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Vishay General Semiconductor - Diodes Division P4SMA300AHM3_B/H
- Part No.:
- P4SMA300AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA300AHM3_B/H.pdf
- Description:
- TVS DIODE 256VWM 414VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,754
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Product details
Overview
P4SMA300AHM3_B/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the P4SMA series, designed for high-voltage surge protection in power rails and signal lines. It features a 300 V standoff voltage (VWM), 315 V minimum breakdown voltage (VBR), 400 W peak pulse power (10/1000 µs), clamping voltage of 414 V at 0.73 A peak pulse current, and operates across -65 °C to +150 °C junction temperature range.
For engineers reviewing the P4SMA300AHM3_B/H datasheet, P4SMA300AHM3_B/H pinout, P4SMA300AHM3_B/H application, or P4SMA300AHM3_B/H equivalent, this device serves as an AEC-Q101-qualified, halogen-free, RoHS-compliant TVS for automotive power supply rail protection where high-voltage transients-such as load dump or ISO 7637-2 pulses-must be safely clamped without sacrificing response time or reliability.
Technical Context
The P4SMA300AHM3_B/H employs a glass-passivated silicon junction optimized for fast transient response (<1 ns typical) and low incremental surge resistance, enabling effective suppression of high-energy surges while maintaining stable clamping performance under repetitive stress. Its unidirectional polarity and cathode-band marking align with standard PCB layout conventions for DC-biased protection paths.
Rated for 400 W peak pulse power (10/1000 µs waveform) and derated above 25 °C per Fig. 2, it delivers 300 W clamping capability above 91 V, with thermal resistance of 120 °C/W (junction-to-ambient) on recommended 0.2" × 0.2" copper pads. It meets J-STD-020 MSL Level 1 and JESD 201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 300 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC bias margin for protected line. |
| VBR (Breakdown Voltage) | 285–315 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 414 V at IPPM = 0.73 A - Peak voltage seen by downstream circuitry during full-rated surge; critical for IC survivability. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 µs) - Energy-handling capacity for standardized surge waveforms; supports automotive load-dump immunity. |
| IFSM (Surge Current) | 40 A (8.3 ms half-sine) - Forward surge rating confirms robustness against inrush or fault currents in DC power paths. |
| TJmax | +150 °C - Enables operation in under-hood automotive environments and industrial power enclosures without derating. |
| Package | SMA (DO-214AC) - Standardized SMD footprint with 5.0 mm × 5.0 mm thermal pad area; compatible with automated reflow assembly. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to lower-potential side of protected line | Enables unidirectional clamping from cathode to ground or reference rail; must be routed to system GND or return path. |
| Cathode | Current exit point in forward bias; marked with band; connected to higher-potential side | Acts as the protected node input; placed directly at IC power pin or connector entry to minimize inductance and ensure fast clamping. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing-required for engine control, ADAS, and body electronics. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets global environmental compliance mandates without compromising thermal or electrical performance; no brominated flame retardants. |
| 400 W peak pulse power (10/1000 µs) | Supports ISO 7637-2 Pulse 5a (load dump) up to 35 V superimposed on 14 V nominal systems, with margin for aging and tolerance stack-up. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., inductive switch-off), improving protection fidelity for sensitive gate drivers and microcontrollers. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow without moisture-related delamination; eliminates pre-bake requirement in high-volume SMT lines. |
Applications
| Automotive Power Rail Protection | Industrial DC Power Input Stage |
|---|---|
|
Use Scenario: Protecting 24 V/36 V battery-fed ECUs from load dump transients exceeding 60 V during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and primary DC/DC converter input to clamp surges before they reach switching controller. Use Value: Clamps to 414 V at 0.73 A, limiting stress on downstream MOSFETs and controllers rated for ≤450 V absolute maximum, extending field lifetime. |
Use Scenario: Safeguarding programmable logic controllers (PLCs) powered from 24 V industrial supplies exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main 24 V input, positioned upstream of EMI filter and bulk capacitor to absorb energy before filtering stages saturate. Use Value: 400 W rating handles repetitive 10/1000 µs surges common in factory automation, reducing need for secondary crowbar circuits or redundant TVS staging. |
| Telecom Line Interface Protection | High-Voltage Sensor Signal Conditioning |
|
Use Scenario: Shielding RS-485 transceivers and PoE-powered devices from lightning-induced surges on long cable runs in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Secondary-level TVS on DC bias rail feeding isolated data interface ICs, coordinated with primary gas discharge tube (GDT) stage. Use Value: Fast <1 ns response complements slower GDTs, ensuring low let-through voltage during initial surge rise time-critical for isolator survival. |
Use Scenario: Protecting analog front-ends of current/voltage sensors measuring 300 V AC mains or HV battery strings in energy storage systems. IC Role / Device Role / Timing Role: Standoff-rated TVS on sensor output line or supply rail to prevent latch-up or die damage from coupling through isolation barriers. Use Value: 300 V VWM allows direct placement on 277 V AC-derived DC rails without leakage concerns, eliminating need for voltage divider bias networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ300A-E3/5A | Same SMA package, 300 V VWM, but rated for 400 W only up to 200 V; 300 V version has reduced PPPM (300 W) and higher VC (440 V). | Lacks AEC-Q101 qualification and halogen-free certification; suitable for commercial, not automotive, use. | Select when cost sensitivity outweighs automotive qualification and environmental compliance requirements. |
| 1.5SMC300AHE3_A | Higher-power SMC package (1500 W), same 300 V VWM, but larger footprint (7.11 mm × 6.22 mm) and 10× higher IPPM (3.3 A). | Used where board space permits and surge energy exceeds 400 W-e.g., main distribution panels or EV charging interfaces. | Choose when system-level surge testing requires >400 W headroom or when thermal dissipation demands larger copper area. |
Compared with SMAJ300A-E3/5A and 1.5SMC300AHE3_A, the P4SMA300AHM3_B/H uniquely combines AEC-Q101 qualification, halogen-free construction, and compact SMA footprint at 400 W rating-making it the optimal choice for space-constrained, automotive-grade 300 V rail protection where regulatory compliance and long-term reliability are non-negotiable.
Availability
P4SMA300AHM3_B/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC power inputs, telecom line interface protection, and high-voltage sensor conditioning requiring stable component supply across extended production lifecycles.
Supply support for P4SMA300AHM3_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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The P4SMA series was engineered specifically for surface-mount transient suppression in harsh environments, emphasizing AEC-Q101 compliance, thermal robustness, and consistent clamping performance across wide temperature ranges.
FAQ
What is the clamping voltage of the P4SMA300AHM3_B/H, and how does it protect downstream components?
The P4SMA300AHM3_B/H has a maximum clamping voltage (VC) of 414 V at 0.73 A peak pulse current (10/1000 µs). This value represents the highest voltage imposed on the protected circuit during a full-rated surge event. By limiting transient overvoltage to this level, the P4SMA300AHM3_B/H prevents breakdown or latch-up in downstream ICs, MOSFETs, and regulators rated for ≤450 V absolute maximum, preserving functional integrity and long-term reliability in automotive and industrial applications.
Is the P4SMA300AHM3_B/H suitable for automotive applications, and what qualifications does it hold?
Yes, the P4SMA300AHM3_B/H is explicitly qualified to AEC-Q101 standards for automotive use, as confirmed by its HM3 suffix and documentation in Vishay's P4SMA Series datasheet (Rev. 09-Jan-2024). It also meets J-STD-020 MSL Level 1 and JESD 201 Class 2 whisker resistance requirements-making the P4SMA300AHM3_B/H appropriate for under-hood ECUs, ADAS modules, and body control units where vibration, thermal cycling, and long service life are critical.
How does the P4SMA300AHM3_B/H differ from bidirectional TVS diodes like P4SMA300CA?
The P4SMA300AHM3_B/H is unidirectional and intended for DC-biased protection paths-its cathode must be connected toward the higher-potential side (e.g., battery rail), with anode tied to ground or return. In contrast, P4SMA300CA is bidirectional and symmetrical, used for AC-coupled or floating signal lines. The P4SMA300AHM3_B/H offers tighter VBR tolerance (285–315 V) and lower leakage at VWM than its bidirectional counterpart, making it more precise for regulated DC rail protection.
What is the thermal resistance and recommended PCB layout for optimal performance of the P4SMA300AHM3_B/H?
The P4SMA300AHM3_B/H 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. To achieve rated 400 W pulse power, designers must implement these minimum pad areas and avoid excessive trace length or narrow traces between the P4SMA300AHM3_B/H and ground/power planes-ensuring low-inductance, low-resistance thermal and current paths.
Does the P4SMA300AHM3_B/H require additional series impedance for effective surge protection?
No, the P4SMA300AHM3_B/H functions as a shunt protector and does not require series impedance to operate-but adding a small series resistor (e.g., 1–10 Ω) or ferrite bead upstream can reduce peak current demand on the P4SMA300AHM3_B/H during very fast transients, extending its usable lifetime under repetitive stress. Such external components are application-dependent and should be validated per IEC 61000-4-5 or ISO 7637-2 test profiles for the specific P4SMA300AHM3_B/H implementation.
P4SMA300AHM3_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):
- 256V
- Voltage - Breakdown (Min):
- 285V
- Voltage - Clamping (Max) @ Ipp:
- 414V
- Current - Peak Pulse (10/1000µs):
- 730mA
- 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)
P4SMA300AHM3_B/H FAQ
1.How can I place an order for P4SMA300AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA300AHM3_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 P4SMA300AHM3_B/H reliable?
The price and inventory of P4SMA300AHM3_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 P4SMA300AHM3_B/H is usually 5 days.
3.What payment methods are accepted for P4SMA300AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA300AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA300AHM3_B/H?
P4SMA300AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA300AHM3_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 P4SMA300AHM3_B/H?
For technical support, including P4SMA300AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA300AHM3_B/H requirements.
6.How does Aetrix verify that P4SMA300AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All P4SMA300AHM3_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 P4SMA300AHM3_B/H meets industry standards.
7.What is the process for return or replacement of P4SMA300AHM3_B/H?
All P4SMA300AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA300AHM3_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 P4SMA300AHM3_B/H part is unused and in its original packaging.
Return procedure for P4SMA300AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA300AHM3_B/H Tags
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