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Vishay General Semiconductor - Diodes Division P4SMA400AHM3_B/I
- Part No.:
- P4SMA400AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA400AHM3_B/I.pdf
- Description:
- TVS DIODE 342VWM 548VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
P4SMA400AHM3_B/I 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 (10/1000 µs), 0.55 A maximum peak pulse current (IPPM), and operates across -65 °C to +150 °C junction temperature range - deployed in automotive power supply rails and industrial sensor interfaces.
For engineers reviewing the P4SMA400AHM3_B/I datasheet, P4SMA400AHM3_B/I pinout, P4SMA400AHM3_B/I application, or P4SMA400AHM3_B/I equivalent, key selection criteria include clamping voltage under surge, thermal resistance (RθJA = 120 °C/W), AEC-Q101 qualification status, SMA (DO-214AC) package compatibility, and unidirectional polarity marking for cathode identification.
Technical Context
The P4SMA400AHM3_B/I uses a glass-passivated silicon junction optimized for fast transient response (<1 ns) and low incremental surge resistance. Its unidirectional configuration enables DC-biased line protection with defined cathode polarity, and it meets J-STD-020 MSL Level 1 reflow requirements (260 °C peak).
Rated for 400 W peak pulse power at 10/1000 µs waveform (derated above 25 °C), it delivers 548 V maximum clamping voltage (VC) at IPPM and exhibits a +0.110 %/°C temperature coefficient of VBR - critical for stable overvoltage threshold behavior across automotive temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 400 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC operating margin. |
| VBR (Breakdown Voltage) | 380–420 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC (Clamping Voltage) | 548 V at IPPM - Peak voltage seen by protected circuit during 400 W surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 µs) - Energy-handling capacity for single surges; derates linearly above 25 °C per Fig. 2. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; governs thermal design margin. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm max length, 4.50 mm max width, and matte tin-plated leads. |
Pinout & Package
Package: SMA (DO-214AC), molded epoxy case meeting UL 94 V-0 flammability rating; cathode indicated by band on unidirectional devices; terminals are matte tin plated, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower-potential side of protected line. | Defines reference point for unidirectional clamping; must be tied to ground or return path in DC-coupled protection schemes. |
| Cathode | Current exit terminal in forward bias; marked with band; connected to higher-potential side of protected line. | Enables reverse-biased operation during overvoltage events; polarity must match PCB silkscreen to avoid misapplication. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-ground) without derating in standard layouts. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and body electronics where long-term reliability under thermal cycling is mandatory. |
| Glass-passivated junction | Ensures stable leakage current (<1 µA at VWM) and consistent VBR over 15-year field life in humid environments. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without prebaking; eliminates moisture-related popcorning risk. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a), improving system-level robustness. |
Applications
| Automotive Power Supply Rail Protection | Industrial Sensor Signal Line Clamping |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs against load dump and alternator transients per ISO 16750-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges >100 V within nanoseconds. Use Value: Limits peak rail voltage to ≤548 V during 400 W surges, preventing damage to MCU power inputs and CAN transceivers. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: TVS mounted at connector interface to absorb ESD (IEC 61000-4-2 ±8 kV contact) and inductive switching spikes. Use Value: Maintains signal integrity below 50 mV perturbation during 10/1000 µs transients due to sub-1 ns response and low capacitance. |
| Telecom DC Power Input Stage | Consumer Appliance Motor Drive Protection |
Use Scenario: Secondary-side surge suppression on 48 V PoE-powered network switches and base stations. IC Role / Device Role / Timing Role: Standoff-rated TVS on DC input prior to DC/DC converter, absorbing lightning-induced surges. Use Value: Withstands repetitive 400 W pulses at 0.01% duty cycle, enabling compliance with Telcordia GR-1089-CORE Zone 3 requirements. |
Use Scenario: Overvoltage protection on brushed DC motor driver outputs in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Unidirectional suppressor across motor terminals to quench inductive kickback during MOSFET turn-off. Use Value: Clamps flyback spikes to ≤548 V, preventing gate oxide rupture in half-bridge drivers and extending MOSFET lifetime. |
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), same SMA package, but rated for 400 W only up to 91 V; above 91 V, PPPM drops to 300 W. | Lacks AEC-Q101 qualification; suitable for commercial-grade telecom or industrial use, not automotive. | Select when cost sensitivity outweighs automotive qualification and full 400 W capability above 91 V is unnecessary. |
| 1.5SMC400AHE3_A | Higher package thermal mass (SMC/DO-214AB); RθJA ≈ 50 °C/W vs. 120 °C/W; same VWM/VBR/VC specs. | Better thermal performance allows sustained surge handling in high-ambient environments; larger footprint requires layout change. | Choose when board space permits and thermal derating at elevated ambient (>85 °C) is critical for reliability. |
Compared with SMAJ400A-E3/5A and 1.5SMC400AHE3_A, the P4SMA400AHM3_B/I uniquely combines AEC-Q101 qualification, full 400 W rating across its entire voltage range, and minimal footprint - making it optimal for space-constrained automotive modules requiring zero-rework validation.
Availability
P4SMA400AHM3_B/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom DC power inputs requiring stable component supply with guaranteed AEC-Q101 compliance and traceable halogen-free sourcing.
Supply support for P4SMA400AHM3_B/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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with global manufacturing and testing facilities focused on reliability and automotive-grade performance.
The P4SMA series targets high-reliability transient suppression in automotive, industrial, and telecom systems - engineered for robust surge handling, precise voltage thresholds, and seamless SMT integration in demanding environments.
FAQ
What is the clamping voltage of the P4SMA400AHM3_B/I at its rated peak pulse current?
The P4SMA400AHM3_B/I has a maximum clamping voltage (VC) of 548 V at its specified peak pulse current (IPPM) under a 10/1000 µs waveform. This value is measured at the device's rated 400 W peak pulse power level and defines the upper voltage limit imposed on protected circuits during transient events. The P4SMA400AHM3_B/I maintains this clamping performance across its operational temperature range and is validated per AEC-Q101 test conditions.
Is the P4SMA400AHM3_B/I suitable for automotive applications?
Yes, the P4SMA400AHM3_B/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's P4SMA datasheet (Rev. 09-Jan-2024). It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias, and ESD verification - making it appropriate for under-hood and cabin electronics such as body control modules and ADAS sensor power supplies. The P4SMA400AHM3_B/I also complies with J-STD-020 MSL Level 1 for lead-free assembly.
What does the "HM3" suffix indicate in P4SMA400AHM3_B/I?
The "HM3" suffix in P4SMA400AHM3_B/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. The "H" indicates AEC-Q101 compliance, "M" signifies halogen-free molding compound, and "3" confirms RoHS compliance per EU Directive 2011/65/EU. This distinguishes the P4SMA400AHM3_B/I from commercial-grade variants like E3 or M3, and aligns it with automotive supply chain material requirements.
How does the thermal resistance of the P4SMA400AHM3_B/I affect PCB layout?
The P4SMA400AHM3_B/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. To maintain safe junction temperatures during repetitive surges, PCB layout must provide adequate copper area and thermal vias - undersized pads will cause excessive temperature rise and premature failure. The P4SMA400AHM3_B/I datasheet specifies this pad size as the baseline for all ratings.
What is the polarity configuration of the P4SMA400AHM3_B/I?
The P4SMA400AHM3_B/I is a unidirectional TVS diode, with polarity indicated by a cathode band on the SMA (DO-214AC) package. In circuit operation, the cathode connects to the higher-potential side (e.g., power rail), and the anode connects to ground or return. This configuration enables reverse-biased clamping during overvoltage events while blocking normal forward current - a critical distinction from bidirectional variants like P4SMA400CA. Correct orientation is essential for the P4SMA400AHM3_B/I to function as intended.
P4SMA400AHM3_B/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:
- 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/I FAQ
1.How can I place an order for P4SMA400AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA400AHM3_B/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_B/I reliable?
The price and inventory of P4SMA400AHM3_B/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_B/I is usually 5 days.
3.What payment methods are accepted for P4SMA400AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA400AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA400AHM3_B/I?
P4SMA400AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA400AHM3_B/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_B/I?
For technical support, including P4SMA400AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA400AHM3_B/I requirements.
6.How does Aetrix verify that P4SMA400AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All P4SMA400AHM3_B/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_B/I meets industry standards.
7.What is the process for return or replacement of P4SMA400AHM3_B/I?
All P4SMA400AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA400AHM3_B/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_B/I part is unused and in its original packaging.
Return procedure for P4SMA400AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA400AHM3_B/I Tags
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