SN74AHCT74PW Equivalent & Substitute Parts

Part Overview

The SN74AHCT74PW is a dual D-type flip-flop logic integrated circuit manufactured by Texas Instruments in a 14-TSSOP surface mount package. This component functions as a 2-element D-type flip-flop with complementary outputs, positive edge triggering, and set/reset capability. The part is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production needs.

Substiute Parts

SN74AHCT74PW

Texas InstrumentsIn Stock: 2197SN74AHCT74PW Datasheet

Current PartRFQ

SN74AHCT74PWR

Texas InstrumentsIn Stock: 2004SN74AHCT74PWR Datasheet

DirectRFQ

74VHCT74AMTCX

Fairchild SemiconductorIn Stock: 430874VHCT74AMTCX Datasheet

DirectRFQ

74AHCT74PW,118

NXP SemiconductorsIn Stock: 1031274AHCT74PW,118 Datasheet

UpgradeRFQ

MC74VHC74DTG

onsemiIn Stock: 9264MC74VHC74DTG Datasheet

MFR RecommendedRFQ

MC74VHC74DTR2G

onsemiIn Stock: 5735MC74VHC74DTR2G Datasheet

MFR RecommendedRFQ

SN74AHCT74PWG4

Texas InstrumentsIn Stock: 886SN74AHCT74PWG4 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74AHCT74PW is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

• Type: D-Type flip-flop with 2 elements, 1 bit per element
• Output Type: Complementary outputs
• Trigger Type: Positive edge triggered
• Function: Set (Preset) and Reset capability
• Package: 14-TSSOP surface mount form factor
• Voltage Supply Range: Minimum 4.5V ~ 5.5V compatibility
• Operating Temperature: Minimum -40°C ~ 125°C range
• Clock Frequency: Minimum 140 MHz operation
• Propagation Delay: Maximum 11.4 ns @ 5V, 50pF load

Substitute parts are grouped into four categories based on their relationship to the main part:

1. Direct Manufacturer Substitutes - Same base function and electrical characteristics from the original manufacturer or compatible manufacturers
2. Upgrade Parts - Enhanced availability with identical or superior electrical performance
3. Manufacturer Recommended Substitutes - Factory-approved alternatives with comparable specifications
4. Parametric Equivalents - Parts meeting all critical electrical and mechanical requirements

Parameter Comparison

Engineering Selection Recommendations

SN74AHCT74PWR (Direct Manufacturer Substitute) This Texas Instruments part is the primary direct substitute, offering identical electrical specifications with improved propagation delay performance (8.8 ns vs. 11.4 ns). Active product status ensures long-term availability. Packaging format is Tape & Reel (TR) for production quantities. ROHS3 compliance and MSL 1 rating match the original part requirements.

74AHCT74PW,118 (Upgrade Part) NXP Semiconductors provides this upgrade variant with the same 74AHCT series base function and superior propagation delay (8.8 ns). Active status with 10,300 units in stock provides strong supply continuity. Full temperature range (-40°C ~ 125°C) and ROHS3 compliance maintain design compatibility.

MC74VHC74DTG and MC74VHC74DTR2G (Manufacturer Recommended Substitutes) onsemi's 74VHC series parts meet all critical functional requirements with extended operating temperature range (-55°C ~ 125°C). Clock frequency is reduced to 115 MHz with propagation delay of 9.3 ns, both within acceptable margins for most applications. Supply voltage range extends to 2V minimum, providing additional design flexibility. Both parts carry ROHS3 compliance and MSL 1 rating. DTG variant uses Tube packaging; DTR2G uses Tape & Reel packaging.

74VHCT74AMTCX (Direct Manufacturer Substitute) Fairchild Semiconductor's 74VHCT series provides functional equivalence with 8.8 ns propagation delay and 140 MHz clock frequency. Operating temperature range is limited to -40°C ~ 85°C, which may restrict use in extended temperature applications. Input capacitance is 4 pF versus 2 pF for the original part.

SN74AHCT74PWG4 (Parametric Equivalent) Texas Instruments' parametric equivalent maintains identical electrical specifications to the original SN74AHCT74PW with 8.8 ns propagation delay. Product status is discontinued at DiGi Electronics, limiting this option for new designs despite 849 units currently in stock.

Frequently Asked Questions (FAQ)

Q: Can I use MC74VHC74DTG or MC74VHC74DTR2G as direct replacements for SN74AHCT74PW?

A: Yes, these onsemi parts are functionally compatible. All critical parameters align: D-type flip-flop configuration, 2 elements with 1 bit each, complementary outputs, positive edge triggering, and 14-TSSOP package. The 115 MHz clock frequency and 9.3 ns propagation delay are within acceptable operating margins for applications designed around the original 140 MHz / 11.4 ns specifications. Extended temperature range (-55°C ~ 125°C) provides additional capability.

Q: What is the difference between SN74AHCT74PWR and 74AHCT74PW,118?

A: Both are active products with superior propagation delay (8.8 ns) compared to the original part. SN74AHCT74PWR is Texas Instruments' direct variant in Tape & Reel packaging with 1,900 units in stock. The 74AHCT74PW,118 is NXP Semiconductors' equivalent with 10,300 units available. Selection depends on supply chain preference and packaging requirements for your production process.

Q: Why does 74VHCT74AMTCX have a lower operating temperature maximum than other substitutes?

A: The 74VHCT74AMTCX from Fairchild Semiconductor is specified for -40°C ~ 85°C operation, compared to -40°C ~ 125°C for most other substitutes. This limitation should be evaluated against your application's thermal requirements. If extended high-temperature operation is required, select alternatives with -40°C ~ 125°C or -55°C ~ 125°C ratings.

Q: Are all substitute parts ROHS3 compliant?

A: ROHS3 compliance is confirmed for SN74AHCT74PWR, 74AHCT74PW,118, MC74VHC74DTG, MC74VHC74DTR2G, and SN74AHCT74PWG4. Fairchild Semiconductor's 74VHCT74AMTCX does not specify RoHS status in available documentation. Verify compliance requirements with your procurement process before selection.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All recommended substitutes carry this rating, ensuring compatibility with standard component storage and assembly processes.

Q: Can I mix different substitute parts in the same production run?

A: All substitute parts are functionally equivalent within the specified parameter ranges. However, mixing different manufacturers or series (74AHCT vs. 74VHC vs. 74VHCT) in the same assembly may introduce minor variations in propagation delay and input capacitance. For consistency, maintain single-source selection within a production batch unless design margins accommodate the documented parameter variations shown in the comparison table.