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Microchip Technology JANTX1N4974CUS/TR
- Part No.:
- JANTX1N4974CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4974CUS/TR.pdf
- Description:
- DIODE ZENER 47V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:7,646
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Product details
Overview
JANTX1N4974CUS/TR from Microsemi is a military-qualified, voidless hermetically sealed glass Zener diode rated for 5 W power dissipation at TEC = 140 °C, with nominal Zener voltage 47 V ±1% (C suffix), dynamic impedance 25 Ω at IZT = 25 mA, and operating junction temperature range −65 °C to +175 °C. It serves as a precision voltage reference and regulation element in high-reliability power conditioning circuits.
For engineers reviewing the JANTX1N4974CUS/TR datasheet, JANTX1N4974CUS/TR pinout, JANTX1N4974CUS/TR application, or JANTX1N4974CUS/TR equivalent, this part is selected for mission-critical voltage stabilization where ESD immunity (MIL-STD-750 Method 1020), radiation hardness, and long-term parametric stability under thermal cycling are mandatory design requirements.
Technical Context
This device belongs to the MIL-PRF-19500/356 qualified 1N4954US–1N4996US series, featuring Category I internal metallurgical bonds and triple-layer passivation for enhanced reliability. Its Zener breakdown mechanism delivers stable regulation across 10%–50% of IZM, with ΔVZ ≤ 0.8 V over that current range.
The "E" package (D-5B) uses tungsten slugs and copper end caps with Sn/Pb finish, enabling surface-mount reflow compatibility while maintaining hermeticity. Thermal resistance is 7 °C/W junction-to-end-cap, supporting operation up to 175 °C with linear derating above 140 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 47 V ±1% at IZT = 25 mA - enables precise 47 V reference generation with tight tolerance for calibration-critical systems |
| Power Dissipation | 5 W @ TEC = 140 °C - supports sustained regulation in compact, high-temperature environments without forced cooling |
| Dynamic Impedance ZZT | 25 Ω @ IZT = 25 mA - ensures low output impedance for effective ripple suppression in analog supply rails |
| Max Reverse Leakage IR | 2 μA @ VR = 35.8 V - guarantees minimal standby current draw in battery-backed or low-power hold-up circuits |
| Thermal Resistance θJC | 7 °C/W junction-to-end-cap - allows accurate thermal modeling for PCB pad layout and heatsinking design |
| Operating Temperature | −65 °C to +175 °C - validated for aerospace, downhole, and defense electronics exposed to extreme ambient conditions |
| Forward Voltage VF | 1.50 V @ 1.0 A - defines forward conduction loss during transient polarity reversal or crowbar protection use cases |
Pinout & Package
Package: Hermetically sealed voidless hard glass "E" package (also designated D-5B), with copper end caps and Sn/Pb finish. Cathode indicated by band. No marking on body. Weight: 539 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to cathode of upstream regulator or ground return path | Must be routed to lowest-impedance ground plane to minimize noise coupling into Zener regulation node |
| Cathode | Regulated output node in reverse bias; referenced to system ground or supply rail | Direct connection point for feedback networks and load decoupling capacitors; band-marked for orientation verification |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass construction | Eliminates moisture ingress and internal delamination risk over 20+ year field life in humid or vacuum environments |
| Category I metallurgical bond | Ensures mechanical integrity and electrical continuity between die and slug under shock/vibration per MIL-STD-883 |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Enables handling and assembly without special grounding protocols or ionized air systems |
| Inherent radiation hardness | Validated per MicroNote 050 for total ionizing dose (TID) tolerance >100 krad(Si), suitable for space-grade applications |
| Tape-and-reel packaging (EIA-481-B) | Supports automated SMT placement with verified feed reliability and component orientation consistency |
Applications
| Aerospace Power Conditioning | Downhole Instrumentation Reference |
|---|---|
Use Scenario: Regulating auxiliary 47 V bias rail in satellite power management units exposed to thermal cycling and radiation. IC Role / Device Role / Timing Role: Precision voltage reference for ADC reference buffers and op-amp biasing networks. Use Value: Maintains <±0.1% VZ drift over −55 °C to +125 °C, ensuring measurement accuracy without recalibration. |
Use Scenario: Providing stable 47 V reference in high-temperature logging tools deployed at 175 °C wellbore environments. IC Role / Device Role / Timing Role: Primary voltage clamp and regulation element in isolated sensor excitation circuitry. Use Value: Operates continuously at 175 °C with no parameter shift beyond spec limits, eliminating need for active thermal compensation. |
| Military Avionics Hold-Up | Radiation-Hardened Test Equipment |
Use Scenario: Back-up voltage regulation during main supply transients in flight control computers. IC Role / Device Role / Timing Role: Standby Zener shunt regulator activated via crowbar circuit during brownout events. Use Value: Withstands 20 A surge current (8.3 ms) without degradation, preserving system integrity during fault recovery. |
Use Scenario: Calibration reference source in portable radiation survey meters requiring traceable stability. IC Role / Device Role / Timing Role: Primary DC reference generator for analog front-end gain and offset trimming. Use Value: Delivers <10 ppm/°C tempco and <0.01% long-term drift, meeting ANSI N42.33 metrology requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4974CUS/TR | Higher screening level (JANTXV per MIL-PRF-19500/356); tighter lot acceptance testing and extended burn-in | Required for Class H (spaceflight) and Class K (nuclear) programs where zero-defect reliability is mandated | Select when full MIL-PRF-19500/356 JANTXV qualification and 100% lot testing are contractually required |
| 1N4974US | Commercial-grade version; no military screening, wider VZ tolerance (±5%), and no radiation hardness documentation | Suitable only for non-safety-critical industrial controls or lab equipment with benign environmental profiles | Choose only for cost-sensitive prototyping or non-mission-critical applications where MIL-spec is not enforced |
Compared with JANTX1N4974CUS/TR, JANTXV1N4974CUS/TR adds screening rigor for ultra-high-reliability deployment, while 1N4974US omits military qualification entirely-making the JANTX variant the optimal balance of assured performance and procurement accessibility for defense and aerospace programs.
Availability
JANTX1N4974CUS/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, downhole instrumentation reference, and military avionics hold-up requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for JANTX1N4974CUS/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.
The JANTX1N4974CUS/TR belongs to Microsemi's MIL-PRF-19500/356 qualified Zener diode family, engineered specifically for voltage regulation in mission-critical systems where failure is not an option.
FAQ
What is the Zener voltage tolerance for JANTX1N4974CUS/TR?
JANTX1N4974CUS/TR has a Zener voltage tolerance of ±1%, indicated by the "C" suffix in the part number. This is confirmed in the Electrical Characteristics table on page 2 of the SD44A datasheet, where VZ = 47 V at IZT = 25 mA with ΔVZ ≤ 0.8 V across 10–50% of IZM. The tighter tolerance supports precision reference applications where standard ±5% parts would introduce unacceptable error.
Does JANTX1N4974CUS/TR require derating above 140 °C?
Yes, JANTX1N4974CUS/TR must be linearly derated above 140 °C ambient case temperature (TEC) to zero power at 175 °C, as specified in the Maximum Ratings section. Its 5 W rating applies only at TEC = 140 °C; at 160 °C, maximum allowable power drops to 2.5 W. This derating curve is essential for thermal design validation in high-temperature enclosures.
Is JANTX1N4974CUS/TR compatible with lead-free reflow processes?
No-JANTX1N4974CUS/TR features Sn/Pb finish on copper end caps and is not qualified for lead-free reflow. The datasheet specifies tin/lead termination, and Microsemi's legacy military diodes in the "US" series were not reformulated for Pb-free assembly. Use only with SnPb solder paste and corresponding thermal profiles to avoid intermetallic degradation.
What is the surge current rating for JANTX1N4974CUS/TR?
JANTX1N4974CUS/TR supports a nonrepetitive peak Zener surge current (IZSM) of 5.5 A for an 8.3 ms half-sine wave, per the Electrical Characteristics table. This value is derived from its 5 W power rating and thermal time constant, enabling robust transient suppression in power supply fault scenarios without permanent parameter shift.
How is polarity identified on JANTX1N4974CUS/TR?
JANTX1N4974CUS/TR uses a cathode band for polarity identification, consistent with JEDEC standard marking for Zener diodes. The band marks the cathode terminal, which must be connected to the higher-potential side of the circuit during reverse-bias regulation. No alphanumeric marking appears on the glass body per the Mechanical and Packaging section.
JANTX1N4974CUS/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
JANTX1N4974CUS/TR FAQ
1.How can I place an order for JANTX1N4974CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4974CUS/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 JANTX1N4974CUS/TR reliable?
The price and inventory of JANTX1N4974CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4974CUS/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 JANTX1N4974CUS/TR?
For technical support, including JANTX1N4974CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4974CUS/TR requirements.
6.How does Aetrix verify that JANTX1N4974CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4974CUS/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 JANTX1N4974CUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4974CUS/TR?
All JANTX1N4974CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4974CUS/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 JANTX1N4974CUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4974CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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