PI74FCT245TQEX Equivalent & Substitute Parts

Part Overview

The PI74FCT245TQEX is a non-inverting octal bidirectional transceiver manufactured by Diodes Incorporated, designed for 5.25V logic applications. This component features 1 element with 8 bits per element, 3-state output capability, and operates across the -40°C to 85°C temperature range. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI74FCT245TQEX
Manufacturer	Diodes Incorporated
Series	74FCT
Logic Type	Transceiver, Non-Inverting
Number of Elements	1
Number of Bits per Element	8
Output Type	3-State
Current - Output High, Low	15mA, 64mA
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
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 for the PI74FCT245TQEX 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
Voltage - Supply: 4.75V ~ 5.25V
Operating Temperature: -40°C ~ 85°C (TA)
Mounting Type: Surface Mount

Package Compatibility: Substitutes are grouped into two package categories:

20-SSOP (0.154", 3.90mm Width) - Direct footprint equivalent
20-TSSOP (0.173", 4.40mm Width) - Alternate surface mount package with different pitch

Output Current Considerations: The main part specifies 15mA output high and 64mA output low. Substitutes with identical or higher output current ratings maintain full compatibility. The 74FCT3245 series operates at lower voltage (2.7V ~ 3.6V) and reduced output current (8mA, 24mA), making it suitable only for 3.3V logic systems.

Product Status: Active substitutes are preferred over obsolete parts for long-term design support and procurement reliability.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Logic Type	Output Type	Current - Output High, Low	Voltage - Supply	Operating Temperature	Package / Case	Product Status
PI74FCT245TQEX	Diodes Incorporated	Transceiver, Non-Inverting	3-State	15mA, 64mA	4.75V ~ 5.25V	-40°C ~ 85°C (TA)	20-SSOP (0.154", 3.90mm Width)	Obsolete
74FCT245ATPGG	IDT, Integrated Device Technology Inc	Transceiver, Non-Inverting	3-State	15mA, 64mA	4.75V ~ 5.25V	-40°C ~ 85°C (TA)	20-TSSOP (0.173", 4.40mm Width)	Active
74FCT245ATQG	Renesas Electronics Corporation	Transceiver, Non-Inverting	3-State	15mA, 64mA	4.75V ~ 5.25V	-40°C ~ 85°C (TA)	20-SSOP (0.154", 3.90mm Width)	Active
74FCT245CTQG	IDT, Integrated Device Technology Inc	Transceiver, Non-Inverting	3-State	15mA, 64mA	4.75V ~ 5.25V	-40°C ~ 85°C (TA)	20-SSOP (0.154", 3.90mm Width)	Active
74FCT3245APGG	Renesas Electronics Corporation	Transceiver, Non-Inverting	3-State	8mA, 24mA	2.7V ~ 3.6V	-40°C ~ 85°C (TA)	20-TSSOP (0.173", 4.40mm Width)	Active
74FCT3245APGG8	Renesas Electronics Corporation	Transceiver, Non-Inverting	3-State	8mA, 24mA	2.7V ~ 3.6V	-40°C ~ 85°C (TA)	20-TSSOP (0.173", 4.40mm Width)	Active
CY74FCT2245ATPWR	Texas Instruments	Transceiver, Non-Inverting	3-State	15mA, 12mA	4.75V ~ 5.25V	-40°C ~ 85°C (TA)	20-TSSOP (0.173", 4.40mm Width)	Active
CY74FCT2245ATQCT	Texas Instruments	Transceiver, Non-Inverting	3-State	15mA, 12mA	4.75V ~ 5.25V	-40°C ~ 85°C (TA)	20-SSOP (0.154", 3.90mm Width)	Active
CY74FCT2245CTQCT	Texas Instruments	Transceiver, Non-Inverting	3-State	15mA, 12mA	4.75V ~ 5.25V	-40°C ~ 85°C (TA)	20-SSOP (0.154", 3.90mm Width)	Active
CY74FCT2245TQCT	Texas Instruments	Transceiver, Non-Inverting	3-State	15mA, 12mA	4.75V ~ 5.25V	-40°C ~ 85°C (TA)	20-SSOP (0.154", 3.90mm Width)	Active
CY74FCT245ATQCT	Texas Instruments	Transceiver, Non-Inverting	3-State	32mA, 64mA	4.75V ~ 5.25V	-40°C ~ 85°C (TA)	20-SSOP (0.154", 3.90mm Width)	Active

Engineering Selection Recommendations

Direct Footprint Substitutes (20-SSOP Package):

For applications requiring identical PCB footprint compatibility with the PI74FCT245TQEX, select from active parts with matching 20-SSOP packaging:

74FCT245ATQG (Renesas Electronics Corporation) - Active status, identical electrical specifications
74FCT245CTQG (IDT, Integrated Device Technology Inc) - Active status, identical electrical specifications
CY74FCT2245ATQCT (Texas Instruments) - Active status, 5.25V supply, reduced output low current (12mA vs 64mA)
CY74FCT2245CTQCT (Texas Instruments) - Active status, 5.25V supply, reduced output low current (12mA vs 64mA)
CY74FCT2245TQCT (Texas Instruments) - Active status, 5.25V supply, reduced output low current (12mA vs 64mA)
CY74FCT245ATQCT (Texas Instruments) - Active status, enhanced output current capability (32mA, 64mA)

Alternate Package Substitutes (20-TSSOP Package):

For designs permitting package change to 20-TSSOP (0.173", 4.40mm Width):

74FCT245ATPGG (IDT, Integrated Device Technology Inc) - Active status, identical electrical specifications
CY74FCT2245ATPWR (Texas Instruments) - Active status, 5.25V supply, reduced output low current (12mA vs 64mA)

Voltage-Reduced Alternatives (3.3V Logic Systems Only):

For 3.3V logic applications, the 74FCT3245 series provides equivalent functionality at reduced voltage and current:

74FCT3245APGG (Renesas Electronics Corporation) - Active status, 2.7V ~ 3.6V supply, 20-TSSOP package
74FCT3245APGG8 (Renesas Electronics Corporation) - Active status, 2.7V ~ 3.6V supply, 20-TSSOP package

All recommended substitutes maintain ROHS3 compliance and operate across the -40°C to 85°C temperature range.

Frequently Asked Questions (FAQ)

Q: Can I use 74FCT245ATQG as a direct replacement for PI74FCT245TQEX?

A: Yes. The 74FCT245ATQG maintains identical electrical specifications (15mA output high, 64mA output low), operates at 4.75V ~ 5.25V supply voltage, and uses the same 20-SSOP package footprint. Both parts are non-inverting octal bidirectional transceivers with 3-state output and -40°C to 85°C operating temperature range.

Q: What is the difference between 74FCT245 and 74FCT2245 series?

A: The 74FCT2245 series exhibits different output current characteristics. The CY74FCT2245 variants specify 15mA output high and 12mA output low, compared to the PI74FCT245TQEX specification of 15mA output high and 64mA output low. This difference affects drive capability in applications requiring higher sink current. The 74FCT2245 series is suitable for applications with lower current demands.

Q: Can I substitute a 20-TSSOP package part for the 20-SSOP package original?

A: Package substitution requires PCB redesign. The 20-TSSOP package (0.173", 4.40mm Width) has different pitch and dimensions than the 20-SSOP package (0.154", 3.90mm Width). Electrical compatibility is maintained, but physical footprint modification is necessary. Parts such as 74FCT245ATPGG and CY74FCT2245ATPWR are electrically equivalent but require layout changes.

Q: Are the 74FCT3245 parts suitable replacements?

A: The 74FCT3245 series is not suitable for 5.25V applications. These parts operate at 2.7V ~ 3.6V supply voltage with reduced output current (8mA, 24mA). Use 74FCT3245 variants only in 3.3V logic systems. For 5.25V applications, select from the 74FCT245 or 74FCT2245 series.

Q: What is the significance of product status (Active vs. Obsolete)?

A: Active parts are in current production with ongoing manufacturer support, ensuring long-term availability and consistent specifications. The PI74FCT245TQEX is obsolete, meaning production has ended. Active substitutes such as 74FCT245ATQG, 74FCT245CTQG, and CY74FCT245ATQCT provide design continuity and procurement reliability for new designs and production runs.

Q: Do all substitutes meet RoHS3 compliance?

A: All listed substitutes maintain ROHS3 compliance as specified in the provided data. Compliance certification is consistent across manufacturers for this product category.

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