74FCT2245CTQG Equivalent & Substitute Parts

Part Overview

The 74FCT2245CTQG is a non-inverting transceiver logic IC manufactured by Renesas Electronics Corporation, designed for 8-bit bidirectional data transfer with 3-state output capability. This component operates within the 4.75V to 5.25V supply voltage range and is housed in a 20-SSOP package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	74FCT2245CTQG
Manufacturer	Renesas Electronics Corporation
Logic Type	Transceiver, Non-Inverting
Number of Elements	1
Number of Bits per Element	8
Output Type	3-State
Current - Output High, Low	15mA, 12mA
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SSOP (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74FCT2245CTQG is determined by strict alignment of 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
Voltage - Supply: 4.75V ~ 5.25V
Operating Temperature: -40°C ~ 85°C (TA)
Package / Case: 20-SSOP (0.154", 3.90mm Width)

Secondary Consideration:

Current - Output High, Low: 15mA, 12mA (exact match preferred; higher current ratings acceptable for direct replacement)

Substitute parts are grouped into two categories based on output current specifications:

Group 1 - Exact Current Match (15mA, 12mA): CY74FCT2245ATPWR, CY74FCT2245ATQCT, CY74FCT2245CTQCT, CY74FCT2245TQCT. These parts maintain identical output current characteristics to the original 74FCT2245CTQG.

Group 2 - Higher Current Rating (32mA, 64mA): CY74FCT245ATQCT, CY74FCT245CTQCT, CY74FCT245DTQCT, CY74FCT245TQCT. These parts feature increased output current capability and are based on the 74FCT245 base product number rather than 74FCT2245. They provide enhanced drive capability while maintaining all other critical parameters.

Parameter Comparison

Parameter	74FCT2245CTQG (Main)	CY74FCT2245ATPWR	CY74FCT2245ATQCT	CY74FCT2245CTQCT	CY74FCT2245TQCT	CY74FCT245ATQCT	CY74FCT245CTQCT	CY74FCT245DTQCT	CY74FCT245TQCT
Manufacturer	Renesas	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Logic Type	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting
Number of Elements	1	1	1	1	1	1	1	1	1
Number of Bits per Element	8	8	8	8	8	8	8	8	8
Output Type	3-State	3-State	3-State	3-State	3-State	3-State	3-State	3-State	3-State
Current - Output High, Low	15mA, 12mA	15mA, 12mA	15mA, 12mA	15mA, 12mA	15mA, 12mA	32mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 64mA
Voltage - Supply	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SSOP (0.154", 3.90mm Width)	20-TSSOP (0.173", 4.40mm Width)	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Discontinued at DiGi Electronics	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	2 (1 Year)	2 (1 Year)	1 (Unlimited)	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)

Engineering Selection Recommendations

For Direct Replacement with Identical Current Specifications:

Select from Group 1 substitutes (CY74FCT2245ATQCT, CY74FCT2245CTQCT, CY74FCT2245TQCT) when the original 15mA/12mA output current specification is a design requirement. All Group 1 parts are manufactured by Texas Instruments and carry Active product status, ensuring long-term availability. CY74FCT2245TQCT offers MSL 1 (Unlimited) rating, matching the original part's moisture sensitivity profile. CY74FCT2245ATQCT and CY74FCT2245CTQCT carry MSL 2 (1 Year) ratings.

CY74FCT2245ATPWR is available in 20-TSSOP packaging (0.173" width) rather than the standard 20-SSOP (0.154" width). This package variant requires PCB layout modification and is suitable only when board space permits the wider footprint.

For Applications Requiring Enhanced Drive Capability:

Group 2 substitutes (CY74FCT245ATQCT, CY74FCT245CTQCT, CY74FCT245TQCT) provide doubled output current (32mA/64mA) while maintaining all other critical electrical and thermal parameters. These parts are based on the 74FCT245 base product number and are suitable for applications where increased output drive capability improves signal integrity or reduces propagation delay. All Group 2 parts carry Active product status except CY74FCT245DTQCT, which is discontinued at DiGi Electronics.

Compliance and Regulatory Considerations:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original 74FCT2245CTQG regulatory profile. All parts share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications.

Frequently Asked Questions (FAQ)

Q: Can CY74FCT2245ATPWR be used as a direct replacement for 74FCT2245CTQG?

A: CY74FCT2245ATPWR is electrically equivalent but uses 20-TSSOP packaging (0.173" width) instead of 20-SSOP (0.154" width). PCB layout modification is required. If the original PCB footprint is 20-SSOP, select CY74FCT2245ATQCT, CY74FCT2245CTQCT, or CY74FCT2245TQCT instead.

Q: What is the difference between 74FCT2245 and 74FCT245 base product numbers?

A: The primary difference is output current specification. 74FCT2245 variants deliver 15mA/12mA output current, while 74FCT245 variants deliver 32mA/64mA. Both maintain identical logic function, pin configuration, and package compatibility. Selection depends on circuit drive requirements.

Q: Are all substitute parts in active production?

A: Most substitutes carry Active product status. CY74FCT245DTQCT is discontinued at DiGi Electronics. For long-term supply assurance, prioritize parts with Active status: CY74FCT2245ATPWR, CY74FCT2245ATQCT, CY74FCT2245CTQCT, CY74FCT2245TQCT, CY74FCT245ATQCT, CY74FCT245CTQCT, and CY74FCT245TQCT.

Q: Does moisture sensitivity level affect part selection?

A: MSL rating affects storage and handling requirements. The original 74FCT2245CTQG carries MSL 1 (Unlimited), requiring no special moisture control. CY74FCT2245TQCT also carries MSL 1. Other substitutes carry MSL 2 (1 Year), requiring controlled storage conditions and bake-out procedures before reflow soldering if shelf life exceeds one year.

Q: Can I use a higher current-rated part (74FCT245) in place of the original 74FCT2245?

A: Yes. Higher output current capability is backward compatible. The 74FCT245 variants will function correctly in circuits designed for 74FCT2245 parts. No circuit modification is required. This substitution improves signal drive capability without compromising functionality.

Q: What packaging options are available for substitutes?

A: Most substitutes use 20-SSOP (0.154" width) matching the original package. CY74FCT2245ATPWR uses 20-TSSOP (0.173" width). Packaging variants affect PCB footprint compatibility. Verify PCB layout before selecting a package variant.

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