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PI74FCT245ATQ Equivalent & Substitute Parts
Part Overview
The PI74FCT245ATQ 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 currently classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring this functional class.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | PI74FCT245ATQ |
| 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) |
| Product Status | Obsolete |
| RoHS Status | RoHS non-compliant |
Substitute Part Grouping Explanation
Substitution for the PI74FCT245ATQ 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 Levels:
- Direct Package Match: 20-SSOP (0.154", 3.90mm Width) — highest compatibility
- Compatible Package: 20-TSSOP (0.173", 4.40mm Width) — functionally equivalent with minor footprint adjustment
- Voltage Class Variants: 74FCT3245 series operates at 2.7V ~ 3.6V and is not suitable for 5.25V applications
Substitute parts are grouped into two categories: direct equivalents maintaining identical electrical and package specifications, and manufacturer-recommended alternatives with active product status and modern compliance certifications.
Parameter Comparison
| Part Number | Manufacturer | Logic Type | Elements / Bits | Output Type | Current (High/Low) | Voltage Supply | Temp Range | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|
| PI74FCT245ATQ | Diodes Inc. | Non-Inverting | 1 / 8 | 3-State | 15mA / 64mA | 4.75V ~ 5.25V | -40°C ~ 85°C | 20-SSOP | Obsolete | Non-compliant |
| 74FCT245ATQG | Renesas Electronics | Non-Inverting | 1 / 8 | 3-State | 15mA / 64mA | 4.75V ~ 5.25V | -40°C ~ 85°C | 20-SSOP | Active | ROHS3 Compliant |
| 74FCT245ATPGG | IDT | Non-Inverting | 1 / 8 | 3-State | 15mA / 64mA | 4.75V ~ 5.25V | -40°C ~ 85°C | 20-TSSOP | Active | Not specified |
| 74FCT245ATQG8 | Renesas Electronics | Non-Inverting | 1 / 8 | 3-State | 15mA / 64mA | 4.75V ~ 5.25V | -40°C ~ 85°C | 20-SSOP | Active | ROHS3 Compliant |
| 74FCT245CTQG8 | IDT | Non-Inverting | 1 / 8 | 3-State | 15mA / 64mA | 4.75V ~ 5.25V | -40°C ~ 85°C | 20-SSOP | Active | Not specified |
| CY74FCT2245ATPWR | Texas Instruments | Non-Inverting | 1 / 8 | 3-State | 15mA / 12mA | 4.75V ~ 5.25V | -40°C ~ 85°C | 20-TSSOP | Active | ROHS3 Compliant |
| CY74FCT2245ATQCT | Texas Instruments | Non-Inverting | 1 / 8 | 3-State | 15mA / 12mA | 4.75V ~ 5.25V | -40°C ~ 85°C | 20-SSOP | Active | ROHS3 Compliant |
| CY74FCT2245CTQCT | Texas Instruments | Non-Inverting | 1 / 8 | 3-State | 15mA / 12mA | 4.75V ~ 5.25V | -40°C ~ 85°C | 20-SSOP | Active | ROHS3 Compliant |
| CY74FCT2245TQCT | Texas Instruments | Non-Inverting | 1 / 8 | 3-State | 15mA / 12mA | 4.75V ~ 5.25V | -40°C ~ 85°C | 20-SSOP | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Equivalents (Highest Compatibility): The 74FCT245ATQG and 74FCT245ATQG8 from Renesas Electronics provide direct functional and package equivalence to the PI74FCT245ATQ. Both maintain identical electrical specifications, 20-SSOP packaging, and -40°C to 85°C operating range. These parts carry active product status and ROHS3 compliance, making them suitable for new designs and legacy system support.
Package-Compatible Alternatives: The 74FCT245ATPGG (IDT) and 74FCT245CTQG8 (IDT) operate with identical electrical parameters but use the 20-TSSOP package (0.173" width versus 0.154"). This 0.02" footprint difference requires PCB layout adjustment but maintains full functional compatibility.
Output Current Variants: The CY74FCT2245 series from Texas Instruments (ATPWR, ATQCT, CTQCT, TQCT) operates at reduced output low current (12mA versus 64mA) while maintaining 15mA output high current and 5.25V supply voltage. These parts are suitable for applications where lower output current is acceptable and offer ROHS3 compliance with active product status.
Compliance Considerations: The original PI74FCT245ATQ is RoHS non-compliant and obsolete. All recommended substitutes carry either ROHS3 compliance or active product status, supporting modern procurement and environmental requirements.
Frequently Asked Questions (FAQ)
Q: Can I use 74FCT245ATPGG as a direct replacement for PI74FCT245ATQ? A: The 74FCT245ATPGG is functionally equivalent with identical electrical specifications and operating range. The primary difference is the package: 20-TSSOP (0.173" width) versus 20-SSOP (0.154" width). PCB layout modification is required to accommodate the wider package footprint.
Q: What is the difference between 74FCT245 and CY74FCT2245 series? A: Both series maintain 5.25V supply voltage and -40°C to 85°C operation. The CY74FCT2245 variants feature reduced output low current (12mA) compared to the original 64mA specification. This difference is acceptable for most applications but should be verified against circuit load requirements.
Q: Are all substitute parts RoHS compliant? A: The Renesas 74FCT245ATQG, 74FCT245ATQG8, and all Texas Instruments CY74FCT2245 variants carry ROHS3 compliance. The IDT parts (74FCT245ATPGG, 74FCT245CTQG8) do not specify RoHS status in the provided data.
Q: Which substitute offers the best inventory availability? A: The CY74FCT2245ATPWR from Texas Instruments shows the highest inventory level at 19,200 pieces. The 74FCT3245APGG8 from Renesas also maintains substantial stock at 1,098 pieces, though it operates at 3.6V maximum and is not suitable for 5.25V applications.
Q: Can I use 74FCT3245 series as a substitute? A: No. The 74FCT3245 series operates at 2.7V ~ 3.6V supply voltage, which is incompatible with the 4.75V ~ 5.25V requirement of the PI74FCT245ATQ. These parts are designed for lower-voltage logic systems and cannot be used as substitutes.
Q: What packaging options are available for 5.25V equivalents? A: Two package options are available: 20-SSOP (0.154" width) and 20-TSSOP (0.173" width). The 20-SSOP maintains the original footprint and is offered by Renesas (74FCT245ATQG, 74FCT245ATQG8) and Texas Instruments (CY74FCT2245ATQCT, CY74FCT2245CTQCT, CY74FCT2245TQCT). The 20-TSSOP is offered by IDT (74FCT245ATPGG) and Texas Instruments (CY74FCT2245ATPWR).
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