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

Taiwan Semiconductor Corporation P4SMA27H

Name: P4SMA27H
Brand: Taiwan Semiconductor Corporation
SKU: P4SMA27H
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: P4SMA27H

Manufacturer:: Taiwan Semiconductor Corporation

Category:: TVS Diodes

Package:: DO-214AC, SMA

Datasheet:: P4SMA27H.pdf

Description:: 400W, 27V, 10%, UNIDIRECTIONAL,

Quantity:: RFQ Add To RFQ list

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Inventory:2,086

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Product details

Overview

P4SMA27H 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 24.3–29.7 V breakdown voltage (V_BR), 21.8 V working stand-off voltage (V_WM), 39.1 V maximum clamping voltage (V_C) at 10.7 A peak pulse current, and 400 W peak pulse power rating under 10/1000 µs waveform - deployed in automotive-grade SMPS and on-board DC/DC converters.

For engineers reviewing the P4SMA27H datasheet, P4SMA27H pinout, P4SMA27H application, or P4SMA27H equivalent, key selection criteria include its AEC-Q101 qualification, DO-214AC (SMA) package compatibility with automated placement, sub-1 ps response time, <1 µA leakage at V_WM, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive transients.

Technical Context

The P4SMA27H operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve fast transient suppression with low capacitance and stable breakdown characteristics. Its clamping behavior is defined by a 10/1000 µs double-exponential surge waveform, with thermal derating above 25°C per Figure 2 and non-repetitive peak power limited to 400 W at T_A = 25°C.

It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1, supporting lead-free reflow soldering. Polarity is marked by a cathode band, and the device is rated for -55°C to +150°C operating and storage temperature ranges.

Key Specifications

Parameter	Value and Actual Design Meaning
V_BR @ I_T = 1 mA	24.3–29.7 V: Ensures reliable avalanche conduction onset within specified tolerance for consistent overvoltage triggering
V_WM	21.8 V: Maximum continuous reverse voltage before significant leakage; sets safe DC operating margin below breakdown
V_C @ I_PPM = 10.7 A	39.1 V: Clamped voltage during 10/1000 µs surge; defines worst-case protected circuit voltage stress
P_PPM	400 W: Peak pulse power handling capability; determines survivability against standardized automotive load-dump surges
I_R @ V_WM	<1 µA: Ultra-low reverse leakage ensures minimal standby power loss and signal integrity in high-impedance circuits
Response Time	<1.0 ps: Enables suppression of nanosecond-scale ESD and fast-switching transients before downstream IC damage
T_J Range	-55°C to +150°C: Supports operation in under-hood automotive environments and industrial power systems

Pinout & Package

Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode band marking. Matte tin-plated leads comply with J-STD-002 solderability and UL 94V-0 flammability rating.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry / Reverse voltage reference	Connected to lower-potential side (e.g., GND or return path); defines polarity-sensitive clamping direction
Cathode	Reverse voltage input / Clamping output	Connected to protected line (e.g., 24 V rail); conducts during overvoltage to shunt energy to ground

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive electronics use, including engine control units and body electronics requiring reliability under thermal cycling and vibration
Glass passivated junction	Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives, critical for harsh-environment deployment
ISO 7637-2 compliance	Guarantees immunity to real-world automotive transients (Pulse 1, 2a, 2b, 3a, 3b), eliminating need for additional filtering stages
DO-214AC (SMA) footprint	Enables drop-in replacement in existing layouts designed for SMA packages; supports high-volume SMT assembly with standard pick-and-place equipment
Halogen-free & RoHS compliant	Meets IEC 61249-2-21 and EU RoHS directives, ensuring environmental compliance without sacrificing electrical performance

Applications

Automotive Power Supply Protection	Industrial DC/DC Converter Input
Use Scenario: Protecting 24 V battery-fed ECUs from load dump and alternator switching transients in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across input rail to clamp surges >39.1 V before reaching downstream regulators and microcontrollers. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic supplies by limiting transient voltage to ≤39.1 V at 10.7 A, per ISO 7637-2 Pulse 5a.	Use Scenario: Safeguarding isolated 48 V-to-12 V DC/DC converter inputs in factory automation controllers. IC Role / Device Role / Timing Role: Primary overvoltage clamp on primary-side bus, activated within <1 ps to suppress MOSFET switching spikes and EFT bursts. Use Value: Maintains system uptime by absorbing 400 W transient energy without degradation, enabling compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge).
LED Driver Power Input	Telecom Power Interface
Use Scenario: Securing constant-current LED drivers in streetlighting systems exposed to lightning-induced surges on 24–48 V supply lines. IC Role / Device Role / Timing Role: Front-end TVS element on driver input, conducting only during overvoltage events while remaining high-impedance during normal operation. Use Value: Eliminates need for redundant MOVs or gas discharge tubes due to low clamping ratio (V_C/V_WM = 1.79) and stable 21.8 V standoff.	Use Scenario: Protecting PoE-powered network switches' auxiliary 24 V DC input from induced surges on outdoor cabling runs. IC Role / Device Role / Timing Role: Standoff-rated TVS on secondary-side DC input, coordinated with upstream common-mode chokes to meet EN 61000-4-5 Level 3. Use Value: Provides precise 21.8 V hold-off with <1 µA leakage, preserving efficiency in always-on telecom infrastructure without false triggering.

Automotive Power Supply Protection

Industrial DC/DC Converter Input

Use Scenario: Protecting 24 V battery-fed ECUs from load dump and alternator switching transients in passenger vehicles.

IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across input rail to clamp surges >39.1 V before reaching downstream regulators and microcontrollers.

Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic supplies by limiting transient voltage to ≤39.1 V at 10.7 A, per ISO 7637-2 Pulse 5a.

Use Scenario: Safeguarding isolated 48 V-to-12 V DC/DC converter inputs in factory automation controllers.

IC Role / Device Role / Timing Role: Primary overvoltage clamp on primary-side bus, activated within <1 ps to suppress MOSFET switching spikes and EFT bursts.

Use Value: Maintains system uptime by absorbing 400 W transient energy without degradation, enabling compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge).

LED Driver Power Input

Telecom Power Interface

Use Scenario: Securing constant-current LED drivers in streetlighting systems exposed to lightning-induced surges on 24–48 V supply lines.

IC Role / Device Role / Timing Role: Front-end TVS element on driver input, conducting only during overvoltage events while remaining high-impedance during normal operation.

Use Value: Eliminates need for redundant MOVs or gas discharge tubes due to low clamping ratio (V_C/V_WM = 1.79) and stable 21.8 V standoff.

Use Scenario: Protecting PoE-powered network switches' auxiliary 24 V DC input from induced surges on outdoor cabling runs.

IC Role / Device Role / Timing Role: Standoff-rated TVS on secondary-side DC input, coordinated with upstream common-mode chokes to meet EN 61000-4-5 Level 3.

Use Value: Provides precise 21.8 V hold-off with <1 µA leakage, preserving efficiency in always-on telecom infrastructure without false triggering.

Equivalent & Alternatives

The following parts are listed as comparable options for similar TVS diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ24A	DO-214AA (SMB) package; 24 V V_WM, 38.9 V V_C @ 10.3 A; 600 W P_PPM	Higher power rating but larger footprint; less suitable for space-constrained SMA layouts	Select when higher surge margin is required and board area allows SMB package
1.5SMC27A	DO-214AB (SMC) package; 27 V V_WM, 43.5 V V_C @ 9.2 A; 1500 W P_PPM	Triple power rating but 3× larger footprint and higher clamping voltage; not AEC-Q101 qualified	Choose for non-automotive industrial surge zones where layout space permits and AEC-Q101 is not mandated

Compared with SMBJ24A and 1.5SMC27A, the P4SMA27H offers optimal balance of AEC-Q101 compliance, DO-214AC compactness, and precise 21.8 V standoff-making it preferred for automotive and space-limited industrial DC/DC designs where clamping voltage and leakage must be tightly controlled.

Availability

P4SMA27H is available at Aetrix Electronics and suitable for automotive power supply protection, industrial DC/DC converter input stages, and LED driver power inputs requiring stable component supply across production lifecycles.

Supply support for P4SMA27H 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 automotive, industrial, and consumer markets.

The P4SMA series belongs to TSC's AEC-Q101-qualified surface-mount TVS portfolio, engineered specifically for robust transient suppression in automotive electronics and high-reliability DC power systems.

FAQ

What is the breakdown voltage range of the P4SMA27H?

The P4SMA27H has a guaranteed breakdown voltage (V_BR) range of 24.3 V to 29.7 V at 1.0 mA test current, measured per ANSI/IEEE C62.35. This range reflects manufacturing tolerance and ensures consistent avalanche initiation across production lots while maintaining compatibility with 24 V nominal systems.

Is the P4SMA27H suitable for automotive applications?

Yes, the P4SMA27H is AEC-Q101 qualified and explicitly tested to ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b standards. Its DO-214AC package, -55°C to +150°C operating range, and glass-passivated junction make it suitable for under-hood and body-control module deployments where reliability under thermal and mechanical stress is mandatory.

What is the maximum clamping voltage of the P4SMA27H during a transient event?

The P4SMA27H exhibits a maximum clamping voltage (V_C) of 39.1 V at 10.7 A peak pulse current under the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is critical for ensuring downstream ICs remain within absolute maximum ratings.

Does the P4SMA27H have polarity markings, and how is it oriented in-circuit?

Yes, the P4SMA27H uses a cathode band marking on the DO-214AC package to indicate polarity. The cathode terminal connects to the protected line (e.g., 24 V rail), while the anode connects to ground or the return path - enabling unidirectional clamping only during reverse overvoltage conditions.

What packaging and reel quantity is offered for the P4SMA27H?

The P4SMA27H is supplied in DO-214AC (SMA) package format on tape-and-reel, with 7,500 units per reel. This configuration supports high-speed automated placement in SMT production lines and aligns with industry-standard feeding mechanisms used in electronics manufacturing.

P4SMA27H 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):: 21.8V

Voltage - Breakdown (Min):: 24.3V

Voltage - Clamping (Max) @ Ipp:: 39.1V

Current - Peak Pulse (10/1000µs):: 10.7A

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)

P4SMA27H FAQ

1.How can I place an order for P4SMA27H through Aetrix?

Please submit a Request for Quotation (RFQ) for P4SMA27H 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 P4SMA27H reliable?

The price and inventory of P4SMA27H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA27H is usually 5 days.

3.What payment methods are accepted for P4SMA27H?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA27H transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for P4SMA27H?

P4SMA27H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your P4SMA27H 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 P4SMA27H?

For technical support, including P4SMA27H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA27H requirements.

6.How does Aetrix verify that P4SMA27H is sourced from the original manufacturer or authorized distributors?

All P4SMA27H 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 P4SMA27H meets industry standards.

7.What is the process for return or replacement of P4SMA27H?

All P4SMA27H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA27H, 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 P4SMA27H part is unused and in its original packaging.

Return procedure for P4SMA27H:

1.Submit a request within 90 days.

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

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