DM74145N

Overview

The DM74145N is a BCD-to-decimal decoder/driver manufactured by onsemi, housed in a 16-lead Plastic Dual-In-Line Package (PDIP). It operates within a supply voltage range of 4.75V to 5.25V and supports an operating temperature range of 0°C to +70°C. The device features high-breakdown NPN output transistors capable of sinking up to 80 mA, with a maximum HIGH Level Output Voltage of 15V. Propagation delay times are specified at 30 ns for both LOW-to-HIGH and HIGH-to-LOW transitions under standard load conditions.

Feature Summary

• Full decoding of input logic ensures all outputs remain OFF for invalid BCD input conditions
• High-performance NPN output transistors designed for indicator or relay driving applications
• Open-collector outputs compatible with most MOS integrated circuits

Applications

• Indicator drivers
• Relay drivers
• Open-collector logic-circuit drivers

Procurement Notes

Verify the component status as this part may be obsolete or discontinued. Confirm RoHS compliance requirements against specific project needs, as older revisions may not meet current environmental standards. Ensure the 16-pin PDIP package matches the target PCB footprint and that the 15V output capability aligns with downstream circuit tolerances.

Selection Notes

Select this component when interfacing binary coded decimal signals to decimal displays or control lines requiring high-voltage tolerance. The 80 mA sink capability allows direct driving of loads without additional buffering. Verify that the 30 ns propagation delay meets system timing constraints and that the open-collector nature of the outputs is suitable for the intended pull-up configuration.

Part Context

This device belongs to the 74-series logic family, specifically functioning as a decoder/driver. It converts four-bit BCD inputs into one-of-ten active-low outputs. The internal architecture consists of eight inverters and ten four-input NAND gates to ensure complete decoding coverage for valid and invalid input states.

Replacement Considerations

SN74145N