MC74ACT20D Equivalent & Substitute Parts

Part Overview

The MC74ACT20D is a NAND Gate IC featuring 2 channels with 4 inputs per channel in a 14-SOIC surface mount package. Manufactured by onsemi, this logic component operates within the 4.5V to 5.5V supply voltage range and is classified as obsolete. Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity, procurement flexibility, and long-term product support.

Key Parameters

Parameter	Value
Logic Type	NAND Gate
Number of Circuits	2
Number of Inputs	4
Voltage - Supply	4.5V ~ 5.5V
Current - Quiescent (Max)	4 µA
Current - Output High, Low	24mA, 24mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ V, Max CL	9ns @ 5V, 50pF
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
Series	74ACT

Substitute Part Grouping Explanation

Substitution for the MC74ACT20D is determined by strict equivalence across the following critical parameters:

Logic Type: NAND Gate (2 channels, 4 inputs per channel)
Package: 14-SOIC surface mount form factor
Voltage Supply Range: 4.5V ~ 5.5V
Output Drive Capability: 24mA high and low
Input Logic Levels: 0.8V low, 2V high
Series Classification: 74ACT

Substitute parts must maintain identical functional specifications and pinout compatibility. Variations in propagation delay and operating temperature range are permitted when the substitute part meets or exceeds the performance envelope of the original component.

Parameter Comparison

Parameter	MC74ACT20D (Main)	MC74ACT20DG	CD74ACT20M	CD74ACT20M96
Manufacturer	onsemi	onsemi	Harris Corporation	Texas Instruments
Logic Type	NAND Gate	NAND Gate	NAND Gate	NAND Gate
Number of Circuits	2	2	2	2
Number of Inputs	4	4	4	4
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Quiescent (Max)	4 µA	4 µA	4 µA	4 µA
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Input Logic Level - Low	0.8V	0.8V	0.8V	0.8V
Input Logic Level - High	2V	2V	2V	2V
Max Propagation Delay @ V, Max CL	9ns @ 5V, 50pF	9ns @ 5V, 50pF	14.6ns @ 5V, 50pF	14.6ns @ 5V, 50pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Product Status	Obsolete	Active	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

MC74ACT20DG (onsemi) is the primary direct substitute. This part maintains identical electrical specifications and operating temperature range as the MC74ACT20D while offering active product status and ROHS3 compliance. The packaging format is tube, suitable for standard component handling.

CD74ACT20M96 (Texas Instruments) is a functionally equivalent alternative with extended operating temperature range (-55°C ~ 125°C) and ROHS3 compliance. The propagation delay specification is 14.6ns, which exceeds the original 9ns but remains within acceptable logic circuit performance parameters. This part is supplied in Tape & Reel format.

CD74ACT20M (Harris Corporation) provides functional equivalence with extended operating temperature capability. However, this part carries obsolete product status and RoHS non-compliance, limiting its suitability for new designs or applications requiring regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT20DG be used as a direct replacement for MC74ACT20D?

A: Yes. MC74ACT20DG is a direct substitute manufactured by onsemi with identical electrical specifications, operating temperature range, and 14-SOIC package configuration. The primary advantage is active product status and ROHS3 compliance.

Q: What is the difference between the propagation delay specifications?

A: MC74ACT20D and MC74ACT20DG specify 9ns maximum propagation delay at 5V with 50pF load. CD74ACT20M and CD74ACT20M96 specify 14.6ns under identical conditions. Both values are within the 74ACT logic family performance envelope and are functionally compatible in standard digital logic applications.

Q: Are there packaging format differences among the substitutes?

A: Yes. MC74ACT20D and MC74ACT20DG are supplied in standard packaging. MC74ACT20DG uses tube packaging, while CD74ACT20M96 uses Tape & Reel format. All three maintain the 14-SOIC physical form factor and pinout compatibility.

Q: Which substitute is recommended for new designs?

A: CD74ACT20M96 (Texas Instruments) is recommended for new designs due to active product status, ROHS3 compliance, extended operating temperature range, and established long-term availability. MC74ACT20DG is suitable for direct replacement in existing designs.

Q: Are all substitutes RoHS compliant?

A: MC74ACT20DG and CD74ACT20M96 are ROHS3 compliant. CD74ACT20M and the original MC74ACT20D are RoHS non-compliant. Compliance requirements should be evaluated based on application and regulatory jurisdiction.

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