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74FCT245CTPYG Equivalent & Substitute Parts
Part Overview
The 74FCT245CTPYG is a non-inverting transceiver logic IC manufactured by Renesas Electronics Corporation, featuring 1 element with 8 bits per element and 3-state output capability. This component operates within the 4.75V to 5.25V supply voltage range and is rated for -40°C to 85°C operating temperature. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 74FCT245CTPYG |
| Manufacturer | Renesas Electronics Corporation |
| 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 (0.209", 5.30mm Width) |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the 74FCT245CTPYG is determined by the following critical parameters:
- 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
- RoHS Status: ROHS3 Compliant
Substitute parts are grouped into two categories based on base product number and output current specifications:
Category 1: 74FCT245 Base Series - Parts with matching 15mA/64mA output current specifications and 74FCT245 base product number.
Category 2: 74FCT2245 Base Series - Parts with 15mA/12mA or 32mA/64mA output current specifications and 74FCT2245 base product number. These represent functional equivalents with different current drive characteristics.
All substitute parts maintain identical logic functionality, voltage supply range, operating temperature range, and RoHS3 compliance status.
Parameter Comparison
| Part Number | Manufacturer | Base Product | Logic Type | Elements / Bits | Output Type | Current High/Low (mA) | Voltage Supply | Temp Range | Package | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|
| 74FCT245CTPYG | Renesas | 74FCT245 | Non-Inverting | 1 / 8 | 3-State | 15 / 64 | 4.75V ~ 5.25V | -40°C ~ 85°C | 20-SSOP (5.30mm) | Obsolete |
| 74FCT245ATQG | Renesas | 74FCT245 | Non-Inverting | 1 / 8 | 3-State | 15 / 64 | 4.75V ~ 5.25V | -40°C ~ 85°C | 20-QSOP (3.90mm) | Active |
| CY74FCT2245ATPWR | Texas Instruments | 74FCT2245 | Non-Inverting | 1 / 8 | 3-State | 15 / 12 | 4.75V ~ 5.25V | -40°C ~ 85°C | 20-TSSOP (4.40mm) | Active |
| CY74FCT2245ATQCT | Texas Instruments | 74FCT2245 | Non-Inverting | 1 / 8 | 3-State | 15 / 12 | 4.75V ~ 5.25V | -40°C ~ 85°C | 20-SSOP (3.90mm) | Active |
| CY74FCT2245CTQCT | Texas Instruments | 74FCT2245 | Non-Inverting | 1 / 8 | 3-State | 15 / 12 | 4.75V ~ 5.25V | -40°C ~ 85°C | 20-SSOP (3.90mm) | Active |
| CY74FCT2245TQCT | Texas Instruments | 74FCT2245 | Non-Inverting | 1 / 8 | 3-State | 15 / 12 | 4.75V ~ 5.25V | -40°C ~ 85°C | 20-SSOP (3.90mm) | Active |
| CY74FCT245ATQCT | Texas Instruments | 74FCT245 | Non-Inverting | 1 / 8 | 3-State | 32 / 64 | 4.75V ~ 5.25V | -40°C ~ 85°C | 20-SSOP (3.90mm) | Active |
| CY74FCT245CTQCT | Texas Instruments | 74FCT245 | Non-Inverting | 1 / 8 | 3-State | 32 / 64 | 4.75V ~ 5.25V | -40°C ~ 85°C | 20-SSOP (3.90mm) | Active |
| CY74FCT245DTQCT | Texas Instruments | 74FCT245 | Non-Inverting | 1 / 8 | 3-State | 32 / 64 | 4.75V ~ 5.25V | -40°C ~ 85°C | 20-SSOP (3.90mm) | Discontinued at DiGi Electronics |
| CY74FCT245TQCT | Texas Instruments | 74FCT245 | Non-Inverting | 1 / 8 | 3-State | 32 / 64 | 4.75V ~ 5.25V | -40°C ~ 85°C | 20-SSOP (3.90mm) | Active |
Engineering Selection Recommendations
Primary Recommendation: 74FCT245ATQG
The 74FCT245ATQG from Renesas Electronics is the manufacturer-recommended direct substitute. It maintains identical electrical specifications (15mA/64mA output current) and operating parameters as the original 74FCT245CTPYG. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating. The primary difference is package format (20-QSOP vs. 20-SSOP), which requires PCB layout adjustment but provides equivalent electrical performance.
Secondary Recommendations: CY74FCT245ATQCT and CY74FCT245CTQCT
Texas Instruments CY74FCT245ATQCT and CY74FCT245CTQCT offer active product status with higher output current drive (32mA/64mA) compared to the original specification (15mA/64mA). These parts are suitable for applications requiring increased current sourcing capability while maintaining all other electrical and thermal specifications. Both parts are available in 20-SSOP packaging matching the original footprint width (3.90mm).
Alternative Options: CY74FCT2245 Series
The CY74FCT2245 series (ATPWR, ATQCT, CTQCT, TQCT) represents functional equivalents with reduced output low current (12mA vs. 64mA). These parts are appropriate for applications where lower output current is acceptable and provide active product status with established supply availability.
Avoid: CY74FCT245DTQCT
This part is discontinued at DiGi Electronics and should not be selected for new designs despite active inventory status.
Frequently Asked Questions (FAQ)
Q: Can I use 74FCT245ATQG as a direct replacement for 74FCT245CTPYG?
A: Yes, electrically and functionally. The 74FCT245ATQG maintains identical logic type, element count, bit width, output type, voltage supply range, and operating temperature. The package format differs (20-QSOP vs. 20-SSOP), requiring PCB layout modification but providing equivalent electrical performance.
Q: What is the difference between 74FCT245 and 74FCT2245 base series?
A: Both are non-inverting transceivers with identical logic functionality and pin counts. The 74FCT2245 series offers variants with reduced output low current (12mA) compared to standard 74FCT245 specifications (64mA). Selection depends on application current requirements.
Q: Why do some substitutes have higher output current (32mA/64mA) than the original (15mA/64mA)?
A: Higher output current specifications indicate greater current drive capability. Parts with 32mA/64mA are suitable for applications requiring increased sourcing current while maintaining backward compatibility with designs specified for 15mA/64mA.
Q: Are all substitute parts ROHS3 compliant?
A: Yes, all listed substitute parts maintain ROHS3 compliance status matching the original 74FCT245CTPYG specification.
Q: What packaging options are available for substitutes?
A: Substitute parts are available in three package formats: 20-SSOP (3.90mm width), 20-QSOP (3.90mm width), and 20-TSSOP (4.40mm width). The original 74FCT245CTPYG uses 20-SSOP with 5.30mm width. Verify PCB footprint compatibility before selection.
Q: Which substitute has the best long-term availability?
A: CY74FCT245ATQCT, CY74FCT245CTQCT, and CY74FCT245TQCT from Texas Instruments show active product status with substantial inventory levels (2260, 3800, and 1559 units respectively), indicating established supply chains suitable for production designs.
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