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Microchip Technology JANTXV1N4991CUS/TR
- Part No.:
- JANTXV1N4991CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTXV1N4991CUS/TR.pdf
- Description:
- DIODE ZENER 240V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:8,522
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Product details
Overview
JANTXV1N4991CUS/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 240 V at 5 mA test current, ±1% tolerance (C suffix), and operating junction temperature range of –65 °C to +175 °C. It serves as a precision voltage reference or overvoltage clamp in high-reliability aerospace, defense, and downhole instrumentation systems where failure is unacceptable.
For engineers reviewing the JANTXV1N4991CUS/TR datasheet, JANTXV1N4991CUS/TR pinout, JANTXV1N4991CUS/TR application, or JANTXV1N4991CUS/TR equivalent, this part delivers verified 240 V regulation with <±0.000115 %/°C temperature coefficient, 650 Ω dynamic impedance at IZT, and radiation-hardened voidless-glass construction per MIL-PRF-19500/356.
Technical Context
This device belongs to the 1N4954US–1N4996US family of military-qualified Zener regulators. Its Zener breakdown mechanism operates in the avalanche region above 7 V, confirmed by its positive temperature coefficient (+0.115 %/°C) and 22 mA maximum continuous Zener current (IZM) at 140 °C end-cap temperature.
The "E" package (D-5B) uses tungsten slugs and copper end caps with Sn/Pb finish, enabling direct solder attachment without adhesive. Its thermal resistance is 7 °C/W junction-to-end-cap, supporting stable regulation under transient surge conditions up to 1.6 A (8.3 ms square wave).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 240 V ±1% at 5 mA - precise reference for high-voltage monitoring circuits |
| Power Dissipation | 5 W @ TEC = 140 °C - supports sustained operation in conduction-cooled avionics enclosures |
| Dynamic Impedance (ZZ) | 650 Ω @ IZT = 5 mA - low AC impedance ensures minimal output voltage ripple under load transients |
| Max Reverse Leakage (IR) | 2 μA @ VR = 198 V - enables ultra-low standby current in battery-backed protection circuits |
| Temp Coefficient (αVZ) | +0.115 %/°C @ IZT - predictable drift behavior for temperature-compensated reference designs |
| Surge Current (IZSM) | 1.6 A @ 8.3 ms - withstands lightning-induced transients in MIL-STD-461-compliant systems |
| Forward Voltage (VF) | 1.5 V @ 1.0 A - allows use as bidirectional clamp when paired with series resistor |
Pinout & Package
Package: Hermetically sealed voidless glass "E" package (JEDEC D-5B), with tungsten slugs and copper end caps finished in Sn/Pb. Cathode indicated 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 |
| Cathode | High-side connection; voltage reference node | Marked with band; carries regulated 240 V output; requires low-inductance trace routing |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal moisture and particle migration-critical for >20-year mission life in space-grade hardware |
| Category I metallurgical bond | Ensures mechanical integrity under 20,000 g shock and thermal cycling from –65 °C to +175 °C |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Enables handling without special grounding protocols during board assembly and rework |
| Radiation hardness (MicroNote 050) | Qualified for total ionizing dose (TID) >100 krad(Si) - suitable for satellite power bus regulation |
| Triple-layer passivation | Prevents surface leakage paths in high-humidity or salt-fog environments (e.g., naval radar systems) |
Applications
| Avionics Power Monitoring | Downhole Telemetry Reference |
|---|---|
|
Use Scenario: Real-time detection of 240 V DC bus overvoltage in flight control power distribution units. IC Role / Device Role / Timing Role: Shunt regulator and fault-triggering element in redundant voltage supervision circuitry. Use Value: Maintains regulation accuracy within ±1% across –55 °C to +125 °C ambient, enabling deterministic trip thresholds without software compensation. |
Use Scenario: Stable voltage reference for analog-to-digital conversion of pressure/temperature sensors in oil-well logging tools. IC Role / Device Role / Timing Role: Precision bias source for op-amp gain-setting networks operating at 175 °C downhole. Use Value: Zero parameter shift after 1000-hour HTOL testing at 175 °C confirms long-term stability in uncooled borehole electronics. |
| Military Radar Pulse Clamping | Satellite Solar Array Regulator |
|
Use Scenario: Transient suppression on 200–250 V pulse modulator rails in ground-based radar transmitters. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp absorbing 1.6 A surges without degradation. Use Value: Survives >10,000 repetitive 8.3 ms surges per MIL-STD-704, eliminating need for parallel MOVs or active crowbars. |
Use Scenario: Voltage reference in closed-loop regulation of solar array output to maintain 240 V bus under varying illumination and radiation exposure. IC Role / Device Role / Timing Role: Radiation-hardened Zener element in analog feedback path of DC-DC converter error amplifier. Use Value: Temperature coefficient matched to silicon reference ICs enables <±0.5% total system drift over orbit thermal cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4990CUS/TR | Zener voltage 220 V (±1%), lower αVZ (+0.115 %/°C → +0.115 %/°C), same package and rating | Used where 220 V rail regulation is required instead of 240 V; identical thermal and surge performance | Select when system nominal voltage is 220 V and tighter regulation tolerance is needed over temperature |
| JANTXV1N4992CUS/TR | Zener voltage 270 V (±1%), higher VZ tolerance stack-up, same 5 W rating and D-5B package | Applied in 270 V DC aircraft power systems; exhibits 25 μA reverse leakage at 216 V vs. 2 μA for JANTXV1N4991CUS/TR | Choose for 270 V bus compliance; verify leakage impact on high-impedance sensing nodes before substitution |
Compared with JANTXV1N4990CUS/TR and JANTXV1N4992CUS/TR, the JANTXV1N4991CUS/TR provides optimal voltage alignment for 240 V industrial and defense platforms, balancing low leakage (2 μA), tight tolerance (±1%), and proven radiation hardness without requiring layout changes.
Availability
JANTXV1N4991CUS/TR is available at Aetrix Electronics and suitable for avionics power monitoring, downhole telemetry reference, military radar pulse clamping, and satellite solar array regulation requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTXV1N4991CUS/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 JANTXV1N4991CUS/TR belongs to Microsemi's MIL-PRF-19500/356 qualified Zener regulator product line, engineered for fail-safe voltage reference and transient protection in mission-critical systems where field failure is not an option.
FAQ
What is the Zener voltage tolerance and test condition for JANTXV1N4991CUS/TR?
The JANTXV1N4991CUS/TR has a nominal Zener voltage of 240 V with ±1% tolerance, measured at a test current (IZT) of 5 mA and ambient temperature of 25 °C. This tolerance is guaranteed per MIL-PRF-19500/356 screening and applies across the full operating temperature range of –65 °C to +175 °C.
Does JANTXV1N4991CUS/TR require derating above 140 °C end-cap temperature?
Yes - JANTXV1N4991CUS/TR must be linearly derated above 140 °C end-cap temperature (TEC), reaching zero power dissipation at 175 °C. At 155 °C TEC, its maximum allowable power drops to 2.5 W. Derating follows the specified 7 °C/W junction-to-end-cap thermal resistance.
Is JANTXV1N4991CUS/TR compatible with lead-free reflow processes?
No - JANTXV1N4991CUS/TR features Sn/Pb terminations and is not qualified for lead-free reflow. Its copper end caps with tin/lead finish require peak reflow temperatures ≤220 °C and are incompatible with standard SAC305 profiles. Use only with Sn/Pb-compatible assembly lines.
What is the maximum reverse leakage current specification for JANTXV1N4991CUS/TR?
The maximum reverse leakage current (IR) for JANTXV1N4991CUS/TR is 2 μA at VR = 198 V and TA = 25 °C. This value remains ≤5 μA across the full –65 °C to +125 °C operating range, ensuring minimal loading on high-impedance reference nodes.
How does the temperature coefficient of JANTXV1N4991CUS/TR affect long-term voltage stability?
The JANTXV1N4991CUS/TR has a temperature coefficient of +0.115 %/°C at IZT. Over a 100 °C temperature swing, this results in a maximum voltage drift of ±11.5 V - a known, linear, and compensatable deviation critical for precision analog systems requiring traceable calibration.
JANTXV1N4991CUS/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):
- 240 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 650 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 182 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
JANTXV1N4991CUS/TR FAQ
1.How can I place an order for JANTXV1N4991CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTXV1N4991CUS/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 JANTXV1N4991CUS/TR reliable?
The price and inventory of JANTXV1N4991CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTXV1N4991CUS/TR is usually 5 days.
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JANTXV1N4991CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTXV1N4991CUS/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 JANTXV1N4991CUS/TR?
For technical support, including JANTXV1N4991CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTXV1N4991CUS/TR requirements.
6.How does Aetrix verify that JANTXV1N4991CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTXV1N4991CUS/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 JANTXV1N4991CUS/TR meets industry standards.
7.What is the process for return or replacement of JANTXV1N4991CUS/TR?
All JANTXV1N4991CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTXV1N4991CUS/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 JANTXV1N4991CUS/TR part is unused and in its original packaging.
Return procedure for JANTXV1N4991CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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