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Microchip Technology JANTXV1N4974CUS/TR
- Part No.:
- JANTXV1N4974CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTXV1N4974CUS/TR.pdf
- Description:
- DIODE ZENER 47V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:8,121
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Product details
Overview
JANTXV1N4974CUS/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 47 V ±1% (C suffix), dynamic impedance 25 Ω at 25 mA test current, and operating junction temperature range −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 JANTXV1N4974CUS/TR datasheet, JANTXV1N4974CUS/TR pinout, JANTXV1N4974CUS/TR application, or JANTXV1N4974CUS/TR equivalent, key selection criteria include its MIL-PRF-19500/356 qualification, voidless-glass hermetic seal, Category I metallurgical bond, −65 °C to +175 °C operation, and 1% voltage tolerance - critical for radiation-hardened and extended-temperature avionics designs.
Technical Context
This device operates in reverse-bias breakdown mode with tightly controlled Zener voltage regulation across 10–50% of IZM (100 mA to 500 mA), exhibiting ΔVZ ≤ 0.35 V over that current range. Its thermal resistance is 7 °C/W junction-to-end-cap, enabling stable regulation under transient thermal loads in conduction-cooled modules.
The "E" package (D-5B) uses tungsten slugs and copper end caps with Sn/Pb finish, supporting EIA-481-B tape-and-reel delivery. Polarity is marked by cathode band; no surface marking is applied per specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 47 V ±1% at 25 mA - enables precise 47 V rail clamping or reference generation with minimal calibration drift. |
| Power Dissipation | 5 W @ TEC = 140 °C - supports continuous regulation in high-ambient industrial or avionics enclosures without forced cooling. |
| Dynamic Impedance ZZT | 25 Ω @ IZT = 25 mA - ensures low output impedance for stable voltage regulation under varying load currents. |
| Max Reverse Leakage IR | 2 μA @ VR = 35.8 V - guarantees negligible standby current in battery-backed or low-power hold-up circuits. |
| Junction Temperature Range | −65 °C to +175 °C - validated for operation in space-grade thermal cycling and jet engine bay environments. |
| Surge Current IZSM | 5.5 A @ 8.3 ms - withstands lightning-induced transients and inductive switch-off spikes in DC power distribution. |
| Thermal Resistance θJC | 7 °C/W junction-to-end-cap - allows direct thermal path to heatsink or PCB copper pour for predictable derating. |
Pinout & Package
Package: Hermetically sealed voidless glass "E" package (JEDEC D-5B), with tungsten slugs and copper end caps finished in Sn/Pb. Cathode indicated by band. Weight: 539 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node; carries full surge current during forward conduction (VF ≤ 1.5 V @ 1 A). |
| Cathode | Zener breakdown terminal | Connected to regulated voltage rail; defines Zener voltage polarity and provides reference point for feedback loops. |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal moisture and particle migration, ensuring >20-year reliability in vacuum or high-humidity mission profiles. |
| Category I metallurgical bond | Guarantees mechanical integrity under shock/vibration up to 100 g, required for launch vehicle electronics. |
| MIL-PRF-19500/356 qualification | Validated screening includes burn-in, temperature cycling, and lot acceptance testing per military standard. |
| Nonsensitive to ESD | Withstands ≥4 kV HBM per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in board layout. |
| Radiation hardness | Inherently tolerant to total ionizing dose (TID) per MicroNote 050 - suitable for low-earth orbit satellite power systems. |
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 acting as shunt regulator and transient voltage suppressor. Use Value: Limits bus voltage to ≤47.5 V during 5.5 A, 8.3 ms surges without degradation, preserving downstream FPGAs and ADCs. | Use Scenario: Providing stable 47 V reference for analog-to-digital conversion in flight control sensor signal conditioning. IC Role / Device Role / Timing Role: Precision voltage reference element in ratiometric measurement circuitry. Use Value: Delivers ±1% initial accuracy and <0.1%/°C tempco over −55 °C to +125 °C, enabling sub-0.5% system-level measurement error. |
| Satellite Power Converter Feedback | Tactical Radio DC-DC Isolation Barrier |
Use Scenario: Regulating isolated 47 V auxiliary rail in radiation-hardened DC-DC converter feedback loop. IC Role / Device Role / Timing Role: Zener reference in optocoupler-coupled feedback path. Use Value: Maintains regulation stability despite 100 krad(Si) TID exposure, avoiding closed-loop drift in LEO missions. | Use Scenario: Establishing galvanically isolated bias voltage for RF power amplifier stages in manpack radios. IC Role / Device Role / Timing Role: High-reliability voltage clamp on isolated secondary side. Use Value: Survives −65 °C cold soak and 175 °C solder reflow without parametric shift, ensuring field-deployable ruggedness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4974US/TR | Same 47 V nominal rating but ±5% tolerance (no suffix); higher ZZT = 35 Ω at 25 mA. | Acceptable where tighter voltage accuracy is not required; lower cost for non-critical rails. | Select when budget constraints outweigh need for 1% regulation in non-safety-critical subsystems. |
| JANS1N4974CUS/TR | Same 47 V ±1%, but qualified to JANS level (higher screening, extended temperature validation). | Required for manned spacecraft and nuclear command systems where zero-failure probability is mandated. | Choose only when JANS certification documentation and extended test reports are contractually required. |
Compared with JANTXV1N4974US/TR, the JANTXV1N4974CUS/TR offers superior voltage accuracy and lower dynamic impedance for precision regulation, while JANS1N4974CUS/TR adds deeper screening for ultra-high-assurance programs - making the JANTXV1N4974CUS/TR the optimal balance of performance, qualification, and cost for most defense avionics.
Availability
JANTXV1N4974CUS/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, avionics reference design, and radiation-hardened DC-DC converter development requiring stable component supply across long production lifecycles.
Supply support for JANTXV1N4974CUS/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, radiation-tolerant, and military-qualified analog and mixed-signal components.
The 1N49xxUS series was designed specifically for high-reliability surface-mount Zener regulation in aerospace, defense, and space applications where hermetic sealing, extreme temperature operation, and MIL-spec qualification are mandatory.
FAQ
What is the Zener voltage tolerance of JANTXV1N4974CUS/TR?
JANTXV1N4974CUS/TR has a nominal Zener voltage of 47 V with ±1% tolerance, indicated by the "C" suffix per Microsemi's naming convention. This tolerance is verified at 25 °C and maintained across the full −65 °C to +175 °C operating range per MIL-PRF-19500/356 screening. The JANTXV1N4974CUS/TR achieves this tight tolerance via post-trim characterization and lot-level statistical process control.
Is JANTXV1N4974CUS/TR compatible with lead-free solder reflow profiles?
JANTXV1N4974CUS/TR features Sn/Pb finish on its copper end caps and is qualified for traditional eutectic soldering. While it can survive peak temperatures up to 225 °C, Microsemi does not specify compatibility with Pb-free reflow profiles (e.g., JEDEC J-STD-020). For lead-free assembly, JANTXV1N4974CUS/TR requires process validation including wetting tests and intermetallic inspection - consult Microchip's obsolescence notice SD44A for legacy finish guidance.
What is the maximum continuous Zener current for JANTXV1N4974CUS/TR?
The maximum continuous Zener current (IZM) for JANTXV1N4974CUS/TR is 100 mA at TEC = 140 °C, derived from its 5 W power rating and 47 V nominal voltage (P = V × I → I = 5 W / 47 V ≈ 106 mA, derated to 100 mA for margin). This value is confirmed in the Electrical Characteristics table on page 2 of SD44A.pdf and applies only when mounted to a thermally adequate end-cap heatsink.
Does JANTXV1N4974CUS/TR have a cathode band marking?
Yes, JANTXV1N4974CUS/TR uses a visible cathode band to indicate polarity, as stated in the Mechanical and Packaging section of the datasheet. The band is applied directly on the voidless glass body and is the sole polarity identifier - no alphanumeric marking is present on the device surface per specification.
How does the thermal resistance of JANTXV1N4974CUS/TR compare to axial-leaded equivalents?
JANTXV1N4974CUS/TR has a junction-to-end-cap thermal resistance of 7 °C/W, optimized for conduction cooling via its metal end caps. Axial-leaded equivalents (e.g., JANTXV1N4974CUS) exhibit higher thermal resistance due to wire leads acting as thermal bottlenecks; their θJC is typically >20 °C/W. This makes JANTXV1N4974CUS/TR preferable for high-power-density layouts where thermal path efficiency is critical.
JANTXV1N4974CUS/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):
- 47 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 35.8 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
JANTXV1N4974CUS/TR FAQ
1.How can I place an order for JANTXV1N4974CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTXV1N4974CUS/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 JANTXV1N4974CUS/TR reliable?
The price and inventory of JANTXV1N4974CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTXV1N4974CUS/TR is usually 5 days.
3.What payment methods are accepted for JANTXV1N4974CUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTXV1N4974CUS/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANTXV1N4974CUS/TR?
JANTXV1N4974CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTXV1N4974CUS/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 JANTXV1N4974CUS/TR?
For technical support, including JANTXV1N4974CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTXV1N4974CUS/TR requirements.
6.How does Aetrix verify that JANTXV1N4974CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTXV1N4974CUS/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 JANTXV1N4974CUS/TR meets industry standards.
7.What is the process for return or replacement of JANTXV1N4974CUS/TR?
All JANTXV1N4974CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTXV1N4974CUS/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 JANTXV1N4974CUS/TR part is unused and in its original packaging.
Return procedure for JANTXV1N4974CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
JANTXV1N4974CUS/TR Tags
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