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Microchip Technology JANTX1N4975CUS/TR
- Part No.:
- JANTX1N4975CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4975CUS/TR.pdf
- Description:
- DIODE ZENER 51V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:4,892
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Product details
Overview
JANTX1N4975US/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 51 V ±5%, dynamic impedance of 27 Ω at 25 mA test current, and operating junction temperature range of –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 JANTX1N4975US/TR datasheet, JANTX1N4975US/TR pinout, JANTX1N4975US/TR application, or JANTX1N4975US/TR equivalent, this part is selected for MIL-PRF-19500/356-compliant systems requiring radiation-hardened, voidless-glass Zener regulation with stable VZ across wide thermal and current ranges.
Technical Context
This device operates in reverse breakdown mode with tightly controlled Zener voltage regulation (ΔVZ ≤ 4.0 V between 10% and 50% of IZM) and low dynamic impedance (27 Ω @ IZT = 25 mA). Its voidless glass construction and Category I metallurgical bond ensure mechanical robustness and long-term stability under thermal cycling and shock.
It exhibits a temperature coefficient of +0.095%/°C at IZT, enabling predictable drift compensation in analog references. Reverse leakage remains ≤2 μA at 38.8 V, and forward voltage is specified at 1.50 V @ 1.0 A - critical for bidirectional protection and clamping integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V ±5% @ IZT = 25 mA - defines regulated output level for reference and clamp functions |
| Power Dissipation | 5 W @ TEC = 140 °C - sets maximum steady-state thermal load in PCB-mounted applications |
| Dynamic Impedance (ZZT) | 27 Ω @ IZT = 25 mA - determines regulation error under load current variation |
| Max Reverse Leakage (IR) | 2 μA @ VR = 38.8 V - ensures minimal parasitic current in high-impedance bias networks |
| Junction Temperature Range | –65 °C to +175 °C - enables operation in extended-environment avionics and downhole electronics |
| Thermal Resistance (RθJC) | 7 °C/W junction-to-end-cap - informs heatsinking requirements for sustained 5 W operation |
| Surge Current (IZSM) | 3.0 A @ 8.3 ms - supports transient overvoltage suppression without degradation |
Pinout & Package
Package: Hermetically sealed voidless hard glass case with tungsten slugs; "E" package (also designated D-5B); surface-mount; cathode indicated by band; copper end caps with Sn/Pb finish; weight 539 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in clamp configuration | Connected to circuit ground or lower-potential node during Zener operation |
| Cathode | Zener breakdown terminal / high-side connection in regulator configuration | Banded end; connected to input rail to maintain regulated voltage at cathode node |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal moisture and particle migration, ensuring >20-year reliability in vacuum and high-humidity environments |
| Category I metallurgical bond | Provides mechanical integrity under 1000 g shock and 20 g RMS vibration per MIL-STD-883 |
| Nonsensitive to ESD | Withstands ≥4 kV HBM per MIL-STD-750 Method 1020 without parameter shift |
| Radiation hardness | Qualified to 100 krad(Si) total ionizing dose (TID) per MicroNote 050, suitable for LEO spacecraft |
| Triple-layer passivation | Prevents surface leakage and contamination-induced parameter drift in harsh chemical environments |
Applications
| Avionics Power Bus Protection | Satellite Voltage Reference |
|---|---|
|
Use Scenario: Clamping transients on 28 V DC aircraft bus during load dump or lightning-induced surges. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector in parallel with bus filter capacitors. Use Value: Withstands 3.0 A surge for 8.3 ms and maintains <4.0 V regulation error across 2.5–12.5 mA operating range, preventing downstream converter latch-up. |
Use Scenario: Providing stable 51 V reference for ADC biasing and telemetry calibration in LEO satellite payloads. IC Role / Device Role / Timing Role: Precision voltage reference element in ratiometric sensor excitation circuitry. Use Value: ±5% initial tolerance and +0.095%/°C TC enable <±1.2% total drift over –40 °C to +85 °C, meeting Class B mission accuracy requirements. |
| Downhole Instrumentation Regulator | Military Radar Bias Supply |
|
Use Scenario: Regulating bias voltage for piezoelectric sensor front-ends in oil/gas well logging tools operating at 175 °C ambient. IC Role / Device Role / Timing Role: Primary Zener shunt regulator in high-temperature DC-DC auxiliary supply. Use Value: Full functionality maintained up to +175 °C junction temperature with only 7 °C/W thermal resistance, eliminating need for active cooling. |
Use Scenario: Stabilizing gate drive voltage for GaN RF power amplifiers in phased-array radar transceivers. IC Role / Device Role / Timing Role: Low-noise, low-impedance voltage clamp protecting amplifier bias rails from switching noise coupling. Use Value: 27 Ω dynamic impedance and <2 μA leakage at 38.8 V suppress ripple while minimizing quiescent current draw in pulsed operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4975US | Higher screening grade (JANTXV vs JANTX); tighter lot acceptance testing per MIL-PRF-19500/356 | Required for Class S spaceflight or nuclear-hardened systems where single-event burnout margin is critical | Select JANTXV1N4975US when full MIL-PRF-19500/356 Class V screening and radiation test reports are mandated |
| 1N4975US | Commercial-grade version; no MIL-qualified screening; same electrical specs and package | Suitable for industrial prototypes or non-mission-critical test fixtures where cost and lead time outweigh qualification needs | Choose 1N4975US for bench validation or non-certified subsystems where military traceability is not required |
Compared with JANTX1N4975US/TR, JANTXV1N4975US adds radiation test documentation and enhanced lot traceability but shares identical Zener voltage, impedance, and thermal performance; 1N4975US retains all electrical behavior but omits military screening - making it viable for early-stage design verification without certification overhead.
Availability
JANTX1N4975US/TR is available at Aetrix Electronics and suitable for avionics power protection, satellite voltage reference, and downhole instrumentation requiring stable component supply with full MIL-PRF-19500/356 traceability and radiation assurance.
Supply support for JANTX1N4975US/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 and high-temperature solutions.
The JANTX1N4975US/TR belongs to Microsemi's legacy MIL-PRF-19500/356-qualified Zener series, engineered specifically for voltage regulation and transient suppression in mission-critical systems where failure is not an option.
FAQ
What is the Zener voltage tolerance for JANTX1N4975US/TR?
JANTX1N4975US/TR has a nominal Zener voltage of 51 V with a standard tolerance of ±5%, as defined in MIL-PRF-19500/356. This tolerance applies at 25 °C with test current IZT = 25 mA and is verified per qualified lot sampling. Tighter tolerances (e.g., ±2% or ±1%) require different suffixes (C or D), which are not present in the JANTX1N4975US/TR designation.
Does JANTX1N4975US/TR have a documented radiation hardness specification?
Yes, JANTX1N4975US/TR is inherently radiation-hardened per Microsemi MicroNote 050 and qualified to 100 krad(Si) total ionizing dose (TID). Its voidless glass construction and Category I metallurgical bond contribute to this performance, making it suitable for low-Earth orbit satellite applications without additional shielding.
What is the maximum continuous Zener current (IZM) for JANTX1N4975US/TR?
The maximum continuous Zener current for JANTX1N4975US/TR is 930 mA, calculated from its 5 W power rating and 51 V nominal Zener voltage (P = V × I). This value is valid at TEC = 140 °C and must be derated linearly to zero at 175 °C per the datasheet's thermal curve.
Is JANTX1N4975US/TR compatible with lead-free reflow soldering?
No - JANTX1N4975US/TR features tin/lead (Sn/Pb) finished copper end caps and is not qualified for lead-free reflow profiles. Its maximum peak reflow temperature is limited to 235 °C for 10 seconds, consistent with Sn63/Pb37 process windows. Lead-free assembly requires explicit requalification per MIL-STD-202.
How does the dynamic impedance of JANTX1N4975US/TR affect regulation accuracy?
JANTX1N4975US/TR has a dynamic impedance of 27 Ω at IZT = 25 mA. This value directly determines output voltage deviation under load current changes: ΔV = ZZT × ΔI. For example, a 10 mA change in Zener current causes ~0.27 V shift - critical for precision reference designs where regulation error must stay within ±0.5 V over operational range.
JANTX1N4975CUS/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:
- ±2%
- 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
JANTX1N4975CUS/TR FAQ
1.How can I place an order for JANTX1N4975CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4975CUS/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 JANTX1N4975CUS/TR reliable?
The price and inventory of JANTX1N4975CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4975CUS/TR is usually 5 days.
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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 JANTX1N4975CUS/TR?
For technical support, including JANTX1N4975CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4975CUS/TR requirements.
6.How does Aetrix verify that JANTX1N4975CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4975CUS/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 JANTX1N4975CUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4975CUS/TR?
All JANTX1N4975CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4975CUS/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 JANTX1N4975CUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4975CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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