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Vishay General Semiconductor - Diodes Division P4SMA20A-M3/5A
- Part No.:
- P4SMA20A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA20A-M3/5A.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,422
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Product details
Overview
P4SMA20A-M3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features 20 V standoff voltage (VWM), 27.7 V maximum clamping voltage at 14.4 A peak pulse current, and 400 W peak pulse power capability with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the P4SMA20A-M3/5A datasheet, P4SMA20A-M3/5A pinout, P4SMA20A-M3/5A application, or P4SMA20A-M3/5A equivalent, key selection criteria include unidirectional polarity, 17.1 V minimum breakdown voltage at 1 mA test current, thermal resistance of 120 °C/W, and halogen-free RoHS-compliant construction per M3 suffix.
Technical Context
This TVS diode operates as a clamping device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold (19.0–21.0 V), limiting transient energy to downstream circuitry. Its glass-passivated junction ensures stable leakage performance and fast response time (<1 ns), while the SMA package supports automated placement and meets J-STD-020 MSL Level 1.
The device delivers 400 W peak pulse power under 10/1000 µs waveform at 25 °C, derating to 300 W above 91 V, with 1.0 µA max reverse leakage at 17.1 V and 150 °C maximum junction temperature. It is rated for 40 A non-repetitive forward surge current (8.3 ms half-sine) and complies with AEC-Q101 when ordered with HE3/HM3 suffixes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 17.1 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR (Breakdown Voltage) | 19.0–21.0 V at 1 mA - Voltage at which avalanche conduction initiates; ensures precise overvoltage triggering. |
| VC (Clamping Voltage) | 27.7 V at 14.4 A IPPM - Peak voltage seen by protected circuit during worst-case transient; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 µs) - Energy-handling capacity for standard lightning/surge waveforms; validates robustness against IEC 61000-4-5 surges. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance; informs PCB copper pad sizing (0.2" × 0.2") for thermal reliability. |
| ID (Reverse Leakage) | 1.0 µA at VWM - Low leakage preserves low-power system integrity and minimizes standby current loss. |
| TJ max. | 150 °C - Maximum junction temperature; enables operation in automotive under-hood and industrial ambient environments. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Cathode indicated by band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to lower-potential side (e.g., ground or return path); defines unidirectional conduction direction. |
| Cathode | Avalanche clamping node / Transient sink | Connected to protected line (e.g., 24 V rail or signal input); conducts surge current to ground during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Enables protection against high-energy transients like inductive switch-off spikes and lightning-induced surges without degradation. |
| Glass passivated chip junction | Ensures long-term stability of breakdown voltage and leakage current across temperature and humidity stress conditions. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture-related popcorning or delamination risks. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients, improving protection margin for sensitive logic inputs. |
| Halogen-free construction (M3 suffix) | Meets environmental compliance requirements for industrial and automotive end equipment without compromising electrical performance. |
Applications
| Industrial Motor Drive Control | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protection of gate drivers and microcontroller I/O pins from inductive kickback during MOSFET switching in 24 V motor control circuits. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between power rail and ground near power stage. Use Value: Limits transient voltage to ≤27.7 V during 14.4 A surge, preventing latch-up or oxide damage in 3.3 V/5 V logic interfaces. |
Use Scenario: Safeguarding LIN bus transceivers and sensor supply lines against load dump and jump-start transients in vehicle interior modules. IC Role / Device Role / Timing Role: Standoff-clamp protector on 12 V supply rail upstream of LDO regulators and CAN/LIN PHYs. Use Value: Withstands 400 W pulses while maintaining <1 µA leakage at 17.1 V, preserving battery drain budget in always-on systems. |
| Telecom Power Interface | Consumer Appliance Mainboard |
Use Scenario: Input-stage surge suppression on AC/DC adapter secondary-side 24 V outputs feeding PoE injectors or base station controllers. IC Role / Device Role / Timing Role: Primary transient shunt on DC output rail, coordinated with upstream MOVs and downstream ceramic capacitors. Use Value: Clamps 10/1000 µs surges to 27.7 V within nanoseconds, meeting IEC 61000-4-5 Level 3 immunity requirements. |
Use Scenario: Overvoltage protection for microcontroller reset lines and EEPROM programming pins in washing machine mainboards exposed to ESD and relay bounce. IC Role / Device Role / Timing Role: Localized TVS on low-current signal paths adjacent to connectors and switches. Use Value: Provides sub-30 V clamping with 1.0 µA leakage, ensuring reliable reset assertion and avoiding false triggers during normal operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A | Same VWM (17.1 V), identical SMA package, but 400 W rating applies only up to 80 V; no AEC-Q101 qualification in standard grade. | Not qualified for automotive use unless specified with automotive suffix; lower thermal robustness above 91 V. | Select SMAJ20A only for cost-sensitive commercial designs where AEC-Q101 and >91 V derating are not required. |
| 1.5SMC20A | Larger SMC (DO-214AB) package, higher RθJA (60 °C/W), same VWM and VC, but rated for 1500 W peak pulse power. | Requires larger PCB footprint and different pad layout; suited for higher-energy surge environments where space permits. | Choose 1.5SMC20A when system-level surge testing exceeds IEC 61000-4-5 Level 4 and board area allows SMC footprint. |
Compared with SMAJ20A and 1.5SMC20A, P4SMA20A-M3/5A offers halogen-free construction, verified MSL Level 1 compatibility, and tighter parametric consistency across production lots - making it preferred for high-volume industrial and automotive-qualified designs requiring traceable sourcing and long-term supply continuity.
Availability
P4SMA20A-M3/5A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body electronics, telecom power interfaces, and consumer appliance mainboards requiring stable component supply and halogen-free compliance.
Supply support for P4SMA20A-M3/5A 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 application-specific optimization.
The P4SMA Series targets cost-effective, high-volume transient suppression in space-constrained surface-mount applications - engineered for robustness in automotive, industrial, and telecom environments where consistent clamping and thermal stability are critical.
FAQ
What is the maximum clamping voltage of the P4SMA20A-M3/5A under standard surge conditions?
The P4SMA20A-M3/5A has a maximum clamping voltage (VC) of 27.7 V at 14.4 A peak pulse current with a 10/1000 µs waveform. This value is measured under standardized test conditions per JEDEC and ensures predictable voltage limiting during transient events. The P4SMA20A-M3/5A maintains this clamping performance across its full operating temperature range and is validated for repetitive surge duty cycles up to 0.01 %.
Does the P4SMA20A-M3/5A meet automotive qualification standards?
The P4SMA20A-M3/5A itself is not AEC-Q101 qualified; however, Vishay offers AEC-Q101 variants under the HM3 suffix with revision codes (e.g., P4SMA20AHM3_A). The M3 suffix indicates halogen-free RoHS compliance only. For automotive applications requiring qualification, engineers must specify the HM3_A variant - the P4SMA20A-M3/5A is intended for industrial and commercial use where AEC-Q101 is not mandated.
What is the thermal resistance and recommended PCB layout for optimal performance of the P4SMA20A-M3/5A?
The P4SMA20A-M3/5A 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 reliability under repetitive surge conditions, use minimum pad dimensions matching the DO-214AC outline, ensure solder mask defined pads, and avoid thermal isolation. The P4SMA20A-M3/5A achieves full power rating only with this layout - smaller pads increase junction temperature and reduce surge endurance.
How does the P4SMA20A-M3/5A differ from bidirectional TVS diodes like P4SMA20CA?
The P4SMA20A-M3/5A is unidirectional and functions as a polarity-sensitive clamp - conducting only in reverse bias above VBR, with forward conduction like a standard diode. In contrast, P4SMA20CA is bidirectional and symmetrical, clamping in both directions with no cathode marking. The P4SMA20A-M3/5A is selected for DC rails where polarity is fixed (e.g., +24 V to GND), offering tighter leakage control and optimized avalanche characteristics for single-quadrant protection.
What packaging format does the P4SMA20A-M3/5A ship in, and what is the reel quantity?
The P4SMA20A-M3/5A ships in 13-inch diameter plastic tape and reel packaging, with a standard base quantity of 7500 units per reel (ordering code suffix /5A). This format supports high-speed automated pick-and-place assembly and is compatible with industry-standard SMT feeders. The P4SMA20A-M3/5A reel uses embossed carrier tape per EIA-481-D and includes desiccant and humidity indicator per J-STD-033.
P4SMA20A-M3/5A 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):
- 17.1V
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 27.7V
- Current - Peak Pulse (10/1000µs):
- 14.4A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA20A-M3/5A FAQ
1.How can I place an order for P4SMA20A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA20A-M3/5A 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 P4SMA20A-M3/5A reliable?
The price and inventory of P4SMA20A-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA20A-M3/5A is usually 5 days.
3.What payment methods are accepted for P4SMA20A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA20A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA20A-M3/5A?
P4SMA20A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA20A-M3/5A 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 P4SMA20A-M3/5A?
For technical support, including P4SMA20A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA20A-M3/5A requirements.
6.How does Aetrix verify that P4SMA20A-M3/5A is sourced from the original manufacturer or authorized distributors?
All P4SMA20A-M3/5A 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 P4SMA20A-M3/5A meets industry standards.
7.What is the process for return or replacement of P4SMA20A-M3/5A?
All P4SMA20A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA20A-M3/5A, 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 P4SMA20A-M3/5A part is unused and in its original packaging.
Return procedure for P4SMA20A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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