74LCX112M Equivalent & Substitute Parts

Part Overview

The 74LCX112M is a dual JK-type flip-flop logic integrated circuit manufactured by onsemi, housed in a 16-SOIC surface mount package. This device provides two independent 1-bit JK flip-flops with complementary outputs, negative edge triggering, and set/reset functionality. The 74LCX112M is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Texas Instruments offers active alternatives in the 74LVC series that maintain functional and electrical compatibility while providing extended product lifecycle support.

Key Parameters

Parameter	Value
Manufacturer Part Number	74LCX112M
Manufacturer	onsemi
Category	Logic
Type	JK Type Flip-Flop
Number of Elements	2
Number of Bits per Element	1
Output Type	Complementary
Trigger Type	Negative Edge
Clock Frequency	150 MHz
Voltage Supply Range	2V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 74LCX112M is based on the following critical parameters that must remain constant across equivalent parts:

Functional Type: Dual JK-type flip-flop with 1-bit per element configuration
Output Configuration: Complementary outputs with set/preset and reset functions
Trigger Mechanism: Negative edge triggering
Clock Frequency: 150 MHz maximum operating frequency
Package: 16-SOIC (0.154", 3.90mm Width) surface mount
Pin Compatibility: Identical pinout and signal definitions
Operating Temperature Range: -40°C ~ 85°C
Compliance: ROHS3 compliant, REACH unaffected

The Texas Instruments SN74LVC112 series (SN74LVC112AD, SN74LVC112ADR, SN74LVC112ADT) meets all substitution criteria. These parts are functionally equivalent, maintain identical package geometry, and provide active product status with extended lifecycle support. Differences in supply voltage range (1.65V ~ 3.6V vs. 2V ~ 3.6V) and propagation delay characteristics represent improvements over the obsolete 74LCX112M.

Parameter Comparison

Parameter	74LCX112M (onsemi)	SN74LVC112AD (TI)	SN74LVC112ADR (TI)	SN74LVC112ADT (TI)
Type	JK Type	JK Type	JK Type	JK Type
Number of Elements	2	2	2	2
Number of Bits per Element	1	1	1	1
Output Type	Complementary	Complementary	Complementary	Complementary
Trigger Type	Negative Edge	Negative Edge	Negative Edge	Negative Edge
Clock Frequency	150 MHz	150 MHz	150 MHz	150 MHz
Max Propagation Delay @ 3.3V, 50pF	7.5ns	5.9ns	5.9ns	5.9ns
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Voltage - Supply	2V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V
Current - Quiescent (Iq)	10 µA	10 µA	10 µA	10 µA
Input Capacitance	7 pF	4.5 pF	4.5 pF	4.5 pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The SN74LVC112 series from Texas Instruments provides direct functional substitution for the obsolete 74LCX112M. All three variants (SN74LVC112AD, SN74LVC112ADR, SN74LVC112ADT) maintain active product status and full ROHS3 compliance, ensuring long-term availability and regulatory alignment.

Selection between the three Texas Instruments alternatives depends on packaging and supply chain requirements:

SN74LVC112AD: Supplied in tube packaging, suitable for lower-volume applications and manual assembly processes.
SN74LVC112ADR: Supplied in tape and reel format, optimized for automated pick-and-place assembly with 2220 pieces in stock.
SN74LVC112ADT: Supplied in tape and reel format, alternative inventory source with 1443 pieces in stock.

The SN74LVC112 series demonstrates improved electrical performance compared to the 74LCX112M, including faster propagation delay (5.9ns vs. 7.5ns at 3.3V, 50pF) and lower input capacitance (4.5pF vs. 7pF). The extended supply voltage range (1.65V ~ 3.6V) provides additional design flexibility for low-power applications.

Frequently Asked Questions (FAQ)

Q: Can the SN74LVC112 series directly replace the 74LCX112M without circuit modifications?

A: Yes. The SN74LVC112 series maintains identical pinout, package geometry, and functional behavior. No circuit modifications are required for direct substitution in 16-SOIC surface mount applications.

Q: What is the difference between SN74LVC112AD, SN74LVC112ADR, and SN74LVC112ADT?

A: These three part numbers are functionally and electrically identical. The differences are in packaging format: SN74LVC112AD is supplied in tubes, while SN74LVC112ADR and SN74LVC112ADT are supplied in tape and reel format for automated assembly. Selection depends on production volume and assembly equipment compatibility.

Q: Are there any electrical performance differences between the 74LCX112M and SN74LVC112 series?

A: The SN74LVC112 series exhibits faster propagation delay (5.9ns vs. 7.5ns) and lower input capacitance (4.5pF vs. 7pF). Supply voltage range is extended to 1.65V minimum. These represent improvements that enhance system performance and enable operation in lower-voltage applications.

Q: Is the 74LCX112M still available for new designs?

A: No. The 74LCX112M is classified as obsolete. The SN74LVC112 series from Texas Instruments is the recommended alternative for new designs and ongoing production.

Q: Do all substitute parts meet the same compliance requirements?

A: Yes. All SN74LVC112 variants are ROHS3 compliant and REACH unaffected, matching the compliance profile of the 74LCX112M.

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