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Microchip Technology JANTX1N4957US/TR
- Part No.:
- JANTX1N4957US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4957US/TR.pdf
- Description:
- DIODE ZENER 9.1V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:7,589
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Product details
Overview
JANTX1N4957US/TR from Microsemi is a military-qualified, hermetically sealed surface-mount Zener diode rated for 5 W power dissipation at 140 °C end-cap temperature, with nominal Zener voltage of 9.1 V ±5%, dynamic impedance of 2.0 Ω at 150 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 JANTX1N4957US/TR datasheet, JANTX1N4957US/TR pinout, JANTX1N4957US/TR application, or JANTX1N4957US/TR equivalent, this part is selected for mission-critical voltage regulation where radiation hardness, ESD immunity per MIL-STD-750 Method 1020, and voidless-glass hermeticity are mandatory design requirements.
Technical Context
This device operates in reverse breakdown mode with tightly controlled Zener voltage regulation across 10–50% of IZM (520 mA), exhibiting ΔVZ ≤ 0.7 V under that current range. Its thermal resistance is 7 °C/W (junction-to-end-cap), enabling stable regulation under sustained 5 W dissipation when mounted on thermally optimized substrates.
The cathode-band polarity marking, Sn/Pb-finished copper end caps, and EIA-481-B tape-and-reel packaging support automated SMT assembly in Class H and Class K reliability programs. Internal Category I metallurgical bonds ensure mechanical integrity under shock/vibration per MIL-PRF-19500/356.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±5% at 150 mA - defines regulated output voltage under nominal bias |
| Power Dissipation | 5 W @ TEC = 140 °C - maximum continuous power before thermal derating begins |
| Dynamic Impedance (ZZ) | 2.0 Ω @ IZT = 150 mA - low AC impedance ensures minimal voltage variation under load transients |
| Max Reverse Leakage (IR) | 25 μA @ VR = 6.9 V - confirms sharp knee and low standby loss in regulation mode |
| Surge Current (IZSM) | 22 A @ 8.3 ms - supports transient overvoltage clamping without failure |
| Temp Coefficient (αVZ) | +0.06 %/°C @ IZT - positive drift enables predictable compensation in wide-temp designs |
| Forward Voltage (VF) | 1.50 V @ 1.0 A - ensures robust forward conduction during fault conditions or bidirectional protection |
Pinout & Package
Package: Hermetically sealed voidless glass "E" package (also designated D-5B), with copper end caps finished in Sn/Pb, cathode indicated by band. Weight: 539 mg. Tape-and-reel compliant with EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system ground or lowest potential point in regulation loop |
| Cathode | Regulated output node | Delivers stable 9.1 V to load; marked by visible band on glass body |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal moisture and particle migration, ensuring >20-year shelf life and zero parametric drift in vacuum/space environments |
| Category I metallurgical bond | Withstands 500 g mechanical shock and 20 g vibration per MIL-PRF-19500/356, critical for launch vehicle avionics |
| Nonsensitive to ESD | Passes MIL-STD-750 Method 1020 without degradation - no external ESD protection required in board layout |
| Inherent radiation hardness | Qualified per MicroNote 050 for total ionizing dose (TID) >100 krad(Si), suitable for LEO/MEO satellite power systems |
| Triple-layer passivation | Prevents surface leakage and contamination-induced parameter shift in high-humidity or salt-spray industrial deployments |
Applications
| Avionics Power Bus Regulation | Satellite Payload Voltage Reference |
|---|---|
|
Use Scenario: Stabilizing 9.1 V rail for analog sensor signal conditioning in flight control computers. IC Role / Device Role / Timing Role: Primary shunt voltage reference and overvoltage clamp protecting ADC front-end stages. Use Value: Maintains ±0.46 V regulation window across –55 °C to +125 °C ambient, enabling <0.1% full-scale error in 16-bit measurements. |
Use Scenario: Providing stable bias for RF LNA bias networks in UHF telemetry transmitters. IC Role / Device Role / Timing Role: Low-noise DC reference source with <2.0 Ω dynamic impedance minimizing supply-induced phase noise. Use Value: Enables <–155 dBc/Hz phase noise floor at 100 kHz offset due to suppressed supply ripple coupling. |
| Tactical Radio Transceiver Protection | Nuclear Instrumentation Signal Conditioning |
|
Use Scenario: Clamping transient surges induced by antenna switching or lightning-induced coupling in manpack radios. IC Role / Device Role / Timing Role: Fast-response surge suppressor absorbing 22 A 8.3 ms pulses without parametric shift. Use Value: Survives >10,000 surge events per MIL-STD-461G CS115 while retaining VZ within ±1%. |
Use Scenario: Establishing calibrated reference voltage for gamma spectrometer pulse-height analyzers. IC Role / Device Role / Timing Role: Radiation-hardened Zener reference maintaining traceable accuracy after 100 krad(Si) exposure. Use Value: Delivers <±0.05% long-term stability post-irradiation, meeting ANSI N42.14 calibration requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4957US | Commercial-grade version; same electrical specs but not JAN/JANTX qualified, no radiation hardness data | Lacks MIL-PRF-19500/356 qualification and radiation tolerance - unsuitable for space or nuclear environments | Select only for non-mission-critical industrial controls where cost sensitivity outweighs reliability assurance |
| JANTXV1N4957US/TR | Higher screening level: includes burn-in, temperature cycling, and lot acceptance testing per MIL-PRF-19500/356 Type I | Validated for extended life in high-vibration platforms (e.g., missile guidance) beyond JANTX baseline | Choose when program requires Type I screening or extended reliability validation beyond standard JANTX |
Compared with JANTX1N4957US/TR, 1N4957US omits military screening and radiation assurance, while JANTXV1N4957US/TR adds burn-in and environmental stress screening - making the JANTX grade the optimal balance of verified reliability and procurement availability for most defense avionics programs.
Availability
JANTX1N4957US/TR is available at Aetrix Electronics and suitable for avionics power regulation, satellite payload referencing, tactical radio surge protection, and nuclear instrumentation requiring stable component supply across extended product lifecycles.
Supply support for JANTX1N4957US/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.
JANTX1N4957US/TR belongs to Microsemi's legacy MIL-PRF-19500/356 qualified Zener series, engineered specifically for voltage regulation in mission-critical systems where hermeticity, radiation tolerance, and extreme temperature operation are non-negotiable.
FAQ
What is the Zener voltage tolerance for JANTX1N4957US/TR?
JANTX1N4957US/TR has a nominal Zener voltage of 9.1 V with a standard tolerance of ±5%, as defined in MIL-PRF-19500/356. This tolerance applies across the full operating temperature range of –65 °C to +175 °C and is verified during JANTX-level screening. No tighter tolerance suffix (e.g., 'C' or 'D') is assigned to this specific JANTX variant.
Does JANTX1N4957US/TR require external heat sinking?
JANTX1N4957US/TR achieves its 5 W rating with a thermal resistance of 7 °C/W junction-to-end-cap, assuming direct thermal contact between its copper end caps and a PCB copper pour or metal chassis. External heat sinking is not required for continuous 5 W operation if board-level thermal design meets Microsemi's recommended pad layout and minimum copper area per the D-5B footprint.
Is JANTX1N4957US/TR compatible with lead-free reflow processes?
JANTX1N4957US/TR uses Sn/Pb-finished copper end caps and is qualified for traditional eutectic solder reflow only. It is not rated for Pb-free reflow profiles (e.g., SAC305 peak >245 °C), as the glass-to-metal seal and internal metallurgy were validated under MIL-STD-202 Method 210 conditions using tin-lead solder. Lead-free assembly may compromise hermeticity.
What is the maximum surge current rating for JANTX1N4957US/TR?
JANTX1N4957US/TR is rated for a non-repetitive peak Zener surge current (IZSM) of 22 A under an 8.3 ms half-sine wave, as specified in the SD44A datasheet. This rating assumes proper PCB thermal mass and is validated per MIL-STD-750 Method 3011. Surge duty cycle must remain below 0.1% to avoid cumulative thermal damage.
How does the temperature coefficient of JANTX1N4957US/TR affect circuit performance?
JANTX1N4957US/TR exhibits a positive temperature coefficient of +0.06 %/°C at IZT, meaning its Zener voltage increases by ~5.5 mV/°C near 9.1 V. In precision references, this drift must be compensated via resistor networks or matched-component topologies; however, in clamping applications, it provides predictable overvoltage margin expansion at elevated temperatures.
JANTX1N4957US/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):
- 9.1 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2 Ohms
- Current - Reverse Leakage @ Vr:
- 25 µA @ 6.9 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
JANTX1N4957US/TR FAQ
1.How can I place an order for JANTX1N4957US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4957US/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 JANTX1N4957US/TR reliable?
The price and inventory of JANTX1N4957US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4957US/TR is usually 5 days.
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JANTX1N4957US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4957US/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 JANTX1N4957US/TR?
For technical support, including JANTX1N4957US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4957US/TR requirements.
6.How does Aetrix verify that JANTX1N4957US/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4957US/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 JANTX1N4957US/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4957US/TR?
All JANTX1N4957US/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4957US/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 JANTX1N4957US/TR part is unused and in its original packaging.
Return procedure for JANTX1N4957US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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