74ACQ245PC Equivalent & Substitute Parts

Part Overview

The 74ACQ245PC is an octal bus transceiver with non-inverting logic, featuring 3-state outputs and designed for 20-PDIP through-hole mounting. Manufactured by onsemi, this component operates across a 2V to 6V supply voltage range with 24mA output drive capability. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring this functional specification.

Key Parameters

Parameter	Value
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	Through Hole
Package / Case	20-DIP (0.300", 7.62mm)
Supplier Device Package	20-PDIP

Substitute Part Grouping Explanation

Substitution for the 74ACQ245PC is determined by strict equivalence across the following critical parameters:

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-DIP (0.300", 7.62mm)
Mounting Type: Through Hole

Substitute parts are classified into two categories:

Direct Manufacturer Equivalent: SN74AC245N (Texas Instruments) — identical electrical and mechanical specifications with active product status.

Parametric Equivalent: SN74AC245NE4 (Texas Instruments) — matches all critical electrical parameters and package specifications with active product status.

Similar Part: CD74AC245E (Harris Corporation) — shares functional and package specifications but operates within a different voltage range (1.5V ~ 5.5V) and temperature range (-55°C ~ 125°C), classified as obsolete.

Parameter Comparison

Parameter	74ACQ245PC (onsemi)	SN74AC245N (TI)	SN74AC245NE4 (TI)	CD74AC245E (Harris)
Logic Type	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting
Number of Elements	1	1	1	1
Number of Bits per Element	8	8	8	8
Output Type	3-State	3-State	3-State	3-State
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	1.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-55°C ~ 125°C (TA)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)
Product Status	Obsolete	Active	Active	Obsolete
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

Primary Substitutes (Recommended):

SN74AC245N and SN74AC245NE4 (both Texas Instruments) are the preferred substitutes for the 74ACQ245PC. Both parts maintain identical electrical specifications, package configuration, and operating parameters. Both are classified as active products with ROHS3 compliance, ensuring long-term availability and regulatory alignment for new designs and production continuity.

Secondary Substitute (Limited Application):

CD74AC245E (Harris Corporation) provides functional equivalence and identical package specifications. However, this part operates within a different voltage range (1.5V ~ 5.5V) and extended temperature range (-55°C ~ 125°C). Selection of this part is appropriate only when system design requirements align with these extended operating parameters. The part is classified as obsolete, limiting its suitability for new production.

Frequently Asked Questions (FAQ)

Q: Can SN74AC245N be used as a direct replacement for 74ACQ245PC?

A: Yes. SN74AC245N matches all critical electrical parameters, output drive capability, supply voltage range, operating temperature range, and 20-PDIP package specification. The part is active and ROHS3 compliant.

Q: What is the difference between SN74AC245N and SN74AC245NE4?

A: Both parts are manufactured by Texas Instruments and share identical electrical specifications and package configuration. SN74AC245NE4 is a parametric equivalent variant. Selection between these parts depends on packaging and supplier availability requirements.

Q: Can CD74AC245E replace the 74ACQ245PC in all applications?

A: CD74AC245E shares the same functional logic type, element count, bit width, output type, and package. However, it operates within a different voltage range (1.5V ~ 5.5V versus 2V ~ 6V) and extended temperature range (-55°C ~ 125°C versus -40°C ~ 85°C). Use this part only when system design requirements accommodate these parameter differences.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All substitute parts are available in 20-PDIP through-hole packaging with identical mechanical dimensions (0.300", 7.62mm), ensuring direct socket compatibility.

Q: What compliance certifications apply to the substitute parts?

A: SN74AC245N and SN74AC245NE4 are ROHS3 compliant. CD74AC245E is RoHS non-compliant. All parts carry REACH Unaffected status and EAR99 ECCN classification.

Q: Why is the 74ACQ245PC classified as obsolete?

A: The 74ACQ245PC is an obsolete product. Active alternatives from Texas Instruments (SN74AC245N and SN74AC245NE4) are recommended for new designs and production applications requiring this functional specification.

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