PI74LPT16374AA Equivalent & Substitute Parts

Part Overview

The PI74LPT16374AA is a 16-bit octal register (shift register, D-Type 2 Element 8 Bit) manufactured by Diodes Incorporated in 48-TSSOP packaging. This logic component operates at 4.5V to 5.5V supply voltage with tri-state output configuration and is designed for universal register applications across industrial temperature ranges (-40°C to 85°C).

The PI74LPT16374AA is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and leverage active product lines with enhanced electrical performance characteristics and compliance certifications.

Key Parameters

Parameter	PI74LPT16374AA
Manufacturer	Diodes Incorporated
Series	74LPT
Logic Type	Register, D-Type
Number of Elements	2
Number of Bits per Element	8
Output Type	Tri-State
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	48-TFSOP (0.240", 6.10mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the PI74LPT16374AA is determined by the following critical parameters:

Functional Equivalence: All substitute parts maintain the same logic function (D-Type flip-flop, 2 elements, 8 bits per element) with tri-state, non-inverted output configuration and positive edge trigger type.

Package Compatibility: Primary substitutes use the 48-TFSOP (0.240", 6.10mm Width) package, ensuring mechanical and electrical pin compatibility. One substitute (74LVCH16374APVG) uses 48-BSSOP (0.295", 7.50mm Width) packaging and requires PCB layout verification.

Voltage Supply Range: The original part operates at 4.5V to 5.5V. Substitute parts operate at lower voltage ranges (1.65V to 3.6V or 2V to 3.6V), making them suitable for modern low-voltage logic applications while maintaining backward compatibility in 3.3V systems.

Operating Temperature: All substitutes maintain the -40°C to 85°C range or extend to -40°C to 125°C, ensuring thermal compatibility.

Electrical Performance: Substitutes provide improved propagation delay (4.5ns to 7ns at 3.3V, 50pF), higher clock frequencies (150MHz to 300MHz), and reduced quiescent current, representing generational advances in logic technology.

Compliance & Status: Active product substitutes carry RoHS3 compliance and REACH unaffected status, addressing modern regulatory requirements absent in the obsolete original part.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Voltage Supply	Operating Temp	Package	Clock Frequency	Propagation Delay @ 3.3V, 50pF	RoHS Status
PI74LPT16374AA	Diodes Incorporated	74LPT	Obsolete	4.5V ~ 5.5V	-40°C ~ 85°C	48-TFSOP	N/A	N/A	RoHS non-compliant
74LCX162374MTDX	Fairchild Semiconductor	74LCX	Active	2V ~ 3.6V	-40°C ~ 85°C	48-TFSOP	170 MHz	7ns	N/A
74LCX16374MTDX	Fairchild Semiconductor	74LCX	Active	2V ~ 3.6V	-40°C ~ 85°C	48-TFSOP	170 MHz	6.2ns	N/A
74LVC16374ADGG,118	Nexperia USA Inc.	74LVC	Active	1.65V ~ 3.6V	-40°C ~ 125°C	48-TFSOP	300 MHz	5.4ns	ROHS3 Compliant
74LVCH16374ADGG-QJ	Nexperia USA Inc.	74LVCH	Active	1.65V ~ 3.6V	-40°C ~ 125°C	48-TFSOP	300 MHz	5.4ns	ROHS3 Compliant
74LVCH16374ADGGG4	Texas Instruments	74LVCH	Discontinued at DiGi Electronics	1.65V ~ 3.6V	-40°C ~ 125°C	48-TFSOP	150 MHz	4.5ns	ROHS3 Compliant
74LVCH16374APVG	IDT, Integrated Device Technology Inc	74LVCH	Active	2.7V ~ 3.6V	-40°C ~ 85°C	48-BSSOP	150 MHz	4.5ns	N/A
74LVT16374ADGG,118	Nexperia USA Inc.	74LVT	Active	2.7V ~ 3.6V	-40°C ~ 85°C	48-TFSOP	150 MHz	5ns	ROHS3 Compliant
M74LCX16374DTR2G	onsemi	74LCX	Active	2V ~ 3.6V	-55°C ~ 125°C	48-TFSOP	170 MHz	6.2ns	ROHS3 Compliant
MC74LCX16374DTG	onsemi	74LCX	Obsolete	2V ~ 3.6V	-55°C ~ 125°C	48-TFSOP	170 MHz	6.2ns	ROHS3 Compliant
SN74LVC16374ADGGR	Texas Instruments	74LVC	Active	1.65V ~ 3.6V	-40°C ~ 85°C	48-TFSOP	150 MHz	4.5ns	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Active Status, RoHS3 Compliant):

74LVC16374ADGG,118 (Nexperia) and SN74LVC16374ADGGR (Texas Instruments) are recommended as primary substitutes. Both parts are active products with RoHS3 compliance, extended operating temperature range (-40°C to 125°C), and superior electrical performance (300 MHz clock frequency, 5.4ns to 4.5ns propagation delay). These parts are suitable for new designs and long-term supply chain stability.

74LVCH16374ADGG-QJ (Nexperia) offers automotive-grade qualification (AEC-Q100) with identical electrical specifications to 74LVC16374ADGG,118, making it appropriate for automotive and mission-critical applications.

Secondary Substitutes (Active Status, Standard Compliance):

74LCX16374MTDX and M74LCX16374DTR2G (onsemi) provide active product alternatives with 170 MHz clock frequency and 6.2ns propagation delay. M74LCX16374DTR2G extends operating temperature to -55°C to 125°C and carries RoHS3 compliance, offering broader environmental coverage.

74LVT16374ADGG,118 (Nexperia) is an active alternative with RoHS3 compliance and 150 MHz performance, suitable for applications where lower clock frequency is acceptable.

Compatibility Considerations:

All primary and secondary substitutes maintain the 48-TFSOP package footprint, ensuring direct PCB compatibility. The 74LVCH16374APVG variant uses 48-BSSOP packaging (0.295" width versus 0.240") and requires PCB layout verification before implementation.

Obsolete Alternatives:

74LVCH16374ADGGG4 (Texas Instruments) and MC74LCX16374DTG (onsemi) are discontinued or obsolete products and should not be selected for new designs despite active inventory availability.

Frequently Asked Questions (FAQ)

Q: Can I directly replace PI74LPT16374AA with any of these substitutes on my existing PCB?

A: Yes, for all substitutes except 74LVCH16374APVG. The primary and secondary substitutes use the 48-TFSOP package with identical pin configuration and spacing (0.240", 6.10mm width). The 74LVCH16374APVG uses 48-BSSOP packaging (0.295" width) and requires PCB layout verification and potential rework.

Q: What is the main difference between 74LVC and 74LVCH series substitutes?

A: Both series provide equivalent D-Type flip-flop functionality with tri-state outputs. The 74LVCH series (specifically 74LVCH16374ADGG-QJ) includes automotive-grade qualification (AEC-Q100), making it suitable for automotive applications. Electrical performance is comparable between series variants.

Q: Why does the original PI74LPT16374AA operate at 4.5V to 5.5V while substitutes operate at lower voltages?

A: The PI74LPT16374AA represents older 5V logic technology. Modern substitutes use advanced CMOS processes optimized for 3.3V and lower voltage operation, reducing power consumption while maintaining functional compatibility in 3.3V systems. Substitutes are backward compatible in 5V systems through their upper voltage range limits (3.6V).

Q: Are all substitute parts RoHS compliant?

A: No. 74LCX162374MTDX, 74LCX16374MTDX, 74LVCH16374APVG, and MC74LCX16374DTG do not specify RoHS status in provided data. 74LVC16374ADGG,118, 74LVCH16374ADGG-QJ, 74LVCH16374ADGGG4, M74LCX16374DTR2G, and SN74LVC16374ADGGR are RoHS3 compliant. For new designs, select RoHS3 compliant alternatives.

Q: Which substitute offers the best propagation delay performance?

A: 74LVCH16374ADGGG4 (Texas Instruments) and SN74LVC16374ADGGR (Texas Instruments) both provide 4.5ns propagation delay at 3.3V with 50pF load, representing the fastest options. 74LVC16374ADGG,118 (Nexperia) provides 5.4ns performance with higher clock frequency (300 MHz).

Q: Can I use 74LVCH16374ADGGG4 in new production designs?

A: No. 74LVCH16374ADGGG4 is discontinued at DiGi Electronics and should not be selected for new designs despite current inventory availability. Select active product alternatives such as 74LVC16374ADGG,118 or SN74LVC16374ADGGR.

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

A: These are supply formats, not functional differences. Tape & Reel (TR) and Cut Tape (CT) are automated assembly formats. Bulk and Tube are manual handling formats. Select based on manufacturing process requirements, not electrical performance.

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