The Rohm FMA7A is an array of two NPN Bipolar Junction Transistors (BJTs) with integrated biasing resistors. This configuration, often referred to as a digital transistor or resistor-equipped transistor (RET), simplifies circuit design by eliminating the need for external base resistors. It's primarily used in switching applications where a defined input current controls the output state.

Applications

• Switching circuits.
• Inverter circuits.
• Driver circuits for LEDs, relays, and other loads.
• Digital logic circuits.
• General-purpose amplification.

Features

• Two NPN BJTs in a single package.
• Integrated biasing resistors.
• Low saturation voltage.
• Small surface mount package.
• Reduces component count and board space.

Benefits

• Simplifies circuit design by eliminating external resistors.
• Reduces component count and board space.
• Improves circuit reliability.
• Reduces assembly costs.
• Provides a well-defined input impedance.

Additional Details

The FMA7A typically comes in a SOT-363 or similar small outline transistor package. The integrated resistors define the input current required to turn the transistor on. This makes it easy to interface with digital logic circuits. The specific resistor values are critical parameters and should be consulted in the datasheet. The datasheet also specifies the saturation voltage (VCE(sat)), which is the voltage drop across the collector-emitter junction when the transistor is fully turned on.

For precise application and design, refer to the Rohm Semiconductor datasheet for the FMA7A. It provides detailed specifications, including resistor values, DC characteristics, and thermal considerations.