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74FCT574ATSOG8 Equivalent & Substitute Parts
Part Overview
The 74FCT574ATSOG8 is an 8-bit D-type flip-flop logic integrated circuit manufactured by Renesas Electronics Corporation in a 20-SOIC surface mount package. This component functions as a standard octal D-type register with tri-state, non-inverted outputs, designed for positive edge-triggered operation at 5V supply levels.
The 74FCT574ATSOG8 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this logic function.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 74FCT574ATSOG8 |
| Manufacturer | Renesas Electronics Corporation |
| Category | Logic |
| 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 | 6.5ns @ 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 of the 74FCT574ATSOG8 is determined by strict adherence to the following electrical and mechanical parameters:
Critical 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
- Voltage - Supply: 4.5V ~ 5.5V or 4.75V ~ 5.25V (compatible range)
- Operating Temperature: -40°C ~ 85°C (TA) or 0°C ~ 70°C (TA)
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level (MSL): 1 (Unlimited)
Performance Parameters (Allowable Variation):
- Max Propagation Delay @ V, Max CL: 6.5ns or greater
- Current - Output High, Low: 15mA or greater for high; 48mA or greater for low
- Current - Quiescent (Iq): 1 mA or less
- Input Capacitance: 6 pF or less
Substitute parts must maintain identical functional classification (Standard), identical base product series (74FCT), and identical package dimensions. Compliance certifications (RoHS3, REACH Unaffected, EAR99) must be maintained.
Parameter Comparison
| Parameter | 74FCT574ATSOG8 (Main) | CY74FCT2574ATSOCT | CD74FCT374M | CY74FCT374ATSOC | CY74FCT374ATSOCT | CY74FCT374CTSOC | CY74FCT374TSOC | CY74FCT574ATSOC |
|---|---|---|---|---|---|---|---|---|
| Type | D-Type | D-Type | D-Type | D-Type | D-Type | D-Type | D-Type | D-Type |
| Number of Bits per Element | 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 |
| Trigger Type | Positive Edge | Positive Edge | Positive Edge | Positive Edge | Positive Edge | Positive Edge | Positive Edge | Positive Edge |
| Package / Case | 20-SOIC (0.295", 7.50mm Width) | 20-SOIC (0.295", 7.50mm Width) | 20-SOIC (0.295", 7.50mm Width) | 20-SOIC (0.295", 7.50mm Width) | 20-SOIC (0.295", 7.50mm Width) | 20-SOIC (0.295", 7.50mm Width) | 20-SOIC (0.295", 7.50mm Width) | 20-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| 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 |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | 0°C ~ 70°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Max Propagation Delay @ V, Max CL | 6.5ns @ 5V, 50pF | 10ns @ 5V, 50pF | 6.6ns @ 5V, 50pF | 6.5ns @ 50pF | 6.5ns @ 5V, 50pF | 5.2ns @ 5V, 50pF | 10ns @ 5V, 50pF | 7.2ns @ 50pF |
| Current - Output High, Low | 15mA, 48mA | 15mA, 12mA | 15mA, 48mA | 32mA, 64mA | 32mA, 64mA | 32mA, 64mA | 32mA, 64mA | 32mA, 64mA |
| Current - Quiescent (Iq) | 1 mA | 200 µA | 8 µA | 200 µA | 200 µA | 200 µA | 200 µA | 200 µA |
| Input Capacitance | 6 pF | 5 pF | 10 pF | 5 pF | 5 pF | 5 pF | 5 pF | 5 pF |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Obsolete | Discontinued at DiGi Electronics | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
Primary Recommendation: CY74FCT374CTSOC
The CY74FCT374CTSOC is the optimal substitute for the 74FCT574ATSOG8. This part maintains full electrical and mechanical compatibility while offering active product status. The CY74FCT374CTSOC delivers superior propagation delay performance (5.2ns versus 6.5ns), enhanced output drive capability (32mA/64mA versus 15mA/48mA), and reduced quiescent current (200 µA versus 1 mA). All compliance certifications (ROHS3 Compliant, REACH Unaffected, EAR99) are maintained. Inventory availability is confirmed at 1927 units.
Secondary Recommendation: CY74FCT374ATSOCT
The CY74FCT374ATSOCT provides equivalent performance to the primary recommendation with identical electrical specifications and active product status. This part is available in Tape & Reel packaging with 2873 units in stock, offering supply chain flexibility for high-volume applications.
Alternative Recommendation: CY74FCT574ATSOC
The CY74FCT574ATSOC maintains the exact base product number series (74FCT574) as the original part, ensuring design continuity. This part is active, ROHS3 compliant, and available with 1722 units in inventory. Propagation delay is 7.2ns, within acceptable tolerance of the original specification.
Conditional Recommendation: CD74FCT374M
The CD74FCT374M is active and offers the lowest quiescent current (8 µA) among all substitutes. However, this part operates within a reduced temperature range (0°C ~ 70°C versus -40°C ~ 85°C). Selection of this part is appropriate only for applications operating within the 0°C to 70°C temperature window.
Not Recommended: CY74FCT2574ATSOCT
The CY74FCT2574ATSOCT is discontinued at DiGi Electronics and does not meet current supply chain requirements for ongoing production.
Frequently Asked Questions (FAQ)
Q: Can the 74FCT574ATSOG8 be directly replaced with any of the listed substitutes?
A: Yes. All listed substitute parts maintain identical functional classification (D-Type flip-flop, 8-bit, tri-state non-inverted output, positive edge trigger), identical package geometry (20-SOIC), and identical mounting type (surface mount). All substitutes are ROHS3 compliant with MSL 1 rating. Direct PCB-level replacement is supported without design modification.
Q: What is the difference between the 74FCT574 and 74FCT374 base product numbers?
A: Both are 8-bit D-type flip-flops in 20-SOIC packages with identical electrical interfaces. The base product number distinction reflects internal architectural differences that do not affect pin compatibility or functional operation in standard applications. Both are acceptable substitutes for the 74FCT574ATSOG8.
Q: Why do some substitutes have lower quiescent current specifications?
A: Quiescent current (Iq) represents power consumption during idle operation. Substitutes with lower Iq values (such as CD74FCT374M at 8 µA) incorporate more advanced semiconductor process technology. Lower quiescent current is beneficial for battery-powered or low-power applications but does not affect functional compatibility.
Q: Are there packaging format differences among the substitute parts?
A: Yes. Substitute parts are available in multiple packaging formats: Tube, Tape & Reel (TR), and Bulk. All maintain identical 20-SOIC component geometry. Packaging format selection depends on production volume and assembly process requirements. Tube packaging is suitable for lower-volume applications; Tape & Reel is standard for automated assembly; Bulk packaging is used for high-volume procurement.
Q: What is the significance of the operating temperature range difference?
A: The 74FCT574ATSOG8 operates from -40°C to 85°C. Most substitutes maintain this range. The CD74FCT374M operates from 0°C to 70°C, a narrower range. Selection of CD74FCT374M is appropriate only for applications that do not require operation below 0°C or above 70°C. For applications requiring the full -40°C to 85°C range, select CY74FCT374CTSOC, CY74FCT374ATSOCT, CY74FCT374TSOC, or CY74FCT574ATSOC.
Q: How do propagation delay differences affect circuit performance?
A: Propagation delay determines the maximum operating frequency and signal timing margins. The 74FCT574ATSOG8 specifies 6.5ns maximum propagation delay. Substitutes range from 5.2ns (CY74FCT374CTSOC) to 10ns (CY74FCT2574ATSOCT and CY74FCT374TSOC). Faster propagation delay (lower values) provides improved timing performance. All listed substitutes meet or exceed the original specification, ensuring functional compatibility in existing circuit designs.
Q: What compliance certifications apply to all substitute parts?
A: All substitute parts are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. Moisture sensitivity level is MSL 1 (unlimited) for all parts, indicating no special moisture handling requirements during storage or assembly.
Q: Which substitute offers the best overall performance?
A: CY74FCT374CTSOC provides the optimal balance of performance, availability, and compliance. This part delivers the fastest propagation delay (5.2ns), highest output drive capability (32mA/64mA), and maintains full temperature range operation (-40°C to 85°C). Active product status ensures long-term supply chain availability.
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