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Microchip Technology JANTX1N4965CUS/TR
- Part No.:
- JANTX1N4965CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4965CUS/TR.pdf
- Description:
- DIODE ZENER 20V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:4,321
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Product details
Overview
JANTX1N4965US/TR from Microsemi is a military-grade, hermetically sealed surface-mount Zener diode rated for 5 W power dissipation at 140 °C end-cap temperature, with a nominal Zener voltage of 20 V ±5%, dynamic impedance of 4.5 Ω at 65 mA test current, and operating junction temperature range of –65 °C to +175 °C. It serves as a precision voltage reference and regulation element in high-reliability power supply rails and analog signal conditioning circuits.
For engineers reviewing the JANTX1N4965US/TR datasheet, JANTX1N4965US/TR pinout, JANTX1N4965US/TR application, or JANTX1N4965US/TR equivalent, this part is selected for aerospace power sequencing, radiation-hardened sensor biasing, and MIL-PRF-19500/356-compliant voltage clamping where voidless-glass construction and Category I metallurgical bonding are mandatory.
Technical Context
This device operates in reverse breakdown mode with tightly controlled Zener voltage regulation across 10%–50% of maximum Zener current (IZM = 8.0 A), exhibiting ΔVZ ≤ 1.5 V under that load variation. Its thermal resistance is 7 °C/W junction-to-end-cap, enabling stable operation up to 175 °C junction temperature when mounted on thermally optimized PCB pads per D-5B footprint.
The JANTX1N4965US/TR uses triple-layer passivation and tungsten slugs within a voidless hard-glass case, with copper end caps finished in Sn/Pb. Polarity is marked by a cathode band, and it complies with MIL-STD-750 Method 1020 for ESD robustness and Microsemi MicroNote 050 for inherent radiation hardness.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V ±5% at IZT = 65 mA - defines regulated output voltage under nominal bias conditions |
| Power Dissipation (PZ) | 5 W @ TEC = 140 °C - sets maximum continuous thermal load before derating begins |
| Dynamic Impedance (ZZ) | 4.5 Ω @ IZT = 65 mA - determines voltage regulation stability under varying load current |
| Max Reverse Leakage (IR) | 2 μA @ VR = 15.2 V - ensures minimal parasitic current in standby or high-impedance bias networks |
| Surge Current (IZSM) | 8.0 A @ 8.3 ms square wave - supports transient overvoltage suppression without failure |
| Temp Coefficient (αVZ) | +0.085 %/°C @ IZT - quantifies voltage drift with temperature in precision reference designs |
| Forward Voltage (VF) | 1.50 V @ 1.0 A - defines conduction loss if used in forward-biased protection or clamp configurations |
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. Weight: 539 mg. Tape-and-reel compliant per EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-bias reference node | Connected to lower-potential rail; forms cathode-anode voltage drop defining Zener regulation point |
| Cathode | Regulated output node | Marked by band; supplies stable 20 V reference to load or feedback network when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal moisture and gas migration, ensuring long-term parameter stability in vacuum or high-humidity environments |
| Category I metallurgical bond | Guarantees mechanical integrity and thermal cycling reliability per MIL-PRF-19500/356 Class JANTX |
| Triple-layer passivation | Prevents surface leakage and contamination-induced parameter shift during extended field operation |
| Nonsensitive to ESD | Withstands >4 kV HBM per MIL-STD-750 Method 1020 without parameter degradation or catastrophic failure |
| Inherent radiation hardness | Validated per Microsemi MicroNote 050 for total ionizing dose (TID) tolerance in space and nuclear applications |
Applications
| Aerospace Power Sequencing | Radiation-Hardened Sensor Biasing |
|---|---|
Use Scenario: Controlling startup order of multiple voltage rails in satellite power management units. IC Role / Device Role / Timing Role: Zener reference for discrete comparator-based sequencing logic. Use Value: Stable 20 V threshold ensures deterministic turn-on timing across –65 °C to +175 °C and after 100 krad(Si) TID exposure. |
Use Scenario: Providing bias voltage to radiation-tolerant op-amps and ADC front-ends in nuclear instrumentation. IC Role / Device Role / Timing Role: Precision voltage reference for analog signal conditioning chain. Use Value: <0.085 %/°C tempco and <2 μA leakage maintain offset accuracy in low-power, high-impedance sensor interfaces. |
| MIL-STD-704 Transient Clamping | High-Temperature Engine Control |
Use Scenario: Suppressing 100 V/μs transients on 28 V aircraft power buses per MIL-STD-704 Appendix C. IC Role / Device Role / Timing Role: Fast-response shunt clamp activated during overvoltage events. Use Value: 8.0 A surge rating and 4.5 Ω ZZ enable clamping within 100 ns while limiting peak voltage to ≤22 V. |
Use Scenario: Regulating auxiliary 20 V rail for ignition control modules mounted near turbine housings. IC Role / Device Role / Timing Role: Primary voltage regulator in unregulated high-temp DC-DC stage. Use Value: 175 °C max junction rating and 7 °C/W thermal resistance allow direct mounting on aluminum heatsinks without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4965US | Higher screening level (JANTXV vs JANTX); tighter tempco (±0.075 %/°C vs ±0.085 %/°C); same VZ, PZ, package | Required for programs demanding extended burn-in, 100% lot testing, and enhanced radiation assurance | Select JANTXV1N4965US when full JANTXV qualification per MIL-PRF-19500/356 is mandated |
| 1N4965US | Commercial-grade version; no MIL-qualified screening; same electrical specs and D-5B package | Suitable only for non-military industrial prototypes or cost-sensitive ground-test hardware | Choose 1N4965US for development boards or non-flight subsystems where MIL-spec is not required |
Compared with JANTX1N4965US/TR, JANTXV1N4965US adds process controls for mission-critical reliability, while 1N4965US removes screening overhead but retains identical Zener behavior-enabling phased qualification paths from prototype to flight hardware.
Availability
JANTX1N4965US/TR is available at Aetrix Electronics and suitable for aerospace power sequencing, radiation-hardened sensor biasing, and MIL-STD-704 transient clamping requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTX1N4965US/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 JANTX1N4965US/TR belongs to Microsemi's military-qualified Zener diode family designed specifically for voltage regulation and reference applications in harsh-environment systems where hermetic sealing and radiation tolerance are non-negotiable.
FAQ
What is the Zener voltage tolerance for JANTX1N4965US/TR?
The JANTX1N4965US/TR has a nominal Zener voltage of 20 V with a standard tolerance of ±5%, as specified in the Microsemi SD44A datasheet. This tolerance applies at 25 °C and IZT = 65 mA. Tighter tolerances (e.g., ±2% or ±1%) require different suffixes (C or D) and are not applicable to the JANTX1N4965US/TR variant.
Does JANTX1N4965US/TR require derating above 140 °C?
Yes, JANTX1N4965US/TR must be derated linearly above an end-cap temperature (TEC) of 140 °C, reaching zero power dissipation at 175 °C. The derating slope is –35.7 mW/°C, calculated from 5 W over the 35 °C interval. Thermal design must account for this using the 7 °C/W junction-to-end-cap thermal resistance.
Is JANTX1N4965US/TR compatible with lead-free soldering processes?
No, JANTX1N4965US/TR features Sn/Pb-finished copper end caps and is not qualified for lead-free reflow profiles. Its maximum peak reflow temperature is limited to 235 °C per MIL-STD-202 Method 210, and lead-free processes exceeding 260 °C may compromise the hermetic seal or metallurgical bond integrity.
What is the maximum surge current rating for JANTX1N4965US/TR?
JANTX1N4965US/TR is rated for a non-repetitive peak Zener surge current (IZSM) of 8.0 A under an 8.3 ms square-wave pulse, as defined in the SD44A datasheet. This rating assumes proper PCB thermal mass and is validated per MIL-PRF-19500/356 transient stress requirements.
How is polarity identified on JANTX1N4965US/TR?
JANTX1N4965US/TR uses a visible cathode band on the glass body to indicate polarity. The banded end is the cathode; the opposite end is the anode. This marking is consistent across all 1N49xxUS-series devices and aligns with JEDEC-standard diode orientation conventions.
JANTX1N4965CUS/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
JANTX1N4965CUS/TR FAQ
1.How can I place an order for JANTX1N4965CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4965CUS/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 JANTX1N4965CUS/TR reliable?
The price and inventory of JANTX1N4965CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4965CUS/TR is usually 5 days.
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Once your JANTX1N4965CUS/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 JANTX1N4965CUS/TR?
For technical support, including JANTX1N4965CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4965CUS/TR requirements.
6.How does Aetrix verify that JANTX1N4965CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4965CUS/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 JANTX1N4965CUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4965CUS/TR?
All JANTX1N4965CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4965CUS/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 JANTX1N4965CUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4965CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
JANTX1N4965CUS/TR Tags
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