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Taiwan Semiconductor Corporation P4SMA20AH
- Part No.:
- P4SMA20AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA20AH.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,249
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Product details
Overview
P4SMA20AH 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 19.0–21.0 V breakdown voltage (VBR), 17.1 V working stand-off voltage (VWM), 27.7 V clamping voltage (VC) at 15.0 A peak pulse current, 400 W peak pulse power rating (10/1000 µs), and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the P4SMA20AH datasheet, P4SMA20AH pinout, P4SMA20AH application, or P4SMA20AH equivalent, key selection criteria include its DO-214AC (SMA) package compatibility, low leakage (<1 µA at VWM), fast sub-1 ps response, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive transient immunity.
Technical Context
The P4SMA20AH operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve stable, repeatable clamping under repetitive surge events. Its 150 °C maximum junction temperature and -55 °C to +150 °C operating range support deployment in under-hood automotive electronics and industrial power supplies.
It delivers 27.7 V clamping at 15.0 A (10/1000 µs waveform), with <1 µA reverse leakage at 17.1 V and a 0.090 %/°C VBR temperature coefficient - enabling predictable performance across thermal gradients without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 1.0 mA | 19.0–21.0 V: Ensures reliable turn-on above normal rail voltage while avoiding false triggering during transients. |
| VWM | 17.1 V: Maximum continuous DC or RMS voltage the device blocks without significant leakage. |
| VC @ IPPM = 15.0 A | 27.7 V: Clamped voltage seen by protected circuit during worst-case 400 W surge - defines downstream IC survivability margin. |
| PPPM | 400 W (10/1000 µs): Peak surge energy handling capacity compatible with ISO 7637-2 automotive test pulses. |
| IR @ VWM | <1 µA: Minimal standby power loss and negligible loading on sensitive voltage references or high-impedance nodes. |
| Junction Temp Range | -55 °C to +150 °C: Enables use in engine control units, DC/DC converters, and lighting modules exposed to extreme ambient conditions. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode band marking. Matte tin-plated leads meet J-STD-002 solderability; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected line (e.g., 12 V rail); conducts during reverse-biased surge event. |
| Cathode | Ground/Return side | Connected to system ground or low-impedance return path; defines unidirectional clamping polarity. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and infotainment power rails. |
| Glass passivated junction | Enhances long-term stability and resistance to humidity-induced degradation in harsh environments. |
| Clamping time <1.0 ps | Responds before most microsecond-scale transients fully develop - critical for protecting fast-switching MOSFETs and gate drivers. |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) without failure. |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive - supports environmentally compliant manufacturing and end-of-life processing. |
Applications
| Automotive Power Rail Protection | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery input and upstream fuse or DC/DC converter input. Use Value: Limits voltage to ≤27.7 V during 400 W surges, preventing damage to 36 V-rated input stages of automotive PMICs and microcontrollers. | Use Scenario: Safeguarding isolated DC/DC converter primary-side inputs in factory automation controllers. IC Role / Device Role / Timing Role: Standoff protection element absorbing repetitive switching noise and EFT bursts on 24 V industrial bus lines. Use Value: Sub-1 µA leakage avoids loading precision feedback networks; DO-214AC footprint enables automated placement alongside SMT magnetics and MOSFETs. |
| LED Driver Supply Line | Adapter Output Stage |
Use Scenario: Suppressing inductive kickback from LED string current regulation circuits in automotive headlamps. IC Role / Device Role / Timing Role: Parallel-connected TVS across output capacitor to clamp flyback spikes from buck controller MOSFET turn-off. Use Value: 27.7 V clamping ensures LED driver ICs with 30 V absolute max ratings remain within safe operating area during transient events. | Use Scenario: Secondary-side overvoltage suppression in AC/DC wall adapters powering consumer electronics. IC Role / Device Role / Timing Role: Final-stage protection device after rectification and filtering, before USB-PD or linear regulator input. Use Value: 17.1 V VWM allows compatibility with 15 V nominal outputs while providing 12.6 V margin to clamping threshold - minimizing false trips during line regulation ripple. |
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 | DO-214AA (SMB) package; 20 V VWM, 32.4 V VC @ 12.3 A; same 400 W rating. | Larger footprint (SMB vs SMA) requires PCB layout change; higher clamping voltage reduces protected IC margin. | Select when board space permits larger package and higher clamping is acceptable for downstream 36 V-rated components. |
| 1.5SMC20A | DO-214AB (SMC) package; 20 V VWM, 32.4 V VC @ 12.3 A; 1500 W rating but physically larger. | Not drop-in: SMC footprint incompatible with SMA pads; intended for higher-energy surges beyond ISO 7637-2 scope. | Choose only if system-level testing reveals insufficient margin with P4SMA20AH and layout revision is feasible. |
Compared with SMBJ20A and 1.5SMC20A, the P4SMA20AH offers the smallest footprint (DO-214AC), lowest clamping voltage (27.7 V), and AEC-Q101 qualification - making it optimal for space-constrained, automotive-compliant designs where precise voltage limiting is critical.
Availability
P4SMA20AH is available at Aetrix Electronics and suitable for automotive power rail protection, industrial DC/DC converter input stages, and LED driver supply lines requiring stable component supply and full AEC-Q101 traceability.
Supply support for P4SMA20AH 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 capability.
The P4SMA20AH belongs to TSC's P4SMAx(A)H family of 400 W surface-mount TVS diodes engineered specifically for automotive and industrial transient immunity - balancing compact size, low clamping, and standardized qualification.
FAQ
What is the polarity configuration of the P4SMA20AH?
The P4SMA20AH is a unidirectional TVS diode with cathode-band marking indicating the cathode terminal. It conducts only during reverse-bias overvoltage events - i.e., when the anode is more positive than the cathode by ≥19.0 V. This configuration protects positive-rail systems like 12 V automotive supplies and must be oriented accordingly on PCBs.
Does the P4SMA20AH meet automotive qualification standards?
Yes, the P4SMA20AH is AEC-Q101 qualified and explicitly tested to ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements. Its glass-passivated junction, 150 °C TJMAX, and moisture sensitivity level 1 rating confirm suitability for under-hood and chassis-mounted automotive electronics where reliability under thermal and mechanical stress is mandatory.
What is the maximum clamping voltage of the P4SMA20AH under standard test conditions?
The P4SMA20AH has a maximum clamping voltage (VC) of 27.7 V when subjected to a 10/1000 µs surge waveform at 15.0 A peak current. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case transients - critical for ensuring downstream ICs remain within their absolute maximum ratings.
Can the P4SMA20AH be used in bidirectional applications?
No - the P4SMA20AH is unidirectional only. For bidirectional protection, Taiwan Semiconductor specifies parts with "CH" or "CAH" suffixes (e.g., P4SMA20CH). Using the P4SMA20AH in reverse-bias forward conduction mode risks permanent damage due to its non-symmetrical structure and lack of rated forward surge capability in that orientation.
What is the leakage current specification for the P4SMA20AH at its working voltage?
The P4SMA20AH exhibits a maximum reverse leakage current (IR) of 1 µA when biased at its rated working stand-off voltage of 17.1 V. This ultra-low leakage minimizes power loss in always-on systems and prevents interference with high-impedance sensing nodes, such as those found in battery monitoring or precision voltage reference circuits.
P4SMA20AH 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA20AH FAQ
1.How can I place an order for P4SMA20AH through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA20AH 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 P4SMA20AH reliable?
The price and inventory of P4SMA20AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA20AH is usually 5 days.
3.What payment methods are accepted for P4SMA20AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA20AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA20AH?
P4SMA20AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA20AH 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 P4SMA20AH?
For technical support, including P4SMA20AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA20AH requirements.
6.How does Aetrix verify that P4SMA20AH is sourced from the original manufacturer or authorized distributors?
All P4SMA20AH 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 P4SMA20AH meets industry standards.
7.What is the process for return or replacement of P4SMA20AH?
All P4SMA20AH units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA20AH, 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 P4SMA20AH part is unused and in its original packaging.
Return procedure for P4SMA20AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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