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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics AVS08CBI

Name: AVS08CBI
Brand: STMicroelectronics
SKU: AVS08CBI
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AVS08CBI

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-220-3

Datasheet:: AVS08CBI.pdf

Description:: TRIAC INT TRIGGER 500V 5A TO220

Quantity:: RFQ Add To RFQ list

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Inventory:4,666

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Product details

Overview

AVS08CBI from STMicroelectronics is an insulated automatic voltage switch triac rated for 500 V repetitive peak off-state voltage and 5 A RMS on-state current at 95°C case temperature, designed for mains input voltage selection (110/220 V AC) in SMPS < 200 W. It integrates high immunity zero-crossing detection, parasitic filtering, and optimized gate triggering to prevent voltage spikes during mode transitions.

For engineers reviewing the AVS08CBI datasheet, AVS08CBI pinout, AVS08CBI application, or AVS08CBI equivalent, this part supports reliable dual-voltage AC input handling with built-in thermal derating, 2500 V_RMS insulation, and precise hysteresis-controlled peak voltage detection - critical for industrial power supply design and global-input adapter safety compliance.

Technical Context

The AVS08CBI operates as the power-switching element in a two-device automatic voltage selector system, paired with controller AVS1BCP08. Its gate sensitivity and dynamic parameters are co-optimized to minimize supply resistor losses while maintaining robust noise immunity against line disturbances.

It features 2500 V_RMS isolation between main terminals and heatsink-mounting surface, enabling safe operation in non-insulated chassis designs. Thermal resistance R_th(j–c) is 4.7 °C/W under 360° conduction at 50 Hz, supporting stable 5 A RMS switching without forced cooling in compact enclosures.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DRM	±500 V - Withstands repetitive peak line transients up to 500 V in either polarity without conduction.
I_T(RMS)	5 A at T_C = 95°C - Sustains continuous mains current for 200 W SMPS with standard heatsinking.
I_TSM	65 A (10 ms) - Handles short-duration surges such as cold-start inrush without latch-up.
dI/dt (repetitive)	20 A/µs - Ensures reliable turn-on under fast-rising load currents without false triggering.
R_th(j–c) (AC)	4.7 °C/W - Enables thermal design with ≤22°C temperature rise above case at full 5 A RMS load.
V_TM	1.65 V @ 7 A, 10 ms - Low on-state voltage drop minimizes conduction loss and heatsink requirements.
I_DRM	10 µA @ V_DRM - Confirms low leakage in blocking state, critical for standby power integrity.

Pinout & Package

AVS08CBI is housed in a TO-220AB plastic package with insulated mounting base (2500 V_RMS isolation), intended for direct heatsink mounting without additional insulating hardware.

Pin/Terminal	Circuit Role	Design Meaning
A1	Main Terminal 1	Reference terminal for gate trigger; connected to neutral or low-side return path in voltage selector topology.
A2	Main Terminal 2	High-side AC input terminal; carries full mains current during conduction.
G	Gate	Control input accepting low-energy triggering pulses from AVS1BCP08; optimized for minimal I_GT and high dI/dt immunity.

Key Features

Feature	Design Value
2500 V_RMS insulation	Eliminates need for separate insulating washers or pads when mounted to grounded heatsinks.
Optimized gate sensitivity	Reduces required gate drive energy by >30% vs. generic triacs, lowering losses in series supply resistors.
High dI/dt immunity (20 A/µs)	Prevents false triggering from EMI or fast line transients in noisy industrial environments.
Low V_TM (1.65 V)	Limits conduction loss to <8.3 W at 5 A RMS, easing thermal management in space-constrained adapters.
Rated for 50/60 Hz full compatibility	Validated performance across global AC line frequencies without timing or stability compromise.

Applications

Universal Input SMPS

Industrial AC-DC Adapters

Use Scenario: Mains-powered 12 V/5 A DC output supply used in factory automation controllers requiring automatic 110/220 V AC selection.

IC Role / Device Role / Timing Role: Triac-based voltage selector that physically routes AC input to appropriate rectifier configuration based on detected line voltage.

Use Value: Eliminates manual voltage selector switches and prevents damage from incorrect setting, ensuring single-BOM deployment worldwide.

Use Scenario: DIN-rail mounted 24 V/3 A power module for PLC I/O modules operating in mixed-voltage facilities.

IC Role / Device Role / Timing Role: High-reliability AC switching element enabling seamless transition between 110 V and 220 V utility feeds without interruption.

Use Value: Maintains uninterrupted operation during grid voltage fluctuations, supported by locked-mode behavior preventing spike generation on restoration.

Medical Equipment Power Inputs

Test & Measurement Instrumentation

Use Scenario: Benchtop ECG analyzer with CE/FCC certification requiring double-insulated AC input stage.

IC Role / Device Role / Timing Role: Isolated mains switch providing reinforced insulation barrier between line and internal circuitry.

Use Value: Meets 2500 V_RMS creepage/clearance requirements per IEC 60601-1 without auxiliary isolation components.

Use Scenario: Portable oscilloscope with auto-ranging AC input powering internal analog front-end and digital subsystems.

IC Role / Device Role / Timing Role: Voltage-sensing controlled triac enabling adaptive input conditioning before bridge rectification.

Use Value: Reduces standby power consumption by >40% versus fixed-input designs via intelligent mode retention during brownouts.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BTB16-600BW	Non-insulated TO-220 package; no 2500 V_RMS isolation; higher I_T(RMS) (16 A) but unoptimized gate for AVS control logic.	Requires external isolation hardware; lacks integrated zero-crossing coordination with controller IC.	Select only if board-level insulation is already implemented and higher current headroom is needed.
Q6016LH4	600 V V_DRM, 16 A rating, sensitive gate, but no specified dI/dt immunity or hysteresis-tuned detection thresholds.	Not validated for coordinated operation with AVS1BCP08; requires custom gate drive tuning.	Use only in new designs where full system requalification is feasible and controller co-design is not required.

Compared with BTB16-600BW and Q6016LH4, AVS08CBI delivers verified interoperability with AVS1BCP08, guaranteed 2500 V_RMS insulation, and application-specific gate dynamics - reducing validation effort and improving surge resilience in certified power supplies.

Availability

AVS08CBI is available at Aetrix Electronics and suitable for universal-input SMPS, industrial AC-DC adapters, medical equipment power inputs, and test & measurement instrumentation requiring stable component supply and long-term lifecycle support.

Supply support for AVS08CBI 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, Switzerland, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

AVS08CBI belongs to ST's Automatic Voltage Switch (AVS) product line, engineered specifically for safe, self-configuring AC input selection in offline switch-mode power supplies up to 200 W.

FAQ

What is the maximum allowable case temperature for continuous 5 A RMS operation?

The AVS08CBI is rated for 5 A RMS conduction at T_C = 95°C. Exceeding this temperature requires derating per the I_T(RMS) vs. T_C curve in the datasheet. At 100°C case temperature, maximum sustainable current drops to approximately 4.6 A RMS due to thermal limits of the silicon and package construction.

Does AVS08CBI require a heatsink when used at full rated current?

Yes - a heatsink is mandatory. With R_th(j–c) = 4.7 °C/W and typical power dissipation of ~8.3 W at 5 A RMS, junction temperature rise would exceed 125°C without heatsinking. A minimum 10 cm² aluminum heatsink (natural convection) is recommended to maintain T_j ≤ 125°C at ambient ≤ 50°C.

Can AVS08CBI be used without the AVS1BCP08 controller?

No - AVS08CBI is not a standalone triac for general-purpose switching. Its gate characteristics, sensitivity, and transient immunity are co-optimized exclusively for use with AVS1BCP08. Direct microcontroller or optocoupler drive is unsupported and risks unreliable triggering or premature failure.

How does the 2500 V_RMS insulation rating impact PCB layout?

The 2500 V_RMS rating applies between main terminals (A1/A2) and the isolated mounting base. PCB layout must maintain ≥4.5 mm creepage and clearance from A1/A2 traces to any grounded copper plane or heatsink contact area. No additional insulating hardware is needed when mounting directly to a grounded heatsink.

AVS08CBI Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Triac Type:: Internally Triggered

Voltage - Off State:: 500 V

Current - On State (It (RMS)) (Max):: 5 A

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

Current - Non Rep. Surge 50, 60Hz (Itsm):: 65A, 70A

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

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

Configuration:: Single

Operating Temperature:: -10°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

AVS08CBI FAQ

1.How can I place an order for AVS08CBI through Aetrix?

Please submit a Request for Quotation (RFQ) for AVS08CBI 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 AVS08CBI reliable?

The price and inventory of AVS08CBI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AVS08CBI is usually 5 days.

3.What payment methods are accepted for AVS08CBI?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AVS08CBI transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AVS08CBI?

AVS08CBI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AVS08CBI 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 AVS08CBI?

For technical support, including AVS08CBI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AVS08CBI requirements.

6.How does Aetrix verify that AVS08CBI is sourced from the original manufacturer or authorized distributors?

All AVS08CBI 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 AVS08CBI meets industry standards.

7.What is the process for return or replacement of AVS08CBI?

All AVS08CBI units undergo pre-shipment inspection (PSI). If there is an issue with AVS08CBI, 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 AVS08CBI part is unused and in its original packaging.

Return procedure for AVS08CBI:

1.Submit a request within 90 days.

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

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