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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Taiwan Semiconductor Corporation P4SMA12

Name: P4SMA12
Brand: Taiwan Semiconductor Corporation
SKU: P4SMA12
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: P4SMA12

Manufacturer:: Taiwan Semiconductor Corporation

Category:: TVS Diodes

Package:: DO-214AC, SMA

Datasheet:: P4SMA12.pdf

Description:: 400W, 12V, 10%, UNIDIRECTIONAL,

Quantity:: RFQ Add To RFQ list

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Inventory:9,527

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Product details

Overview

P4SMA12 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for overvoltage protection in DC power rails. It features a 10.8–13.2 V breakdown voltage (V_BR), 9.72 V working stand-off voltage (V_WM), 17.3 V clamping voltage (V_C) at 24 A peak pulse current, and 400 W peak pulse power rating under 10/1000 µs waveform - ideal for protecting SMPS inputs and DC/DC converter feedback paths.

For engineers reviewing the P4SMA12 datasheet, P4SMA12 pinout, P4SMA12 application, or P4SMA12 equivalent, key selection criteria include its low leakage (<1 µA at V_WM), fast sub-1 ps response time, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and UL 94V-0 molded case - critical for automotive and industrial power supply surge immunity design.

Technical Context

The P4SMA12 operates as a unidirectional avalanche diode, conducting only in reverse bias above V_BR to clamp transients while maintaining <1 µA leakage below 9.72 V. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.

Designed for surface-mount automation, it uses a DO-214AC (SMA) package with matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance. Polarity is marked by a cathode band, and moisture sensitivity is rated Level 1 per J-STD-020.

Key Specifications

Parameter	Value and Actual Design Meaning
V_BR min/max	10.8 V / 13.2 V - defines minimum and maximum voltage at which avalanche conduction begins reliably at 1 mA test current
V_WM	9.72 V - maximum continuous reverse operating voltage before significant leakage occurs
V_C @ I_PPM	17.3 V at 24 A - clamped voltage during 10/1000 µs surge, limiting downstream circuit stress
P_PPM	400 W - peak pulse power handling capability, enabling robust protection against ISO 7637-2 pulses
I_R @ V_WM	<1 µA - ultra-low reverse leakage preserves efficiency in high-impedance sensing or feedback circuits
T_J max	150 °C - maximum junction temperature, supporting operation in enclosed or thermally constrained environments

Pinout & Package

Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode band marking polarity. Case meets UL 94V-0 flammability rating; terminals are matte tin-plated for reliable solder joint formation.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connected to lower-potential side of protected line (e.g., GND or return path)
Cathode (banded end)	Reverse-bias clamping terminal	Connected to higher-potential side (e.g., V_IN or signal line); conducts during overvoltage events

Key Features

Feature	Design Value
Fast response time	<1.0 ps - enables clamping before transient energy couples into sensitive ICs
Glass passivated junction	Stable V_BR tolerance and low parameter drift over temperature and lifetime
ISO 7637-2 compliance	Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) in automotive ECUs
Moisture sensitivity level	Level 1 (J-STD-020) - no bake required prior to reflow, simplifying SMT assembly

Applications

Switching Mode Power Supply (SMPS)	On-board DC/DC Converter
Use Scenario: Protects primary-side input rectifier and secondary-side output rectifier from line surges and switching spikes in AC/DC adapters and open-frame PSUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input capacitor or output rail to clamp ESD and load-dump transients before they reach controller ICs or MOSFETs. Use Value: With 17.3 V clamping at 24 A and 400 W peak power, P4SMA12 prevents latch-up or gate oxide damage in PWM controllers and synchronous rectifiers.	Use Scenario: Shields point-of-load (POL) converters in telecom baseband cards and industrial PLC modules from board-level coupling noise and hot-swap transients. IC Role / Device Role / Timing Role: Mounted directly at DC/DC converter input or feedback node to suppress fast-rising transients induced by adjacent high-speed digital switching. Use Value: Sub-1 ps response and 9.72 V V_WM ensure stable regulation without false triggering during normal 12 V rail operation.
Lighting Application	Automotive Body Control Module (BCM)
Use Scenario: Safeguards LED driver ICs and current-sense resistors in commercial LED streetlights exposed to lightning-induced surges on long input cables. IC Role / Device Role / Timing Role: Installed across bulk capacitor input to absorb 10/1000 µs surges up to 400 W without degradation. Use Value: UL 94V-0 molding compound and 150 °C T_J rating support operation in sealed, high-temperature outdoor enclosures.	Use Scenario: Integrated into LIN bus interface and sensor supply lines of BCMs to meet OEM requirements for ISO 7637-2 Pulse 1 (−100 V/50 Ω) and Pulse 2b (−25 V/2 Ω). IC Role / Device Role / Timing Role: Unidirectional clamping device on 12 V battery-supplied rails feeding microcontrollers and CAN/LIN transceivers. Use Value: Confirmed compliance with all five ISO 7637-2 pulses ensures qualification for Tier-1 automotive subsystems without additional filtering.

Switching Mode Power Supply (SMPS)

On-board DC/DC Converter

Use Scenario: Protects primary-side input rectifier and secondary-side output rectifier from line surges and switching spikes in AC/DC adapters and open-frame PSUs.

IC Role / Device Role / Timing Role: Unidirectional TVS placed across input capacitor or output rail to clamp ESD and load-dump transients before they reach controller ICs or MOSFETs.

Use Value: With 17.3 V clamping at 24 A and 400 W peak power, P4SMA12 prevents latch-up or gate oxide damage in PWM controllers and synchronous rectifiers.

Use Scenario: Shields point-of-load (POL) converters in telecom baseband cards and industrial PLC modules from board-level coupling noise and hot-swap transients.

IC Role / Device Role / Timing Role: Mounted directly at DC/DC converter input or feedback node to suppress fast-rising transients induced by adjacent high-speed digital switching.

Use Value: Sub-1 ps response and 9.72 V V_WM ensure stable regulation without false triggering during normal 12 V rail operation.

Lighting Application

Automotive Body Control Module (BCM)

Use Scenario: Safeguards LED driver ICs and current-sense resistors in commercial LED streetlights exposed to lightning-induced surges on long input cables.

IC Role / Device Role / Timing Role: Installed across bulk capacitor input to absorb 10/1000 µs surges up to 400 W without degradation.

Use Value: UL 94V-0 molding compound and 150 °C T_J rating support operation in sealed, high-temperature outdoor enclosures.

Use Scenario: Integrated into LIN bus interface and sensor supply lines of BCMs to meet OEM requirements for ISO 7637-2 Pulse 1 (−100 V/50 Ω) and Pulse 2b (−25 V/2 Ω).

IC Role / Device Role / Timing Role: Unidirectional clamping device on 12 V battery-supplied rails feeding microcontrollers and CAN/LIN transceivers.

Use Value: Confirmed compliance with all five ISO 7637-2 pulses ensures qualification for Tier-1 automotive subsystems without additional filtering.

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient suppression applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ12A	600 W peak power, DO-214AA (SMB) package, bidirectional variant available	Higher power handling but larger footprint; requires PCB layout change	Select when surge energy exceeds 400 W or bidirectional protection is needed
1.5SMC12A	1500 W peak power, DO-214AB (SMC) package, higher V_C (19.9 V)	Overkill for low-energy transients; adds cost and board space	Prefer for high-reliability industrial systems with unknown surge profiles

Compared with SMBJ12A and 1.5SMC12A, the P4SMA12 offers optimal balance of compact DO-214AC size, precise 9.72 V V_WM, and certified ISO 7637-2 compliance - making it the preferred choice for space-constrained 12 V rail protection where exact clamping voltage and automated assembly are critical.

Availability

P4SMA12 is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and automotive lighting systems requiring stable component supply with full traceability and lifecycle management.

Supply support for P4SMA12 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 for industrial, automotive, and consumer markets.

The P4SMA series belongs to TSC's surface-mount TVS portfolio engineered specifically for high-reliability transient suppression in automotive electronics and industrial power conversion - emphasizing ISO 7637-2 compliance, tight V_BR tolerance, and automated assembly readiness.

FAQ

What is the breakdown voltage range for P4SMA12?

The P4SMA12 has a guaranteed breakdown voltage (V_BR) range of 10.8 V to 13.2 V at 1.0 mA test current, measured per ANSI/IEEE C62.35 standards. This range ensures consistent avalanche initiation across production lots and temperature extremes, enabling predictable clamping behavior in 12 V system designs where margin between V_WM (9.72 V) and V_BR must accommodate tolerances without premature conduction.

Is P4SMA12 unidirectional or bidirectional?

P4SMA12 is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix. It conducts only in reverse bias above V_BR and blocks forward current like a standard rectifier. Its cathode band marks the clamping terminal, and it is not rated for bidirectional surge suppression - unlike P4SMA12C or P4SMA12CA variants which provide symmetrical clamping in both polarities.

What is the maximum clamping voltage of P4SMA12 under surge conditions?

The P4SMA12 exhibits a maximum clamping voltage (V_C) of 17.3 V when subjected to a 10/1000 µs surge waveform with a peak current (I_PPM) of 24 A. This value is measured per REA-defined pulse shape and represents the upper limit of voltage seen by downstream circuitry during worst-case transient events - critical for ensuring compatibility with 15 V-rated ICs and MOSFETs in protected 12 V rails.

Does P4SMA12 meet automotive surge immunity standards?

Yes, P4SMA12 meets ISO 7637-2 requirements for Pulses 1, 2a, 2b, 3a, and 3b - covering load dump, supply interruption, and capacitive coupling transients common in 12 V automotive networks. This certification is explicitly stated in the official Taiwan Semiconductor datasheet (Version S2102) and validates its use in body control modules, infotainment power supplies, and lighting drivers without additional external filtering.

What packaging and reel quantity is offered for P4SMA12?

P4SMA12 is supplied in DO-214AC (SMA) package on 7,500-piece tape-and-reel format, optimized for high-speed pick-and-place assembly. The package features matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance, and its Level 1 moisture sensitivity rating eliminates pre-bake requirements - streamlining manufacturing for P4SMA12 in high-volume industrial and automotive production lines.

P4SMA12 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):: 9.72V

Voltage - Breakdown (Min):: 10.8V

Voltage - Clamping (Max) @ Ipp:: 17.3V

Current - Peak Pulse (10/1000µs):: 24A

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)

P4SMA12 FAQ

1.How can I place an order for P4SMA12 through Aetrix?

Please submit a Request for Quotation (RFQ) for P4SMA12 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 P4SMA12 reliable?

The price and inventory of P4SMA12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA12 is usually 5 days.

3.What payment methods are accepted for P4SMA12?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA12 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for P4SMA12?

P4SMA12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your P4SMA12 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 P4SMA12?

For technical support, including P4SMA12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA12 requirements.

6.How does Aetrix verify that P4SMA12 is sourced from the original manufacturer or authorized distributors?

All P4SMA12 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 P4SMA12 meets industry standards.

7.What is the process for return or replacement of P4SMA12?

All P4SMA12 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA12, 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 P4SMA12 part is unused and in its original packaging.

Return procedure for P4SMA12:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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