74AC05SC Equivalent & Substitute Parts

Part Overview

The 74AC05SC is a 6-channel inverter IC with open-drain outputs in a 14-SOIC surface mount package, manufactured by onsemi. This logic component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The open-drain configuration allows for flexible output voltage levels and multi-source wiring capabilities in digital logic applications.

Key Parameters

Parameter	Value
Logic Type	Inverter
Number of Circuits	6
Number of Inputs	1
Features	Open Drain
Voltage - Supply	2V ~ 6V
Current - Quiescent (Max)	4 µA
Current - Output High, Low	-, 24mA
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C

Substitute Part Grouping Explanation

Substitution for the 74AC05SC is determined by the following critical parameters that must remain consistent across all equivalent parts:

Logic Type: Inverter with 6 channels, 1 input per channel
Output Configuration: Open Drain topology
Package: 14-SOIC form factor with identical pin assignments
Supply Voltage Range: Minimum 2V ~ 6V compatibility
Output Current: 24mA maximum sink capability
Quiescent Current: 4 µA maximum

All substitute parts listed maintain these core electrical and mechanical specifications, ensuring direct functional equivalence and PCB-level compatibility without design modifications.

Parameter Comparison

Parameter	74AC05SC (onsemi)	MC74AC05DG (onsemi)	MC74AC05DR2G (onsemi)	CD74AC05M (TI)	CD74AC05M96 (TI)
Manufacturer	onsemi	onsemi	onsemi	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Discontinued at DiGi Electronics	Active
Logic Type	Inverter	Inverter	Inverter	Inverter	Inverter
Number of Circuits	6	6	6	6	6
Features	Open Drain	Open Drain	Open Drain	Open Drain	Open Drain
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	1.5V ~ 5.5V	1.5V ~ 5.5V
Current - Quiescent (Max)	4 µA	4 µA	4 µA	4 µA	4 µA
Current - Output High, Low	-, 24mA	-, 24mA	-, 24mA	-, 24mA	-, 24mA
Max Propagation Delay @ 5V, 50pF	14ns	6ns	6ns	8.2ns	8.2ns
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Packaging Type	-	Tube	Tape & Reel (TR)	Tube	Cut Tape (CT) & Digi-Reel®
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Availability	788 Pcs	2070 Pcs	1500 Pcs	1211 Pcs	2770 Pcs

Engineering Selection Recommendations

Primary Recommendation: MC74AC05DG or MC74AC05DR2G (onsemi)

Both onsemi alternatives maintain identical electrical specifications to the 74AC05SC while offering active product status. MC74AC05DG is supplied in tube packaging, while MC74AC05DR2G is supplied in tape and reel format for automated assembly. Both are ROHS3 compliant and provide improved propagation delay performance (6ns versus 14ns).

Secondary Recommendation: CD74AC05M96 (Texas Instruments)

The CD74AC05M96 is an active product with extended operating temperature range (-55°C ~ 125°C) and broader supply voltage tolerance (1.5V ~ 5.5V). This part is suitable for applications requiring enhanced temperature performance. It is supplied in cut tape and Digi-Reel® packaging and maintains ROHS3 compliance.

Alternative: CD74AC05M (Texas Instruments)

The CD74AC05M offers equivalent specifications to CD74AC05M96 but is discontinued at DiGi Electronics. Selection should prioritize CD74AC05M96 for long-term availability assurance.

All substitute parts are pin-compatible with the 74AC05SC and require no PCB modifications for direct replacement.

Frequently Asked Questions (FAQ)

Q: Can MC74AC05DG replace 74AC05SC directly on the PCB?

A: Yes. Both parts use the 14-SOIC package with identical pin assignments and electrical specifications. No PCB layout changes are required.

Q: What is the difference between MC74AC05DG and MC74AC05DR2G?

A: Both parts are electrically identical. The difference is packaging: MC74AC05DG is supplied in tube format for manual handling, while MC74AC05DR2G is supplied in tape and reel format for automated pick-and-place assembly.

Q: Why does CD74AC05M96 have a wider operating temperature range than the 74AC05SC?

A: CD74AC05M96 is manufactured by Texas Instruments with different process specifications, resulting in -55°C ~ 125°C operation versus -40°C ~ 85°C for the onsemi part. Both are functionally equivalent for standard industrial temperature ranges.

Q: Are all substitute parts RoHS compliant?

A: Yes. MC74AC05DG, MC74AC05DR2G, CD74AC05M, and CD74AC05M96 are all ROHS3 compliant. The original 74AC05SC RoHS status was not specified in available documentation.

Q: What does "open drain" mean for output configuration?

A: Open drain outputs require an external pull-up resistor to establish a high logic level. This configuration allows multiple outputs to be wire-ORed together and supports flexible output voltage levels independent of the IC supply voltage.

Q: Which substitute part has the fastest propagation delay?

A: MC74AC05DG and MC74AC05DR2G both offer 6ns propagation delay at 5V with 50pF load, compared to 14ns for the original 74AC05SC and 8.2ns for the Texas Instruments alternatives.

Q: Is inventory availability a factor in part selection?

A: Inventory levels vary by distributor and time. CD74AC05M96 currently shows the highest stock level (2770 Pcs), followed by MC74AC05DG (2070 Pcs). Verify current availability with your component supplier before finalizing procurement decisions.

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