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P4SMA18A
NextGen Components
TVS Diode 400W 18V UNI SMA
165126 Pcs New Original In Stock
25.5V Clamp Ipp Tvs Diode Surface Mount DO-214AC, SMA
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5.0 / 5.0
- (328 Ratings)
P4SMA18A
Product Overview
2051551
DiGi Electronics Part Number
P4SMA18A-DGManufacturer
NextGen Components
P4SMA18A
Description
TVS Diode 400W 18V UNI SMAInventory
165126 Pcs New Original In Stock
25.5V Clamp Ipp Tvs Diode Surface Mount DO-214AC, SMA
Quantity
Minimum 1
Minimum 1
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P4SMA18A 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)
15.3V
Voltage - Breakdown (Min)
17.1V
Voltage - Clamping (Max) @ Ipp
25.5V
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
P4SMA18A-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-P4SMA18ATR
Standard Package
5,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
Ich habe die schnelle Lieferung sehr geschätzt, genauso wie den freundlichen Kontakt nach dem Kauf.
Dec 02, 2025
They prioritize customer satisfaction through reliable support and consistent products.
Dec 02, 2025
Their consistent product quality keeps me coming back.
Dec 02, 2025
They respond to our post-sale requests faster than expected, showcasing excellent service.
Dec 02, 2025
DiGi Electronics ensured quick shipping and provided great support.
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Frequently Asked Questions (FAQ)
When designing in the P4SMA18A for automotive load dump protection, what voltage margin should I consider to avoid premature clamping during transient spikes?
The P4SMA18A has a reverse standoff voltage of 15.3V, meaning it begins to conduct near this level. In automotive applications where brief load dump transients can reach 24V, ensure your normal operating voltage stays below 15.3V to prevent leakage or aging. Use the P4SMA18A only if your system’s maximum steady-state voltage is well under 15.3V, and rely on its 25.5V clamping voltage at peak pulse current to protect downstream components during actual surges. Consider series impedance to limit leakage if borderline voltage levels are expected.
Can the P4SMA18A replace a SMBJ18A in a high-temperature industrial control circuit, and what are the key trade-offs in surge handling?
Yes, the P4SMA18A can replace the SMBJ18A in many cases, but note that the SMBJ18A (SMB package) has a higher 600W peak pulse rating versus the P4SMA18A’s 400W. If your application involves repetitive or high-energy transients (e.g., in motor drives), the lower power rating of the P4SMA18A may lead to accelerated wear or thermal runaway at elevated temperatures near 150°C. Ensure Ipp stays within datasheet limits and verify PCB copper cooling is sufficient for the DO-214AC package to avoid thermal overstress in compact designs.
How do I determine if the P4SMA18A provides sufficient protection for a 12V microcontroller sensor input in an electromagnetically noisy environment?
For 12V sensor lines exposed to EMI or relay switching noise, the P4SMA18A’s 15.3V standoff and 25.5V clamping are suitable as long as the sensor’s maximum input voltage rating exceeds 25.5V. However, due to its unidirectional nature, it only suppresses positive transients—ensure negative spikes are handled separately if present. Pair the P4SMA18A with a series current-limiting resistor (e.g., 10–100Ω) to reduce stress on the diode and prevent latch-up in the MCU. Be cautious in high-capacitance signal lines, as the P4SMA18A’s junction capacitance (~50pF typical) may affect signal rise times.
What PCB layout practices minimize thermal stress on the P4SMA18A during frequent ESD events in portable equipment?
To enhance reliability of the P4SMA18A during repeated ESD discharges, maximize thermal dissipation by using generous copper pours connected to its anode and cathode pads on the top layer, ideally extending to internal ground planes via multiple vias. Avoid narrow traces that increase thermal resistance. Place the P4SMA18A as close as possible to the entry point (e.g., USB port or button) to minimize trace inductance that can cause voltage overshoot beyond 25.5V. Use short, direct paths to shunt energy quickly and prevent PCB tracking damage over time.
Is the P4SMA18A a reliable drop-in replacement for the SMF18A in space-constrained consumer devices, and how does surge resilience compare?
While both the P4SMA18A and SMF18A are SMA-sized unidirectional TVS diodes with similar voltage ratings, the P4SMA18A has a higher 400W peak pulse rating versus SMF18A’s 150W, making it more robust for surge events like ESD (IEC 61000-4-2) or cable discharge. However, ensure your design accounts for slightly higher leakage current in the P4SMA18A at elevated temperatures. For compact designs, the P4SMA18A offers better surge resilience in the same DO-214AC footprint, but validate clamping performance under actual system load conditions to confirm protection adequacy.
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.
P4SMA18A CAD Models
NextGen Components P4SMA18A PCB symbols & footprints
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