74LCX74MTC Equivalent & Substitute Parts

Part Overview

The 74LCX74MTC is a dual D-type flip-flop logic integrated circuit manufactured by onsemi in 14-TSSOP surface mount packaging. This device features complementary outputs, positive edge triggering, and set/reset functionality. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Active alternatives from major manufacturers provide direct functional replacement with maintained or improved electrical performance.

Key Parameters

Parameter	Value
Device Type	Flip Flop 2 Element D-Type 1 Bit
Number of Elements	2
Number of Bits per Element	1
Output Type	Complementary
Trigger Type	Positive Edge
Function	Set(Preset) and Reset
Clock Frequency	150 MHz
Max Propagation Delay @ 3.3V, 50pF	7ns
Voltage Supply Range	2V ~ 3.6V
Current Output High/Low	24mA / 24mA
Quiescent Current (Iq)	10 µA
Input Capacitance	7 pF
Operating Temperature	-40°C ~ 85°C
Package Type	14-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74LCX74MTC is determined by the following critical parameters:

Device Architecture: Dual D-type flip-flop with 2 elements, 1 bit per element, complementary outputs, positive edge trigger, and set/reset function
Electrical Performance: Clock frequency of 150 MHz, propagation delay of 7ns @ 3.3V/50pF, output drive of 24mA, quiescent current of 10 µA
Voltage Compatibility: Supply range of 2V ~ 3.6V
Package Compatibility: 14-TSSOP surface mount package (0.173", 4.40mm width)
Compliance: ROHS3 compliant, MSL 1 rating

Substitute parts are grouped into two categories:

Parametric Equivalent: MC74LCX74DTG (onsemi) maintains identical electrical specifications and 14-TSSOP packaging, differing only in product status (active vs. obsolete) and packaging format (tube).

Direct and Similar Manufacturers: Texas Instruments (SN74LVC74 series), NXP Semiconductors (74LVC74APW,118), and Nexperia USA Inc. (74LVC74APW-Q100J) offer functional equivalents with improved or comparable performance characteristics. These parts share the same base architecture, package footprint, and core electrical parameters while offering enhanced supply voltage ranges, lower propagation delays, or extended temperature ratings.

Parameter Comparison

Parameter	74LCX74MTC (Main)	MC74LCX74DTG	SN74LVC74APW	74LVC74APW,118	74LVC74APW-Q100J	SN74LVC74ADBR	SN74LVC74AMPWREP	SN74LVC74APWR	SN74LVC74APWT	SN74LVC74AQPWREP	SN74LVC74AQPWRQ1
Manufacturer	onsemi	onsemi	Texas Instruments	NXP Semiconductors	Nexperia USA Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Series	74LCX	74LCX	74LVC	74LVC	74LVC	74LVC	74LVC	74LVC	74LVC	74LVC	74LVC
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
Clock Frequency	150 MHz	150 MHz	150 MHz	150 MHz	150 MHz	150 MHz	100 MHz	150 MHz	150 MHz	150 MHz	150 MHz
Max Propagation Delay @ 3.3V, 50pF	7ns	7ns	5.2ns	5.2ns	5.2ns	5.2ns	5.2ns	5.2ns	5.2ns	5.2ns	5.2ns
Voltage Supply Range	2V ~ 3.6V	2V ~ 3.6V	1.65V ~ 3.6V	1.2V ~ 3.6V	1.2V ~ 3.6V	1.65V ~ 3.6V	2V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	2V ~ 3.6V	2V ~ 3.6V
Current Output High/Low	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA
Quiescent Current (Iq)	10 µA	10 µA	10 µA	10 µA	10 µA	10 µA	10 µA	10 µA	10 µA	10 µA	10 µA
Input Capacitance	7 pF	7 pF	5 pF	4 pF	4 pF	5 pF	5 pF	5 pF	5 pF	5 pF	5 pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package Type	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-SSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP
Packaging Format	-	Tube	Tube	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	-	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	No	No	No	No	Yes (AEC-Q100)	No	No	No	No	No	Yes (AEC-Q100)

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications)

MC74LCX74DTG from onsemi provides parametric equivalence to the 74LCX74MTC with identical electrical performance and operating temperature range. This part maintains the same 74LCX series architecture and is suitable for applications requiring no performance changes. The part is active and ROHS3 compliant.

For Enhanced Performance with Extended Temperature Range

SN74LVC74APW, SN74LVC74APWR, SN74LVC74APWT, and SN74LVC74AQPWREP from Texas Instruments offer improved propagation delay (5.2ns vs. 7ns), extended operating temperature to 125°C, and lower input capacitance. These parts are suitable for designs requiring higher temperature operation or tighter timing margins. All are ROHS3 compliant and active.

For Expanded Supply Voltage Range

74LVC74APW,118 from NXP Semiconductors and 74LVC74APW-Q100J from Nexperia USA Inc. support supply voltages as low as 1.2V, compared to the 2V minimum of the 74LCX74MTC. These parts are suitable for low-voltage applications and are ROHS3 compliant and active.

For Automotive Applications

74LVC74APW-Q100J and SN74LVC74AQPWRQ1 carry AEC-Q100 automotive qualification, making them suitable for automotive-grade designs requiring extended temperature operation (-40°C to 125°C) and automotive compliance certifications.

Package Consideration

SN74LVC74ADBR uses 14-SSOP packaging (0.209", 5.30mm width) instead of 14-TSSOP (0.173", 4.40mm width). This part is not recommended for direct PCB replacement without layout modification due to different package dimensions.

Frequently Asked Questions (FAQ)

Q: Can I use SN74LVC74APW as a direct replacement for 74LCX74MTC?

A: Yes. Both devices share identical functional architecture (dual D-type flip-flop, 2 elements, 1 bit per element, complementary outputs, positive edge trigger, set/reset function), identical clock frequency (150 MHz), identical output drive (24mA), identical quiescent current (10 µA), and identical 14-TSSOP package footprint. SN74LVC74APW offers improved propagation delay (5.2ns vs. 7ns) and extended operating temperature (-40°C to 125°C vs. -40°C to 85°C). Both are ROHS3 compliant.

Q: What is the difference between 74LCX and 74LVC series?

A: Both series are dual D-type flip-flops with identical functional specifications and package compatibility. The 74LVC series from multiple manufacturers (Texas Instruments, NXP, Nexperia) offers improved electrical performance with lower propagation delays and extended supply voltage ranges. The 74LCX series is primarily available from onsemi. For the 74LCX74MTC, the 74LVC equivalents provide superior performance characteristics while maintaining full functional compatibility.

Q: Why does SN74LVC74ADBR have a different package designation?

A: SN74LVC74ADBR uses 14-SSOP packaging (0.209", 5.30mm width) compared to the standard 14-TSSOP (0.173", 4.40mm width) used by the 74LCX74MTC and other listed substitutes. While functionally equivalent, the different package dimensions require PCB layout modification and are not pin-compatible for direct socket replacement.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts except 74LVC74APW,118 are explicitly ROHS3 compliant. The 74LVC74APW,118 from NXP Semiconductors does not specify RoHS status in the provided data. Verify RoHS compliance with the manufacturer if this is a design requirement.

Q: Which substitute part has the lowest propagation delay?

A: All 74LVC series substitutes (SN74LVC74APW, SN74LVC74APWR, SN74LVC74APWT, SN74LVC74AQPWREP, SN74LVC74AQPWRQ1, 74LVC74APW,118, 74LVC74APW-Q100J, and SN74LVC74ADBR) share a propagation delay of 5.2ns @ 3.3V/50pF, compared to 7ns for the 74LCX74MTC. MC74LCX74DTG maintains the original 7ns specification.

Q: Can I use 74LVC74APW,118 in applications requiring lower supply voltages?

A: Yes. The 74LVC74APW,118 from NXP Semiconductors supports supply voltages from 1.2V to 3.6V, compared to 2V to 3.6V for the 74LCX74MTC. This part is suitable for low-voltage designs. However, verify RoHS compliance status with the manufacturer if required for your application.

Q: What is the difference between cut tape, tape & reel, tube, and bulk packaging?

A: These are distribution formats affecting order quantities and handling. Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR) are standard for automated assembly. Tube packaging is used for smaller quantities. Bulk packaging is for large volume orders. All formats contain identical components; selection depends on production volume and assembly equipment compatibility.

Q: Are automotive-qualified parts required for my design?

A: Automotive qualification (AEC-Q100) is required only for automotive applications. 74LVC74APW-Q100J and SN74LVC74AQPWRQ1 carry this certification. For non-automotive applications, standard industrial-grade parts are appropriate.

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