74AC74MTCX Equivalent & Substitute Parts

Part Overview

The 74AC74MTCX is a dual D-type flip-flop logic integrated circuit manufactured by onsemi in a 14-TSSOP surface mount package. This component features complementary outputs, positive edge triggering, and operates across a 2V to 6V supply voltage range with a maximum clock frequency of 160 MHz. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

74AC74MTCX

onsemiIn Stock: 199074AC74MTCX Datasheet

Current PartRFQ

MC74AC74DTR2G

onsemiIn Stock: 4443MC74AC74DTR2G Datasheet

DirectRFQ

SN74AC74D

Texas InstrumentsIn Stock: 1999SN74AC74D Datasheet

DirectRFQ

SN74AC74PW

Texas InstrumentsIn Stock: 1291SN74AC74PW Datasheet

DirectRFQ

SN74AC74PWR

Texas InstrumentsIn Stock: 5471SN74AC74PWR Datasheet

DirectRFQ

74AHC74PW,118

Nexperia USA Inc.In Stock: 1168574AHC74PW,118 Datasheet

SimilarRFQ

SN74AC74DBR

Texas InstrumentsIn Stock: 3170SN74AC74DBR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74AC74MTCX is determined by the following critical parameters:

Primary Substitution Criteria:

• Base product number (74AC74 logic function)
• Package type (14-TSSOP surface mount)
• Functional characteristics (dual D-type flip-flop, complementary outputs, positive edge trigger)
• Electrical specifications (2V–6V supply, 160 MHz clock frequency capability)
• Operating temperature range (-40°C to 85°C minimum)

Direct Substitutes maintain identical package, pinout, and electrical performance within the 74AC series from active manufacturers.

Similar Substitutes provide equivalent logic function but may differ in package dimensions, series designation (74AHC), or electrical performance parameters while remaining functionally compatible for most applications.

Parameter Comparison

Engineering Selection Recommendations

Recommended Direct Substitutes (Active Status):

MC74AC74DTR2G and SN74AC74PWR are the preferred direct substitutes for the obsolete 74AC74MTCX. Both maintain the 14-TSSOP package, 74AC series designation, and full electrical compatibility. MC74AC74DTR2G is supplied in Tape & Reel packaging, while SN74AC74PWR is available in Cut Tape & Digi-Reel format. Both are ROHS3 compliant and currently in active production status with higher inventory availability than the original part.

Alternative Direct Substitute (Discontinued Status):

SN74AC74PW provides identical package and electrical specifications but is listed as discontinued at DiGi Electronics. This part remains available through inventory channels and maintains full compatibility with the 74AC74MTCX.

Package Variant Substitutes:

SN74AC74D uses a 14-SOIC package (0.154" × 3.90mm) instead of 14-TSSOP, requiring PCB layout modification. SN74AC74DBR uses a 14-SSOP package (0.209" × 5.30mm), also requiring layout changes. Both maintain 74AC series electrical performance and are currently active.

Series Alternative (Lower Performance):

74AHC74PW,118 from Nexperia operates at 115 MHz maximum clock frequency versus 160 MHz for 74AC variants, with reduced output current (8mA versus 24mA). This part supports extended operating temperature to 125°C and is suitable only where lower speed requirements are acceptable. Supply voltage is limited to 2V–5.5V versus 2V–6V for 74AC parts.

All substitute parts maintain MSL Level 1 (unlimited moisture sensitivity), REACH unaffected status, and EAR99 export classification consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can I use MC74AC74DTR2G as a direct replacement for 74AC74MTCX?

A: Yes. MC74AC74DTR2G is a direct substitute. Both use the 14-TSSOP package, operate at 160 MHz, support 2V–6V supply voltage, and provide identical dual D-type flip-flop functionality with complementary outputs. The primary difference is packaging format (Tape & Reel versus tube) and improved quiescent current (4 µA versus 20 µA).

Q: What is the difference between 74AC74 and 74AHC74 variants?

A: The 74AHC74 series operates at a lower maximum clock frequency (115 MHz versus 160 MHz), provides reduced output current (8mA versus 24mA), and limits supply voltage to 2V–5.5V. The 74AHC74 supports extended operating temperature to 125°C. Use 74AHC74 only when application speed requirements are below 115 MHz.

Q: Can I substitute SN74AC74D (14-SOIC package) for the 14-TSSOP 74AC74MTCX?

A: Electrically yes, but PCB layout modification is required. The 14-SOIC package has different pin spacing and dimensions (0.154" × 3.90mm) compared to 14-TSSOP (0.173" × 4.40mm). Footprint redesign is necessary; direct socket substitution is not possible.

Q: Why does the 74AC74MTCX show 20 µA quiescent current while substitutes show 2–4 µA?

A: The higher quiescent current specification for 74AC74MTCX reflects the original onsemi manufacturing process. Substitute parts from Texas Instruments and Nexperia incorporate improved process technology resulting in lower standby power consumption. This improvement is beneficial for battery-powered and low-power applications.

Q: Are all substitute parts ROHS3 compliant?

A: All active and discontinued substitute parts listed are ROHS3 compliant. The original 74AC74MTCX does not specify RoHS status. All parts maintain MSL Level 1 rating and REACH unaffected classification.

Q: Which substitute has the best availability?

A: SN74AC74PWR (Texas Instruments, active status) and 74AHC74PW,118 (Nexperia, active status) show the highest inventory levels at 5,389 and 11,674 units respectively. MC74AC74DTR2G (onsemi, active status) provides 4,350 units in stock.