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Vishay General Semiconductor - Diodes Division P4SMA350AHM3_B/H
- Part No.:
- P4SMA350AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA350AHM3_B/H.pdf
- Description:
- TVS DIODE 300VWM 482VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,867
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Product details
Overview
P4SMA350AHM3_B/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, rated for 350 V standoff voltage (VWM), 482 V clamping voltage (VC) at 0.62 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform). It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients and lightning surges in industrial and automotive electronics.
For engineers reviewing the P4SMA350AHM3_B/H datasheet, P4SMA350AHM3_B/H pinout, P4SMA350AHM3_B/H application, or P4SMA350AHM3_B/H equivalent, this device is selected for high-voltage transient suppression where AEC-Q101 qualification, halogen-free RoHS compliance, and stable clamping performance above 300 V are required.
Technical Context
The P4SMA350AHM3_B/H operates as a unidirectional avalanche diode with glass-passivated junction, delivering fast response time (<1 ns) and low incremental surge resistance to limit transient overvoltage before damage occurs. Its breakdown voltage (VBR) is 333–368 V at 1 mA test current, ensuring precise triggering above system operating voltage.
Designed for surface-mount assembly on standard 0.2" × 0.2" copper pads, it meets MSL Level 1 per J-STD-020 (peak reflow 260 °C) and supports repetitive surge duty cycles up to 0.01%. Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), enabling reliable operation up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 300 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (Breakdown Voltage) | 333–368 V at 1 mA - Confirmed avalanche initiation range; ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 482 V at IPPM = 0.62 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case transient; critical for downstream component survivability. |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy-handling capability under standardized 10/1000 μs surge; derates above 25 °C ambient. |
| ID (Reverse Leakage) | 1.0 μA at VWM - Negligible standby current; avoids loading of high-impedance signal or bias networks. |
| TJ max | 150 °C - Maximum allowable junction temperature; supports operation in under-hood automotive and industrial enclosures. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock per AEC specification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward conduction | Connected to ground or low-side reference in unidirectional TVS configuration; enables clamping to GND during positive transients. |
| Cathode | Current exit terminal in forward conduction; marked with band | Connected to protected line (e.g., power rail or signal); conducts surge current to ground when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients common in motor drives and power supply input stages without degradation. |
| AEC-Q101 qualified & halogen-free | Meets automotive reliability standards and environmental compliance requirements for Tier-1 supplier BOMs. |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to moisture-induced parameter drift in harsh environments. |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT reflow profiles without preconditioning or special handling. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD or inductive kick), improving protection margin. |
Applications
| Industrial Motor Drives | Automotive Power Distribution Units |
|---|---|
|
Use Scenario: Suppresses inductive kickback from solenoid valves and relay coils in PLC I/O modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24 V DC supply rail and ground to clamp transients up to ±1 kV. Use Value: Prevents latch-up or gate oxide damage in downstream MOSFET drivers and microcontrollers. |
Use Scenario: Protects 12 V/24 V battery-fed ECUs from load dump and alternator ripple in engine control units. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across main power input to absorb ISO 7637-2 Pulse 5a surges. Use Value: Maintains system uptime by limiting bus voltage to <482 V during 35 V/100 ms load dump events. |
| Telecom Power Supply Inputs | Sensor Signal Line Protection |
|
Use Scenario: Shields AC/DC front-end rectifiers and PFC controllers from lightning-induced surges on AC mains input. IC Role / Device Role / Timing Role: High-VWM TVS mounted upstream of bridge rectifier to clamp differential-mode transients. Use Value: Enables compliance with IEC 61000-4-5 Level 4 (4 kV) without requiring additional MOV staging. |
Use Scenario: Guards analog outputs of pressure/temperature sensors exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS placed inline with 4–20 mA loop or CAN signal pair. Use Value: Limits induced voltage to <482 V while adding <0.5 pF parasitic capacitance-no signal integrity impact. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ350A-E3/5A | Same VWM (350 V), lower PPPM (400 W), non-AEC-Q101, RoHS-compliant but not halogen-free | Lacks automotive qualification; suitable for commercial/industrial use only | Select when AEC-Q101 is not required and cost optimization is prioritized. |
| SMCJ350A-HM3 | Higher PPPM (1500 W), same VWM, DO-214AB package (larger footprint), AEC-Q101 qualified | Requires PCB layout change due to larger SMC package; used where higher surge margin is needed | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 and board space allows SMC footprint. |
Compared with SMAJ350A-E3/5A, P4SMA350AHM3_B/H adds halogen-free construction and AEC-Q101 validation without sacrificing clamping performance; versus SMCJ350A-HM3, it trades surge capacity for compact SMA footprint and lower thermal mass-ideal for space-constrained automotive modules.
Availability
P4SMA350AHM3_B/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive power distribution units, and telecom power supply inputs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for P4SMA350AHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The P4SMA Series is designed for robust transient voltage suppression in automotive, industrial, and telecom systems where high-voltage standoff, fast response, and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of P4SMA350AHM3_B/H under a 10/1000 μs surge?
The clamping voltage (VC) of P4SMA350AHM3_B/H is 482 V at a peak pulse current (IPPM) of 0.62 A with a 10/1000 μs waveform. This value is measured per standard test conditions and defines the maximum voltage imposed on the protected circuit during transient events. The P4SMA350AHM3_B/H maintains this clamping performance across its specified operating temperature range and is validated per JEDEC and IEC surge test protocols.
Is P4SMA350AHM3_B/H qualified for automotive applications?
Yes, P4SMA350AHM3_B/H is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials. The "HM3" suffix denotes halogen-free construction and automotive qualification, making it suitable for use in engine control units, body electronics, and ADAS power domains. Its thermal and surge performance has been verified across -65 °C to +150 °C junction temperature range per AEC-Q101 stress test requirements.
What is the standoff voltage rating of P4SMA350AHM3_B/H?
The standoff voltage (VWM) of P4SMA350AHM3_B/H is 300 V, meaning it remains non-conductive up to this reverse voltage under normal operating conditions. This rating provides a safety margin below the 333–368 V breakdown voltage (VBR) and ensures minimal leakage (<1.0 μA) during steady-state operation. The P4SMA350AHM3_B/H is intended for unidirectional DC rail protection where system nominal voltage is ≤300 V.
Does P4SMA350AHM3_B/H have a defined polarity marking?
Yes, P4SMA350AHM3_B/H is a unidirectional TVS diode with cathode indicated by a visible band on the SMA (DO-214AC) package body. The banded end connects to the protected line (e.g., 24 V rail), while the unbanded end connects to ground. Correct orientation is essential-reverse installation prevents clamping action and may cause catastrophic failure during overvoltage events. The P4SMA350AHM3_B/H datasheet confirms polarity via mechanical outline and marking diagram on page 5.
What is the peak pulse power rating of P4SMA350AHM3_B/H?
The peak pulse power (PPPM) rating of P4SMA350AHM3_B/H is 400 W for a 10/1000 μs waveform at TA = 25 °C. Above 91 V VWM, the rating is derated to 300 W per Vishay's published derating curve (Fig. 2). This rating reflects single-pulse energy absorption capability and must be applied with appropriate thermal design-such as minimum 0.2" × 0.2" copper pads-to maintain reliability. The P4SMA350AHM3_B/H sustains this rating under repetitive surge conditions with ≤0.01 % duty cycle.
P4SMA350AHM3_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):
- 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/H FAQ
1.How can I place an order for P4SMA350AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA350AHM3_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 P4SMA350AHM3_B/H reliable?
The price and inventory of P4SMA350AHM3_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 P4SMA350AHM3_B/H is usually 5 days.
3.What payment methods are accepted for P4SMA350AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA350AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA350AHM3_B/H?
P4SMA350AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA350AHM3_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 P4SMA350AHM3_B/H?
For technical support, including P4SMA350AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA350AHM3_B/H requirements.
6.How does Aetrix verify that P4SMA350AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All P4SMA350AHM3_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 P4SMA350AHM3_B/H meets industry standards.
7.What is the process for return or replacement of P4SMA350AHM3_B/H?
All P4SMA350AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA350AHM3_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 P4SMA350AHM3_B/H part is unused and in its original packaging.
Return procedure for P4SMA350AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA350AHM3_B/H Tags
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