PI74FCT245CTQE Equivalent & Substitute Parts

Part Overview

The PI74FCT245CTQE 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 system support and new designs requiring this functional class.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI74FCT245CTQE
Manufacturer	Diodes Incorporated
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)
Supplier Device Package	20-QSOP
Base Product Number	74FCT245
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the PI74FCT245CTQE is determined by strict alignment of the following electrical and mechanical 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
Base Product Number: 74FCT245 or 74FCT2245 series

Secondary Compatibility Factors:

Package / Case: 20-SSOP, 20-QSOP, or 20-TSSOP (all 20-pin surface mount packages)
Current - Output High, Low: Must meet or exceed 15mA high and 64mA low specifications
RoHS Status: ROHS3 Compliant preferred for regulatory alignment
Product Status: Active status preferred for long-term availability

Substitute parts are grouped into two categories: direct equivalents (matching all primary criteria) and functional alternatives (meeting electrical requirements with package variations).

Parameter Comparison

Part Number	Manufacturer	Logic Type	Output Current (High/Low)	Voltage Supply	Package	Product Status	Base Series
PI74FCT245CTQE	Diodes Incorporated	Transceiver, Non-Inverting	15mA / 64mA	4.75V ~ 5.25V	20-QSOP	Obsolete	74FCT245
CY74FCT245CTQCT	Texas Instruments	Transceiver, Non-Inverting	32mA / 64mA	4.75V ~ 5.25V	20-SSOP	Active	74FCT245
74FCT245ATPGG	IDT, Integrated Device Technology Inc	Transceiver, Non-Inverting	15mA / 64mA	4.75V ~ 5.25V	20-TSSOP	Active	74FCT245
74FCT245ATQG8	Renesas Electronics Corporation	Transceiver, Non-Inverting	15mA / 64mA	4.75V ~ 5.25V	20-QSOP	Active	74FCT245
74FCT245CTQG8	IDT, Integrated Device Technology Inc	Transceiver, Non-Inverting	15mA / 64mA	4.75V ~ 5.25V	20-QSOP	Active	74FCT245
74FCT3245APGG	Renesas Electronics Corporation	Transceiver, Non-Inverting	8mA / 24mA	2.7V ~ 3.6V	20-TSSOP	Active	74FCT3245
74FCT3245APGG8	Renesas Electronics Corporation	Transceiver, Non-Inverting	8mA / 24mA	2.7V ~ 3.6V	20-TSSOP	Active	74FCT3245
CY74FCT2245ATPWR	Texas Instruments	Transceiver, Non-Inverting	15mA / 12mA	4.75V ~ 5.25V	20-TSSOP	Active	74FCT2245
CY74FCT2245ATQCT	Texas Instruments	Transceiver, Non-Inverting	15mA / 12mA	4.75V ~ 5.25V	20-SSOP	Active	74FCT2245
CY74FCT2245CTQCT	Texas Instruments	Transceiver, Non-Inverting	15mA / 12mA	4.75V ~ 5.25V	20-SSOP	Active	74FCT2245
CY74FCT2245TQCT	Texas Instruments	Transceiver, Non-Inverting	15mA / 12mA	4.75V ~ 5.25V	20-SSOP	Active	74FCT2245

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

Parts 74FCT245ATQG8 and 74FCT245CTQG8 provide the closest functional match to PI74FCT245CTQE. Both are active products from established manufacturers (Renesas and IDT respectively), maintain identical electrical specifications (15mA/64mA output current, 4.75V–5.25V supply), and operate across the same temperature range. The 20-QSOP package matches the original supplier device package specification. Both parts carry ROHS3 compliance and MSL-1 ratings, ensuring regulatory alignment and handling compatibility.

Secondary Substitutes (Package Variants):

CY74FCT245CTQCT from Texas Instruments and 74FCT245ATPGG from IDT offer active product status with matching electrical performance. CY74FCT245CTQCT uses a 20-SSOP package (0.154" width, identical to QSOP footprint dimensions) and provides higher output high current (32mA). 74FCT245ATPGG uses a 20-TSSOP package (0.173" width) and maintains the original 15mA/64mA current specification. Both are suitable where PCB layout accommodates the package variation.

Extended Substitutes (Functional Alternatives):

CY74FCT2245 series parts (ATPWR, ATQCT, CTQCT, TQCT) from Texas Instruments maintain 5.25V supply compatibility and active product status but feature the 74FCT2245 base series with reduced output low current (12mA versus 64mA). These are applicable only where the lower sink current meets system requirements. The 74FCT3245 series (APGG, APGG8) operates at reduced voltage (2.7V–3.6V) and current levels, making them unsuitable as direct replacements for 5.25V applications.

Frequently Asked Questions (FAQ)

Q: Can I use CY74FCT245CTQCT as a direct replacement for PI74FCT245CTQE?

A: Yes. CY74FCT245CTQCT is a direct functional equivalent. It maintains the same logic type (non-inverting transceiver), element count (1 element, 8 bits), output type (3-state), supply voltage (4.75V–5.25V), and operating temperature range (-40°C to 85°C). The 20-SSOP package has identical 0.154" width to the original 20-QSOP, ensuring PCB compatibility. Output current specifications exceed the original (32mA high versus 15mA, 64mA low maintained), providing enhanced performance margin.

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

A: Both are non-inverting octal bidirectional transceivers with identical logic function and pin count. The primary difference is output low current: 74FCT245 parts deliver 64mA, while 74FCT2245 parts deliver 12mA. The 74FCT2245 series is suitable only for applications where reduced sink current is acceptable. Supply voltage and operating temperature ranges remain identical (4.75V–5.25V, -40°C to 85°C).

Q: Can I substitute a 74FCT3245 part for the PI74FCT245CTQE?

A: No. The 74FCT3245 series operates at 2.7V–3.6V supply voltage, which is incompatible with the original 4.75V–5.25V specification. Additionally, output current is significantly reduced (8mA high, 24mA low). This part is designed for low-voltage applications and cannot replace the original in 5V systems.

Q: Are there package compatibility considerations when selecting a substitute?

A: The original PI74FCT245CTQE uses a 20-QSOP package (0.154" width). Direct substitutes include 20-QSOP (74FCT245ATQG8, 74FCT245CTQG8) and 20-SSOP (CY74FCT245CTQCT, CY74FCT2245 series), which share identical 0.154" width and are PCB-compatible. The 20-TSSOP package (0.173" width) used by 74FCT245ATPGG and 74FCT3245 series requires PCB layout verification due to increased width. All packages are surface mount with identical pin pitch and height specifications.

Q: Why is the original PI74FCT245CTQE marked as obsolete?

A: Obsolete status indicates the manufacturer (Diodes Incorporated) has discontinued production. Active substitutes from Texas Instruments, Renesas, and IDT ensure continued availability and supply chain continuity. All recommended substitutes maintain identical or superior electrical performance and regulatory compliance (ROHS3).

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

A: MSL-1 (unlimited shelf life) and MSL-2 (1-year shelf life) indicate moisture sensitivity during storage and handling. The original part carries MSL-1. Substitutes with MSL-1 (74FCT245ATQG8, 74FCT245CTQG8, 74FCT3245 series, CY74FCT2245TQCT) require no special moisture control. Substitutes with MSL-2 (CY74FCT245CTQCT, CY74FCT2245ATQCT, CY74FCT2245ATQCT, CY74FCT2245CTQCT) require moisture-controlled storage and handling per IPC-A-610 standards.

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