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HomeProductsDiscrete Semiconductor ProductsDiodes - Zener - SingleJANTX1N4978CUS
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JANTX1N4978CUS - Microsemi Corporation

Manufacturer Part Number
JANTX1N4978CUS
Manufacturer
Microsemi
Allelco Part Number
98D-JANTX1N4978CUS
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
44,197 pcs available, New & Original
Parts Description
DIODE ZENER 68V 5W D5B
Package
D-5B
Data sheet
JANTX1N4978CUS.pdf
RoHs Status
 
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Our certification
In stock: 44197
  • Unit Price: $17.63
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $17.63 $17.63
200+ $6.82 $1,364.00
500+ $6.58 $3,290.00
1000+ $6.46 $6,460.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

JANTX1N4978CUS Tech Specifications
Microsemi Corporation - JANTX1N4978CUS technical specifications, attributes, parameters and parts with similar specifications to Microsemi Corporation - JANTX1N4978CUS

Product Attribute Attribute Value
Manufacturer Microsemi
Voltage - Zener (Nom) (Vz) 68 V
Voltage - Forward (Vf) (Max) @ If 1.5 V @ 1 A
Tolerance ±2%
Supplier Device Package D-5B
Series Military, MIL-PRF-19500/435
Power - Max 5 W
Product Attribute Attribute Value
Package / Case SQ-MELF, E
Package Bulk
Operating Temperature -65°C ~ 175°C
Mounting Type Surface Mount
Impedance (Max) (Zzt) 50 Ohms
Current - Reverse Leakage @ Vr 2 µA @ 51.7 V
Base Product Number 1N4978

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status RoHS non-compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99

Frequently Asked Questions(FAQ)

How does the JANTX1N4978CUS Zener diode’s 68 V nominal breakdown voltage and ±2% tolerance influence its use in precision voltage regulation under military-grade environmental conditions?
The JANTX1N4978CUS provides a tightly controlled Zener voltage of 68 V with a ±2% tolerance, enabling reliable reference behavior in high-stability circuits. This precision is critical when operating across the full -65°C to 175°C range typical of military applications, where thermal drift must be minimized. The combination of low leakage current (2 µA at 51.7 V) and stable impedance (50 Ω max) ensures consistent regulation even under transient load changes, making it suitable for aerospace and defense systems requiring predictable performance.
What are the implications of the JANTX1N4978CUS’s 5 W power rating and D-5B package when designing thermal management into a surface-mount circuit for high-reliability environments?
With a maximum power dissipation of 5 W, the JANTX1N4978CUS demands careful thermal planning in compact designs. Although the SQ-MELF/E package offers good heat conduction, sustained operation near full power requires attention to PCB copper area and airflow, especially given the military-grade operating temperature range up to 175°C. Engineers must ensure junction-to-ambient thermal resistance stays within bounds to prevent degradation—this often means derating or using thermal vias under the device in harsh environments.
How does the JANTX1N4978CUS compare to standard commercial-grade equivalents like the 1N4978 in terms of reliability and qualification, and why would a designer choose it over a non-JANTX version?
The JANTX1N4978CUS meets MIL-PRF-19500/435 qualification standards, which includes extended screening, radiation testing, and environmental stress validation absent in most commercial variants. While both share the same electrical characteristics—such as 68 V Zener voltage and 5 W power rating—the military grade ensures long-term stability and failure resistance under extreme conditions. Designers select the JANTX variant when sourcing through qualified supply chains for defense, space, or industrial systems where lifecycle predictability outweighs cost considerations.
Can the JANTX1N4978CUS be used interchangeably with other Zeners in the 1N4978 family if only surface mount and similar voltage are required?
Interchangeability depends on the specific application requirements. While the JANTX1N4978CUS shares core specs with commercial 1N4978 parts—including 68 V Zener voltage, 5 W power, and D-5B packaging—it carries stricter quality controls and broader temperature tolerance. In non-critical consumer electronics, substitution may work temporarily, but for mission-critical systems requiring traceable qualification data or extended operational life, the JANTX version offers superior reliability despite potential sourcing challenges due to its RoHS non-compliant status.
Why might a design engineer avoid using the JANTX1N4978CUS despite its strong military specifications?
Despite its robustness, several factors limit broad adoption: the RoHS non-compliant status restricts use in EU-regulated markets without exemptions; limited availability from distributors can complicate procurement timelines; and the need for MIL-SPEC sourcing adds administrative overhead. Additionally, newer alternatives with integrated protection features may offer better integration in modern power architectures, making the JANTX1N4978CUS a niche choice best reserved for legacy or certified system upgrades.
How does the reverse leakage current specification of the JANTX1N4978CUS affect its performance in ultra-low-power reference circuits?
At 2 µA reverse leakage measured at 51.7 V (below rated Zener voltage), this parameter is sufficiently low to minimize loading effects in precision references. However, in ultra-low-current applications where total bias current approaches microamp levels, even small leakage can skew measurement accuracy. Still, compared to many Zeners with higher leakage, the JANTX1N4978CUS maintains acceptable stability, particularly when paired with low-impedance loads and stable input sources, ensuring minimal impact on overall circuit efficiency.
What role does impedance (Zzt = 50 Ω max) play in dynamic load response for the JANTX1N4978CUS?
The dynamic impedance of 50 Ω limits how quickly the Zener can respond to rapid changes in load current while maintaining regulated voltage. In switching regulators or pulsed-load scenarios, higher Zzt values can cause output droop during transients. For the JANTX1N4978CUS, this moderate impedance strikes a balance between stability and responsiveness, making it adequate for linear post-regulators or clamping circuits where response speed is secondary to steady-state accuracy.
Is the JANTX1N4978CUS suitable for automotive applications despite being classified as military grade?
While not inherently designed for automotive AEC-Q101 qualification, the JANTX1N4978CUS’s wide operating temperature range (-65°C to 175°C) exceeds typical automotive thresholds (-40°C to +125°C). Its robust construction and high-voltage handling make it viable in specialized automotive subsystems like ignition control or ECU protection, provided the full qualification path isn’t required. However, standard automotive suppliers with AEC compliance should generally be preferred unless heritage or certification mandates justify its use.
How does the bulk packaging affect storage and handling protocols for the JANTX1N4978CUS?
Bulk packaging implies components are shipped loose in tubes or trays without individual moisture barrier bags, increasing risk of contamination. However, the Moisture Sensitivity Level (MSL) of 1 indicates unlimited floor life if stored properly—typically in dry ambient conditions. For high-volume production, this simplifies handling but demands strict adherence to ESD and cleanroom practices. Designers should verify internal packaging procedures align with MSL 1 guidelines to prevent latent defects in humid environments.
Can the JANTX1N4978CUS tolerate reverse polarity exposure longer than specified before damage occurs?
No—the datasheet specifies forward current limits and assumes normal operation. Prolonged reverse exposure beyond the breakdown region (even below 68 V) risks thermal runaway due to avalanche energy absorption. Though it will conduct heavily once above Vz, sustained reverse bias without current limiting can exceed 5 W power rating and lead to catastrophic failure. Always include series protection resistors in clamping circuits to manage transient energy safely.
Does the JANTX1N4978CUS require external filtering when used in high-noise industrial environments?
Given its 50 Ω dynamic impedance and 2 µA leakage, the JANTX1N4978CUS can function adequately in moderately noisy settings. However, in environments with fast transients or RF interference, additional input filtering (e.g., RC networks) is recommended to prevent false triggering or oscillations. The device itself lacks built-in noise immunity, so external suppression remains essential for reliable operation in switch-mode power supplies or motor-driven loads.
How does the absence of RoHS compliance impact global market deployment strategies involving the JANTX1N4978CUS?
RoHS non-compliance restricts use in Europe unless an exemption applies (e.g., national security or military applications). Manufacturers must maintain separate documentation and sourcing channels for such parts. This increases supply chain complexity and auditing requirements. As a result, designers considering international distribution should either seek RoHS-compliant alternatives or confirm that their end product qualifies under recognized exemptions before integrating the JANTX1N4978CUS.
What precautions should be taken when soldering the JANTX1N4978CUS due to its wide temperature operating range?
Although the part tolerates up to 175°C internally, solder reflow profiles must still adhere to industry standards (e.g., JEDEC J-STD-020) to avoid joint fatigue. Excessive peak temperatures or prolonged exposure can compromise bond integrity over time, especially under thermal cycling. Use SAC305 or lead-free compatible pastes cautiously, and validate solder joint reliability through accelerated life testing if deployed in vibration-prone or thermal-shock environments common in military hardware.
How does the JANTX1N4978CUS support redundancy in high-availability systems compared to lower-grade Zeners?
By meeting MIL-PRF-19500/435, the JANTX1N4978CUS undergoes rigorous parametric and environmental testing, reducing early-life failure rates. When used in parallel configurations or dual-path regulation, this enhanced reliability minimizes correlated failures. Combined with its stable Vz and low leakage, it provides a dependable reference point across decades of operation—critical in satellite telemetry, radar systems, or secure communications where component replacement is impractical post-deployment.

Parts with Similar Specifications

The three parts on the right have similar specifications to Microsemi Corporation JANTX1N4978CUS

Product Attribute JANTX1N4978CUS/TR JANTX1N4977CUS/TR JANTX1N4978DUS JANTX1N4978US
Part Number JANTX1N4978CUS/TR JANTX1N4977CUS/TR JANTX1N4978DUS JANTX1N4978US
Manufacturer Microchip Technology Microchip Technology Microsemi Corporation Microchip Technology
Voltage - Zener (Nom) (Vz) - - - -
Voltage - Forward (Vf) (Max) @ If - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Series - - - -
Power - Max - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Impedance (Max) (Zzt) - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Tolerance - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Current - Reverse Leakage @ Vr - - - -

JANTX1N4978CUS Datasheet PDF

Download JANTX1N4978CUS pdf datasheets and Microsemi Corporation documentation for JANTX1N4978CUS - Microsemi Corporation.

Environmental Information
Microchip CA Prop65.pdf Microchip REACH.pdf Microchip RoHS.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Arch***ct
    Jul 15, 2026

    Used this device in a communication signal processing board. Stable timing and no unexpected issues during implementation.

  • FPGA***lorer88
    Jul 7, 2026

    The FPGA works properly and all functions operate as expected. Documentation required some additional research, but overall it is a usable device for smaller signal processing projects.

  • Nath***oleman
    Jun 29, 2026

    Used this sensor component in an industrial automation setup. Detection accuracy was consistent and installation was straightforward.

  • Emil***rperTech
    Jun 23, 2026

    Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.

  • Liam***terTech
    Jun 15, 2026

    Used this CPLD in a logic control project. Programming was straightforward and signal timing matched the design requirements.

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

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Shipment

Delivery Time

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Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
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Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
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Electrostatic Discharge Protection and Handling

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Microsemi Corporation

JANTX1N4978CUS

Microsemi Corporation
98D-JANTX1N4978CUS

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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