SN74HC74DBRG4 Equivalent & Substitute Parts

Part Overview

The SN74HC74DBRG4 is a dual D-type flip-flop logic integrated circuit manufactured by Texas Instruments, housed in a 14-SSOP package. 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 discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain functional and electrical compatibility for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74HC74DBRG4
Manufacturer	Texas Instruments
Base Product Number	74HC74
Type	D-Type Flip-Flop, 2 Element, 1 Bit per Element
Package / Case	14-SSOP (0.209", 5.30mm Width)
Clock Frequency	60 MHz
Max Propagation Delay @ 6V, 50pF	30 ns
Voltage Supply Range	2V to 6V
Output Current (High/Low)	5.2 mA / 5.2 mA
Quiescent Current (Iq)	4 µA
Operating Temperature	-40°C to 85°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution of the SN74HC74DBRG4 is determined by the following critical parameters:

Functional Equivalence: All substitute parts must be dual D-type flip-flops with 2 elements, 1 bit per element, complementary outputs, set/preset and reset functions, and positive edge triggering.

Electrical Compatibility: Supply voltage range (2V to 6V minimum), output current capability (5.2 mA minimum), and operating temperature range (-40°C to 85°C minimum) must be maintained or exceeded.

Package Compatibility: The original 14-SSOP package (0.209", 5.30mm width) can be substituted with 14-TSSOP packages (0.173", 4.40mm width) as both are surface-mount 14-pin configurations with identical pinouts for the 74HC74 base product number.

Compliance Requirements: RoHS3 compliance and MSL Level 1 rating are maintained across all substitute options.

Substitute parts are grouped into two categories: parametric equivalents (identical electrical specifications) and manufacturer-recommended alternatives (enhanced performance or extended temperature range).

Parameter Comparison

Parameter	SN74HC74DBRG4 (Original)	SN74HC74DBR	74HC74PW,118	74HC74PW-Q100,118	74VHC74MTCX	MM74HC74AMTC	MM74HC74AMTCX	NLV74HC74ADTR2G
Manufacturer	Texas Instruments	Texas Instruments	NXP USA Inc.	Nexperia USA Inc.	Fairchild Semiconductor	onsemi	onsemi	onsemi
Base Product	74HC74	74HC74	74HC74	74HC74	74VHC74	74HC74	74HC74	74HC74
Package	14-SSOP (5.30mm)	14-SSOP (5.30mm)	14-TSSOP (4.40mm)	14-TSSOP (4.40mm)	14-TSSOP (4.40mm)	14-TSSOP (4.40mm)	14-TSSOP (4.40mm)	14-TSSOP (4.40mm)
Clock Frequency	60 MHz	60 MHz	82 MHz	82 MHz	115 MHz	94 MHz	94 MHz	35 MHz
Max Propagation Delay @ 6V, 50pF	30 ns	30 ns	37 ns	37 ns	9.3 ns	19 ns	19 ns	17 ns
Voltage Supply Range	2V to 6V	2V to 6V	2V to 6V	2V to 6V	2V to 5.5V	2V to 6V	2V to 6V	2V to 6V
Output Current (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	8 mA / 8 mA	5.2 mA / 5.2 mA	5.2 mA / 5.2 mA	5.2 mA / 5.2 mA
Quiescent Current (Iq)	4 µA	4 µA	40 µA	40 µA	2 µA	4 µA	4 µA	2 µA
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 125°C	-40°C to 125°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-55°C to 125°C
Product Status	Discontinued	Active	Active	Active	Active	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute (Parametric Equivalent): SN74HC74DBR from Texas Instruments maintains identical electrical specifications and operating parameters to the original SN74HC74DBRG4. This part is currently active and available in higher inventory quantities (5207 units). The only difference is packaging format (Cut Tape & Digi-Reel vs. original specification), making it the direct functional replacement.

Recommended Alternatives for Active Production:

74HC74PW-Q100,118 (Nexperia USA Inc.) is qualified to AEC-Q100 automotive standards with extended operating temperature range (-40°C to 125°C) and active product status. This part is available in highest inventory (13212 units) and suitable for applications requiring automotive-grade reliability.

MM74HC74AMTC and MM74HC74AMTCX (onsemi) provide active product status with improved propagation delay (19 ns vs. 30 ns original) while maintaining full electrical compatibility. Both are RoHS3 compliant with MSL Level 1 rating.

74VHC74MTCX (Fairchild Semiconductor) offers superior performance with 115 MHz clock frequency and 9.3 ns propagation delay, along with reduced quiescent current (2 µA). This part is suitable for high-speed applications where performance margin is required. Note: maximum supply voltage is 5.5V, requiring verification against 6V operation if applicable.

Avoid: NLV74HC74ADTR2G is marked as obsolete and should not be selected for new designs despite extended temperature range capability.

Frequently Asked Questions (FAQ)

Q: Can I use a 14-TSSOP package substitute in place of the original 14-SSOP package?

A: Yes. Both 14-SSOP and 14-TSSOP are surface-mount 14-pin packages with identical pinouts for the 74HC74 base product number. The primary difference is package width (5.30mm vs. 4.40mm). PCB layout and footprint must be verified for compatibility, but electrical functionality is identical.

Q: What is the difference between 74HC74 and 74VHC74 series?

A: The 74VHC74 series (represented by 74VHC74MTCX) operates at higher clock frequencies (115 MHz vs. 60 MHz) with faster propagation delay (9.3 ns vs. 30 ns). However, maximum supply voltage is limited to 5.5V compared to 6V for 74HC74. Verify your application's supply voltage before selecting 74VHC74 variants.

Q: Are all substitute parts RoHS3 compliant?

A: Most substitute parts are explicitly RoHS3 compliant (SN74HC74DBR, 74HC74PW-Q100,118, MM74HC74AMTC, MM74HC74AMTCX, NLV74HC74ADTR2G). Compliance status for 74HC74PW,118 and 74VHC74MTCX is not specified in available documentation and should be confirmed with manufacturers if RoHS3 compliance is a requirement.

Q: Which substitute offers the best inventory availability?

A: 74HC74PW-Q100,118 from Nexperia USA Inc. has the highest inventory (13212 units), followed by 74VHC74MTCX from Fairchild Semiconductor (20505 units). Both are suitable for immediate procurement.

Q: Can I use NLV74HC74ADTR2G as a substitute?

A: NLV74HC74ADTR2G is marked as obsolete and should not be selected for new production designs. While it offers extended operating temperature range (-55°C to 125°C), its obsolete status makes long-term availability uncertain.

Q: What is the impact of different quiescent current specifications?

A: Quiescent current (Iq) ranges from 2 µA to 40 µA across substitute options. For battery-powered or low-power applications, select parts with lower Iq (74VHC74MTCX at 2 µA or NLV74HC74ADTR2G at 2 µA). For standard applications, the difference is negligible. 74HC74PW,118 and 74HC74PW-Q100,118 have elevated Iq (40 µA) and should be avoided in power-sensitive designs.

Q: Is automotive qualification required for my application?

A: If AEC-Q100 automotive qualification is required, select 74HC74PW-Q100,118 from Nexperia USA Inc., which explicitly carries this certification. Other substitutes do not list automotive qualification.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message