74HC374N,652 Equivalent & Substitute Parts

Part Overview

The 74HC374N,652 is a D-Type flip-flop logic integrated circuit manufactured by NXP USA Inc., designed for 8-bit positive edge-triggered applications. This part features tri-state, non-inverted outputs and operates across a 2V to 6V supply voltage range. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, maintenance, and production continuity. Substitute parts must maintain functional equivalence while meeting the same electrical and mechanical specifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	74HC374N,652
Manufacturer	NXP USA Inc.
Category	Logic
Description	IC FF D-TYPE SNGL 8BIT 20DIP
Type	D-Type Flip Flop
Number of Elements	1
Number of Bits per Element	8
Output Type	Tri-State, Non-Inverted
Trigger Type	Positive Edge
Voltage - Supply	2V ~ 6V
Clock Frequency	83 MHz
Max Propagation Delay @ V, Max CL	28ns @ 6V, 50pF
Current - Output High, Low	7.8mA, 7.8mA
Current - Quiescent (Iq)	4 µA
Input Capacitance	4.6 pF
Operating Temperature	-40°C ~ 125°C
Mounting Type	Through Hole
Package / Case	20-DIP (0.300", 7.62mm)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the 74HC374N,652 is determined by the following critical parameters:

Functional Type: D-Type flip-flop with 1 element, 8 bits per element, positive edge trigger
Output Configuration: Tri-state, non-inverted outputs
Electrical Specifications: Supply voltage 2V ~ 6V, output current 7.8mA (high and low), propagation delay performance
Package Compatibility: 20-DIP through-hole mounting (0.300", 7.62mm) for direct pin-compatible replacement
Mounting Type: Through-hole for PCB integration

Substitute parts are grouped into two categories:

Pin-Compatible Through-Hole Replacements (20-DIP package): CD74HC374E, SN74HC374AN, SN74HC374N
Functional Equivalent with Different Package (20-SOIC surface mount): 74HC374D,653

All substitute parts maintain the same base product number (74HC374) and core functional specifications, ensuring electrical compatibility within the defined parameter ranges.

Parameter Comparison

Parameter	74HC374N,652 (NXP)	CD74HC374E (Harris)	74HC374D,653 (Nexperia)	SN74HC374AN (TI)	SN74HC374N (TI)
Type	D-Type	D-Type	D-Type	D-Type	D-Type
Number of Elements	1	1	1	1	1
Number of Bits per Element	8	8	8	8	8
Output Type	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Clock Frequency	83 MHz	60 MHz	83 MHz	70 MHz	70 MHz
Max Propagation Delay @ V, Max CL	28ns @ 6V, 50pF	28ns @ 6V, 50pF	28ns @ 6V, 50pF	31ns @ 6V, 50pF	39ns @ 6V, 150pF
Current - Output High, Low	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA
Current - Quiescent (Iq)	4 µA	8 µA	4 µA	8 µA	8 µA
Input Capacitance	4.6 pF	10 pF	4.6 pF	3 pF	3 pF
Operating Temperature	-40°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Surface Mount	Through Hole	Through Hole
Package / Case	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)	20-SOIC (0.295", 7.50mm)	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)
Product Status	Obsolete	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Pin-Compatible Through-Hole Replacement (20-DIP Package):

SN74HC374AN (Texas Instruments) or SN74HC374N (Texas Instruments): Both are active products with ROHS3 compliance. SN74HC374AN offers the narrower operating temperature range (-40°C to +85°C) and lower input capacitance (3 pF). SN74HC374N supports the same temperature range with slightly higher propagation delay at 150pF load. Both are suitable for new designs and legacy system maintenance.
CD74HC374E (Harris Corporation): Obsolete status and RoHS non-compliance limit applicability to legacy systems where RoHS exemption is documented. Extended operating temperature range (-55°C to +125°C) may be beneficial for extreme environment applications.

For Surface Mount Replacement (20-SOIC Package):

74HC374D,653 (Nexperia USA Inc.): Active product with ROHS3 compliance and electrical specifications matching the original part (83 MHz clock frequency, 4 µA quiescent current, 4.6 pF input capacitance). Recommended for new PCB designs requiring surface mount technology. Requires PCB layout modification and reflow soldering process.

Compliance Considerations:

All active substitute parts (SN74HC374AN, SN74HC374N, 74HC374D,653) meet ROHS3 compliance requirements. CD74HC374E is RoHS non-compliant and should only be selected when legacy system constraints or specific design requirements mandate its use.

Frequently Asked Questions (FAQ)

Q: Can I use SN74HC374AN or SN74HC374N as a direct replacement for 74HC374N,652 on existing PCBs?

A: Yes. Both Texas Instruments parts are pin-compatible through-hole 20-DIP packages with identical pinout. No PCB modification is required. Electrical specifications remain within acceptable operating parameters for the 74HC374 family.

Q: What is the difference between SN74HC374AN and SN74HC374N?

A: Both are functionally equivalent D-Type flip-flops with identical pinout and core specifications. SN74HC374AN specifies propagation delay at 50pF load (31ns), while SN74HC374N specifies propagation delay at 150pF load (39ns). Selection depends on your circuit's load capacitance requirements.

Q: Can I use 74HC374D,653 as a replacement for the original 74HC374N,652?

A: 74HC374D,653 is functionally equivalent but uses a different package (20-SOIC surface mount versus 20-DIP through-hole). Direct PCB substitution is not possible without redesign. This part is suitable for new designs or PCB rework projects where surface mount technology is preferred.

Q: Why is CD74HC374E listed as a substitute if it is obsolete and RoHS non-compliant?

A: CD74HC374E is included because it maintains full functional and electrical equivalence to the original part. It is suitable for legacy system maintenance where RoHS compliance is not required or where design documentation permits non-compliant components. For new designs, active alternatives are recommended.

Q: What are the key parameters I should verify when selecting a substitute?

A: Verify the following parameters match your application requirements: D-Type flip-flop function, 8-bit configuration, positive edge trigger, tri-state non-inverted outputs, 2V to 6V supply voltage, 20-pin package type (DIP or SOIC), propagation delay performance at your circuit's load capacitance, and operating temperature range. All listed substitutes meet these core requirements.

Q: Is the operating temperature range difference between parts significant?

A: The original 74HC374N,652 operates from -40°C to +125°C. SN74HC374AN and SN74HC374N operate from -40°C to +85°C, which is narrower. If your application requires operation above +85°C, verify that the substitute part's temperature range is acceptable. CD74HC374E extends to -55°C to +125°C for extreme low-temperature applications.

Q: What is the significance of quiescent current differences (4 µA versus 8 µA)?

A: Quiescent current represents power consumption when the device is not switching. The original part and 74HC374D,653 specify 4 µA, while Texas Instruments and Harris parts specify 8 µA. For battery-powered or low-power applications, the lower quiescent current may be preferable. For standard applications, this difference is negligible.

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