74HC74DB,112 Equivalent & Substitute Parts

Part Overview

The 74HC74DB,112 is a dual D-type flip-flop logic integrated circuit manufactured by Nexperia USA Inc. in a 14-SSOP surface mount package. This device provides two independent D-type flip-flops with Set (Preset) and Reset functions, complementary outputs, 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	74HC74DB,112
Manufacturer	Nexperia USA Inc.
Base Product Number	74HC74
Series	74HC
Function	Set (Preset) and Reset
Type	D-Type Flip-Flop
Number of Elements	2
Number of Bits per Element	1
Output Type	Complementary
Trigger Type	Positive Edge
Clock Frequency	82 MHz
Max Propagation Delay @ 6V, 50pF	37 ns
Voltage Supply Range	2V to 6V
Current Output High/Low	5.2 mA / 5.2 mA
Quiescent Current (Iq)	40 µA
Input Capacitance	4.6 pF
Operating Temperature Range	-40°C to 125°C
Package Type	14-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74HC74DB,112 is determined by strict adherence to the following electrical and mechanical parameters:

Core Substitution Criteria:

Base product number must be 74HC74
Function must be Set (Preset) and Reset
Type must be D-Type flip-flop
Number of elements must be 2
Number of bits per element must be 1
Output type must be Complementary
Trigger type must be Positive Edge
Voltage supply range must be 2V to 6V
Current output specifications must be 5.2 mA / 5.2 mA
Mounting type must be Surface Mount
RoHS3 compliance required

Package Compatibility: Substitutes are grouped into two package categories:

14-SSOP (0.209", 5.30mm Width) - Direct mechanical equivalent to the main part
14-TSSOP (0.173", 4.40mm Width) - Smaller footprint variant with identical electrical specifications

Clock frequency, propagation delay, quiescent current, input capacitance, and operating temperature range may vary within acceptable limits for the 74HC logic family while maintaining functional equivalence.

Parameter Comparison

Part Number	Manufacturer	Package	Clock Freq (MHz)	Prop Delay @ 6V, 50pF (ns)	Iq (µA)	Temp Range (°C)	Status
74HC74DB,112	Nexperia USA Inc.	14-SSOP	82	37	40	-40 to 125	Obsolete
74HC74PW,118	NXP USA Inc.	14-TSSOP	82	37	40	-40 to 125	Active
MC74HC74ADTR2G	onsemi	14-TSSOP	35	17	2	-55 to 125	Active
MM74HC74AMTC	onsemi	14-TSSOP	94	19	4	-40 to 85	Active
MM74HC74AMTCX	onsemi	14-TSSOP	94	19	4	-40 to 85	Active
NLV74HC74ADTR2G	onsemi	14-TSSOP	35	17	2	-55 to 125	Obsolete
SN74HC74DBR	Texas Instruments	14-SSOP	60	30	4	-40 to 85	Active
SN74HC74MPWREP	Texas Instruments	14-TSSOP	60	30	4	-55 to 125	Active
SN74HC74PW	Texas Instruments	14-TSSOP	60	30	4	-40 to 85	Discontinued
SN74HC74PWR	Texas Instruments	14-TSSOP	60	30	4	-40 to 85	Active
SN74HC74PWT	Texas Instruments	14-TSSOP	60	30	4	-40 to 85	Discontinued

Engineering Selection Recommendations

For Direct Package Replacement (14-SSOP): SN74HC74DBR from Texas Instruments is the recommended substitute for the 14-SSOP package form factor. This part maintains active product status, ROHS3 compliance, and identical mechanical compatibility with the original 74HC74DB,112. The extended temperature range (-55°C to 125°C) of SN74HC74MPWREP provides additional thermal margin if required by application specifications.

For Package Migration (14-TSSOP): 74HC74PW,118 from NXP USA Inc. provides the closest electrical match to the original part with identical clock frequency (82 MHz) and propagation delay (37 ns) specifications. This part is currently in active production status. SN74HC74PWR from Texas Instruments offers high inventory availability (210,400 units) with active product status and ROHS3 compliance, though with slightly reduced clock frequency (60 MHz) and propagation delay (30 ns).

For Extended Temperature Applications: MC74HC74ADTR2G and NLV74HC74ADTR2G both support the extended temperature range of -55°C to 125°C, matching the original part's upper temperature limit. MC74HC74ADTR2G is currently active, while NLV74HC74ADTR2G is obsolete.

All recommended substitutes maintain ROHS3 compliance, MSL Level 1 rating, and identical electrical functionality as specified for the 74HC74 base product number.

Frequently Asked Questions (FAQ)

Q: Can I use a 14-TSSOP package part as a direct replacement for the 14-SSOP original? A: Electrically yes, mechanically no. The 14-TSSOP package (0.173", 4.40mm width) is physically smaller than the 14-SSOP package (0.209", 5.30mm width). PCB layout and footprint modifications are required. Pin assignments remain identical.

Q: What is the difference between the various manufacturers' versions? A: All versions meet the 74HC74 base product specification for function, output type, and trigger characteristics. Variations exist in clock frequency (35 MHz to 94 MHz), propagation delay (17 ns to 37 ns), quiescent current (2 µA to 40 µA), and operating temperature ranges. These differences reflect different manufacturing processes and design optimizations by each manufacturer.

Q: Is the 74HC74PW,118 a true equivalent to the 74HC74DB,112? A: Yes, electrically. The 74HC74PW,118 matches the original part's clock frequency (82 MHz), propagation delay (37 ns), and quiescent current (40 µA). The primary difference is the package type: 14-TSSOP versus 14-SSOP. Both are manufactured by NXP and maintain identical functional specifications.

Q: Why do some substitutes have lower quiescent current specifications? A: Different manufacturing processes and die designs result in varying quiescent current performance. Parts like MC74HC74ADTR2G (2 µA) and MM74HC74AMTC (4 µA) use optimized processes that reduce standby power consumption compared to the original 40 µA specification. This is a performance improvement, not a limitation.

Q: Are all listed substitutes RoHS3 compliant? A: All substitutes listed meet ROHS3 compliance requirements. Moisture Sensitivity Level is uniformly rated as MSL 1 (Unlimited) across all parts, indicating no moisture sensitivity restrictions during storage or handling.

Q: What should I consider when selecting between active and discontinued parts? A: Active parts (SN74HC74PWR, SN74HC74DBR, 74HC74PW,118) offer long-term availability and production continuity. Discontinued parts (SN74HC74PW, SN74HC74PWT) may have limited remaining inventory. For new designs, active parts are recommended. For legacy system support, discontinued parts may be acceptable if inventory is confirmed available.

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