74F373SJX D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74F373SJX is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring an 8:8 circuit configuration with tri-state output capability. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates within the 74F logic family standard, maintaining functional compatibility across qualified substitutes while accommodating different packaging and availability options.

Key Parameters

Parameter	Value
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Supply Voltage Range	4.5V ~ 5.5V
Independent Circuits	1
Propagation Delay Time	5.3ns
Output Current (High/Low)	3mA / 24mA
Operating Temperature Range	0°C ~ 70°C
Mounting Type	Surface Mount
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 74F373SJX is determined by strict adherence to the following electrical and mechanical parameters:

Mandatory Matching Parameters:

Logic Type: D-Type Transparent Latch
Circuit Configuration: 8:8
Output Type: Tri-State
Supply Voltage Range: 4.5V ~ 5.5V
Independent Circuits: 1
Operating Temperature Range: 0°C ~ 70°C
Mounting Type: Surface Mount
Moisture Sensitivity Level: 1 (Unlimited)

Allowable Variations:

Propagation Delay Time: Substitute parts may have equal or greater delay times (5.3ns baseline)
Package / Case dimensions: Variations within the 20-SOIC/20-SO family are permitted
Manufacturer: Different qualified manufacturers within the 74F series
Product Status: Active or Last Time Buy status acceptable for obsolete parts
Packaging format: Tube, Tape & Reel, or standard packaging options

All substitute parts listed maintain functional equivalence within these parameters.

Parameter Comparison

Parameter	74F373SJX (onsemi)	SN74F373NSR (TI)	SN74F373DW (TI)	SN74F373DWR (TI)
Manufacturer	onsemi	Texas Instruments	Texas Instruments	Texas Instruments
Logic Type	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch
Circuit Configuration	8:8	8:8	8:8	8:8
Output Type	Tri-State	Tri-State	Tri-State	Tri-State
Supply Voltage	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Independent Circuits	1	1	1	1
Propagation Delay Time	5.3ns	8.6ns	8.6ns	8.6ns
Output Current (High/Low)	3mA / 24mA	3mA / 24mA	3mA / 24mA	3mA / 24mA
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	20-SOIC (0.209", 5.30mm Width)	20-SOIC (0.209", 5.30mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)
Product Status	Obsolete	Active	Last Time Buy	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

SN74F373NSR (Texas Instruments) is the primary direct substitute for the 74F373SJX. This part maintains identical package dimensions (20-SOIC 0.209" width), carries Active product status, and holds ROHS3 compliance certification. The propagation delay increase from 5.3ns to 8.6ns remains within acceptable timing margins for most 74F logic applications.

SN74F373DWR (Texas Instruments) provides an alternative with Active product status and ROHS3 compliance. This part features a wider package body (0.295" width) and is supplied in Tape & Reel format, suitable for high-volume automated assembly operations.

SN74F373DW (Texas Instruments) offers Last Time Buy availability with ROHS3 compliance and Tube packaging. The wider package body (0.295" width) requires PCB layout verification before selection.

All three substitutes maintain REACH Unaffected and EAR99 export classification status consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can SN74F373NSR directly replace 74F373SJX without PCB modifications?

A: Yes. The SN74F373NSR maintains identical package dimensions (20-SOIC 0.209" width), pin configuration, and electrical specifications. No PCB layout changes are required.

Q: What is the impact of the increased propagation delay (8.6ns vs 5.3ns) in Texas Instruments substitutes?

A: The 3.3ns delay increase is within the 74F logic family tolerance and does not affect functional compatibility in standard applications. System timing analysis should confirm acceptability for critical path operations.

Q: Are SN74F373DW and SN74F373DWR interchangeable?

A: Both parts share identical electrical specifications and the same wider package body (20-SOIC 0.295" width). The primary difference is packaging format: SN74F373DW uses Tube packaging while SN74F373DWR uses Tape & Reel. PCB footprint compatibility is identical.

Q: Why does SN74F373NSR have a narrower package body than SN74F373DW and SN74F373DWR?

A: Package body width variations exist within the 20-SOIC family standard. The 0.209" width (SN74F373NSR) and 0.295" width (SN74F373DW/DWR) represent different manufacturing specifications. PCB footprint verification is required before substitution.

Q: What compliance certifications apply to all substitute parts?

A: All Texas Instruments substitutes carry ROHS3 compliance, REACH Unaffected status, and EAR99 export classification. Moisture Sensitivity Level remains 1 (Unlimited) across all parts.

Q: Is the onsemi 74F373SJX still available for new designs?

A: The 74F373SJX is classified as Obsolete. Texas Instruments substitutes with Active status (SN74F373NSR, SN74F373DWR) are recommended for new designs and long-term availability assurance.

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