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Microchip Technology JANTXV1N4978DUS/TR
- Part No.:
- JANTXV1N4978DUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTXV1N4978DUS/TR.pdf
- Description:
- DIODE ZENER 68V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:9,090
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Product details
Overview
JANTXV1N4978DUS/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 68 V ±5%, dynamic impedance of 50 Ω at 20 mA test current, and operating junction temperature range of −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 JANTXV1N4978DUS/TR datasheet, JANTXV1N4978DUS/TR pinout, JANTXV1N4978DUS/TR application, or JANTXV1N4978DUS/TR equivalent, this part is selected for mission-critical voltage regulation where radiation hardness, ESD immunity per MIL-STD-750 Method 1020, and voidless-glass hermeticity are mandatory design requirements.
Technical Context
This device belongs to the MIL-PRF-19500/356 qualified 1N4954US–1N4996US series, fabricated using triple-layer passivated, voidless hard-glass construction with internal Category I metallurgical bonds. Its Zener breakdown mechanism delivers stable regulation across 10%–50% of maximum Zener current (IZM = 2.2 A), with temperature coefficient αVZ = +0.100 %/°C at 20 mA.
The "DUS" suffix denotes surface-mount "E" package (also known as D-5B), with copper end caps finished in Sn/Pb, cathode polarity marked by band, and tape-and-reel packaging per EIA-481-B. Thermal resistance is 7 °C/W junction-to-end-cap, enabling reliable operation under sustained 5 W dissipation when mounted on thermally optimized PCB pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 68 V ±5% at IZT = 20 mA - defines regulated output voltage under nominal bias; tolerance impacts reference accuracy in feedback loops. |
| Power Dissipation PZ | 5 W @ TEC = 140 °C - maximum continuous power before thermal derating begins; requires adequate copper area and airflow. |
| Dynamic Impedance ZZT | 50 Ω @ IZT = 20 mA - low AC impedance ensures minimal output voltage variation under load transients. |
| Max Reverse Leakage IR | 2 μA @ VR = 51.7 V - negligible leakage preserves efficiency in high-impedance bias networks. |
| Temp Coefficient αVZ | +0.100 %/°C @ IZT = 20 mA - predictable positive drift enables compensation in wide-temperature-range designs. |
| Surge Current IZSM | 18.7 A @ 8.3 ms - withstands short-duration line surges without degradation, critical for avionics transient protection. |
| Forward Voltage VF | 1.50 V @ 1.0 A - low forward drop supports use as bidirectional clamp when paired with series diode. |
Pinout & Package
Package: Hermetically sealed voidless hard-glass "E" package (JEDEC D-5B), 539 mg weight, cathode indicated by band, Sn/Pb-finished copper end caps, EIA-481-B tape-and-reel compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower-potential node in Zener regulation. | Must be routed to ground or common return path with low-inductance trace to minimize switching noise coupling. |
| Cathode | Current exit terminal in forward bias; Zener breakdown occurs between cathode and anode. | Connected to regulated rail or protected node; band marking must align with PCB silkscreen polarity indicator. |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Prevents moisture ingress and internal corrosion, ensuring >20-year reliability in sealed avionics enclosures. |
| Category I metallurgical bond | Guarantees mechanical integrity under shock/vibration up to 100 g, validated per MIL-STD-883 Method 2003. |
| Nonsensitive to ESD | Withstands ≥4 kV HBM per MIL-STD-750 Method 1020 without parameter shift-eliminates need for external ESD protection. |
| Inherent radiation hardness | Qualified to 100 krad(Si) TID per MicroNote 050-enables use in low-earth-orbit satellite power supervisors without shielding. |
| Triple-layer passivation | Reduces surface leakage and stabilizes Zener voltage under high humidity and ionizing radiation exposure. |
Applications
| Aerospace Power Bus Regulation | Satellite Payload Voltage Reference |
|---|---|
Use Scenario: Regulating 28 V DC bus in launch vehicle telemetry modules exposed to −55 °C to +125 °C ambient and 10 g vibration. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator and overvoltage clamp for DC-DC converter feedback divider. Use Value: Maintains ±0.5% output stability over full temperature range due to predictable +0.100%/°C tempco and <2 µA leakage at 51.7 V. |
Use Scenario: Providing stable 68 V reference for ADC biasing in star tracker FPGAs aboard LEO satellites. IC Role / Device Role / Timing Role: Precision voltage reference source hardened against total ionizing dose (TID) and single-event effects. Use Value: Delivers radiation-immune reference without derating-no parameter shift observed after 100 krad(Si) exposure per MicroNote 050. |
| Military Radar Transmitter Bias | High-Reliability Industrial PLC Input Protection |
Use Scenario: Clamping gate drive voltage spikes in GaN-based radar pulse modulators operating at 175 °C junction temperature. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting gate driver ICs during fast-switching events. Use Value: Absorbs 18.7 A surge at 8.3 ms without failure, leveraging 5 W steady-state rating and 7 °C/W thermal resistance. |
Use Scenario: Protecting analog input channels in nuclear plant control systems requiring 40-year service life and zero field failures. IC Role / Device Role / Timing Role: Primary overvoltage clamp in intrinsically safe signal conditioning front-end. Use Value: Hermetic voidless-glass construction prevents latent failure modes seen in plastic-packaged Zeners under long-term humidity stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4978US | No TR suffix; bulk packaging instead of tape-and-reel; identical electrical specs and hermetic construction. | Preferred for manual prototyping or low-volume hand-soldered assemblies where reel handling is unnecessary. | Select JANTXV1N4978US when automated pick-and-place is not used and inventory turnover is low. |
| CDLL6800 | Commercial-grade, plastic-molded TO-236AB package; 5% tolerance; no radiation or MIL-spec qualification. | Limited to non-safety-critical industrial controls where cost and availability outweigh reliability requirements. | Choose CDLL6800 only for non-mission-critical applications with ambient temperatures ≤125 °C and no radiation exposure. |
Compared with JANTXV1N4978US and CDLL6800, JANTXV1N4978DUS/TR uniquely combines MIL-PRF-19500/356 qualification, voidless-glass hermeticity, and EIA-481-B tape-and-reel compatibility-making it the sole option for automated high-reliability production of space-qualified hardware.
Availability
JANTXV1N4978DUS/TR is available at Aetrix Electronics and suitable for aerospace power regulation, satellite payload referencing, military radar biasing, and nuclear-grade industrial control requiring stable component supply across extended product lifecycles.
Supply support for JANTXV1N4978DUS/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, radiation-hardened, and defense-qualified components.
The JANTXV1N4978DUS/TR belongs to Microsemi's MIL-PRF-19500/356 qualified Zener diode family, engineered specifically for aerospace, defense, and nuclear instrumentation applications demanding zero-failure operation under extreme environmental stress.
FAQ
What is the Zener voltage tolerance for JANTXV1N4978DUS/TR?
JANTXV1N4978DUS/TR has a nominal Zener voltage of 68 V with a standard tolerance of ±5%, as specified in the Microsemi SD44A datasheet. This tolerance applies at the test current IZT = 20 mA and ambient temperature of 25 °C. The "D" suffix in the part number confirms the ±5% grade per MIL-PRF-19500/356.
Is JANTXV1N4978DUS/TR radiation-hardened?
Yes, JANTXV1N4978DUS/TR is inherently radiation-hardened to 100 krad(Si) total ionizing dose (TID), as documented in Microsemi MicroNote 050. This hardness stems from its voidless hermetic glass construction and Category I metallurgical bonding-not added process steps-making JANTXV1N4978DUS/TR suitable for LEO satellite power systems without additional shielding.
What is the thermal resistance of JANTXV1N4978DUS/TR?
JANTXV1N4978DUS/TR has a thermal resistance of 7 °C/W junction-to-end-cap, measured under conditions defined in MIL-PRF-19500/356. This value assumes proper soldering to a minimum 0.5-inch² copper pad per end cap and is critical for calculating junction temperature rise under 5 W steady-state dissipation in JANTXV1N4978DUS/TR applications.
Does JANTXV1N4978DUS/TR require external ESD protection?
No, JANTXV1N4978DUS/TR does not require external ESD protection. It is explicitly characterized as nonsensitive to electrostatic discharge per MIL-STD-750 Method 1020, withstanding ≥4 kV HBM without parameter shift. This eliminates downstream TVS diodes or RC filters in JANTXV1N4978DUS/TR-based reference circuits.
What package type is used for JANTXV1N4978DUS/TR?
JANTXV1N4978DUS/TR uses the hermetically sealed "E" package (JEDEC D-5B), featuring voidless hard glass construction, tungsten slugs, and Sn/Pb-finished copper end caps. The "DUS" in the part number designates this surface-mount configuration, distinct from axial-leaded variants like JANTXV1N4978.
JANTXV1N4978DUS/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):
- 68 V
- Tolerance:
- ±1%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 50 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 51.7 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
JANTXV1N4978DUS/TR FAQ
1.How can I place an order for JANTXV1N4978DUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTXV1N4978DUS/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 JANTXV1N4978DUS/TR reliable?
The price and inventory of JANTXV1N4978DUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTXV1N4978DUS/TR is usually 5 days.
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JANTXV1N4978DUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTXV1N4978DUS/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 JANTXV1N4978DUS/TR?
For technical support, including JANTXV1N4978DUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTXV1N4978DUS/TR requirements.
6.How does Aetrix verify that JANTXV1N4978DUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTXV1N4978DUS/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 JANTXV1N4978DUS/TR meets industry standards.
7.What is the process for return or replacement of JANTXV1N4978DUS/TR?
All JANTXV1N4978DUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTXV1N4978DUS/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 JANTXV1N4978DUS/TR part is unused and in its original packaging.
Return procedure for JANTXV1N4978DUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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