MM74C908N

Specialty Logic Overview

The MM74C908N is a dual high-voltage driver manufactured by onsemi (originally Fairchild Semiconductor) housed in an 8-Lead Plastic Dual-In-Line Package (PDIP). It integrates two CMOS NAND gates driving emitter follower Darlington outputs to provide high current and voltage capabilities. The device operates within a supply voltage range of 3V to 18V, with an absolute maximum rating of 19V. In the OFF state, outputs withstand up to -30V. Key electrical parameters include a typical output ON resistance of 8Ω and a sourcing capability of at least 250mA at VCC − 3V. Propagation delays vary from 65ns to 300ns depending on supply voltage.

Specialty Logic Feature Summary

• Integrates two independent high-voltage drivers utilizing CMOS NAND gates and emitter follower Darlington outputs for robust signal interfacing.
• Capable of sourcing significant current while maintaining low output resistance, facilitating direct drive for demanding loads.
• Provides high noise immunity suitable for environments requiring reliable digital-to-analog or control-level translation.

Specialty Logic Applications

• Driving electromechanical relays
• Controlling industrial regulators
• Powering lamp circuits

Specialty Logic Procurement Notes

Verify component authenticity as this part was originally produced by Fairchild Semiconductor before its acquisition by onsemi. Confirm package integrity and pin alignment against the N08E specification. Check datasheet revisions to ensure compatibility with specific thermal and electrical requirements. Validate that the operating temperature range meets system constraints.

Specialty Logic Selection Notes

Select this component when interfacing standard CMOS logic levels with high-voltage or high-current loads such as relays. Ensure the application does not exceed the absolute maximum ratings, particularly regarding output voltage and power dissipation. Consider thermal management strategies given the junction temperature dependence of output resistance.

Specialty Logic Part Context

This device belongs to the MM74C series of general-purpose CMOS logic components. It is designed for applications requiring interface between low-voltage digital circuits and higher voltage analog or power loads. The PDIP-8 package facilitates through-hole mounting for prototyping and industrial equipment.

Specialty Logic Replacement Considerations

Direct substitutes may include other dual relay drivers from manufacturers like National Semiconductor or Integrated Device Technology, provided they match the 30V/250mA specifications and DIP-8 footprint. Verify pinout compatibility and electrical characteristics before substitution.