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Taiwan Semiconductor Corporation P4SMA20
- Part No.:
- P4SMA20
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA20.pdf
- Description:
- 400W, 20V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:4,557
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Product details
Overview
P4SMA20 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power, 18.0–22.0V breakdown voltage (VBR), and 29.1V clamping voltage (VC) at 14.0A peak impulse current - designed to protect DC/DC converters and SMPS inputs against ESD and surge transients per ISO 7637-2.
For engineers reviewing the P4SMA20 datasheet, P4SMA20 pinout, P4SMA20 application, or P4SMA20 equivalent, key selection criteria include its 16.2V working stand-off voltage (VWM), <1μA reverse leakage at VWM, fast sub-1ps response time, and compliance with JESD201 Class 2 whisker resistance and UL 94V-0 flammability standards.
Technical Context
The P4SMA20 employs a glass-passivated silicon junction optimized for unidirectional transient suppression, with clamping behavior defined by the 10/1000μs double-exponential surge waveform per IEC 61000-4-5 and ISO 7637-2 Pulse 1/2a/2b/3a/3b. Its thermal design supports continuous operation from –55°C to +150°C junction temperature.
It features a single-die configuration in DO-214AC package with cathode band polarity marking, matte tin-plated leads compliant with J-STD-002 solderability, and moisture sensitivity level (MSL) 1 - enabling reflow compatibility without dry-pack requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 16.2 V - maximum continuous reverse operating voltage before significant leakage begins |
| VBR min/max | 18.0–22.0 V @ 1.0 mA - guaranteed breakdown threshold range for reliable turn-on during overvoltage events |
| VC | 29.1 V @ 14.0 A - clamped voltage seen by protected circuit under full-rated 400W transient |
| IPPM | 14.0 A - peak impulse current supported by the device under 10/1000μs waveform |
| PPPM | 400 W - peak pulse power handling capability, derated linearly above 25°C ambient |
| IR @ VWM | <1 μA - ultra-low leakage ensures minimal standby power loss in high-impedance circuits |
| TJ max | +150 °C - maximum junction temperature enabling use in thermally constrained PCB layouts |
Pinout & Package
DO-214AC (SMA) surface-mount package: molded epoxy case with cathode band marking; dimensions per JEDEC DO-214AC standard; weight ≈ 0.060 g; RoHS and halogen-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional TVS configuration |
| Cathode (marked) | Reverse-biased clamping terminal | Connected to protected line (e.g., VIN); conducts when line exceeds VBR to shunt surge to ground |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress |
| Sub-1 ps response time | Enables effective suppression of fast-rising ESD events before downstream ICs are damaged |
| ISO 7637-2 compliance | Validated for automotive load-dump and switching transient immunity in 12V/24V systems |
| MSL Level 1 rating | Permits standard reflow assembly without baking or special handling |
| UL 94V-0 molding compound | Meets flame-retardancy requirements for industrial and transportation end equipment |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Input stage protection against line surges and back-EMF from upstream converters. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and ground to clamp transients before they reach PWM controller or MOSFET gate drivers. Use Value: Limits voltage excursion to ≤29.1V during 400W surges, preserving integrity of 30V-rated input capacitors and controllers. | Use Scenario: Protection of point-of-load (POL) converter inputs in embedded computing modules. IC Role / Device Role / Timing Role: Standoff-rated TVS on 5V/12V/24V input rails to absorb coupling noise from adjacent digital switching sections. Use Value: 16.2V VWM allows safe operation across nominal rail tolerances while clamping fast spikes below IC absolute maximum ratings. |
| Lighting Application | Automotive Adapter |
Use Scenario: Surge protection in LED driver front-end exposed to mains-coupled transients or hot-swap events. IC Role / Device Role / Timing Role: Primary-level TVS on AC/DC rectified output or constant-current regulator input. Use Value: Sub-1μA leakage avoids loading precision current sense paths; 150°C TJ rating supports sealed, thermally isolated lamp housings. | Use Scenario: Input protection in 12V vehicle-to-USB adapters subject to load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional clamping device on battery-input side, referenced to chassis ground. Use Value: ISO 7637-2 Pulse 5a (load dump) compliance ensures survival of 35V/200ms transients without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A | 600W rating, 20V nominal VBR, DO-214AA (SMB) package - larger footprint, higher IPPM (32.4A) | Better suited for higher-energy surges; requires PCB layout change due to larger body and lead spacing | Select SMBJ20A when system-level testing demands >400W surge margin or longer-duration transients |
| 1.5SMC20A | 1500W rating, 20V nominal VBR, DO-214AB (SMC) package - significantly larger, higher thermal mass | Used in industrial motor drives or telecom power where multi-kA lightning-induced surges occur | Choose 1.5SMC20A only if P4SMA20 fails IEC 61000-4-5 Level 4 testing and board space permits SMC footprint |
Compared with SMBJ20A and 1.5SMC20A, the P4SMA20 provides optimal balance of compact DO-214AC footprint, 400W surge capability, and low-leakage performance for space-constrained consumer and automotive adapter designs - without requiring PCB redesign or sacrificing reliability.
Availability
P4SMA20 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 consistent parametric performance and traceable lot history.
Supply support for P4SMA20 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 Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and protection devices since 1979.
The P4SMA20 belongs to TSC's P4SMAx series of surface-mount TVS diodes engineered specifically for cost-sensitive, high-volume industrial and automotive power-supply protection - emphasizing MSL-1 process compatibility, ISO 7637-2 validation, and tight VBR tolerances.
FAQ
What is the maximum clamping voltage of the P4SMA20 under rated surge conditions?
The P4SMA20 exhibits a maximum clamping voltage (VC) of 29.1 V when subjected to its rated 14.0 A peak impulse current (IPPM) using the 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on the protected circuit during a full 400W transient event. The P4SMA20 maintains this clamping performance across its specified operating temperature range.
Is the P4SMA20 suitable for bidirectional transient suppression?
No - the P4SMA20 is a unidirectional TVS diode intended for DC line protection with defined anode/cathode polarity. For bidirectional applications such as AC lines or data bus protection, TSC specifies the P4SMA20A variant (with 'A' suffix), which features symmetrical breakdown in both directions. Using the P4SMA20 in reverse-biased configurations outside its rated VWM may result in premature failure.
What is the reverse leakage current specification for the P4SMA20 at its working stand-off voltage?
The P4SMA20 guarantees a maximum reverse leakage current (IR) of less than 1 μA when biased at its rated working stand-off voltage (VWM) of 16.2 V, measured at 25°C. This ultra-low leakage minimizes quiescent power loss and avoids interference with high-impedance sensing or reference circuits commonly found in precision power management subsystems utilizing the P4SMA20.
Does the P4SMA20 meet automotive surge immunity standards?
Yes - the P4SMA20 is explicitly validated to meet ISO 7637-2 test pulses 1, 2a, 2b, 3a, and 3b, covering common automotive electrical disturbances including supply transients, load dump, and coupled noise. Its 150°C maximum junction temperature and MSL Level 1 rating further support deployment in engine control units, infotainment power rails, and body electronics where the P4SMA20 serves as primary front-end protection.
What package type and mounting method does the P4SMA20 use?
The P4SMA20 uses the DO-214AC (SMA) surface-mount package - a standardized, compact plastic case with coplanar matte tin-plated leads compliant with J-STD-002 solderability requirements. It is designed for automated placement and reflow soldering, with polarity indicated by a cathode band; no through-hole or socket mounting is supported. The P4SMA20's 0.060 g mass and UL 94V-0 compound align with IPC-A-610 Class 2/3 assembly standards.
P4SMA20 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):
- 16.2V
- Voltage - Breakdown (Min):
- 18V
- Voltage - Clamping (Max) @ Ipp:
- 29.1V
- Current - Peak Pulse (10/1000µs):
- 14A
- 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)
P4SMA20 FAQ
1.How can I place an order for P4SMA20 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA20 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 P4SMA20 reliable?
The price and inventory of P4SMA20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA20 is usually 5 days.
3.What payment methods are accepted for P4SMA20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA20?
P4SMA20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA20 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 P4SMA20?
For technical support, including P4SMA20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA20 requirements.
6.How does Aetrix verify that P4SMA20 is sourced from the original manufacturer or authorized distributors?
All P4SMA20 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 P4SMA20 meets industry standards.
7.What is the process for return or replacement of P4SMA20?
All P4SMA20 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA20, 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 P4SMA20 part is unused and in its original packaging.
Return procedure for P4SMA20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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