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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics AVS12CB

Name: AVS12CB
Brand: STMicroelectronics
SKU: AVS12CB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AVS12CB

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-220-3

Datasheet:: AVS12CB.pdf

Description:: TRIAC INT TRIGGER 600V 12A TO220

Quantity:: RFQ Add To RFQ list

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Inventory:419

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Product details

Overview

AVS12CB from STMicroelectronics is a 12A, ±600V RMS TRIAC in TO-220AB package, designed as the power-switching element of an automatic 110/220V AC mains selector for SMPS < 500W. It operates with integrated zero-crossing detection, delivers 105A non-repetitive surge current (8.3ms), and features 2.3°C/W AC thermal resistance at 50Hz conduction for direct heatsink mounting in universal-input offline power supplies.

For engineers reviewing the AVS12CB datasheet, AVS12CB pinout, AVS12CB application, or AVS12CB equivalent, this part is selected for high-immunity AC voltage switching where dynamic gate sensitivity, low I²t stress during surges, and stable conduction under varying line conditions are critical to avoid output overvoltage during mode transitions.

Technical Context

The AVS12CB functions as the main bidirectional AC switch in a two-device automatic voltage selection system, paired with controller AVS1ACP08. Its gate is optimized for low-trigger-current compatibility with the controller's pulse-train output, enabling precise zero-crossing turn-on while minimizing supply resistor losses.

It supports full 50/60Hz operation with 20A/µs critical dI/dt rating and 50V/µs dV/dt immunity at Tj = 110°C. The device uses a standard A1–A2–G terminal configuration and requires no external snubber under typical 110/220V switching waveforms when used with the designated controller.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DRM	±600 V - Blocks full mains transients up to 600V peak in either polarity without false triggering
I_T(RMS)	12 A at T_C = 70°C - Sustains continuous load current for 500W SMPS with margin at 220V input
I_TSM	105 A (8.3ms) - Withstands IEC 61000-4-5 surge events without latch-up or degradation
dI/dt (crit)	20 A/µs (repetitive) - Ensures reliable turn-on even with fast-rising inrush currents from bulk capacitors
R_th(j-c) AC	2.3 °C/W - Enables direct mounting to heatsink with ≤27°C temperature rise at 12A RMS
V_TM	1.75 V at 17A, 10ms - Limits conduction loss to <21W at full RMS current, reducing thermal design burden
I²t	50 A²s (10ms) - Defines fusing limit for coordination with upstream fuse selection in safety-certified designs

Pinout & Package

AVS12CB is housed in a TO-220AB plastic package with isolated tab (electrically connected to A2), rated for 2.3°C/W thermal resistance under 360° conduction at 50Hz. Mounting requires 0.8 m·N recommended torque and compatible insulating hardware.

Pin/Terminal	Circuit Role	Design Meaning
A1	Main Terminal 1	AC line input reference node; tied to neutral or phase depending on board layout and controller logic
A2	Main Terminal 2	Electrically connected to heatsink tab; serves as common return path for load current and gate drive reference
G	Gate	Low-threshold, high-dI/dt-sensitive control input; triggered by AVS1ACP08's zero-crossing synchronized pulse train

Key Features

Feature	Design Value
Optimized gate sensitivity	Enables reliable triggering with <10mA peak gate current from AVS1ACP08, reducing power loss in series resistor
High dV/dt immunity	50 V/µs at T_j = 110°C prevents false turn-on during line transients or EMI coupling
Low on-state voltage	V_TM = 1.75 V limits conduction loss to ≤21W at 12A RMS, easing thermal management
Robust surge rating	105A (8.3ms) non-repetitive surge withstand supports EN 61000-4-5 compliance without external crowbar

Applications

Universal Input SMPS

Industrial AC-DC Power Modules

Use Scenario: Offline switch-mode power supply accepting 110V or 220V AC mains without manual selector switch.

IC Role / Device Role / Timing Role: TRIAC acts as automatic AC input polarity and voltage range selector, commutated only at zero-crossing to minimize EMI and stress.

Use Value: Eliminates need for dual-winding transformers or relay-based auto-ranging, reducing BOM cost and failure modes.

Use Scenario: Fixed-output 24V/48V industrial power module deployed globally across mixed-voltage facilities.

IC Role / Device Role / Timing Role: Main AC switching element controlled by dedicated voltage-sense IC to maintain stable DC bus during line dips or surges.

Use Value: Prevents destructive voltage spikes during 220V restoration after brownout, per AVS1ACP08 lock-mode behavior.

Medical Equipment Power Inputs

Test & Measurement Instrumentation

Use Scenario: Mains-powered diagnostic devices requiring CE/UL-compliant universal input with no user intervention.

IC Role / Device Role / Timing Role: Bidirectional AC switch enabling automatic adaptation to local grid voltage while maintaining isolation integrity.

Use Value: Meets IEC 60601-1 creepage/clearance requirements via TO-220AB insulated tab and controlled turn-on timing.

Use Scenario: Bench power supplies and signal generators needing stable internal rail generation across lab environments with variable line quality.

IC Role / Device Role / Timing Role: High-immunity TRIAC ensuring clean switching despite harmonic-rich or distorted mains waveforms.

Use Value: Maintains regulation accuracy by preventing misfiring during zero-crossing distortion caused by nonlinear loads.

Equivalent & Alternatives

The following parts are listed as comparable options for similar automatic AC voltage switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BTB12-600CW	Higher I_T(RMS) (16A), but no integrated zero-crossing optimization; requires external sync circuit	Lacks built-in compatibility with AVS1ACP08 controller timing and hysteresis thresholds	Use only if redesigning controller interface and adding zero-crossing detection circuitry
Q6012LH4	Same 12A/600V rating, but lower dV/dt immunity (25 V/µs) and no specified I²t rating	Not validated for lock-mode behavior during voltage recovery; higher risk of overvoltage stress	Suitable for basic on/off switching, not for automatic mains selection with safety-critical recovery behavior

Compared with BTB12-600CW and Q6012LH4, AVS12CB provides verified gate timing alignment with AVS1ACP08, guaranteed lock-mode operation during 220V restoration, and documented I²t/surge coordination-critical for certified universal-input SMPS designs.

Availability

AVS12CB is available at Aetrix Electronics and suitable for universal-input SMPS, industrial AC-DC modules, medical equipment power inputs, and test instrumentation requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for AVS12CB 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, delivering analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer applications.

AVS12CB belongs to ST's Automatic Voltage Switch (AVS) product line, engineered specifically for safe, self-configuring AC mains selection in offline power conversion systems up to 500W.

FAQ

Is AVS12CB compatible with controllers other than AVS1ACP08?

No. AVS12CB's gate sensitivity and dynamic parameters are co-optimized with AVS1ACP08's pulse-train output and zero-crossing hysteresis. Using alternate controllers risks misfiring, excessive gate dissipation, or failure to maintain lock-mode behavior during voltage transitions.

What is the maximum allowable case temperature for continuous 12A operation?

At 12A RMS and 50Hz conduction, the maximum case temperature is 70°C, derived from R_th(j-c) AC = 2.3°C/W and max T_j = 125°C. Exceeding 70°C case temperature violates the absolute maximum rating and risks thermal runaway.

Does AVS12CB require a heatsink in all applications?

Yes. Even at 12A RMS, junction-to-case thermal resistance alone cannot dissipate >21W continuously without exceeding T_j limits. A properly sized heatsink maintaining T_C ≤ 70°C is mandatory for reliability and safety certification.

Can AVS12CB be used in DC switching applications?

No. AVS12CB is a quadrants I/III TRIAC designed exclusively for AC line-frequency commutation. It lacks DC holding current specification and will not sustain conduction in DC circuits, leading to uncontrolled turn-off and potential failure.

AVS12CB Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Active

Triac Type:: Internally Triggered

Voltage - Off State:: 600 V

Current - On State (It (RMS)) (Max):: 12 A

Voltage - Gate Trigger (Vgt) (Max):: -

Current - Non Rep. Surge 50, 60Hz (Itsm):: 100A, 105A

Current - Gate Trigger (Igt) (Max):: -

Current - Hold (Ih) (Max):: -

Configuration:: Single

Operating Temperature:: 0°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

AVS12CB FAQ

1.How can I place an order for AVS12CB through Aetrix?

Please submit a Request for Quotation (RFQ) for AVS12CB 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 AVS12CB reliable?

The price and inventory of AVS12CB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AVS12CB is usually 5 days.

3.What payment methods are accepted for AVS12CB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AVS12CB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AVS12CB?

AVS12CB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AVS12CB 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 AVS12CB?

For technical support, including AVS12CB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AVS12CB requirements.

6.How does Aetrix verify that AVS12CB is sourced from the original manufacturer or authorized distributors?

All AVS12CB 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 AVS12CB meets industry standards.

7.What is the process for return or replacement of AVS12CB?

All AVS12CB units undergo pre-shipment inspection (PSI). If there is an issue with AVS12CB, 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 AVS12CB part is unused and in its original packaging.

Return procedure for AVS12CB:

1.Submit a request within 90 days.

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

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