The BTA26 is a 25A TRIAC designed for general-purpose AC power switching applications, offering reliable bidirectional control of mains-powered loads. It features low thermal resistance through clip-bonding technology, high commutation capability, and is available in both through-hole and surface-mount packages for flexible system integration. This TRIAC is widely used in motor controls, lighting dimmers, heating controllers, industrial automation, and household appliances.

Part Number: BTA26

Function: 25A, TRIACS

Package: TOP3 Pin Type

Manufacturer: ST Microelectronics

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Description

This is 25A, Triacs. Available either in through-hole or surface-mount packages, the BTA24, BTB24, BTA25, BTA26, BTB26 and T25 triac series is suitable for general purpose mains power AC switching.

A TRIAC, short for “triode for alternating current,” is a type of electronic component that acts as a bidirectional switch for controlling AC (alternating current) power. It’s often used for controlling the intensity of lamps, the speed of AC motors, and other applications where precise control of AC power is needed.

Features

1. High current triac

2. Low thermal resistance with clip bonding

3. High commutation (4 quadrant) or very high commutation (3 quadrant) capability

4. BTA series UL1557 certified (File ref: 81734)

5. Packages are RoHS (2002/95/EC) compliant

Characteristics

How to Choose This Part

• Select for AC switching applications requiring up to 25A RMS load current
• Choose the appropriate voltage rating based on the mains supply voltage
• Suitable for both resistive and inductive load control
• Use BTA versions when an insulated mounting tab is preferred
• Verify thermal management meets the expected power dissipation requirements

Applications

Applications include the ON/OFF function in applications such as static relays, heating regulation, induction motor starting circuits, etc., or for phase control operation in light dimmers,
motor speed controllers, and silmilar.

The snubberless versions (BTA/BTB…W and T25 series) are especially recommended for use on
inductive loads, due to their high commutation performances. The BTA series provides an
insulated tab (rated at 2500 VRMS).

Alternative / Equivalent Products

• BTA24
• BTA25
• BTB24
• BTB26
• T25 Series
• Q6025L6

BTA26 PDF Datasheet

The Z3M belongs to the Z01 series of TRIACs, designed for low-power AC switching and phase control applications. It is particularly suitable for direct interfacing with logic-level control circuits, including microcontrollers, due to its relatively low gate trigger current.

Function: Triac, 600V 1A, Sensitivity 3mA

Package: SOT-223, SMBflat-3L Type

Manufacturer: STMicroelectronics

See the preview image and the PDF file for more information.

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Z0103MN, Z0103MUF is marked Z3M

Description

The Z01 series is suitable for general purpose AC switching applications. These devices are typically used in applications such as home appliances (electrovalve, pump, door lock, small lamp control), fan speed controllers,… Different gate current sensitivities are available, allowing optimized performance when driven directly through microcontrollers.

Key Features

• Bidirectional AC switch (TRIAC)
• High blocking voltage: 600V
• On-state RMS current: 1A
• Low gate trigger current (sensitive gate type)
• Suitable for direct MCU drive (with proper resistor network)
• Compact package (commonly TO-92 or SOT-223 depending on variant)

Ordering Information

Z3M Features

1. On-state rms current, IT(RMS) 1 A

2. Repetitive peak off-state voltage, VDRM/VRRM 600 or 800 V

3. Triggering gate current, IGT (Q1)3 to 25 mA

Design Considerations

• Gate Drive: Can be driven directly by MCU GPIO via resistor (ensure I_GT is met)
• Isolation: Use opto-triac (e.g., MOC30xx) for safety in mains applications
• Snubber Network: RC snubber (e.g., 100Ω + 100nF) recommended for inductive loads
• dV/dt Sensitivity: High dV/dt may cause false triggering → snubber or proper layout required
• Thermal: Limited to low-power loads (~100–200W typical depending on cooling)

Selection Guidance

• Use Z3M for low-current AC loads (<1A)
• Choose higher current TRIAC (e.g., BT136, BTA16) for heavier loads
• Select sensitive gate versions for direct MCU interfacing
• Ensure adequate voltage margin for mains (600V suitable for 220VAC systems)

Alternative / Equivalent Parts

• Z0103 / Z0107 series
• BT131 (1A class TRIAC)
• MAC97A6
• BT136 (higher current alternative)

Typical Applications

• Home appliance control (electrovalves, pumps, door locks)
• Small lamp dimmers
• Fan speed controllers
• Heater control (low power)
• AC load switching via MCU

Z3M Datasheet