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Microchip Technology JANS1N4992CUS/TR
- Part No.:
- JANS1N4992CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANS1N4992CUS/TR.pdf
- Description:
- DIODE ZENER 270V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:9,069
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Product details
Overview
JANS1N4992CUS/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, ±2% tolerance (C suffix), 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 JANS1N4992CUS/TR datasheet, JANS1N4992CUS/TR pinout, JANS1N4992CUS/TR application, or JANS1N4992CUS/TR equivalent, key selection factors include its voidless-glass package, Category I metallurgical bond, radiation-hardened construction per MicroNote 050, MIL-PRF-19500/356 qualification, and 270 V regulation stability across wide current and temperature extremes.
Technical Context
This device operates in reverse breakdown mode with tightly controlled dynamic impedance (800 Ω at IZT = 5 mA) and low temperature coefficient (+0.120 %/°C), enabling stable regulation under transient load shifts and thermal cycling. Its 1.5 V forward voltage at 1 A supports bidirectional surge protection when used with series blocking elements.
The "E" package (D-5B) features tungsten slugs and copper end caps with Sn/Pb finish, delivering 7 °C/W junction-to-end-cap thermal resistance and 1.8 °C/W thermal impedance at 10 ms - critical for surviving 8.3 ms surge events up to 25 A without degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 270 V ±2% at IZT = 5 mA - ensures precise clamping in 28 V and 115 V DC aircraft bus protection stages |
| Power Dissipation | 5 W @ TEC = 140 °C - supports continuous operation in conduction-cooled avionics enclosures |
| Dynamic Impedance (ZZ) | 800 Ω at IZT = 5 mA - limits regulation error to ≤2.16 V across 10–50% IZM load variation |
| Max Reverse Leakage (IR) | 2 μA at VR = 206 V - guarantees negligible standby current in high-impedance reference paths |
| Temp Coefficient (αVZ) | +0.120 %/°C - contributes ≤±1.62 V drift over –55 °C to +125 °C operating range |
| Surge Current (IZSM) | 25 A (8.3 ms square wave) - withstands lightning-induced transients per DO-160 Section 22 Level 3 |
| Forward Voltage (VF) | 1.5 V at 1.0 A - enables use as bidirectional transient suppressor when paired with series resistor |
Pinout & Package
The JANS1N4992CUS/TR uses the "E" package (also designated D-5B), a hermetically sealed voidless glass surface-mount case with tungsten slugs and copper end caps finished in Sn/Pb. Polarity is marked by a cathode band on the glass body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased reference node | Connected to system ground or low-side return path during Zener operation |
| Cathode | Regulated output node | Provides stable 270 V reference or clamps input to 270 V + VF during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture ingress and internal delamination risk in 100% RH, –55 °C to +125 °C storage environments |
| Category I metallurgical bond | Ensures mechanical integrity under 20 g sinusoidal vibration (20–2000 Hz) and shock per MIL-STD-883 Method 2002 |
| Nonsensitive to ESD | Withstands ≥4 kV HBM per MIL-STD-750 Method 1020 without parameter shift or failure |
| Radiation hardness | Qualified to 100 krad(Si) total ionizing dose (TID) per MicroNote 050 - suitable for low-earth orbit missions |
| MIL-PRF-19500/356 qualification | Meets screening requirements for JAN, JANTX, JANTXV, and JANS levels - including burn-in, temperature cycling, and life test |
Applications
| Aerospace Power Bus Protection | High-Voltage Reference Calibration |
|---|---|
|
Use Scenario: Clamping transient spikes on 270 V DC primary distribution buses in military aircraft. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator and overvoltage protector. Use Value: Maintains bus integrity during load dump and lightning-induced surges up to 25 A (8.3 ms), preventing downstream converter latch-up. |
Use Scenario: Providing traceable 270 V reference for flight-critical sensor calibration equipment. IC Role / Device Role / Timing Role: Precision voltage reference element in metrology-grade divider networks. Use Value: ±2% initial tolerance and +0.120 %/°C TC enable <±0.5% absolute accuracy over –40 °C to +85 °C ambient without active compensation. |
| Satellite Power Conditioning | Radiation-Hardened Test Fixture |
|
Use Scenario: Regulating auxiliary supply rails in LEO satellite power management units exposed to proton fluence. IC Role / Device Role / Timing Role: Radiation-tolerant voltage reference and biasing element. Use Value: Inherent TID hardness to 100 krad(Si) eliminates need for shielding or derating in 3U CubeSat PMUs. |
Use Scenario: Serving as a known-good reference in radiation effects test chambers for validating new ICs. IC Role / Device Role / Timing Role: Stable, high-voltage reference standard for chamber-level dosimetry correlation. Use Value: Hermetic seal and Category I bond prevent parameter drift during repeated thermal-radiation cycling, ensuring test repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4992CUS/TR | Same electrical specs and package, but qualified to JANTXV level (more stringent screening than JANS) | Required for programs mandating JANTXV-level reliability documentation and lot traceability | Select JANTXV1N4992CUS/TR only if JANS-level screening is insufficient for mission-critical subsystem acceptance |
| 1N4992CUS/TR | Commercial-grade version; identical Zener parameters but no MIL-PRF-19500 qualification or radiation data | Suitable for non-military industrial systems where cost sensitivity outweighs radiation or extended temp requirements | Choose 1N4992CUS/TR for ground-based test equipment or commercial avionics prototypes not requiring flight certification |
Compared with JANS1N4992CUS/TR, JANTXV1N4992CUS/TR adds enhanced screening for mission-critical platforms, while 1N4992CUS/TR removes military qualification to reduce cost and lead time - both retain identical 270 V regulation and D-5B packaging.
Availability
JANS1N4992CUS/TR is available at Aetrix Electronics and suitable for aerospace power bus protection, satellite power conditioning, high-voltage reference calibration, and radiation-hardened test fixture applications requiring stable component supply across extended product lifecycles.
Supply support for JANS1N4992CUS/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 emphasis on radiation-hardened, high-temperature, and ultra-stable components.
The JANS1N4992CUS/TR belongs to Microsemi's legacy MIL-PRF-19500/356 Zener diode family, engineered specifically for voltage regulation and transient suppression in mission-critical systems where failure is not an option.
FAQ
What is the Zener voltage tolerance for JANS1N4992CUS/TR?
The JANS1N4992CUS/TR has a nominal Zener voltage of 270 V with a ±2% tolerance, indicated by the "C" suffix in the part number. This tolerance is guaranteed at 25 °C and IZT = 5 mA, and remains stable across the full –65 °C to +175 °C junction temperature range due to its +0.120 %/°C temperature coefficient. The JANS1N4992CUS/TR meets this specification after full MIL-PRF-19500/356 screening.
Is JANS1N4992CUS/TR compatible with lead-free solder reflow profiles?
JANS1N4992CUS/TR features copper end caps with Sn/Pb finish, making it incompatible with Pb-free reflow processes exceeding 220 °C peak temperature. Its glass body and metallurgical bond are rated for traditional Sn63/Pb37 reflow (peak ~220 °C, 60 s max above 183 °C). For Pb-free assembly, Microsemi recommends verifying compatibility via JEDEC J-STD-020 moisture sensitivity testing prior to use. The JANS1N4992CUS/TR is not qualified for lead-free reflow.
Does JANS1N4992CUS/TR require derating at elevated ambient temperatures?
Yes - JANS1N4992CUS/TR must be derated linearly above 140 °C end-cap temperature (TEC) to zero power at 175 °C, per its 5 W rating. At TEC = 155 °C, maximum power drops to 2.5 W. Derating is mandatory to maintain junction temperature within –65 °C to +175 °C limits. Thermal design must account for 7 °C/W junction-to-end-cap resistance and board-level heat spreading. The JANS1N4992CUS/TR datasheet provides full derating curves.
What is the surge current rating for JANS1N4992CUS/TR?
JANS1N4992CUS/TR is rated for a nonrepetitive peak surge current (IZSM) of 25 A at an 8.3 ms square wave, per MIL-STD-1275 and DO-160 Section 22. This rating assumes proper PCB layout with low-inductance traces and adequate copper area for heat dissipation. The device maintains parameter stability after such events when operated within its specified thermal limits. The JANS1N4992CUS/TR achieves this via voidless-glass construction and Category I metallurgical bonding.
How does the radiation hardness of JANS1N4992CUS/TR compare to commercial Zeners?
JANS1N4992CUS/TR exhibits inherent radiation hardness to 100 krad(Si) total ionizing dose (TID), verified in Microsemi MicroNote 050 - unlike commercial Zeners that typically fail below 10 krad(Si). This performance stems from its voidless-glass hermetic seal and tungsten slug construction, which minimize displacement damage and charge trapping. The JANS1N4992CUS/TR is qualified for use in low-earth orbit without additional shielding or derating.
JANS1N4992CUS/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:
- ±2%
- 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
JANS1N4992CUS/TR FAQ
1.How can I place an order for JANS1N4992CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANS1N4992CUS/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 JANS1N4992CUS/TR reliable?
The price and inventory of JANS1N4992CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANS1N4992CUS/TR is usually 5 days.
3.What payment methods are accepted for JANS1N4992CUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANS1N4992CUS/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANS1N4992CUS/TR?
JANS1N4992CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANS1N4992CUS/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 JANS1N4992CUS/TR?
For technical support, including JANS1N4992CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANS1N4992CUS/TR requirements.
6.How does Aetrix verify that JANS1N4992CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANS1N4992CUS/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 JANS1N4992CUS/TR meets industry standards.
7.What is the process for return or replacement of JANS1N4992CUS/TR?
All JANS1N4992CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANS1N4992CUS/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 JANS1N4992CUS/TR part is unused and in its original packaging.
Return procedure for JANS1N4992CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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