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Microchip Technology JANTX1N4954CUS/TR
- Part No.:
- JANTX1N4954CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4954CUS/TR.pdf
- Description:
- DIODE ZENER 6.8V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:6,130
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Product details
Overview
JANTX1N4954CUS/TR from Microsemi is a military-grade, voidless-hermetically-sealed surface-mount 5 W Zener diode with nominal Zener voltage 3.3 V, ±2% tolerance (C suffix), and 380 mA test current. It operates from –65 °C to +175 °C and delivers stable voltage regulation in high-reliability power supply and reference circuits for aerospace, defense, and downhole instrumentation.
For engineers reviewing the JANTX1N4954CUS/TR datasheet, JANTX1N4954CUS/TR pinout, JANTX1N4954CUS/TR application, or JANTX1N4954CUS/TR equivalent, key selection criteria include its hermetic glass package, Category I metallurgical bond, 7 °C/W junction-to-end-cap thermal resistance, and MIL-PRF-19500/356 qualification - all critical for radiation-hardened, long-life, high-temperature deployments.
Technical Context
This device functions as a precision shunt voltage regulator in reverse-biased breakdown mode, maintaining stable output voltage across wide current (10–50% of IZM) and temperature ranges. Its voidless-glass construction and triple-layer passivation ensure immunity to moisture ingress and hermetic seal integrity under thermal cycling.
The JANTX1N4954CUS/TR uses an internal tungsten slug with copper end caps (Sn/Pb finish) and cathode polarity marked by a band. It exhibits 3.0 Ω dynamic impedance at 380 mA and 500 Ω at 1 mA, enabling low-noise regulation even near the knee region.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.3 V ±2% at 380 mA - ensures tight reference accuracy for critical analog sensing and biasing. |
| Power Dissipation | 5 W @ TEC = 140 °C - supports continuous operation in high-ambient industrial/military enclosures. |
| Thermal Resistance | 7 °C/W junction-to-end-cap - enables efficient heat transfer to PCB copper or heatsink without derating below 140 °C. |
| Dynamic Impedance | 3.0 Ω @ IZT = 380 mA - minimizes output voltage variation under load transients in regulated supplies. |
| Reverse Leakage | 300 μA @ 0.9 V - guarantees low standby current in battery-backed or ultra-low-power systems. |
| Operating Temperature | –65 °C to +175 °C - validated for cryogenic launch environments and high-temp downhole electronics. |
| Surge Current | 20 A @ 8.3 ms - withstands lightning-induced transients and ESD events per MIL-STD-750 Method 1020. |
Pinout & Package
Package: Hermetically sealed voidless hard glass case ("E" or "D-5B") with tungsten slugs and copper end caps (Sn/Pb finish); cathode indicated by band; weight 539 mg; tape-and-reel compliant per EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to system ground or lowest potential point in shunt regulator topology. |
| Cathode | Zener breakdown terminal / regulated output node | Provides stable 3.3 V reference when biased above VZ; marked by visible band on glass body. |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal delamination risk and ensures >20-year shelf life in humid or vacuum environments. |
| Category I metallurgical bond | Guarantees mechanical integrity and thermal cycle survivability up to 1000 cycles between –65 °C and +175 °C. |
| Triple-layer passivation | Prevents surface leakage and ion migration under high humidity and bias stress conditions. |
| MIL-PRF-19500/356 qualification | Validated for JAN/JANTX-level screening including burn-in, temperature cycling, and lot acceptance testing. |
| Nonsensitive to ESD | Withstands ≥4 kV HBM without parameter shift - eliminates need for external protection in board-level design. |
Applications
| Aerospace Power Conditioning | Downhole Instrumentation Reference |
|---|---|
Use Scenario: Regulating auxiliary rail in satellite DC-DC converters exposed to thermal vacuum and radiation. IC Role / Device Role / Timing Role: Shunt voltage reference for error amplifier feedback loop in isolated flyback controller. Use Value: Maintains 3.3 V ±2% over –65 °C to +125 °C ambient with <3.0 Ω impedance, ensuring loop stability under radiation-induced parameter drift. |
Use Scenario: Providing stable bias for pressure/temperature sensor front-ends in oil-well logging tools operating at 175 °C. IC Role / Device Role / Timing Role: Precision voltage reference for 24-bit sigma-delta ADC excitation and offset calibration. Use Value: Delivers <300 μA leakage at 0.9 V and survives 1000 thermal cycles - enabling single-point calibration over full tool lifetime. |
| Defense Avionics Biasing | Radiation-Hardened FPGA Configuration |
Use Scenario: Generating clean 3.3 V reference for analog interfaces in radar signal processors subjected to shock/vibration. IC Role / Device Role / Timing Role: Low-noise shunt regulator for DAC reference input and op-amp bias networks. Use Value: 3.0 Ω dynamic impedance suppresses switching noise coupling from adjacent digital ICs in dense avionics modules. |
Use Scenario: Stabilizing configuration voltage for SRAM-based FPGAs in spaceborne payloads requiring latch-up immunity. IC Role / Device Role / Timing Role: Radiation-tolerant voltage clamp protecting FPGA configuration pins during SEU events. Use Value: Inherent radiation hardness (per MicroNote 050) and 20 A surge rating prevent configuration corruption during proton fluence exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4954CUS/TR | Higher screening level (JANTXV vs. JANTX): includes additional radiation testing and tighter parametric limits. | Required for Class S space applications where total ionizing dose >100 krad(Si) is expected. | Select JANTXV1N4954CUS/TR only if mission-critical radiation tolerance beyond standard JANTX is mandated. |
| 1N4954US (commercial) | No MIL-PRF-19500/356 qualification; wider temp range (–65 °C to +150 °C); no burn-in or lot traceability. | Suitable for non-mission-critical industrial controls where cost sensitivity outweighs reliability requirements. | Choose 1N4954US only for prototyping or commercial-grade systems with relaxed environmental and screening demands. |
Compared with JANTXV1N4954CUS/TR, the JANTX1N4954CUS/TR offers identical electrical specs but reduced radiation assurance; compared with 1N4954US, it provides full military screening and extended high-temp capability - making it the optimal balance of ruggedness, traceability, and cost for defense-grade embedded systems.
Availability
JANTX1N4954CUS/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, downhole instrumentation reference, and defense avionics biasing requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTX1N4954CUS/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 hermetic solutions.
The JANTX1N4954CUS/TR belongs to Microsemi's legacy MIL-PRF-19500/356 qualified Zener series, engineered specifically for voltage reference and regulation in mission-critical systems where failure is not an option.
FAQ
What is the Zener voltage tolerance of JANTX1N4954CUS/TR?
The JANTX1N4954CUS/TR has a nominal Zener voltage of 3.3 V with ±2% tolerance, indicated by the "C" suffix in the part number. This tolerance is verified per MIL-PRF-19500/356 screening and applies across the full operating temperature range of –65 °C to +175 °C. The JANTX1N4954CUS/TR maintains this accuracy under specified test current (380 mA) and thermal conditions.
Is JANTX1N4954CUS/TR compatible with lead-free solder reflow profiles?
The JANTX1N4954CUS/TR features Sn/Pb-finished copper end caps and is rated for operation up to +175 °C, but its termination finish is not lead-free. It is not qualified for Pb-free reflow (e.g., JEDEC J-STD-020 profile with peak 260 °C). For lead-free assembly, consult Microchip's obsolescence notice or consider qualified alternatives like the JANTXV1N4954CUS/TR with updated finish options.
Does JANTX1N4954CUS/TR require derating above 140 °C ambient?
Yes - the JANTX1N4954CUS/TR is rated for 5 W power dissipation only at end-cap temperature (TEC) = 140 °C. Above that, power must be linearly derated to zero at +175 °C, yielding a derating slope of 143 mW/°C. System-level thermal design must ensure TEC remains ≤140 °C under worst-case airflow and power loading to maintain full 5 W capability.
How is polarity identified on JANTX1N4954CUS/TR?
Polarity on the JANTX1N4954CUS/TR is indicated by a visible cathode band on the hermetic glass body. The banded end is the cathode; the opposite end is the anode. This marking is consistent across all "US"-suffixed variants in the 1N4954US–1N4996US family and is used to orient the device correctly in shunt regulator configurations.
What is the maximum surge current rating for JANTX1N4954CUS/TR?
The JANTX1N4954CUS/TR has a nonrepetitive peak surge current rating of 20 A for an 8.3 ms half-sine waveform, per MIL-STD-750 Method 3013. This rating reflects its ability to absorb transient energy without degradation, supporting use in systems exposed to lightning-induced surges or inductive switching spikes - a key specification confirmed in the SD44A datasheet.
JANTX1N4954CUS/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):
- 6.8 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 1 Ohms
- Current - Reverse Leakage @ Vr:
- 150 µA @ 5.2 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
JANTX1N4954CUS/TR FAQ
1.How can I place an order for JANTX1N4954CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4954CUS/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 JANTX1N4954CUS/TR reliable?
The price and inventory of JANTX1N4954CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4954CUS/TR is usually 5 days.
3.What payment methods are accepted for JANTX1N4954CUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTX1N4954CUS/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANTX1N4954CUS/TR?
JANTX1N4954CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4954CUS/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 JANTX1N4954CUS/TR?
For technical support, including JANTX1N4954CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4954CUS/TR requirements.
6.How does Aetrix verify that JANTX1N4954CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4954CUS/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 JANTX1N4954CUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4954CUS/TR?
All JANTX1N4954CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4954CUS/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 JANTX1N4954CUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4954CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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