74FST3253DTR2 Equivalent & Substitute Parts

Part Overview

The 74FST3253DTR2 is a Multiplexer/Demultiplexer logic IC with 2 x 4:1 circuit configuration in a 16-TSSOP surface mount package, manufactured by onsemi. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The 74FST series has been superseded by the 74CBT series, which maintains functional compatibility while offering improved product status and compliance certifications.

Key Parameters

Parameter	Value
Type	Multiplexer/Demultiplexer
Circuit Configuration	2 x 4:1
Independent Circuits	1
Voltage Supply	4V ~ 5.5V
Operating Temperature Range	-40°C ~ 85°C
Package Type	16-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74FST3253DTR2 is based on strict equivalence across the following parameters:

Circuit type and configuration (2 x 4:1 Multiplexer/Demultiplexer)
Package format (16-TSSOP with identical physical dimensions)
Voltage supply range compatibility (minimum 4.5V for substitutes; original supports 4V minimum)
Operating temperature range (-40°C ~ 85°C)
Single supply voltage source architecture
Moisture sensitivity level (MSL 1)
Surface mount technology

All substitute parts listed maintain identical functional specifications and pinout compatibility. The primary differences are manufacturer identity, product status, and compliance certifications.

Parameter Comparison

Parameter	74FST3253DTR2 (onsemi)	SN74CBT3253PW (TI)	CBT3253APW,118 (Nexperia)	SN74CBT3253CPW (TI)	SN74CBT3253CPWR (TI)
Type	Multiplexer/Demultiplexer	Multiplexer/Demultiplexer	Multiplexer/Demultiplexer	Multiplexer/Demultiplexer	Multiplexer/Demultiplexer
Circuit Configuration	2 x 4:1	2 x 4:1	2 x 4:1	2 x 4:1	2 x 4:1
Voltage Supply Range	4V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 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 / Case	16-TSSOP (0.173", 4.40mm)	16-TSSOP (0.173", 4.40mm)	16-TSSOP (0.173", 4.40mm)	16-TSSOP (0.173", 4.40mm)	16-TSSOP (0.173", 4.40mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Last Time Buy	Active	Active	Active

Engineering Selection Recommendations

For new designs and ongoing procurement, the following selection criteria apply:

Active Product Status Priority: CBT3253APW,118 (Nexperia) and SN74CBT3253CPW / SN74CBT3253CPWR (Texas Instruments) are recommended as primary substitutes due to active product status, ensuring long-term availability and manufacturing support.

RoHS3 Compliance: All substitute parts meet ROHS3 compliance requirements, whereas the original 74FST3253DTR2 is non-compliant. This is a critical consideration for applications subject to environmental regulations.

Voltage Supply Consideration: Substitute parts specify a minimum supply voltage of 4.5V, compared to the original part's 4V minimum. Designs operating at 4V to 4.5V require verification of functional performance with substitute parts.

Packaging and Inventory: SN74CBT3253CPWR offers Cut Tape & Digi-Reel packaging with 5100 units in stock. CBT3253APW,118 provides Tape & Reel packaging with 8498 units in stock. SN74CBT3253PW is available in Tube packaging with 2000 units in stock.

Frequently Asked Questions (FAQ)

Q: Can the 74FST3253DTR2 be directly replaced with SN74CBT3253PW? A: Yes. Both parts share identical circuit configuration (2 x 4:1), package format (16-TSSOP), operating temperature range (-40°C ~ 85°C), and MSL rating (1). The primary difference is the minimum supply voltage specification: SN74CBT3253PW requires 4.5V minimum, while the original supports 4V minimum. Designs operating above 4.5V are fully compatible.

Q: What is the difference between the Texas Instruments and Nexperia substitute options? A: Both manufacturers provide functionally equivalent 74CBT3253 variants with identical electrical specifications and package dimensions. The primary differences are product status (Nexperia CBT3253APW,118 is active; Texas Instruments SN74CBT3253PW is last time buy), packaging format (Nexperia offers Tape & Reel; Texas Instruments offers Tube or Cut Tape variants), and inventory availability.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts (SN74CBT3253PW, CBT3253APW,118, SN74CBT3253CPW, SN74CBT3253CPWR) are ROHS3 compliant. The original 74FST3253DTR2 is non-compliant.

Q: Does the 16-TSSOP package remain identical across all parts? A: Yes. All parts, including the original and all substitutes, use the 16-TSSOP package with identical physical dimensions (0.173" width, 4.40mm). PCB footprints and land patterns are interchangeable.

Q: Which substitute part should be selected for new production designs? A: CBT3253APW,118 (Nexperia) is recommended for new designs due to active product status and high inventory availability (8498 units). For Texas Instruments preference, SN74CBT3253CPW or SN74CBT3253CPWR are both active products with substantial inventory.

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