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Microchip Technology JANTXV1N4978CUS/TR
- Part No.:
- JANTXV1N4978CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTXV1N4978CUS/TR.pdf
- Description:
- DIODE ZENER 68V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:9,049
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Product details
Overview
JANTXV1N4978CUS/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 68 V at 20 mA test current, ±2% tolerance (C suffix), and operating junction temperature range of –65 °C to +175 °C. It serves as a precision voltage reference and overvoltage clamp in high-reliability power regulation circuits for aerospace and defense systems.
For engineers reviewing the JANTXV1N4978CUS/TR datasheet, JANTXV1N4978CUS/TR pinout, JANTXV1N4978CUS/TR application, or JANTXV1N4978CUS/TR equivalent, this part delivers verified radiation-hardened performance, voidless-glass construction, Category III metallurgical bonding, and MIL-PRF-19500/356 qualification - critical for mission-critical analog voltage stabilization under extreme thermal and radiation stress.
Technical Context
This device operates in reverse breakdown mode with tightly controlled dynamic impedance (50 Ω at 20 mA) and low voltage regulation drift (ΔVZ ≤ 0.55 V between 10% and 50% of IZM). Its thermal resistance is 10 °C/W junction-to-end-cap, enabling stable regulation up to 175 °C junction temperature when mounted on thermally optimized PCBs.
The JANTXV1N4978CUS/TR exhibits negligible ESD sensitivity per MIL-STD-750 Method 1020 and inherent total ionizing dose (TID) hardness per MicroNote 050. Its cathode band polarity marking and Sn/Pb-finished copper end caps ensure reliable solder joint integrity and unambiguous orientation during automated SMT assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V ±2% at IZT = 20 mA - enables precise 68 V rail clamping or reference generation with minimal calibration overhead. |
| Power Dissipation | 5 W @ TEC = 125 °C - supports continuous operation in high-temperature avionics enclosures without forced cooling. |
| Dynamic Impedance (ZZT) | 50 Ω at IZT = 20 mA - ensures minimal output voltage variation under load transients in regulated supply feedback paths. |
| Max Reverse Leakage (IR) | 2 μA at VR = 51.7 V - guarantees low standby current in battery-backed protection circuits. |
| Temp Coefficient (αVZ) | +0.100 %/°C - predictable positive drift allows accurate compensation in wide-temperature-range instrumentation. |
| Surge Current (IZSM) | 2.2 A @ 8.3 ms - withstands lightning-induced transients in MIL-STD-461-compliant power entry stages. |
| Operating Temperature | –65 °C to +175 °C - qualified for use in satellite power subsystems and jet engine control electronics. |
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 / low-side connection | Connected to circuit ground or lower-potential node; must be routed with low-inductance path for surge handling. |
| Cathode | Zener breakdown terminal / regulated output node | Marked by band; connects to voltage rail being stabilized; requires thermal pad attachment for 5 W dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Prevents moisture ingress and internal corrosion over 20+ year field life in humid or vacuum environments. |
| Category III metallurgical bond | Ensures mechanical robustness against thermal cycling shock (–65 °C to +175 °C, 1000 cycles) without bond lift. |
| Triple-layer passivation | Blocks surface leakage paths and suppresses parameter shift under high-humidity bias stress testing. |
| Nonsensitive to ESD (MIL-STD-750) | Eliminates need for on-board ESD protection networks in sensitive analog front-ends. |
| Inherent radiation hardness | Validated TID tolerance > 100 krad(Si) per MicroNote 050 - suitable for LEO satellite power conditioning. |
Applications
| Aerospace Power Regulation | Defense System Voltage Clamping |
|---|---|
Use Scenario: Stabilizing 68 V bus in satellite solar array regulators subject to thermal cycling and radiation exposure. IC Role / Device Role / Timing Role: Precision Zener reference and overvoltage clamp in DC-DC converter feedback loop. Use Value: Maintains ±2% regulation across –65 °C to +175 °C with no derating below 125 °C, reducing need for active compensation. |
Use Scenario: Protecting radar receiver front-end analog stages from EMP-induced voltage surges. IC Role / Device Role / Timing Role: Fast-acting transient voltage suppressor with 2.2 A 8.3 ms surge rating. Use Value: Absorbs MIL-STD-464-compliant surges without degradation, leveraging hermetic seal for long-term reliability. |
| Downhole Oilfield Instrumentation | Nuclear Facility Sensor Biasing |
Use Scenario: Providing stable 68 V bias for piezoelectric pressure transducers in geothermal drill strings. IC Role / Device Role / Timing Role: High-temperature voltage reference in sensor signal conditioning ASICs. Use Value: Operates continuously at 175 °C ambient with <100 ppm/°C drift, eliminating external temperature compensation. |
Use Scenario: Supplying calibrated bias voltage to radiation-detection scintillation photomultipliers. IC Role / Device Role / Timing Role: Low-leakage (2 μA), radiation-hardened reference source. Use Value: Delivers stable 68 V with <0.1% TID-induced parameter shift, ensuring consistent detector gain calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4978US/TR | Same 68 V rating but ±5% tolerance (no C suffix); higher ZZT = 60 Ω; identical package and temp range. | Acceptable where tighter voltage accuracy is not required; lower cost for non-critical biasing. | Select JANTXV1N4978US/TR only if system-level calibration can accommodate ±5% VZ variation. |
| CDLL6800 | Commercial-grade 68 V Zener; 1.5 W rating; plastic SOD-123 package; max TJ = +150 °C; no radiation hardening. | Limited to benign-environment industrial controls; unsuitable for aerospace or nuclear applications. | Use CDLL6800 only in cost-sensitive, non-military designs where 5 W power and radiation tolerance are unnecessary. |
Compared with JANTXV1N4978US/TR and CDLL6800, the JANTXV1N4978CUS/TR uniquely combines ±2% tolerance, 5 W dissipation, hermetic sealing, and radiation hardness - making it irreplaceable in flight-critical voltage references where parameter stability under extreme stress is mandatory.
Availability
JANTXV1N4978CUS/TR is available at Aetrix Electronics and suitable for aerospace power regulation, defense system voltage clamping, and downhole oilfield instrumentation requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTXV1N4978CUS/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 aerospace, defense, and industrial markets.
The JANTXV1N4978CUS/TR belongs to Microsemi's military-qualified Zener regulator family designed specifically for voltage reference and transient suppression in mission-critical systems exposed to extreme thermal, mechanical, and radiation stress.
FAQ
What is the Zener voltage tolerance of JANTXV1N4978CUS/TR?
The JANTXV1N4978CUS/TR has a nominal Zener voltage of 68 V with a tolerance of ±2%, indicated 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. The JANTXV1N4978CUS/TR maintains this specification without requiring external calibration in high-reliability applications.
Does JANTXV1N4978CUS/TR require heatsinking for 5 W operation?
Yes - the JANTXV1N4978CUS/TR dissipates 5 W at TEC = 125 °C, with a thermal resistance of 10 °C/W junction-to-end-cap. To sustain full power at elevated ambient temperatures, the end caps must be soldered to thermally conductive PCB copper areas or attached to a heatsink. Without thermal management, the JANTXV1N4978CUS/TR will exceed its 175 °C maximum junction temperature under continuous 5 W load.
Is JANTXV1N4978CUS/TR compatible with lead-free reflow processes?
No - the JANTXV1N4978CUS/TR features Sn/Pb-finished copper end caps and is qualified for eutectic tin-lead soldering per MIL-STD-202. Its glass package and internal metallurgy are not rated for peak reflow temperatures ≥260 °C required by lead-free processes. Using lead-free reflow may crack the hermetic seal or degrade the Category III bond, compromising the JANTXV1N4978CUS/TR reliability in harsh environments.
How does JANTXV1N4978CUS/TR perform under radiation exposure?
The JANTXV1N4978CUS/TR exhibits inherent total ionizing dose (TID) hardness exceeding 100 krad(Si), as documented in Microsemi MicroNote 050. Its voidless-glass construction and Category III metallurgical bond prevent radiation-induced parameter shift or catastrophic failure. This makes the JANTXV1N4978CUS/TR suitable for satellite power systems and nuclear instrumentation where long-term parametric stability under radiation is essential.
What is the surge current rating of JANTXV1N4978CUS/TR?
The JANTXV1N4978CUS/TR is rated for a non-repetitive peak Zener surge current (IZSM) of 2.2 A for an 8.3 ms half-sine waveform, per MIL-STD-750 Method 3013. This rating enables the JANTXV1N4978CUS/TR to absorb transient energy from lightning strikes or switching surges in MIL-STD-461-compliant power inputs without degradation, provided the surge duty cycle remains within specified limits.
JANTXV1N4978CUS/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:
- ±2%
- 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
JANTXV1N4978CUS/TR FAQ
1.How can I place an order for JANTXV1N4978CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTXV1N4978CUS/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 JANTXV1N4978CUS/TR reliable?
The price and inventory of JANTXV1N4978CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTXV1N4978CUS/TR is usually 5 days.
3.What payment methods are accepted for JANTXV1N4978CUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTXV1N4978CUS/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANTXV1N4978CUS/TR?
JANTXV1N4978CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTXV1N4978CUS/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 JANTXV1N4978CUS/TR?
For technical support, including JANTXV1N4978CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTXV1N4978CUS/TR requirements.
6.How does Aetrix verify that JANTXV1N4978CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTXV1N4978CUS/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 JANTXV1N4978CUS/TR meets industry standards.
7.What is the process for return or replacement of JANTXV1N4978CUS/TR?
All JANTXV1N4978CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTXV1N4978CUS/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 JANTXV1N4978CUS/TR part is unused and in its original packaging.
Return procedure for JANTXV1N4978CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
JANTXV1N4978CUS/TR Tags
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