SN74HC373PW Equivalent & Substitute Parts

Part Overview

The SN74HC373PW is a D-Type Transparent Latch logic IC manufactured by Texas Instruments, featuring an 8:8 circuit configuration with tri-state output in a 20-TSSOP surface mount package. This part is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production requirements. The 74HC373 series provides transparent latch functionality suitable for data storage and bus interface applications across industrial and commercial temperature ranges.

Key Parameters

Parameter	Value
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Supply Voltage Range	2V ~ 6V
Propagation Delay	15ns
Output Current (High/Low)	7.8mA / 7.8mA
Operating Temperature	-40°C ~ 85°C
Package Type	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SN74HC373PW is determined by strict equivalence across the following critical parameters:

Logic Type: D-Type Transparent Latch
Circuit Configuration: 8:8
Output Type: Tri-State
Supply Voltage: 2V ~ 6V
Package: 20-TSSOP surface mount
Mounting Type: Surface Mount
Output Current Capability: 7.8mA minimum (both high and low)

Substitute parts are grouped into three categories based on their relationship to the original specification:

Direct Substitutes maintain identical electrical specifications and package footprint, differing only in packaging format (tape & reel, cut tape, or bulk) or manufacturer source.

Upgrade Substitutes offer improved performance characteristics (faster propagation delay, extended temperature range) while maintaining full backward compatibility and identical pinout.

Manufacturer Recommended Substitutes include automotive-grade variants with AEC-Q100 qualification for applications requiring enhanced reliability.

Parametric Equivalents share the same base product number (74HC573 vs 74HC373) with functionally equivalent latch configurations suitable for applications where the specific variant is interchangeable.

Parameter Comparison

Part Number	Manufacturer	Propagation Delay (ns)	Operating Temp (°C)	Product Status	Packaging	Inventory (Pcs)
SN74HC373PW	Texas Instruments	15	-40 ~ 85	Discontinued	Tube	1479
SN74HC373PWR	Texas Instruments	15	-40 ~ 85	Active	Cut Tape & Digi-Reel	2440
MC74HC373ADTR2G	onsemi	21	-55 ~ 125	Active	Tape & Reel	2360
MM74HC373MTC	Fairchild Semiconductor	19	-40 ~ 85	Active	Bulk	2900
MM74HC373MTCX	onsemi	19	-40 ~ 85	Active	Cut Tape & Digi-Reel	16644
74HC373PW,118	Nexperia USA Inc.	12	-40 ~ 125	Active	Cut Tape & Digi-Reel	8276
74HC373PW-Q100,118	Nexperia USA Inc.	12	-40 ~ 125	Active	Tape & Reel	3640
MC74HC373ADTG	onsemi	21	-55 ~ 125	Active	Tube	1341
MM74HC573MTC	Fairchild Semiconductor	15	-40 ~ 85	Active	Bulk	7229

Engineering Selection Recommendations

For Direct Replacement (Identical Performance): SN74HC373PWR is the primary direct substitute, maintaining Texas Instruments sourcing with active product status and identical electrical specifications. MM74HC373MTCX offers the highest inventory availability (16,644 pcs) with equivalent performance characteristics and active status.

For Performance Enhancement: 74HC373PW,118 and 74HC373PW-Q100,118 from Nexperia provide superior propagation delay (12ns vs 15ns) and extended operating temperature range (-40°C to 125°C vs -40°C to 85°C), enabling use in wider temperature environments without performance degradation.

For Automotive Applications: 74HC373PW-Q100,118 includes AEC-Q100 automotive qualification and is suitable for automotive-grade designs requiring enhanced reliability certification.

For Extended Temperature Range: MC74HC373ADTR2G and MC74HC373ADTG from onsemi support -55°C to 125°C operating range, accommodating extreme temperature environments beyond standard industrial specifications.

All substitute parts maintain ROHS3 compliance, identical supply voltage range (2V ~ 6V), and equivalent output current specifications (7.8mA), ensuring functional compatibility within the 20-TSSOP package footprint.

Frequently Asked Questions (FAQ)

Q: Can SN74HC373PWR be used as a direct replacement for SN74HC373PW? A: Yes. SN74HC373PWR is a direct electrical equivalent with identical propagation delay (15ns), operating temperature range (-40°C to 85°C), and output specifications. The only difference is packaging format (cut tape & Digi-Reel vs tube). Pinout and functionality are identical.

Q: What is the difference between MM74HC373MTC and MM74HC373MTCX? A: Both parts are functionally equivalent with 19ns propagation delay and -40°C to 85°C operating range. MM74HC373MTCX is available in cut tape & Digi-Reel packaging with significantly higher inventory (16,644 pcs vs 2,900 pcs), while MM74HC373MTC is supplied in bulk packaging.

Q: Why do some substitutes have different propagation delays? A: Propagation delay variation (12ns to 21ns) reflects different manufacturer process technologies and design implementations. All values remain within acceptable logic timing margins for standard 74HC373 applications. Selection should be based on specific timing requirements of the target circuit.

Q: Is the Nexperia 74HC373PW,118 an upgrade or direct substitute? A: It functions as an upgrade substitute. It maintains full backward compatibility and identical pinout while offering improved propagation delay (12ns vs 15ns) and extended temperature range (-40°C to 125°C vs -40°C to 85°C). It can replace the original part in any application.

Q: What does the AEC-Q100 qualification on 74HC373PW-Q100,118 mean? A: AEC-Q100 is an automotive electronics qualification standard. This part is certified for automotive applications requiring enhanced reliability testing and quality assurance. It is suitable for automotive designs but can also be used in non-automotive applications.

Q: Can MM74HC573MTC be used instead of SN74HC373PW? A: MM74HC573MTC is a parametric equivalent with the same 74HC series latch functionality and identical electrical specifications (15ns propagation delay, -40°C to 85°C). The base product number differs (573 vs 373), but both provide equivalent D-Type transparent latch operation in the same package. Verify application-specific requirements before substitution.

Q: What packaging options are available for substitute parts? A: Substitute parts are available in multiple packaging formats: Tube (MC74HC373ADTG), Cut Tape & Digi-Reel (SN74HC373PWR, MM74HC373MTCX, 74HC373PW,118), Tape & Reel (MC74HC373ADTR2G, 74HC373PW-Q100,118), and Bulk (MM74HC373MTC). Select based on procurement volume and assembly line requirements.

Q: Are all substitutes RoHS3 compliant? A: All listed substitute parts maintain ROHS3 compliance, ensuring compatibility with environmental and regulatory requirements equivalent to the original SN74HC373PW specification.

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