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Microchip Technology JANTX1N4987US/TR
- Part No.:
- JANTX1N4987US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4987US/TR.pdf
- Description:
- DIODE ZENER 160V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:2,816
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Product details
Overview
JANTX1N4987US/TR from Microsemi is a military-qualified, hermetically sealed surface-mount Zener diode rated for 5 W power dissipation at 140 °C end-cap temperature, with a nominal Zener voltage of 160 V ±5%, dynamic impedance of 350 Ω at 8 mA test current, and operating junction temperature range of −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 JANTX1N4987US/TR datasheet, JANTX1N4987US/TR pinout, JANTX1N4987US/TR application, or JANTX1N4987US/TR equivalent, this page delivers verified electrical parameters, MIL-PRF-19500/356 qualification status, thermal resistance (7 °C/W), surge current rating (1.4 A @ 8.3 ms), and hermetic glass package construction details critical for radiation-hardened and extended-temperature designs.
Technical Context
This device belongs to the JANTX-grade 1N4954US–1N4996US series, featuring voidless hermetically sealed hard-glass construction with internal Category I metallurgical bonds and triple-layer passivation. It operates as a two-terminal voltage regulator with cathode-banded polarity and exhibits stable breakdown behavior across −65 °C to +175 °C.
Its regulation performance is defined by ΔVZ ≤14 V between 10% and 50% of IZM, reverse leakage IR ≤2 μA at VR = 121.6 V, and forward voltage VF ≤1.5 V at 1.0 A - all specified per MIL-PRF-19500/356 test methods.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 160 V ±5% at IZT = 8 mA - defines stable regulation point for high-voltage biasing and clamping |
| Power Dissipation | 5 W @ TEC = 140 °C - requires heatsinking or board thermal design above 140 °C ambient |
| Dynamic Impedance ZZT | 350 Ω @ IZT = 8 mA - determines output voltage variation under load transients |
| Max Reverse Leakage IR | 2 μA @ VR = 121.6 V - ensures low standby power loss in high-impedance sensing paths |
| Surge Current IZSM | 1.4 A @ 8.3 ms half-sine - supports transient overvoltage suppression without failure |
| Junction Temp Range | −65 °C to +175 °C - enables operation in space, downhole, and jet engine control environments |
| Thermal Resistance θJC | 7 °C/W junction-to-end-cap - informs thermal interface material selection and pad copper area |
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 | Connected to lower-potential node in reverse-biased Zener configuration |
| Cathode | Breakdown terminal | Banded end; connected to higher-potential node to enable Zener conduction and voltage regulation |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/356 Qualified | JANTX grade confirms screening for vibration, shock, temperature cycling, and burn-in per military standard |
| Voidless Hermetic Seal | Eliminates moisture ingress and long-term parameter drift in humid or corrosive environments |
| Category I Metallurgical Bond | Ensures mechanical integrity and thermal stability under extreme thermal cycling stress |
| Nonsensitive to ESD | Withstands >4 kV HBM per MIL-STD-750 Method 1020 without parameter shift or failure |
| Radiation Hardness | Inherently tolerant to total ionizing dose (TID) per MicroNote 050 - suitable for space applications |
Applications
| Aerospace Power Bus Protection | Satellite Voltage Reference |
|---|---|
|
Use Scenario: Clamping transient spikes on 100–200 V DC power buses in satellite power distribution units. IC Role / Device Role / Timing Role: Two-terminal passive Zener clamp absorbing energy during load dump or lightning-induced surges. Use Value: Withstands 1.4 A surge @ 8.3 ms and maintains regulation within ±5% across −65 °C to +175 °C, preventing downstream converter damage. |
Use Scenario: Providing stable 160 V reference for high-voltage sensor biasing in Earth observation instrument front-ends. IC Role / Device Role / Timing Role: Precision Zener reference element in ratiometric measurement chains requiring long-term stability. Use Value: 350 Ω dynamic impedance and <2 μA leakage at 121.6 V ensure minimal loading error and drift in high-impedance feedback networks. |
| Downhole Telemetry Power Regulation | Jet Engine Control Module Clamp |
|
Use Scenario: Regulating auxiliary supply rails in oil/gas logging tools exposed to 175 °C wellbore temperatures. IC Role / Device Role / Timing Role: High-temperature-stable Zener shunt regulator maintaining bias voltage for analog signal conditioners. Use Value: Guaranteed operation up to +175 °C with 7 °C/W thermal resistance enables direct mounting on thermally conductive substrates without derating. |
Use Scenario: Protecting FPGA I/O banks from induced transients in FADEC modules operating near turbine hot sections. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp placed at board-level input filters. Use Value: Voidless glass construction and Category I bond prevent microcrack formation during repeated thermal shock cycles from engine start-stop events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4987US | Higher screening level (JANTXV vs. JANTX); tighter parametric limits on ΔVZ and IR | Required for mission-critical flight control systems where parameter margin is mandated | Select JANTXV1N4987US when full MIL-PRF-19500/356 Class V screening is specified in the BOM |
| 1N4987US | Commercial-grade version; no MIL screening, wider IR and ΔVZ tolerances, non-hermetic packaging option | Suitable for ground-test equipment or non-flight prototypes where cost and lead time dominate | Choose 1N4987US only for development labs or non-mission hardware with relaxed reliability requirements |
Compared with JANTX1N4987US/TR, JANTXV1N4987US offers enhanced screening confidence for flight hardware, while 1N4987US reduces cost and procurement time for non-qualified use - neither is pin-compatible with axial-leaded variants due to D-5B surface-mount geometry.
Availability
JANTX1N4987US/TR is available at Aetrix Electronics and suitable for aerospace power bus protection, satellite voltage reference, and downhole telemetry power regulation requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTX1N4987US/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 JANTX1N4987US/TR belongs to Microsemi's legacy MIL-PRF-19500/356 qualified Zener diode family, engineered for voltage regulation and transient suppression in mission-critical systems where hermeticity and radiation tolerance are mandatory.
FAQ
What is the Zener voltage tolerance for JANTX1N4987US/TR?
JANTX1N4987US/TR has a nominal Zener voltage of 160 V with a standard tolerance of ±5%, as defined in MIL-PRF-19500/356. This tolerance applies under specified test conditions (IZT = 8 mA, TJ = 25 °C) and remains valid across the full operating temperature range of −65 °C to +175 °C for the JANTX grade.
Is JANTX1N4987US/TR suitable for space applications?
Yes, JANTX1N4987US/TR is inherently radiation-hardened per Microsemi MicroNote 050 and qualified to MIL-PRF-19500/356, making it suitable for low-Earth orbit and deep-space missions. Its voidless hermetic glass package and Category I metallurgical bond prevent parameter degradation under total ionizing dose exposure.
What is the maximum continuous Zener current for JANTX1N4987US/TR?
The maximum continuous Zener current IZM for JANTX1N4987US/TR is 930 mA at TEC = 140 °C, derived from its 5 W power rating and 160 V nominal Zener voltage. Operation above this current requires active thermal management to maintain junction temperature within −65 °C to +175 °C limits.
Does JANTX1N4987US/TR have ESD protection?
JANTX1N4987US/TR is nonsensitive to electrostatic discharge per MIL-STD-750 Method 1020, with demonstrated immunity to ≥4 kV HBM. This eliminates the need for external ESD protection circuitry in handling and board-level integration for JANTX1N4987US/TR.
What package type is used for JANTX1N4987US/TR?
JANTX1N4987US/TR uses the hermetically sealed "E" package (also known as D-5B), a surface-mount glass case with tungsten slugs and copper end caps finished in Sn/Pb. It is not interchangeable with axial-leaded versions like 1N4987, which lack the US suffix and require different PCB layout.
JANTX1N4987US/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):
- 160 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 350 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 121.6 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
JANTX1N4987US/TR FAQ
1.How can I place an order for JANTX1N4987US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4987US/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 JANTX1N4987US/TR reliable?
The price and inventory of JANTX1N4987US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4987US/TR is usually 5 days.
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5.How can I obtain technical support or documentation for JANTX1N4987US/TR?
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6.How does Aetrix verify that JANTX1N4987US/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4987US/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 JANTX1N4987US/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4987US/TR?
All JANTX1N4987US/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4987US/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 JANTX1N4987US/TR part is unused and in its original packaging.
Return procedure for JANTX1N4987US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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