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PI74FCT245TQE Equivalent & Substitute Parts
Part Overview
The PI74FCT245TQE is a non-inverting octal bidirectional transceiver manufactured by Diodes Incorporated, designed for 5V CMOS logic applications. This device features 1 element with 8 bits per element, 3-state output capability, and operates across a supply voltage range of 4.75V to 5.25V. 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 | PI74FCT245TQE |
| 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 | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the PI74FCT245TQE 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)
- Current - Output High, Low: 15mA, 64mA
Package Compatibility:
- 20-SSOP (0.154", 3.90mm Width) - Direct pin-compatible substitutes
- 20-QSOP - Functionally equivalent with identical pinout
- 20-TSSOP (0.173", 4.40mm Width) - Functionally equivalent with different package footprint
Substitute parts are grouped into two categories:
Category 1: Direct Electrical and Package Equivalents (5V Supply) Parts maintaining identical electrical specifications (15mA/64mA output current) and 5V supply range with compatible packaging.
Category 2: Functional Equivalents with Different Supply Voltage Parts with different supply voltage ranges (2.7V ~ 3.6V) that do not meet the primary 5V specification and require circuit redesign considerations.
Parameter Comparison
| Part Number | Manufacturer | Logic Type | Elements | Bits/Element | Output Type | I_out (H/L) | V_supply | Temp Range | Package | Status |
|---|---|---|---|---|---|---|---|---|---|---|
| PI74FCT245TQE | Diodes Inc. | Non-Inverting | 1 | 8 | 3-State | 15/64 mA | 4.75-5.25V | -40 to 85°C | 20-SSOP | Obsolete |
| 74FCT245ATPGG | IDT | Non-Inverting | 1 | 8 | 3-State | 15/64 mA | 4.75-5.25V | -40 to 85°C | 20-TSSOP | Active |
| 74FCT245ATQG8 | Renesas | Non-Inverting | 1 | 8 | 3-State | 15/64 mA | 4.75-5.25V | -40 to 85°C | 20-QSOP | Active |
| 74FCT245CTQG8 | IDT | Non-Inverting | 1 | 8 | 3-State | 15/64 mA | 4.75-5.25V | -40 to 85°C | 20-QSOP | Active |
| 74FCT3245APGG | Renesas | Non-Inverting | 1 | 8 | 3-State | 8/24 mA | 2.7-3.6V | -40 to 85°C | 20-TSSOP | Active |
| 74FCT3245APGG8 | Renesas | Non-Inverting | 1 | 8 | 3-State | 8/24 mA | 2.7-3.6V | -40 to 85°C | 20-TSSOP | Active |
| CY74FCT2245ATPWR | Texas Instruments | Non-Inverting | 1 | 8 | 3-State | 15/12 mA | 4.75-5.25V | -40 to 85°C | 20-TSSOP | Active |
| CY74FCT2245ATQCT | Texas Instruments | Non-Inverting | 1 | 8 | 3-State | 15/12 mA | 4.75-5.25V | -40 to 85°C | 20-SSOP | Active |
| CY74FCT2245CTQCT | Texas Instruments | Non-Inverting | 1 | 8 | 3-State | 15/12 mA | 4.75-5.25V | -40 to 85°C | 20-SSOP | Active |
| CY74FCT2245TQCT | Texas Instruments | Non-Inverting | 1 | 8 | 3-State | 15/12 mA | 4.75-5.25V | -40 to 85°C | 20-SSOP | Active |
| CY74FCT245ATQCT | Texas Instruments | Non-Inverting | 1 | 8 | 3-State | 32/64 mA | 4.75-5.25V | -40 to 85°C | 20-SSOP | Active |
Engineering Selection Recommendations
For Direct Replacement (5V Supply, Identical Electrical Performance):
The 74FCT245ATQG8 (Renesas) and 74FCT245CTQG8 (IDT) are the primary substitutes, maintaining identical output current specifications (15mA/64mA) and 5V supply voltage range. Both parts are in active production status with ROHS3 compliance and MSL-1 rating. The 20-QSOP package is functionally equivalent to the original 20-SSOP package with identical pinout.
The 74FCT245ATPGG (IDT) provides equivalent electrical performance in a 20-TSSOP package, suitable for applications where package footprint differences are acceptable.
For Alternative Supply Voltage Applications:
The 74FCT3245APGG and 74FCT3245APGG8 (Renesas) operate at 2.7V to 3.6V supply voltage with reduced output current (8mA/24mA). These parts are not direct substitutes for 5V applications and require circuit redesign.
For Modified Output Current Specifications:
The CY74FCT2245 series (Texas Instruments) maintains 5V supply compatibility but features asymmetrical output current (15mA high, 12mA low) compared to the original specification. The CY74FCT245ATQCT provides higher output current capability (32mA/64mA) for applications requiring increased drive strength.
All recommended active-status parts carry ROHS3 compliance and appropriate moisture sensitivity ratings for standard manufacturing processes.
Frequently Asked Questions (FAQ)
Q: Can I use 74FCT3245APGG as a direct replacement for PI74FCT245TQE?
A: No. The 74FCT3245APGG operates at 2.7V to 3.6V supply voltage, while the PI74FCT245TQE requires 4.75V to 5.25V. Additionally, output current specifications differ (8mA/24mA versus 15mA/64mA). This part requires circuit redesign and is not a direct substitute.
Q: What is the difference between 20-SSOP and 20-QSOP packages?
A: Both packages are 20-pin surface mount packages with identical pinout and electrical compatibility. The 20-SSOP (0.154" width) and 20-QSOP are functionally equivalent. The primary difference is package designation; parts marked as 20-QSOP can be used in applications designed for 20-SSOP footprints.
Q: Are CY74FCT2245 parts compatible with PI74FCT245TQE?
A: CY74FCT2245 parts maintain 5V supply voltage compatibility and identical logic function. However, output current specifications differ (15mA/12mA versus 15mA/64mA). These parts are functionally compatible but may not meet applications requiring the full 64mA low-side output current of the original part.
Q: Why is the PI74FCT245TQE marked as obsolete?
A: The PI74FCT245TQE is obsolete due to manufacturer discontinuation. Active-status equivalents from IDT, Renesas, and Texas Instruments provide continued design support and procurement availability.
Q: What does MSL-1 (Unlimited) mean for moisture sensitivity?
A: MSL-1 indicates unlimited shelf life without moisture baking requirements. Parts with MSL-1 rating can be stored indefinitely under standard conditions without special handling, simplifying inventory management and manufacturing processes.
Q: Can I substitute parts with different packaging if electrical specifications match?
A: Yes, provided the pinout is identical and your PCB layout accommodates the different package dimensions. 20-SSOP, 20-QSOP, and 20-TSSOP packages all maintain identical pinout for 74FCT245 series parts, allowing package substitution with appropriate footprint verification.
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