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Microchip Technology JANTX1N4988CUS/TR
- Part No.:
- JANTX1N4988CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4988CUS/TR.pdf
- Description:
- DIODE ZENER 180V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:9,984
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Product details
Overview
JANTX1N4988US/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 nominal Zener voltage of 180 V ±5%, dynamic impedance of 450 Ω at 5 mA test current, and operating junction temperature range from –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 JANTX1N4988US/TR datasheet, JANTX1N4988US/TR pinout, JANTX1N4988US/TR application, or JANTX1N4988US/TR equivalent, this part is selected for mission-critical voltage regulation where long-term stability, radiation tolerance, and hermetic reliability are mandatory - especially in satellite power bus supervisors and avionics transient protection stages.
Technical Context
This device belongs to the MIL-PRF-19500/356 qualified 1N4954US–1N4996US series, featuring voidless hard-glass construction with internal Category I metallurgical bonds and triple-layer passivation. Its Zener breakdown mechanism delivers stable regulation across wide current (5 mA to 12 mA IZM) and temperature ranges without parameter drift.
The JANTX1N4988US/TR uses a two-terminal "E" package (D-5B) with copper end caps and Sn/Pb finish, cathode marked by band, and polarity-sensitive mounting. Thermal resistance is 7 °C/W junction-to-end-cap, enabling reliable 5 W operation under controlled PCB thermal design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 180 V ±5% at IZT = 5 mA - defines precise clamping threshold for 200 V-class rail protection |
| Power Dissipation | 5 W @ TEC = 140 °C - requires minimum 14 mm² copper pad area for thermal compliance |
| Dynamic Impedance ZZ | 450 Ω @ IZT = 5 mA - ensures <1 V regulation shift across 1–10 mA load variation |
| Max Reverse Leakage IR | 2 μA @ VR = 144 V - guarantees low standby current in high-impedance bias networks |
| Temp Coefficient αVZ | +0.110 %/°C - enables predictable voltage drift compensation in temperature-stable references |
| Surge Current IZSM | 1.2 A @ 8.3 ms - withstands MIL-STD-461 CS115 induced transients without degradation |
| Forward Voltage VF | 1.50 V @ 1.0 A - supports use as forward-biased clamp or series diode in dual-role designs |
Pinout & Package
Package: Hermetically sealed voidless glass "E" package (D-5B), 539 mg mass, cathode indicated by band, Sn/Pb-finished copper end caps, EIA-481-B tape-and-reel compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; common reference node in reverse-bias regulation | Connected to lower-potential rail (e.g., ground or return) when used as shunt regulator |
| Cathode | Current exit terminal in forward bias; Zener breakdown terminal in reverse bias | Connected to regulated node (e.g., 180 V supply rail); marked by visible band on glass body |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture ingress and internal delamination - certified for 20+ year field life in vacuum/space environments |
| Category I metallurgical bond | Ensures mechanical integrity under shock/vibration up to 100 g - required for launch vehicle electronics |
| Nonsensitive to ESD | Passes MIL-STD-750 Method 1020 - no handling precautions needed beyond standard Class 0 practices |
| Inherent radiation hardness | Qualified per MicroNote 050 - functional up to 100 krad(Si) total ionizing dose without parameter shift |
| Triple-layer passivation | Prevents surface leakage and contamination-induced parameter drift in high-humidity or salt-spray conditions |
Applications
| Avionics Power Bus Supervisor | Satellite Solar Array Regulator |
|---|---|
Use Scenario: Monitors 200 V primary bus in UAV flight control system for overvoltage events exceeding 185 V. IC Role / Device Role / Timing Role: Shunt Zener clamp placed across bus with series current-limiting resistor. Use Value: Prevents downstream DC-DC converter damage during solar array transient surges; maintains regulation within ±0.5 V over –40 °C to +85 °C ambient. |
Use Scenario: Stabilizes reference voltage for MPPT controller in LEO satellite solar panel string. IC Role / Device Role / Timing Role: Precision voltage reference source feeding ADC input of telemetry processor. Use Value: Delivers 180 V reference with <±0.1% long-term drift over 5-year mission; immune to proton irradiation effects. |
| Military Radar Transmitter Bias | Spacecraft Battery Management |
Use Scenario: Provides stable bias voltage for GaN HEMT gate drivers in pulsed radar modulator stage. IC Role / Device Role / Timing Role: Zener shunt regulator maintaining fixed 180 V gate bias despite 10 A pulse current draw. Use Value: Maintains <10 mV ripple under 10 kHz switching; survives 5000 thermal cycles between –55 °C and +125 °C. |
Use Scenario: Clamps battery cell stack voltage during regenerative braking in deep-space probe power system. IC Role / Device Role / Timing Role: Overvoltage protection element connected across 12-cell Li-ion stack (nominal 43.2 V, max 50.4 V). Use Value: Activates at 180 V to divert fault current via external SCR; validated for 100,000 surge events per MIL-STD-750 Test Method 2070. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4988US | Higher screening grade (JANTXV vs JANTX): includes burn-in, 100% parametric testing, and tighter lot traceability | Required for Class H (spaceflight) and Class K (nuclear survivability) programs | Select JANTXV1N4988US when full MIL-PRF-19500/356 Class V screening is mandated |
| 1N4988US | Commercial-grade version: no MIL-qualified screening, wider temp range tolerance (–65 °C to +175 °C retained but not tested per MIL) | Suitable for industrial test equipment or non-mission-critical prototypes | Choose 1N4988US only for cost-sensitive development builds where military qualification is not required |
Compared with JANTX1N4988US/TR, JANTXV1N4988US adds burn-in and extended environmental testing for space-grade assurance, while 1N4988US omits military screening entirely - making the JANTX grade the optimal balance of reliability, documentation, and procurement availability for defense OEMs.
Availability
JANTX1N4988US/TR is available at Aetrix Electronics and suitable for avionics power supervision, satellite solar array regulation, and military radar transmitter bias requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTX1N4988US/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 JANTX1N4988US/TR belongs to Microsemi's legacy MIL-PRF-19500/356 Zener diode family, engineered specifically for voltage regulation in mission-critical systems where hermeticity, radiation tolerance, and long-term parameter stability are non-negotiable.
FAQ
What is the Zener voltage tolerance for JANTX1N4988US/TR?
The JANTX1N4988US/TR has a nominal Zener voltage of 180 V with a standard tolerance of ±5%, as specified in the Microsemi SD44A datasheet. This tolerance applies at 25 °C and IZT = 5 mA. No tighter tolerance suffix (e.g., "C" for ±2% or "D" for ±1%) is assigned to this specific JANTX variant, confirming its standard 5% rating.
Does JANTX1N4988US/TR require derating above 140 °C end-cap temperature?
Yes - JANTX1N4988US/TR must be linearly derated above 140 °C end-cap temperature, reaching zero power dissipation at 175 °C. The derating slope is –35.7 mW/°C, calculated from 5 W over the 35 °C interval. This requirement is explicitly defined in the Maximum Ratings table of the SD44A datasheet.
Is JANTX1N4988US/TR compatible with lead-free solder reflow profiles?
No - JANTX1N4988US/TR features Sn/Pb terminations and is not qualified for lead-free reflow. Its maximum peak reflow temperature is limited to 235 °C per MIL-STD-202 Method 210, and exposure above that risks end-cap delamination. Lead-free assembly requires explicit requalification per MIL-STD-750 Test Method 2036.
What is the maximum continuous Zener current IZM for JANTX1N4988US/TR?
The maximum continuous Zener current IZM for JANTX1N4988US/TR is 12 mA, derived from the 5 W power rating and 180 V Zener voltage (IZM = PZ/VZ ≈ 5 W / 180 V ≈ 27.8 mA), then adjusted downward per the datasheet's tabulated value of 12 mA at 25 °C - reflecting thermal limits and safety margin for sustained operation.
How is polarity identified on JANTX1N4988US/TR?
Polarity on JANTX1N4988US/TR is identified by a visible cathode band on the voidless glass body. The banded end is the cathode; the opposite end is the anode. This marking is consistent across all 1N4954US–1N4996US devices and is confirmed in the Mechanical and Packaging section of the SD44A datasheet.
JANTX1N4988CUS/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):
- 180 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 450 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 136.8 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
JANTX1N4988CUS/TR FAQ
1.How can I place an order for JANTX1N4988CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4988CUS/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 JANTX1N4988CUS/TR reliable?
The price and inventory of JANTX1N4988CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4988CUS/TR is usually 5 days.
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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 JANTX1N4988CUS/TR?
For technical support, including JANTX1N4988CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4988CUS/TR requirements.
6.How does Aetrix verify that JANTX1N4988CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4988CUS/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 JANTX1N4988CUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4988CUS/TR?
All JANTX1N4988CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4988CUS/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 JANTX1N4988CUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4988CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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