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P4SMA39A
NextGen Components
TVS Diode 400W 39V UNI SMA
2459 Pcs New Original In Stock
53.9V Clamp Ipp Tvs Diode Surface Mount DO-214AC, SMA
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5.0 / 5.0
- (80 Ratings)
P4SMA39A
Product Overview
2052391
DiGi Electronics Part Number
P4SMA39A-DGManufacturer
NextGen Components
P4SMA39A
Description
TVS Diode 400W 39V UNI SMAInventory
2459 Pcs New Original In Stock
53.9V Clamp Ipp Tvs Diode Surface Mount DO-214AC, SMA
Quantity
Minimum 1
Minimum 1
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P4SMA39A Technical Specifications
Category
Transient Voltage Suppressors (TVS), TVS Diodes
Packaging
-
Series
SMA
Product Status
Active
Type
Zener
Unidirectional Channels
1
Voltage - Reverse Standoff (Typ)
33.3V
Voltage - Breakdown (Min)
37.1V
Voltage - Clamping (Max) @ Ipp
53.9V
Power - Peak Pulse
400W
Power Line Protection
No
Applications
General Purpose
Operating Temperature
-50°C ~ 150°C (TJ)
Mounting Type
Surface Mount
Package / Case
DO-214AC, SMA
Supplier Device Package
DO-214AC, SMA
Datasheet & Documents
HTML Datasheet
P4SMA39A-DG
Environmental & Export Classification
RoHS Status
RoHS Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8541.10.0080
Additional Information
Other Names
3372-P4SMA39ATR
Standard Package
5,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
Je suis impressionné par la vitesse d’expédition, et la qualité des composants est très durable. Parfait pour des usages intensifs.
Dec 02, 2025
Je suis enchanté par la performance de leurs produits et leur prix accessible.
Dec 02, 2025
在庫管理がしっかりしており、常に必要な商品が揃っています。
Dec 02, 2025
The sustainable packaging was well-designed to minimize environmental impact.
Dec 02, 2025
DiGi Electronics’s tracking system allows me to monitor my order closely from warehouse to doorstep.
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Frequently Asked Questions (FAQ)
What are the key design-in risks when using the P4SMA39A for transient protection in a 24V automotive circuit, and how can voltage tolerance stacking affect reliability?
When designing the P4SMA39A into a 24V automotive system, the primary risk is voltage tolerance accumulation between the normal operating voltage and the TVS breakdown threshold. The P4SMA39A has a minimum breakdown voltage of 37.1V, which is close to peak load dump transients (which can reach 40V). If the system regularly experiences sustained over-voltages near 37V, the P4SMA39A may enter conduction prematurely, leading to thermal runaway due to its 400W peak pulse rating not being designed for continuous clamping. To mitigate this, ensure the normal maximum operating voltage (including tolerances) remains at least 15% below 37.1V, or consider a higher standoff part like the P4SMA43A for better margin. Also, verify PCB thermal relief and trace width to handle possible pulse events without degrading the P4SMA39A over time.
Can the P4SMA39A replace the SMAJ39A in an existing design, and what are the practical differences that could impact surge robustness?
While both the P4SMA39A and SMAJ39A are unidirectional 400W SMA TVS diodes with similar clamping voltages, direct replacement requires caution. The P4SMA39A has a slightly higher max clamping voltage (53.9V vs SMAJ39A's typical 58.1V), but differences in internal die construction and dynamic resistance may affect response to fast transients like ESD or EFT. In high-noise environments, the P4SMA39A may clamp more efficiently due to lower internal inductance in NextGen Components' manufacturing process. However, if the original design relied on the SMAJ39A's exact thermal performance or time-current characteristics, validate with pulse testing using an 8/20μs waveform. Also, confirm that the P4SMA39A’s MSL 1 rating doesn’t introduce handling issues in humid production environments.
How does the P4SMA39A perform in high-temperature environments above 100°C, and what derating strategy should be applied for long-term reliability?
The P4SMA39A is rated for junction temperatures up to 150°C, but its leakage current increases significantly near upper limits, especially above 100°C. In high-temp applications like engine control modules, uncontrolled leakage can degrade system efficiency or trigger false faults in sensitive monitoring circuits. To ensure reliability, derate the peak pulse power by at least 50% when ambient temperatures exceed 100°C, assuming still air and standard FR-4 PCB layout. Use thermal vias under the SMA footprint to improve heat dissipation, and avoid placing the P4SMA39A near heat-generating components. Monitor leakage current during HALT testing to detect early signs of degradation.
What PCB layout considerations are critical when integrating the P4SMA39A for effective ESD protection in compact consumer electronics?
For optimal ESD protection with the P4SMA39A in space-constrained designs, minimize trace length between the protected node and the TVS to reduce inductive ringing during fast transients. Route the P4SMA39A as close as possible to the connector or entry point, with direct, short traces to ground (avoid vias in the signal path). Use a solid ground plane and at least two vias (≤1mm diameter) near the cathode to lower impedance. Due to the DO-214AC (SMA) package’s asymmetry, ensure adequate creepage distance (≥0.8mm) to adjacent pads to prevent arcing under high humidity. Remember: even with the P4SMA39A’s low clamping voltage, poor layout can increase residual voltage by 30–50%, defeating protection goals.
In what scenarios should you avoid using the P4SMA39A despite its 400W rating, and what are better alternatives for sustained overvoltage events?
Avoid using the P4SMA39A in applications with sustained overvoltage conditions (e.g., >1ms duration), such as power supply latch-up or regulator failure, because it’s designed only for transient suppression (8/20μs pulses), not continuous power dissipation. In such cases, the P4SMA39A may fail short-circuit due to thermal overload, potentially causing system damage. Instead, pair it with upstream protection like a polyfuse or use a higher-energy alternative such as the 1.5KE series (e.g., 1.5KE39A) in DO-15, which offers 1500W peak power and better thermal mass. For dual protection (transient + overvoltage), consider combining the P4SMA39A with a crowbar circuit or OVP IC for fail-safe operation.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
P4SMA39A CAD Models
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