74ACTQ245MTCX Equivalent & Substitute Parts

Part Overview

The 74ACTQ245MTCX is a non-inverting transceiver logic IC manufactured by onsemi, featuring 1 element with 8 bits per element and 3-state output capability. This device operates within a 4.5V to 5.5V supply voltage range and is housed in a 20-TSSOP package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

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	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74ACTQ245MTCX is determined by strict equivalence across the following critical parameters: logic type (transceiver, non-inverting), number of elements (1), bits per element (8), output type (3-state), output current capability (24mA high and low), supply voltage range (4.5V ~ 5.5V), and operating temperature range (-40°C ~ 85°C). Package type and form factor are secondary considerations that may vary while maintaining functional compatibility.

Substitute parts are grouped into two categories:

Parametric Equivalents (Identical Package): Parts with identical 20-TSSOP packaging and all core electrical parameters matching the main part.

Similar Parts (Alternative Package): Parts with identical electrical parameters but different package types (20-SSOP), suitable for designs where package footprint flexibility exists.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Logic Type	Elements / Bits	Output Type	Current (mA)	Supply Voltage	Operating Temp	Package	Product Status	RoHS Status
74ACTQ245MTCX	onsemi	Transceiver, Non-Inverting	1 / 8	3-State	24 / 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-TSSOP	Obsolete	Not Specified
MC74ACT245DTG	onsemi	Transceiver, Non-Inverting	1 / 8	3-State	24 / 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-TSSOP	Obsolete	ROHS3 Compliant
74ACT245MTCX	onsemi	Transceiver, Non-Inverting	1 / 8	3-State	24 / 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-TSSOP	Active	ROHS3 Compliant
MC74ACT245DTR2G	onsemi	Transceiver, Non-Inverting	1 / 8	3-State	24 / 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-TSSOP	Active	ROHS3 Compliant
SN74ACT245PWR	Texas Instruments	Transceiver, Non-Inverting	1 / 8	3-State	24 / 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-TSSOP	Active	ROHS3 Compliant
CD74ACT245SM96	Texas Instruments	Transceiver, Non-Inverting	1 / 8	3-State	24 / 24	4.5V ~ 5.5V	-55°C ~ 125°C	20-SSOP	Active	ROHS3 Compliant
SN74ACT245DBR	Texas Instruments	Transceiver, Non-Inverting	1 / 8	3-State	24 / 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SSOP	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Parametric Equivalents with Identical Package:

For direct replacement with no PCB layout modifications, select from active-status parts with 20-TSSOP packaging: 74ACT245MTCX (onsemi), MC74ACT245DTR2G (onsemi), or SN74ACT245PWR (Texas Instruments). All three maintain identical electrical specifications and package footprint. MC74ACT245DTR2G and SN74ACT245PWR are preferred due to active product status and ROHS3 compliance certification.

Secondary Option - Alternative Package (20-SSOP):

For designs permitting package footprint changes, CD74ACT245SM96 (Texas Instruments) and SN74ACT245DBR (Texas Instruments) provide functional equivalence with 20-SSOP packaging. CD74ACT245SM96 offers extended operating temperature range (-55°C ~ 125°C) compared to the standard -40°C ~ 85°C specification. Both parts are active and ROHS3 compliant.

Obsolete Part Consideration:

MC74ACT245DTG remains obsolete status despite ROHS3 compliance. Avoid selection for new designs requiring long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can I use SN74ACT245PWR as a direct replacement for 74ACTQ245MTCX?

A: Yes. Both parts share identical electrical parameters (transceiver, non-inverting, 1 element, 8 bits, 3-state output, 24mA output current, 4.5V ~ 5.5V supply, -40°C ~ 85°C operating range) and 20-TSSOP packaging. SN74ACT245PWR is active status with ROHS3 compliance, making it suitable for direct PCB substitution.

Q: What is the difference between 20-TSSOP and 20-SSOP packages?

A: Both are 20-pin surface mount packages with identical pin counts and electrical compatibility. The primary difference is physical footprint: 20-TSSOP has 0.173" width (4.40mm), while 20-SSOP has 0.209" width (5.30mm). Package selection depends on available PCB real estate and design constraints.

Q: Why does CD74ACT245SM96 have a wider operating temperature range?

A: CD74ACT245SM96 is specified for -55°C ~ 125°C operation, compared to the standard -40°C ~ 85°C range. This extended specification reflects Texas Instruments' qualification testing for this particular part variant. The wider range does not affect compatibility with designs operating within the standard -40°C ~ 85°C window.

Q: Are all substitute parts ROHS3 compliant?

A: All active-status substitute parts listed (74ACT245MTCX, MC74ACT245DTR2G, SN74ACT245PWR, CD74ACT245SM96, SN74ACT245DBR) are ROHS3 compliant. The original 74ACTQ245MTCX does not specify RoHS status. Compliance certification is relevant for applications requiring environmental or regulatory adherence.

Q: Which substitute part has the best availability?

A: MC74ACT245DTR2G shows 5400 pieces in stock, the highest inventory level among all listed parts. SN74ACT245DBR and SN74ACT245PWR each show 3900 pieces. Inventory levels are subject to change and should be confirmed with current suppliers.

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