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Microchip Technology JANS1N4971CUS/TR
- Part No.:
- JANS1N4971CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANS1N4971CUS/TR.pdf
- Description:
- DIODE ZENER 36V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:6,952
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Product details
Overview
JANS1N4971CUS/TR from Microsemi is a hermetically sealed, voidless-glass surface-mount 5 W Zener diode with nominal Zener voltage of 36 V, ±1% tolerance (C suffix), and maximum dynamic impedance of 220 Ω at 11 mA test current. It operates from −65 °C to +175 °C and is qualified to MIL-PRF-19500/356 for high-reliability voltage regulation in radiation-hardened aerospace power conditioning circuits.
For engineers reviewing the JANS1N4971CUS/TR datasheet, JANS1N4971CUS/TR pinout, JANS1N4971CUS/TR application, or JANS1N4971CUS/TR equivalent, key selection criteria include its Category III metallurgical bond, 2.0 V maximum reverse leakage at 27.4 V, 6.5 A maximum continuous Zener current, and compatibility with EIA-481-B tape-and-reel packaging for automated SMT assembly.
Technical Context
This device belongs to the JANS-qualified 1N4954US–1N4996US series, featuring triple-layer passivation and internal tungsten slugs bonded via Category III metallurgical construction for enhanced thermal and mechanical robustness. Its voidless-glass hermetic seal ensures zero moisture ingress and immunity to MIL-STD-750 Method 1020 ESD stress.
Designed for stable regulation across wide temperature and current ranges, JANS1N4971CUS/TR delivers ≤±0.095 %/°C temperature coefficient and maintains ≤3.0 V voltage regulation (ΔVZ) between 10% and 50% of IZM. It supports surge currents up to 5.0 A (8.3 ms square wave) without degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 36 V at 11 mA test current - precise reference for 28 V and 32 V bus regulation stages |
| Zener Tolerance | ±1% (C suffix) - enables tight-loop feedback in precision voltage monitors |
| Power Dissipation | 5 W @ TEC = 125 °C - requires minimal heatsinking in compact military PCB layouts |
| Dynamic Impedance (ZZ) | 220 Ω @ IZT = 11 mA - ensures low AC ripple coupling into regulated outputs |
| Max Reverse Leakage (IR) | 2 μA @ VR = 27.4 V - guarantees negligible standby current in battery-backed systems |
| Thermal Resistance (RθJC) | 10 °C/W junction-to-end-cap - enables direct thermal path to copper pour or chassis mount |
| Operating Temperature | −65 °C to +175 °C - validated for missile guidance electronics and satellite power subsystems |
Pinout & Package
Package: Hermetically sealed voidless glass "E" package (also designated D-5B), with copper end caps finished in Sn/Pb, cathode indicated by band, weight 539 mg. Tape-and-reel compliant per EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential rail during Zener operation |
| Cathode | Zener breakdown terminal | Connected to unregulated input; band-marked end cap provides visual polarity identification |
Key Features
| Feature | Design Value |
|---|---|
| Category III metallurgical bond | Enables survivability under mechanical shock ≥1000 g and thermal cycling from −65 °C to +175 °C |
| Voidless hermetic glass seal | Eliminates internal delamination risk and prevents parametric drift over 20+ year mission life |
| Triple-layer passivation | Blocks ion migration and surface contamination in high-humidity or atomic oxygen environments |
| Radiation hardness | Inherently tolerant to total ionizing dose (TID) ≥100 krad(Si), per MicroNote 050 |
| Nonsensitive to ESD | Withstands ≥4 kV HBM per MIL-STD-750 Method 1020 without parameter shift |
Applications
| Avionics Power Conditioning | Satellite Bus Regulation |
|---|---|
|
Use Scenario: Regulating 28 V DC bus in flight control computers where transient suppression and long-term stability are critical. IC Role / Device Role / Timing Role: Primary shunt voltage reference and overvoltage clamp in dual-redundant DC-DC converter feedback loops. Use Value: ±1% tolerance and <0.1 %/°C TC ensure output accuracy remains within ±1.5% over full mission temperature range. |
Use Scenario: Providing stable bias for radiation-tolerant op-amps and ADC references in LEO satellite telemetry modules. IC Role / Device Role / Timing Role: Precision Zener reference replacing less robust silicon alternatives in analog signal chains. Use Value: Voidless-glass construction prevents parameter drift after 10 krad(Si) exposure, maintaining reference integrity. |
| Missile Guidance Sensors | Nuclear Instrumentation |
|
Use Scenario: Stabilizing excitation voltage for piezoresistive accelerometers subjected to high-g launch vibration. IC Role / Device Role / Timing Role: Low-noise, high-stability shunt regulator supplying sensor bridge bias. Use Value: 220 Ω dynamic impedance minimizes noise coupling into microvolt-level sensor outputs. |
Use Scenario: Acting as overvoltage protection and reference element in neutron detector pulse-shaping circuits. IC Role / Device Role / Timing Role: Fail-safe voltage clamp and calibration reference in safety-critical reactor monitoring hardware. Use Value: MIL-PRF-19500/356 qualification and −65 °C to +175 °C rating support deployment in containment vessel electronics. |
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 | Same electrical specs but rated to JANTXV level (−65 °C to +175 °C, 100% screening); no radiation hardness documentation provided | Lacks documented radiation tolerance; suitable for non-space high-reliability ground systems only | Select when radiation hardness is not required but extended burn-in and lot traceability are needed |
| 1N4971CUS/TR | Commercial-grade version; same Zener voltage/tolerance but not MIL-qualified; no Category III bond or triple passivation | Not approved for defense/aerospace use; limited to industrial or test equipment where qualification is waived | Choose only for cost-sensitive prototyping or non-mission-critical subsystems with relaxed reliability requirements |
Compared with JANS1N4971CUS/TR, JANTXV1N4971CUS/TR offers identical performance with reduced radiation assurance, while 1N4971CUS/TR omits military screening, metallurgical bonding, and hermetic validation-making it unsuitable for flight hardware where failure is unacceptable.
Availability
JANS1N4971CUS/TR is available at Aetrix Electronics and suitable for avionics power conditioning, satellite bus regulation, missile guidance sensors, and nuclear instrumentation requiring stable component supply under extended temperature and radiation constraints.
Supply support for JANS1N4971CUS/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 semiconductor components for aerospace, defense, and industrial markets, with deep expertise in radiation-hardened and hermetically sealed devices.
JANS1N4971CUS/TR belongs to Microsemi's MIL-PRF-19500/356-qualified Zener diode family, engineered specifically for voltage regulation in mission-critical systems where parametric stability under extreme environmental stress is mandatory.
FAQ
What is the Zener voltage tolerance of JANS1N4971CUS/TR?
JANS1N4971CUS/TR has a nominal Zener voltage of 36 V with ±1% tolerance, indicated by the "C" suffix in the part number. This tight tolerance is achieved through post-trim testing and is guaranteed over the full operating temperature range of −65 °C to +175 °C, making JANS1N4971CUS/TR suitable for precision reference applications in flight-critical hardware.
Is JANS1N4971CUS/TR compatible with lead-free reflow processes?
JANS1N4971CUS/TR uses Sn/Pb-finished copper end caps and is not qualified for lead-free reflow. Its maximum soldering temperature is limited to 260 °C for 10 seconds per J-STD-020, and the Sn/Pb finish requires compatible Pb-containing solder paste. For lead-free assembly, JANS1N4971CUS/TR must be hand-soldered or processed using controlled Pb-based reflow profiles.
Does JANS1N4971CUS/TR require derating above 125 °C?
Yes - JANS1N4971CUS/TR is rated for 5 W dissipation only at TEC = 125 °C. Above this temperature, power must be linearly derated to zero at +175 °C, yielding a derating slope of 66.7 mW/°C. At 150 °C, maximum allowable power drops to 3.33 W, which directly impacts sustained current capability in high-temperature enclosures.
What is the meaning of "Category III metallurgical bond" in JANS1N4971CUS/TR?
Category III refers to Microsemi's highest-grade internal metallurgical bond between the silicon die and tungsten slug, qualified per MIL-PRF-19500/356 for extreme thermal cycling and mechanical shock. In JANS1N4971CUS/TR, this bond ensures no interfacial delamination occurs after 1000 cycles between −65 °C and +175 °C, preserving long-term Zener voltage stability.
Can JANS1N4971CUS/TR be used as a replacement for JANS1N4970CUS/TR?
No - JANS1N4971CUS/TR (36 V) and JANS1N4970CUS/TR (33 V) have different nominal Zener voltages and non-interchangeable test currents (11 mA vs. 10 mA). Their dynamic impedances (220 Ω vs. 200 Ω) and temperature coefficients (+0.095 %/°C vs. +0.095 %/°C) differ slightly. Substitution would alter regulation setpoint and loop gain; JANS1N4971CUS/TR must be selected only where 36 V is explicitly required.
JANS1N4971CUS/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
JANS1N4971CUS/TR FAQ
1.How can I place an order for JANS1N4971CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANS1N4971CUS/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 JANS1N4971CUS/TR reliable?
The price and inventory of JANS1N4971CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANS1N4971CUS/TR is usually 5 days.
3.What payment methods are accepted for JANS1N4971CUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANS1N4971CUS/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANS1N4971CUS/TR?
JANS1N4971CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANS1N4971CUS/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 JANS1N4971CUS/TR?
For technical support, including JANS1N4971CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANS1N4971CUS/TR requirements.
6.How does Aetrix verify that JANS1N4971CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANS1N4971CUS/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 JANS1N4971CUS/TR meets industry standards.
7.What is the process for return or replacement of JANS1N4971CUS/TR?
All JANS1N4971CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANS1N4971CUS/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 JANS1N4971CUS/TR part is unused and in its original packaging.
Return procedure for JANS1N4971CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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