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Vishay General Semiconductor - Diodes Division P4SMA400AHM3_A/H
- Part No.:
- P4SMA400AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA400AHM3_A/H.pdf
- Description:
- TVS DIODE 342VWM 548VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,519
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Product details
Overview
P4SMA400AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, rated for 400 W peak pulse power (10/1000 µs), 342 V standoff voltage (VWM), and 548 V clamping voltage (VC) at 0.55 A peak pulse current. It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients and lightning surges in industrial and automotive electronics.
For engineers reviewing the P4SMA400AHM3_A/H datasheet, P4SMA400AHM3_A/H pinout, P4SMA400AHM3_A/H application, or P4SMA400AHM3_A/H equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant construction (HM3 suffix), 150 °C max junction temperature, and compatibility with automated SMT placement on standard 0.2" × 0.2" copper pads.
Technical Context
This device operates as a unidirectional clamping TVS diode-conducting only during reverse overvoltage events-with a glass-passivated junction enabling fast response (<1 ns) and low incremental surge resistance. Its breakdown voltage (VBR) is specified at 380–420 V (min/max) with 1 mA test current, and it exhibits a +0.110 %/°C temperature coefficient of VBR.
The P4SMA400AHM3_A/H is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), dissipates 3.3 W continuously at TA = 50 °C, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 342 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin below breakdown. |
| VBR (min/max) | 380 V / 420 V - Breakdown voltage range at 1 mA; ensures reliable turn-on within defined tolerance under transient stress. |
| VC @ IPPM | 548 V - Clamping voltage at 0.55 A peak pulse current (10/1000 µs); limits downstream voltage stress during surge events. |
| PPPM | 400 W - Peak pulse power handling capability; supports robust protection against high-energy transients per industry standard waveform. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); enables survival of brief inrush or fault currents. |
| TJ max | 150 °C - Maximum junction temperature; allows operation in under-hood automotive and high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount package with 0.2" × 0.2" pad layout recommendation; compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential rail in unidirectional configuration; carries surge current during clamping. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., power rail or signal); initiates avalanche breakdown when VLINE exceeds VWM. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing-enables use in engine control, ADAS, and body electronics. |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance requirements for global OEM supply chains without compromising surge robustness or thermal performance. |
| 400 W peak pulse power (10/1000 µs) | Provides higher energy absorption than standard 200 W TVS devices-suitable for protecting high-voltage DC bus lines in motor drives and power supplies. |
| Glass passivated junction | Ensures stable leakage current (<1 µA at VWM), low capacitance (~30 pF at 0 V), and consistent clamping behavior across temperature and lifetime. |
| MSL Level 1 (260 °C peak) | Supports single-reflow assembly without moisture sensitivity concerns-eliminates bake-out requirement and reduces manufacturing cost. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 24 V/48 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp spikes up to ±100 V. Use Value: Withstands 400 W surges while limiting clamped voltage to 548 V-prevents damage to downstream PMICs and microcontrollers. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation systems. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across differential signal pair to suppress EFT and ESD without distorting signal integrity. Use Value: 30 pF typical junction capacitance minimizes high-frequency attenuation; 342 V VWM accommodates wide common-mode swing in 4–20 mA loops. |
| Telecom DC Power Input Protection | MOSFET Gate Driver Surge Suppression |
Use Scenario: Safeguarding PoE-powered equipment inputs against lightning-induced surges on 48–57 V DC feeds. IC Role / Device Role / Timing Role: Primary-level TVS mounted at board edge to divert >1 kV transients before reaching DC-DC converters. Use Value: 548 V clamping voltage ensures secondary-side components remain within absolute maximum ratings even during worst-case surge events. |
Use Scenario: Preventing gate oxide failure in high-side N-channel MOSFETs driven by isolated gate drivers in motor inverters. IC Role / Device Role / Timing Role: TVS placed between gate and source to clamp Miller-induced voltage spikes during fast switching transitions. Use Value: Sub-1 ns response time captures nanosecond-scale dv/dt spikes; 0.110 %/°C VBR TC ensures stable clamping across -40 to +125 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ400A | Same VWM (342 V), but SMB package (DO-214AA); 600 W PPPM; higher RθJA (150 °C/W) | Better surge handling but larger footprint; less suitable for dense layouts where SMA is preferred | Select SMBJ400A only if higher pulse power margin is required and PCB space permits larger package. |
| SMCJ400A | Same VWM, but SMC package (DO-214AB); 1500 W PPPM; 10× larger footprint; RθJA = 100 °C/W | Designed for heavy-duty industrial mains input protection-not optimized for signal-line or compact board-edge use | Choose SMCJ400A for primary AC/DC front-end protection; avoid for space-constrained or signal-integrity-sensitive designs. |
Compared with SMBJ400A and SMCJ400A, the P4SMA400AHM3_A/H delivers optimal balance of surge robustness, miniaturization, and automotive qualification in the smallest standardized surface-mount TVS package-making it ideal for board-edge protection where footprint, thermal management, and AEC-Q101 compliance are jointly critical.
Availability
P4SMA400AHM3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, telecom power inputs, and MOSFET gate driver circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for P4SMA400AHM3_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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The P4SMA series is designed for high-reliability transient suppression in automotive, industrial, and telecom systems-delivering standardized surge protection with AEC-Q101 qualification, halogen-free materials, and tight parametric control across voltage grades.
FAQ
What is the clamping voltage of the P4SMA400AHM3_A/H at its rated peak pulse current?
The P4SMA400AHM3_A/H has a maximum clamping voltage (VC) of 548 V at its specified peak pulse current (IPPM) of 0.55 A under the 10/1000 µs waveform. This value is measured per Figure 1 in the Vishay datasheet (Document Number: 88367) and defines the upper voltage limit imposed on protected circuitry during a surge event. The P4SMA400AHM3_A/H maintains this clamping performance across its full operating temperature range.
Is the P4SMA400AHM3_A/H suitable for automotive applications?
Yes, the P4SMA400AHM3_A/H is AEC-Q101 qualified (as indicated by the HM3 suffix), meaning it has passed rigorous stress tests including temperature cycling, highly accelerated life testing, and ESD verification. Its 150 °C maximum junction temperature, MSL Level 1 rating, and halogen-free RoHS compliance make the P4SMA400AHM3_A/H appropriate for under-hood and body-control module applications in passenger and commercial vehicles.
What does the "HM3" suffix mean in P4SMA400AHM3_A/H?
The "HM3" suffix in P4SMA400AHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade E3/M3 versions and confirms compliance with automotive environmental and reliability standards. The "_A/H" further specifies packaging: "A" indicates revision level, and "H" denotes 1800-unit 7-inch tape-and-reel delivery format.
How does the P4SMA400AHM3_A/H compare to bidirectional TVS diodes?
The P4SMA400AHM3_A/H is unidirectional and intended for DC line protection where polarity is fixed-e.g., positive supply rails referenced to ground. Unlike bidirectional variants (e.g., P4SMA400CA), it conducts only in reverse bias and blocks forward current above ~1.2 V. This makes the P4SMA400AHM3_A/H unsuitable for AC-coupled or floating signal lines but more efficient for polarized power domains due to lower leakage and tighter VBR tolerance.
What is the thermal resistance of the P4SMA400AHM3_A/H, and how does it affect PCB layout?
The P4SMA400AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W. To maintain safe operation at full 3.3 W power dissipation, the PCB must use minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Reducing pad size increases thermal impedance and risks exceeding the 150 °C TJ limit-so the P4SMA400AHM3_A/H requires strict adherence to Vishay's mounting guidelines.
P4SMA400AHM3_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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 342V
- Voltage - Breakdown (Min):
- 380V
- Voltage - Clamping (Max) @ Ipp:
- 548V
- Current - Peak Pulse (10/1000µs):
- 550mA
- 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)
P4SMA400AHM3_A/H FAQ
1.How can I place an order for P4SMA400AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA400AHM3_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 P4SMA400AHM3_A/H reliable?
The price and inventory of P4SMA400AHM3_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 P4SMA400AHM3_A/H is usually 5 days.
3.What payment methods are accepted for P4SMA400AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA400AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA400AHM3_A/H?
P4SMA400AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA400AHM3_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 P4SMA400AHM3_A/H?
For technical support, including P4SMA400AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA400AHM3_A/H requirements.
6.How does Aetrix verify that P4SMA400AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All P4SMA400AHM3_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 P4SMA400AHM3_A/H meets industry standards.
7.What is the process for return or replacement of P4SMA400AHM3_A/H?
All P4SMA400AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA400AHM3_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 P4SMA400AHM3_A/H part is unused and in its original packaging.
Return procedure for P4SMA400AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA400AHM3_A/H Tags
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