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PI74FCT374ATS Equivalent & Substitute Parts
Part Overview
The PI74FCT374ATS is a D-type flip-flop logic integrated circuit manufactured by Diodes Incorporated, featuring 1 element with 8-bit positive edge triggering in a 20-SOIC package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
The 74FCT374 series provides tri-state, non-inverted output configuration suitable for digital logic applications requiring edge-triggered data storage. Substitution is driven by product availability and the need for active manufacturing status while maintaining electrical and mechanical compatibility.
Substiute Parts
Key Parameters
| Parameter | PI74FCT374ATS (Main Part) |
|---|---|
| Manufacturer | Diodes Incorporated |
| Product Status | Obsolete |
| Package / Case | 20-SOIC (0.295", 7.50mm Width) |
| Type | D-Type Flip-Flop |
| Number of Elements | 1 |
| Number of Bits per Element | 8 |
| Output Type | Tri-State, Non-Inverted |
| Trigger Type | Positive Edge |
| Voltage - Supply | 4.75V ~ 5.25V |
| Max Propagation Delay @ 5V, 50pF | 6.5ns |
| Current - Output High, Low | 15mA, 64mA |
| Current - Quiescent (Iq) | 500 µA |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
| RoHS Status | RoHS non-compliant |
Substitute Part Grouping Explanation
Substitution of the PI74FCT374ATS is determined by the following critical parameters:
Mechanical Compatibility: Package type (20-SOIC), physical dimensions (0.295", 7.50mm Width), and mounting type (Surface Mount) must match or be pin-compatible.
Functional Compatibility: All substitutes must maintain D-type flip-flop architecture with 1 element, 8-bit configuration, positive edge triggering, and tri-state non-inverted output.
Electrical Compatibility: Supply voltage range, propagation delay, output current ratings, and quiescent current must fall within acceptable operating margins for the application.
Product Status: Active or recently discontinued parts are preferred over obsolete classifications to ensure long-term availability.
Substitute parts are grouped into two categories:
- Direct 74FCT Series Substitutes – Maintain identical electrical characteristics and 74FCT series designation
- Alternative Logic Series Substitutes – Different series (74ABT, 74LS) with compatible pinout and function but varying electrical performance
Parameter Comparison
| Part Number | Manufacturer | Product Status | Package | Propagation Delay (ns) | Output Current High/Low (mA) | Quiescent Current (µA) | Supply Voltage (V) | Operating Temp (°C) | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| PI74FCT374ATS | Diodes Inc. | Obsolete | 20-SOIC (7.50mm) | 6.5 @ 5V, 50pF | 15, 64 | 500 | 4.75–5.25 | -40 to 85 | Non-compliant |
| 74FCT374CTSOG | IDT | Active | 20-SOIC (7.50mm) | 5.2 @ 5V, 50pF | 15, 48 | 1000 | 4.5–5.5 | -40 to 85 | Not specified |
| CD74FCT374M | Texas Instruments | Active | 20-SOIC (7.50mm) | 6.6 @ 5V, 50pF | 15, 48 | 8 | 4.75–5.25 | 0 to 70 | ROHS3 Compliant |
| CY74FCT374ATSOC | Texas Instruments | Active | 20-SOIC (7.50mm) | 6.5 @ 50pF | 32, 64 | 200 | 4.75–5.25 | -40 to 85 | ROHS3 Compliant |
| CY74FCT374ATSOCT | Texas Instruments | Active | 20-SOIC (7.50mm) | 6.5 @ 5V, 50pF | 32, 64 | 200 | 4.75–5.25 | -40 to 85 | ROHS3 Compliant |
| CY74FCT374CTSOC | Texas Instruments | Active | 20-SOIC (7.50mm) | 5.2 @ 5V, 50pF | 32, 64 | 200 | 4.75–5.25 | -40 to 85 | ROHS3 Compliant |
| CY74FCT374TSOC | Texas Instruments | Active | 20-SOIC (7.50mm) | 10 @ 5V, 50pF | 32, 64 | 200 | 4.75–5.25 | -40 to 85 | ROHS3 Compliant |
| CY74FCT374TSOCT | Texas Instruments | Discontinued at DiGi Electronics | 20-SOIC (7.50mm) | 10 @ 5V, 50pF | 32, 64 | 200 | 4.75–5.25 | -40 to 85 | ROHS3 Compliant |
| SN74ABT374ADW | Texas Instruments | Active | 20-SOIC (7.50mm) | 5.1 @ 5V, 50pF | 32, 64 | 250 | 4.5–5.5 | -40 to 85 | ROHS3 Compliant |
| SN74ABT374ANSR | Texas Instruments | Active | 20-SO (5.30mm) | 6.6 @ 5V, 50pF | 32, 64 | 250 | 4.5–5.5 | -40 to 85 | ROHS3 Compliant |
| SN74LS374DW | Texas Instruments | Discontinued at DiGi Electronics | 20-SOIC (7.50mm) | 28 @ 5V, 45pF | 2.6, 24 | 40000 | 4.75–5.25 | 0 to 70 | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Substitutes (Highest Compatibility):
74FCT374CTSOG (IDT) and CY74FCT374CTSOC (Texas Instruments) are the closest functional equivalents, maintaining the 74FCT series designation with active product status. Both deliver propagation delays of 5.2ns, superior to the original 6.5ns specification. CY74FCT374CTSOC offers ROHS3 compliance and extended supply voltage range (4.75–5.25V).
Secondary Substitutes (Acceptable with Application Review):
CY74FCT374ATSOC and CY74FCT374ATSOCT maintain identical propagation delay (6.5ns) and operating temperature range (-40°C to 85°C) as the original part. Both feature ROHS3 compliance and higher output current capability (32mA/64mA vs. 15mA/64mA). These are suitable for applications requiring extended temperature operation and higher drive capability.
Alternative Series Substitutes (Performance Trade-offs):
SN74ABT374ADW (Texas Instruments) provides faster propagation delay (5.1ns) and wider supply voltage tolerance (4.5–5.5V) with ROHS3 compliance. The 74ABT series is recommended for applications prioritizing speed and supply voltage margin over exact 74FCT series matching.
SN74LS374DW is not recommended as a primary substitute due to significantly slower propagation delay (28ns), higher quiescent current (40mA), and reduced output current capability. Use only when legacy 74LS compatibility is a design requirement.
Packaging Consideration:
SN74ABT374ANSR uses a narrower 20-SO package (5.30mm width) versus the standard 20-SOIC (7.50mm width). Verify PCB footprint compatibility before selection.
Compliance Status:
All recommended substitutes except 74FCT374CTSOG carry ROHS3 compliance certification, addressing environmental regulatory requirements absent in the original PI74FCT374ATS.
Frequently Asked Questions (FAQ)
Q: Can I directly replace PI74FCT374ATS with any 74FCT374 variant?
A: Yes, all 74FCT374 variants maintain identical pinout, package footprint (20-SOIC 7.50mm), and functional architecture. Electrical parameters such as propagation delay and output current may vary within acceptable margins for most applications. Verify supply voltage range and operating temperature requirements for your specific design.
Q: What is the difference between CY74FCT374ATSOC and CY74FCT374CTSOC?
A: Both are Texas Instruments 74FCT series parts in 20-SOIC packaging. CY74FCT374CTSOC delivers faster propagation delay (5.2ns vs. 6.5ns) and lower quiescent current (200µA vs. 200µA). The "C" temperature grade in CTSOC indicates commercial operating range optimization. Select based on propagation delay requirements and thermal environment.
Q: Is SN74ABT374ADW a suitable replacement for PI74FCT374ATS?
A: Yes, with application verification. The 74ABT series maintains identical pinout and D-type flip-flop function. It offers superior propagation delay (5.1ns) and wider supply voltage range (4.5–5.5V). However, it is a different logic family with different electrical characteristics. Confirm that timing margins and power supply specifications accommodate the 74ABT variant.
Q: Why is SN74LS374DW listed as a substitute if it has much slower performance?
A: SN74LS374DW is included for legacy design compatibility only. The 74LS series is significantly slower (28ns propagation delay) and draws higher quiescent current (40mA). It is suitable only for applications with relaxed timing requirements or designs requiring backward compatibility with existing 74LS-based systems.
Q: Does package width matter when selecting a substitute?
A: Yes. Most substitutes use the standard 20-SOIC package with 7.50mm width, matching the original PI74FCT374ATS footprint. SN74ABT374ANSR uses a narrower 20-SO package (5.30mm width). Verify your PCB footprint design before selecting this variant to avoid assembly issues.
Q: Are all substitute parts RoHS compliant?
A: No. The original PI74FCT374ATS is RoHS non-compliant. Most recommended substitutes (CY74FCT374 variants, SN74ABT374 variants, SN74LS374DW) carry ROHS3 compliance. 74FCT374CTSOG (IDT) does not specify RoHS status. Confirm compliance requirements for your application and supply chain.
Q: What is the impact of higher quiescent current in some substitutes?
A: Quiescent current affects standby power consumption. The original part draws 500µA. Most 74FCT substitutes draw 200–1000µA, while 74ABT variants draw 250µA. For battery-powered or low-power applications, select substitutes with lower quiescent current (CD74FCT374M at 8µA is exceptional). For standard applications, the difference is negligible.
Q: Can I use CY74FCT374ATSOCT in place of CY74FCT374ATSOC?
A: Yes. Both parts are electrically identical with matching propagation delay (6.5ns), output current (32mA/64mA), and operating temperature (-40°C to 85°C). The primary difference is packaging: ATSOC is supplied in Tube, while ATSOCT is supplied in Tape & Reel (TR). Select based on your procurement and assembly process requirements.
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