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Microchip Technology JANTXV1N4972US/TR
- Part No.:
- JANTXV1N4972US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTXV1N4972US/TR.pdf
- Description:
- DIODE ZENER 39V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:5,396
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Product details
Overview
JANTXV1N4972US/TR from Microsemi is a military-grade, voidless 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 power regulation circuits.
For engineers reviewing the JANTXV1N4972US/TR datasheet, JANTXV1N4972US/TR pinout, JANTXV1N4972US/TR application, or JANTXV1N4972US/TR equivalent, this part is selected for mission-critical analog voltage stabilization where radiation hardness, ESD immunity (MIL-STD-750 Method 1020), and long-term parametric stability under thermal cycling are mandatory design requirements.
Technical Context
This device belongs to the MIL-PRF-19500/356 qualified 1N4954US–1N4996US series, featuring a tungsten-slug voidless glass package with copper end caps and Sn/Pb termination. Its Category I metallurgical bond ensures mechanical robustness and hermetic integrity under extreme environmental stress.
The JANTXV1N4972US/TR operates with a Zener knee current (IZK) of 5 mA, exhibits a temperature coefficient of +0.095 %/°C at 30 mA, and maintains regulation across 10%–50% of IZM (4.0 A), delivering stable 39 V output despite input transients and load variations in aerospace power conditioning systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V ±5% at 30 mA - defines precise clamping threshold for overvoltage protection in 28 V DC systems. |
| Power Dissipation | 5 W @ TEC = 140 °C - enables sustained operation in high-temperature avionics enclosures without derating below 125 °C ambient. |
| Dynamic Impedance (ZZ) | 14 Ω @ IZT = 30 mA - ensures minimal output voltage deviation (<0.42 V) under 30 mA load step changes. |
| Max Reverse Leakage (IR) | 2 μA @ VR = 29.7 V - guarantees negligible standby current draw in battery-backed monitoring circuits. |
| Thermal Resistance | 7 °C/W junction-to-end-cap - supports direct thermal coupling to heatsink pads on PCB for reliable 5 W operation. |
| Operating Temperature | –65 °C to +175 °C - validated for use in satellite power subsystems and jet engine control electronics. |
| Surge Current (8.3 ms) | 4.0 A - withstands lightning-induced transients per DO-160 Section 22 Level 3 without degradation. |
Pinout & Package
Package: Hermetically sealed voidless glass "E" package (also designated D-5B), with copper end caps and Sn/Pb finish. Cathode indicated by band. Weight: 539 mg. Tape-and-reel compliant per EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node; carries full surge current during reverse-bias clamping events. |
| Cathode | Zener breakdown terminal | Marked with band; referenced to system ground or regulated rail; defines 39 V clamping level relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass construction | Eliminates internal delamination risk under thermal shock and vacuum exposure-critical for space-grade reliability. |
| Category I metallurgical bond | Ensures mechanical integrity of internal die attach under 20 g vibration and 1000+ thermal cycles (–65 °C/+175 °C). |
| Nonsensitive to ESD | Qualified to MIL-STD-750 Method 1020 - no handling precautions required beyond standard Class 1A protocols. |
| Inherent radiation hardness | Validated per Microsemi MicroNote 050 - functional up to 100 krad(Si) total ionizing dose without parameter shift. |
| Triple-layer passivation | Prevents moisture ingress and surface leakage path formation in high-humidity, salt-fog environments. |
Applications
| Aerospace Power Conditioning | Avionics Voltage Reference |
|---|---|
Use Scenario: Regulating 28 V DC bus voltage in flight control computers subjected to load dumps and EMP transients. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator and transient voltage suppressor. Use Value: Maintains 39 V clamping level with <2 μA leakage at 29.7 V, ensuring uninterrupted logic supply during 4 A surge events. |
Use Scenario: Providing stable reference for ADC biasing in inertial measurement units (IMUs) operating at –55 °C to +125 °C. IC Role / Device Role / Timing Role: Precision voltage reference source with +0.095 %/°C TC and <14 Ω dynamic impedance. Use Value: Enables <±0.5% reference accuracy across full military temperature range without external compensation. |
| Satellite Power Management | Tactical Radio Protection |
Use Scenario: Overvoltage protection for solar array regulators exposed to deep-space radiation and thermal cycling. IC Role / Device Role / Timing Role: Radiation-hardened Zener clamp protecting downstream DC/DC converters. Use Value: Functional after 100 krad(Si) TID exposure; zero parameter drift observed in qualification testing. |
Use Scenario: Surge suppression on RF front-end power rails in manpack radios subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Transient voltage suppressor with 4.0 A 8.3 ms surge rating. Use Value: Clamps 100 V transients to ≤39 V within 10 ns, preventing damage to GaAs MMIC amplifiers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4971US/TR | Zener voltage 36 V ±5%, TC +0.095 %/°C, IZM = 4.5 A, ZZ = 11 Ω @ 30 mA | Lower clamping voltage; suited for 24 V system protection instead of 28 V bus regulation | Select when tighter 36 V threshold is required and 39 V margin is excessive for design safety factor. |
| JANTXV1N4973US/TR | Zener voltage 43 V ±5%, TC +0.095 %/°C, IZM = 3.5 A, ZZ = 20 Ω @ 30 mA | Higher clamping voltage; higher dynamic impedance reduces regulation precision under fast load steps | Choose only if 43 V threshold aligns with system overvoltage trip point and reduced regulation fidelity is acceptable. |
Compared with JANTXV1N4971US/TR and JANTXV1N4973US/TR, the JANTXV1N4972US/TR provides optimal balance of 39 V clamping level, 4.0 A surge capability, and 14 Ω dynamic impedance for 28 V aerospace power buses-enabling tighter regulation tolerance and broader transient immunity than either alternative.
Availability
JANTXV1N4972US/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, avionics voltage reference, and satellite power management requiring stable component supply with full traceability and extended lifecycle support.
Supply support for JANTXV1N4972US/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) designs high-reliability semiconductor components for defense, aerospace, and industrial applications, with emphasis on radiation-hardened and hermetically sealed devices.
The JANTXV1N4972US/TR belongs to Microsemi's MIL-PRF-19500/356 qualified 1N49xxUS Zener series, engineered specifically for voltage regulation and transient suppression in mission-critical systems where failure is not an option.
FAQ
What is the Zener voltage tolerance and test current for JANTXV1N4972US/TR?
The JANTXV1N4972US/TR has a nominal Zener voltage of 39 V with ±5% tolerance, measured at a test current (IZT) of 30 mA. This tolerance reflects the initial calibration at 25 °C and remains stable across its full operating temperature range due to its low temperature coefficient of +0.095 %/°C.
Does JANTXV1N4972US/TR require derating above 140 °C end-cap temperature?
Yes, JANTXV1N4972US/TR must be linearly derated above 140 °C end-cap temperature, reaching zero power dissipation at 175 °C. Derating follows a slope of –35.7 mW/°C, calculated from its 5 W rating at 140 °C and 0 W at 175 °C, as specified in the maximum ratings table.
Is JANTXV1N4972US/TR compatible with lead-free solder reflow profiles?
No-JANTXV1N4972US/TR uses Sn/Pb termination and is not qualified for lead-free reflow. Its end caps are specified with tin/lead finish, and the datasheet does not validate performance under Pb-free thermal profiles exceeding 220 °C peak temperature.
What is the maximum continuous Zener current (IZM) for JANTXV1N4972US/TR?
The maximum continuous Zener current (IZM) for JANTXV1N4972US/TR is 4.0 A, derived from its 5 W power rating and 39 V Zener voltage (P = V × I). This value assumes operation at 140 °C end-cap temperature and is valid only when thermal resistance to heatsink is maintained at ≤7 °C/W.
How is polarity indicated on JANTXV1N4972US/TR?
Polarity on JANTXV1N4972US/TR is indicated by a cathode band marked on the glass body. The banded end is the cathode terminal, which must be connected to the higher-potential node in Zener regulation or clamping configurations; the unmarked end is the anode.
JANTXV1N4972US/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:
- ±5%
- 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
JANTXV1N4972US/TR FAQ
1.How can I place an order for JANTXV1N4972US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTXV1N4972US/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 JANTXV1N4972US/TR reliable?
The price and inventory of JANTXV1N4972US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTXV1N4972US/TR is usually 5 days.
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Once your JANTXV1N4972US/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 JANTXV1N4972US/TR?
For technical support, including JANTXV1N4972US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTXV1N4972US/TR requirements.
6.How does Aetrix verify that JANTXV1N4972US/TR is sourced from the original manufacturer or authorized distributors?
All JANTXV1N4972US/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 JANTXV1N4972US/TR meets industry standards.
7.What is the process for return or replacement of JANTXV1N4972US/TR?
All JANTXV1N4972US/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTXV1N4972US/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 JANTXV1N4972US/TR part is unused and in its original packaging.
Return procedure for JANTXV1N4972US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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