L603C

Overview

The L603C is a high-voltage, high-current Darlington array from STMicroelectronics. It integrates eight NPN Darlington pairs with common emitters in an open-collector configuration. The device features a collector-emitter voltage of 90V and supports a continuous DC collector current of 400mA, with a peak capability up to 500mA. Power dissipation is rated at 1.8W. It utilizes a 18-pin PDIP through-hole package and operates within a temperature range of -25°C to positive limits.

Feature Summary

• Integrates eight independent Darlington transistor pairs for high-gain switching applications
• Features open-collector outputs with common emitter connections for simplified circuit design
• Designed for high-voltage and high-current operation capabilities

Applications

• High-voltage relay driving circuits
• LED matrix displays and lighting control
• Industrial logic interface buffers
• Motor driver pre-stages

Procurement Notes

Verify the specific suffix 'C' against official STMicroelectronics documentation to ensure correct pinout and electrical specifications. Confirm that the 18-DIP package matches the target PCB footprint. Cross-reference the 90V Vceo and 400mA Ic ratings with system requirements to avoid derating issues. Ensure sourcing channels provide genuine components with traceable manufacturing data.

Selection Notes

Select this component when multiple high-side or low-side switching functions are required in a compact form factor. The integrated Darlington structure eliminates external base resistors, simplifying drive circuitry. Consider the 1.8W power dissipation limit and thermal management needs for the PDIP-18 package. Evaluate if the 90V blocking voltage meets the load requirements compared to lower-voltage alternatives.

Part Context

The L603C belongs to the L60x series of Darlington arrays, which includes variants like L601, L602, and L604. These devices share similar internal architectures but may differ in specific pin configurations or minor electrical characteristics. This series is designed for robust switching in industrial and consumer electronics environments requiring high gain and voltage isolation.

Replacement Considerations

Compatible substitutes include other STMicroelectronics Darlington arrays such as the L601, L602, or L604, provided pin compatibility and electrical ratings align. External equivalents should match the 8-channel Darlington topology, 90V minimum Vceo, and 18-pin DIP package constraints.