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74FCT574CTSOG8 Equivalent & Substitute Parts
Part Overview
The 74FCT574CTSOG8 is a D-type flip-flop logic integrated circuit manufactured by Renesas Electronics Corporation. This device functions as a single-element, 8-bit positive edge-triggered flip-flop with tri-state, non-inverted outputs in a 20-SOIC surface mount package. The part is currently obsolete, making equivalent substitute parts necessary for ongoing design support, production continuity, and component sourcing.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 74FCT574CTSOG8 |
| Manufacturer | Renesas Electronics Corporation |
| Series | 74FCT |
| 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 |
| Package / Case | 20-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Max Propagation Delay @ V, Max CL | 5.2ns @ 5V, 50pF |
| Current - Output High, Low | 15mA, 48mA |
| Current - Quiescent (Iq) | 1 mA |
| Input Capacitance | 6 pF |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution eligibility for the 74FCT574CTSOG8 is determined by the following critical parameters:
Mandatory Matching Parameters:
- 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
- Package / Case: 20-SOIC (0.295", 7.50mm Width)
- Mounting Type: Surface Mount
Allowable Variation Parameters:
- Voltage - Supply: 4.75V ~ 5.25V (narrower range acceptable; original 4.5V ~ 5.5V)
- Operating Temperature: -40°C ~ 85°C (identical or subset acceptable)
- Max Propagation Delay: Up to 10ns @ 5V, 50pF (original 5.2ns)
- Current - Output High, Low: Up to 64mA output capability (original 15mA, 48mA)
- Current - Quiescent (Iq): Up to 200 µA (original 1 mA)
- Input Capacitance: Up to 10 pF (original 6 pF)
Substitute parts must maintain identical functional architecture, package footprint, and pin configuration. Variations in performance parameters (propagation delay, current ratings, quiescent current) are acceptable provided they do not degrade system-level requirements.
Parameter Comparison
| Parameter | 74FCT574CTSOG8 (Main) | CY74FCT2574CTSOC | CD74FCT374M | CY74FCT374ATSOC | CY74FCT374ATSOCT | CY74FCT374CTSOC | CY74FCT374TSOC | CY74FCT374TSOCT | CY74FCT377ATSOC | CY74FCT574ATSOC | CY74FCT574ATSOCT |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Renesas | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Cypress Semiconductor |
| Type | D-Type | D-Type | D-Type | D-Type | D-Type | D-Type | D-Type | D-Type | D-Type | D-Type | D-Type |
| Number of Bits | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
| Output Type | Tri-State, Non-Inverted | Tri-State, Non-Inverted | Tri-State, Non-Inverted | Tri-State, Non-Inverted | Tri-State, Non-Inverted | Tri-State, Non-Inverted | Tri-State, Non-Inverted | Tri-State, Non-Inverted | Non-Inverted | Tri-State, Non-Inverted | Tri-State, Non-Inverted |
| Package | 20-SOIC | 20-SOIC | 20-SOIC | 20-SOIC | 20-SOIC | 20-SOIC | 20-SOIC | 20-SOIC | 20-SOIC | 20-SOIC | 20-SOIC |
| Voltage - Supply | 4.5V ~ 5.5V | 4.75V ~ 5.25V | 4.75V ~ 5.25V | 4.75V ~ 5.25V | 4.75V ~ 5.25V | 4.75V ~ 5.25V | 4.75V ~ 5.25V | 4.75V ~ 5.25V | 4.75V ~ 5.25V | 4.75V ~ 5.25V | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | 0°C ~ 70°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C |
| Max Propagation Delay @ 5V, 50pF | 5.2ns | 5.2ns | 6.6ns | 6.5ns | 6.5ns | 5.2ns | 10ns | 10ns | 7.2ns | 7.2ns | 6.5ns |
| Current - Output High, Low (mA) | 15, 48 | 15, 12 | 15, 48 | 32, 64 | 32, 64 | 32, 64 | 32, 64 | 32, 64 | 32, 64 | 32, 64 | 64, 32 |
| Current - Quiescent (µA) | 1000 | 200 | 8 | 200 | 200 | 200 | 200 | 200 | 200 | 200 | 200 |
| Input Capacitance (pF) | 6 | 5 | 10 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Discontinued at DiGi Electronics | Active | Active | Active |
Engineering Selection Recommendations
Primary Substitutes (Highest Compatibility):
CY74FCT2574CTSOC and CY74FCT374CTSOC are the most direct substitutes. Both maintain identical propagation delay (5.2ns @ 5V, 50pF), matching the original 74FCT574CTSOG8 performance specification. Both are active products with ROHS3 compliance and MSL 1 rating. CY74FCT2574CTSOC is available in tube packaging with 1799 units in stock, while CY74FCT374CTSOC is available in tube packaging with 1927 units in stock.
Secondary Substitutes (Acceptable Performance Variation):
CY74FCT374ATSOC, CY74FCT374ATSOCT, CY74FCT574ATSOC, and CY74FCT574ATSOCT are active products with acceptable propagation delay (6.5ns @ 5V, 50pF) and enhanced output current capability (32mA/64mA). These parts support extended temperature range (-40°C ~ 85°C) and maintain ROHS3 compliance. CY74FCT574ATSOCT offers the highest inventory availability (23,169 units in bulk packaging).
Limited Substitutes (Performance Degradation):
CD74FCT374M operates within a narrower temperature range (0°C ~ 70°C), restricting use to commercial-grade applications. CY74FCT374TSOC and CY74FCT374TSOCT exhibit increased propagation delay (10ns @ 5V, 50pF), which may impact timing-critical circuits. CY74FCT374TSOCT is discontinued at DiGi Electronics and should be avoided for new designs.
Functional Variant (Output Configuration Difference):
CY74FCT377ATSOC differs in output type (Non-Inverted only, without tri-state capability). This part is suitable only for applications that do not require tri-state output control.
All recommended substitutes maintain identical 20-SOIC package footprint, surface mount configuration, and positive edge-trigger functionality. Selection should prioritize active product status and compliance certifications for production continuity.
Frequently Asked Questions (FAQ)
Q: Can CY74FCT374CTSOC directly replace 74FCT574CTSOG8 in existing designs?
A: Yes. CY74FCT374CTSOC maintains identical propagation delay (5.2ns), output type (tri-state, non-inverted), bit width (8-bit), and package (20-SOIC). Pin configuration and functional behavior are compatible. Both parts are ROHS3 compliant with MSL 1 rating.
Q: What is the difference between 74FCT574 and 74FCT374 base part numbers?
A: The base part numbers indicate different internal logic configurations within the 74FCT family. However, both function as 8-bit D-type flip-flops with tri-state outputs in identical 20-SOIC packages. Substitution is valid when all electrical and mechanical parameters align.
Q: Why do some substitutes have higher output current ratings (32mA/64mA vs. 15mA/48mA)?
A: Enhanced output current capability represents improved performance and does not prevent substitution. Higher current ratings provide greater drive capability for downstream logic, making these parts suitable for applications requiring increased fanout or lower impedance loads.
Q: Is CY74FCT574ATSOCT suitable for designs requiring -40°C to 85°C operation?
A: Yes. CY74FCT574ATSOCT supports the full -40°C to 85°C operating temperature range, matching the original 74FCT574CTSOG8 specification. This part is available in bulk packaging with 23,169 units in stock.
Q: What is the significance of packaging type (Tube vs. Tape & Reel vs. Bulk)?
A: Packaging type affects handling, storage, and automated assembly compatibility. Tube packaging suits manual assembly and smaller quantities. Tape & Reel (TR) packaging is optimized for high-volume automated pick-and-place assembly. Bulk packaging is suitable for large-volume orders. Functional performance is identical across packaging types.
Q: Can CD74FCT374M be used in industrial applications requiring -40°C operation?
A: No. CD74FCT374M operates only within 0°C to 70°C, restricting use to commercial-grade applications. For industrial temperature range (-40°C ~ 85°C), select CY74FCT374ATSOC, CY74FCT374ATSOCT, CY74FCT374CTSOC, CY74FCT374TSOC, CY74FCT574ATSOC, or CY74FCT574ATSOCT.
Q: Why is CY74FCT377ATSOC listed as a substitute if it lacks tri-state output?
A: CY74FCT377ATSOC is a functional variant suitable only for applications that do not require tri-state output control. It maintains 8-bit D-type flip-flop architecture and 20-SOIC packaging but differs in output configuration. Use only if tri-state capability is not required by the circuit design.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original 74FCT574CTSOG8 environmental compliance profile.
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