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Microchip Technology JANTXV1N4979DUS/TR
- Part No.:
- JANTXV1N4979DUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTXV1N4979DUS/TR.pdf
- Description:
- DIODE ZENER 75V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:2,436
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Product details
Overview
JANTXV1N4979DUS/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 75 V at 20 mA test current, ±5% tolerance, and dynamic impedance of 55 Ω - used in high-reliability voltage regulation for aerospace power conditioning circuits.
For engineers reviewing the JANTXV1N4979DUS/TR datasheet, JANTXV1N4979DUS/TR pinout, JANTXV1N4979DUS/TR application, or JANTXV1N4979DUS/TR equivalent, key selection criteria include its MIL-PRF-19500/356 qualification, -65 °C to +175 °C operating temperature range, hermetic glass package with tungsten slugs, and 2 μA maximum reverse leakage at 57 V.
Technical Context
This device operates as a precision shunt voltage regulator in breakdown mode, maintaining stable output voltage across wide current (10%–50% of IZM) and temperature ranges. Its Category III internal metallurgical bond and triple-layer passivation ensure robustness against thermal cycling and environmental stress.
The JANTXV1N4979DUS/TR exhibits a Zener voltage temperature coefficient of +0.100 %/°C and a thermal resistance of 10 °C/W junction-to-end-cap - critical for thermal design in sealed avionics enclosures where conduction cooling dominates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 75 V at 20 mA test current - defines regulated output voltage under nominal bias |
| Power Dissipation | 5 W @ TEC = 140 °C - sets maximum continuous thermal load in surface-mount layout |
| Dynamic Impedance (ZZ) | 55 Ω at 20 mA - determines regulation error under load transients |
| Reverse Leakage (IR) | 2 μA max at 57 V - ensures low standby power loss in high-impedance reference paths |
| Operating Temperature | -65 °C to +175 °C - enables deployment in unheated satellite bays and engine-mounted control units |
| Surge Current (IZSM) | 2 A @ 8.3 ms - withstands lightning-induced transients per DO-160 Section 22 Level 3 |
| Forward Voltage (VF) | 1.5 V at 1.0 A - supports use as clamping diode in bidirectional protection schemes |
Pinout & Package
Package: Hermetically sealed voidless hard glass case with tungsten slugs, "E" outline (also designated D-5B), cathode indicated by band, copper end caps with Sn/Pb finish, weight 539 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink in forward bias; reference node in reverse-bias regulation | Connected to system ground or lower-potential rail during Zener operation |
| Cathode | Current source in reverse breakdown; regulated output node | Connected to input supply rail; voltage at this terminal is stabilized at 75 V |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass construction | Eliminates internal delamination risk under thermal shock and vacuum exposure |
| Category III metallurgical bond | Guarantees mechanical integrity under 20,000 g shock per MIL-STD-883 Method 2002 |
| Nonsensitive to ESD | Withstands ≥4 kV HBM without parameter shift - reduces handling controls in cleanroom assembly |
| Inherent radiation hardness | Qualified to 100 krad(Si) TID per MicroNote 050 - suitable for LEO spacecraft power rails |
| Tape-and-reel packaging | EIA-481-B compliant - enables automated placement in high-mix military PCB assembly |
Applications
| Avionics Power Bus Regulation | Satellite Payload Reference Supply |
|---|---|
Use Scenario: Stabilizing 75 V intermediate bus in airborne radar transmitter modules subject to wide input variation and vibration. IC Role / Device Role / Timing Role: Shunt voltage regulator providing precise DC reference for RF amplifier bias networks. Use Value: Maintains <±1.5% output stability over -55 °C to +125 °C ambient, enabling consistent RF gain calibration. | Use Scenario: Generating stable 75 V bias for CCD sensor readout circuitry in Earth observation satellites. IC Role / Device Role / Timing Role: Primary voltage reference element in radiation-tolerant analog front-end. Use Value: Delivers <2 μA leakage at 57 V and survives 100 krad(Si) total ionizing dose without Zener voltage drift >±0.5%. |
| Missile Guidance System Sensor Bias | Nuclear Plant Control Loop Reference |
Use Scenario: Providing regulated excitation voltage for piezoresistive accelerometers in tactical missile inertial measurement units. IC Role / Device Role / Timing Role: High-reliability shunt regulator ensuring sensor bridge excitation remains within ±0.1% tolerance. Use Value: Operates continuously at 175 °C junction temperature with no derating required - eliminates need for active cooling. | Use Scenario: Serving as fail-safe voltage clamp in reactor protection system analog comparators. IC Role / Device Role / Timing Role: Overvoltage protection element that activates only above 78.8 V (105% of nominal). Use Value: Withstands 2 A surge for 8.3 ms per IEEE C37.90.1 - prevents false trip during grid fault transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4979US | No TR suffix - bulk packaging instead of tape-and-reel; identical electrical specs and hermetic construction | Preferred for manual prototyping or low-volume hand-soldered assemblies | Select JANTXV1N4979US when reel feeding is unnecessary and cost-per-unit optimization is prioritized |
| 1N4979US | Commercial-grade (non-military) version; same Zener voltage and package but lacks MIL-PRF-19500/356 qualification and Category III bond | Suitable for industrial test equipment where radiation hardness and extended temperature range are not required | Choose 1N4979US only for non-safety-critical applications with full lifecycle traceability waived |
Compared with JANTXV1N4979US and 1N4979US, the JANTXV1N4979DUS/TR provides guaranteed tape-and-reel delivery for SMT production, full JAN-class screening including burn-in and life test, and documented performance at extreme temperatures - making it the sole option for flight-critical hardware requiring DoD traceability.
Availability
JANTXV1N4979DUS/TR is available at Aetrix Electronics and suitable for avionics power bus regulation, satellite payload reference supply, and missile guidance system sensor bias requiring stable component supply with full MIL-spec compliance and lot-level traceability.
Supply support for JANTXV1N4979DUS/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 analog and mixed-signal semiconductors for aerospace, defense, and industrial markets, with emphasis on radiation-hardened and extended-temperature solutions.
The JANTXV1N4979DUS/TR belongs to Microsemi's military-qualified Zener diode family built for mission-critical voltage regulation - engineered to meet MIL-PRF-19500/356 requirements in harsh environments where failure is not an option.
FAQ
What is the Zener voltage tolerance for JANTXV1N4979DUS/TR?
The JANTXV1N4979DUS/TR has a nominal Zener voltage of 75 V with a standard tolerance of ±5%, as specified in the Microsemi SD44A datasheet. This tolerance applies at 25 °C and 20 mA test current, and is maintained across the full -65 °C to +175 °C operating range per MIL-PRF-19500/356 screening.
Does JANTXV1N4979DUS/TR require derating above 140 °C end-cap temperature?
Yes, JANTXV1N4979DUS/TR must be linearly derated above 140 °C end-cap temperature, reaching zero power dissipation at 175 °C. This derating curve is defined in the Maximum Ratings table of the SD44A datasheet and reflects the thermal resistance of 10 °C/W junction-to-end-cap for this variant.
Is JANTXV1N4979DUS/TR compatible with lead-free reflow processes?
No, JANTXV1N4979DUS/TR uses tin/lead (Sn/Pb) finish on copper end caps and is qualified only for eutectic solder reflow profiles. Lead-free reflow exceeds its thermal limits and violates MIL-PRF-19500/356 process compliance - use only with Sn63/Pb37 solder paste and peak temperatures ≤220 °C.
What is the maximum reverse leakage current for JANTXV1N4979DUS/TR?
The maximum reverse leakage current for JANTXV1N4979DUS/TR is 2 μA at 57 V (76% of nominal Zener voltage), measured at 25 °C. This value is confirmed in the Electrical Characteristics table of the SD44A datasheet and remains valid across the full military temperature range per screening data.
How is polarity marked on JANTXV1N4979DUS/TR?
JANTXV1N4979DUS/TR uses a cathode band marking on the glass body to indicate polarity - the banded end is the cathode, which must be connected to the higher-potential side of the circuit during Zener operation. No other markings are present per the Mechanical and Packaging section of the SD44A datasheet.
JANTXV1N4979DUS/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):
- 75 V
- Tolerance:
- ±1%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 56 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
JANTXV1N4979DUS/TR FAQ
1.How can I place an order for JANTXV1N4979DUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTXV1N4979DUS/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 JANTXV1N4979DUS/TR reliable?
The price and inventory of JANTXV1N4979DUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTXV1N4979DUS/TR is usually 5 days.
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Once your JANTXV1N4979DUS/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 JANTXV1N4979DUS/TR?
For technical support, including JANTXV1N4979DUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTXV1N4979DUS/TR requirements.
6.How does Aetrix verify that JANTXV1N4979DUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTXV1N4979DUS/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 JANTXV1N4979DUS/TR meets industry standards.
7.What is the process for return or replacement of JANTXV1N4979DUS/TR?
All JANTXV1N4979DUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTXV1N4979DUS/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 JANTXV1N4979DUS/TR part is unused and in its original packaging.
Return procedure for JANTXV1N4979DUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
JANTXV1N4979DUS/TR Tags
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