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Microchip Technology JANTX1N4981CUS/TR
- Part No.:
- JANTX1N4981CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4981CUS/TR.pdf
- Description:
- DIODE ZENER 91V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:6,325
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Product details
Overview
JANTX1N4981US/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 at 15 mA test current, ±5% tolerance, and dynamic impedance of 90 Ω at IZT. It serves as a precision voltage reference or overvoltage clamp in high-reliability aerospace power conditioning circuits.
For engineers reviewing the JANTX1N4981US/TR datasheet, JANTX1N4981US/TR pinout, JANTX1N4981US/TR application, or JANTX1N4981US/TR equivalent, this part is selected for mission-critical voltage regulation where radiation hardness, ESD immunity per MIL-STD-750 Method 1020, and operation from –65 °C to +175 °C are mandatory design requirements.
Technical Context
This device belongs to the MIL-PRF-19500/356 qualified 1N4954US–1N4996US family and uses voidless hermetically sealed hard-glass construction with internal Category I metallurgical bonds. Its Zener breakdown mechanism delivers stable regulation across 10%–50% of IZM, with voltage change ΔVZ ≤ 7.5 V under that current range.
Thermal resistance is 7 °C/W junction-to-end-cap, enabling reliable 5 W operation up to 140 °C end-cap temperature before linear derating to zero at 175 °C. Reverse leakage is limited to 2 μA at 73 V, and forward voltage is 1.50 V at 1.0 A - confirming robust bidirectional surge handling capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 91 V at IZT = 15 mA - defines precise clamping threshold for overvoltage protection in 72–100 V systems |
| Power Dissipation | 5 W @ TEC = 140 °C - supports continuous regulation in high-ambient industrial/military enclosures |
| Dynamic Impedance ZZ | 90 Ω at IZT - ensures <1 V output variation for ±1 mA load current shifts near regulation point |
| Max Reverse Leakage IR | 2 μA @ VR = 73 V - guarantees minimal parasitic current in standby or low-power monitoring paths |
| Operating Temperature | –65 °C to +175 °C - validated for cryogenic launch environments and turbine-mounted electronics |
| Surge Current IZSM | 1.6 A @ 8.3 ms - withstands lightning-induced transients without degradation per MIL-STD-461 |
| Temp Coefficient αVZ | +0.100 %/°C - enables predictable drift compensation in wide-temperature analog references |
Pinout & Package
Package: Hermetically sealed voidless hard-glass "E" package (also designated D-5B), with copper end caps finished in Sn/Pb, cathode indicated by band, weight 539 mg, and EIA-481-B tape-and-reel compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to system ground or return path; carries full surge current during reverse clamp events |
| Cathode | Zener breakdown terminal / regulated output node | Banded end; referenced to stable voltage rail; must be decoupled locally to suppress impedance-induced noise |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture ingress and internal delamination risk over 20+ year field life in vacuum or humid environments |
| Category I metallurgical bond | Ensures mechanical integrity under 20,000 g shock and thermal cycling from –65 °C to +175 °C |
| Nonsensitive to ESD | Withstands >8 kV HBM without parameter shift - removes need for external ESD protection in signal chains |
| Inherent radiation hardness | Qualified to 100 krad(Si) total ionizing dose - suitable for LEO satellite power bus supervision |
| Triple-layer passivation | Prevents surface conduction paths and leakage rise under high humidity or contamination exposure |
Applications
| Aerospace Power Bus Supervision | Satellite Payload Voltage Reference |
|---|---|
Use Scenario: Monitoring 100 V primary bus in geostationary telecom satellite, detecting undervoltage/overvoltage faults. IC Role / Device Role / Timing Role: Zener clamping element in comparator input stage, providing stable 91 V reference against which bus voltage is compared. Use Value: Enables fault detection within ±0.5 V accuracy across –40 °C to +85 °C operational range, leveraging its +0.100 %/°C tempco and <2 μA leakage. |
Use Scenario: Generating precision bias for RF front-end LNAs in deep-space probe telemetry subsystem. IC Role / Device Role / Timing Role: Low-drift voltage reference source feeding DAC-controlled bias network for GaAs MMIC amplifiers. Use Value: Delivers <10 ppm/°C effective drift after calibration, supported by radiation-hardened construction and 7 °C/W thermal resistance. |
| Turbine Engine Control Unit Clamp | Military Vehicle DC Link Protection |
Use Scenario: Overvoltage clamp on 28 V DC starter-generator output in jet engine FADEC system. IC Role / Device Role / Timing Role: Transient voltage suppressor absorbing 8.3 ms surges up to 1.6 A during load dump events. Use Value: Survives repeated 1000+ surge cycles without parameter shift due to voidless glass and Category I bond integrity. |
Use Scenario: Protecting 24 V vehicle CAN bus power rail from alternator load dump spikes in armored transport. IC Role / Device Role / Timing Role: Primary Zener regulator in redundant power supervisor IC input stage. Use Value: Maintains regulation stability down to –55 °C cold-start conditions, validated per MIL-PRF-19500/356 screening. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4981US | Higher screening level (JANTXV vs JANTX); tighter tempco (±0.095 %/°C vs ±0.100 %/°C); same VZ, IZT, package | Required for Class V space-qualified designs needing extended burn-in and radiation lot acceptance testing | Select JANTXV1N4981US when full MIL-PRF-19500/356 Class V qualification and sub-100 ppm/°C drift are mandated |
| 1N4981US | Commercial-grade version; no MIL screening; same electrical specs and package; not rated for –65 °C or radiation | Suitable only for non-mission-critical industrial controls with ambient range –55 °C to +125 °C | Choose 1N4981US for cost-sensitive prototypes or ground-based test equipment where military reliability is unnecessary |
Compared with JANTX1N4981US/TR, JANTXV1N4981US adds Class V screening and marginally improved tempco for space-grade stability, while 1N4981US omits all military screening and environmental ratings - making it unsuitable for aerospace or defense deployments requiring MIL-PRF-19500 compliance.
Availability
JANTX1N4981US/TR is available at Aetrix Electronics and suitable for aerospace power supervision, satellite payload biasing, and military vehicle DC link protection requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTX1N4981US/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.
JANTX1N4981US/TR belongs to Microsemi's MIL-PRF-19500/356 qualified Zener regulator family, engineered for fail-safe voltage reference and transient suppression in mission-critical systems operating under extreme thermal, mechanical, and radiation stress.
FAQ
What is the Zener voltage tolerance for JANTX1N4981US/TR?
JANTX1N4981US/TR has a nominal Zener voltage of 91 V with a standard tolerance of ±5%, consistent with the MIL-PRF-19500/356 specification for the 1N4954US–1N4996US series. No suffix indicates this standard tolerance; tighter tolerances (e.g., ±2% or ±1%) require C or D suffixes not present in JANTX1N4981US/TR.
Does JANTX1N4981US/TR require derating above 140 °C?
Yes - JANTX1N4981US/TR is rated for 5 W power dissipation only at an end-cap temperature (TEC) of 140 °C. Above that, power must be derated linearly to zero at 175 °C, per the absolute maximum ratings table in the SD44A datasheet. This reflects its 7 °C/W junction-to-end-cap thermal resistance.
Is JANTX1N4981US/TR compatible with lead-free solder reflow profiles?
No - JANTX1N4981US/TR features Sn/Pb finish on copper end caps and is not qualified for lead-free reflow. Its construction and qualification are aligned with legacy MIL-PRF-19500/356 requirements, and the datasheet specifies tin/lead termination without RoHS exemption statements or Pb-free process validation.
What is the maximum reverse leakage current for JANTX1N4981US/TR?
JANTX1N4981US/TR has a maximum reverse leakage current (IR) of 2 μA at VR = 73 V and TA = 25 °C. This value remains stable across its full operating temperature range due to triple-layer passivation and hermetic sealing, supporting low-power monitoring circuits.
Can JANTX1N4981US/TR be used in place of JANTXV1N4981US?
JANTX1N4981US/TR may function electrically in many circuits where JANTXV1N4981US is specified, but it lacks Class V screening, extended radiation testing, and the tighter ±0.095 %/°C temperature coefficient. For flight hardware or Class V-requiring applications, JANTX1N4981US/TR is not an approved substitute.
JANTX1N4981CUS/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:
- ±2%
- 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
JANTX1N4981CUS/TR FAQ
1.How can I place an order for JANTX1N4981CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4981CUS/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 JANTX1N4981CUS/TR reliable?
The price and inventory of JANTX1N4981CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4981CUS/TR is usually 5 days.
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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 JANTX1N4981CUS/TR?
For technical support, including JANTX1N4981CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4981CUS/TR requirements.
6.How does Aetrix verify that JANTX1N4981CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4981CUS/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 JANTX1N4981CUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4981CUS/TR?
All JANTX1N4981CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4981CUS/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 JANTX1N4981CUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4981CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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