74LCX16374MEAX Equivalent & Substitute Parts

Part Overview

The 74LCX16374MEAX is a dual 8-bit D-type flip-flop logic integrated circuit manufactured by onsemi, housed in a 48-BSSOP package. This device functions as a standard positive-edge-triggered flip-flop with tri-state, non-inverted outputs, operating across a 2V to 3.6V supply range. The part is currently obsolete, making equivalent and substitute components necessary for ongoing design support, legacy system maintenance, and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	74LCX16374MEAX
Manufacturer	onsemi
Series	74LCX
Function	D-Type Flip-Flop, Dual 8-Bit
Output Type	Tri-State, Non-Inverted
Number of Elements	2
Number of Bits per Element	8
Clock Frequency	170 MHz
Max Propagation Delay @ 3.3V, 50pF	6.2 ns
Trigger Type	Positive Edge
Current - Output High/Low	24 mA / 24 mA
Voltage - Supply	2V ~ 3.6V
Current - Quiescent (Iq)	20 µA
Input Capacitance	7 pF
Operating Temperature	-40°C ~ 85°C
Package / Case	48-BSSOP (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74LCX16374MEAX is determined by the following critical parameters:

Functional Equivalence: All substitute parts must be dual 8-bit D-type flip-flops with positive-edge triggering and tri-state, non-inverted outputs.

Electrical Compatibility: Supply voltage range, output drive capability (24 mA minimum), quiescent current, and propagation delay characteristics must support the application requirements.

Package Compatibility: The 48-BSSOP package footprint is the primary mechanical constraint. Substitutes in alternative packages (48-TSSOP, 48-TFSOP, 48-TVSOP) require PCB redesign and are listed separately.

Logic Family Compatibility: The 74LCX, 74LVCH, and 74LVC families operate within overlapping voltage ranges (1.65V to 3.6V) and share functional pin configurations, enabling direct substitution where package compatibility exists.

Product Status Consideration: Active and discontinued parts are listed; obsolete parts require evaluation for long-term availability.

Parameter Comparison

Part Number	Manufacturer	Series	Package	Clock Freq (MHz)	Prop Delay @ 3.3V, 50pF (ns)	Supply Voltage (V)	Iq (µA)	Output Current (mA)	Temp Range (°C)	Status
74LCX16374MEAX	onsemi	74LCX	48-BSSOP	170	6.2	2.0 ~ 3.6	20	24 / 24	-40 ~ 85	Obsolete
74LVCH16374ADGGG4	Texas Instruments	74LVCH	48-TSSOP	150	4.5	1.65 ~ 3.6	20	24 / 24	-40 ~ 125	Discontinued
74LVCH16374APVG	IDT	74LVCH	48-BSSOP	150	4.5	2.7 ~ 3.6	10	24 / 24	-40 ~ 85	Active
CY74FCT16374CTPVC	Texas Instruments	74FCT	48-BSSOP	—	—	4.5 ~ 5.5	500	32 / 64	-40 ~ 85	Obsolete
SN74LVC16374ADGGR	Texas Instruments	74LVC	48-TSSOP	150	4.5	1.65 ~ 3.6	20	24 / 24	-40 ~ 85	Active
SN74LVC16374ADGVR	Texas Instruments	74LVC	48-TVSOP	150	4.5	1.65 ~ 3.6	20	24 / 24	-40 ~ 85	Active
SN74LVC16374ADL	Texas Instruments	74LVC	48-BSSOP	150	4.5	1.65 ~ 3.6	20	24 / 24	-40 ~ 85	Active
SN74LVC16374ADLR	Texas Instruments	74LVC	48-BSSOP	150	4.5	1.65 ~ 3.6	20	24 / 24	-40 ~ 85	Active
SN74LVC16374DGGR	Texas Instruments	74LVC	48-TSSOP	100	7.5	2.7 ~ 3.6	40	24 / 24	-40 ~ 85	Active
SN74LVC16374DL	Texas Instruments	74LVC	48-BSSOP	150	4.5	1.65 ~ 3.6	20	24 / 24	-40 ~ 85	Active
SN74LVC16374DLR	Texas Instruments	74LVC	48-BSSOP	100	7.5	2.7 ~ 3.6	40	24 / 24	-40 ~ 85	Active

Engineering Selection Recommendations

Direct Package Substitutes (48-BSSOP):

The SN74LVC16374ADL and SN74LVC16374ADLR from Texas Instruments are the primary direct substitutes for the 74LCX16374MEAX. Both maintain the 48-BSSOP footprint, support the required 2V to 3.6V supply range (with extended lower limit to 1.65V), and deliver equivalent 24 mA output drive. Both parts are active products with RoHS3 compliance and REACH unaffected status. The ADLR variant includes tape and reel packaging for automated assembly.

The 74LVCH16374APVG from IDT provides an alternative in the same 48-BSSOP package with active product status. This part operates within 2.7V to 3.6V, slightly narrower than the original specification, and features reduced quiescent current (10 µA versus 20 µA).

Alternative Package Substitutes (48-TSSOP / 48-TFSOP):

For designs permitting PCB layout changes, the SN74LVC16374ADGGR and SN74LVC16374DGGR offer smaller 48-TSSOP packages with active status. The ADGGR variant maintains 150 MHz clock frequency and 4.5 ns propagation delay, while the DGGR variant operates at 100 MHz with 7.5 ns delay and reduced quiescent current (40 µA).

The SN74LVC16374ADGVR provides the smallest footprint option in 48-TVSOP (0.173" width) with active status and equivalent electrical performance to the ADGGR.

Voltage Domain Considerations:

The 74LCX16374MEAX operates from 2V minimum supply. Substitutes in the 74LVC family extend the lower limit to 1.65V, providing enhanced compatibility with lower-voltage systems. The 74LVCH16374APVG and CY74FCT16374CTPVC operate at higher minimum voltages (2.7V and 4.5V respectively) and require application-level voltage verification.

Legacy Compatibility:

The CY74FCT16374CTPVC operates at 5V logic levels and is obsolete. This part is listed for reference only in legacy system documentation and is not recommended for new designs.

Frequently Asked Questions (FAQ)

Q: Can the SN74LVC16374ADL directly replace the 74LCX16374MEAX without PCB modification?

A: Yes. Both parts use the 48-BSSOP package with identical pinout. The SN74LVC16374ADL operates within the 2V to 3.6V range required by the original design and delivers equivalent 24 mA output drive. Electrical performance is superior (4.5 ns versus 6.2 ns propagation delay).

Q: What is the difference between SN74LVC16374ADL and SN74LVC16374ADLR?

A: Both parts are electrically identical. The ADLR variant includes tape and reel packaging suitable for automated pick-and-place assembly, while the ADL is supplied in tube packaging for manual handling.

Q: Why do some substitutes have different operating temperature ranges?

A: The 74LVCH16374ADGGG4 extends the upper temperature limit to 125°C due to Texas Instruments' design specifications for that logic family variant. The 74LCX16374MEAX and most 74LVC variants are rated to 85°C. Application requirements determine which temperature range is necessary.

Q: Can I use the 74LVCH16374APVG if my circuit operates at 2.5V?

A: No. The 74LVCH16374APVG minimum supply voltage is 2.7V. At 2.5V operation, use the SN74LVC16374ADL, SN74LVC16374ADLR, or SN74LVC16374ADGGR, which support 1.65V minimum.

Q: What is the impact of switching to a 48-TSSOP package?

A: The 48-TSSOP package is physically smaller (0.240" width versus 0.295" for 48-BSSOP) and requires PCB layout redesign. Electrical function and pin assignment remain identical. Verify PCB trace routing and thermal management before implementation.

Q: Is the CY74FCT16374CTPVC suitable for new designs?

A: No. This part is obsolete and operates at 5V logic levels, incompatible with the 2V to 3.6V specification of the 74LCX16374MEAX. It is listed for reference in legacy system documentation only.

Q: Which substitute offers the lowest power consumption?

A: The 74LVCH16374APVG features the lowest quiescent current at 10 µA (versus 20 µA for most alternatives). However, it operates at 2.7V minimum supply voltage. For 2V operation with low power, the SN74LVC16374ADL at 20 µA quiescent current is the appropriate choice.

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