Infineon SMBT2907A PNP Bipolar Junction Transistor: Datasheet, Application Circuit, and Replacement Guide
The Infineon SMBT2907A is a high-performance PNP bipolar junction transistor (BJT) packaged in a space-saving SOT-23 surface-mount device (SMD). It is designed for high-speed switching and amplification applications, making it a popular choice in modern electronic design where efficiency and board space are critical.
Datasheet Overview and Key Specifications
The SMBT2907A is characterized by its high current gain and low saturation voltage, which are essential for efficient switching. Key absolute maximum ratings include a collector-emitter voltage (VCE) of -60V and a collector current (IC) of -600mA. Its high transition frequency (fT) of 200 MHz allows it to operate effectively in high-frequency circuits. The device is housed in a SOT-23 package, making it suitable for compact consumer electronics, power management modules, and interface circuits.
Typical Application Circuit
A common use for the SMBT2907A is as a switch or an amplifier. In a simple switching circuit, it can control a load such as a relay, LED, or motor. The base is driven through a current-limiting resistor (typically 1kΩ to 10kΩ). When a small current is applied to the base, the transistor allows a much larger current to flow from the emitter to the collector, turning on the load. For amplification, it is typically biased in the active region using a voltage divider network at the base to set the operating point (Q-point), enabling it to amplify small AC signals.
Replacement and Cross-Reference Guide
When the SMBT2907A is unavailable, suitable replacements must match its key parameters. Direct functional equivalents include the ON Semiconductor MMBT2907A and the Diodes Incorporated MMBT2907A. Always verify the pinout (Emitter-Base-Collector) is identical, as some manufacturers may have variations. For circuits requiring higher current handling, a PNP transistor in a SOT-223 package (e.g., BD140) could be considered, though it requires more board space. Critical parameters to match during replacement are VCEO, IC, hFE, and fT.
ICGOODFIND: The Infineon SMBT2907A is a robust and versatile PNP BJT ideal for switching and amplification in space-constrained designs. Its excellent electrical characteristics and SMD package make it a go-to component for modern electronics. When replacing, always cross-check the datasheet to ensure compatibility with your circuit's voltage, current, and frequency requirements.
Keywords: PNP Transistor, SOT-23, High-Speed Switching, Current Gain, Cross-Reference
