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Microchip Technology JANTX1N4972DUS/TR
- Part No.:
- JANTX1N4972DUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4972DUS/TR.pdf
- Description:
- DIODE ZENER 39V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:6,473
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Product details
Overview
JANTX1N4972DUS/TR from Microsemi is a military-grade, hermetically sealed surface-mount Zener diode rated for 5 W power dissipation at 140 °C end-cap temperature, with nominal Zener voltage of 39 V ±5%, dynamic impedance of 14 Ω at 30 mA test current, and operating junction temperature range from –65 °C to +175 °C. It serves as a precision voltage reference and overvoltage clamp in high-reliability aerospace power conditioning circuits.
For engineers reviewing the JANTX1N4972DUS/TR datasheet, JANTX1N4972DUS/TR pinout, JANTX1N4972DUS/TR application, or JANTX1N4972DUS/TR equivalent, this part delivers verified MIL-PRF-19500/356 Class JANTX qualification, voidless-glass hermeticity, Category I metallurgical bonding, radiation hardness per MicroNote 050, and ESD immunity per MIL-STD-750 Method 1020 - critical for flight-critical voltage regulation where failure is not tolerable.
Technical Context
This device operates in reverse-biased Zener breakdown mode with tightly controlled voltage regulation across 10%–50% of maximum Zener current (IZM = 930 mA), exhibiting ΔVZ ≤ 3.0 V under that load variation. Its thermal resistance is 7 °C/W junction-to-end-cap, enabling stable regulation under transient thermal stress in conduction-cooled avionics modules.
The "DUS" suffix denotes surface-mount "E" package (also known as D-5B) with copper end caps and Sn/Pb finish, cathode band polarity marking, and EIA-481-B tape-and-reel packaging. It shares electrical characteristics and mechanical form with the full 1N4954US–1N4996US family but is specifically qualified to JANTX level per MIL-PRF-19500/356.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V ±5% at IZT = 30 mA - defines stable regulation point for primary power rail clamping |
| Power Dissipation | 5 W @ TEC = 140 °C - supports continuous operation in high-ambient military enclosures without forced cooling |
| Dynamic Impedance (ZZ) | 14 Ω @ IZT = 30 mA - ensures <1.5 V output deviation under 100 mA load step changes |
| Max Reverse Leakage (IR) | 2 μA @ VR = 29.7 V - guarantees minimal quiescent current draw in standby-mode satellite subsystems |
| Junction Temperature Range | –65 °C to +175 °C - enables deployment in engine-mounted sensors and space-rated power converters |
| Thermal Resistance (RθJC) | 7 °C/W junction-to-end-cap - allows direct thermal path to cold plate via end-cap soldering |
| Surge Current (IZSM) | 4.0 A @ 8.3 ms - withstands lightning-induced transients in aircraft DC bus protection |
Pinout & Package
Package: Hermetically sealed voidless hard glass "E" package (JEDEC D-5B), with tungsten slugs and copper end caps finished in Sn/Pb. Cathode identified by black band. Weight: 539 mg. Tape-and-reel compliant with EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Soldered to ground or return plane; forms low-impedance path for surge current during overvoltage events |
| Cathode | Zener breakdown terminal / regulated voltage node | Connected to protected rail; maintains 39 V ±5% under 30 mA to 930 mA operating current |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Prevents moisture ingress and internal corrosion over 20+ year mission life in vacuum or humid environments |
| Category I metallurgical bond | Ensures mechanical integrity under 20 g vibration and thermal cycling from –65 °C to +175 °C |
| MIL-PRF-19500/356 JANTX qualification | Validated screening includes burn-in, temperature cycling, and lot acceptance testing per military standard |
| Radiation hardness | Specified per Microsemi MicroNote 050 - suitable for low-earth-orbit satellite power regulation |
| ESD immunity | Compliant with MIL-STD-750 Method 1020 - survives >8 kV HBM without parameter shift |
Applications
| Aerospace Power Bus Protection | Avionics Voltage Reference |
|---|---|
Use Scenario: Clamping 28 V DC aircraft bus against load dump and lightning-induced surges up to 100 V. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator and transient voltage suppressor. Use Value: JANTX1N4972DUS/TR's 4.0 A 8.3 ms surge rating and 7 °C/W thermal resistance enable single-device bus protection without external heatsinking. |
Use Scenario: Providing stable 39 V reference for analog-to-digital converter biasing in inertial measurement units. IC Role / Device Role / Timing Role: Precision Zener reference source with <±0.2 V drift over –55 °C to +125 °C. Use Value: JANTX1N4972DUS/TR's ±5% tolerance and 14 Ω dynamic impedance ensure <0.5 LSB error in 16-bit ADC systems. |
| Satellite Power Converter Feedback | Tactical Radio RF Stage Bias |
Use Scenario: Secondary-side voltage sensing in isolated DC–DC converters for CubeSat power management. IC Role / Device Role / Timing Role: Zener-based feedback element in optocoupler-isolated regulation loop. Use Value: JANTX1N4972DUS/TR's radiation hardness and –65 °C to +175 °C operation support unshielded LEO missions with no derating. |
Use Scenario: Setting gate bias voltage for GaN RF power amplifiers in manpack radios exposed to desert temperature extremes. IC Role / Device Role / Timing Role: Stable voltage reference for amplifier bias network under wide thermal swing. Use Value: JANTX1N4972DUS/TR's <2 μA leakage at 29.7 V prevents bias drift and gain compression in high-frequency stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4972US | Same electrical specs and package, but commercial-grade (non-military) with no MIL-PRF-19500 screening | Lacks JANTX-level burn-in, temperature cycling, and radiation data - unsuitable for flight hardware | Select only for ground-test fixtures or non-safety-critical prototypes |
| JANTXV1N4972DUS/TR | Identical Zener parameters and package, but qualified to JANTXV per MIL-PRF-19500/356 with enhanced screening | Includes additional radiation testing and extended life testing - required for manned spacecraft and missile guidance | Choose when mission assurance requires highest reliability tier beyond JANTX |
Compared with 1N4972US and JANTXV1N4972DUS/TR, JANTX1N4972DUS/TR provides validated military screening and radiation performance at lower cost than JANTXV, making it the optimal selection for unmanned UAV power systems and hardened ground stations.
Availability
JANTX1N4972DUS/TR is available at Aetrix Electronics and suitable for aerospace power bus protection, avionics voltage reference, satellite power converter feedback, and tactical radio RF stage bias requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTX1N4972DUS/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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets.
The JANTX1N4972DUS/TR belongs to Microsemi's legacy 1N49xxUS military Zener series, designed specifically for voltage regulation in mission-critical systems where hermeticity, radiation tolerance, and extreme temperature operation are mandatory.
FAQ
What is the Zener voltage tolerance for JANTX1N4972DUS/TR?
JANTX1N4972DUS/TR has a nominal Zener voltage of 39 V with a tolerance of ±5%, as specified in the Microsemi SD44A datasheet. This tolerance applies at the test current IZT = 30 mA and ambient temperature of 25 °C. The part does not carry C or D suffixes indicating tighter 2% or 1% tolerances.
Does JANTX1N4972DUS/TR require derating above 140 °C end-cap temperature?
Yes, JANTX1N4972DUS/TR must be linearly derated above 140 °C end-cap temperature, reaching zero power dissipation at 175 °C. Derating follows the formula PD = 5 W × (1 − (TEC − 140)/35), where TEC is end-cap temperature in °C. This reflects its 7 °C/W thermal resistance and thermal design envelope.
Is JANTX1N4972DUS/TR compatible with lead-free reflow processes?
No, JANTX1N4972DUS/TR features Sn/Pb finish on copper end caps and is not qualified for lead-free reflow. Its maximum peak reflow temperature is limited to 235 °C per Microsemi's assembly guidelines. Lead-free alternatives require redesign and validation due to differing wetting behavior and thermal stress profiles.
What is the maximum reverse leakage current for JANTX1N4972DUS/TR at 29.7 V?
The maximum reverse leakage current for JANTX1N4972DUS/TR is 2 μA at VR = 29.7 V and TA = 25 °C, as confirmed in the SD44A datasheet's Electrical Characteristics table. This value remains ≤5 μA across the full –65 °C to +125 °C operating range per qualification testing.
How is polarity indicated on JANTX1N4972DUS/TR?
JANTX1N4972DUS/TR uses a black cathode band on the glass body to indicate polarity. The banded end is the cathode; the opposite end is the anode. This marking is visible after placement and is consistent across all 1N49xxUS surface-mount Zeners in the Microsemi family.
JANTX1N4972DUS/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SQ-MELF, E
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±1%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 14 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 29.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 1 A
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Military
- Qualification:
- MIL-PRF-19500/356
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- E-MELF
JANTX1N4972DUS/TR FAQ
1.How can I place an order for JANTX1N4972DUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4972DUS/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 JANTX1N4972DUS/TR reliable?
The price and inventory of JANTX1N4972DUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4972DUS/TR is usually 5 days.
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JANTX1N4972DUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4972DUS/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 JANTX1N4972DUS/TR?
For technical support, including JANTX1N4972DUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4972DUS/TR requirements.
6.How does Aetrix verify that JANTX1N4972DUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4972DUS/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 JANTX1N4972DUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4972DUS/TR?
All JANTX1N4972DUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4972DUS/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 JANTX1N4972DUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4972DUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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