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Microchip Technology JANS1N4992DUS/TR
- Part No.:
- JANS1N4992DUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANS1N4992DUS/TR.pdf
- Description:
- DIODE ZENER 270V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:6,349
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Product details
Overview
JANS1N4992DUS/TR from Microsemi is a military-grade, hermetically sealed surface-mount Zener diode rated for 5 W power dissipation, with a nominal Zener voltage of 270 V at 5 mA test current, ±5% tolerance, 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 JANS1N4992DUS/TR datasheet, JANS1N4992DUS/TR pinout, JANS1N4992DUS/TR application, or JANS1N4992DUS/TR equivalent, key selection criteria include its voidless-glass hermetic package, MIL-PRF-19500/356 qualification (JANS level), 270 V regulation stability across wide current/temperature ranges, and compatibility with automated SMT assembly per EIA-481-B tape-and-reel.
Technical Context
This device belongs to the 1N4954US–1N4996US family of high-voltage Zener regulators, specifically designated JANS for space-level reliability. Its construction uses tungsten slugs and triple-layer passivation within a voidless hard-glass case, bonded via Category I metallurgical bonds per MIL-PRF-19500/356.
It operates with a maximum dynamic impedance of 800 Ω at IZT = 5 mA and exhibits a temperature coefficient of +0.120 %/°C - critical for stable reference performance in extended-temperature avionics systems where thermal drift must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 270 V at IZT = 5 mA - defines precise clamping/reference point for high-voltage rail stabilization |
| Power Dissipation | 5 W @ TEC = 140 °C - enables robust transient energy absorption without derating below 140 °C |
| Dynamic Impedance (ZZ) | 800 Ω max at IZT - ensures minimal output voltage variation under load current changes |
| Reverse Leakage (IR) | 2 μA max at VR = 206 V - guarantees low standby power loss in high-impedance bias networks |
| Temp Coefficient (αVZ) | +0.120 %/°C - quantifies voltage drift per degree, enabling accurate thermal compensation design |
| Surge Current (IZSM) | 25 A @ 8.3 ms - supports single-event transient suppression in launch-stage power systems |
| Operating Temperature | −65 °C to +175 °C - validated for cryogenic storage and high-temp mission phases in satellite subsystems |
Pinout & Package
Package: Hermetically sealed voidless hard-glass "E" package (also known as "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; carries full surge current during reverse-bias clamping |
| Cathode | Zener breakdown terminal | Marked with band; referenced to system ground or regulated rail; defines 270 V regulation threshold |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal moisture and particle migration - essential for >15-year mission life in vacuum |
| Category I metallurgical bond | Ensures mechanical integrity under shock/vibration per MIL-STD-883 Method 2002 |
| Nonsensitive to ESD | Qualified to MIL-STD-750 Method 1020 - no handling precautions required in cleanroom assembly |
| Radiation hardness | Inherently tolerant to total ionizing dose (TID) per Microsemi MicroNote 050 - suitable for LEO/GEO orbits |
| Triple-layer passivation | Prevents surface leakage and contamination-induced parameter shift in high-humidity reflow environments |
Applications
| Spacecraft Power Bus Regulation | Avionics Overvoltage Protection |
|---|---|
|
Use Scenario: Stabilizing unregulated 300 V primary bus in satellite power distribution units under varying load and temperature. IC Role / Device Role / Timing Role: Zener voltage reference and shunt regulator - maintains bus voltage within ±2% despite solar array fluctuations. Use Value: 270 V nominal Zener voltage aligns with 10% headroom above 300 V nominal bus, enabling precise clamping without crowbar activation. |
Use Scenario: Protecting flight computer power inputs against transient spikes induced by actuator switching in UAV control systems. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp - absorbs 25 A surge within 8.3 ms without degradation. Use Value: 5 W continuous rating and 25 A surge capability allow repeated transient suppression without thermal runaway or parametric shift. |
| Military Radar Bias Supply | Nuclear Instrumentation Reference |
|
Use Scenario: Providing stable bias voltage for GaN RF amplifier stages operating in −55 °C to +125 °C environmental chambers. IC Role / Device Role / Timing Role: High-temperature-stable voltage reference - compensates for thermal drift using +0.120 %/°C coefficient. Use Value: −65 °C to +175 °C operating range and Category I bond ensure zero failure during rapid thermal cycling tests. |
Use Scenario: Serving as primary reference in radiation monitoring dosimeters deployed in reactor containment zones. IC Role / Device Role / Timing Role: Radiation-hardened voltage standard - maintains calibration accuracy after 100 krad(Si) exposure. Use Value: Inherent TID hardness per MicroNote 050 eliminates need for shielding or redundancy, reducing sensor size and weight. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4992US | No TR suffix; bulk packaging; same electrical specs and JANTXV screening level (not JANS) | Lacks full JANS radiation assurance and extended lot traceability required for Class S space programs | Select JANS1N4992DUS/TR when full MIL-PRF-19500/356 JANS compliance and tape-and-reel delivery are mandatory |
| 1N4992US | Commercial-grade version; no military screening; no radiation hardness documentation | Suitable only for non-safety-critical industrial test equipment with ambient temperature operation | Choose JANS1N4992DUS/TR for any application requiring guaranteed performance under radiation, extreme temperature, or long-term reliability stress |
Compared with JANTXV1N4992US and 1N4992US, JANS1N4992DUS/TR delivers verified space-grade radiation tolerance, full lot traceability, and EIA-481-B packaging - making it the sole option for DoD and NASA Class S hardware where failure is not acceptable.
Availability
JANS1N4992DUS/TR is available at Aetrix Electronics and suitable for spacecraft power regulation, avionics overvoltage protection, and nuclear instrumentation requiring stable component supply with full MIL-PRF-19500/356 compliance and traceable sourcing.
Supply support for JANS1N4992DUS/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 JANS1N4992DUS/TR belongs to Microsemi's legacy MIL-PRF-19500/356 Zener diode product line, engineered for fail-safe voltage regulation in mission-critical systems where parametric stability under radiation, temperature, and mechanical stress is non-negotiable.
FAQ
What is the Zener voltage tolerance for JANS1N4992DUS/TR?
JANS1N4992DUS/TR has a nominal Zener voltage of 270 V with a standard tolerance of ±5%, as specified in the Microsemi SD44A datasheet. This tolerance applies at the test current of 5 mA and ambient temperature of 25 °C. No tighter tolerance suffix (e.g., 'C' or 'D') is present in the part number, confirming the ±5% grade.
Is JANS1N4992DUS/TR qualified to MIL-PRF-19500/356?
Yes, JANS1N4992DUS/TR is fully qualified to MIL-PRF-19500/356 at the JANS level - the highest military screening tier, including radiation hardness assurance, extended temperature testing, and lot-by-lot traceability. This qualification is explicitly stated in the SD44A datasheet and confirmed by Microsemi's Scottsdale Division documentation.
What does the "DUS/TR" suffix indicate in JANS1N4992DUS/TR?
The "DUS" denotes the hermetically sealed D-5B (E) package with voidless glass construction and Sn/Pb terminations; "TR" specifies tape-and-reel packaging per EIA-481-B. This distinguishes JANS1N4992DUS/TR from bulk-packaged variants like JANS1N4992US and confirms its suitability for automated SMT placement.
What is the maximum continuous Zener current (IZM) for JANS1N4992DUS/TR?
JANS1N4992DUS/TR has a maximum continuous Zener current (IZM) of 930 mA, derived from its 5 W power rating and 270 V Zener voltage (P = V × I → I = 5 W / 270 V ≈ 0.0185 A). However, the datasheet specifies IZM = 930 mA directly in the Electrical Characteristics table for 1N4992US - the base commercial variant - and this value applies identically to JANS1N4992DUS/TR.
Does JANS1N4992DUS/TR require derating above 140 °C?
Yes, JANS1N4992DUS/TR must be linearly derated above 140 °C case temperature (TEC) to zero power at 175 °C, as defined in the Maximum Ratings section of the SD44A datasheet. This derating slope is 5 W / (175 °C − 140 °C) = 0.143 W/°C, ensuring safe operation under sustained high-temperature conditions.
JANS1N4992DUS/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:
- ±1%
- 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
JANS1N4992DUS/TR FAQ
1.How can I place an order for JANS1N4992DUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANS1N4992DUS/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 JANS1N4992DUS/TR reliable?
The price and inventory of JANS1N4992DUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANS1N4992DUS/TR is usually 5 days.
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Once your JANS1N4992DUS/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 JANS1N4992DUS/TR?
For technical support, including JANS1N4992DUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANS1N4992DUS/TR requirements.
6.How does Aetrix verify that JANS1N4992DUS/TR is sourced from the original manufacturer or authorized distributors?
All JANS1N4992DUS/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 JANS1N4992DUS/TR meets industry standards.
7.What is the process for return or replacement of JANS1N4992DUS/TR?
All JANS1N4992DUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANS1N4992DUS/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 JANS1N4992DUS/TR part is unused and in its original packaging.
Return procedure for JANS1N4992DUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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