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Home Products Discrete Semiconductor Products Diodes - Zener - Single~~JANTX1N4977CUS/TR~~

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JANTX1N4977CUS/TR - Microchip Technology

Name: Microchip Technology JANTX1N4977CUS/TR
Brand: Microchip Technology
SKU: JANTX1N4977CUS/TR
Price: 24.75 USD
Availability: InStock
Rating: 5 (6 reviews)

Manufacturer Part Number: JANTX1N4977CUS/TR

Manufacturer: Microchip Technology

Allelco Part Number: 98D-JANTX1N4977CUS/TR

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 35,759 pcs available, New & Original

Parts Description: VOLTAGE REGULATOR

Package: E-MELF

Data sheet: -

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Specifications

JANTX1N4977CUS/TR Tech Specifications
Microchip Technology - JANTX1N4977CUS/TR technical specifications, attributes, parameters and parts with similar specifications to Microchip Technology - JANTX1N4977CUS/TR

Product Attribute	Attribute Value
Manufacturer	Microchip Technology
Voltage - Zener (Nom) (Vz)	62 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 1 A
Tolerance	±2%
Supplier Device Package	E-MELF
Series	MIL-PRF-19500/356
Power - Max	5 W

Product Attribute	Attribute Value
Package / Case	SQ-MELF, E
Package	Tape & Reel (TR)
Operating Temperature	-65°C ~ 175°C (TJ)
Mounting Type	Surface Mount
Impedance (Max) (Zzt)	42 Ohms
Current - Reverse Leakage @ Vr	2 µA @ 47.1 V

Environmental & Export Classifications

ATTRIBUTE	DESCRIPTION
ECCN	EAR99

Frequently Asked Questions(FAQ)

How does the JANTX1N4977CUS/TR perform in high-temperature environments compared to standard commercial-grade zener diodes, and what design implications does this have for military or aerospace applications?: The JANTX1N4977CUS/TR is qualified under MIL-PRF-19500/356 with a maximum junction temperature of 175°C, making it suitable for extreme thermal conditions where commercial-grade devices might fail. Unlike typical consumer-grade zeners rated for 150°C or less, this component maintains stable Zener voltage (62 V ±2%) even at elevated temperatures due to its robust semiconductor process. In power supply reference circuits within avionics systems, this reliability prevents drift in critical regulation points, reducing the need for redundant thermal management or derating. Designers can confidently use the JANTX1N4977CUS/TR in sealed enclosures or behind heat-generating components without sacrificing performance, which is essential in space-constrained military platforms.

What are the key trade-offs between using the JANTX1N4977CUS/TR versus lower-wattage zener diodes when designing a precision voltage reference for a 28V DC bus in an industrial control system?: While lower-power zeners like 1N4733A (5.1V, 1W) offer smaller size and lower leakage, they lack sufficient power handling and stability for high-current reference loads. The JANTX1N4977CUS/TR’s 5W rating allows it to drive moderate load currents without significant voltage droop, maintaining tight regulation under dynamic loads. However, its higher impedance (42 Ω max Zzt) means it may require a buffer amplifier in ultra-low-noise applications, whereas a lower-Zzt part could regulate directly. For a 28V system requiring a stable 62V reference across a 100mA load, the JANTX1N4977CUS/TR avoids excessive power dissipation in series resistors—critical for efficiency and thermal design—making it preferable despite its larger E-MELF footprint.

Why would an engineer choose surface-mount packaging over through-hole for integrating the JANTX1N4977CUS/TR into a high-density PCB layout?: The E-MELF package enables automated assembly via pick-and-place machines, reducing manufacturing cost and increasing throughput in volume production. Surface mounting also minimizes parasitic inductance and improves thermal coupling to the ground plane, enhancing transient response in switching regulator feedback loops. Though through-hole variants exist for legacy systems, the JANTX1N4977CUS/TR’s SQ-MELF form factor supports finer pitch layouts and saves board real estate—important in compact radar or communication modules where space is constrained. Additionally, the tape-and-reel packaging facilitates reliable high-speed reel-to-reel processing in automated lines.

How does the ±2% tolerance and 42 Ω dynamic impedance of the JANTX1N4977CUS/TR influence its suitability for analog signal conditioning versus digital logic clamping?: The tight ±2% Zener voltage tolerance ensures predictable breakdown behavior across temperature and aging, which is vital in analog front-end circuits such as sensor excitation or bias networks. In contrast, digital clamping often tolerates wider variations since logic thresholds are noise-immunity buffered. The 42 Ω impedance, while relatively high compared to some precision references, still provides adequate regulation for many analog tasks when paired with low-output-impedance drivers. However, in high-impedance sensor interfaces, the leakage current (2 µA @ 47.1V) could introduce offset errors; thus, the JANTX1N4977CUS/TR should be used with buffering when interfacing sensitive instrumentation amplifiers.

Can the JANTX1N4977CUS/TR be safely operated near its maximum power rating in continuous duty cycles, and how does this affect long-term reliability in harsh environments?: Operating continuously near 5W requires careful thermal management due to self-heating effects that can degrade junction integrity over time. Although the device passes rigorous military qualification testing, sustained operation above 3W in still-air environments risks exceeding safe operating area (SOA) limits without a heatsink. In automotive or industrial settings with elevated ambient temperatures, derating to ≤30–35% of rated power (1.5–1.8W) is recommended to ensure >10-year operational life. This conservative approach aligns with DO-212 and AEC-Q101 standards often referenced in mission-critical designs, where failure mode analysis favors graceful degradation over sudden burnout.

How do the leakage characteristics of the JANTX1N4977CUS/TR compare to newer silicon-carbide-based references, and what impact does this have on battery-powered systems with reverse-polarity protection?: With only 2 µA of reverse leakage at 47.1V, the JANTX1N4977CUS/TR exhibits significantly lower off-state current than many conventional silicon zeners, but not as low as modern SiC or GaN-based regulators. In battery-backed systems using reverse-polarity diodes, this leakage contributes minimally to standby drain—especially important in 24V industrial batteries where quiescent loss directly reduces runtime. However, for ultra-low-power IoT nodes operating on coin cells, even 2 µA may accumulate over days. Still, the JANTX1N4977CUS/TR remains viable for intermittent-use supervisory circuits rather than continuous monitoring, balancing ruggedness with modest power efficiency.

What considerations arise when cascading multiple JANTX1N4977CUS/TR devices for higher-voltage reference stacks?: Cascading two or more JANTX1N4977CUS/TR units in series can achieve voltages up to ~124V, leveraging their 62V nominal rating. However, cumulative tolerances—each ±2%—can result in worst-case deviation of ±4%, complicating calibration. Additionally, unequal current sharing due to slight device mismatches may cause one unit to bear disproportionate power, risking early failure. To mitigate this, designers should include ballast resistors in each leg and ensure tight thermal coupling. This configuration suits high-voltage ADC reference chains in test equipment but demands rigorous layout symmetry and post-trim calibration for precision applications.

Is the JANTX1N4977CUS/TR compatible with lead-free reflow soldering processes, and what precautions are needed during rework?: Yes, the JANTX1N4977CUS/TR is fully compatible with standard lead-free reflow profiles (e.g., peak 260°C, ramp-up <3°C/sec). Its ceramic construction resists thermal shock better than glass-passivated types. During hand rework, localized heating must be limited to <30 seconds below 260°C to avoid delamination or bond wire lift-off. Using a fine-tip soldering iron with grounded tip and airflow control minimizes stress. The E-MELF’s small size increases vulnerability to tip contact damage, so infrared preheating of the board is advised before touch-up work in field-service scenarios.

How does the military qualification (MIL-PRF-19500/356) benefit engineers specifying the JANTX1N4977CUS/TR in defense electronics compared to uncertified alternatives?: Military qualification ensures traceability, controlled manufacturing processes, and acceptance testing including life-cycle stress screening, which reduces infant mortality and random failures. For the JANTX1N4977CUS/TR, this translates to consistent 62V breakdown across batches and environments, critical in radiation-hardened-like applications even if not rad-tolerant itself. It simplifies procurement through QPL listings, streamlines audit trails, and satisfies ITAR documentation requirements. Uncertified parts, even if functionally similar, lack this assurance, increasing liability risk in safety-critical subsystems like missile guidance or secure comms where failure is unacceptable.

What role does the 1.5V forward voltage play in transient clamping scenarios, and how should it be managed in bidirectional protection circuits?: At 1A forward current, the JANTX1N4977CUS/TR exhibits a 1.5V drop, which becomes relevant during negative transients or avalanche events. In bidirectional TVS arrays, pairing it with a complementary device creates asymmetric clamping thresholds, potentially leading to unbalanced response. To manage this, designers often add a series resistor to limit forward current or use symmetric pairs with matched Vf characteristics. For surge protection in 28V MIL-STD-704 buses, this Vf ensures fast response but demands attention to power dissipation during fault conditions—especially if repeated surges occur, necessitating thermal modeling to prevent cumulative damage.

Parts with Similar Specifications

The three parts on the right have similar specifications to Microchip Technology JANTX1N4977CUS/TR

Product Attribute
Part Number	JANTX1N4976CUS/TR	JANTX1N4978CUS/TR	JANTX1N4977US/TR	JANTX1N4977DUS/TR
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology
Voltage - Zener (Nom) (Vz)	-	-	-	-
Tolerance	-	-	-	-
Power - Max	-	-	-	-
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Current - Reverse Leakage @ Vr	-	-	-	-
Series	-	-	-	-
Impedance (Max) (Zzt)	-	-	-	-
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Voltage - Forward (Vf) (Max) @ If	-	-	-	-
Supplier Device Package	-	196-NFBGA (12x12)	16-PDIP	64-VQFN (9x9)

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Customer Reviews

Evaluation: 10 Articles

Nord***mbedded

Jul 20, 2026

Reliable FPGA with predictable behavior. Configuration and testing went smoothly, making development faster than expected.
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.

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America	United States	5
America	Brazil	7
Europe	Germany	5
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Oceania	Australia	6
Oceania	New Zealand	5
Asia	India	4
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Middle East	Israel	6

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1.00kg-2.00kg	USD$40.00 - USD$80.00
2.00kg-3.00kg	USD$50.00 - USD$100.00

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