FMC3AT148

Overview

The FMC3AT148 is a dual pre-biased bipolar junction transistor (BJT) array manufactured by ROHM Semiconductor. It integrates one NPN and one PNP transistor within a compact SMT-5 surface-mount package, equivalent to the SC-74A form factor. The device features a maximum collector-emitter voltage of 50V and a continuous collector current rating of 100mA for both polarities. Internal base resistors are specified at 10k Ohms. Key electrical parameters include a minimum DC current gain (hfe) of 68 at 1mA and 5V, a power dissipation capacity of 300mW, and a maximum operating frequency of 250MHz. The component supports an operating temperature range from -55°C to +150°C.

Feature Summary

• Integrates complementary NPN and PNP transistors in a single ultra-small surface-mount package
• Includes internal base biasing resistors to simplify circuit design and reduce component count
• Supports high-frequency operation with a maximum transition frequency of 250MHz
• Rated for extended industrial temperature ranges up to +150°C

Applications

• Differential amplifier circuits requiring matched complementary pairs
• High-frequency oscillator starter stages
• Logic level translation interfaces
• Switching applications in portable electronic devices

Procurement Notes

Verify the specific datasheet revision and RoHS compliance status directly with ROHM Semiconductor or authorized distributors before finalizing procurement. Confirm that the SMT-5 package dimensions align with the target PCB footprint. Ensure that the thermal management strategy accounts for the 300mW power dissipation limit under worst-case operating conditions to maintain reliability within the specified temperature range.

Selection Notes

Select the FMC3AT148 when a compact solution for complementary switching or amplification is required. The integrated 10k Ohm base resistors eliminate external biasing components, reducing board space. Consider this part for designs needing 50V breakdown and 100mA current handling in a small footprint. Verify that the 250MHz frequency response meets the signal requirements. Compare against single-transistor alternatives if higher individual performance metrics are needed.

Part Context

This component belongs to the FMC3A series of complex digital transistors offered by ROHM Semiconductor. These devices are designed to replace multiple discrete components, simplifying assembly and improving consistency. The FMC3AT148 specifically addresses applications requiring both NPN and PNP functions in a minimal profile, commonly used in consumer electronics and industrial control systems where space constraints are critical.

Replacement Considerations

Public documentation indicates the DTA143T as an equivalent single-part reference for comparison. However, the FMC3AT148 contains two distinct transistors (NPN/PNP), whereas the DTA143T is typically a single PNP unit. Direct substitution requires verifying circuit topology compatibility. No other specific dual-substitute part numbers are confirmed in the provided source material.