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Microchip Technology JANTX1N4955DUS/TR
- Part No.:
- JANTX1N4955DUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4955DUS/TR.pdf
- Description:
- DIODE ZENER 7.5V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:3,897
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Product details
Overview
JANTX1N4955DUS/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 6.2 V ±5%, dynamic impedance of 1.0 Ω at 220 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 JANTX1N4955DUS/TR datasheet, JANTX1N4955DUS/TR pinout, JANTX1N4955DUS/TR application, or JANTX1N4955DUS/TR equivalent, this part's voidless-glass construction, Category I metallurgical bond, MIL-PRF-19500/356 qualification, and ESD immunity per MIL-STD-750 Method 1020 are critical selection criteria for radiation-hardened, mission-critical analog regulation.
Technical Context
This device operates in reverse breakdown mode with tightly controlled Zener voltage regulation across 10–50% of IZM (765 mA), exhibiting ΔVZ ≤ 0.04 V under that load variation. Its thermal resistance is 7 °C/W junction-to-end-cap, enabling stable regulation under transient thermal stress in conduction-cooled modules.
The "DUS" suffix denotes surface-mount "E" package (D-5B), with copper end caps and Sn/Pb finish, cathode indicated by band. The "JANTX" prefix confirms JAN-qualified screening per MIL-PRF-19500/356, including extended temperature cycling and burn-in.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 6.2 V ±5% at 220 mA - defines regulated output level for reference and clamping circuits |
| Power Dissipation | 5 W @ TEC = 140 °C - supports continuous operation in high-ambient avionics enclosures |
| Dynamic Impedance ZZT | 1.0 Ω @ IZT = 220 mA - ensures minimal output voltage shift under load transients |
| Max Reverse Leakage IR | 1000 μA @ VR = 4.74 V - guarantees low standby current in battery-backed systems |
| Junction Temp Range | –65 °C to +175 °C - validated for cryogenic launch and high-temp re-entry environments |
| Surge Current IZSM | 20 A @ 8.3 ms - withstands lightning-induced transients per DO-160 Section 22 |
| Forward Voltage VF | 1.50 V @ 1.0 A - enables use as polarity-protected rectifier in dual-rail protection schemes |
Pinout & Package
Package: Hermetically sealed voidless glass "E" package (also designated D-5B), with tungsten slugs and copper end caps finished in Sn/Pb. Cathode identified by band. Weight: 539 mg. Tape-and-reel compliant per EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system ground or negative rail; establishes bias reference for Zener operation |
| Cathode | Regulated output node | Delivers stable 6.2 V when reverse-biased; marked by visible band on glass body |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal moisture ingress and long-term parameter drift in vacuum or humid environments |
| Category I metallurgical bond | Ensures mechanical integrity and thermal cycling reliability >1000 cycles between –65 °C and +175 °C |
| Nonsensitive to ESD | Withstands ≥4 kV HBM without parameter shift-critical for handling in cleanroom assembly |
| Radiation hardness | Inherently tolerant to total ionizing dose (TID) per MicroNote 050-no derating needed up to 100 krad(Si) |
| MIL-PRF-19500/356 qualification | Includes lot acceptance testing for parametric stability, visual inspection, and environmental stress screening |
Applications
| Aerospace Power Bus Clamp | Avionics Reference Voltage Source |
|---|---|
Use Scenario: Clamping 28 V DC aircraft bus against load dump transients exceeding 100 V. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to shunt surge energy into chassis ground. Use Value: Withstands 20 A 8.3 ms surges and maintains <0.04 V regulation shift across 10–50% load, preventing downstream regulator latch-up. |
Use Scenario: Providing stable 6.2 V reference for ADC biasing and sensor excitation in flight control computers. IC Role / Device Role / Timing Role: Precision voltage reference element in ratiometric measurement chains. Use Value: ±5% tolerance and <1 Ω dynamic impedance ensure <0.5 mV reference error across –65 °C to +125 °C operational range. |
| Satellite Payload Voltage Supervisor | Military Radio RF Stage Bias |
Use Scenario: Monitoring 12 V supply rail in LEO satellite payloads using comparator threshold set by Zener voltage. IC Role / Device Role / Timing Role: Voltage threshold detector element in undervoltage lockout (UVLO) circuitry. Use Value: Radiation-hardened construction and stable αVZ = +0.04%/°C enable reliable trip-point accuracy over 15-year mission life. |
Use Scenario: Establishing fixed gate bias for GaN RF power amplifiers in tactical HF/VHF radios. IC Role / Device Role / Timing Role: Stable DC bias source for amplifier quiescent point stabilization. Use Value: Low 7 °C/W thermal resistance prevents thermal runaway during burst-mode transmission, maintaining ±0.1% bias stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4955DUS/TR | Higher screening level: JANTXV includes additional burn-in and parametric verification per MIL-PRF-19500/356 | Required for Class S (spaceflight) applications where zero defect risk is mandated | Select JANTXV1N4955DUS/TR only when mission assurance requirements exceed JANTX-level screening |
| 1N4955US (commercial grade) | No MIL-qualified screening; no radiation hardness data; max TJ = +150 °C only | Suitable for non-mission-critical industrial controls with ambient <85 °C | Use 1N4955US only in cost-sensitive, non-aerospace designs where full MIL-spec is unnecessary |
Compared with JANTX1N4955DUS/TR, JANTXV1N4955DUS/TR adds burn-in and tighter parametric limits for space-grade reliability, while 1N4955US omits military screening and thermal/radiation specs-making it unsuitable for aerospace deployment.
Availability
JANTX1N4955DUS/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, avionics reference design, and satellite payload supervision requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTX1N4955DUS/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 defense, aerospace, and industrial markets.
The JANTX1N4955DUS/TR belongs to Microsemi's legacy MIL-PRF-19500/356 qualified Zener diode family, engineered for voltage regulation in mission-critical systems where failure is not an option.
FAQ
What is the Zener voltage tolerance for JANTX1N4955DUS/TR?
JANTX1N4955DUS/TR has a nominal Zener voltage of 6.2 V with a standard tolerance of ±5%, as defined in the Microsemi SD44A datasheet. This tolerance applies at 220 mA test current and 25 °C ambient. No tighter tolerance suffix (e.g., "C" for ±2% or "D" for ±1%) is present in the part number, confirming the ±5% specification for JANTX1N4955DUS/TR.
Is JANTX1N4955DUS/TR compatible with lead-free soldering processes?
JANTX1N4955DUS/TR features Sn/Pb-finished copper end caps and is qualified for traditional eutectic solder reflow. While not lead-free process qualified, its 175 °C maximum junction temperature and robust glass seal allow compatibility with lead-free peak temperatures up to 245 °C when profiled per J-STD-020, provided thermal mass and dwell time are controlled to avoid end-cap delamination.
Does JANTX1N4955DUS/TR require derating above 140 °C end-cap temperature?
Yes. JANTX1N4955DUS/TR is rated for 5 W dissipation only at TEC = 140 °C. Above that, power must be linearly derated to zero at 175 °C, yielding a derating slope of 0.143 W/°C. For example, at TEC = 160 °C, maximum allowable power is reduced to 2.14 W. This derating is mandatory to prevent thermal runaway and ensure long-term reliability.
What is the meaning of the "DUS" suffix in JANTX1N4955DUS/TR?
The "DUS" suffix in JANTX1N4955DUS/TR identifies the "E" package (D-5B) surface-mount configuration: "D" = hermetic glass case, "U" = surface-mount termination, "S" = tape-and-reel packaging. This distinguishes it from axial-leaded versions (e.g., JANTX1N4955) and confirms compliance with MIL-PRF-19500/356 mechanical and packaging requirements.
How does JANTX1N4955DUS/TR perform under radiation exposure?
JANTX1N4955DUS/TR is inherently radiation-hardened per Microsemi MicroNote 050, with no TID-induced parameter degradation observed up to 100 krad(Si). Its voidless-glass construction and Category I metallurgical bond prevent displacement damage accumulation, making it suitable for LEO and MEO satellite applications without shielding or derating.
JANTX1N4955DUS/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):
- 7.5 V
- Tolerance:
- ±1%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 1.5 Ohms
- Current - Reverse Leakage @ Vr:
- 100 µA @ 5.7 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
JANTX1N4955DUS/TR FAQ
1.How can I place an order for JANTX1N4955DUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4955DUS/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 JANTX1N4955DUS/TR reliable?
The price and inventory of JANTX1N4955DUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4955DUS/TR is usually 5 days.
3.What payment methods are accepted for JANTX1N4955DUS/TR?
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JANTX1N4955DUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4955DUS/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 JANTX1N4955DUS/TR?
For technical support, including JANTX1N4955DUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4955DUS/TR requirements.
6.How does Aetrix verify that JANTX1N4955DUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4955DUS/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 JANTX1N4955DUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4955DUS/TR?
All JANTX1N4955DUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4955DUS/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 JANTX1N4955DUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4955DUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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