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Vishay General Semiconductor - Diodes Division P4SMA350AHM3_B/I
- Part No.:
- P4SMA350AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA350AHM3_B/I.pdf
- Description:
- TVS DIODE 300VWM 482VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,272
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Product details
Overview
P4SMA350AHM3_B/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for high-voltage transient protection in power rails and signal lines. It features a 350 V standoff voltage (VWM), 368 V minimum breakdown voltage (VBR), 482 V maximum clamping voltage (VC) at 0.62 A peak pulse current (IPPM), and 400 W peak pulse power (PPPM) with 10/1000 µs waveform - suitable for automotive-grade surge protection in DC power supplies and industrial sensor interfaces.
For engineers reviewing the P4SMA350AHM3_B/I datasheet, P4SMA350AHM3_B/I pinout, P4SMA350AHM3_B/I application, or P4SMA350AHM3_B/I equivalent, key selection criteria include its AEC-Q101 qualification, SMA (DO-214AC) package compatibility, unidirectional polarity with cathode band marking, and thermal resistance (RθJA = 120 °C/W) for board-level thermal design validation.
Technical Context
This TVS diode operates as a clamping device that remains non-conductive below its 350 V stand-off voltage and rapidly transitions to low-impedance conduction above 368 V breakdown, limiting transient energy to ≤482 V at rated 0.62 A pulse. Its glass-passivated junction ensures stable leakage (<1 µA at VWM) and fast response time (<1.0 ns).
The device is rated for 150 °C maximum junction temperature, supports 40 A non-repetitive forward surge current (IFSM), and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its halogen-free, RoHS-compliant construction and AEC-Q101 qualification confirm suitability for automotive under-hood and industrial control applications requiring long-term reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 350 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC operating margin. |
| VBR (Breakdown Voltage) | 333–368 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC (Clamping Voltage) | 482 V at IPPM = 0.62 A - Peak voltage seen by protected circuit during 10/1000 µs surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 400 W - Sustained transient energy handling capability under standard 10/1000 µs waveform; derates above 25 °C ambient. |
| ID (Reverse Leakage) | <1 µA at 350 V - Minimal standby power loss and signal integrity impact in high-impedance circuits. |
| TJ max. | 150 °C - Enables operation in under-hood automotive environments and industrial enclosures without active cooling. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs PCB copper area requirements. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads. Cathode identified by a single band at one end; anode is unmarked.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when voltage exceeds VBR. |
| Anode (unmarked end) | Reference / return path | Typically tied to system ground or lower-potential rail; completes clamping path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics with extended temperature and life-cycle testing. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for global industrial and automotive supply chains without compromising surge robustness. |
| 400 W peak pulse power (10/1000 µs) | Protects against IEC 61000-4-5 Level 4 surges (4 kV line-to-ground) in 12 V/24 V/48 V DC systems with minimal PCB footprint. |
| Low incremental surge resistance | Ensures tight clamping voltage window (VC − VBR ≈ 114 V), minimizing voltage overshoot during fast-rising transients. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile (260 °C peak), eliminating bake-out requirements in SMT assembly. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Guarding |
|---|---|
Use Scenario: Protecting 24 V battery-fed ECUs from load-dump transients up to 60 V and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp surges before they reach LDOs or microcontrollers. Use Value: Withstands 400 W pulses and maintains <1 µA leakage at 350 V, enabling reliable operation across −40 °C to +125 °C ambient. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors in factory automation PLC modules from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Low-capacitance clamping element on 0–10 V or 4–20 mA output lines to preserve signal fidelity during field wiring events. Use Value: 482 V clamping voltage prevents damage to precision op-amps while its DO-214AC package fits high-density sensor interface layouts. |
| Telecom DC Power Input Stage | Renewable Energy Inverter Control Board |
Use Scenario: Safeguarding 48 V telecom rectifier outputs against lightning-induced surges on outdoor cabinet power feeds. IC Role / Device Role / Timing Role: Primary overvoltage suppression stage upstream of DC-DC converters and monitoring ICs. Use Value: AEC-Q101 qualification and 150 °C TJ rating ensure longevity in sealed, passively cooled enclosures exposed to wide ambient swings. |
Use Scenario: Protecting gate drivers and isolated feedback circuits in solar string inverters from grid-switching transients and ground potential differences. IC Role / Device Role / Timing Role: High-VWM TVS on auxiliary 15 V bias rails to prevent latch-up or destruction of optocouplers and level-shifters. Use Value: 350 V VWM provides sufficient margin above nominal 24 V bias while delivering 482 V clamping to keep downstream logic within safe SOA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ350A-E3/5A | Same VWM/VBR/VC specs; commercial-grade (non-AEC-Q101); RoHS-compliant but not halogen-free. | Lacks automotive qualification; suitable for industrial/commercial power supplies where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive qualification and halogen-free requirements. |
| 1.5SMC350AHE3_A | Higher PPPM (1500 W), larger SMC (DO-214AB) package; same VWM/VBR/VC; AEC-Q101 and halogen-free. | Requires more PCB area; better suited for higher-energy surge environments (e.g., traction battery interfaces). | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 and board space permits larger footprint. |
Compared with P4SMA350AHM3_B/I, SMAJ350A-E3/5A offers identical electrical protection but lacks automotive qualification and halogen-free status, while 1.5SMC350AHE3_A delivers triple the pulse power in a larger package - making P4SMA350AHM3_B/I optimal for space-constrained AEC-Q101 designs needing balanced surge robustness and footprint efficiency.
Availability
P4SMA350AHM3_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, long-term lifecycle support, and AEC-Q101-compliant surge protection.
Supply support for P4SMA350AHM3_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 is a global leader in discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The P4SMA Series targets high-voltage transient suppression in automotive, industrial, and telecom systems, with design focus on AEC-Q101 qualification, low-profile packaging, and consistent clamping behavior across temperature and lifetime.
FAQ
What is the clamping voltage of the P4SMA350AHM3_B/I under a 10/1000 µs surge?
The P4SMA350AHM3_B/I has a maximum clamping voltage (VC) of 482 V at 0.62 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per Figure 1 in the Vishay datasheet (Doc. #88367, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during transient events. The P4SMA350AHM3_B/I maintains this clamping performance across its full operating temperature range.
Is the P4SMA350AHM3_B/I AEC-Q101 qualified and what does that mean for automotive use?
Yes, the P4SMA350AHM3_B/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's P4SMA series datasheet. This qualification means the device has passed accelerated stress tests for temperature cycling, humidity, mechanical shock, and high-temperature operating life - validating its reliability in automotive under-hood and cabin environments. The P4SMA350AHM3_B/I is approved for use in engine control modules, body controllers, and ADAS power supplies where failure could impact vehicle safety or function.
What is the package type and mounting configuration of the P4SMA350AHM3_B/I?
The P4SMA350AHM3_B/I uses the SMA (DO-214AC) surface-mount package: a low-profile, two-terminal plastic case with matte tin-plated leads. It is mounted using standard reflow soldering with MSL Level 1 handling (no bake required), and polarity is indicated by a cathode band at one end. The P4SMA350AHM3_B/I requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated thermal and power performance, per Vishay's recommended layout in Document #88367.
How does the P4SMA350AHM3_B/I compare to bidirectional TVS diodes in surge protection applications?
The P4SMA350AHM3_B/I is unidirectional and intended for DC power line protection where polarity is fixed - it conducts only during reverse overvoltage (cathode positive), offering tighter leakage and slightly lower clamping than equivalent bidirectional devices. Bidirectional variants (e.g., P4SMA350CA) protect AC or floating lines but exhibit higher ID at VWM. For 24 V/48 V automotive rails, the P4SMA350AHM3_B/I delivers superior DC blocking and lower standby loss, making it the preferred choice unless AC-coupled or polarity-agnostic protection is required.
What is the maximum junction temperature and thermal resistance of the P4SMA350AHM3_B/I?
The P4SMA350AHM3_B/I has a maximum junction temperature (TJ max.) of +150 °C and a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads. These values are specified in the "Thermal Characteristics" section of Vishay's P4SMA datasheet (Doc. #88367). The P4SMA350AHM3_B/I can sustain continuous power dissipation up to 3.3 W at 50 °C ambient, and its thermal performance supports operation in sealed enclosures without forced airflow - critical for automotive and industrial deployments.
P4SMA350AHM3_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):
- 300V
- Voltage - Breakdown (Min):
- 333V
- Voltage - Clamping (Max) @ Ipp:
- 482V
- Current - Peak Pulse (10/1000µs):
- 620mA
- 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)
P4SMA350AHM3_B/I FAQ
1.How can I place an order for P4SMA350AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA350AHM3_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 P4SMA350AHM3_B/I reliable?
The price and inventory of P4SMA350AHM3_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 P4SMA350AHM3_B/I is usually 5 days.
3.What payment methods are accepted for P4SMA350AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA350AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA350AHM3_B/I?
P4SMA350AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA350AHM3_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 P4SMA350AHM3_B/I?
For technical support, including P4SMA350AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA350AHM3_B/I requirements.
6.How does Aetrix verify that P4SMA350AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All P4SMA350AHM3_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 P4SMA350AHM3_B/I meets industry standards.
7.What is the process for return or replacement of P4SMA350AHM3_B/I?
All P4SMA350AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA350AHM3_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 P4SMA350AHM3_B/I part is unused and in its original packaging.
Return procedure for P4SMA350AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA350AHM3_B/I Tags
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