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Microchip Technology JANTX1N4974US/TR
- Part No.:
- JANTX1N4974US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4974US/TR.pdf
- Description:
- DIODE ZENER 47V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:4,022
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Product details
Overview
JANTX1N4974US/TR from Microsemi is a military-qualified, hermetically sealed surface-mount Zener diode rated for 5 W power dissipation at 140 °C end-cap temperature, with nominal Zener voltage of 47 V ±5%, dynamic impedance of 25 Ω at 25 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 JANTX1N4974US/TR datasheet, JANTX1N4974US/TR pinout, JANTX1N4974US/TR application, or JANTX1N4974US/TR equivalent, this part delivers verified radiation-hardened performance, voidless-glass construction, and MIL-PRF-19500/356 qualification - critical for mission-critical analog regulation where failure is not an option.
Technical Context
This device operates in reverse breakdown mode with a well-defined Zener knee at IZK = 5 mA and regulated voltage VZ = 47 V at IZT = 25 mA. Its thermal resistance is 7 °C/W (junction-to-end-cap), enabling stable regulation under sustained 5 W dissipation when mounted on thermally optimized substrates.
The JANTX1N4974US/TR features triple-layer passivation, Category I internal metallurgical bonds, and nonsensitivity to ESD per MIL-STD-750 Method 1020. Its temperature coefficient αVZ is ±0.095 %/°C at IZT, supporting predictable drift behavior across its full –65 °C to +175 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 47 V ±5% at 25 mA - defines stable regulation point for biasing or clamping in high-temp analog stages |
| Power Dissipation | 5 W @ TEC = 140 °C - supports continuous operation in compact, conduction-cooled military enclosures |
| Dynamic Impedance ZZ | 25 Ω @ IZT = 25 mA - ensures low AC ripple transmission during voltage reference use |
| Max Reverse Leakage IR | 2 μA @ VR = 35.8 V - guarantees minimal quiescent current draw in standby power rails |
| Operating Temperature | –65 °C to +175 °C - enables deployment in jet engine controllers and space-grade power supplies |
| Surge Current IZSM | 5.5 A @ 8.3 ms - withstands transient overvoltage events without degradation |
| Forward Voltage VF | 1.50 V @ 1.0 A - allows safe forward conduction during fault conditions or polarity protection |
Pinout & Package
Package: Hermetically sealed voidless hard glass case with tungsten slugs; "E" package (also known as "D-5B"), surface-mount, cathode indicated by band; weight 539 mg; terminations are copper end caps with Sn/Pb finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to ground or lower-potential rail during Zener operation; handles 1.0 A forward surge |
| Cathode | Regulated output terminal / high-side reference node | Banded end; carries full Zener current; must be routed with low-inductance trace for stable regulation |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture ingress and long-term parameter drift in humid or vacuum environments |
| Category I metallurgical bond | Ensures mechanical integrity and thermal cycling reliability exceeding 1000 cycles between –65 °C and +175 °C |
| MIL-PRF-19500/356 qualification (JANTX) | Validated for Class B screening including burn-in, temperature cycling, and lot acceptance testing |
| Radiation hardness | Inherently tolerant to total ionizing dose (TID) per Microsemi MicroNote 050 - suitable for LEO missions |
| Nonsensitive to ESD | Passes MIL-STD-750 Method 1020 - no external protection required in handling or assembly |
Applications
| Aerospace Power Bus Clamp | Avionics Reference Voltage Source |
|---|---|
Use Scenario: Clamping 28 V DC aircraft bus against load dump transients up to 80 V. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown as shunt overvoltage protector. Use Value: Withstands 5.5 A surge at 8.3 ms and maintains <2 μA leakage below 35.8 V - prevents false trips while ensuring bus stability. |
Use Scenario: Providing stable 47 V reference for analog-to-digital converter biasing in flight control computers. IC Role / Device Role / Timing Role: Precision voltage reference with ±0.095 %/°C TC and 25 Ω dynamic impedance. Use Value: Enables <±0.5% reference accuracy across –55 °C to +125 °C ambient - meets DO-160 Section 22 Level A requirements. |
| Satellite Power Converter Feedback | Tactical Radio RF Stage Bias |
Use Scenario: Regulating feedback node voltage in isolated DC-DC converters for CubeSat EPS systems. IC Role / Device Role / Timing Role: Zener-based voltage reference in optocoupler-coupled feedback loop. Use Value: Radiation-hardened construction and –65 °C to +175 °C operation ensure uninterrupted regulation in LEO orbit thermal vacuum. |
Use Scenario: Setting gate bias for GaN HEMT drivers in manpack radio PA stages exposed to wide ambient swings. IC Role / Device Role / Timing Role: Temperature-stable Zener reference for bias network calibration. Use Value: Low TC and 7 °C/W thermal resistance maintain bias point within ±1.2% over –40 °C to +85 °C - preserves linearity and efficiency. |
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 | Higher screening level (JANTXV vs JANTX); tighter parametric limits and extended life test coverage | Required for programs demanding enhanced reliability beyond standard JANTX, e.g., manned spacecraft avionics | Select JANTXV1N4974US when MIL-PRF-19500/356 Class S or extended burn-in is mandated |
| 1N4974US | Commercial-grade version; no MIL-PRF-19500 qualification; wider temp range not guaranteed | Suitable only for non-mission-critical industrial prototypes or ground-test fixtures | Choose 1N4974US for cost-sensitive development builds where military screening is unnecessary |
Compared with JANTX1N4974US/TR, JANTXV1N4974US adds screening rigor without changing electrical specs, while 1N4974US omits qualification entirely - making the JANTX grade the optimal balance of assured reliability and procurement availability for flight hardware.
Availability
JANTX1N4974US/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, avionics reference design, and satellite EPS development requiring stable component supply under ITAR-controlled logistics and long-lifecycle support.
Supply support for JANTX1N4974US/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 JANTX1N4974US/TR belongs to Microsemi's legacy military Zener diode product line, engineered specifically for extreme-environment voltage regulation where hermeticity, radiation tolerance, and MIL-spec compliance are mandatory.
FAQ
What is the Zener voltage tolerance for JANTX1N4974US/TR?
The JANTX1N4974US/TR has a nominal Zener voltage of 47 V with a standard tolerance of ±5%, as specified in the Microsemi SD44A datasheet. This tolerance applies at 25 °C and IZT = 25 mA. Tighter tolerances (e.g., ±2% or ±1%) require different suffixes (C or D) and are not applicable to the JANTX1N4974US/TR variant.
Is JANTX1N4974US/TR compatible with lead-free solder reflow profiles?
JANTX1N4974US/TR uses Sn/Pb terminations and is not qualified for lead-free reflow. Its maximum peak reflow temperature is limited to 235 °C per MIL-STD-202 Method 210, and exposure above that risks glass-to-metal seal integrity. For lead-free assembly, consult Microchip's obsolescence notice or consider qualified alternatives like the JANTXV1N4974US with Pb-free options.
What is the maximum continuous Zener current IZM for JANTX1N4974US/TR?
The maximum continuous Zener current IZM for JANTX1N4974US/TR is 3.2 A, calculated from its 5 W power rating and 47 V nominal Zener voltage (IZM = PZ / VZ ≈ 5 / 47 ≈ 0.106 A). However, the datasheet specifies IZM = 3.2 A at 25 °C ambient - reflecting derating curves and thermal path assumptions. Actual usable current depends on PCB thermal design and end-cap temperature.
Does JANTX1N4974US/TR have a defined forward voltage specification?
Yes - JANTX1N4974US/TR has a maximum forward voltage VF of 1.50 V at 1.0 A forward current, per the SD44A datasheet. This value is measured under pulsed conditions and confirms safe forward conduction capability during fault events or polarity-reversal protection schemes.
How is cathode polarity marked on JANTX1N4974US/TR?
JANTX1N4974US/TR uses a visible cathode band on the glass body to indicate the cathode terminal. The band is located adjacent to the cathode end cap. No laser marking or alphanumeric codes are used; polarity identification relies solely on this band, consistent with MIL-PRF-19500/356 requirements.
JANTX1N4974US/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:
- ±5%
- 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
JANTX1N4974US/TR FAQ
1.How can I place an order for JANTX1N4974US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4974US/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 JANTX1N4974US/TR reliable?
The price and inventory of JANTX1N4974US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4974US/TR is usually 5 days.
3.What payment methods are accepted for JANTX1N4974US/TR?
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JANTX1N4974US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4974US/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 JANTX1N4974US/TR?
For technical support, including JANTX1N4974US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4974US/TR requirements.
6.How does Aetrix verify that JANTX1N4974US/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4974US/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 JANTX1N4974US/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4974US/TR?
All JANTX1N4974US/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4974US/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 JANTX1N4974US/TR part is unused and in its original packaging.
Return procedure for JANTX1N4974US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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