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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Microchip Technology JANS1N4992US/TR

Name: JANS1N4992US/TR
Brand: Microchip Technology
SKU: JANS1N4992US/TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: JANS1N4992US/TR

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: SQ-MELF, E

Datasheet:: JANS1N4992US/TR.pdf

Description:: DIODE ZENER 270V 5W E-MELF

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Product details

Overview

JANS1N4992US/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 JANS1N4992US/TR datasheet, JANS1N4992US/TR pinout, JANS1N4992US/TR application, or JANS1N4992US/TR equivalent, key selection criteria include its voidless-glass hermetic package, radiation-hardened construction per MicroNote 050, MIL-PRF-19500/356 qualification (JANS level), and 270 V Zener regulation under wide-temperature, high-stress conditions.

Technical Context

This device operates in reverse breakdown mode with a specified Zener voltage of 270 V at I_ZT = 5 mA and exhibits dynamic impedance of 800 Ω at that point. Its thermal resistance is 10 °C/W junction-to-end-cap, enabling stable regulation up to 175 °C junction temperature when mounted on thermally optimized PCB pads.

The JANS1N4992US/TR features triple-layer passivation, Category I internal metallurgical bonds, and nonsensitivity to ESD per MIL-STD-750 Method 1020. It delivers 25 A surge current capability for 8.3 ms square-wave transients and maintains voltage regulation within ΔV_Z = 25 V across 10–50% of I_ZM.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	270 V at I_ZT = 5 mA - defines precise clamping threshold in high-voltage protection circuits
Power Dissipation	5 W @ T_EC = 125 °C - requires heatsinking or copper pour for sustained operation above ambient
Dynamic Impedance Z_Z	800 Ω @ I_ZT - limits regulation sensitivity to current variation in feedback loops
Max Reverse Leakage	2 μA @ V_R = 206 V - ensures minimal standby power loss in high-impedance bias networks
Temp Coefficient αV_Z	+0.120 %/°C - enables predictable drift compensation in temperature-critical references
Surge Current I_ZSM	25 A @ 8.3 ms - withstands lightning-induced transients without degradation
Forward Voltage V_F	1.50 V @ 1.0 A - supports use as forward-biased clamp or series diode in dual-mode designs

Pinout & Package

Package: Hermetically sealed voidless hard glass case ("E" or "D-5B") with copper end caps and Sn/Pb finish; cathode indicated by band; weight 539 mg; tape-and-reel compliant per EIA-481-B.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current entry terminal in forward bias; ground reference in reverse-bias regulation	Connected to system ground or low-side return path; must accommodate 1.5 V forward drop at 1 A
Cathode	Current exit terminal in forward bias; regulated output node in reverse bias	Connected to protected rail or reference node; carries full Zener current and must be routed with low-inductance layout

Key Features

Feature	Design Value
Voidless hermetic glass seal	Prevents moisture ingress and long-term parameter drift in vacuum or humid space environments
MIL-PRF-19500/356 JANS qualification	Guarantees screening, testing, and traceability for flight-critical avionics and defense systems
Triple-layer passivation	Blocks surface conduction paths and enhances reliability under ionizing radiation exposure
Category I metallurgical bond	Ensures mechanical integrity and thermal cycling survivability from −65 °C to +175 °C
Nonsensitive to ESD (MIL-STD-750 Method 1020)	Eliminates need for handling precautions beyond standard Class 0 ESD controls

Applications

Avionics Power Bus Protection	Satellite DC-DC Converter Reference
Use Scenario: Clamping transient overvoltages on 28 V or 115 V aircraft distribution buses during load dump or generator switching events. IC Role / Device Role / Timing Role: High-energy Zener clamp placed across bus rails to limit peak voltage to safe levels for downstream converters and controllers. Use Value: Withstands 25 A surge for 8.3 ms and maintains 270 V regulation margin above nominal bus voltage, preventing catastrophic failure of MIL-STD-704-compliant equipment.	Use Scenario: Providing stable voltage reference for isolated feedback loops in radiation-tolerant DC-DC modules aboard LEO satellites. IC Role / Device Role / Timing Role: Precision Zener reference in optocoupler-based secondary-side regulation circuitry. Use Value: Inherent radiation hardness (MicroNote 050) and −65 °C to +175 °C operation ensure stable 270 V reference over orbital thermal cycles without calibration drift.
Nuclear Instrumentation Signal Conditioning	Tactical Radar Transmitter Bias Supply
Use Scenario: Stabilizing high-voltage bias supplies for Geiger-Müller tubes and scintillation detectors in reactor monitoring systems. IC Role / Device Role / Timing Role: Series-connected Zener string element providing fixed voltage drop in multi-kV bias chains. Use Value: 5 W power rating and 10 °C/W thermal resistance allow parallel mounting on copper heat spreaders to sustain continuous 270 V regulation under gamma irradiation.	Use Scenario: Regulating gate drive voltage for GaN HEMTs in pulsed radar transmitter stages requiring fast recovery and high-voltage stability. IC Role / Device Role / Timing Role: Clamp diode protecting gate driver ICs from Miller-induced voltage spikes during high-dV/dt switching. Use Value: 800 Ω dynamic impedance and 25 V regulation window (ΔV_Z) ensure predictable clamping behavior during nanosecond-scale transients.

Avionics Power Bus Protection

Satellite DC-DC Converter Reference

Use Scenario: Clamping transient overvoltages on 28 V or 115 V aircraft distribution buses during load dump or generator switching events.

IC Role / Device Role / Timing Role: High-energy Zener clamp placed across bus rails to limit peak voltage to safe levels for downstream converters and controllers.

Use Value: Withstands 25 A surge for 8.3 ms and maintains 270 V regulation margin above nominal bus voltage, preventing catastrophic failure of MIL-STD-704-compliant equipment.

Use Scenario: Providing stable voltage reference for isolated feedback loops in radiation-tolerant DC-DC modules aboard LEO satellites.

IC Role / Device Role / Timing Role: Precision Zener reference in optocoupler-based secondary-side regulation circuitry.

Use Value: Inherent radiation hardness (MicroNote 050) and −65 °C to +175 °C operation ensure stable 270 V reference over orbital thermal cycles without calibration drift.

Nuclear Instrumentation Signal Conditioning

Tactical Radar Transmitter Bias Supply

Use Scenario: Stabilizing high-voltage bias supplies for Geiger-Müller tubes and scintillation detectors in reactor monitoring systems.

IC Role / Device Role / Timing Role: Series-connected Zener string element providing fixed voltage drop in multi-kV bias chains.

Use Value: 5 W power rating and 10 °C/W thermal resistance allow parallel mounting on copper heat spreaders to sustain continuous 270 V regulation under gamma irradiation.

Use Scenario: Regulating gate drive voltage for GaN HEMTs in pulsed radar transmitter stages requiring fast recovery and high-voltage stability.

IC Role / Device Role / Timing Role: Clamp diode protecting gate driver ICs from Miller-induced voltage spikes during high-dV/dt switching.

Use Value: 800 Ω dynamic impedance and 25 V regulation window (ΔV_Z) ensure predictable clamping behavior during nanosecond-scale transients.

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	Same electrical specs but qualified to JANTXV level (lower screening rigor than JANS); no radiation hardness documentation	Suitable for ground-based military systems where total ionizing dose (TID) is not a design constraint	Select JANTXV1N4992US when cost and lead time are prioritized over space-grade radiation assurance
1N4992US	Commercial-grade version; lacks MIL-PRF-19500 qualification, radiation data, and extended temperature screening	Applicable only in non-safety-critical industrial power supplies with ambient temperature < 125 °C	Choose 1N4992US for prototyping or cost-sensitive terrestrial applications where JANS-level reliability is unnecessary

Compared with JANS1N4992US/TR, JANTXV1N4992US offers identical voltage and power performance with reduced qualification overhead, while 1N4992US omits military screening and radiation assurance-making it unsuitable for aerospace or nuclear environments where JANS1N4992US/TR's hermetic seal and TID resilience are mandatory.

Availability

JANS1N4992US/TR is available at Aetrix Electronics and suitable for avionics power bus protection, satellite DC-DC converter reference, and nuclear instrumentation signal conditioning requiring stable component supply across extended temperature ranges and radiation-exposed environments.

Supply support for JANS1N4992US/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 JANS1N4992US/TR belongs to Microsemi's military-qualified Zener diode family designed specifically for voltage regulation and transient suppression in mission-critical systems operating under extreme thermal, mechanical, and radiation stress.

FAQ

What is the Zener voltage tolerance for JANS1N4992US/TR?

The JANS1N4992US/TR has a nominal Zener voltage of 270 V with a standard tolerance of ±5%, as defined in the MIL-PRF-19500/356 specification. This tolerance applies across the full operating temperature range of −65 °C to +175 °C and is verified during JANS-level screening. No tighter tolerance suffix (e.g., 'C' or 'D') is assigned to the JANS1N4992US/TR variant.

Does JANS1N4992US/TR require derating above 125 °C case temperature?

Yes, JANS1N4992US/TR must be derated linearly above 125 °C case temperature (T_EC) to zero power at 175 °C, per its maximum ratings table. The derating slope is 5 W / 50 °C = 100 mW/°C. This reflects its classification in the 1N4954US–1N4996US group, which specifies 5 W @ T_EC = 125 °C.

Is JANS1N4992US/TR compatible with lead-free soldering processes?

No, JANS1N4992US/TR uses tin/lead (Sn/Pb) finish on its copper end caps and is not qualified for lead-free reflow profiles. Its termination specification explicitly references Sn/Pb plating, and the datasheet does not provide Pb-free reflow compatibility data or JEDEC J-STD-020 moisture sensitivity level (MSL) rating.

What is the maximum continuous Zener current I_ZM for JANS1N4992US/TR?

The maximum continuous Zener current I_ZM for JANS1N4992US/TR is 930 mA, calculated from its 5 W power rating and 270 V Zener voltage (I_ZM = P_Z/V_Z ≈ 5 W / 270 V). This value is confirmed in the Electrical Characteristics table on page 2 of the SD44A.pdf datasheet.

How is polarity marked on the JANS1N4992US/TR package?

JANS1N4992US/TR uses a cathode band marking on the glass body to indicate polarity. The banded end is the cathode terminal, consistent with standard diode marking convention. No alphanumeric marking is present, per the Mechanical and Packaging section stating "MARKING: None" for this series.

JANS1N4992US/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

JANS1N4992US/TR FAQ

1.How can I place an order for JANS1N4992US/TR through Aetrix?

Please submit a Request for Quotation (RFQ) for JANS1N4992US/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 JANS1N4992US/TR reliable?

The price and inventory of JANS1N4992US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANS1N4992US/TR is usually 5 days.

3.What payment methods are accepted for JANS1N4992US/TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANS1N4992US/TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for JANS1N4992US/TR?

JANS1N4992US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your JANS1N4992US/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 JANS1N4992US/TR?

For technical support, including JANS1N4992US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANS1N4992US/TR requirements.

6.How does Aetrix verify that JANS1N4992US/TR is sourced from the original manufacturer or authorized distributors?

All JANS1N4992US/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 JANS1N4992US/TR meets industry standards.

7.What is the process for return or replacement of JANS1N4992US/TR?

All JANS1N4992US/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANS1N4992US/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 JANS1N4992US/TR part is unused and in its original packaging.

Return procedure for JANS1N4992US/TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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