74HC74DR2G Equivalent & Substitute Parts

Part Overview

The 74HC74DR2G is a dual D-type flip-flop logic integrated circuit manufactured by onsemi in 14-SOIC surface mount packaging. This component functions as a 2-element D-type flip-flop with complementary outputs, set/preset and reset capabilities, and positive edge triggering. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	74HC74DR2G
Manufacturer	onsemi
Series	74HC
Type	D-Type Flip-Flop
Number of Elements	2
Number of Bits per Element	1
Output Type	Complementary
Trigger Type	Positive Edge
Function	Set(Preset) and Reset
Clock Frequency	28 MHz
Max Propagation Delay @ 6V, 50pF	17 ns
Voltage - Supply	2V ~ 6V
Current - Output High, Low	5.2 mA, 5.2 mA
Current - Quiescent (Iq)	2 µA
Input Capacitance	10 pF
Operating Temperature	-55°C ~ 125°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the 74HC74DR2G is determined by the following critical parameters:

Functional Equivalence Requirements:

Series: 74HC (standard TTL-compatible CMOS logic family)
Type: D-Type Flip-Flop
Number of Elements: 2
Number of Bits per Element: 1
Output Type: Complementary
Trigger Type: Positive Edge
Function: Set(Preset) and Reset

Electrical Compatibility Requirements:

Voltage Supply Range: 2V ~ 6V (must encompass or match)
Current Output Capability: 5.2 mA minimum (High and Low)
Propagation Delay: Must not exceed application timing requirements

Physical Compatibility Requirements:

Package / Case: 14-SOIC (0.154", 3.90mm Width) for direct PCB substitution, or 14-TSSOP (0.173", 4.40mm Width) for compatible footprint variants
Mounting Type: Surface Mount

Substitute parts are grouped into two categories: Direct Package Equivalents (14-SOIC) and Compatible Package Variants (14-TSSOP). All listed substitutes maintain functional and electrical compatibility within the specified parameters.

Parameter Comparison

Parameter	74HC74DR2G	MC74HC74ADR2G	MM74HC74AM	MM74HC74AMX	74HC74D,653	74HC74D-Q100,118	74HC74PW-Q100,118	CD74HC74M96	CD74HC74MT	SN74HC74DG4
Manufacturer	onsemi	onsemi	Fairchild Semiconductor	Fairchild Semiconductor	NXP Semiconductors	Nexperia USA Inc.	Nexperia USA Inc.	Texas Instruments	Texas Instruments	Texas Instruments
Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type
Number of Elements	2	2	2	2	2	2	2	2	2	2
Output Type	Complementary	Complementary	Complementary	Complementary	Complementary	Complementary	Complementary	Complementary	Complementary	Complementary
Clock Frequency	28 MHz	35 MHz	94 MHz	94 MHz	82 MHz	82 MHz	82 MHz	50 MHz	50 MHz	60 MHz
Max Propagation Delay @ 6V, 50pF	17 ns	17 ns	19 ns	19 ns	37 ns	37 ns	37 ns	30 ns	30 ns	30 ns
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Current - Output High, Low	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA
Current - Quiescent (Iq)	2 µA	2 µA	4 µA	4 µA	40 µA	40 µA	40 µA	4 µA	4 µA	4 µA
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-TSSOP	14-SOIC	14-SOIC	14-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Obsolete	Discontinued at DiGi Electronics

Engineering Selection Recommendations

Primary Recommendation - Direct Replacement (14-SOIC Package):

MC74HC74ADR2G (onsemi) is the preferred direct substitute. It maintains identical package geometry (14-SOIC), matching propagation delay (17 ns @ 6V, 50pF), and equivalent quiescent current (2 µA). The part is currently active in production with RoHS3 compliance and unlimited moisture sensitivity rating. This substitution requires no PCB layout modifications.

Secondary Recommendations - Active Production Alternatives (14-SOIC Package):

CD74HC74M96 (Texas Instruments) and CD74HC74MT (Texas Instruments) provide functional equivalence in 14-SOIC packaging with active or recently active status. Both maintain the -55°C to 125°C operating temperature range and 2 µA quiescent current. Propagation delay is 30 ns, acceptable for applications not requiring the 17 ns specification of the original part.

Compatible Package Variant (14-TSSOP Package):

74HC74PW-Q100,118 (Nexperia USA Inc.) offers automotive-grade qualification (AEC-Q100) in 14-TSSOP packaging. This part is suitable for applications requiring extended temperature range (-40°C to 125°C) and automotive compliance. PCB footprint modification is required due to different package dimensions (0.173" vs 0.154" width).

Substitutes with Extended Timing Considerations:

MM74HC74AM and MM74HC74AMX (Fairchild Semiconductor) provide higher clock frequency (94 MHz) but operate within -40°C to 85°C temperature range, limiting suitability for designs requiring the full -55°C to 125°C range of the original part.

74HC74D,653 (NXP Semiconductors) and 74HC74D-Q100,118 (Nexperia USA Inc.) exhibit higher quiescent current (40 µA) and extended propagation delay (37 ns), making them suitable only for applications with relaxed timing and power consumption requirements.

Frequently Asked Questions (FAQ)

Q: Can MC74HC74ADR2G directly replace 74HC74DR2G without PCB modifications?

A: Yes. MC74HC74ADR2G is packaged in identical 14-SOIC (0.154", 3.90mm Width) surface mount configuration. Pin-to-pin compatibility and electrical specifications are equivalent. No PCB layout changes are required.

Q: What is the primary difference between the 14-SOIC and 14-TSSOP package variants?

A: Package width differs: 14-SOIC measures 0.154" (3.90mm) while 14-TSSOP measures 0.173" (4.40mm). Footprint spacing and land patterns are not interchangeable. PCB redesign is necessary to accommodate 14-TSSOP variants such as 74HC74PW-Q100,118.

Q: Why do some substitutes show higher quiescent current (40 µA vs 2 µA)?

A: Quiescent current variation reflects manufacturing process differences across semiconductor vendors. Parts with 40 µA quiescent current (NXP and Nexperia variants) are suitable for applications where standby power consumption is not critical. For battery-powered or low-power designs, select substitutes with 2-4 µA quiescent current.

Q: Are all listed substitutes RoHS3 compliant?

A: Most active production substitutes carry RoHS3 compliance. CD74HC74M and CD74HC74MT (Texas Instruments) are explicitly RoHS3 compliant. Verify compliance documentation for specific procurement requirements, particularly for regulated industries.

Q: What is the significance of AEC-Q100 qualification on 74HC74D-Q100,118 and 74HC74PW-Q100,118?

A: AEC-Q100 qualification indicates automotive-grade testing and reliability standards. These parts are suitable for automotive applications requiring extended temperature cycling and environmental stress testing. Non-automotive applications do not require this qualification.

Q: Can I use MM74HC74AM or MM74HC74AMX if my design operates only within -40°C to 85°C?

A: Yes, provided your application does not require the full -55°C to 125°C operating range. Both Fairchild parts offer higher clock frequency (94 MHz) and lower input capacitance (5 pF), which may provide performance benefits in timing-critical designs within the narrower temperature range.

Q: What is the impact of propagation delay differences on circuit performance?

A: The original 74HC74DR2G specifies 17 ns maximum propagation delay. Substitutes with 30 ns or 37 ns delays introduce additional signal latency. Verify that your circuit timing budget accommodates these delays. For applications with tight timing constraints, select MC74HC74ADR2G (17 ns) or MM74HC74AM/AMX (19 ns).

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