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

Taiwan Semiconductor Corporation P4SMA7.5

Name: P4SMA7.5
Brand: Taiwan Semiconductor Corporation
SKU: P4SMA7.5
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: P4SMA7.5

Manufacturer:: Taiwan Semiconductor Corporation

Category:: TVS Diodes

Package:: DO-214AC, SMA

Datasheet:: P4SMA7.5.pdf

Description:: 400W, 7.5V, 10%, UNIDIRECTIONAL,

Quantity:: RFQ Add To RFQ list

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Inventory:3,197

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Product details

Overview

P4SMA7.5 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary-side overvoltage protection in DC power rails. It features a 6.75–8.25 V breakdown voltage (V_BR), 6.05 V working stand-off voltage (V_WM), 11.7 V clamping voltage (V_C) at 35 A peak pulse current, and 400 W peak pulse power rating under 10/1000 µs waveform-optimized for surge suppression in switching mode power supplies.

For engineers reviewing the P4SMA7.5 datasheet, P4SMA7.5 pinout, P4SMA7.5 application, or P4SMA7.5 equivalent, key selection criteria include its DO-214AC (SMA) package compatibility, sub-1 ps response time, <500 µA reverse leakage at V_WM, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and junction temperature range of –55°C to +150°C.

Technical Context

The P4SMA7.5 operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast clamping during transient events. Its electrical behavior follows IEEE C62.35 standards, with breakdown tested at 10 mA and clamping verified at 35 A using standardized 10/1000 µs surge waveform.

It delivers stable protection across automotive and industrial ambient conditions, supported by derating curves up to 150°C junction temperature and moisture sensitivity level 1 per J-STD-020. Polarity is marked via cathode band on the DO-214AC case, and terminals are matte tin-plated for J-STD-002 solderability.

Key Specifications

Parameter	Value and Actual Design Meaning
V_BR min/max	6.75–8.25 V at 10 mA test current - defines reliable avalanche initiation threshold for overvoltage detection
V_WM	6.05 V - maximum continuous DC or RMS voltage the device blocks without significant leakage
V_C @ I_PPM	11.7 V at 35 A - clamped voltage seen by protected circuit during 400 W transient event
I_R @ V_WM	<500 µA - ensures minimal standby power loss and signal integrity in low-power systems
P_PPM	400 W (10/1000 µs) - peak surge energy absorption capability for automotive load-dump and inductive switching events
T_J max	+150°C - enables operation in high-temperature environments such as enclosed power adapters or engine bay electronics
Package	DO-214AC (SMA) - industry-standard SMD outline with 0.060 g mass and UL 94V-0 molding compound

Pinout & Package

Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode band marking. Case meets UL 94V-0 flammability rating; leads are matte tin-plated and compliant with J-STD-002 solderability requirements.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connected to lower-potential side of protected line; conducts during forward surge or bias
Cathode	Reverse-biased clamping terminal	Connected to higher-potential rail; avalanches into conduction when reverse voltage exceeds V_BR

Key Features

Feature	Design Value
Glass passivated junction	Ensures long-term reliability and stable V_BR performance under thermal cycling and humidity stress
Response time <1.0 ps	Enables suppression of ultrafast ESD and lightning-induced transients before downstream ICs are damaged
ISO 7637-2 compliance	Validated for automotive-grade Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling)
Moisture sensitivity level 1	Allows unlimited floor life and reflow without baking-reduces manufacturing overhead in high-volume SMT lines
Halogen-free & RoHS	Meets IEC 61249-2-21 and EU RoHS Directive for environmentally compliant end-product certification

Applications

Switching Mode Power Supply (SMPS)	On-board DC/DC Converter
Use Scenario: Input-stage transient protection against AC line surges and MOSFET switching spikes in offline AC/DC converters. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between rectified input and bulk capacitor to limit voltage overshoot. Use Value: Clamps to 11.7 V at 35 A, preventing damage to primary-side controllers and gate drivers rated for ≤20 V absolute maximum.	Use Scenario: Protection of low-voltage rails (e.g., 5 V, 3.3 V) in point-of-load converters exposed to board-level ESD and back-EMF. IC Role / Device Role / Timing Role: Secondary-side TVS placed across output terminals to absorb coupled transients from adjacent switching circuits. Use Value: Sub-1 ps response ensures clamping occurs before sensitive logic or analog ICs experience latch-up or parametric shift.
Lighting Application	Adapters
Use Scenario: Surge protection in LED driver modules subjected to hot-plug events and cable discharge in commercial lighting systems. IC Role / Device Role / Timing Role: Standoff-rated TVS on constant-current output path to prevent LED string overvoltage during fault recovery. Use Value: 6.05 V V_WM allows safe operation with 5 V nominal outputs while maintaining margin against ripple-induced false triggering.	Use Scenario: Input-stage protection in wall-mounted AC/DC adapters handling variable mains conditions and user-induced surges. IC Role / Device Role / Timing Role: Primary-side unidirectional TVS across bridge rectifier output to absorb repetitive line transients. Use Value: 400 W peak power rating supports repeated 10/1000 µs surges without degradation-critical for consumer adapter lifetime compliance.

Switching Mode Power Supply (SMPS)

On-board DC/DC Converter

Use Scenario: Input-stage transient protection against AC line surges and MOSFET switching spikes in offline AC/DC converters.

IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between rectified input and bulk capacitor to limit voltage overshoot.

Use Value: Clamps to 11.7 V at 35 A, preventing damage to primary-side controllers and gate drivers rated for ≤20 V absolute maximum.

Use Scenario: Protection of low-voltage rails (e.g., 5 V, 3.3 V) in point-of-load converters exposed to board-level ESD and back-EMF.

IC Role / Device Role / Timing Role: Secondary-side TVS placed across output terminals to absorb coupled transients from adjacent switching circuits.

Use Value: Sub-1 ps response ensures clamping occurs before sensitive logic or analog ICs experience latch-up or parametric shift.

Lighting Application

Adapters

Use Scenario: Surge protection in LED driver modules subjected to hot-plug events and cable discharge in commercial lighting systems.

IC Role / Device Role / Timing Role: Standoff-rated TVS on constant-current output path to prevent LED string overvoltage during fault recovery.

Use Value: 6.05 V V_WM allows safe operation with 5 V nominal outputs while maintaining margin against ripple-induced false triggering.

Use Scenario: Input-stage protection in wall-mounted AC/DC adapters handling variable mains conditions and user-induced surges.

IC Role / Device Role / Timing Role: Primary-side unidirectional TVS across bridge rectifier output to absorb repetitive line transients.

Use Value: 400 W peak power rating supports repeated 10/1000 µs surges without degradation-critical for consumer adapter lifetime compliance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ7.0A	DO-214AA (SMB) package; 7.0 V V_WM; 12.0 V V_C @ 32.1 A; same 400 W rating	Larger footprint (SMB vs SMA); slightly lower clamping but higher I_PPM tolerance	Select SMBJ7.0A only if PCB layout accommodates larger DO-214AA and requires marginally tighter V_WM control
1.5SMC7.0A	DO-214AB (SMC) package; 7.0 V V_WM; 12.6 V V_C @ 31.8 A; 1500 W rating	Higher power rating and larger thermal mass-but incompatible pinout and footprint	Choose 1.5SMC7.0A only for high-energy surge environments where P4SMA7.5's 400 W is insufficient

Compared with SMBJ7.0A and 1.5SMC7.0A, the P4SMA7.5 offers optimal space efficiency in compact designs requiring DO-214AC footprint, precise 6.05 V standoff, and certified ISO 7637-2 immunity-without over-specifying power or sacrificing manufacturability.

Availability

P4SMA7.5 is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply, automotive-grade surge immunity, and RoHS-compliant SMT assembly.

Supply support for P4SMA7.5 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 protection components for industrial and automotive markets.

The P4SMA7.5 belongs to TSC's P4SMAx series of 400 W surface-mount TVS diodes, engineered specifically for cost-sensitive, high-reliability DC rail protection in power conversion and interface circuits.

FAQ

What is the polarity configuration of the P4SMA7.5?

The P4SMA7.5 is a unidirectional TVS diode with clearly marked cathode band on the DO-214AC package. Its anode connects to the lower-potential node and cathode to the higher-potential rail, enabling reverse-biased clamping during overvoltage events. This configuration matches standard DC rail protection layouts and differs from bidirectional variants like P4SMA7.5CA.

Does the P4SMA7.5 meet automotive surge immunity standards?

Yes, the P4SMA7.5 meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling). Its 400 W peak pulse power rating, 11.7 V clamping voltage at 35 A, and –55°C to +150°C operating range make it suitable for automotive body electronics and infotainment power rails.

What is the maximum reverse leakage current for the P4SMA7.5 at its working voltage?

The P4SMA7.5 exhibits a maximum reverse leakage current of 500 µA at its specified working stand-off voltage of 6.05 V. This low leakage ensures minimal power loss in battery-powered or energy-efficient systems and avoids false triggering in precision voltage monitoring circuits.

Can the P4SMA7.5 be used in bidirectional protection applications?

No-the P4SMA7.5 is strictly unidirectional. For bidirectional surge protection, engineers must select the P4SMA7.5CA variant, which uses a center-tapped dual-diode configuration and carries the "CA" suffix. Using the P4SMA7.5 in reverse-biased AC or differential signal paths will result in forward conduction and failure.

What is the moisture sensitivity level (MSL) rating for the P4SMA7.5?

The P4SMA7.5 has a moisture sensitivity level (MSL) rating of Level 1 per J-STD-020, meaning it may be stored indefinitely at ambient conditions without baking prior to reflow soldering. This eliminates pre-bake steps in high-volume SMT assembly and reduces process complexity versus higher-MSL discrete components.

P4SMA7.5 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):: 6.05V

Voltage - Breakdown (Min):: 6.75V

Voltage - Clamping (Max) @ Ipp:: 11.7V

Current - Peak Pulse (10/1000µs):: 35A

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)

P4SMA7.5 FAQ

1.How can I place an order for P4SMA7.5 through Aetrix?

Please submit a Request for Quotation (RFQ) for P4SMA7.5 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 P4SMA7.5 reliable?

The price and inventory of P4SMA7.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA7.5 is usually 5 days.

3.What payment methods are accepted for P4SMA7.5?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA7.5 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for P4SMA7.5?

P4SMA7.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your P4SMA7.5 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 P4SMA7.5?

For technical support, including P4SMA7.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA7.5 requirements.

6.How does Aetrix verify that P4SMA7.5 is sourced from the original manufacturer or authorized distributors?

All P4SMA7.5 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 P4SMA7.5 meets industry standards.

7.What is the process for return or replacement of P4SMA7.5?

All P4SMA7.5 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA7.5, 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 P4SMA7.5 part is unused and in its original packaging.

Return procedure for P4SMA7.5:

1.Submit a request within 90 days.

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

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