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

Taiwan Semiconductor Corporation P4SMA120

Name: P4SMA120
Brand: Taiwan Semiconductor Corporation
SKU: P4SMA120
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: P4SMA120

Manufacturer:: Taiwan Semiconductor Corporation

Category:: TVS Diodes

Package:: DO-214AC, SMA

Datasheet:: P4SMA120.pdf

Description:: 400W, 120V, 10%, UNIDIRECTIONAL,

Quantity:: RFQ Add To RFQ list

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Inventory:6,969

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Product details

Overview

P4SMA120 from Taiwan Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping transient overvoltages in DC power lines. It features a 108–132 V breakdown voltage (V_BR), 97.2 V working stand-off voltage (V_WM), 173 V maximum clamping voltage (V_C) at 2.4 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform.

For engineers reviewing the P4SMA120 datasheet, P4SMA120 pinout, P4SMA120 application, or P4SMA120 equivalent, key selection criteria include its unidirectional polarity, low leakage (<1 µA at V_WM), fast response (<1.0 ps), ISO 7637-2 compliance, and suitability for automotive and industrial DC/DC converter protection where precise voltage clamping and high surge immunity are required.

Technical Context

The P4SMA120 operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified V_BR range (108–132 V at 1.0 mA test current). Its glass-passivated junction ensures stable breakdown characteristics and low leakage across -55°C to +150°C operating temperature range.

It delivers 400 W peak pulse power under standardized 10/1000 µs waveform, with clamping performance validated at 2.4 A (I_PPM) yielding V_C ≤ 173 V - enabling robust protection of downstream 100–120 V nominal systems against load dump and inductive switching transients.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	97.2 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe DC bias margin for 100 V rail protection.
V_BR min/max	108 V / 132 V at 1.0 mA - Confirmed breakdown threshold range; ensures reliable triggering above system nominal voltage.
V_C @ I_PPM	173 V at 2.4 A, 10/1000 µs - Clamped voltage seen by protected circuit during worst-case surge; limits stress on 200 V-rated components.
P_PPM	400 W - Peak pulse power handling capability; supports single-event surge energy up to 400 mJ (calculated).
I_R @ V_WM	<1 µA - Extremely low reverse leakage at rated stand-off voltage; avoids parasitic loading in high-impedance sensing or standby circuits.
T_J max	+150 °C - Maximum junction temperature; enables operation in under-hood automotive or enclosed industrial environments.
Package	DO-214AC (SMA) - Standardized surface-mount outline with cathode band marking; compatible with automated pick-and-place and reflow soldering.

Pinout & Package

DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band. Weight ≈ 0.060 g. Meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance standards.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connected to lower-potential side (e.g., ground or return path); conducts during forward surge or ESD events.
Cathode	Reverse-biased clamping terminal	Connected to protected line (e.g., 100 V rail); avalanches into conduction when transient exceeds V_BR, shunting surge current to ground.

Key Features

Feature	Design Value
Glass passivated junction	Ensures stable V_BR tolerance and long-term reliability under thermal cycling and humidity exposure.
Fast response time	<1.0 ps - Enables clamping before transient energy couples into sensitive ICs, critical for protecting CAN/LIN bus interfaces and microcontrollers.
ISO 7637-2 compliance	Validated for Pulse 1, 2a, 2b, 3a, and 3b waveforms - meets automotive OEM requirements for battery line transient immunity.
Moisture sensitivity level	MSL Level 1 (per J-STD-020) - No floor life limitation; allows indefinite storage and standard SMT processing without baking.
RoHS & halogen-free	Complies with EU RoHS Directive 2011/65/EU and IEC 61249-2-21 - supports environmentally constrained industrial and automotive supply chains.

Applications

Automotive Load Dump Protection	Industrial DC/DC Converter Input
Use Scenario: Protecting 12 V/24 V vehicle electronics during alternator load dump events (ISO 7637-2 Pulse 5a/b), where voltage spikes exceed 100 V. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC/DC input, clamping surges within microseconds to prevent MOSFET gate oxide failure or controller latch-up. Use Value: With V_C = 173 V at 2.4 A, P4SMA120 limits peak stress on 200 V input-stage components while surviving repeated 400 W pulses per JEDEC standards.	Use Scenario: Safeguarding isolated DC/DC converters in programmable logic controllers (PLCs) fed from 100 V DC industrial buses. IC Role / Device Role / Timing Role: Primary-side transient suppressor on converter input, absorbing inductive kickback from relay coils or motor drivers upstream. Use Value: 97.2 V V_WM provides 3% margin above 100 V nominal rail, while 173 V V_C ensures downstream 200 V-rated capacitors and FETs remain within safe operating area.
Telecom Power Supply Clamp	LED Driver Overvoltage Protection
Use Scenario: Secondary-side overvoltage suppression in telecom AC/DC front-ends supplying 48 V or 54 V distributed power rails. IC Role / Device Role / Timing Role: Standoff clamp on regulated output, activated only during fault conditions (e.g., feedback loop failure or rectifier short). Use Value: Low leakage (<1 µA) prevents load regulation error; 108–132 V V_BR range aligns with 110 V nominal telecom backup supplies, ensuring clean shutdown before damage occurs.	Use Scenario: Protecting constant-current LED drivers in streetlight systems exposed to lightning-induced surges on 100–120 V AC-derived DC bus. IC Role / Device Role / Timing Role: Line-to-ground TVS on driver input, diverting induced transients away from PWM controller and current-sense amplifier. Use Value: 400 W peak power rating handles multi-kV lightning surges attenuated by upstream MOVs; DO-214AC footprint enables compact layout near connector entry points.

Automotive Load Dump Protection

Industrial DC/DC Converter Input

Use Scenario: Protecting 12 V/24 V vehicle electronics during alternator load dump events (ISO 7637-2 Pulse 5a/b), where voltage spikes exceed 100 V.

IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC/DC input, clamping surges within microseconds to prevent MOSFET gate oxide failure or controller latch-up.

Use Value: With V_C = 173 V at 2.4 A, P4SMA120 limits peak stress on 200 V input-stage components while surviving repeated 400 W pulses per JEDEC standards.

Use Scenario: Safeguarding isolated DC/DC converters in programmable logic controllers (PLCs) fed from 100 V DC industrial buses.

IC Role / Device Role / Timing Role: Primary-side transient suppressor on converter input, absorbing inductive kickback from relay coils or motor drivers upstream.

Use Value: 97.2 V V_WM provides 3% margin above 100 V nominal rail, while 173 V V_C ensures downstream 200 V-rated capacitors and FETs remain within safe operating area.

Telecom Power Supply Clamp

LED Driver Overvoltage Protection

Use Scenario: Secondary-side overvoltage suppression in telecom AC/DC front-ends supplying 48 V or 54 V distributed power rails.

IC Role / Device Role / Timing Role: Standoff clamp on regulated output, activated only during fault conditions (e.g., feedback loop failure or rectifier short).

Use Value: Low leakage (<1 µA) prevents load regulation error; 108–132 V V_BR range aligns with 110 V nominal telecom backup supplies, ensuring clean shutdown before damage occurs.

Use Scenario: Protecting constant-current LED drivers in streetlight systems exposed to lightning-induced surges on 100–120 V AC-derived DC bus.

IC Role / Device Role / Timing Role: Line-to-ground TVS on driver input, diverting induced transients away from PWM controller and current-sense amplifier.

Use Value: 400 W peak power rating handles multi-kV lightning surges attenuated by upstream MOVs; DO-214AC footprint enables compact layout near connector entry points.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ120A	Bidirectional variant; V_BR = 133–147 V; V_C = 193 V @ 2.1 A; same 400 W rating but higher clamping voltage.	Required where AC-coupled or bidirectional transients (e.g., data lines) must be suppressed; unsuitable for unidirectional DC rail protection without polarity redesign.	Select P4SMA120 for cost-sensitive, unidirectional 100 V rail clamping; choose SMBJ120A only if bidirectional capability is mandatory.
1.5KE120A	Through-hole DO-201 package; V_BR = 128–141 V; V_C = 193 V @ 2.1 A; same power rating but larger footprint and manual assembly requirement.	Used in legacy designs or high-reliability aerospace systems where leaded packages are mandated; incompatible with modern SMT production lines.	P4SMA120 offers identical electrical performance in smaller DO-214AC package, reducing PCB area and enabling automated manufacturing.

Compared with SMBJ120A and 1.5KE120A, the P4SMA120 provides lower clamping voltage (173 V vs. 193 V), tighter V_BR tolerance (108–132 V vs. 128–147 V), and surface-mount compatibility - making it optimal for space-constrained, high-volume automotive and industrial DC power protection.

Availability

P4SMA120 is available at Aetrix Electronics and suitable for automotive load dump protection, industrial DC/DC converter input stages, and telecom power supply clamping requiring stable component supply, full traceability, and lifecycle continuity.

Supply support for P4SMA120 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 power devices since 1979.

The P4SMA series targets cost-effective, high-reliability transient suppression in automotive, industrial, and consumer power systems - engineered for robust surge immunity, automated assembly, and compliance with global environmental standards.

FAQ

What is the polarity configuration of the P4SMA120?

The P4SMA120 is a unidirectional TVS diode, with cathode marked by a band on the DO-214AC package body. It conducts in reverse bias above V_BR and blocks forward current up to 3.5 V at 25 A. This configuration is optimized for DC rail protection where polarity is fixed, unlike bidirectional variants such as P4SMA120A.

Does the P4SMA120 meet automotive transient standards?

Yes, the P4SMA120 meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for automotive electrical systems. Its 400 W peak pulse power rating and 173 V clamping voltage at 2.4 A ensure compliance with load dump and coupled transient immunity tests common in passenger vehicle and commercial truck ECUs.

What is the maximum operating temperature for the P4SMA120?

The P4SMA120 has a maximum junction temperature (T_J) of +150°C and operates across -55°C to +150°C ambient range. This rating supports deployment in under-hood automotive modules, industrial motor drives, and outdoor lighting systems where thermal management is constrained.

How does the P4SMA120 compare to the P4SMA120A variant?

The P4SMA120 has a V_BR range of 108–132 V and V_C = 173 V, while the P4SMA120A offers tighter V_BR (114–126 V) and lower V_C (165 V). Both share identical package, power rating, and leakage specs. Choose P4SMA120 for general-purpose 100 V rail clamping; select P4SMA120A when tighter voltage control is critical for precision protection.

Is the P4SMA120 RoHS and halogen-free compliant?

Yes, the P4SMA120 is RoHS compliant per EU Directive 2011/65/EU and halogen-free per IEC 61249-2-21. Its molding compound contains no brominated flame retardants or chlorine-based additives, supporting green manufacturing and end-of-life recycling requirements for industrial and automotive customers.

P4SMA120 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):: 97.2V

Voltage - Breakdown (Min):: 108V

Voltage - Clamping (Max) @ Ipp:: 173V

Current - Peak Pulse (10/1000µs):: 2.4A

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)

P4SMA120 FAQ

1.How can I place an order for P4SMA120 through Aetrix?

Please submit a Request for Quotation (RFQ) for P4SMA120 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 P4SMA120 reliable?

The price and inventory of P4SMA120 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA120 is usually 5 days.

3.What payment methods are accepted for P4SMA120?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA120 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for P4SMA120?

P4SMA120 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your P4SMA120 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 P4SMA120?

For technical support, including P4SMA120 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA120 requirements.

6.How does Aetrix verify that P4SMA120 is sourced from the original manufacturer or authorized distributors?

All P4SMA120 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 P4SMA120 meets industry standards.

7.What is the process for return or replacement of P4SMA120?

All P4SMA120 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA120, 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 P4SMA120 part is unused and in its original packaging.

Return procedure for P4SMA120:

1.Submit a request within 90 days.

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

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