74FCT3245APGG Equivalent & Substitute Parts

Part Overview

The 74FCT3245APGG is a non-inverting transceiver logic IC manufactured by Renesas Electronics Corporation. This 20-TSSOP surface mount device operates at 3.6V supply voltage and provides 1 element with 8 bits per element in a 3-state output configuration. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are necessary when the 74FCT3245APGG becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when system design specifications allow for compatible voltage and current ratings from alternative manufacturers.

Key Parameters

Parameter	Value
Manufacturer Part Number	74FCT3245APGG
Manufacturer	Renesas Electronics Corporation
Logic Type	Transceiver, Non-Inverting
Number of Elements	1
Number of Bits per Element	8
Output Type	3-State
Voltage - Supply	2.7V ~ 3.6V
Current - Output High, Low	8mA, 24mA
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitution of the 74FCT3245APGG is determined by the following critical parameters:

Functional Compatibility: All substitute parts maintain the same logic type (Transceiver, Non-Inverting), element count (1), and bit configuration (8 bits per element) with 3-state output capability.

Voltage Tolerance: The 74FCT3245APGG operates at 2.7V ~ 3.6V. Substitute parts from Texas Instruments operate at 4.75V ~ 5.25V, representing a higher voltage class. Substitution is valid only in applications where the system voltage can accommodate the higher supply range or where voltage regulation ensures compatibility.

Current Ratings: Output current specifications vary among substitutes. The 74FCT3245APGG provides 8mA (high) and 24mA (low). Substitute parts CY74FCT2245 variants provide 15mA (high) and 12mA (low), while CY74FCT245 variants provide 32mA (high) and 64mA (low). Higher current ratings are compatible with applications designed for the original part.

Package Considerations: The 74FCT3245APGG uses 20-TSSOP packaging (0.173", 4.40mm width). Substitute parts use 20-SSOP packaging (0.154", 3.90mm width). These are distinct package geometries requiring PCB layout modifications.

Temperature Range: All parts share the identical operating temperature range of -40°C ~ 85°C.

Compliance: All parts maintain RoHS3 compliance and REACH unaffected status.

Parameter Comparison

Parameter	74FCT3245APGG	CY74FCT2245ATQCT	CY74FCT2245CTQCT	CY74FCT2245TQCT	CY74FCT245ATQCT	CY74FCT245CTQCT	CY74FCT245TQCT
Manufacturer	Renesas	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
Number of Elements	1	1	1	1	1	1	1
Number of Bits per Element	8	8	8	8	8	8	8
Output Type	3-State	3-State	3-State	3-State	3-State	3-State	3-State
Voltage - Supply	2.7V ~ 3.6V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Current - Output High, Low	8mA, 24mA	15mA, 12mA	15mA, 12mA	15mA, 12mA	32mA, 64mA	32mA, 64mA	32mA, 64mA
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
Package / Case	20-TSSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

CY74FCT2245 Series (ATQCT, CTQCT, TQCT variants): These parts are recommended for applications requiring moderate current output (15mA high, 12mA low) at 5V supply voltage. All three variants maintain active product status with RoHS3 compliance. The TQCT variant offers unlimited moisture sensitivity (MSL 1), while ATQCT and CTQCT variants specify 1-year moisture sensitivity (MSL 2). Selection between packaging formats (Tape & Reel or Cut Tape) depends on manufacturing process requirements.

CY74FCT245 Series (ATQCT, CTQCT, TQCT variants): These parts provide higher output current capability (32mA high, 64mA low) at 5V supply voltage and are suitable for applications with greater current demands. All variants maintain active product status and RoHS3 compliance. The TQCT variant offers unlimited moisture sensitivity (MSL 1), while ATQCT and CTQCT variants specify 1-year moisture sensitivity (MSL 2).

CY74FCT245DTQCT: This variant is discontinued at DiGi Electronics and should not be selected for new designs requiring long-term availability assurance.

Package Transition Consideration: Migration from 20-TSSOP to 20-SSOP packaging requires PCB layout redesign due to different footprint geometries. The 20-SSOP package is narrower (0.154" versus 0.173"), necessitating updated placement and routing.

Voltage Class Transition: All Texas Instruments substitutes operate at 4.75V ~ 5.25V, representing a shift from the 74FCT3245APGG's 2.7V ~ 3.6V class. This substitution is valid only in systems designed for 5V operation or where voltage regulation ensures proper supply levels.

Frequently Asked Questions (FAQ)

Q: Can the CY74FCT2245 series directly replace the 74FCT3245APGG without circuit modifications?

A: Functional replacement is possible if the system operates at 5V supply voltage. However, PCB layout modifications are required due to package geometry differences (20-TSSOP versus 20-SSOP). Voltage supply compatibility must be confirmed before substitution.

Q: What is the difference between CY74FCT2245 and CY74FCT245 variants?

A: Both series maintain identical logic functionality and package geometry. The primary difference is output current rating: CY74FCT2245 provides 15mA (high) and 12mA (low), while CY74FCT245 provides 32mA (high) and 64mA (low). Selection depends on the application's current drive requirements.

Q: Does packaging format (Tape & Reel versus Cut Tape) affect electrical performance?

A: No. Packaging format differences (ATQCT, CTQCT, TQCT) do not affect electrical specifications. Selection is based on manufacturing process compatibility and inventory management requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the compliance profile of the 74FCT3245APGG.

Q: What is the significance of Moisture Sensitivity Level (MSL) differences?

A: MSL 1 (unlimited) parts have no moisture exposure time restrictions during storage and handling. MSL 2 (1 year) parts require controlled moisture conditions and have a one-year shelf life limit. The CY74FCT2245TQCT and CY74FCT245TQCT variants offer MSL 1 for applications with extended storage requirements.

Q: Can I use a substitute part with higher current output in a design specified for the 74FCT3245APGG?

A: Yes. Higher output current ratings are backward compatible. A part rated for 32mA (high) and 64mA (low) can be used in applications designed for 8mA (high) and 24mA (low) without performance degradation.

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