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Microchip Technology JANTX1N4954DUS/TR
- Part No.:
- JANTX1N4954DUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4954DUS/TR.pdf
- Description:
- DIODE ZENER 6.8V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:6,159
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Product details
Overview
JANTX1N4954DUS/TR from Microsemi is a hermetically sealed, voidless-glass surface-mount 5 W Zener diode with nominal Zener voltage of 6.8 V, ±1% tolerance (D suffix), and 175 °C maximum junction temperature. It delivers stable voltage regulation in high-reliability military and aerospace power supply rails, precision reference circuits, and overvoltage protection stages where failure is unacceptable.
For engineers reviewing the JANTX1N4954DUS/TR datasheet, JANTX1N4954DUS/TR pinout, JANTX1N4954DUS/TR application, or JANTX1N4954DUS/TR equivalent, this part supports critical design verification for MIL-PRF-19500/356-compliant systems requiring radiation-hardened, ESD-insensitive, and thermally robust voltage clamping at 6.8 V.
Technical Context
This device operates as a two-terminal voltage regulator in reverse-biased breakdown mode, with a specified test current (IZT) of 175 mA and dynamic impedance (ZZ @ IZT) of 1.0 Ω. Its internal Category I metallurgical bond and triple-layer passivation ensure long-term stability under thermal cycling and high-humidity environments.
The JANTX1N4954DUS/TR is rated for 5 W power dissipation at TEC = 140 °C, with thermal resistance of 7 °C/W (junction-to-end-cap) and surge capability of 29.3 A (8.3 ms square wave). It exhibits a Zener temperature coefficient of ±0.07 %/°C and reverse leakage current ≤150 μA at VR = 5.2 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.8 V ±1% at IZT = 175 mA - precise reference for analog monitoring and feedback loops |
| Power Dissipation | 5 W @ TEC = 140 °C - enables compact, high-power-density regulation without forced cooling |
| Dynamic Impedance | 1.0 Ω @ IZT - ensures minimal output voltage variation under load transients |
| Max Reverse Leakage | 150 μA @ VR = 5.2 V - guarantees low quiescent current in standby and battery-backed circuits |
| Junction Temperature | –65 °C to +175 °C - supports operation in extreme environmental conditions including space and engine bays |
| Surge Current | 29.3 A (8.3 ms square wave) - withstands repetitive line surges and ESD-induced transients |
| Forward Voltage | 1.50 V @ 1.0 A - defines conduction loss during forward-bias fault conditions |
Pinout & Package
Package: Hermetically sealed voidless glass "E" package (also designated D-5B), with copper end caps and 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 | Current sink in reverse bias / current source in forward bias | Connected to lower-potential node; establishes reference ground path during regulation |
| Cathode | Regulated output node in reverse bias | Provides stable 6.8 V reference; marked by band; connects to supply rail or error amplifier input |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass construction | Eliminates moisture ingress and internal delamination, ensuring >20-year reliability in sealed enclosures |
| Category I metallurgical bond | Guarantees mechanical integrity under shock/vibration up to 100 g and thermal cycling from –65 °C to +175 °C |
| Triple-layer passivation | Prevents surface conduction paths and leakage drift in high-humidity or contaminated atmospheres |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Withstands ≥8 kV HBM without parameter shift - reduces need for external ESD protection |
| Radiation hardness (MicroNote 050) | Tolerates total ionizing dose (TID) ≥100 krad(Si) - qualified for low-earth orbit and nuclear instrumentation |
Applications
| Aerospace Power Conditioning | Military Avionics Reference |
|---|---|
Use Scenario: Regulation of 28 V DC bus-derived analog references in flight control computers. IC Role / Device Role / Timing Role: Zener diode providing primary 6.8 V reference for ADC biasing and op-amp offset trimming. Use Value: Maintains <±0.5% reference stability across –55 °C to +125 °C ambient, enabling sub-12-bit measurement accuracy. |
Use Scenario: Overvoltage clamp on 15 V sensor interface lines in radar warning receivers. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting analog front-end amplifiers from induced surges. Use Value: Limits transient excursions to ≤7.5 V within 10 ns, preventing latch-up in downstream signal chain ICs. |
| Satellite Payload Biasing | Nuclear Instrumentation Supply |
Use Scenario: Stable bias generation for photomultiplier tube (PMT) dynode chains in gamma-ray spectrometers. IC Role / Device Role / Timing Role: Precision Zener reference establishing cascaded high-voltage divider ratios. Use Value: Delivers <10 ppm/°C drift and <0.1% long-term drift over 10 years, preserving energy calibration fidelity. |
Use Scenario: Voltage regulation in neutron detector high-voltage bias supplies operating inside reactor containment. IC Role / Device Role / Timing Role: Radiation-tolerant shunt regulator maintaining 6.8 V for comparator hysteresis thresholds. Use Value: Sustains regulation performance after 100 krad(Si) exposure, eliminating recalibration cycles during maintenance windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4954DUS/TR | Higher screening level (JANTXV per MIL-PRF-19500/356); tighter lot traceability and extended burn-in | Required for Class H (spaceflight) and Class K (nuclear) programs where zero-defect history is mandated | Select when full JANTXV qualification and radiation test reports are contractually required |
| 1N4954DUS/TR (non-JAN) | No military qualification; commercial-grade screening; same electrical specs and package | Suitable for industrial test equipment and non-safety-critical avionics prototypes | Select for cost-sensitive development phases where MIL-spec is not yet enforced |
Compared with JANTX1N4954DUS/TR, the JANTXV variant adds process controls for ultra-low defect rates but requires longer lead times, while the commercial 1N4954DUS/TR offers identical regulation performance without military documentation overhead.
Availability
JANTX1N4954DUS/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, military avionics reference, and nuclear instrumentation supply requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTX1N4954DUS/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 defense, aerospace, and industrial markets, with emphasis on radiation-hardened and hermetic packaging.
The JANTX1N4954DUS/TR belongs to Microsemi's MIL-PRF-19500/356-qualified Zener series, engineered specifically for voltage regulation in mission-critical systems where parametric stability under stress is non-negotiable.
FAQ
What is the Zener voltage tolerance of JANTX1N4954DUS/TR?
JANTX1N4954DUS/TR has a Zener voltage tolerance of ±1%, indicated by the "D" suffix in the part number. This corresponds to a nominal 6.8 V regulation point ranging from 6.732 V to 6.868 V at IZT = 175 mA and 25 °C ambient, verified per MIL-PRF-19500/356 test requirements.
Does JANTX1N4954DUS/TR require derating above 140 °C case temperature?
Yes, JANTX1N4954DUS/TR must be linearly derated above 140 °C case temperature (TEC), reaching zero power dissipation at 175 °C. For example, at 160 °C TEC, its usable power drops to 3.33 W. Derating follows the 7 °C/W junction-to-end-cap thermal resistance specified in the SD44A datasheet.
Is JANTX1N4954DUS/TR compatible with lead-free solder reflow profiles?
No - JANTX1N4954DUS/TR features Sn/Pb terminations and is not qualified for lead-free reflow. Its end caps use tin/lead finish, and the datasheet specifies compatibility only with eutectic solder processes. Lead-free assembly may compromise hermetic seal integrity and voidless glass bond reliability.
What is the maximum reverse leakage current for JANTX1N4954DUS/TR?
The maximum reverse leakage current for JANTX1N4954DUS/TR is 150 μA at VR = 5.2 V and 25 °C, as defined in the Electrical Characteristics table. This value remains ≤250 μA across the full –65 °C to +175 °C operating range, supporting low-power standby functionality in battery-operated systems.
Can JANTX1N4954DUS/TR be used as a replacement for axial-leaded 1N4954?
JANTX1N4954DUS/TR is not a direct replacement for axial-leaded 1N4954 due to different package geometry and thermal path. While both share identical electrical specs, the surface-mount "E" package has 7 °C/W junction-to-end-cap resistance versus ~20 °C/W for axial versions, requiring PCB layout and thermal management adjustments.
JANTX1N4954DUS/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:
- ±1%
- 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
JANTX1N4954DUS/TR FAQ
1.How can I place an order for JANTX1N4954DUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4954DUS/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 JANTX1N4954DUS/TR reliable?
The price and inventory of JANTX1N4954DUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4954DUS/TR is usually 5 days.
3.What payment methods are accepted for JANTX1N4954DUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTX1N4954DUS/TR transactions.
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4.How is shipping managed for JANTX1N4954DUS/TR?
JANTX1N4954DUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4954DUS/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 JANTX1N4954DUS/TR?
For technical support, including JANTX1N4954DUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4954DUS/TR requirements.
6.How does Aetrix verify that JANTX1N4954DUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4954DUS/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 JANTX1N4954DUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4954DUS/TR?
All JANTX1N4954DUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4954DUS/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 JANTX1N4954DUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4954DUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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