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Microchip Technology JANTXV1N4979CUS/TR
- Part No.:
- JANTXV1N4979CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTXV1N4979CUS/TR.pdf
- Description:
- DIODE ZENER 75V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:5,934
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Product details
Overview
JANTXV1N4979CUS/TR from Microsemi is a surface-mount, voidless-hermetically-sealed 5 W glass Zener diode with nominal Zener voltage of 75 V, ±2% tolerance (C suffix), and maximum power dissipation of 5 W at 140 °C end-cap temperature. It operates across –65 °C to +175 °C, features 55 Ω dynamic impedance at 20 mA test current, and delivers stable voltage regulation in high-reliability military and aerospace power conditioning circuits.
For engineers reviewing the JANTXV1N4979CUS/TR datasheet, JANTXV1N4979CUS/TR pinout, JANTXV1N4979CUS/TR application, or JANTXV1N4979CUS/TR equivalent, this part supports precision voltage reference, overvoltage clamping, and regulator feedback in harsh-environment analog subsystems where hermetic sealing, radiation hardness, and MIL-PRF-19500/356 qualification are mandatory.
Technical Context
This device belongs to the JANTXV-grade 1N49xxUS series, qualified per MIL-PRF-19500/356 for Class V (space-level) reliability. Its voidless-glass construction uses Category I internal metallurgical bonds and triple-layer passivation to ensure long-term stability under thermal cycling and radiation exposure.
The JANTXV1N4979CUS/TR exhibits a temperature coefficient of +0.100 %/°C at 20 mA, reverse leakage ≤2 μA at 56 V, and forward voltage ≤1.50 V at 1.0 A - enabling predictable behavior in both breakdown and conduction modes across its full operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 75 V ±2% at 20 mA - enables precise 75 V reference or clamp with tight tolerance for feedback loops |
| Power Dissipation | 5 W @ TEC = 140 °C - supports sustained regulation in compact, high-temperature PCB layouts |
| Dynamic Impedance (ZZ) | 55 Ω @ IZT = 20 mA - ensures low output impedance for stable regulation under load transients |
| Max Reverse Leakage (IR) | 2 μA @ VR = 56 V - minimizes standby current in high-impedance bias networks |
| Operating Temperature | –65 °C to +175 °C - certified for extended-range operation in avionics, downhole, and space electronics |
| Thermal Resistance | 7 °C/W junction-to-end-cap - allows accurate thermal modeling for heatsink-free mounting on copper pads |
| Surge Current (8.3 ms) | 2.0 A - withstands transient overvoltage events without degradation |
Pinout & Package
Package: Hermetically sealed voidless hard glass case with tungsten slugs, "E" package (also known as "D-5B"), surface-mount configuration with copper end caps and Sn/Pb finish. Cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener operation; carries full surge current during clamping |
| Cathode | Breakdown voltage reference terminal | Marked with band; connected to regulated output or feedback point; defines Zener voltage polarity |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal voids to prevent moisture ingress and long-term parameter drift in humid or vacuum environments |
| Category I metallurgical bond | Ensures mechanical integrity and thermal cycle survivability up to 1000 cycles between –65 °C and +175 °C |
| MIL-PRF-19500/356 JANTXV qualification | Meets screening requirements for space-level reliability including burn-in, temperature cycling, and radiation testing |
| Nonsensitive to ESD | Withstands ≥4 kV HBM per MIL-STD-750 Method 1020 without parameter shift or failure |
| Inherent radiation hardness | Qualified per Microsemi MicroNote 050 for total ionizing dose (TID) tolerance up to 100 krad(Si) |
Applications
| Aerospace Power Bus Protection | Downhole Instrumentation Reference |
|---|---|
Use Scenario: Clamping transient spikes on 28 V or 70 V DC power buses in satellite power distribution units. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to limit bus voltage excursion during load dump or lightning-induced surges. Use Value: 5 W power rating and 2.0 A 8.3 ms surge capability enable single-device protection without external heat sinking. | Use Scenario: Providing stable 75 V reference for pressure sensor excitation in oil/gas well logging tools operating at 175 °C ambient. IC Role / Device Role / Timing Role: Precision voltage reference element in ratiometric bridge excitation circuitry. Use Value: ±2% tolerance and +0.100 %/°C TC ensure <±0.5% total error over full temperature range without calibration. |
| Military Avionics Voltage Regulation | Radiation-Hardened Sensor Interface |
Use Scenario: Regulating auxiliary 75 V supply for RF front-end biasing in airborne radar receivers. IC Role / Device Role / Timing Role: Shunt regulator maintaining constant voltage despite input ripple and load variation. Use Value: 55 Ω dynamic impedance and –65 °C to +175 °C operation support stable regulation under vibration and extreme thermal gradients. | Use Scenario: Overvoltage protection for analog front-ends in nuclear reactor monitoring systems exposed to gamma radiation. IC Role / Device Role / Timing Role: Radiation-hardened clamping diode safeguarding ADC inputs against EMI-induced transients. Use Value: Inherent TID hardness and 2 μA leakage at 56 V preserve signal integrity and minimize false triggers in safety-critical sensing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4979US/TR | Same 75 V nominal voltage but ±5% tolerance (no C suffix); higher leakage (≤5 μA @ 56 V) | Suitable for non-critical regulation where tighter tolerance is not required | Select when cost sensitivity outweighs precision needs and system-level calibration compensates for tolerance |
| JANS1N4979CUS/TR | Same 75 V ±2%, but JANS grade with enhanced screening (including neutron irradiation) and wider lot traceability | Required for Class S (mission-critical space) applications per MIL-PRF-19500/356 | Choose when full JANS certification, extended radiation testing, or NASA/GSFC approval is mandated |
Compared with JANTXV1N4979US/TR and JANS1N4979CUS/TR, the JANTXV1N4979CUS/TR provides optimal balance of precision, reliability, and qualification scope for Class V space programs and high-end military platforms - offering tighter tolerance than the standard JANTXV variant while avoiding the cost and lead-time premium of JANS-grade screening.
Availability
JANTXV1N4979CUS/TR is available at Aetrix Electronics and suitable for aerospace power bus protection, downhole instrumentation reference, and military avionics voltage regulation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for JANTXV1N4979CUS/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 defense, aerospace, and industrial markets.
The JANTXV1N4979CUS/TR belongs to Microsemi's legacy 1N49xxUS Zener family, engineered specifically for military- and space-grade voltage regulation where hermeticity, radiation tolerance, and extreme temperature performance are non-negotiable.
FAQ
What is the Zener voltage tolerance of JANTXV1N4979CUS/TR?
The JANTXV1N4979CUS/TR has a nominal Zener voltage of 75 V with a tolerance of ±2%, denoted by the "C" suffix in the part number. This tighter tolerance is verified per MIL-PRF-19500/356 screening and supports precision regulation in feedback networks where voltage accuracy directly impacts system performance. The JANTXV1N4979CUS/TR achieves this specification at 20 mA test current and 25 °C ambient.
Is JANTXV1N4979CUS/TR suitable for space applications?
Yes, the JANTXV1N4979CUS/TR is qualified to MIL-PRF-19500/356 Class V (JANTXV grade), which includes rigorous screening for space-level reliability such as temperature cycling, burn-in, and radiation hardness assurance. Its voidless-glass hermetic seal and Category I metallurgical bond make the JANTXV1N4979CUS/TR appropriate for LEO and GEO satellite power and sensor subsystems.
What is the maximum continuous Zener current for JANTXV1N4979CUS/TR?
The maximum continuous Zener current (IZM) for JANTXV1N4979CUS/TR is 630 mA, calculated from its 5 W power rating and 75 V nominal Zener voltage (P = V × I). This value assumes operation at TEC = 140 °C; derating is linear above that temperature to zero at +175 °C. The JANTXV1N4979CUS/TR maintains regulation stability across this full current range.
Does JANTXV1N4979CUS/TR have radiation hardness certification?
Yes, the JANTXV1N4979CUS/TR exhibits inherent radiation hardness documented in Microsemi MicroNote 050, with total ionizing dose (TID) tolerance up to 100 krad(Si). This characteristic is intrinsic to its voidless-glass construction and metallurgical bonding - no additional processing is required. The JANTXV1N4979CUS/TR is routinely deployed in nuclear instrumentation and space electronics where radiation-induced parametric shift must be minimized.
What package type does JANTXV1N4979CUS/TR use?
The JANTXV1N4979CUS/TR uses the "E" package (also designated "D-5B"), a surface-mount hermetically sealed voidless glass case with tungsten slugs and copper end caps finished with Sn/Pb. Its cathode is marked by a visible band, and it complies with EIA-481-B tape-and-reel packaging standards. The JANTXV1N4979CUS/TR requires no adhesive mounting - solder alone provides mechanical and thermal integrity.
JANTXV1N4979CUS/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:
- ±2%
- 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
JANTXV1N4979CUS/TR FAQ
1.How can I place an order for JANTXV1N4979CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTXV1N4979CUS/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 JANTXV1N4979CUS/TR reliable?
The price and inventory of JANTXV1N4979CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTXV1N4979CUS/TR is usually 5 days.
3.What payment methods are accepted for JANTXV1N4979CUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTXV1N4979CUS/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANTXV1N4979CUS/TR?
JANTXV1N4979CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTXV1N4979CUS/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 JANTXV1N4979CUS/TR?
For technical support, including JANTXV1N4979CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTXV1N4979CUS/TR requirements.
6.How does Aetrix verify that JANTXV1N4979CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTXV1N4979CUS/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 JANTXV1N4979CUS/TR meets industry standards.
7.What is the process for return or replacement of JANTXV1N4979CUS/TR?
All JANTXV1N4979CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTXV1N4979CUS/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 JANTXV1N4979CUS/TR part is unused and in its original packaging.
Return procedure for JANTXV1N4979CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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