LM339DBR

Overview

The LM339DBR is a quad differential comparator manufactured by Texas Instruments, designed for general-purpose analog signal processing. It features four independent comparators within a single package, utilizing open-drain outputs that facilitate wired-AND connections and voltage level translation. The device operates with a wide single-supply voltage range from 2 V to 36 V or dual supplies up to ±18 V. It employs bipolar technology and is housed in a standard SOIC-14 surface-mount package, suitable for industrial and consumer applications requiring low power consumption and high reliability.

Feature Summary

• Quad differential architecture providing four independent comparison channels
• Open-drain output configuration enabling flexible logic interfacing
• Wide single-supply operating voltage range supporting diverse power environments

Applications

• Over/under voltage monitoring circuits
• Temperature sensing systems using thermistors
• Logic level shifting between different voltage domains

Procurement Notes

Verify the specific datasheet revision corresponding to the LM339DBR part number to ensure compatibility with required electrical characteristics. Confirm that the SOIC-14 package dimensions align with PCB footprint specifications. Check for any lead-free or RoHS compliance markings if environmental regulations apply to the final assembly. Ensure supply chain sources provide authentic components from authorized distributors to prevent counterfeit risks.

Selection Notes

Select this component when multiple independent voltage comparisons are required in a compact form factor. The open-drain output simplifies interface design with various logic families without additional pull-up resistors per channel. Consider the input offset voltage and propagation delay specifications against application timing requirements. Evaluate thermal performance within the SOIC-14 package for expected power dissipation levels in the target environment.

Part Context

This component belongs to the LM339 family of quad comparators, a widely used series in analog circuit design. The 'D' suffix indicates the SOIC-14 surface-mount package variant, while 'B' typically denotes tape-and-reel packaging for automated assembly. It serves as a cost-effective solution for replacing discrete comparator arrangements in space-constrained designs.

Replacement Considerations

Compatible substitutes include LM339DR, LM339N, and LM339MX-NOPB. Verify pinout compatibility and electrical parameter equivalence before substitution. Ensure the alternative package type matches the existing PCB layout constraints.