A22105-134-12 Allen-Bradley

A22105-134-12 Allen-Bradley Power Board

Brand：Allen-Bradley Model number：A22105-134-12

Country of origin: United States Product weight：0.55kg

HS code：8517623990

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This module serves as a high-current switching device designed for heavy-duty industrial power conversion. As a Darlington pair, it integrates two bipolar transistors where the emitter of the first is connected to the base of the second. This configuration provides a very high current gain, allowing a relatively small base current to switch or amplify much larger collector currents. The A22105-134-12 is engineered for high thermal efficiency and is typically mounted on a large heatsink to manage the heat generated during high-frequency switching operations in motor drives.

Product Parameters

While specific data sheets for legacy part numbers can vary based on the original equipment manufacturer (OEM) revision, the standard technical profile for this class of module includes:

Type: Dual Darlington Transistor Module with Integrated Fast Recovery Diode.
Collector-Emitter Voltage ( $V_{CEX}$ ): Typically rated up to $600\text{V}$ or $1000\text{V}$ , depending on the specific drive application.
Collector Current ( $I_C$ ): High-capacity rating, often reaching $100\text{A}$ to $200\text{A}$ continuous, designed for driving heavy industrial motors.
Configuration: Often found in a "half-bridge" or "dual" layout within a single housing.
Isolation Voltage: Rated for high dielectric strength (often $2500\text{V}$ AC) between the internal circuitry and the base plate to ensure safety and prevent grounding issues.
Mounting: Screw-terminal interface for power connections and a metal base plate for thermal dissipation.

Product Advantages

High Current Gain: The Darlington configuration allows the module to control massive electrical loads with minimal input power, making it an efficient bridge between low-voltage control logic and high-voltage power outputs.
Thermal Reliability: Built with a specialized ceramic substrate that provides excellent electrical insulation while maximizing heat transfer to the external cooling system.
Integrated Protection: Most versions include a built-in "free-wheeling" or anti-parallel diode to protect the transistors from inductive voltage spikes (back EMF) generated by motors.
Legacy Compatibility: As an authentic Allen-Bradley part, it ensures exact physical fit and electrical matching for the maintenance and repair of existing 1336-series drive infrastructure, avoiding the need for costly system-wide upgrades.

Important Considerations and Precautions

Electrostatic Discharge (ESD): This is a sensitive semiconductor device. Always use grounded wrist straps and ESD-safe handling procedures to prevent internal gate damage.
Thermal Management: Never operate the module without a properly applied thermal interface material (like silicone-based thermal grease) and a securely fastened heatsink. Overheating will lead to immediate catastrophic failure.
Torque Specifications: Use a torque wrench to tighten power terminals and mounting screws. Over-tightening can crack the ceramic substrate, while under-tightening leads to high resistance and localized melting.
Voltage Verification: Ensure the DC bus capacitors of the drive are fully discharged before installation. Residual energy in the power section can be lethal and can destroy the new module instantly.
Obsolescence: This is a legacy component. Users should verify the condition (New Old Stock vs. Refurbished) and ensure that the drive's firing circuit is still functional before replacing the power module.

Product Applications

The A22105-134-12 is primarily used in the power conversion stages of industrial equipment including:

Variable Frequency Drives (VFDs): Specifically within the inverter section of Allen-Bradley 1336 Classic, 1336 Plus, and 1336 Force drives to control motor speed and torque.
Uninterruptible Power Supplies (UPS): Used in high-power industrial UPS systems for DC-to-AC inversion.
Large DC Motor Drives: Employed in phase-controlled or PWM-based controllers for large DC machinery.
Heavy Industry Machinery: Found in applications such as paper mills, steel processing, and large-scale pumping stations where high-power motor control is required.

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