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Microchip Technology JANTX1N4992US/TR
- Part No.:
- JANTX1N4992US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4992US/TR.pdf
- Description:
- DIODE ZENER 270V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:5,685
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Product details
Overview
JANTX1N4992US/TR from Microsemi is a hermetically sealed, voidless-glass surface-mount Zener diode rated for 5 W power dissipation at 140 °C end-cap temperature, with nominal Zener voltage 270 V ±5%, dynamic impedance 800 Ω at 5 mA test current, and operating junction temperature range −65 °C to +175 °C. It serves as a precision voltage reference and overvoltage clamp in high-reliability military power conditioning circuits.
For engineers reviewing the JANTX1N4992US/TR datasheet, JANTX1N4992US/TR pinout, JANTX1N4992US/TR application, or JANTX1N4992US/TR equivalent, this page delivers verified electrical parameters, MIL-PRF-19500/356 qualification status, thermal resistance (7 °C/W), surge current rating (25 A @ 8.3 ms), and hermetic glass package construction details critical for aerospace and defense design validation.
Technical Context
This device belongs to Microsemi's JAN/JANTX-qualified 1N4954US–1N4996US series, featuring Category I metallurgical bonds and triple-layer passivation for enhanced reliability. Its Zener breakdown mechanism operates across a wide reverse current range (10%–50% of IZM), delivering stable regulation with ΔVZ ≤25 V under specified load variation.
The voidless-glass hermetic seal ensures immunity to moisture ingress and long-term parameter drift, while the tungsten slug construction supports robust thermal conduction from junction to end cap. Polarity is marked by cathode band; terminations use copper end caps with Sn/Pb finish per MIL-STD-750 Method 1020 ESD testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 270 V ±5% at IZT = 5 mA - defines precise clamping threshold for overvoltage protection in 250–290 V rail systems |
| Power Dissipation | 5 W @ TEC = 140 °C - enables sustained operation in high-temperature avionics enclosures without derating below 140 °C |
| Dynamic Impedance ZZ | 800 Ω @ IZT = 5 mA - indicates moderate regulation stiffness suitable for low-current reference buffering |
| Max Reverse Leakage IR | 2 μA @ VR = 206 V - ensures minimal standby power loss in high-impedance bias networks |
| Surge Current IZSM | 25 A @ 8.3 ms half-sine - withstands lightning-induced transients per MIL-STD-461 CS115 |
| Thermal Resistance θJC | 7 °C/W junction-to-end-cap - allows direct thermal path to heatsink via soldered end caps |
| Operating Temperature | −65 °C to +175 °C - qualified for cryogenic launch environments and turbine-mounted electronics |
Pinout & Package
Package: Hermetically sealed voidless hard glass case with tungsten slugs; "E" package (also known as "D-5B"), surface-mount, cathode indicated by band; weight 539 mg; tape-and-reel compliant with EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration; carries full surge current during clamping |
| Cathode | Zener breakdown terminal | Marked by band; connected to higher-potential rail; establishes regulated voltage drop when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/356 Qualified | JANTX grade certifies compliance with military screening, burn-in, and lot acceptance test requirements for Class H reliability |
| Voidless Hermetic Glass Seal | Eliminates internal delamination risk and moisture-induced parameter shift over 20+ year service life |
| Category I Metallurgical Bond | Ensures mechanical integrity of internal junction under shock/vibration up to 100 g peak per MIL-STD-883 Method 2007 |
| Nonsensitive to ESD | Withstands ≥4 kV HBM per MIL-STD-750 Method 1020 - no external protection required in handling or assembly |
| Radiation Hardened | Inherently tolerant to total ionizing dose (TID) >100 krad(Si) per MicroNote 050 - suitable for space-grade power supplies |
Applications
| Aerospace Power Bus Protection | Defense Radar Bias Supply |
|---|---|
Use Scenario: Clamping transient spikes on 270 V DC aircraft distribution buses during load dump or generator switching events. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to shunt excess energy into ground plane. Use Value: Maintains bus voltage within ±5% of 270 V during 25 A, 8.3 ms surges - prevents downstream FPGA and ADC latch-up. | Use Scenario: Providing stable high-voltage bias to traveling-wave tube (TWT) collector stages in airborne radar transmitters. IC Role / Device Role / Timing Role: Precision voltage reference and overvoltage limiter in unregulated HV supply feedback loop. Use Value: Delivers <2 μA leakage at 206 V, enabling microamp-level bias current stability critical for TWT gain linearity. |
| Satellite Solar Array Regulator | Nuclear Instrumentation Channel |
Use Scenario: Regulating output of radiation-hardened solar array MPPT converters exposed to deep-space thermal cycling. IC Role / Device Role / Timing Role: Primary Zener reference in analog feedback network controlling buck-boost converter duty cycle. Use Value: Stable 270 V reference across −65 °C to +175 °C with <0.12 %/°C tempco - eliminates calibration drift over orbital lifetime. | Use Scenario: Protecting gamma spectrometer front-end amplifiers from electrostatic discharge and cosmic-ray-induced voltage spikes. IC Role / Device Role / Timing Role: High-voltage transient suppressor placed directly at detector bias input connector. Use Value: Withstands 25 A surge without parametric shift - preserves gain calibration and energy resolution after repeated ESD 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 |
|---|---|---|---|
| JANTXV1N4992US/TR | Higher screening level (JANTXV vs JANTX); tighter tempco (±0.09 %/°C vs ±0.12 %/°C); same VZ, ZZ, and package | Required for programs demanding extended temperature characterization and enhanced lot traceability | Select JANTXV1N4992US/TR when mission-critical systems require full MIL-PRF-19500/356 Class V screening |
| 1N4992US/TR (non-JAN) | No military screening; commercial-grade reliability; identical electrical specs and package | Suitable only for non-military industrial prototypes or cost-sensitive ground-test equipment | Choose 1N4992US/TR for lab validation where MIL-spec is not mandated and lifecycle continuity is secondary |
Compared with JANTX1N4992US/TR, JANTXV1N4992US/TR offers superior temperature coefficient control and extended screening for flight-critical systems, while 1N4992US/TR provides identical electrical performance at lower cost for non-qualified applications - both share the same D-5B footprint and thermal behavior.
Availability
JANTX1N4992US/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, defense radar biasing, and satellite solar array regulation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for JANTX1N4992US/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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets, with core expertise in radiation-hardened and high-temperature devices.
The JANTX1N4992US/TR belongs to Microsemi's legacy MIL-qualified Zener diode family engineered specifically for voltage regulation and transient suppression in mission-critical power systems operating beyond commercial temperature limits.
FAQ
What is the Zener voltage tolerance for JANTX1N4992US/TR?
JANTX1N4992US/TR has a nominal Zener voltage of 270 V with a standard tolerance of ±5%, consistent with MIL-PRF-19500/356 requirements for JANTX-grade devices. This tolerance applies at the specified test current of 5 mA and ambient temperature of 25 °C. Tighter tolerances (e.g., ±2% or ±1%) are available with different suffixes but are not applicable to the JANTX1N4992US/TR variant.
Does JANTX1N4992US/TR require external heat sinking?
JANTX1N4992US/TR does not require external heat sinking under typical 5 W continuous operation because its 7 °C/W junction-to-end-cap thermal resistance enables sufficient conduction through the soldered end caps to a PCB copper pour or metal chassis. However, for sustained operation near maximum junction temperature (+175 °C), thermal vias and 2 oz copper planes are recommended to maintain reliability margins.
Is JANTX1N4992US/TR compatible with lead-free reflow processes?
JANTX1N4992US/TR uses Sn/Pb terminations and is not qualified for lead-free reflow profiles. Its maximum peak reflow temperature is limited to 235 °C per MIL-STD-202 Method 210, and exposure above this risks degradation of the hermetic glass seal. For RoHS-compliant designs, consult Microchip's qualified lead-free alternatives or verify compatibility with controlled thermal profiling.
What is the surge current rating of JANTX1N4992US/TR and how is it tested?
JANTX1N4992US/TR is rated for 25 A nonrepetitive surge current at an 8.3 ms half-sine waveform, per MIL-STD-461 CS115 and manufacturer characterization. This rating reflects validated performance under standardized transient stress conditions and is measured with the device mounted per recommended pad layout and thermal conditions outlined in SD44A.pdf.
How does the voidless-glass construction of JANTX1N4992US/TR improve long-term reliability?
The voidless-glass construction of JANTX1N4992US/TR eliminates internal microcavities that could nucleate moisture ingress or mechanical fracture under thermal cycling. This hermetic seal maintains stable Zener voltage and leakage current over decades of operation in harsh environments - a key requirement validated in MIL-PRF-19500/356 qualification testing for JANTX-grade devices.
JANTX1N4992US/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):
- 270 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 800 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 206 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
JANTX1N4992US/TR FAQ
1.How can I place an order for JANTX1N4992US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4992US/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 JANTX1N4992US/TR reliable?
The price and inventory of JANTX1N4992US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4992US/TR is usually 5 days.
3.What payment methods are accepted for JANTX1N4992US/TR?
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Once your JANTX1N4992US/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 JANTX1N4992US/TR?
For technical support, including JANTX1N4992US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4992US/TR requirements.
6.How does Aetrix verify that JANTX1N4992US/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4992US/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 JANTX1N4992US/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4992US/TR?
All JANTX1N4992US/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4992US/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 JANTX1N4992US/TR part is unused and in its original packaging.
Return procedure for JANTX1N4992US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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