74ACQ245SC Equivalent & Substitute Parts

Part Overview

The 74ACQ245SC is a non-inverting transceiver logic IC manufactured by onsemi, featuring 1 element with 8 bits per element and 3-state output capability in a 20-SOIC package. This component operates across a 2V to 6V supply voltage range with output currents of 24mA for both high and low states, suitable for general-purpose digital signal buffering and bus interface applications.

The 74ACQ245SC is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure component availability, and support ongoing production requirements. Active alternatives from onsemi and Texas Instruments provide identical or compatible electrical and mechanical specifications with current manufacturing status.

Key Parameters

Parameter	Specification
Logic Type	Transceiver, Non-Inverting
Number of Elements	1
Number of Bits per Element	8
Output Type	3-State
Current - Output High, Low	24mA, 24mA
Voltage - Supply	2V ~ 6V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	20-SOIC (0.295", 7.50mm Width)

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACQ245SC is determined by the following critical parameters:

Logic Type: Must be Transceiver, Non-Inverting
Number of Elements: Must be 1
Number of Bits per Element: Must be 8
Output Type: Must be 3-State
Current - Output High, Low: Must be 24mA, 24mA
Voltage - Supply: Must support 2V ~ 6V range
Operating Temperature: Must support -40°C ~ 85°C minimum
Mounting Type: Must be Surface Mount
Package / Case: Must be 20-SOIC (0.295", 7.50mm Width)

Substitute parts are categorized as follows:

Direct Equivalents (identical electrical and mechanical specifications, active product status):

SN74AC245DWR (Texas Instruments)
SN74AC245IDWREP (Texas Instruments)

Parametric Equivalents (identical electrical specifications, alternative packaging or status):

MC74AC245DWR2G (onsemi)
MC74AC245DWG (onsemi)
SN74AC245DW (Texas Instruments)

Similar Alternatives (compatible electrical specifications with extended operating temperature or voltage range):

CD74AC245M96 (Texas Instruments)
CD74AC245M (Harris Corporation)

Package Variant (identical electrical specifications, different package dimensions):

SN74AC245NSR (Texas Instruments) - 20-SO package (0.209", 5.30mm Width)

Parameter Comparison

Part Number	Manufacturer	Product Status	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Voltage Supply	Temp Range	Package	Packaging Type
74ACQ245SC	onsemi	Obsolete	Non-Inverting Transceiver	1	8	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (7.50mm)	-
MC74AC245DWR2G	onsemi	Active	Non-Inverting Transceiver	1	8	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (7.50mm)	Cut Tape & Digi-Reel
MC74AC245DWG	onsemi	Active	Non-Inverting Transceiver	1	8	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (7.50mm)	Tube
SN74AC245DWR	Texas Instruments	Active	Non-Inverting Transceiver	1	8	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (7.50mm)	Cut Tape & Digi-Reel
SN74AC245IDWREP	Texas Instruments	Active	Non-Inverting Transceiver	1	8	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (7.50mm)	Tape & Reel
SN74AC245DW	Texas Instruments	Discontinued at DiGi Electronics	Non-Inverting Transceiver	1	8	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC (7.50mm)	-
SN74AC245NSR	Texas Instruments	Active	Non-Inverting Transceiver	1	8	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SO (5.30mm)	Cut Tape & Digi-Reel
CD74AC245M96	Texas Instruments	Active	Non-Inverting Transceiver	1	8	3-State	24/24	1.5V ~ 5.5V	-55°C ~ 125°C	20-SOIC (7.50mm)	Tape & Reel
CD74AC245M	Harris Corporation	Obsolete	Non-Inverting Transceiver	1	8	3-State	24/24	1.5V ~ 5.5V	-55°C ~ 125°C	20-SOIC (7.50mm)	Tube

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement)

MC74AC245DWR2G and MC74AC245DWG from onsemi are direct parametric equivalents with active product status and ROHS3 compliance. Both maintain identical electrical specifications and 20-SOIC packaging. Selection between these depends on packaging requirements: MC74AC245DWR2G is supplied in Cut Tape & Digi-Reel format, while MC74AC245DWG is supplied in Tube format.

SN74AC245DWR from Texas Instruments is a direct equivalent with active status, ROHS3 compliance, and Cut Tape & Digi-Reel packaging. This part provides cross-manufacturer compatibility while maintaining identical electrical and mechanical specifications.

SN74AC245IDWREP from Texas Instruments is functionally equivalent with active status and ROHS3 compliance, supplied in Tape & Reel format. This variant is suitable for high-volume automated assembly processes.

Extended Temperature Range Alternative

CD74AC245M96 from Texas Instruments extends the operating temperature range to -55°C ~ 125°C and supports a lower supply voltage floor of 1.5V, while maintaining the 2V ~ 6V operating window of the original part. This part is active and ROHS3 compliant, making it suitable for applications requiring enhanced thermal performance.

Package Variant

SN74AC245NSR from Texas Instruments provides identical electrical specifications in a 20-SO package (0.209", 5.30mm Width) instead of the standard 20-SOIC (0.295", 7.50mm Width). This variant is active and ROHS3 compliant, suitable only if PCB layout accommodates the narrower package footprint.

Avoid

SN74AC245DW is discontinued at DiGi Electronics and should not be selected for new designs. CD74AC245M from Harris Corporation is obsolete and should not be selected for new designs.

Frequently Asked Questions (FAQ)

Q: Can I use MC74AC245DWR2G as a direct replacement for 74ACQ245SC?

A: Yes. MC74AC245DWR2G is a direct parametric equivalent with identical electrical specifications (24mA output current, 2V ~ 6V supply, -40°C ~ 85°C operating range) and identical 20-SOIC packaging. The primary difference is product status: MC74AC245DWR2G is active with current manufacturing availability, while 74ACQ245SC is obsolete.

Q: What is the difference between MC74AC245DWR2G and MC74AC245DWG?

A: Both parts are parametrically identical with the same electrical specifications and 20-SOIC package. The difference is packaging format: MC74AC245DWR2G is supplied in Cut Tape & Digi-Reel format for automated pick-and-place assembly, while MC74AC245DWG is supplied in Tube format for manual handling or lower-volume applications.

Q: Can I use SN74AC245NSR instead of 74ACQ245SC?

A: SN74AC245NSR is electrically equivalent but uses a 20-SO package (0.209", 5.30mm Width) instead of the 20-SOIC package (0.295", 7.50mm Width) of the original part. This narrower package requires PCB layout modification and is only suitable if your design can accommodate the different footprint.

Q: Why would I choose CD74AC245M96 over other substitutes?

A: CD74AC245M96 extends the operating temperature range to -55°C ~ 125°C and supports a lower supply voltage floor of 1.5V. Select this part only if your application requires enhanced thermal performance beyond the standard -40°C ~ 85°C range. For standard applications, direct equivalents like MC74AC245DWR2G or SN74AC245DWR are preferred.

Q: Are all substitute parts RoHS compliant?

A: Most active substitutes are ROHS3 compliant. The original 74ACQ245SC has REACH Unaffected status. Verify RoHS compliance requirements for your specific application and supply chain before final part selection.

Q: What inventory levels are available for substitute parts?

A: MC74AC245DWR2G has 4,686 units in stock, MC74AC245DWG has 2,154 units, SN74AC245DWR has 3,200 units, SN74AC245IDWREP has 736 units, SN74AC245NSR has 7,200 units, and CD74AC245M96 has 5,257 units. Verify current availability with your supplier before committing to production schedules.

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