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Microchip Technology JANTX1N4975DUS/TR
- Part No.:
- JANTX1N4975DUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4975DUS/TR.pdf
- Description:
- DIODE ZENER 51V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:5,862
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Product details
Overview
JANTX1N4975DUS/TR from Microsemi is a military-qualified, voidless hermetically sealed surface-mount 5 W Zener diode with nominal Zener voltage of 51 V, ±5% tolerance, 27 Ω dynamic impedance at 25 mA test current, and rated for operation from –65 °C to +175 °C - used in high-reliability voltage regulation and reference circuits for aerospace power conditioning and radiation-hardened instrumentation.
For engineers reviewing the JANTX1N4975DUS/TR datasheet, JANTX1N4975DUS/TR pinout, JANTX1N4975DUS/TR application, or JANTX1N4975DUS/TR equivalent, this page delivers verified electrical specs, MIL-PRF-19500/356 qualification status, thermal resistance (10 °C/W), surge current rating (3.0 A @ 8.3 ms), and hermetic glass package details essential for mission-critical design validation.
Technical Context
This device belongs to the JANTX-grade 1N4954US–1N4996US series, featuring voidless hard-glass construction with tungsten slugs and copper end caps with Sn/Pb finish. It employs Category I internal metallurgical bonds per MIL-PRF-19500/356 and exhibits low temperature coefficient (±0.095 %/°C) and robust ESD immunity per MIL-STD-750 Method 1020.
Designed for stable regulation across wide current (10–50% IZM) and temperature ranges, it delivers 51 V Zener voltage at 25 mA IZT with 27 Ω dynamic impedance and maintains ≤4.0 V voltage regulation (ΔVZ) between 10% and 50% of maximum Zener current (IZM = 930 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V at 25 mA test current - defines precise regulation point for feedback loops in DC-DC converters and precision references. |
| Power Dissipation | 5 W @ TEC = 125 °C - requires heatsinking or board-level thermal management above ambient to sustain full rating. |
| Dynamic Impedance (ZZ) | 27 Ω at IZT = 25 mA - determines output voltage stability under load transients; lower value improves regulation fidelity. |
| Max Reverse Leakage (IR) | 2 μA at VR = 38.8 V - ensures minimal quiescent current draw in standby or low-power bias networks. |
| Thermal Resistance (RθJ-EC) | 10 °C/W junction-to-end-cap - enables thermal modeling for PCB pad layout and reliability prediction under sustained power dissipation. |
| Surge Current (IZSM) | 3.0 A peak @ 8.3 ms half-sine - supports transient overvoltage clamping without degradation in pulse-loaded systems. |
| Temp Coefficient (αVZ) | ±0.095 %/°C - allows accurate voltage drift estimation over –65 °C to +175 °C operating range for flight-critical designs. |
Pinout & Package
Package: Hermetically sealed voidless hard-glass "E" package (also designated D-5B), with cathode indicated by band, copper end caps with Sn/Pb finish, and weight of 539 mg. Tape-and-reel compliant per EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential node in reverse-biased Zener configuration; carries full regulator current during operation. |
| Cathode | Zener breakdown terminal | Marked with band; connected to regulated voltage node; sustains 51 V reverse bias and dissipates up to 5 W in regulation mode. |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/356 Qualified | JANTX grade ensures screening, testing, and traceability per military specification - mandatory for spaceflight and defense avionics. |
| Voidless Hermetic Glass | Eliminates internal delamination risk under thermal cycling and vacuum exposure - critical for long-term reliability in orbital environments. |
| Category I Metallurgical Bond | Guarantees mechanical integrity of internal die attach under shock/vibration - validated for launch vehicle and missile guidance systems. |
| Nonsensitive to ESD | Passes MIL-STD-750 Method 1020 - enables safe handling and assembly without special grounding protocols in cleanroom production. |
| Radiation Hardness | Inherently tolerant to total ionizing dose (TID) per MicroNote 050 - suitable for unhardened satellite subsystems requiring >100 krad(Si) resilience. |
Applications
| Aerospace Power Conditioning | Defense Avionics Reference |
|---|---|
Use Scenario: Regulating auxiliary 51 V rail in satellite power distribution units exposed to thermal vacuum and radiation. IC Role / Device Role / Timing Role: Zener voltage reference and overvoltage clamp in isolated DC-DC converter feedback network. Use Value: Maintains ±0.5% output accuracy over –65 °C to +125 °C with <27 Ω dynamic impedance, ensuring stable bus regulation despite solar array transients. |
Use Scenario: Providing stable 51 V reference for analog-to-digital conversion in radar receiver front-ends. IC Role / Device Role / Timing Role: Precision shunt reference for ADC biasing and calibration circuitry in airborne electronic warfare systems. Use Value: Delivers <2 μA leakage at 38.8 V and ±0.095 %/°C tempco - enabling sub-LSB measurement stability across operational temperature extremes. |
| Missile Guidance Sensors | Nuclear Instrumentation |
Use Scenario: Biasing high-voltage photomultiplier tubes in inertial navigation sensor modules subjected to high-G launch profiles. IC Role / Device Role / Timing Role: High-reliability Zener clamp protecting PMT anode supply from ESD and switching surges. Use Value: Withstands 3.0 A surge current at 8.3 ms and passes MIL-STD-750 ESD testing - preventing false triggers during vibration-induced arcing. |
Use Scenario: Establishing calibrated 51 V threshold in radiation monitoring detectors deployed in reactor containment zones. IC Role / Device Role / Timing Role: Radiation-hardened voltage reference for pulse-height discrimination in scintillation counters. Use Value: Inherent TID hardness (>100 krad) and hermetic seal prevent parameter shift or leakage increase after prolonged neutron/gamma 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 |
|---|---|---|---|
| 1N4975US | Commercial-grade version; same 51 V VZ, 27 Ω ZZ, and D-5B package but lacks MIL-PRF-19500/356 screening and JANTX qualification. | Approved only for non-military industrial use; not permitted in DoD or NASA BOMs requiring JANTX traceability. | Select when cost sensitivity outweighs formal qualification requirements and radiation/ESD performance is secondary. |
| JANTXV1N4975DUS/TR | Higher-screened JANTXV grade with extended temperature testing (–65 °C to +175 °C) and tighter lot acceptance criteria per MIL-PRF-19500/356. | Required for Class S (space-qualified) and critical flight hardware where failure modes demand zero latent defects. | Choose when system-level reliability mandates enhanced screening beyond JANTX, especially for launch-critical subsystems. |
Compared with JANTX1N4975DUS/TR, 1N4975US omits military screening and traceability while retaining identical electrical behavior, whereas JANTXV1N4975DUS/TR adds rigorous environmental stress screening - making the former suitable for cost-driven prototypes and the latter for human-rated spacecraft avionics.
Availability
JANTX1N4975DUS/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, defense avionics reference, and missile guidance sensor applications requiring stable component supply with full MIL-PRF-19500/356 documentation and traceable lot history.
Supply support for JANTX1N4975DUS/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 manufacturer specializing in high-reliability, radiation-hardened, and military-grade analog and discrete components.
The JANTX1N4975DUS/TR belongs to Microsemi's legacy 1N49xxUS Zener series - engineered specifically for mission-critical voltage regulation in aerospace, defense, and nuclear instrumentation where hermeticity, temperature resilience, and qualification compliance are non-negotiable.
FAQ
What is the Zener voltage tolerance for JANTX1N4975DUS/TR?
JANTX1N4975DUS/TR has a nominal Zener voltage of 51 V with a standard tolerance of ±5%, consistent with the "no suffix" designation in the 1N4954US–1N4996US family. Tighter tolerances (e.g., ±2% or ±1%) require C or D suffixes, which do not apply to this specific JANTX-grade part.
Is JANTX1N4975DUS/TR compatible with lead-free solder reflow processes?
JANTX1N4975DUS/TR features copper end caps with Sn/Pb finish and is not qualified for lead-free reflow. Its specified thermal profile assumes tin-lead eutectic solder; use with Pb-free processes may compromise hermetic seal integrity and voidless glass bond reliability.
Does JANTX1N4975DUS/TR meet radiation hardness requirements for space applications?
Yes - JANTX1N4975DUS/TR is inherently radiation-hardened per Microsemi MicroNote 050, demonstrating resilience to total ionizing dose (TID) levels exceeding 100 krad(Si), making it suitable for low-earth orbit and deep-space instrument subsystems without additional shielding.
What is the maximum continuous Zener current (IZM) for JANTX1N4975DUS/TR?
The maximum continuous Zener current for JANTX1N4975DUS/TR is 930 mA at TEC = 125 °C, derived from its 5 W power rating and 51 V Zener voltage (P = VZ × IZM). Derating is linear above 125 °C to zero at 175 °C per datasheet specifications.
How is polarity identified on JANTX1N4975DUS/TR?
JANTX1N4975DUS/TR uses a cathode band marking on the glass body to indicate polarity. The banded end is the cathode and must be connected to the higher-potential node in standard reverse-biased Zener regulation configurations.
JANTX1N4975DUS/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):
- 51 V
- Tolerance:
- ±1%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 27 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 38.8 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
JANTX1N4975DUS/TR FAQ
1.How can I place an order for JANTX1N4975DUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4975DUS/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 JANTX1N4975DUS/TR reliable?
The price and inventory of JANTX1N4975DUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4975DUS/TR is usually 5 days.
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Once your JANTX1N4975DUS/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 JANTX1N4975DUS/TR?
For technical support, including JANTX1N4975DUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4975DUS/TR requirements.
6.How does Aetrix verify that JANTX1N4975DUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4975DUS/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 JANTX1N4975DUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4975DUS/TR?
All JANTX1N4975DUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4975DUS/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 JANTX1N4975DUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4975DUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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