DM7473N Equivalent & Substitute Parts

Part Overview

The DM7473N is a dual 1-bit JK-type flip-flop logic integrated circuit manufactured by onsemi in a 14-DIP package. This device features complementary outputs, positive edge triggering, and operates at a maximum clock frequency of 15 MHz with a supply voltage range of 4.75V to 5.25V. The DM7473N is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility through matching package type, pin configuration, logic family characteristics, and electrical performance within acceptable operating parameters.

Substiute Parts

DM7473N

onsemiIn Stock: 19147DM7473N Datasheet

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CD74HCT73E

Texas InstrumentsIn Stock: 2232CD74HCT73E Datasheet

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SN74LS73AN

Texas InstrumentsIn Stock: 13506SN74LS73AN Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DM7473N are selected based on the following critical parameters that determine functional compatibility:

Package Compatibility: All substitute parts must use the 14-DIP (0.300", 7.62mm) through-hole package to ensure direct pin-for-pin replacement capability.

Logic Function: All candidates must be dual 1-bit JK-type flip-flops with complementary outputs to maintain circuit functionality.

Electrical Characteristics: Substitute parts must operate within overlapping supply voltage ranges and support the required clock frequency performance. The DM7473N operates at 15 MHz maximum; substitute parts with higher frequency ratings provide performance headroom.

Trigger Configuration: The DM7473N uses positive edge triggering. Substitute parts with negative edge triggering require circuit redesign and are listed for reference only where alternative logic families are considered.

Active Product Status: Substitute parts with active product status ensure long-term availability and continued manufacturing support, addressing the obsolescence of the original DM7473N.

Parameter Comparison

Engineering Selection Recommendations

SN74LS73AN (Texas Instruments 74LS Series): This part maintains identical supply voltage specifications (4.75V ~ 5.25V) and operating temperature range (0°C ~ 70°C) as the DM7473N, ensuring direct compatibility with existing power supply and thermal management designs. The SN74LS73AN is rated for 45 MHz operation, providing 3x performance margin over the original 15 MHz specification. Output current characteristics (400µA high, 8mA low) are comparable to the DM7473N. The part holds active product status with ROHS3 compliance, ensuring long-term availability. The primary design consideration is the negative edge trigger configuration, which requires circuit logic inversion if positive edge triggering is required in the original application.

CD74HCT73E (Texas Instruments 74HCT Series): This part operates at 60 MHz, providing 4x performance margin over the DM7473N. The supply voltage range (4.5V ~ 5.5V) is slightly wider, and the operating temperature range extends to -55°C ~ 125°C, supporting broader environmental applications. Output current is symmetrical at 4mA for both high and low states, with lower quiescent current (4µA) compared to the DM7473N. The part is ROHS3 compliant with active product status. Like the SN74LS73AN, the CD74HCT73E uses negative edge triggering and requires circuit redesign if positive edge operation is mandatory.

Both substitute parts are available in active production with established supply chains and compliance certifications suitable for modern manufacturing environments.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS73AN or CD74HCT73E directly replace the DM7473N without circuit modification?

A: Both parts share the 14-DIP package and dual 1-bit JK-type flip-flop function with complementary outputs. However, the SN74LS73AN and CD74HCT73E use negative edge triggering while the DM7473N uses positive edge triggering. If the original circuit relies on positive edge triggering for timing synchronization, the substitute part will trigger on the opposite clock edge, requiring circuit logic inversion or clock signal modification.

Q: What are the key electrical differences between the 74LS and 74HCT logic families?

A: The 74LS series (SN74LS73AN) operates within the 4.75V ~ 5.25V supply range with maximum frequency of 45 MHz and output currents of 400µA (high) and 8mA (low). The 74HCT series (CD74HCT73E) operates within 4.5V ~ 5.5V with maximum frequency of 60 MHz and symmetrical output currents of 4mA. The 74HCT series provides higher frequency performance and lower quiescent current, making it suitable for power-sensitive applications.

Q: Are both substitute parts suitable for new production designs?

A: Yes. Both the SN74LS73AN and CD74HCT73E hold active product status with ROHS3 compliance, ensuring availability for new designs and ongoing production. The DM7473N is obsolete and should not be specified for new applications.

Q: What is the impact of negative edge triggering on circuit design?

A: Negative edge triggering causes the flip-flop to capture input data on the falling edge of the clock signal rather than the rising edge. If the original DM7473N circuit requires positive edge triggering, the substitute part will operate out of phase. This can be corrected by inverting the clock signal using a logic gate or by redesigning the timing logic to accommodate the opposite trigger edge.

Q: Do the substitute parts support the same operating temperature range as the DM7473N?

A: The SN74LS73AN matches the DM7473N operating range of 0°C ~ 70°C. The CD74HCT73E extends this range to -55°C ~ 125°C, providing compatibility with wider environmental conditions including industrial and military temperature specifications.

Q: What packaging considerations apply to these through-hole components?

A: All three parts use the 14-DIP (0.300", 7.62mm) through-hole package with identical pin configurations. They are mechanically and electrically interchangeable at the package level, allowing direct socket replacement without PCB redesign.