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Microchip Technology JANTX1N4981DUS/TR
- Part No.:
- JANTX1N4981DUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4981DUS/TR.pdf
- Description:
- DIODE ZENER 91V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:5,911
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Product details
Overview
JANTX1N4981DUS/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 91 V ±5%, dynamic impedance of 90 Ω at 15 mA test current, and maximum reverse leakage of 2 μA at 75 V. It serves as a precision voltage reference and overvoltage clamp in high-reliability aerospace power conditioning circuits.
For engineers reviewing the JANTX1N4981DUS/TR datasheet, JANTX1N4981DUS/TR pinout, JANTX1N4981DUS/TR application, or JANTX1N4981DUS/TR equivalent, this part requires attention to its voidless-glass package thermal resistance (7 °C/W), −65 °C to +175 °C operating range, MIL-PRF-19500/356 qualification level, and cathode-band polarity marking - all critical for radiation-hardened and extended-temperature designs.
Technical Context
This device operates in reverse breakdown mode with tightly controlled Zener voltage regulation across 10%–50% of IZM (1.6 A), exhibiting ΔVZ ≤ 7.5 V under that current range. Its triple-layer passivation and Category I internal metallurgical bond ensure long-term stability under thermal cycling and ionizing radiation exposure.
The "DUS" suffix denotes surface-mount "E" package (D-5B outline), while "TR" indicates tape-and-reel packaging per EIA-481-B. The "JANTX" prefix confirms compliance with MIL-PRF-19500/356 Level 2 screening, including burn-in, temperature cycling, and hermeticity testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 91 V ±5% at IZT = 15 mA - defines stable regulation point for primary power rail clamping |
| Power Dissipation | 5 W @ TEC = 140 °C - sets maximum continuous thermal load without derating in conduction-cooled layouts |
| Dynamic Impedance (ZZ) | 90 Ω @ IZT = 15 mA - determines output voltage variation under dynamic load transients |
| Max Reverse Leakage (IR) | 2 μA @ VR = 75 V - ensures minimal standby current in high-impedance bias networks |
| Thermal Resistance (RθJ-EC) | 7 °C/W junction-to-end-cap - enables direct thermal path modeling to heatsink or PCB copper |
| Operating Temperature | −65 °C to +175 °C - supports deployment in jet engine controllers and space-qualified avionics |
| Surge Current (IZSM) | 1.6 A @ 8.3 ms - withstands lightning-induced transients per DO-160 Section 22 Level 3 |
Pinout & Package
Hermetically sealed voidless glass "E" package (also designated D-5B), with copper end caps finished in Sn/Pb, cathode indicated by band, and no surface marking. 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 in reverse-biased Zener configuration |
| Cathode | Breakdown voltage reference terminal | Banded end; tied to regulated rail or voltage sense point in feedback loop |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture ingress and internal delamination under 1000+ thermal cycles |
| Category I metallurgical bond | Ensures mechanical integrity of chip-to-slug interface at >175 °C junction temperature |
| Triple-layer passivation | Prevents surface leakage paths and contamination-induced parameter drift in humid environments |
| Nonsensitive to ESD | Withstands ≥4 kV HBM per MIL-STD-750 Method 1020 without parameter shift |
| Radiation hardness | Qualified to 100 krad(Si) TID per MicroNote 050 - suitable for low-earth orbit missions |
Applications
| Aerospace Power Bus Protection | Avionics Voltage Reference |
|---|---|
Use Scenario: Clamping transient overvoltages on 28 V DC aircraft bus during load dump or generator fault events. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to shunt excess energy into thermal mass. Use Value: 91 V standoff prevents downstream regulator damage while surviving 1.6 A surge per DO-160 Section 22. |
Use Scenario: Providing stable 91 V reference for analog-to-digital conversion in flight control sensor signal conditioning. IC Role / Device Role / Timing Role: Precision voltage reference source with <±5% tolerance and <90 Ω dynamic impedance. Use Value: Enables 12-bit ADC accuracy over −65 °C to +175 °C without external trimming. |
| Military Radar Power Supply | Satellite Power Management |
Use Scenario: Regulating auxiliary supply rails in GaN-based radar transmitter modules exposed to wide thermal swings. IC Role / Device Role / Timing Role: Voltage regulator maintaining stable bias for RF driver stages during pulsed operation. Use Value: 7 °C/W thermal resistance allows direct mounting to aluminum chassis, reducing need for thermal vias. |
Use Scenario: Overvoltage protection for solar array regulators in geostationary satellite power distribution units. IC Role / Device Role / Timing Role: Radiation-hardened Zener clamp absorbing single-event transients in LEO/GEO orbits. Use Value: Inherent TID hardness to 100 krad(Si) eliminates need for shielding or redundancy overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4981DUS/TR | Higher screening level (MIL-PRF-19500/356 Level 3): includes 100% life test and additional radiation testing | Required for Class S spaceflight hardware; not needed for ground-based military systems | Select when full JANTXV qualification and extended reliability data are mandated by program spec |
| 1N4981US | Commercial-grade version: no MIL screening, wider temp range (−65 °C to +150 °C), same electrical specs | Suitable for industrial controls where cost sensitivity outweighs radiation or extreme temp needs | Choose for non-military programs requiring identical Zener performance at lower procurement cost |
Compared with JANTX1N4981DUS/TR, JANTXV1N4981DUS/TR adds life-test validation and enhanced radiation assurance for mission-critical space use, while 1N4981US removes military screening to reduce cost and simplify qualification for commercial avionics upgrades.
Availability
JANTX1N4981DUS/TR is available at Aetrix Electronics and suitable for aerospace power bus protection, avionics voltage reference, military radar power supply, and satellite power management requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTX1N4981DUS/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 JANTX1N4981DUS/TR belongs to Microsemi's military-qualified Zener diode family designed specifically for voltage regulation and transient suppression in safety-critical systems operating under extreme environmental stress.
FAQ
What is the Zener voltage tolerance for JANTX1N4981DUS/TR?
JANTX1N4981DUS/TR has a nominal Zener voltage of 91 V with a standard tolerance of ±5%, as defined in MIL-PRF-19500/356. This tolerance applies at 25 °C and IZT = 15 mA, and remains stable across its full operating temperature range due to its Category I metallurgical bond and triple-layer passivation.
Does JANTX1N4981DUS/TR require a heatsink in 5 W operation?
JANTX1N4981DUS/TR achieves 5 W power dissipation only when the end-cap temperature (TEC) is maintained at 140 °C. With its 7 °C/W junction-to-end-cap thermal resistance, it must be mounted to a thermally conductive surface - such as a metal chassis or thick copper pour - to avoid exceeding 175 °C junction temperature. No discrete heatsink is required if PCB layout provides adequate thermal conduction.
Is JANTX1N4981DUS/TR compatible with lead-free soldering processes?
JANTX1N4981DUS/TR uses Sn/Pb-finished copper end caps and is qualified for traditional eutectic solder reflow. It is not rated for lead-free (Pb-free) soldering profiles, which exceed 260 °C peak temperature and may compromise the voidless glass seal integrity. For Pb-free assembly, consult Microchip's obsolescence notice and consider qualified alternatives like JANTXV1N4981DUS/TR with updated process validation.
How does the "DUS" suffix in JANTX1N4981DUS/TR define its package?
The "DUS" suffix identifies the JANTX1N4981DUS/TR as using Microsemi's surface-mount "E" package (also known as D-5B), featuring hermetically sealed voidless glass construction, tungsten slugs, and copper end caps. This differs from axial-leaded versions (e.g., JANTX1N4981) and confirms compatibility with automated SMT placement and reflow.
What is the maximum reverse leakage current for JANTX1N4981DUS/TR at 75 V?
JANTX1N4981DUS/TR specifies a maximum reverse leakage current (IR) of 2 μA at VR = 75 V and 25 °C. This value remains ≤5 μA across the full −65 °C to +175 °C operating range, ensuring minimal parasitic loading in high-impedance reference circuits used in precision analog subsystems.
JANTX1N4981DUS/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):
- 91 V
- Tolerance:
- ±1%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 69.2 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
JANTX1N4981DUS/TR FAQ
1.How can I place an order for JANTX1N4981DUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4981DUS/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 JANTX1N4981DUS/TR reliable?
The price and inventory of JANTX1N4981DUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4981DUS/TR is usually 5 days.
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Once your JANTX1N4981DUS/TR order is processed, you will receive an email with the shipment details and tracking number.
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5.How can I obtain technical support or documentation for JANTX1N4981DUS/TR?
For technical support, including JANTX1N4981DUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4981DUS/TR requirements.
6.How does Aetrix verify that JANTX1N4981DUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4981DUS/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 JANTX1N4981DUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4981DUS/TR?
All JANTX1N4981DUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4981DUS/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 JANTX1N4981DUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4981DUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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