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

Taiwan Semiconductor Corporation SMAJ110A

Name: SMAJ110A
Brand: Taiwan Semiconductor Corporation
SKU: SMAJ110A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMAJ110A

Manufacturer:: Taiwan Semiconductor Corporation

Category:: TVS Diodes

Package:: DO-214AC, SMA

Datasheet:: SMAJ110A.pdf

Description:: TVS DIODE 110VWM 177VC DO214AC

Quantity:: RFQ Add To RFQ list

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Inventory:2,983

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Product details

Overview

SMAJ110A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power (10/1000μs), 110V working stand-off voltage (V_WM), and 177V maximum clamping voltage (V_C@I_PPM). It protects DC/DC converters and SMPS inputs against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.

For engineers reviewing the SMAJ110A datasheet, SMAJ110A pinout, SMAJ110A application, or SMAJ110A equivalent, key selection criteria include clamping performance at 110V V_WM, unidirectional polarity marking, DO-214AC thermal derating above 25°C, and compliance with J-STD-020 Level 1 moisture sensitivity.

Technical Context

The SMAJ110A uses a glass-passivated silicon junction to achieve fast response (<1.0 ps from 0 V to V_BR min) and low leakage (<1 μA @ 110 V). Its single-die unidirectional configuration provides asymmetrical conduction-blocking reverse current until breakdown, then clamping surges within defined V_C limits.

Designed for automotive and industrial environments, it meets ISO 7637-2 immunity requirements for load dump and inductive switching transients. Thermal performance is governed by junction-to-ambient resistance and derates linearly above 25°C per Fig.2, with T_J_MAX = 150°C and T_STG = –55°C to +150°C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	110 V - Maximum continuous reverse operating voltage before clamping begins
V_BR @ I_T=1 mA	122–135 V - Breakdown voltage range confirming reliable turn-on margin above V_WM
V_C @ I_PPM	177 V - Clamped voltage during 400W 10/1000μs surge, limiting downstream stress
P_PK	400 W - Peak pulse power handling capability under standard waveform (derated above 25°C)
I_R @ V_WM	<1 μA - Ultra-low reverse leakage ensures minimal standby power loss in high-impedance circuits
Package	DO-214AC (SMA) - Surface-mount outline with cathode band, UL 94V-0 molding, and J-STD-002 solderability

Pinout & Package

DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, cathode band indicating terminal polarity, weight ≈ 0.060 g. Complies with JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction path	Connected to system ground or low-side return; conducts during forward surge events
Cathode (marked)	Reverse-biased clamping node	Connected to protected line (e.g., 110V rail); initiates avalanche breakdown when V_IN exceeds V_BR

Key Features

Feature	Design Value
Glass passivated junction	Enables stable V_BR tolerance and long-term reliability under repeated transient stress
Fast response time <1.0 ps	Clamps ESD and fast-edge transients before sensitive ICs experience overvoltage damage
ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance	Validated for automotive power-line immunity testing without external filtering augmentation
RoHS & halogen-free (IEC 61249-2-21)	Meets global environmental regulations for PCB assembly and end-of-life disposal

Applications

Switching Mode Power Supply (SMPS)	On-board DC/DC Converter
Use Scenario: Input stage protection against load dump and back-EMF spikes on 110V primary rails. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between input bus and ground. Use Value: Limits transient voltage to ≤177V, preventing MOSFET gate oxide rupture and controller latch-up.	Use Scenario: Protection of isolated 110V-to-12V converter inputs in railway or industrial control cabinets. IC Role / Device Role / Timing Role: Standoff-rated surge absorber on primary-side HV rail prior to transformer input. Use Value: Maintains <1 μA leakage at 110V, avoiding bias current errors in precision feedback networks.
Automotive Lighting Module	Industrial Adapter Interface
Use Scenario: Surge suppression on 110V LED driver inputs exposed to battery line transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on constant-current driver supply line. Use Value: Withstands 400W pulses without degradation, supporting >100,000 surge cycles per AEC-Q200 guidance.	Use Scenario: Input protection for universal-input 110V AC/DC adapters used in factory automation equipment. IC Role / Device Role / Timing Role: First-line defense against mains-borne surges entering secondary-side regulation circuitry. Use Value: DO-214AC footprint enables automated placement and reflow compatibility with IPC-A-610 Class 3 standards.

Switching Mode Power Supply (SMPS)

On-board DC/DC Converter

Use Scenario: Input stage protection against load dump and back-EMF spikes on 110V primary rails.

IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between input bus and ground.

Use Value: Limits transient voltage to ≤177V, preventing MOSFET gate oxide rupture and controller latch-up.

Use Scenario: Protection of isolated 110V-to-12V converter inputs in railway or industrial control cabinets.

IC Role / Device Role / Timing Role: Standoff-rated surge absorber on primary-side HV rail prior to transformer input.

Use Value: Maintains <1 μA leakage at 110V, avoiding bias current errors in precision feedback networks.

Automotive Lighting Module

Industrial Adapter Interface

Use Scenario: Surge suppression on 110V LED driver inputs exposed to battery line transients.

IC Role / Device Role / Timing Role: Primary overvoltage clamp on constant-current driver supply line.

Use Value: Withstands 400W pulses without degradation, supporting >100,000 surge cycles per AEC-Q200 guidance.

Use Scenario: Input protection for universal-input 110V AC/DC adapters used in factory automation equipment.

IC Role / Device Role / Timing Role: First-line defense against mains-borne surges entering secondary-side regulation circuitry.

Use Value: DO-214AC footprint enables automated placement and reflow compatibility with IPC-A-610 Class 3 standards.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ110	V_BR min = 122 V, V_BR max = 149 V; V_C = 196 V - higher clamping voltage than SMAJ110A	Less stringent clamping margin for 110V systems with tight downstream voltage tolerances	Select SMAJ110A when V_C ≤ 177 V is required to protect 200V-rated capacitors or 175V MOSFETs
SMBJ110A	Same V_WM/V_BR/V_C specs but in larger DO-214AA (SMB) package - higher thermal mass and 600W P_PK	Preferred where board space allows and higher surge repetition rate or ambient temperature >85°C is expected	Choose SMAJ110A for space-constrained layouts needing DO-214AC footprint and 400W rating

Compared with SMAJ110 and SMBJ110A, the SMAJ110A offers the tightest V_BR range (122–135 V) and lowest clamping (177 V) in the smallest DO-214AC package, making it optimal for compact 110V rail protection where thermal budget and layout area are constrained.

Availability

SMAJ110A is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and automotive lighting modules requiring stable component supply across extended production lifecycles.

Supply support for SMAJ110A 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, serving industrial, automotive, and consumer markets since 1979.

The SMAJ series is part of TSC's transient voltage suppression portfolio, engineered specifically for robust, high-reliability protection of 5V–188V DC power rails against ISO 7637-2 and IEC 61000-4-5 threats.

FAQ

What is the maximum clamping voltage of the SMAJ110A under a 10/1000μs surge?

The SMAJ110A has a maximum clamping voltage (V_C) of 177 V when subjected to its rated 400W peak pulse power with a 10/1000μs waveform. This value is measured at the peak impulse current (I_PPM) specified in the datasheet and defines the upper voltage limit imposed on protected circuitry during transient events.

Is the SMAJ110A unidirectional or bidirectional, and how is polarity indicated?

The SMAJ110A is a unidirectional TVS diode. Polarity is indicated by a cathode band on the DO-214AC (SMA) package body - the banded end connects to the protected line (e.g., 110V rail), while the unbanded end connects to ground. Bidirectional variants use "CA" suffixes (e.g., SMAJ110CA).

Does the SMAJ110A meet automotive transient immunity standards?

Yes, the SMAJ110A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements for 12V and 24V automotive electrical systems. Its 400W peak pulse rating and fast response ensure effective suppression of load dump, inductive switching, and coupling-induced transients without external circuitry.

What is the reverse leakage current specification for the SMAJ110A at its working voltage?

At its working stand-off voltage (V_WM) of 110 V and TA = 25°C, the SMAJ110A exhibits a maximum reverse leakage current (I_R) of 1 μA. This ultra-low leakage preserves efficiency in high-impedance monitoring paths and avoids false triggering in precision sensing circuits.

Can the SMAJ110A be used in place of the SMAJ110, and what is the key difference?

Yes, the SMAJ110A can replace the SMAJ110 in most designs, but with improved clamping performance: SMAJ110A has V_C = 177 V versus SMAJ110's V_C = 196 V. The tighter V_BR range (122–135 V vs. 122–149 V) also yields more predictable turn-on behavior, making SMAJ110A preferable for margin-critical 110V protection.

SMAJ110A Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Package/Case:: DO-214AC, SMA

Series:: SMAJ

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Zener

Unidirectional Channels:: 1

Bidirectional Channels:: -

Voltage - Reverse Standoff (Typ):: 110V

Voltage - Breakdown (Min):: 122V

Voltage - Clamping (Max) @ Ipp:: 177V

Current - Peak Pulse (10/1000µs):: 1.7A

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)

SMAJ110A FAQ

1.How can I place an order for SMAJ110A through Aetrix?

Please submit a Request for Quotation (RFQ) for SMAJ110A 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 SMAJ110A reliable?

The price and inventory of SMAJ110A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ110A is usually 5 days.

3.What payment methods are accepted for SMAJ110A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ110A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMAJ110A?

SMAJ110A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMAJ110A 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 SMAJ110A?

For technical support, including SMAJ110A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ110A requirements.

6.How does Aetrix verify that SMAJ110A is sourced from the original manufacturer or authorized distributors?

All SMAJ110A 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 SMAJ110A meets industry standards.

7.What is the process for return or replacement of SMAJ110A?

All SMAJ110A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ110A, 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 SMAJ110A part is unused and in its original packaging.

Return procedure for SMAJ110A:

1.Submit a request within 90 days.

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

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