74ACQ245SCX Equivalent & Substitute Parts

Part Overview

The 74ACQ245SCX 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 is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design requirements and production continuity. The part operates across a 2V to 6V supply voltage range with symmetric output current ratings of 24mA for both high and low states, making it suitable for general-purpose bus transceiver applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ACQ245SCX
Manufacturer	onsemi
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)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACQ245SCX is determined by the following critical parameters:

Primary Substitution Criteria:

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)
Package / Case: 20-SOIC (0.295", 7.50mm Width)
Mounting Type: Surface Mount

Substitute parts are grouped into three categories based on their relationship to the main part:

Parametric Equivalents: Parts with identical electrical specifications and package dimensions. These include 74AC245SCX, MC74AC245DWR2G, SN74AC245DWR, and SN74AC245IDWREP. All maintain the 2V ~ 6V supply voltage range, -40°C ~ 85°C operating temperature, and 20-SOIC package footprint.

Direct Substitutes: Parts with matching core functionality and package but potentially different product status or compliance certifications. SN74AC245DW (Texas Instruments) qualifies as a direct substitute with identical electrical parameters, though it is discontinued at DiGi Electronics.

Similar Parts with Extended Operating Range: CD74AC245M96 and CD74AC245M operate across 1.5V ~ 5.5V supply voltage and -55°C ~ 125°C temperature range, providing broader environmental tolerance while maintaining the same logic function and package footprint.

Package Variant: SN74AC245NSR uses a 20-SO package (0.209", 5.30mm Width) instead of the standard 20-SOIC, representing a narrower package variant with identical electrical specifications.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements / Bits	Output Type	Current (mA)	Voltage Supply	Temp Range	Package	Product Status	RoHS Status
74ACQ245SCX	onsemi	Non-Inverting	1 / 8	3-State	24 / 24	2V ~ 6V	-40°C ~ 85°C	20-SOIC	Obsolete	REACH Unaffected
MC74AC245DWG	onsemi	Non-Inverting	1 / 8	3-State	24 / 24	2V ~ 6V	-40°C ~ 85°C	20-SOIC	Active	ROHS3 Compliant
74AC245SCX	onsemi	Non-Inverting	1 / 8	3-State	24 / 24	2V ~ 6V	-40°C ~ 85°C	20-SOIC	Active	ROHS3 Compliant
MC74AC245DWR2G	onsemi	Non-Inverting	1 / 8	3-State	24 / 24	2V ~ 6V	-40°C ~ 85°C	20-SOIC	Active	ROHS3 Compliant
SN74AC245DW	Texas Instruments	Non-Inverting	1 / 8	3-State	24 / 24	2V ~ 6V	-40°C ~ 85°C	20-SOIC	Discontinued	ROHS3 Compliant
SN74AC245DWR	Texas Instruments	Non-Inverting	1 / 8	3-State	24 / 24	2V ~ 6V	-40°C ~ 85°C	20-SOIC	Active	ROHS3 Compliant
SN74AC245IDWREP	Texas Instruments	Non-Inverting	1 / 8	3-State	24 / 24	2V ~ 6V	-40°C ~ 85°C	20-SOIC	Active	ROHS3 Compliant
SN74AC245NSR	Texas Instruments	Non-Inverting	1 / 8	3-State	24 / 24	2V ~ 6V	-40°C ~ 85°C	20-SO	Active	ROHS3 Compliant
CD74AC245M96	Texas Instruments	Non-Inverting	1 / 8	3-State	24 / 24	1.5V ~ 5.5V	-55°C ~ 125°C	20-SOIC	Active	ROHS3 Compliant
CD74AC245M	Harris Corporation	Non-Inverting	1 / 8	3-State	24 / 24	1.5V ~ 5.5V	-55°C ~ 125°C	20-SOIC	Obsolete	RoHS Non-Compliant

Engineering Selection Recommendations

Primary Recommendation - onsemi Active Parts: MC74AC245DWG, 74AC245SCX, and MC74AC245DWR2G are the preferred substitutes for the obsolete 74ACQ245SCX. All three maintain identical electrical specifications and package dimensions while offering active product status and ROHS3 compliance. MC74AC245DWR2G provides the highest inventory availability at 4686 pieces.

Secondary Recommendation - Texas Instruments Active Parts: SN74AC245DWR and SN74AC245IDWREP are parametric equivalents from Texas Instruments with active product status and ROHS3 compliance. Both maintain the 2V ~ 6V supply voltage and -40°C ~ 85°C operating temperature range. SN74AC245DWR offers superior inventory availability at 3200 pieces.

Extended Operating Range Alternative: CD74AC245M96 (Texas Instruments) provides an extended operating temperature range of -55°C ~ 125°C and supply voltage range of 1.5V ~ 5.5V while maintaining the same logic function and 20-SOIC package. This part is suitable for applications requiring broader environmental tolerance.

Package Variant Consideration: SN74AC245NSR uses a narrower 20-SO package (0.209", 5.30mm Width) compared to the standard 20-SOIC (0.295", 7.50mm Width). This variant is appropriate only if PCB layout accommodates the narrower footprint.

Avoid: CD74AC245M (Harris Corporation) is obsolete and RoHS non-compliant. SN74AC245DW (Texas Instruments) is discontinued at DiGi Electronics and should not be selected for new designs.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 74ACQ245SCX with MC74AC245DWG? A: Yes. MC74AC245DWG is a direct parametric equivalent with identical electrical specifications (2V ~ 6V supply, -40°C ~ 85°C operating range, 24mA output current), the same 20-SOIC package footprint, and active product status with ROHS3 compliance.

Q: What is the difference between 74AC245SCX and MC74AC245DWR2G? A: Both parts are parametric equivalents with identical electrical and mechanical specifications. The primary difference is packaging: 74AC245SCX is supplied in Cut Tape & Digi-Reel format, while MC74AC245DWR2G is also supplied in Cut Tape & Digi-Reel format. Both are active products from onsemi.

Q: Can I use SN74AC245NSR as a substitute? A: SN74AC245NSR is electrically equivalent but uses a narrower 20-SO package (0.209", 5.30mm Width) instead of the standard 20-SOIC (0.295", 7.50mm Width). Substitution is possible only if your PCB layout accommodates the narrower package footprint.

Q: Why should I avoid CD74AC245M? A: CD74AC245M is obsolete and RoHS non-compliant, making it unsuitable for new designs or applications requiring regulatory compliance.

Q: What is the advantage of CD74AC245M96 over other substitutes? A: CD74AC245M96 extends the operating temperature range to -55°C ~ 125°C and supply voltage range to 1.5V ~ 5.5V, providing broader environmental tolerance. However, it maintains identical logic function and 20-SOIC package dimensions. Select this part only if your application requires extended operating conditions.

Q: Are all recommended substitutes ROHS3 compliant? A: All active product substitutes (MC74AC245DWG, 74AC245SCX, MC74AC245DWR2G, SN74AC245DWR, SN74AC245IDWREP, SN74AC245NSR, and CD74AC245M96) are ROHS3 compliant. CD74AC245M is RoHS non-compliant and obsolete.

Q: What is the difference between the onsemi and Texas Instruments versions? A: Both manufacturers produce parametric equivalents with identical electrical specifications and package dimensions. Selection between them depends on availability, packaging format preference (Cut Tape & Digi-Reel vs. Tape & Reel), and supply chain considerations. No functional difference exists between the parts.

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