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Vishay General Semiconductor - Diodes Division P4SMA18AHM3_A/H
- Part No.:
- P4SMA18AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA18AHM3_A/H.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,525
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Product details
Overview
P4SMA18AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, rated for 18 V breakdown voltage (VBR = 17.1–18.9 V at 1 mA), 15.3 V standoff voltage (VWM), and 25.2 V clamping voltage (VC) at 15.9 A peak pulse current (IPPM). It delivers 400 W peak pulse power (10/1000 µs waveform) and is AEC-Q101 qualified for automotive-grade reliability in power rail and signal line protection.
For engineers reviewing the P4SMA18AHM3_A/H datasheet, P4SMA18AHM3_A/H pinout, P4SMA18AHM3_A/H application, or P4SMA18AHM3_A/H equivalent, this device is selected for robust ESD and surge immunity in automotive sensor interfaces, DC-DC converter input rails, and industrial I/O protection where low clamping voltage, fast response (<1 ns), and halogen-free RoHS compliance are required.
Technical Context
The P4SMA18AHM3_A/H operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-nanosecond response to transients. Its 15.3 V working voltage allows safe operation across 12 V nominal automotive systems while maintaining margin against normal operating fluctuations.
Clamping at 25.2 V under 15.9 A (10/1000 µs) ensures MOSFET gate drivers and microcontroller I/O pins remain below absolute maximum ratings during load dump or inductive switching events. Thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead) supports reliable operation up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - defines precise avalanche initiation threshold for predictable clamping onset |
| VWM | 15.3 V - maximum continuous reverse voltage before leakage exceeds 1 µA, compatible with 12 V system rails |
| VC @ IPPM | 25.2 V at 15.9 A - limits transient voltage seen by downstream ICs during 400 W surge events |
| PPPM | 400 W (10/1000 µs) - handles automotive load dump and ISO 7637-2 Pulse 1/2a/5a without failure |
| IFSM | 40 A (8.3 ms half-sine) - withstands repetitive inrush or fault currents in power supply inputs |
| TJ max | 150 °C - enables use in under-hood automotive environments and high-temperature industrial enclosures |
| Package | SMA (DO-214AC) - industry-standard SMD footprint with 5.0 mm × 5.0 mm copper pad thermal relief per terminal |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads. Cathode indicated by band on body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line (e.g., 12 V rail); conducts surge current to ground when V > VBR |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units, ADAS sensors, and body electronics |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets IEC 61249-2-21 and JEDEC J-STD-020 MSL Level 1 (260 °C peak reflow) |
| 400 W peak pulse power (10/1000 µs) | Supports ISO 16750-2 and ISO 7637-2 compliance testing without derating above 91 V |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ESD ±30 kV contact discharge) |
| Glass passivated junction | Ensures stable VBR over lifetime and resistance to humidity-induced degradation |
Applications
| Automotive Sensor Interface Protection | 12 V Power Rail Surge Suppression |
|---|---|
|
Use Scenario: Protecting CAN/LIN transceivers and analog sensor outputs (e.g., pressure, temperature) from ESD and coupled noise in vehicle cabins. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and ground, clamping transients before they reach IC input structures. Use Value: Clamps to 25.2 V at 15.9 A, keeping sensor ICs within their 30 V absolute maximum rating while surviving repeated 15 kV ESD events. |
Use Scenario: Safeguarding 12 V supply inputs to infotainment head units and telematics modules against load dump (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Primary front-end TVS on main power entry, absorbing up to 400 W surges before upstream fusing activates. Use Value: Withstands 40 A surge current (8.3 ms) and maintains <1 µA leakage at 15.3 V, ensuring no standby power penalty. |
| Industrial PLC Digital Input Protection | DC-DC Converter Input Stage Protection |
|
Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from field-wiring induced transients and relay coil kickback. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to common ground, placed directly at connector entry point. Use Value: Fast response (<1 ns) prevents latch-up in input buffer ICs; 150 °C max junction temperature supports operation in sealed enclosures. |
Use Scenario: Protecting buck converter ICs (e.g., LM5164) from voltage spikes generated by long input traces or hot-plug events. IC Role / Device Role / Timing Role: TVS placed between VIN and GND, upstream of input capacitor, to limit spike amplitude before regulation stage. Use Value: 25.2 V clamping ensures converter ICs with 32 V max VIN (e.g., MPQ4572) operate safely without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18AHE3/A | Same VBR range (17.1–18.9 V), identical SMA package, but rated for 400 W only up to 91 V; not AEC-Q101 qualified | Limited to commercial-grade industrial and consumer applications; lacks automotive qualification documentation | Select when AEC-Q101 is not required and cost sensitivity outweighs qualification needs |
| 1.5SMC18A | Higher package thermal mass (SMC/DO-214AB), 400 W rating maintained above 91 V, but larger footprint (7.11 mm × 6.22 mm) and no AEC-Q101 option | Suitable for high-reliability non-automotive systems needing higher sustained surge handling; incompatible with space-constrained layouts | Choose when board area permits larger package and thermal performance under repetitive surges is prioritized |
Compared with SMAJ18AHE3/A and 1.5SMC18A, the P4SMA18AHM3_A/H uniquely combines AEC-Q101 qualification, halogen-free construction, and compact SMA footprint-making it the only drop-in solution for automotive production where both regulatory compliance and PCB real estate are constrained.
Availability
P4SMA18AHM3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, and DC-DC converter designs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for production programs.
Supply support for P4SMA18AHM3_A/H includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The P4SMA Series was developed for high-volume, space-constrained transient suppression in automotive and industrial systems-prioritizing AEC-Q101 compliance, low-profile packaging, and consistent clamping performance across temperature and lifetime.
FAQ
What is the clamping voltage of the P4SMA18AHM3_A/H under standard test conditions?
The P4SMA18AHM3_A/H has a maximum clamping voltage (VC) of 25.2 V at 15.9 A peak pulse current using the 10/1000 µs waveform. This value is measured per JEDEC standards and guarantees that downstream circuitry remains protected below critical voltage thresholds during surge events. The P4SMA18AHM3_A/H achieves this with low dynamic impedance, minimizing overshoot during fast transients.
Is the P4SMA18AHM3_A/H suitable for automotive applications?
Yes, the P4SMA18AHM3_A/H is AEC-Q101 qualified and specifically designed for automotive use, including engine control, body electronics, and ADAS sensor interfaces. Its halogen-free (HM3) construction, MSL Level 1 reflow compatibility, and guaranteed performance from –65 °C to +150 °C make the P4SMA18AHM3_A/H compliant with stringent automotive reliability requirements.
What does the "HM3" suffix indicate in P4SMA18AHM3_A/H?
The "HM3" suffix denotes halogen-free, RoHS-compliant construction meeting JEDEC J-STD-020 MSL Level 1 (peak reflow temperature 260 °C) and JESD 201 Class 2 whisker resistance. It distinguishes the P4SMA18AHM3_A/H from commercial-grade E3 variants and confirms its suitability for environmentally regulated automotive and industrial production.
How does the P4SMA18AHM3_A/H differ from bidirectional TVS diodes like P4SMA18CA?
The P4SMA18AHM3_A/H is unidirectional and intended for DC line protection where polarity is fixed (e.g., 12 V rail to ground), offering lower leakage and tighter VBR tolerance than bidirectional versions. In contrast, P4SMA18CA protects AC or polarity-agnostic lines but exhibits higher reverse leakage and symmetric clamping. The P4SMA18AHM3_A/H is not interchangeable with P4SMA18CA without circuit redesign.
What is the maximum operating temperature for the P4SMA18AHM3_A/H?
The P4SMA18AHM3_A/H has a maximum junction temperature (TJ) of +150 °C and operates across –65 °C to +150 °C. Its thermal resistance (RθJA = 120 °C/W) assumes mounting on 0.2" × 0.2" copper pads; proper PCB layout is essential to maintain this rating. Derating curves in the datasheet confirm usable power dissipation at elevated ambient temperatures, critical for under-hood automotive deployment of the P4SMA18AHM3_A/H.
P4SMA18AHM3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- P4SMA, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.2V
- Current - Peak Pulse (10/1000µs):
- 15.9A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA18AHM3_A/H FAQ
1.How can I place an order for P4SMA18AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA18AHM3_A/H on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for P4SMA18AHM3_A/H reliable?
The price and inventory of P4SMA18AHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA18AHM3_A/H is usually 5 days.
3.What payment methods are accepted for P4SMA18AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA18AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA18AHM3_A/H?
P4SMA18AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA18AHM3_A/H order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for P4SMA18AHM3_A/H?
For technical support, including P4SMA18AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA18AHM3_A/H requirements.
6.How does Aetrix verify that P4SMA18AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All P4SMA18AHM3_A/H products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that P4SMA18AHM3_A/H meets industry standards.
7.What is the process for return or replacement of P4SMA18AHM3_A/H?
All P4SMA18AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA18AHM3_A/H, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The P4SMA18AHM3_A/H part is unused and in its original packaging.
Return procedure for P4SMA18AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA18AHM3_A/H Tags
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