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Taiwan Semiconductor Corporation P4SMA20A
- Part No.:
- P4SMA20A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA20A.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,687
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Product details
Overview
P4SMA20A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power (10/1000μs), 19.0–21.0V breakdown voltage at 1mA, and 27.7V maximum clamping voltage at 15A. It protects DC/DC converters and SMPS inputs against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the P4SMA20A datasheet, P4SMA20A pinout, P4SMA20A application, or P4SMA20A equivalent, key selection criteria include working stand-off voltage (17.1V), low leakage (<1μA at VWM), fast response (<1.0ps), junction temperature range (−55°C to +150°C), and UL 94V-0 molded compound compliance.
Technical Context
The P4SMA20A operates as a unidirectional avalanche diode with glass-passivated junction, optimized for clamping induced voltage spikes on power rails. Its 17.1V working stand-off voltage ensures reliable blocking during normal operation, while its 27.7V clamping voltage at 15A limits downstream stress under 400W transient conditions.
Designed per ANSI/IEEE C62.35, it meets automotive-grade surge immunity per ISO 7637-2 across all five defined pulses. The DO-214AC package supports automated placement and provides thermal dissipation suitable for continuous operation up to TJ = 150°C, with moisture sensitivity level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT | 19.0–21.0 V at 1 mA test current - defines minimum and maximum avalanche onset threshold for design margining |
| VWM | 17.1 V - maximum continuous reverse voltage before significant leakage; sets safe operating rail margin |
| VC @ IPPM | 27.7 V at 15.0 A (10/1000 μs) - peak clamped voltage seen by protected circuit during worst-case surge |
| IPPM | 15.0 A - maximum non-repetitive surge current the device can safely shunt without degradation |
| PPPM | 400 W - peak pulse power handling capability under standardized 10/1000 μs waveform |
| IR @ VWM | <1 μA - ultra-low reverse leakage ensures minimal standby power loss and signal integrity |
| TJ max | +150 °C - maximum junction temperature enabling use in high-ambient industrial and automotive environments |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability; weight ≈ 0.060 g; UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional configuration |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to protected line (e.g., 24V rail); conducts only during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable avalanche characteristics and long-term reliability under repeated surge stress |
| Response time <1.0 ps | Enables suppression of nanosecond-scale ESD and fast-rising transients before IC damage occurs |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validates suitability for automotive power-line protection without additional external filtering |
| Moisture sensitivity level 1 | Eliminates need for dry-packaging or baking prior to reflow, simplifying SMT manufacturing |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental compliance requirements for industrial and consumer end equipment |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Input stage protection against load dump and inductive switching transients in 24V industrial SMPS units. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between input rail and ground to clamp surges before they reach primary-side controller ICs. Use Value: Limits transient voltage to ≤27.7V, preventing latch-up or gate oxide damage in MOSFET drivers and PWM controllers. | Use Scenario: Protection of point-of-load (POL) converter inputs in programmable logic controller (PLC) backplanes. IC Role / Device Role / Timing Role: Standoff-rated clamping device absorbing coupled noise from adjacent motor drives or relay coils. Use Value: Maintains 17.1V working margin below nominal 24V rail while suppressing 400W pulses without derating at 85°C ambient. |
| Lighting Application | Adapters |
Use Scenario: Surge protection in LED driver front-end circuits exposed to mains-coupled transients in outdoor street lighting. IC Role / Device Role / Timing Role: Primary-level TVS on AC/DC rectified output bus to prevent overvoltage failure of constant-current ICs. Use Value: Withstands repetitive 15A surges per IEC 61000-4-5 Level 3 while maintaining <1μA leakage at 17.1V to avoid efficiency loss. | Use Scenario: Input-stage protection in universal-input wall adapters subjected to plug-in surges and line disturbances. IC Role / Device Role / Timing Role: Unidirectional clamping element across secondary-side output to safeguard USB-PD or legacy 5V/12V regulation circuitry. Use Value: Clamps to 27.7V within <1ps, ensuring downstream LDOs and microcontrollers remain within absolute maximum ratings during EN 61000-4-4 bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A (Bourns) | Same DO-214AA package; 20V VWM, 32.4V VC @ 12.3A; 600W rating | Higher clamping voltage (+4.7V) and larger package footprint; better suited for higher-energy surges | Select SMBJ20A when system-level testing requires >400W margin or board layout allows DO-214AA |
| 1.5SMC20A (ON Semiconductor) | DO-214AB package; 20V VWM, 32.4V VC @ 12.3A; 1500W rating | Larger thermal mass and higher surge capacity; not drop-in due to different pad layout and height | Choose 1.5SMC20A for high-reliability industrial systems requiring extended surge endurance beyond 400W |
Compared with P4SMA20A, SMBJ20A offers higher peak power but increases clamping voltage and board area, while 1.5SMC20A delivers 3.75× higher pulse rating at the cost of non-compatible packaging and layout redesign.
Availability
P4SMA20A is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply with full traceability and lifecycle management.
Supply support for P4SMA20A 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
Taiwan Semiconductor Company (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for industrial and automotive markets.
The P4SMA20A belongs to TSC's P4SMAx series of surface-mount TVS diodes, engineered specifically for robust, cost-effective transient protection in space-constrained DC power interfaces.
FAQ
What is the polarity configuration of the P4SMA20A?
The P4SMA20A is a unidirectional TVS diode, with cathode indicated by a band on the DO-214AC (SMA) package. It conducts only in reverse breakdown during overvoltage events and blocks forward current like a standard diode. This configuration makes P4SMA20A appropriate for DC rail protection where polarity is fixed and reverse conduction must be prevented during normal operation.
Does the P4SMA20A meet automotive surge standards?
Yes, the P4SMA20A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for 12V and 24V automotive electrical systems. Its 400W peak pulse power rating, 27.7V clamping voltage at 15A, and −55°C to +150°C operating range make P4SMA20A suitable for engine control unit (ECU) power inputs, body control modules, and infotainment power conditioning without additional external components.
What is the maximum clamping voltage of the P4SMA20A under surge conditions?
The maximum clamping voltage of the P4SMA20A is 27.7V at 15.0A peak pulse current using the standardized 10/1000μs waveform. This value is guaranteed across the full operating temperature range and represents the highest voltage the protected circuit will experience during a worst-case transient event. Engineers use this parameter to verify that downstream components in the P4SMA20A-protected rail remain within their absolute maximum voltage ratings.
Can the P4SMA20A be used in bidirectional configurations?
No - the P4SMA20A is unidirectional only. For bidirectional transient suppression, Taiwan Semiconductor specifies parts with "C" or "CA" suffixes (e.g., P4SMA20CA). Using P4SMA20A in reverse-biased AC applications risks forward conduction and failure. Always confirm polarity alignment in schematic capture and PCB layout to ensure the cathode band connects to the line being protected.
What is the leakage current specification for the P4SMA20A at its working voltage?
The P4SMA20A exhibits a maximum reverse leakage current of less than 1μA at its working stand-off voltage (VWM) of 17.1V and 25°C ambient. This ultra-low leakage minimizes quiescent power loss and avoids interference with high-impedance sensing nodes or battery-powered circuits. At elevated temperatures, leakage remains well below 10μA up to 125°C, preserving efficiency in thermally demanding P4SMA20A deployments.
P4SMA20A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- P4SMA
- 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):
- 15A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA20A FAQ
1.How can I place an order for P4SMA20A through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA20A 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 reliable?
The price and inventory of P4SMA20A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA20A is usually 5 days.
3.What payment methods are accepted for P4SMA20A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA20A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA20A?
P4SMA20A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA20A 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?
For technical support, including P4SMA20A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA20A requirements.
6.How does Aetrix verify that P4SMA20A is sourced from the original manufacturer or authorized distributors?
All P4SMA20A 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 meets industry standards.
7.What is the process for return or replacement of P4SMA20A?
All P4SMA20A units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA20A, 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 part is unused and in its original packaging.
Return procedure for P4SMA20A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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