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Vishay General Semiconductor - Diodes Division P4SMA400AHM3_B/H
- Part No.:
- P4SMA400AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA400AHM3_B/H.pdf
- Description:
- TVS DIODE 342VWM 548VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,800
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Product details
Overview
P4SMA400AHM3_B/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the P4SMA series, designed for high-energy surge protection on power and signal lines. It features a 400 V standoff voltage (VWM), 459 V minimum breakdown voltage (VBR), 400 W peak pulse power rating at 10/1000 µs, 548 V maximum clamping voltage (VC) at rated IPPM, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the P4SMA400AHM3_B/H datasheet, P4SMA400AHM3_B/H pinout, P4SMA400AHM3_B/H application, or P4SMA400AHM3_B/H equivalent, this device is selected for robust overvoltage protection in automotive power modules, industrial DC bus lines, and telecom interface circuits where precise clamping, low leakage (<1 µA at VWM), and MSL Level 1 solderability are required.
Technical Context
The P4SMA400AHM3_B/H operates as a unidirectional avalanche diode with glass-passivated junction, delivering fast response to transients (<1 ns) and low incremental surge resistance. Its clamping behavior is defined by a 10/1000 µs waveform, with derated power above 91 V (300 W) and thermal resistance RθJA = 120 °C/W.
It supports automated SMT placement in SMA (DO-214AC) package, meets UL 94 V-0 flammability, and uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102. Polarity is marked by cathode band; no marking on bidirectional variants - but this part is unidirectional.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 400 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 459 V min at IT = 1 mA - Avalanche onset voltage; ensures predictable turn-on during surges without premature triggering. |
| VC (Clamping Voltage) | 548 V max at IPPM - Peak voltage seen by protected circuit during 400 W transient; critical for downstream IC/MOSFET voltage tolerance. |
| PPPM (Peak Pulse Power) | 400 W at 10/1000 µs - Energy-handling capability under standard surge waveform; enables protection against IEC 61000-4-5 Level 4 surges. |
| ID (Reverse Leakage) | <1 µA at VWM - Minimal standby current; preserves efficiency in always-on power rails and avoids false triggers in high-impedance sensing paths. |
| TJ max | 150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and enclosed industrial enclosures. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD; suitable for ASIL-B supporting subsystems. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to lower-potential side of protected line. | Used only during forward surge events (e.g., reverse polarity protection); not active in normal TVS clamping mode. |
| Cathode | Current exit point in reverse bias; connected to higher-potential side (e.g., VIN or signal line). | Primary clamping terminal - conducts avalanche current to ground when transient exceeds VWM, limiting voltage across load. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Enables single-event suppression of high-energy transients common in 24 V/48 V automotive and industrial power systems. |
| AEC-Q101 qualified (HM3 suffix) | Confirms reliability for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
| MSL Level 1, 260 °C reflow compatible | Supports lead-free assembly without moisture sensitivity concerns; eliminates pre-bake requirement in standard SMT lines. |
| Glass passivated junction | Ensures stable electrical characteristics over time and temperature; reduces parameter drift vs. epoxy-passivated alternatives. |
| Low reverse leakage (<1 µA) | Minimizes quiescent power loss and avoids loading of high-impedance reference or sensor circuits during normal operation. |
Applications
| Automotive Power Rail Protection | Industrial DC Bus Clamping |
|---|---|
Use Scenario: Protecting 48 V battery-fed ECUs from load dump and alternator switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and chassis ground to clamp surges up to ±120 V. Use Value: Limits peak voltage to 548 V, safeguarding 60 V-rated MOSFETs and PMICs without derating headroom. |
Use Scenario: Safeguarding PLC I/O modules connected to 24–48 V field wiring exposed to inductive kickback. IC Role / Device Role / Timing Role: Standoff-clamp TVS on supply input rail to absorb repetitive 400 W pulses from solenoid drivers. Use Value: Maintains system uptime by preventing latch-up or gate oxide damage in downstream logic and analog front-ends. |
| Telecom Interface Surge Shielding | Renewable Energy Charge Controller Input |
Use Scenario: Protecting RS-485 transceivers on outdoor base station backhaul links subject to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on VCC rail feeding isolated data interface ICs. Use Value: Fast <1 ns response and low VC ensure transceiver ICs remain within absolute maximum ratings during multi-kV transients. |
Use Scenario: Input protection for solar charge controllers handling variable PV array voltages up to 450 VDC. IC Role / Device Role / Timing Role: Overvoltage limiter on MPPT input stage to prevent damage from open-circuit voltage spikes. Use Value: Withstands 400 V nominal input while clamping transients to 548 V - aligning with 600 V-rated MOSFET and capacitor ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ400A-E3/5A | Same VWM (400 V), lower PPPM (400 W), but non-AEC-Q101; RθJA = 120 °C/W identical; DO-214AC package. | Commercial-grade only; unsuitable for automotive production; acceptable for industrial prototypes or cost-sensitive consumer designs. | Select when AEC-Q101 compliance is not required and traceability to Vishay's HM3 automotive flow is unnecessary. |
| 1.5SMC400A | Higher package thermal mass (DO-214AB), same VWM/VC specs, but lower MSL rating (Level 2), no AEC-Q101 qualification. | Larger footprint limits PCB density; less suitable for space-constrained automotive modules; requires pre-bake for lead-free reflow. | Choose only if existing board layout uses SMC package and redesign is prohibitive; verify thermal performance with reduced pad area. |
Compared with SMAJ400A-E3/5A and 1.5SMC400A, the P4SMA400AHM3_B/H uniquely combines AEC-Q101 qualification, MSL Level 1 compatibility, and DO-214AC footprint - making it the only drop-in solution for automotive Tier-1 power rail protection requiring zero layout change and full process traceability.
Availability
P4SMA400AHM3_B/H is available at Aetrix Electronics and suitable for automotive power distribution units, industrial programmable logic controllers, and renewable energy charge controllers requiring stable component supply, long-term lifecycle support, and automotive-grade consistency.
Supply support for P4SMA400AHM3_B/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, precision, and automotive qualification.
The P4SMA series was engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping, low leakage, and AEC-Q101 validation are mandatory.
FAQ
What is the maximum clamping voltage of the P4SMA400AHM3_B/H under rated surge conditions?
The P4SMA400AHM3_B/H has a maximum clamping voltage (VC) of 548 V when subjected to its rated peak pulse current (IPPM) under a 10/1000 µs waveform. This value is measured at the specified IPPM derived from its 400 W peak pulse power rating and is guaranteed across the full operating temperature range of -65 °C to +150 °C. The P4SMA400AHM3_B/H maintains this clamping performance without degradation due to its glass-passivated junction and AEC-Q101-qualified construction.
Is the P4SMA400AHM3_B/H suitable for automotive applications?
Yes, the P4SMA400AHM3_B/H is explicitly AEC-Q101 qualified, as confirmed by its HM3 suffix and Vishay documentation revision 09-Jan-2024. It undergoes stress testing for high-temperature operating life, temperature cycling, and ESD robustness required for automotive electronics. The P4SMA400AHM3_B/H is approved for use in engine control modules, body control units, and ADAS power supplies where sustained reliability under thermal and electrical stress is critical.
What does the "B/H" suffix in P4SMA400AHM3_B/H indicate?
The "B" denotes the revision level for P4SMA250A through P4SMA540A devices per Vishay's ordering matrix, confirming compliance with the latest specification revision. The "H" indicates packaging in 7-inch plastic tape and reel with 1800 units per reel. The full suffix "HM3_B/H" confirms halogen-free, RoHS-compliant, AEC-Q101-qualified construction in SMA (DO-214AC) package - all verified in Document Number 88367.
How does the P4SMA400AHM3_B/H compare to bidirectional TVS diodes in surge protection?
The P4SMA400AHM3_B/H is unidirectional and intended for DC line protection where polarity is fixed - such as positive supply rails referenced to ground. Unlike bidirectional variants (e.g., P4SMA400CA), it provides forward conduction capability and lower capacitance in reverse bias. The P4SMA400AHM3_B/H delivers tighter VBR tolerance and superior clamping consistency for asymmetric transients, making it preferred for automotive battery feeds and industrial DC buses where reverse-voltage fault protection is also needed.
What is the thermal resistance and power derating behavior of the P4SMA400AHM3_B/H?
The P4SMA400AHM3_B/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads. Its peak pulse power derates linearly above 25 °C ambient, dropping to ~240 W at 85 °C and ~120 W at 125 °C per Vishay Figure 2. Continuous power dissipation (PD) remains 3.3 W up to 50 °C on infinite heatsink. The P4SMA400AHM3_B/H must be routed with adequate copper area to maintain safe junction temperatures during repetitive surge events.
P4SMA400AHM3_B/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):
- 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:
- -
- 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_B/H FAQ
1.How can I place an order for P4SMA400AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA400AHM3_B/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_B/H reliable?
The price and inventory of P4SMA400AHM3_B/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_B/H is usually 5 days.
3.What payment methods are accepted for P4SMA400AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA400AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA400AHM3_B/H?
P4SMA400AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA400AHM3_B/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_B/H?
For technical support, including P4SMA400AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA400AHM3_B/H requirements.
6.How does Aetrix verify that P4SMA400AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All P4SMA400AHM3_B/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_B/H meets industry standards.
7.What is the process for return or replacement of P4SMA400AHM3_B/H?
All P4SMA400AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA400AHM3_B/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_B/H part is unused and in its original packaging.
Return procedure for P4SMA400AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA400AHM3_B/H Tags
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