74FST3245DWR2 Equivalent & Substitute Parts

Part Overview

The 74FST3245DWR2 is an 8-channel 1:1 bus switch logic IC manufactured by onsemi in a 20-SOIC surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The 74FST series bus switch provides independent circuit switching functionality with single supply voltage operation across the 4V to 5.5V range, suitable for applications requiring multiplexed signal routing in digital systems.

Key Parameters

Parameter	Specification
Part Number	74FST3245DWR2
Manufacturer	onsemi
Type	Bus Switch
Circuit Configuration	8 x 1:1
Independent Circuits	1
Voltage Supply Range	4V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74FST3245DWR2 is determined by strict equivalence across the following critical parameters:

Circuit configuration: 8 x 1:1 bus switch topology
Package type: 20-SOIC form factor with identical 0.295" (7.50mm) width
Voltage supply range: 4V ~ 5.5V single supply operation
Operating temperature range: -40°C ~ 85°C
Independent circuits: 1
Mounting type: Surface Mount

All substitute parts listed maintain identical electrical and mechanical specifications within these parameters. Substitution is valid across different packaging formats (Tube vs. Tape & Reel) and different product status classifications, provided the core electrical and physical parameters remain unchanged.

Parameter Comparison

Parameter	74FST3245DWR2 (onsemi)	SN74CBT3245ADW (TI)	SN74CBT3245CDW (TI)	SN74CBT3245ADWR (TI)	SN74CBT3245CDWR (TI)
Manufacturer	onsemi	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Series	74FST	74CBT	74CBT	74CBT	74CBT
Type	Bus Switch	Bus Switch	Bus Switch	Bus Switch	Bus Switch
Circuit Configuration	8 x 1:1	8 x 1:1	8 x 1:1	8 x 1:1	8 x 1:1
Independent Circuits	1	1	1	1	1
Voltage Supply Range	4V ~ 5.5V	4V ~ 5.5V	4V ~ 5.5V	4V ~ 5.5V	4V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Packaging Format	Not specified	Tube	Tube	Tape & Reel (TR)	Tape & Reel (TR)
Product Status	Obsolete	Last Time Buy	Active	Last Time Buy	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99	EAR99	EAR99	EAR99

Engineering Selection Recommendations

For new designs and production applications, the Texas Instruments SN74CBT3245 series substitutes are preferred over the obsolete onsemi 74FST3245DWR2 due to active product status and ROHS3 compliance certification.

SN74CBT3245CDW and SN74CBT3245CDWR are recommended as primary selections due to Active product status, ensuring long-term availability and supply chain stability. Both variants maintain identical electrical specifications and differ only in packaging format: SN74CBT3245CDW is supplied in Tube packaging, while SN74CBT3245CDWR is supplied in Tape & Reel format for automated assembly processes.

SN74CBT3245ADW and SN74CBT3245ADWR are secondary options classified as Last Time Buy, indicating limited future availability. These parts remain electrically equivalent but should be selected only when specific packaging or inventory requirements necessitate their use.

All Texas Instruments substitutes provide ROHS3 compliance, addressing regulatory requirements not met by the original onsemi component. Moisture sensitivity level remains unchanged at MSL 1 (Unlimited) across all variants, eliminating moisture-related handling constraints.

Frequently Asked Questions (FAQ)

Q: Can SN74CBT3245 series parts directly replace the 74FST3245DWR2 in existing designs?

A: Yes. The SN74CBT3245 series maintains identical electrical specifications across voltage supply range (4V ~ 5.5V), operating temperature (-40°C ~ 85°C), circuit configuration (8 x 1:1), and 20-SOIC package dimensions. Direct substitution is valid without circuit modification.

Q: What is the difference between Tube and Tape & Reel packaging formats?

A: Tube packaging (SN74CBT3245ADW, SN74CBT3245CDW) is suitable for manual assembly and lower-volume applications. Tape & Reel packaging (SN74CBT3245ADWR, SN74CBT3245CDWR) is optimized for automated pick-and-place assembly processes in high-volume production. Electrical performance is identical between formats.

Q: Why should I select Active status parts over Last Time Buy parts?

A: Active status parts (SN74CBT3245CDW, SN74CBT3245CDWR) guarantee ongoing manufacturing and supply availability. Last Time Buy parts (SN74CBT3245ADW, SN74CBT3245ADWR) have limited production windows and will eventually become unavailable. For long-term production requirements, Active status parts ensure supply chain continuity.

Q: Does RoHS3 compliance affect electrical performance?

A: No. RoHS3 compliance is a manufacturing and material specification that does not alter electrical characteristics. The ROHS3 Compliant Texas Instruments substitutes deliver identical functional performance to the RoHS non-compliant original part while meeting modern regulatory requirements.

Q: Are there any pin-to-pin compatibility concerns?

A: No. All substitute parts use the identical 20-SOIC package with matching pin assignments. Pin-to-pin compatibility is guaranteed across all listed substitutes.

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