SN74HC74D Equivalent & Substitute Parts

Part Overview

The SN74HC74D is a dual D-type flip-flop logic integrated circuit manufactured by Texas Instruments, housed in a 14-SOIC surface mount package. This component provides two independent D-type flip-flops with Set (Preset) and Reset functions, complementary outputs, and positive edge triggering. The SN74HC74D is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Part Number	SN74HC74D
Manufacturer	Texas Instruments
Logic Type	Flip Flop 2 Element D-Type 1 Bit
Package	14-SOIC (0.154", 3.90mm Width)
Number of Elements	2
Number of Bits per Element	1
Output Type	Complementary
Trigger Type	Positive Edge
Clock Frequency	60 MHz
Max Propagation Delay @ 6V, 50pF	15 ns
Voltage Supply Range	2V ~ 6V
Current Output High/Low	5.2 mA / 5.2 mA
Quiescent Current (Iq)	4 µA
Input Capacitance	3 pF
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitute parts for the SN74HC74D are classified based on the following substitution criteria:

Direct Manufacturer Substitutes maintain identical electrical and mechanical specifications, differing only in packaging format or product status. These parts are pin-compatible and functionally equivalent with no design modifications required.

Parametric Equivalents share the same base functionality and package but may exhibit variations in propagation delay, quiescent current, or temperature range. These parts are suitable for applications where the specified parameter variations remain within system tolerance.

Manufacturer Recommended Alternatives are actively produced parts from different manufacturers that meet or exceed the original specifications. These parts offer improved availability and long-term supply assurance.

Key Parameters Determining Substitutability:

Package type: 14-SOIC (0.154", 3.90mm Width)
Logic function: D-Type flip-flop with 2 elements, 1 bit per element
Output configuration: Complementary outputs
Trigger mechanism: Positive edge
Voltage supply range: 2V ~ 6V minimum
Pin compatibility: 14-pin SOIC footprint

Parameter Comparison

Part Number	Manufacturer	Clock Frequency (MHz)	Max Propagation Delay @ 6V, 50pF (ns)	Quiescent Current (µA)	Operating Temperature (°C)	Product Status	Packaging
SN74HC74D	Texas Instruments	60	15	4	-40 ~ 85	Discontinued at DiGi Electronics	14-SOIC
SN74HC74DR	Texas Instruments	60	15	4	-40 ~ 85	Active	14-SOIC
SN74HC74DG4	Texas Instruments	60	30	4	-40 ~ 85	Discontinued at DiGi Electronics	14-SOIC
MC74HC74ADR2G	onsemi	35	17	2	-55 ~ 125	Active	14-SOIC
74HC74D,653	NXP Semiconductors	82	37	40	-40 ~ 125	Active	14-SOIC
74HC74D	Toshiba Semiconductor and Storage	67	26	2	-40 ~ 85	Active	14-SOIC
74HC74D-Q100,118	Nexperia USA Inc.	82	37	40	-40 ~ 125	Active	14-SOIC
74HC74D/AUJ	NXP USA Inc.	82	37	40	-40 ~ 125	Active	14-SOIC
74VHC74M	Fairchild Semiconductor	115	9.3	2	-40 ~ 85	Active	14-SOIC
MC74HC74ADG	onsemi	35	17	2	-55 ~ 125	Active	14-SOIC

Engineering Selection Recommendations

Primary Recommendation: SN74HC74DR

The SN74HC74DR from Texas Instruments is the direct active equivalent to the discontinued SN74HC74D. It maintains identical electrical specifications including 60 MHz clock frequency, 15 ns propagation delay, and 4 µA quiescent current. The only difference is packaging format (Cut Tape & Digi-Reel versus standard packaging). This part is currently in active production status with 3,353 units in stock, ensuring supply continuity.

Secondary Recommendation: 74HC74D (Toshiba)

The Toshiba 74HC74D provides active production status with 225,400 units in inventory. Electrical parameters remain within acceptable tolerance of the original specification: 67 MHz clock frequency, 26 ns propagation delay, and 2 µA quiescent current. This part is ROHS3 compliant and maintains the same operating temperature range as the original.

Extended Temperature Range Option: MC74HC74ADR2G or 74HC74D,653

For applications requiring extended operating temperature range (-55°C to 125°C or -40°C to 125°C), the MC74HC74ADR2G from onsemi or 74HC74D,653 from NXP Semiconductors are suitable alternatives. Both maintain the 14-SOIC package and complementary output configuration. The MC74HC74ADR2G exhibits lower quiescent current (2 µA) compared to the original specification.

High-Speed Alternative: 74VHC74M

The 74VHC74M from Fairchild Semiconductor offers superior performance with 115 MHz clock frequency and 9.3 ns propagation delay. This part is suitable for applications requiring faster switching characteristics while maintaining the same 14-SOIC package footprint and complementary output configuration.

Automotive Grade Option: 74HC74D-Q100,118

The 74HC74D-Q100,118 from Nexperia USA Inc. is qualified to AEC-Q100 automotive standards and is suitable for automotive and harsh environment applications. This part maintains active production status with extended temperature range support.

All recommended substitutes are ROHS3 compliant and maintain MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage practices.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SN74HC74D with SN74HC74DR without PCB modifications?

A: Yes. The SN74HC74DR is a direct functional equivalent with identical pin configuration, electrical specifications, and 14-SOIC package dimensions. No PCB layout changes are required.

Q: What is the difference between SN74HC74D and SN74HC74DG4?

A: Both parts are from Texas Instruments in 14-SOIC packages. The primary difference is propagation delay: SN74HC74D specifies 15 ns maximum delay at 6V with 50 pF load, while SN74HC74DG4 specifies 30 ns. Both are suitable for the same applications if timing margins accommodate the longer delay specification.

Q: Is the Toshiba 74HC74D compatible with the original Texas Instruments part?

A: Yes. The Toshiba 74HC74D maintains identical pin configuration, package footprint (14-SOIC), and functional behavior. Electrical parameters vary slightly: 67 MHz clock frequency versus 60 MHz, and 26 ns propagation delay versus 15 ns. These variations remain within standard logic circuit tolerances for most applications.

Q: Why does the NXP 74HC74D,653 show higher quiescent current (40 µA) compared to the original (4 µA)?

A: The 74HC74D,653 is a different variant within the 74HC74 family. While it maintains the same logic function and package, the higher quiescent current reflects different internal design characteristics. This part is suitable for applications where quiescent current is not a critical constraint.

Q: Can I use 74VHC74M as a drop-in replacement?

A: Yes. The 74VHC74M is pin-compatible and functionally equivalent in a 14-SOIC package. The VHC series offers improved performance with 115 MHz clock frequency and 9.3 ns propagation delay. This part is suitable for applications requiring faster switching characteristics and is fully compatible with the original circuit design.

Q: What is the difference between Cut Tape & Digi-Reel and Tube packaging?

A: Both are surface mount packaging formats for the same component. Cut Tape & Digi-Reel is supplied on continuous tape suitable for automated pick-and-place assembly. Tube packaging supplies components in plastic tubes for manual handling or lower-volume assembly. Electrical and functional specifications are identical; the difference is procurement and assembly convenience.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitute parts listed maintain ROHS3 compliance status, ensuring compatibility with environmental and regulatory requirements equivalent to the original SN74HC74D specification.

Q: Which substitute part offers the best long-term availability?

A: The Toshiba 74HC74D demonstrates the strongest inventory position with 225,400 units in stock and active production status. This part provides the highest assurance for long-term supply continuity and procurement reliability.

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