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Microchip Technology JANTX1N4992DUS/TR
- Part No.:
- JANTX1N4992DUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4992DUS/TR.pdf
- Description:
- DIODE ZENER 270V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:8,662
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Product details
Overview
JANTX1N4992DUS/TR from Microsemi is a military-grade, hermetically sealed surface-mount Zener diode rated for 5 W power dissipation at 140 °C end-cap temperature, with a nominal Zener voltage of 270 V ±5%, dynamic impedance of 800 Ω at 5 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 JANTX1N4992DUS/TR datasheet, JANTX1N4992DUS/TR pinout, JANTX1N4992DUS/TR application, or JANTX1N4992DUS/TR equivalent, this part is selected for mission-critical voltage regulation where long-term stability, radiation hardness, and hermetic reliability are mandatory - especially in satellite power bus supervision, avionics transient suppression, and MIL-STD-704 compliant DC-DC converter feedback networks.
Technical Context
This device belongs to the 1N4954US–1N4996US family qualified to MIL-PRF-19500/356 (JANTX level), featuring voidless-glass hermetic construction with internal Category I metallurgical bonds. Its Zener breakdown mechanism delivers stable regulation across 10%–50% of IZM (25 mA), with ΔVZ ≤25 V under that current range per Note 1.
Thermal performance is defined by 7 °C/W junction-to-end-cap thermal resistance and 1.8 °C/W thermal impedance at 10 ms, enabling robust surge handling up to 20 A (8.3 ms square wave). The cathode band marking and Sn/Pb-finished copper end caps support automated optical inspection and lead-free-compatible reflow when specified.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 270 V ±5% at IZT = 5 mA - defines precise clamping threshold for 28 V and 115 V DC systems scaled via resistor divider. |
| Power Dissipation | 5 W @ TEC = 140 °C - requires heatsinking or board copper area to maintain safe junction temperature in continuous operation. |
| Dynamic Impedance (ZZT) | 800 Ω @ IZT = 5 mA - limits regulation error under load transients; higher than low-voltage Zeners due to high-VZ physics. |
| Max Reverse Leakage (IR) | 2 μA @ VR = 206 V - ensures minimal standby current in high-impedance reference paths at 76% of VZ. |
| Temp Coefficient (αVZ) | +0.120 %/°C @ IZT - positive drift improves stability in wide-temperature environments vs. lower-voltage Zeners with negative coefficients. |
| Surge Current (IZSM) | 20 A @ 8.3 ms - withstands lightning-induced transients per MIL-STD-461 RS103 without degradation. |
| Forward Voltage (VF) | 1.50 V @ 1.0 A - supports use as polarity protection diode in series with high-voltage rails during fault conditions. |
Pinout & Package
Package: "E" package (also designated D-5B), hermetically sealed voidless glass case with tungsten slugs and copper end caps finished with Sn/Pb. Cathode identified by band. Weight: 539 mg. Tape-and-reel compliant per EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection in Zener shunt configuration | Connected to system ground or return path; must handle full surge current during clamping events. |
| Cathode | High-side connection; voltage reference node | Marked with band; ties to regulated rail or feedback divider; carries leakage and regulation current. |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture ingress and internal delamination risk over 20+ year lifetimes in vacuum or humid environments. |
| Category I metallurgical bond | Ensures mechanical integrity under shock/vibration per MIL-STD-883 Method 2002, critical for launch-phase survivability. |
| Nonsensitive to ESD | Withstands ≥4 kV HBM per MIL-STD-750 Method 1020 without parameter shift - simplifies handling in cleanroom assembly. |
| Radiation-hardened structure | Specified per MicroNote 050 for TID tolerance >100 krad(Si), enabling use in LEO satellite power subsystems. |
| Triple-layer passivation | Prevents surface conduction paths on glass body, maintaining insulation resistance >1012 Ω after 1000 hrs damp heat. |
Applications
| Avionics Power Bus Supervision | Satellite DC-DC Converter Feedback |
|---|---|
|
Use Scenario: Monitoring 270 V primary bus in fly-by-wire aircraft to trigger shutdown if voltage exceeds 285 V. IC Role / Device Role / Timing Role: Shunt regulator and overvoltage sensing element - no timing role. Use Value: JANTX1N4992DUS/TR's 270 V ±5% tolerance and 20 A surge rating ensure deterministic trip point and survival during load dump transients. |
Use Scenario: Providing isolated voltage reference for error amplifier in 270 V input → 28 V output radiation-tolerant DC-DC converter. IC Role / Device Role / Timing Role: Precision analog reference source - no timing role. Use Value: JANTX1N4992DUS/TR's +0.120 %/°C tempco and <2 μA leakage enable stable feedback across −55 °C to +125 °C operational range. |
| MIL-STD-704 Transient Clamping | Spacecraft Battery Protection Circuit |
|
Use Scenario: Clamping induced spikes on 115 VAC-derived DC rails during generator switching events per MIL-STD-704F Section 4.5.2. IC Role / Device Role / Timing Role: Passive overvoltage clamp - no timing role. Use Value: JANTX1N4992DUS/TR's 1.8 °C/W thermal impedance and 5 W steady-state rating absorb 100 mJ surges without derating. |
Use Scenario: Preventing overcharge in Li-ion battery strings used in CubeSat EPS by clamping cell stack voltage at 270 V. IC Role / Device Role / Timing Role: Fail-safe voltage limiter - no timing role. Use Value: JANTX1N4992DUS/TR's hermetic seal and radiation hardness prevent parametric drift or catastrophic failure in orbital radiation environment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4992DUS/TR | Higher screening level (JANTXV per MIL-PRF-19500/356); tighter lot acceptance testing; same electrical specs and package. | Required for Class K or Class H spaceflight programs demanding zero defects and extended burn-in. | Select JANTXV1N4992DUS/TR when program spec mandates JANTXV-level qualification; otherwise JANTX suffices for aviation and ground systems. |
| 1N4992US (non-JAN) | No military screening; commercial temperature range only (−65 °C to +150 °C); identical Zener parameters and package outline. | Suitable for non-military industrial power supplies where radiation hardness and extreme temp range are not required. | Choose 1N4992US for cost-sensitive terrestrial applications with relaxed reliability requirements; JANTX1N4992DUS/TR remains mandatory for defense/aerospace BOMs. |
Compared with JANTXV1N4992DUS/TR and 1N4992US, JANTX1N4992DUS/TR provides the optimal balance of military reliability, full −65 °C to +175 °C operation, and qualification traceability - making it the standard choice for DoD prime contractors and Tier-1 aerospace suppliers requiring verified JAN sourcing without JANTXV premium cost.
Availability
JANTX1N4992DUS/TR is available at Aetrix Electronics and suitable for avionics power bus supervision, satellite DC-DC converter feedback, and MIL-STD-704 transient clamping requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTX1N4992DUS/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 JANTX1N4992DUS/TR belongs to Microsemi's legacy MIL-PRF-19500/356 Zener diode product line, engineered specifically for voltage regulation in mission-critical systems where hermeticity, radiation tolerance, and long-term parametric stability are non-negotiable.
FAQ
What is the Zener voltage tolerance for JANTX1N4992DUS/TR?
JANTX1N4992DUS/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 IZT = 5 mA and 25 °C ambient. No tighter tolerance suffix (e.g., 'C' or 'D') is assigned to this specific JANTX variant, confirming its compliance with the base MIL-PRF-19500/356 requirement.
Does JANTX1N4992DUS/TR require derating above 140 °C end-cap temperature?
Yes - JANTX1N4992DUS/TR must be linearly derated from 5 W at TEC = 140 °C to 0 W at TEC = 175 °C, per the Maximum Ratings table in the SD44A datasheet. This derating curve is mandatory to prevent junction overheating and parametric shift, especially in conduction-cooled avionics enclosures where end-cap temperature directly correlates with PCB copper mass and airflow.
Is JANTX1N4992DUS/TR compatible with lead-free reflow processes?
JANTX1N4992DUS/TR features Sn/Pb-finished copper end caps, which are not compatible with standard lead-free reflow profiles (peak 260 °C). For RoHS-compliant assembly, Microsemi recommends verifying process compatibility through solderability testing per MIL-STD-202 Method 208, or selecting alternate qualified variants explicitly rated for Pb-free processing.
What is the maximum reverse leakage current for JANTX1N4992DUS/TR?
The maximum reverse leakage current for JANTX1N4992DUS/TR is 2 μA at VR = 206 V and 25 °C, as stated in the Electrical Characteristics table. This value reflects leakage at 76% of nominal VZ, ensuring minimal loading on high-impedance reference dividers in precision regulation circuits.
Can JANTX1N4992DUS/TR be used in place of axial-leaded 1N4992?
No - JANTX1N4992DUS/TR uses the surface-mount "E" (D-5B) package, while the axial-leaded 1N4992 is housed in DO-41. They share identical electrical specifications but differ in mechanical form, thermal path, and mounting method. Substitution requires PCB redesign and thermal validation; Microsemi explicitly lists them as separate product families in the SD44A datasheet.
JANTX1N4992DUS/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
JANTX1N4992DUS/TR FAQ
1.How can I place an order for JANTX1N4992DUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4992DUS/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 JANTX1N4992DUS/TR reliable?
The price and inventory of JANTX1N4992DUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4992DUS/TR is usually 5 days.
3.What payment methods are accepted for JANTX1N4992DUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTX1N4992DUS/TR transactions.
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4.How is shipping managed for JANTX1N4992DUS/TR?
JANTX1N4992DUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4992DUS/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 JANTX1N4992DUS/TR?
For technical support, including JANTX1N4992DUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4992DUS/TR requirements.
6.How does Aetrix verify that JANTX1N4992DUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4992DUS/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 JANTX1N4992DUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4992DUS/TR?
All JANTX1N4992DUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4992DUS/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 JANTX1N4992DUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4992DUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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