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P4SMA43A
NextGen Components
TVS Diode 400W 43V UNI SMA
300357 Pcs New Original In Stock
59.3V Clamp Ipp Tvs Diode Surface Mount DO-214AC, SMA
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5.0 / 5.0
- (115 Ratings)
P4SMA43A
Product Overview
2053672
DiGi Electronics Part Number
P4SMA43A-DGManufacturer
NextGen Components
P4SMA43A
Description
TVS Diode 400W 43V UNI SMAInventory
300357 Pcs New Original In Stock
59.3V Clamp Ipp Tvs Diode Surface Mount DO-214AC, SMA
Quantity
Minimum 1
Minimum 1
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P4SMA43A Technical Specifications
Category
Transient Voltage Suppressors (TVS), TVS Diodes
Packaging
Tape & Reel (TR)
Series
SMA
Product Status
Active
Type
Zener
Unidirectional Channels
1
Voltage - Reverse Standoff (Typ)
36.8V
Voltage - Breakdown (Min)
40.9V
Voltage - Clamping (Max) @ Ipp
59.3V
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
P4SMA43A-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-P4SMA43ATR
Standard Package
5,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
Ma commande a été expédiée rapidement et est arrivée en parfait état. La finesse de fabrication montre leur sérieux.
Dec 02, 2025
Die Preisvorteile bei DiGi Electronics machen das Einkaufen immer angenehm.
Dec 02, 2025
DiGi Electronics provides personalized support that truly addresses my needs.
Dec 02, 2025
Shipping was faster than I’ve experienced with other suppliers, and the parts are built to last under constant operation.
Dec 02, 2025
I am always satisfied with the quick turnaround times from DiGi Electronics.
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Frequently Asked Questions (FAQ)
When designing in the P4SMA43A for overvoltage protection, what are the key thermal and PCB layout considerations to ensure it can reliably handle repetitive ESD or surge events without premature failure?
When using the P4SMA43A in applications with frequent transient events, such as industrial controls or outdoor electronics, proper PCB thermal management is critical. Use wide copper traces (min 0.5mm) and connect the P4SMA43A directly to ground planes to dissipate heat from 400W peak pulses. Avoid daisy-chaining multiple TVS devices on the same node, which can lead to uneven clamping. Also, place the P4SMA43A as close as possible to the entry point of the transient (e.g., connectors) to minimize parasitic inductance, which otherwise increases let-through voltage. For sustained or repetitive surges, consider derating the device by 50% beyond its specified pulse rating to prevent thermal runaway, especially at elevated ambient temperatures near 100°C+.
How does the P4SMA43A compare to the SMAJ43A in terms of clamping performance and reliability under ISO 7637-2 automotive load dump conditions for 12V systems?
The P4SMA43A and SMAJ43A both have a nominal standoff voltage of 36.8V, but the P4SMA43A has a slightly lower clamping voltage (59.3V max @ Ipp) compared to many SMAJ variants, making it more effective at limiting let-through voltage during fast transients like ESD or EFT. However, neither device is specifically rated for full-energy automotive load dump (which can exceed 400W for 400ms), so the P4SMA43A should only be used for minor load dump events or complementary protection in 12V systems. For extended exposure, pair the P4SMA43A with a sacrificial varistor or bidirectional TVS with higher surge capability. Always verify IEC 61000-4-5 compliance using the actual circuit impedance and source resistance.
Can the P4SMA43A be used as a direct replacement for the SMCJ43A in a 24V industrial sensor circuit, and what are the risks due to package differences?
While the P4SMA43A and SMCJ43A share similar electrical specs (43V nominal, ~400W power rating), the P4SMA43A uses the smaller DO-214AC (SMA) package versus the DO-214AB (SMB) of the SMCJ43A, resulting in lower thermal mass and surge current capability under repetitive stress. Replacing SMCJ43A with P4SMA43A in a 24V industrial sensor circuit risks early degradation if exposed to frequent high-energy transients, especially at elevated temperatures. If retrofitting, ensure the transient energy (Ipp) stays below 75% of the P4SMA43A's rating and implement additional upstream filtering. Confirm footprint compatibility, as SMA and SMB are not pin-to-pin interchangeable.
What design risks arise when using the P4SMA43A to protect sensitive analog inputs, given its leakage current and capacitance characteristics?
The P4SMA43A, like most Zener-type TVS diodes, exhibits higher leakage current (typically in the µA range under reverse bias) compared to polymer ESD suppressors, which can affect high-impedance analog signal paths—especially in precision sensor circuits. Additionally, its junction capacitance (~150pF typical) may distort high-frequency analog signals or cause signal integrity issues in data lines above 1 MHz. To mitigate risks, use the P4SMA43A only on buffered or low-impedance analog nodes, and consider adding a series resistor to limit leakage effects. For sensitive analog inputs, evaluate lower-capacitance alternatives like ESD5V3U or CDSOD323 devices, and preserve signal fidelity.
Under what operating conditions might the P4SMA43A fail short-circuit, and how can circuit design minimize risk of fire or downstream damage?
The P4SMA43A may fail short-circuit when subjected to sustained overvoltage beyond its 400W peak pulse rating or excessive junction temperature (>150°C), particularly in poorly ventilated enclosures or with inadequate PCB heatsinking. A short-circuit failure in a power rail protection role could cause overheating or fire risk if no current-limiting mechanism exists. To mitigate, always pair the P4SMA43A with a fuse or PTC resettable fuse upstream—sized to clear before the TVS reaches thermal destruction energy. Additionally, monitor ambient temperature and avoid stacking multiple TVS devices without derating. Design for Class 2 insulation compliance by including appropriate creepage and clearance distances (≥2.5mm for 60V systems) around the DO-214AC package to prevent arcing.
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P4SMA43A CAD Models
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