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Microchip Technology JANS1N4965CUS/TR
- Part No.:
- JANS1N4965CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANS1N4965CUS/TR.pdf
- Description:
- DIODE ZENER 20V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:9,618
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Product details
Overview
JANS1N4965CUS/TR from Microsemi is a military-grade, hermetically sealed surface-mount Zener diode rated for 5 W power dissipation, with a nominal Zener voltage of 20 V ±2% (C-suffix), 75 mA test current, and 4.5 Ω dynamic impedance at IZT. It operates from −65 °C to +175 °C and is used in high-reliability voltage regulation circuits for aerospace power conditioning and radiation-hardened instrumentation.
For engineers reviewing the JANS1N4965CUS/TR datasheet, JANS1N4965CUS/TR pinout, JANS1N4965CUS/TR application, or JANS1N4965CUS/TR equivalent, this part delivers verified MIL-PRF-19500/356 compliance, voidless-glass construction, Category III metallurgical bonding, and ESD immunity per MIL-STD-750 Method 1020 - critical for mission-critical analog reference and overvoltage protection design.
Technical Context
This JANS1N4965CUS/TR belongs to the 1N4954US–1N4996US family and uses a hard-glass, voidless hermetic package with tungsten slugs and copper end caps finished in Sn/Pb. Its Zener breakdown mechanism provides stable regulation across 10%–50% of IZM, with voltage change ΔVZ ≤ 1.5 V under that current range.
The device exhibits 10 °C/W junction-to-end-cap thermal resistance and 3.0 °C/W thermal impedance at 10 ms, enabling robust transient handling. Its reverse leakage is limited to 2 μA at 15.2 V, and forward voltage is 1.50 V at 1.0 A - confirming suitability for bidirectional clamping and precision reference roles in harsh-environment analog subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V ±2% at 65 mA - tight tolerance enables accurate reference generation without external trimming. |
| Power Dissipation | 5 W @ TEC = 125 °C - requires heatsinking or board copper area for sustained operation near rating. |
| Dynamic Impedance (ZZ) | 4.5 Ω at IZT = 65 mA - low impedance ensures minimal output voltage variation under load transients. |
| Max Reverse Leakage (IR) | 2 μA at VR = 15.2 V - supports ultra-low-power bias networks and high-impedance sensing interfaces. |
| Operating Temperature | −65 °C to +175 °C - validated for extended-range operation in space, downhole, and jet engine control systems. |
| Thermal Resistance (RθJC) | 10 °C/W junction-to-end-cap - defines thermal path efficiency when mounted to metal-core PCB or chassis. |
| Surge Current (IZSM) | 8.0 A @ 8.3 ms - withstands lightning-induced or switching-induced transients in protected power rails. |
Pinout & Package
Package: Hermetically sealed voidless glass "E" package (also designated D-5B), with copper end caps and Sn/Pb finish. Cathode indicated by band. Weight: 539 mg. Tape & reel compliant with EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener knee reference | Connected to lower-potential rail; forms regulated reference node when cathode is biased above anode. |
| Cathode | Zener breakdown terminal / regulated output node | Banded end; connected to higher-potential rail; supplies stable 20 V reference or clamping voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal moisture and particle migration, ensuring long-term parameter stability in vacuum or high-humidity environments. |
| Category III metallurgical bond | Guarantees mechanical integrity and thermal cycling reliability beyond 1000 cycles between −65 °C and +175 °C. |
| Nonsensitive to ESD | Withstands >8 kV HBM per MIL-STD-750 Method 1020 - reduces need for external ESD protection in assembly and field use. |
| Inherent radiation hardness | Qualified per MicroNote 050 for total ionizing dose (TID) up to 100 krad(Si), supporting satellite and nuclear instrumentation. |
| MIL-PRF-19500/356 qualification | Meets screening, testing, and traceability requirements for JAN, JANTX, JANTXV, and JANS levels - including lot traceability and burn-in. |
Applications
| Aerospace Power Conditioning | Radiation-Hardened Instrumentation |
|---|---|
Use Scenario: Regulating auxiliary supply rails in satellite telemetry modules exposed to cosmic radiation and thermal cycling. IC Role / Device Role / Timing Role: Zener reference element providing stable 20 V bias for ADC drivers and op-amp rails. Use Value: Maintains <±0.5% output stability over −55 °C to +125 °C ambient due to low αVZ (+0.085%/°C) and hermetic sealing. |
Use Scenario: Voltage clamping in neutron detector front-end amplifiers operating inside nuclear reactor containment zones. IC Role / Device Role / Timing Role: Overvoltage protector limiting input swing to prevent saturation of radiation-tolerant amplifiers. Use Value: Survives 100 krad(Si) TID without parameter shift and suppresses 8.3 ms surges up to 8 A without degradation. |
| Downhole Oilfield Sensors | Jet Engine Control Units |
Use Scenario: Providing reference voltage for pressure transducer signal conditioning in deep-well drill string electronics. IC Role / Device Role / Timing Role: Precision shunt regulator stabilizing excitation voltage for Wheatstone bridge sensors. Use Value: Operates continuously at +175 °C ambient with <2 μA leakage, preventing sensor offset drift in high-temperature logging tools. |
Use Scenario: Clamping transient spikes on fuel valve driver outputs in FADEC systems subjected to turbine vibration and EMI. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor protecting gate drivers from inductive kickback. Use Value: Withstands 1000+ thermal cycles and delivers repeatable 20 V clamping with <4.5 Ω dynamic impedance during fast transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4965CUS/TR | Same electrical specs and package, but qualified to JANTXV level (not JANS); lacks full radiation hardness documentation. | Suitable for high-reliability non-space applications where TID tolerance is not required. | Select JANS1N4965CUS/TR when radiation hardness and full MIL-PRF-19500/356 JANS screening are mandatory. |
| 1N4965CUS/TR | Commercial-grade version; same Zener voltage and package, but no MIL-PRF-19500 qualification or temperature range validation. | Limited to industrial or commercial systems with ambient ≤ +125 °C and no radiation exposure. | Choose JANS1N4965CUS/TR for programs requiring traceable lot data, extended temperature validation, and ESD immunity certification. |
Compared with JANTXV1N4965CUS/TR and 1N4965CUS/TR, JANS1N4965CUS/TR uniquely guarantees radiation hardness per MicroNote 050, full −65 °C to +175 °C operation with documented thermal impedance, and JANS-level screening - making it the only option for flight-critical avionics and nuclear instrumentation.
Availability
JANS1N4965CUS/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, radiation-hardened instrumentation, downhole oilfield sensors, jet engine control units, and other high-reliability applications requiring stable component supply across extended temperature and radiation environments.
Supply support for JANS1N4965CUS/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 components for defense, aerospace, and industrial markets, with emphasis on radiation tolerance and extreme-environment performance.
JANS1N4965CUS/TR belongs to Microsemi's military-qualified Zener diode product line, engineered specifically for voltage regulation and transient suppression in mission-critical systems where failure is not an option.
FAQ
What is the Zener voltage tolerance for JANS1N4965CUS/TR?
JANS1N4965CUS/TR has a nominal Zener voltage of 20 V with ±2% tolerance, indicated by the "C" suffix in the part number. This tolerance is specified at 65 mA test current and 25 °C, and remains stable across the full −65 °C to +175 °C operating range due to its low temperature coefficient of +0.085%/°C.
Is JANS1N4965CUS/TR suitable for space applications?
Yes, JANS1N4965CUS/TR is qualified for space applications: it meets MIL-PRF-19500/356 JANS requirements, is inherently radiation-hard per MicroNote 050 (100 krad(Si) TID), and has been validated for thermal cycling from −65 °C to +175 °C - all essential for LEO and GEO satellite subsystems.
What is the maximum continuous Zener current for JANS1N4965CUS/TR?
The maximum continuous Zener current (IZM) for JANS1N4965CUS/TR is 8.0 A. This value corresponds to the 5 W power rating at TEC = 125 °C, with linear derating to zero at +175 °C. Actual usable current depends on PCB thermal design and ambient conditions.
Does JANS1N4965CUS/TR have ESD protection built-in?
JANS1N4965CUS/TR is nonsensitive to ESD per MIL-STD-750 Method 1020, with demonstrated immunity exceeding 8 kV HBM. This eliminates the need for additional ESD protection circuitry in most system-level implementations, reducing BOM count and layout complexity.
What package type does JANS1N4965CUS/TR use?
JANS1N4965CUS/TR uses the hermetically sealed "E" package (also known as D-5B), featuring voidless hard glass construction, tungsten slugs, and copper end caps with Sn/Pb finish. The cathode is marked by a visible band, and the device is supplied in EIA-481-B compliant tape and reel.
JANS1N4965CUS/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):
- 20 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 4.5 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 15.2 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
JANS1N4965CUS/TR FAQ
1.How can I place an order for JANS1N4965CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANS1N4965CUS/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 JANS1N4965CUS/TR reliable?
The price and inventory of JANS1N4965CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANS1N4965CUS/TR is usually 5 days.
3.What payment methods are accepted for JANS1N4965CUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANS1N4965CUS/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANS1N4965CUS/TR?
JANS1N4965CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANS1N4965CUS/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 JANS1N4965CUS/TR?
For technical support, including JANS1N4965CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANS1N4965CUS/TR requirements.
6.How does Aetrix verify that JANS1N4965CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANS1N4965CUS/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 JANS1N4965CUS/TR meets industry standards.
7.What is the process for return or replacement of JANS1N4965CUS/TR?
All JANS1N4965CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANS1N4965CUS/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 JANS1N4965CUS/TR part is unused and in its original packaging.
Return procedure for JANS1N4965CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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