/√Hz (1–3 kHz) - supports low-noise analog references in sensitive measurement systems |
| Reverse Leakage (IR) | 10 µA max at 84 V, 150 °C - ensures minimal standby current in high-temp environments |
Pinout & Package
Hermetically sealed B-SQ MELF (cylindrical glass) package with copper end caps, tin/lead or RoHS-compliant matte tin finish; cathode indicated by black 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 circuit ground or lower potential node during regulation |
| Cathode | Zener breakdown terminal / high-side connection | Connected to unregulated input; voltage referenced to anode during reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass construction | Eliminates moisture ingress and internal delamination risks in long-life space-grade deployments |
| Category I internal metallurgical bond | Ensures mechanical reliability under MIL-STD-883 vibration and thermal shock testing |
| JANTXV reliability qualification | Validated per MIL-PRF-19500/533 for mission-critical avionics and defense electronics |
| Radiation hardness | Inherently tolerant to total ionizing dose (TID) per MicroNote 050, suitable for LEO missions |
| ESD immunity | Non-sensitive per MIL-STD-750 Method 1020 - no external protection required in clean-room assembly |
Applications
| Avionics Power Bus Regulation | Satellite Sensor Bias Supply |
|---|---|
Use Scenario: Stabilizing 110 V auxiliary bus in flight control computers under wide temperature (-65 to +175 °C) and radiation exposure. IC Role / Device Role / Timing Role: Shunt voltage regulator providing reference-stable bias for ADCs and op-amps. Use Value: Maintains ≤4.80 V regulation deviation across 10–50% of 500 mA load, ensuring data integrity in real-time control loops. |
Use Scenario: Generating ultra-stable 110 V bias for CCD/CMOS imaging sensor arrays in low-earth orbit payloads. IC Role / Device Role / Timing Role: Precision voltage reference source with <84 µV/√Hz noise in 1–3 kHz band. Use Value: Enables sub-LSB analog performance in radiation-hardened imaging chains without active compensation. |
| Nuclear Instrumentation Calibration | High-Voltage Test Equipment Reference |
Use Scenario: Calibrating portable gamma spectrometers operating in extreme ambient conditions (−65 to +175 °C). IC Role / Device Role / Timing Role: Primary voltage standard traceable to NIST via MIL-qualified process controls. Use Value: Delivers ±5% initial tolerance and +0.110 %/°C tempco-meeting ANSI N42.34 Class A accuracy requirements. |
Use Scenario: Serving as a ruggedized 110 V reference in field-deployable insulation resistance testers. IC Role / Device Role / Timing Role: Overvoltage clamp and calibration reference in high-impedance feedback networks. Use Value: Withstands 84 A surge (8.3 ms) and maintains <10 µA leakage at 150 °C-ensuring repeatability across 10,000+ test cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N6349US | Same electrical specs, but supplied in bulk (not tape-and-reel); lacks TR suffix packaging | Preferred for manual prototyping or low-volume hand-soldered assemblies | Select 1N6349US/TR when automated SMT placement and traceable reel logistics are required |
| SMF110A | Surface-mount SOD-123 package; 110 V, 1 W rating; higher PD, larger ZZT (≥10 Ω) | Better suited for commercial industrial power supplies where radiation hardness is not required | Choose SMF110A only if JANTXV qualification, hermeticity, and <84 µV/√Hz noise are unnecessary |
Compared with 1N6349US/TR, the 1N6349US offers identical regulation performance but lacks tape-and-reel logistics support, while SMF110A trades military reliability and low-noise performance for higher power and lower cost in non-aerospace designs.
Availability
1N6349US/TR is available at Aetrix Electronics and suitable for avionics power conditioning, satellite sensor biasing, and nuclear instrumentation calibration requiring stable component supply with full MIL-PRF-19500 traceability and radiation-hardened assurance.
Supply support for 1N6349US/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 aerospace-grade components.
The 1N6349US/TR belongs to Microsemi's legacy MIL-qualified Zener diode family, engineered specifically for voltage reference and regulation in mission-critical defense, space, and nuclear systems where failure is not an option.
FAQ
What is the Zener voltage tolerance of the 1N6349US/TR?
The 1N6349US/TR has a nominal Zener voltage of 110.0 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% or ±2%) are available under different part number suffixes (e.g., D or C), but the /TR variant retains the base ±5% specification. This tolerance applies at 25 °C with IZ = 500 mA.
Is the 1N6349US/TR qualified to MIL-PRF-19500/533?
Yes, the 1N6349US/TR is qualified to MIL-PRF-19500/533 at the JANTXV reliability level, as explicitly stated in the "Qualified Levels" section on page 1 of the datasheet. This qualification includes screening for vibration, thermal shock, and hermeticity-making the 1N6349US/TR suitable for flight-critical avionics and defense electronics.
What is the maximum steady-state power dissipation for the 1N6349US/TR?
The 1N6349US/TR has a steady-state power dissipation (PD) of 0.5 W at an end-cap temperature (TEC) of 150 °C, per the Maximum Ratings table on page 1. Derating is required above 150 °C using RθJEC = 21 °C/W (valid for 1N6321US–1N6355US series), and the device must be mounted with appropriate thermal path to maintain safe junction temperatures.
Does the 1N6349US/TR have radiation hardness certification?
Yes, the 1N6349US/TR is inherently radiation hard, as documented in Microsemi MicroNote 050 referenced on page 1. While not individually tested per MIL-STD-883 method 1019, its voidless hermetic glass construction and Category I metallurgical bond provide proven tolerance to total ionizing dose (TID) in low-earth orbit environments-confirmed through family-level radiation testing history.
What does the "TR" suffix indicate in 1N6349US/TR?
The "TR" suffix in 1N6349US/TR denotes tape-and-reel packaging per EIA-481-B standard, enabling automated surface-mount assembly. This differs from the base 1N6349US, which is supplied in bulk. The electrical, thermal, and reliability specifications-including JANTXV qualification and hermetic sealing-are identical between both variants; only the packaging format differs.
1N6349US/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):
- 110 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 500 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 84 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
1N6349US/TR FAQ
1.How can I place an order for 1N6349US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6349US/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 1N6349US/TR reliable?
The price and inventory of 1N6349US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6349US/TR is usually 5 days.
3.What payment methods are accepted for 1N6349US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6349US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6349US/TR?
1N6349US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6349US/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 1N6349US/TR?
For technical support, including 1N6349US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6349US/TR requirements.
6.How does Aetrix verify that 1N6349US/TR is sourced from the original manufacturer or authorized distributors?
All 1N6349US/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 1N6349US/TR meets industry standards.
7.What is the process for return or replacement of 1N6349US/TR?
All 1N6349US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N6349US/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 1N6349US/TR part is unused and in its original packaging.
Return procedure for 1N6349US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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