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Taiwan Semiconductor Corporation P4SMA20H
- Part No.:
- P4SMA20H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA20H.pdf
- Description:
- 400W, 20V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:8,039
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Product details
Overview
P4SMA20H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 20V nominal breakdown voltage (18.0–22.0V), 16.2V working stand-off voltage, 29.1V clamping voltage at 14A peak pulse current, 400W peak pulse power rating (10/1000μs), and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the P4SMA20H datasheet, P4SMA20H pinout, P4SMA20H application, or P4SMA20H equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b transients, low leakage (<1μA at 16.2V), DO-214AC (SMA) package compatibility with automated SMT assembly, and junction temperature range of –55°C to +150°C.
Technical Context
The P4SMA20H operates as a unidirectional avalanche diode, leveraging glass-passivated silicon junction technology to achieve sub-1ps response time and stable clamping during fast-rising transients. Its electrical behavior follows IEEE C62.35 standards, with breakdown voltage specified at 1mA test current and clamping defined per 10/1000μs waveform.
It is rated for 40A non-repetitive forward surge current (8.3ms half-sine), supports ≤3.5V forward voltage at 25A, and maintains thermal stability via a 150°C maximum junction temperature. Moisture sensitivity is Level 1 (J-STD-020), and terminals are matte tin-plated for J-STD-002 solderability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 18.0 V / 22.0 V - Ensures reliable avalanche conduction onset within tight tolerance across production lots |
| VWM | 16.2 V - Maximum continuous reverse voltage before significant leakage; sets safe operating margin below VBR |
| VC@IPPM | 29.1 V at 14.0 A - Clamped voltage during 400W transient; defines worst-case voltage seen by protected circuitry |
| IR@VWM | <1 μA - Ultra-low leakage preserves efficiency in high-impedance or battery-backed circuits |
| PPPM | 400 W (10/1000μs) - Peak power handling capability against standardized automotive load-dump and inductive-switching surges |
| TJ max | +150 °C - Enables operation in under-hood or enclosed industrial environments without derating |
| Package | DO-214AC (SMA) - Industry-standard SMT footprint compatible with JEDEC MS-013; 0.060g mass aids thermal management |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking for polarity identification. Matte tin-plated leads meet J-STD-002 solderability requirements; molding compound complies with UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Transient return path | Connected to lower-potential side (e.g., GND or return rail); conducts during reverse-transient clamping |
| Cathode | Protected line connection / Surge input | Connected to line being protected (e.g., 24V rail); avalanche conduction occurs when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and ADAS power supplies |
| Glass passivated junction | Enhances long-term reliability and moisture resistance vs. epoxy-passivated alternatives |
| Clamping response <1.0 ps | Protects sensitive downstream ICs (e.g., CAN transceivers, microcontrollers) from nanosecond-scale ESD/EFT events |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally compliant manufacturing |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Protection of primary-side MOSFET gate drivers and secondary-side rectifier outputs against switching spikes and cross-talk. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input/output rails to clamp transient overshoot before it reaches PWM controllers or synchronous rectifiers. Use Value: Limits voltage excursions to ≤29.1V during 400W surges, preventing latch-up or gate oxide damage in 30V-rated FETs and controllers. | Use Scenario: Input rail protection in point-of-load (POL) converters powering FPGA I/O banks or sensor signal chains. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12V/24V input to absorb load-dump energy from upstream vehicle battery systems. Use Value: Maintains <1μA leakage at 16.2V, avoiding quiescent current penalty in always-on subsystems while surviving ISO 7637-2 Pulse 1. |
| Lighting Application | Adapters |
Use Scenario: Overvoltage suppression in LED driver modules subjected to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional-capable variant not required; unidirectional P4SMA20H used with cathode to LED string anode to block reverse transients. Use Value: Fast <1ps response ensures clamping before LED string capacitance integrates damaging energy, preserving luminous efficacy and lifetime. | Use Scenario: Secondary-side surge protection in AC/DC wall adapters for consumer electronics and IoT gateways. IC Role / Device Role / Timing Role: TVS placed across output capacitor terminals to suppress line-to-line and line-to-ground transients induced by shared mains wiring. Use Value: 29.1V clamping prevents overvoltage stress on USB-PD controllers and LDOs rated for 3.3V–20V inputs, reducing field failure rates. |
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 | Same DO-214AA (SMB) package; 20V bidirectional; 600W PPPM; higher IPPM (33.3A) | Supports bipolar transients (e.g., RS-485 bus); requires layout change due to larger SMB footprint | Select SMBJ20A only if bidirectional protection or higher power margin is required and PCB space allows SMB pad layout |
| 1.5SMC20A | DO-214AB (SMC) package; 20V bidirectional; 1500W PPPM; 69.4A IPPM | Designed for high-energy industrial surges (IEC 61000-4-5 Level 4); incompatible pinout and thermal profile | Choose 1.5SMC20A for heavy-duty industrial equipment where 1500W rating and SMC mechanical robustness outweigh SMT placement constraints |
Compared with SMBJ20A and 1.5SMC20A, the P4SMA20H offers optimal balance of compact DO-214AC (SMA) footprint, AEC-Q101 qualification, and precise 16.2V stand-off for 24V automotive systems-making it preferred for space-constrained, automotive-compliant designs where unidirectional protection suffices.
Availability
P4SMA20H 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 automotive-grade reliability and rapid lead times.
Supply support for P4SMA20H 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q101 validation capabilities.
The P4SMA20H belongs to TSC's P4SMAxH series of 400W surface-mount TVS diodes engineered for automotive and industrial power rail protection-designed to replace older SMA packages with tighter VBR tolerances and enhanced surge immunity.
FAQ
Is P4SMA20H unidirectional or bidirectional?
The P4SMA20H is a unidirectional TVS diode, intended for protection of DC power rails where polarity is fixed. Its cathode band marking indicates the terminal to connect toward the protected line; it does not conduct in forward bias beyond ~3.5V. For bidirectional applications such as data lines, the P4SMA20AH variant or alternate part numbers with "CAH" suffix must be selected.
What is the clamping voltage of P4SMA20H and how is it measured?
The P4SMA20H has a maximum clamping voltage (VC) of 29.1 V at 14.0 A peak pulse current, tested using the standardized 10/1000μs double-exponential waveform per IEC 61000-4-5 and ANSI/IEEE C62.35. This value represents the upper limit of voltage imposed on the protected circuit during a 400W transient event, ensuring downstream components remain within safe operating limits.
Does P4SMA20H meet automotive qualification standards?
Yes, the P4SMA20H is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements for automotive electrical systems. It is rated for operating junction temperatures from –55°C to +150°C and packaged in moisture-sensitive Level 1 (J-STD-020) DO-214AC construction-making it suitable for engine control, body electronics, and infotainment power domains.
What is the leakage current specification for P4SMA20H at its working voltage?
The P4SMA20H exhibits a maximum reverse leakage current (IR) of 1 μA when biased at its working stand-off voltage (VWM) of 16.2 V. This ultra-low leakage ensures minimal power loss in always-on circuits and avoids false triggering in high-impedance sensing nodes, supporting energy-efficient designs in battery-powered and automotive standby systems.
Can P4SMA20H be used in place of P4SMA20AH?
No, the P4SMA20H and P4SMA20AH are distinct variants: P4SMA20H has a wider VBR range (18.0–22.0 V), while P4SMA20AH is tighter (19.0–21.0 V). They share identical package, power rating, and clamping performance, but interchangeability requires verification of system-level voltage margin. The P4SMA20AH offers improved consistency for precision-critical rails; substituting P4SMA20H may reduce design guardband.
P4SMA20H 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA20H FAQ
1.How can I place an order for P4SMA20H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA20H 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 P4SMA20H reliable?
The price and inventory of P4SMA20H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA20H is usually 5 days.
3.What payment methods are accepted for P4SMA20H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA20H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA20H?
P4SMA20H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA20H 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 P4SMA20H?
For technical support, including P4SMA20H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA20H requirements.
6.How does Aetrix verify that P4SMA20H is sourced from the original manufacturer or authorized distributors?
All P4SMA20H 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 P4SMA20H meets industry standards.
7.What is the process for return or replacement of P4SMA20H?
All P4SMA20H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA20H, 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 P4SMA20H part is unused and in its original packaging.
Return procedure for P4SMA20H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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