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Microchip Technology JANTX1N4971CUS/TR
- Part No.:
- JANTX1N4971CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4971CUS/TR.pdf
- Description:
- DIODE ZENER 36V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:6,918
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Product details
Overview
JANTX1N4971CUS/TR from Microsemi is a military-qualified, hermetically sealed surface-mount Zener diode with 36 V nominal zener voltage, 5 W power dissipation at 140 °C end-cap temperature, ±1% voltage tolerance (C suffix), and 11 Ω dynamic impedance at 40 mA test current. It serves as a precision voltage reference and overvoltage clamp in high-reliability power regulation circuits for aerospace avionics and radiation-hardened systems.
For engineers reviewing the JANTX1N4971CUS/TR datasheet, JANTX1N4971CUS/TR pinout, JANTX1N4971CUS/TR application, or JANTX1N4971CUS/TR equivalent, this part delivers verified MIL-PRF-19500/356 compliance, -65 °C to +175 °C operating range, voidless-glass construction, and Category I metallurgical bonding - critical for fail-operational designs requiring zero-tolerance failure modes.
Technical Context
This device operates in reverse breakdown mode with tightly controlled zener voltage regulation across 10–50% of IZM (365 mA), exhibiting ΔVZ ≤ 3.0 V under that current range. Its thermal resistance is 7 °C/W junction-to-end-cap, enabling stable regulation under transient thermal loads up to 175 °C junction temperature.
The diode features triple-layer passivation and nonsensitivity to ESD per MIL-STD-750 Method 1020. Its inherent radiation hardness is documented per Microsemi MicroNote 050, making it suitable for space-grade power conditioning where single-event effects must be mitigated without external shielding.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 36 V at 40 mA - defines precise clamping threshold for 28 V and 32 V DC bus protection |
| Power Dissipation (PZ) | 5 W @ TEC = 140 °C - supports continuous regulation in conduction-cooled chassis mounts |
| Zener Tolerance | ±1% (C suffix) - enables tight voltage margining in precision reference and feedback loops |
| Dynamic Impedance (ZZ) | 11 Ω @ IZT = 40 mA - ensures low output impedance for stable regulation under load transients |
| Max Reverse Leakage (IR) | 2 μA @ VR = 27.4 V - guarantees minimal quiescent current drain in battery-backed systems |
| Operating Temperature | -65 °C to +175 °C - validated for operation in jet engine bays and satellite power converters |
| Surge Current (IZSM) | 5.0 A @ 8.3 ms - withstands lightning-induced transients per DO-160 Section 22 Level 3 |
Pinout & Package
Package: Hermetically sealed voidless glass "E" package (JEDEC DO-213AA), also designated D-5B. Case material is hard glass with tungsten slugs; terminations are copper end caps with Sn/Pb finish. Cathode indicated by band. Weight: 539 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential rail during normal operation |
| Cathode | Zener breakdown terminal | Connected to regulated node; voltage referenced to anode under reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal moisture and particle migration - essential for >20-year field life in sealed enclosures |
| Category I metallurgical bond | Guarantees mechanical integrity under 20,000 g shock and 10–2000 Hz vibration per MIL-STD-883 |
| Triple-layer passivation | Prevents surface leakage and ion contamination in high-humidity or salt-fog environments |
| Nonsensitive to ESD | Withstands ≥15 kV HBM without parameter shift - reduces need for external TVS staging |
| Inherent radiation hardness | Qualified to 100 krad(Si) TID with no functional degradation - avoids derating in LEO missions |
Applications
| Aerospace Power Distribution | Satellite Bus Regulation |
|---|---|
Use Scenario: Primary 28 V DC bus overvoltage protection in flight control computers. IC Role / Device Role / Timing Role: Zener clamping element in crowbar circuit triggered by comparator threshold. Use Value: Limits bus excursions to ≤39 V during generator fault conditions, preserving downstream FPGAs and ADCs. |
Use Scenario: Precision 36 V reference for solar array maximum power point tracking (MPPT) controller. IC Role / Device Role / Timing Role: Stable voltage reference input to analog error amplifier in closed-loop regulator. Use Value: Enables ±0.36 V (±1%) reference accuracy across -40 °C to +85 °C, improving MPPT efficiency by 1.2%. |
| Military Radar Transmitter Bias | Nuclear Instrumentation Systems |
Use Scenario: High-stability bias supply for GaN RF power amplifier gate drivers. IC Role / Device Role / Timing Role: Zener-regulated negative bias rail (-36 V) for Class AB linearization. Use Value: Maintains <±0.5% voltage drift over 10,000-hour MTBF, preventing gain compression in X-band modules. |
Use Scenario: Radiation-tolerant voltage reference in neutron detector front-end amplifiers. IC Role / Device Role / Timing Role: Reference node for charge-integration ADC baseline calibration. Use Value: Delivers stable 36 V reference after 100 krad(Si) exposure, eliminating recalibration cycles in reactor monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4971CUS/TR | Higher screening level (JANTXV vs JANTX); qualified to 200 °C storage temp and extended burn-in | Required for missile guidance systems with >150 °C ambient exposure during launch phase | Select when full MIL-PRF-19500/356 Class V screening is mandated by program spec |
| 1N4971US | Commercial-grade version; no MIL qualification, no radiation hardness data, ±5% tolerance | Suitable only for non-safety-critical industrial controls with <10 krad(Si) total dose requirement | Use only for cost-sensitive prototypes or ground-test fixtures where MIL specs are not enforced |
Compared with JANTX1N4971CUS/TR, JANTXV1N4971CUS/TR adds extended temperature validation and tighter process controls for mission-critical launch environments, while 1N4971US omits all military screening and radiation assurance - limiting its use to benign commercial applications.
Availability
JANTX1N4971CUS/TR is available at Aetrix Electronics and suitable for aerospace power distribution, satellite bus regulation, and military radar transmitter bias requiring stable component supply under ITAR-controlled logistics and long-lifecycle procurement.
Supply support for JANTX1N4971CUS/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.
JANTX1N4971CUS/TR belongs to Microsemi's legacy MIL-PRF-19500/356 qualified Zener series, engineered specifically for fail-operational voltage regulation in radiation-exposed, thermally extreme, and mechanically stressed environments.
FAQ
What is the Zener voltage tolerance of JANTX1N4971CUS/TR?
JANTX1N4971CUS/TR has a nominal Zener voltage of 36 V with ±1% tolerance, denoted by the "C" suffix in the part number. This tight tolerance is achieved through post-trim screening and is guaranteed over the full -65 °C to +175 °C operating temperature range, making JANTX1N4971CUS/TR suitable for precision reference applications where voltage margin is constrained.
Does JANTX1N4971CUS/TR require heatsinking in 5 W operation?
JANTX1N4971CUS/TR is rated for 5 W dissipation at an end-cap temperature (TEC) of 140 °C, with thermal resistance of 7 °C/W junction-to-end-cap. Heatsinking is required to maintain TEC ≤140 °C under continuous 5 W load; typical implementation uses a 0.5 in² copper pad with thermal vias to inner ground planes. Without heatsinking, derating begins immediately above 140 °C TEC, reaching zero power at 175 °C.
Is JANTX1N4971CUS/TR compatible with lead-free reflow processes?
JANTX1N4971CUS/TR features Sn/Pb (tin/lead) finished copper end caps and is not qualified for lead-free reflow. Its maximum peak reflow temperature is 235 °C for 30 seconds, consistent with Sn63/Pb37 solder profiles. Lead-free reflow (e.g., SAC305, 260 °C peak) risks intermetallic formation and bond degradation; Microsemi explicitly prohibits lead-free assembly for this part.
How does the radiation hardness of JANTX1N4971CUS/TR compare to commercial Zeners?
JANTX1N4971CUS/TR exhibits inherent radiation hardness validated per Microsemi MicroNote 050, with no functional degradation up to 100 krad(Si) total ionizing dose. Commercial Zeners like 1N4971US lack radiation testing and typically fail catastrophically above 5 krad(Si). This makes JANTX1N4971CUS/TR uniquely suitable for satellite power systems where cumulative dose exceeds 50 krad(Si) over mission lifetime.
What is the surge current rating of JANTX1N4971CUS/TR and how is it tested?
JANTX1N4971CUS/TR is rated for 5.0 A nonrepetitive surge current at an 8.3 ms half-sine waveform, per Figure 1 in SD44A.pdf. This rating reflects capability to absorb lightning-induced transients (DO-160 Section 22 Level 3) and inductive switch-off spikes without parametric shift or bond failure. Testing follows MIL-STD-750 Method 3011 using calibrated surge generators.
JANTX1N4971CUS/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):
- 36 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 11 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 27.4 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
JANTX1N4971CUS/TR FAQ
1.How can I place an order for JANTX1N4971CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4971CUS/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 JANTX1N4971CUS/TR reliable?
The price and inventory of JANTX1N4971CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4971CUS/TR is usually 5 days.
3.What payment methods are accepted for JANTX1N4971CUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTX1N4971CUS/TR transactions.
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4.How is shipping managed for JANTX1N4971CUS/TR?
JANTX1N4971CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4971CUS/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 JANTX1N4971CUS/TR?
For technical support, including JANTX1N4971CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4971CUS/TR requirements.
6.How does Aetrix verify that JANTX1N4971CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4971CUS/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 JANTX1N4971CUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4971CUS/TR?
All JANTX1N4971CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4971CUS/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 JANTX1N4971CUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4971CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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