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PI74FCT2245CTQE Equivalent & Substitute Parts
Part Overview
The PI74FCT2245CTQE 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.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | PI74FCT2245CTQE |
| 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 PI74FCT2245CTQE 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: 20-SSOP or 20-QSOP (0.154", 3.90mm Width)
Secondary Substitution Criteria:
- Current - Output High, Low: 15mA minimum for high output, 64mA minimum for low output
- RoHS3 Compliance
- MSL rating of 1 or 2
Substitute parts are grouped into two categories based on voltage supply range:
Category 1 - 5.25V Supply (Direct Substitutes): Parts maintaining 4.75V ~ 5.25V supply voltage with identical or superior output current ratings. These include 74FCT245 and 74FCT2245 base part numbers from active manufacturers.
Category 2 - 3.6V Supply (Functional Alternatives): Parts with 2.7V ~ 3.6V supply voltage and reduced output current ratings. These are suitable only when lower voltage operation is acceptable in the application.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Voltage - Supply | Current - Output High, Low | Package / Case | RoHS Status | MSL |
|---|---|---|---|---|---|---|---|
| PI74FCT2245CTQE | Diodes Incorporated | Obsolete | 4.75V ~ 5.25V | 15mA, 64mA | 20-SSOP (0.154", 3.90mm) | ROHS3 Compliant | 1 |
| 74FCT245ATPGG | IDT | Active | 4.75V ~ 5.25V | 15mA, 64mA | 20-TSSOP (0.173", 4.40mm) | Not specified | Not specified |
| 74FCT245ATQG8 | Renesas Electronics | Active | 4.75V ~ 5.25V | 15mA, 64mA | 20-SSOP (0.154", 3.90mm) | ROHS3 Compliant | 1 |
| 74FCT245CTQG8 | IDT | Active | 4.75V ~ 5.25V | 15mA, 64mA | 20-SSOP (0.154", 3.90mm) | Not specified | Not specified |
| 74FCT3245APGG | Renesas Electronics | Active | 2.7V ~ 3.6V | 8mA, 24mA | 20-TSSOP (0.173", 4.40mm) | ROHS3 Compliant | 1 |
| 74FCT3245APGG8 | Renesas Electronics | Active | 2.7V ~ 3.6V | 8mA, 24mA | 20-TSSOP (0.173", 4.40mm) | ROHS3 Compliant | 1 |
| CY74FCT2245ATPWR | Texas Instruments | Active | 4.75V ~ 5.25V | 15mA, 12mA | 20-TSSOP (0.173", 4.40mm) | ROHS3 Compliant | 1 |
| CY74FCT2245ATQCT | Texas Instruments | Active | 4.75V ~ 5.25V | 15mA, 12mA | 20-SSOP (0.154", 3.90mm) | ROHS3 Compliant | 2 |
| CY74FCT2245CTQCT | Texas Instruments | Active | 4.75V ~ 5.25V | 15mA, 12mA | 20-SSOP (0.154", 3.90mm) | ROHS3 Compliant | 2 |
| CY74FCT2245TQCT | Texas Instruments | Active | 4.75V ~ 5.25V | 15mA, 12mA | 20-SSOP (0.154", 3.90mm) | ROHS3 Compliant | 1 |
| CY74FCT245ATQCT | Texas Instruments | Active | 4.75V ~ 5.25V | 32mA, 64mA | 20-SSOP (0.154", 3.90mm) | ROHS3 Compliant | 2 |
Engineering Selection Recommendations
For Direct Pin-Compatible Replacement (20-SSOP Package, 5.25V Supply):
74FCT245ATQG8 (Renesas Electronics) and 74FCT245CTQG8 (IDT) are active products maintaining identical package geometry, voltage supply range, and output current specifications. Both are ROHS3 compliant with MSL rating of 1, ensuring compatibility with the original PI74FCT2245CTQE specifications.
CY74FCT2245ATQCT, CY74FCT2245CTQCT, and CY74FCT2245TQCT (Texas Instruments) provide active alternatives in the same 20-SSOP package with ROHS3 compliance. Output low current is reduced to 12mA; verify application tolerance for this parameter.
For Package-Flexible Designs (20-TSSOP Package, 5.25V Supply):
74FCT245ATPGG (IDT) and CY74FCT2245ATPWR (Texas Instruments) are active products in the wider 20-TSSOP package format. Both maintain 4.75V ~ 5.25V supply voltage and support the required 15mA output high current. CY74FCT2245ATPWR is ROHS3 compliant with MSL 1.
For Lower Voltage Applications Only (2.7V ~ 3.6V Supply):
74FCT3245APGG and 74FCT3245APGG8 (Renesas Electronics) are active products suitable only when the application can operate at reduced voltage levels. Output current is reduced to 8mA high and 24mA low. These parts are not substitutes for 5.25V supply applications.
Compliance Considerations:
All recommended active substitutes maintain ROHS3 compliance and unlimited or 1-year moisture sensitivity ratings, ensuring compatibility with standard manufacturing and storage practices.
Frequently Asked Questions (FAQ)
Q: Can I use 74FCT3245APGG as a direct replacement for PI74FCT2245CTQE?
A: No. The 74FCT3245APGG operates at 2.7V ~ 3.6V supply voltage, while the PI74FCT2245CTQE requires 4.75V ~ 5.25V. Additionally, output current is reduced to 8mA high and 24mA low. Use only if your application supports lower voltage operation and reduced drive current.
Q: What is the difference between 20-SSOP and 20-TSSOP packages?
A: Both are 20-pin surface mount packages. The 20-SSOP has a 0.154" (3.90mm) width, while the 20-TSSOP has a 0.173" (4.40mm) width. PCB layout and footprint design must accommodate the specific package width. Parts in different packages are not pin-compatible without board redesign.
Q: Why do some substitutes show lower output low current (12mA vs 64mA)?
A: Output current specifications vary by manufacturer and part number within the 74FCT series. Verify that your application can operate with the reduced 12mA output low current before selecting these parts. Higher current parts like CY74FCT245ATQCT (32mA, 64mA) provide closer matching to the original specification.
Q: Are all substitute parts ROHS3 compliant?
A: All recommended active substitutes are ROHS3 compliant. The original PI74FCT2245CTQE is also ROHS3 compliant, ensuring regulatory consistency across substitution options.
Q: What does MSL rating mean for component selection?
A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to ambient conditions before soldering. MSL 1 (Unlimited) allows indefinite storage without special handling. MSL 2 (1 Year) requires controlled storage conditions. Both ratings are acceptable for standard manufacturing environments.
Q: Can I substitute based on base part number alone (74FCT245 vs 74FCT2245)?
A: No. While both are non-inverting transceivers in the 74FCT series, verify all electrical parameters including voltage supply range, output current ratings, and package type. The suffix letters and numbers in the full part number specify these critical differences.
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