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Vishay General Semiconductor - Diodes Division P4SMA400AHM3_A/I
- Part No.:
- P4SMA400AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA400AHM3_A/I.pdf
- Description:
- TVS DIODE 342VWM 548VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
P4SMA400AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for high-energy surge protection in power and signal lines. It features a 400 V standoff voltage (VWM), 459 V minimum breakdown voltage (VBR), 400 W peak pulse power rating (10/1000 µs), and clamps transients to ≤548 V at 0.55 A peak pulse current - deployed in automotive power supplies, industrial motor controllers, and telecom DC input stages.
For engineers reviewing the P4SMA400AHM3_A/I datasheet, P4SMA400AHM3_A/I pinout, P4SMA400AHM3_A/I application, or P4SMA400AHM3_A/I equivalent, key selection criteria include its AEC-Q101 qualification, SMA (DO-214AC) package compatibility with automated placement, low incremental surge resistance, and compliance with UL 497B for protector classification.
Technical Context
The P4SMA400AHM3_A/I operates as a unidirectional clamping device with glass-passivated junction technology, enabling fast response (<1 ns) to transient overvoltages. Its thermal resistance (RθJA = 120 °C/W) and maximum junction temperature of 150 °C support reliable operation under repetitive surge conditions when mounted on 5.0 mm × 5.0 mm copper pads.
It delivers 400 W peak pulse power per 10/1000 µs waveform at TA = 25 °C, derating linearly above 25 °C per Figure 2. The device exhibits a temperature coefficient of VBR of +0.110 %/°C and maintains <1.0 µA reverse leakage at VWM, ensuring minimal standby power loss in high-impedance circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 400 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working range. |
| VBR (min) | 459 V at IT = 1 mA - Minimum voltage at which device enters avalanche breakdown; ensures predictable clamping onset. |
| VC @ IPPM | 548 V at 0.55 A - Clamped voltage during 400 W surge; determines protected circuit's maximum stress level. |
| PPPM | 400 W (10/1000 µs) - Peak transient energy absorption capability; supports IEC 61000-4-5 Level 4 surge immunity. |
| IFSM | 40 A (8.3 ms half-sine) - Non-repetitive forward surge rating; enables robust handling of inductive turn-off spikes. |
| Junction Temp | –65 °C to +150 °C - Wide operating range suitable for under-hood automotive and industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.0 mm × 5.0 mm pad footprint; MSL Level 1, lead-free matte tin plating. |
Pinout & Package
Package: SMA (DO-214AC), molded epoxy case meeting UL 94 V-0 flammability rating; cathode indicated by band on body; terminals are matte tin plated, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-side reference in unidirectional configuration; completes clamping loop during positive transients. |
| Cathode | Reverse-biased terminal / Surge input node | Connected to protected line (e.g., 48 V rail); avalanche conduction initiates here during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - supports Tier-1 supply chain requirements. |
| 400 W peak pulse power | Withstands IEC 61000-4-5 combination wave surges up to 4 kV (open-circuit)/2 kA (short-circuit) without degradation. |
| Glass passivated junction | Ensures stable VBR tolerance (±5 %), low leakage (<1 µA), and long-term parametric stability under thermal stress. |
| Low profile SMA package | 0.208" × 0.157" footprint enables dense PCB layouts; compatible with standard SMT reflow profiles (peak 260 °C). |
| UL 497B recognized | QVGQ2 file E136766 certifies suitability for telecom and industrial surge protection systems requiring safety agency approval. |
Applications
| Automotive Power Rail Protection | Industrial DC Motor Drive Inputs |
|---|---|
Use Scenario: Protecting 48 V battery-fed ECUs against load dump and alternator surge events per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC/DC converter input to clamp transients within safe operating area. Use Value: Limits voltage to ≤548 V during 400 W surges, preventing damage to downstream MOSFETs and controller ICs rated for 600 V max. |
Use Scenario: Safeguarding 24–48 V DC inputs of variable-frequency drives against inductive kickback from contactor switching. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across input terminals to absorb repetitive 10/1000 µs transients generated by relay coil de-energization. Use Value: Maintains <1 µA leakage at 400 V, eliminating standby current drain while delivering 400 W clamping without thermal runaway. |
| Telecom DC Power Entry | Renewable Energy Charge Controller Inputs |
Use Scenario: Front-end surge suppression on -48 V telecom rectifier outputs exposed to lightning-induced surges on outdoor plant wiring. IC Role / Device Role / Timing Role: Primary clamping device upstream of hot-swap controllers and PMICs; coordinated with upstream GDTs for multi-stage protection. Use Value: UL 497B recognition and 400 W rating enable compliance with Telcordia GR-1089-CORE Level 3 surge requirements. |
Use Scenario: Input protection for solar charge controllers interfacing with 400 V PV arrays subject to rapid voltage transients during cloud-edge events. IC Role / Device Role / Timing Role: High-VWM TVS placed across MPPT input terminals to suppress fast-rising transients before they reach buck converter MOSFETs. Use Value: 459 V VBR min ensures no false triggering during normal 400 V array operation while clamping >500 V surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ400A-E3/52 (Vishay) | Same VWM/VBR specs but SMB package (DO-214AA); 600 W PPPM; RθJA = 100 °C/W. | Higher power handling and lower thermal resistance; requires larger PCB footprint (0.236" × 0.157"). | Select when higher surge margin or improved thermal performance is needed and board space allows SMB layout. |
| 1.5SMC400AHE3/A (Vishay) | Same electrical specs but SMC package (DO-214AB); 1500 W PPPM; RθJA = 50 °C/W; heavier (0.33 g). | Designed for heavy-duty industrial surges; not optimized for high-density automotive modules. | Choose for non-space-constrained applications requiring >1 kW surge capability and extended thermal endurance. |
Compared with SMBJ400A-E3/52 and 1.5SMC400AHE3/A, the P4SMA400AHM3_A/I offers optimal balance of AEC-Q101 compliance, compact SMA footprint, and 400 W surge capacity - making it preferred for automotive and space-limited industrial designs where MSL Level 1 and halogen-free construction are mandatory.
Availability
P4SMA400AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial motor controls, and telecom power entry applications requiring stable component supply, AEC-Q101 qualification, and RoHS/halogen-free compliance.
Supply support for P4SMA400AHM3_A/I 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 is engineered for high-reliability transient suppression in automotive, industrial, and telecom systems - combining AEC-Q101 qualification, UL recognition, and precise VWM/VBR control for robust system-level ESD and surge immunity.
FAQ
What is the maximum clamping voltage of the P4SMA400AHM3_A/I under surge conditions?
The P4SMA400AHM3_A/I clamps to a maximum of 548 V when subjected to its rated 400 W peak pulse power (10/1000 µs waveform) at 0.55 A peak pulse current. This value is measured per standard test conditions in the Vishay datasheet (Document Number: 88367, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during transient events. The P4SMA400AHM3_A/I maintains this clamping performance across its full operating temperature range.
Is the P4SMA400AHM3_A/I qualified for automotive use?
Yes, the P4SMA400AHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in the P4SMA Series datasheet. It meets stress test requirements including temperature cycling, high-temperature reverse bias, and ESD robustness required for automotive electronic control units. The P4SMA400AHM3_A/I is specifically intended for under-hood and chassis-mounted applications where reliability under thermal and mechanical stress is critical.
What does the "HM3" suffix indicate in P4SMA400AHM3_A/I?
The "HM3" suffix in P4SMA400AHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering information, "HM3" identifies the commercial-grade, halogen-free variant that also satisfies automotive reliability standards - distinct from "E3" (RoHS only) and "HE3" (AEC-Q101 + RoHS). The "_A/I" portion specifies revision A and 13-inch tape-and-reel packaging (7500 units per reel). The P4SMA400AHM3_A/I thus combines environmental compliance with automotive-grade validation.
Can the P4SMA400AHM3_A/I be used in bidirectional configurations?
No, the P4SMA400AHM3_A/I is a unidirectional TVS diode, as indicated by its part number ending in "A" (not "CA") and the absence of bidirectional VWM/VBR ranges in its electrical characteristics table. Bidirectional variants in the P4SMA family use the "CA" suffix (e.g., P4SMA400CA) and exhibit symmetric breakdown in both polarities. Using the P4SMA400AHM3_A/I in reverse-biased AC applications would result in forward conduction and failure. For bidirectional protection, select a verified CA-suffix part.
What is the thermal resistance of the P4SMA400AHM3_A/I, and how does it affect layout?
The P4SMA400AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet. This value assumes minimum recommended pad layout; reducing pad area increases thermal resistance and risks exceeding the 150 °C maximum junction temperature during repetitive surges. Layout must allocate adequate copper area and avoid thermal isolation - the P4SMA400AHM3_A/I relies on PCB copper for heat dissipation, not internal heatsinking.
P4SMA400AHM3_A/I 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/I FAQ
1.How can I place an order for P4SMA400AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA400AHM3_A/I 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/I reliable?
The price and inventory of P4SMA400AHM3_A/I 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/I is usually 5 days.
3.What payment methods are accepted for P4SMA400AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA400AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA400AHM3_A/I?
P4SMA400AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA400AHM3_A/I 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/I?
For technical support, including P4SMA400AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA400AHM3_A/I requirements.
6.How does Aetrix verify that P4SMA400AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All P4SMA400AHM3_A/I 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/I meets industry standards.
7.What is the process for return or replacement of P4SMA400AHM3_A/I?
All P4SMA400AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA400AHM3_A/I, 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/I part is unused and in its original packaging.
Return procedure for P4SMA400AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA400AHM3_A/I Tags
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