74LS374P-E Equivalent & Substitute Parts

Part Overview

The 74LS374P-E is a D-Type flip-flop logic integrated circuit manufactured by Renesas Electronics Corporation. This component functions as a single-element, 8-bit positive edge-triggered flip-flop with tri-state, non-inverted outputs in a 20-DIP through-hole package. The device operates at a maximum clock frequency of 50 MHz with a propagation delay of 28 nanoseconds at 5V with 45pF load capacitance.

The 74LS374P-E carries an obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support legacy system maintenance and repairs.

Substiute Parts

74LS374P-E

Renesas Electronics CorporationIn Stock: 74674LS374P-E Datasheet

Current PartRFQ

CY74FCT374ATPC

Texas InstrumentsIn Stock: 1698CY74FCT374ATPC Datasheet

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SN74LS374N

onsemiIn Stock: 3759SN74LS374N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74LS374P-E are selected based on strict electrical and mechanical compatibility criteria. The following parameters determine substitution eligibility:

Critical Matching Parameters:

• Package type: 20-DIP (0.300", 7.62mm) through-hole mounting
• Functional type: D-Type flip-flop, single element, 8-bit configuration
• Output configuration: Tri-state, non-inverted outputs
• Trigger mechanism: Positive edge-triggered
• Supply voltage range: 4.75V ~ 5.25V
• Pin count and pinout compatibility: 20-pin DIP

Performance Parameters:

• Clock frequency capability: minimum 50 MHz
• Propagation delay: maximum 28 nanoseconds at specified conditions
• Output current drive: minimum 24mA high, 2.6mA low
• Quiescent current: maximum 40 mA

Substitute parts must satisfy all critical matching parameters and maintain or exceed performance specifications. Parts that meet these criteria are electrically and mechanically interchangeable within the specified operating conditions.

Parameter Comparison

Engineering Selection Recommendations

CY74FCT374ATPC (Texas Instruments)

The CY74FCT374ATPC is an active-status substitute that meets all critical electrical and mechanical compatibility requirements. This part operates within the required 4.75V to 5.25V supply voltage range and maintains the 20-DIP through-hole package format. The CY74FCT374ATPC delivers superior performance characteristics, including a propagation delay of 6.5 nanoseconds, which is significantly faster than the 28-nanosecond specification of the 74LS374P-E. Output current drive capability is higher at 32mA high and 64mA low. Quiescent current is substantially lower at 200 microamperes. The device carries active product status and ROHS3 compliance certification, supporting long-term design continuity and regulatory compliance requirements.

SN74LS374N (onsemi)

The SN74LS374N is an obsolete-status substitute that provides direct electrical equivalence to the 74LS374P-E. This part shares identical clock frequency (50 MHz), propagation delay (28ns @ 5V, 45pF), supply voltage range (4.75V ~ 5.25V), and quiescent current (40 mA) specifications. The 20-DIP through-hole package and tri-state, non-inverted output configuration ensure mechanical and functional compatibility. However, the SN74LS374N carries RoHS non-compliant status and operates within a narrower temperature range (0°C ~ 70°C) compared to the 74LS374P-E (-20°C ~ 75°C). This part is suitable for legacy system maintenance where regulatory compliance is not a requirement.

Frequently Asked Questions (FAQ)

Q: Can the CY74FCT374ATPC replace the 74LS374P-E in all applications?

A: The CY74FCT374ATPC meets all critical electrical and mechanical compatibility requirements for direct substitution. The faster propagation delay (6.5ns versus 28ns) and lower quiescent current (200µA versus 40mA) represent performance improvements that do not create compatibility issues in standard applications. The device operates within the same supply voltage range and maintains identical pin configuration and functional behavior.

Q: What is the difference between the 74LS374P-E and SN74LS374N?

A: Both devices are electrically equivalent with identical clock frequency, propagation delay, supply voltage, and quiescent current specifications. The primary differences are manufacturer (Renesas versus onsemi), product status (both obsolete), and regulatory compliance. The SN74LS374N operates within a narrower temperature range (0°C ~ 70°C versus -20°C ~ 75°C) and carries RoHS non-compliant status.

Q: Are all substitute parts available in the same 20-DIP package?

A: Yes. Both the CY74FCT374ATPC and SN74LS374N are packaged in 20-DIP (0.300", 7.62mm) through-hole format, identical to the 74LS374P-E. This ensures direct mechanical compatibility with existing printed circuit board layouts and socket configurations.

Q: What does "tri-state, non-inverted output" mean?

A: Tri-state outputs can assume three states: logic high, logic low, or high-impedance (disabled). Non-inverted output means the output logic level directly reflects the stored data state without inversion. All substitute parts maintain this output configuration.

Q: Why is the CY74FCT374ATPC faster than the 74LS374P-E?

A: The CY74FCT374ATPC uses advanced CMOS technology (FCT series) compared to the LS-TTL technology of the 74LS374P-E. This technology difference results in faster propagation delays (6.5ns versus 28ns) and lower power consumption (200µA quiescent current versus 40mA). Both devices remain functionally compatible within standard digital logic applications.

Q: Is RoHS compliance important for my application?

A: RoHS compliance is a regulatory requirement in many jurisdictions and industries. The CY74FCT374ATPC carries ROHS3 compliance certification, while the SN74LS374N does not. For new designs or applications subject to environmental regulations, the CY74FCT374ATPC is the appropriate selection.

Q: Can I use these parts interchangeably on the same circuit board?

A: Yes. All three parts share identical pinout, package format, and functional behavior. They can be used interchangeably provided the application requirements fall within the operating specifications of the selected substitute. The CY74FCT374ATPC offers the broadest operating temperature range (-40°C ~ 85°C) and active product status.