74AC374SCX Equivalent & Substitute Parts

Part Overview

The 74AC374SCX is a D-Type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit capacity and positive edge triggering. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. The part operates across a 2V to 6V supply range with tri-state, non-inverted outputs suitable for standard logic applications requiring edge-triggered data storage.

Substiute Parts

74AC374SCX

onsemiIn Stock: 189374AC374SCX Datasheet

Current PartRFQ

MC74AC374DWR2G

onsemiIn Stock: 3778MC74AC374DWR2G Datasheet

Parametric EquivalentRFQ

SN74AC374DW

Texas InstrumentsIn Stock: 1972SN74AC374DW Datasheet

DirectRFQ

SN74AC374DWR

Texas InstrumentsIn Stock: 2160SN74AC374DWR Datasheet

DirectRFQ

SN74AC574DWR

Texas InstrumentsIn Stock: 3871SN74AC574DWR Datasheet

DirectRFQ

74AHC374D,118

Nexperia USA Inc.In Stock: 117174AHC374D,118 Datasheet

SimilarRFQ

CD74AC374M

Harris CorporationIn Stock: 2098CD74AC374M Datasheet

SimilarRFQ

CD74AC374M96

Texas InstrumentsIn Stock: 1428CD74AC374M96 Datasheet

SimilarRFQ

MC74AC374DWG

onsemiIn Stock: 984MC74AC374DWG Datasheet

SimilarRFQ

SN74AC374NSR

Texas InstrumentsIn Stock: 4151SN74AC374NSR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74AC374SCX is determined by the following critical parameters:

• Logic Function: D-Type flip-flop with 1 element, 8-bit configuration, positive edge trigger
• Output Characteristics: Tri-state, non-inverted outputs
• Electrical Performance: Clock frequency minimum 150 MHz, propagation delay ≤ 9.5 ns @ 5V/50pF
• Supply Voltage: 2V to 6V operating range
• Output Drive Capability: 24 mA minimum (high and low)
• Package Compatibility: 20-SOIC form factor with 0.295" (7.50mm) width
• Thermal Range: -40°C to 85°C operating temperature

Parts are classified into three substitution categories:

Parametric Equivalent: Identical electrical and functional specifications with different product status or packaging.

Direct Manufacturer Equivalent: Same base part number from alternative manufacturers with verified electrical compatibility.

Similar Alternative: Related part numbers within the same logic family offering comparable performance with minor parameter variations.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74AC374DWR (Texas Instruments, Active Status)

This part provides direct functional equivalence with active product status, ROHS3 compliance, and superior propagation delay performance (8.0 ns versus 9.5 ns). The part is available in Cut Tape and Digi-Reel packaging with confirmed inventory.

Secondary Recommendation: MC74AC374DWR2G (onsemi, Active Status)

This parametric equivalent maintains identical electrical specifications to the original 74AC374SCX while offering active product status and ROHS3 compliance. Quiescent current is reduced to 8 µA, providing improved power efficiency. Available in Tape & Reel packaging.

Alternative for Cost-Sensitive Applications: SN74AC574DWR (Texas Instruments, Active Status)

This part offers superior propagation delay (6.0 ns) and lower quiescent current (4 µA) with active product status and ROHS3 compliance. Clock frequency remains within acceptable range at 153 MHz. Suitable for applications where performance headroom is beneficial.

Consideration for Extended Temperature Range: CD74AC374M96 (Texas Instruments, Active Status)

This part extends the operating temperature range to -55°C to 125°C and supports lower supply voltages (1.5V minimum). However, propagation delay increases to 15.1 ns and clock frequency reduces to 110 MHz. Selection requires verification that timing margins remain acceptable.

Not Recommended: 74AHC374D,118 (Nexperia USA Inc.)

While active and ROHS3 compliant, this part exhibits reduced output drive capability (8 mA versus 24 mA) and lower clock frequency (120 MHz). Supply voltage range is also restricted to 2V–5.5V. Substitution requires circuit redesign validation.

Frequently Asked Questions (FAQ)

Q: Can SN74AC374NSR be used as a direct replacement for 74AC374SCX?

A: SN74AC374NSR is electrically equivalent but uses a narrower 20-SOIC package (5.30mm width versus 7.50mm). Physical board layout compatibility must be verified before substitution. Electrical performance is identical.

Q: What is the primary difference between MC74AC374DWR2G and the original 74AC374SCX?

A: Both parts are electrically identical with 155 MHz clock frequency and 9.5 ns propagation delay. The key difference is product status: MC74AC374DWR2G is active with ROHS3 compliance, while 74AC374SCX is obsolete. Quiescent current is lower in the onsemi part (8 µA versus 40 µA).

Q: Is SN74AC574DWR a suitable substitute despite the different base part number?

A: SN74AC574DWR maintains the same 8-bit D-Type flip-flop function with tri-state outputs and positive edge triggering. It offers improved propagation delay (6.0 ns) and lower quiescent current (4 µA). The part is functionally compatible for applications where timing specifications are met.

Q: Why does CD74AC374M96 have slower propagation delay than the original part?

A: CD74AC374M96 operates at a lower clock frequency (110 MHz versus 155 MHz) and exhibits 15.1 ns propagation delay. This part is suitable only for applications with relaxed timing requirements. Extended temperature range (-55°C to 125°C) and lower minimum supply voltage (1.5V) are trade-offs for reduced speed performance.

Q: Are all recommended substitutes ROHS3 compliant?

A: All active-status parts listed (SN74AC374DWR, MC74AC374DWR2G, SN74AC574DWR, 74AHC374D,118, CD74AC374M96, MC74AC374DWG, SN74AC374NSR) are ROHS3 compliant. The obsolete CD74AC374M from Harris Corporation is not ROHS compliant.

Q: What packaging options are available for the recommended substitutes?

A: SN74AC374DWR is available in Cut Tape and Digi-Reel packaging. MC74AC374DWR2G is supplied in Tape & Reel. MC74AC374DWG is available in Tube packaging. SN74AC374NSR is supplied in Tape & Reel. Verify packaging requirements for your procurement and assembly process.

Q: Can 74AHC374D,118 replace 74AC374SCX in high-current applications?

A: No. The 74AHC374D,118 provides only 8 mA output drive capability compared to 24 mA for the original part. Applications requiring 24 mA output current must use parts with equivalent drive specifications (SN74AC374DWR, MC74AC374DWR2G, SN74AC574DWR, or MC74AC374DWG).