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Microchip Technology JANTX1N4979CUS/TR
- Part No.:
- JANTX1N4979CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4979CUS/TR.pdf
- Description:
- DIODE ZENER 75V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:9,398
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Product details
Overview
JANTX1N4979CUS/TR from Microsemi is a military-qualified, voidless hermetically sealed surface-mount Zener diode rated for 5 W power dissipation at TEC = 125 °C, with nominal Zener voltage of 75 V ±1% (C suffix), dynamic impedance of 55 Ω at 20 mA, 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 JANTX1N4979CUS/TR datasheet, JANTX1N4979CUS/TR pinout, JANTX1N4979CUS/TR application, or JANTX1N4979CUS/TR equivalent, this part is selected for mission-critical voltage regulation where radiation hardness, ESD immunity per MIL-STD-750 Method 1020, and stable Zener voltage across wide current/temperature ranges are mandatory design requirements.
Technical Context
This device belongs to the 1N4954US–1N4996US family, fabricated using voidless hard-glass hermetic construction with internal Category I metallurgical bonds. Its Zener breakdown mechanism delivers tight regulation (ΔVZ ≤ 0.6 V between 10% and 50% of IZM) and low temperature coefficient (αVZ = +0.100 %/°C) at IZT = 20 mA.
The "C" suffix denotes ±1% tolerance on nominal VZ = 75 V, verified at IZT = 20 mA; forward voltage is specified as 1.50 V at 1.0 A, and reverse leakage is limited to 2 μA at VR = 60 V. Thermal resistance is 10 °C/W junction-to-end-cap, supporting operation up to 175 °C with linear derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 75 V ±1% at 20 mA - enables precise voltage clamping in 72–80 V rail protection schemes |
| Power Dissipation | 5 W @ TEC = 125 °C - supports sustained regulation under high ambient thermal load without forced cooling |
| Dynamic Impedance | 55 Ω at IZT = 20 mA - ensures minimal output voltage variation under dynamic load transients |
| Max Reverse Leakage | 2 μA at VR = 60 V - guarantees negligible standby current in high-impedance bias networks |
| Temp Coefficient | +0.100 %/°C at IZT = 20 mA - provides predictable, monotonic VZ drift for temperature-compensated references |
| Surge Current | 2.0 A @ 8.3 ms - withstands transient overvoltage events such as lightning-induced surges in avionics interfaces |
| Operating Temp | –65 °C to +175 °C - qualified for extended-range deployment in satellite power systems and jet engine controllers |
Pinout & Package
Package: Hermetically sealed voidless hard-glass case with tungsten slugs, "E" outline (also designated D-5B), surface-mount configuration. End caps are copper with Sn/Pb finish; cathode indicated by band. Weight: 539 mg. Tape & reel compliant with EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node during regulation; must handle 1.0 A forward surge per spec |
| Cathode | Zener breakdown terminal | Marked with band; connected to regulated voltage rail; carries full Zener current during clamping |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal delamination risk under thermal cycling and vacuum exposure in space-grade assemblies |
| Category I metallurgical bond | Ensures mechanical integrity and long-term reliability under shock/vibration in flight control electronics |
| MIL-PRF-19500/356 qualification (JANTX) | Validates compliance with military screening including burn-in, temperature cycling, and lot acceptance testing |
| Radiation hardness (MicroNote 050) | Supports operation in total ionizing dose (TID) environments up to 100 krad(Si) without parameter shift |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Withstands >4 kV HBM without degradation-critical for handling in cleanroom assembly lines |
Applications
| Aerospace Power Bus Protection | Satellite Voltage Reference |
|---|---|
|
Use Scenario: Clamping transient overvoltages on 72 V primary bus in launch vehicle power distribution units. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator and crowbar element during fault conditions. Use Value: Withstands 2.0 A 8.3 ms surge and maintains <0.6 V regulation delta across –55 °C to +125 °C, preventing downstream converter latch-up. |
Use Scenario: Providing stable 75 V reference for telemetry ADC biasing in LEO satellite payload modules. IC Role / Device Role / Timing Role: Precision voltage reference source with ±1% tolerance and +0.100 %/°C TC. Use Value: Delivers <2 μA leakage at 60 V and radiation-hardened performance per MicroNote 050, ensuring data integrity over 15-year mission life. |
| Avionics Engine Control Unit | Tactical Radio RF Stage Bias |
|
Use Scenario: Regulating auxiliary 75 V supply for FADEC sensor signal conditioning in turbine engine controllers. IC Role / Device Role / Timing Role: High-temperature-stable Zener reference enabling accurate analog front-end calibration. Use Value: Operates continuously from –65 °C to +175 °C with 10 °C/W thermal resistance, eliminating need for external heatsinking in compact enclosures. |
Use Scenario: Setting bias point for GaN PA stages in manpack tactical radios requiring stable 75 V drain supply. IC Role / Device Role / Timing Role: Voltage clamp protecting amplifier gate drivers from supply rail overshoot. Use Value: 55 Ω dynamic impedance minimizes VZ perturbation during RF burst transmission, preserving linearity and spectral purity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4979CUS/TR | Higher screening level (JANTXV vs JANTX); tighter parametric limits on leakage and temp coefficient | Required for Class S (space-qualified) programs demanding zero defects and extended life validation | Select when full MIL-PRF-19500/356 Class V screening and enhanced lot traceability are mandated |
| 1N4979CUS/TR (non-JANTX) | No military screening; commercial temperature range (–65 °C to +150 °C); no radiation hardness documentation | Suitable for industrial test equipment or non-safety-critical instrumentation where cost drives selection | Choose only for ground-based prototypes or non-mission-critical subsystems with relaxed reliability requirements |
Compared with JANTX1N4979CUS/TR, JANTXV1N4979CUS/TR adds Class V screening for space use, while 1N4979CUS/TR omits military qualification entirely-making the JANTX variant the optimal balance of assured reliability and procurement availability for defense avionics.
Availability
JANTX1N4979CUS/TR is available at Aetrix Electronics and suitable for aerospace power bus protection, satellite voltage reference, and avionics engine control unit designs requiring stable component supply, full traceability, and long-term obsolescence management.
Supply support for JANTX1N4979CUS/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 JANTX1N4979CUS/TR belongs to Microsemi's legacy MIL-PRF-19500/356 qualified Zener diode product line, engineered specifically for voltage regulation and transient suppression in mission-critical electronic systems operating under extreme environmental stress.
FAQ
What is the Zener voltage tolerance for JANTX1N4979CUS/TR?
JANTX1N4979CUS/TR has a nominal Zener voltage of 75 V with ±1% tolerance, denoted by the "C" suffix in the part number. This tolerance is guaranteed at the test current IZT = 20 mA and is validated per MIL-PRF-19500/356 screening requirements. The JANTX1N4979CUS/TR achieves this tight tolerance via post-trim characterization and lot-level statistical process control.
Does JANTX1N4979CUS/TR require a heatsink in standard PCB mounting?
JANTX1N4979CUS/TR does not require an external heatsink when operated at ≤5 W within its specified thermal envelope: it is rated for 5 W at TEC = 125 °C with 10 °C/W junction-to-end-cap thermal resistance. Standard FR-4 PCB with ≥1 oz copper and adequate pad area suffices for most avionics applications; derating begins linearly above 125 °C end-cap temperature.
Is JANTX1N4979CUS/TR radiation hardened?
Yes, JANTX1N4979CUS/TR is inherently radiation hard per Microsemi MicroNote 050, which documents its performance under total ionizing dose (TID) exposure. The voidless hermetic glass package and Category I metallurgical bond contribute to its resilience, making JANTX1N4979CUS/TR suitable for low-earth orbit satellite power systems without additional shielding.
What is the maximum reverse leakage current for JANTX1N4979CUS/TR?
The maximum reverse leakage current for JANTX1N4979CUS/TR is 2 μA at VR = 60 V and TA = 25 °C, as specified in the Electrical Characteristics table. This low leakage ensures minimal power loss in high-impedance bias networks and preserves accuracy in precision reference applications where JANTX1N4979CUS/TR is deployed.
How is polarity identified on JANTX1N4979CUS/TR?
Polarity on JANTX1N4979CUS/TR is indicated by a visible cathode band on the glass body - the banded end is the cathode terminal. This marking aligns with JEDEC standard orientation for surface-mount Zener diodes and must be observed during PCB layout to ensure correct circuit connection; reverse installation will prevent proper Zener breakdown operation.
JANTX1N4979CUS/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
JANTX1N4979CUS/TR FAQ
1.How can I place an order for JANTX1N4979CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4979CUS/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 JANTX1N4979CUS/TR reliable?
The price and inventory of JANTX1N4979CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4979CUS/TR is usually 5 days.
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Once your JANTX1N4979CUS/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 JANTX1N4979CUS/TR?
For technical support, including JANTX1N4979CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4979CUS/TR requirements.
6.How does Aetrix verify that JANTX1N4979CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4979CUS/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 JANTX1N4979CUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4979CUS/TR?
All JANTX1N4979CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4979CUS/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 JANTX1N4979CUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4979CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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