FST3253MTC Equivalent & Substitute Parts

Part Overview

The FST3253MTC is a 2 x 4:1 Multiplexer/Demultiplexer logic IC manufactured by onsemi in a 16-TSSOP surface mount package. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. The FST3253MTC operates with single supply voltage between 4V and 5.5V across an operating temperature range of -40°C to 85°C, serving applications requiring signal routing and multiplexing functionality in compact form factors.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution for the FST3253MTC is determined by strict equivalence across the following parameters:

Circuit configuration: 2 x 4:1 multiplexer/demultiplexer topology
Package type: 16-TSSOP surface mount with identical 0.173" width (4.40mm)
Voltage supply: Single supply operation within compatible voltage ranges
Operating temperature: -40°C to 85°C minimum requirement
Mounting compatibility: Surface mount technology

All substitute parts listed maintain identical functional specifications and physical packaging, ensuring direct replacement capability without circuit redesign. Voltage supply ranges vary slightly between manufacturers but remain within acceptable operating margins for standard logic applications.

Parameter Comparison

Part Number	Manufacturer	Circuit	Voltage Supply	Operating Temp	Package	Product Status	RoHS Status	Packaging Type
FST3253MTC	onsemi	2 x 4:1	4V ~ 5.5V	-40°C ~ 85°C	16-TSSOP	Obsolete	Not specified	Not specified
SN74CBT3253PW	Texas Instruments	2 x 4:1	4.5V ~ 5.5V	-40°C ~ 85°C	16-TSSOP	Last Time Buy	ROHS3 Compliant	Tube
CBT3253APW,118	Nexperia USA Inc.	2 x 4:1	4.5V ~ 5.5V	-40°C ~ 85°C	16-TSSOP	Active	ROHS3 Compliant	Tape & Reel (TR)
PI5C3253LE	Diodes Incorporated	2 x 4:1	4.75V ~ 5.25V	-40°C ~ 85°C	16-TSSOP	Last Time Buy	ROHS3 Compliant	Tube
PI5C3253LEX	Diodes Incorporated	2 x 4:1	4.75V ~ 5.25V	-40°C ~ 85°C	16-TSSOP	Last Time Buy	ROHS3 Compliant	Tape & Reel (TR)
SN74CBT3253CPW	Texas Instruments	2 x 4:1	4.5V ~ 5.5V	-40°C ~ 85°C	16-TSSOP	Active	ROHS3 Compliant	Tube
SN74CBT3253CPWR	Texas Instruments	2 x 4:1	4.5V ~ 5.5V	-40°C ~ 85°C	16-TSSOP	Active	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

For applications requiring the FST3253MTC, the following selection criteria apply based on product status and compliance:

Active Status Parts (Recommended for New Designs):

CBT3253APW,118 (Nexperia USA Inc.) - Active product status with ROHS3 compliance and Tape & Reel packaging for high-volume production
SN74CBT3253CPW (Texas Instruments) - Active product status with ROHS3 compliance and Tube packaging
SN74CBT3253CPWR (Texas Instruments) - Active product status with ROHS3 compliance and Cut Tape & Digi-Reel packaging for automated assembly

Last Time Buy Parts (Suitable for Legacy Support):

SN74CBT3253PW (Texas Instruments) - Last Time Buy status with ROHS3 compliance
PI5C3253LE (Diodes Incorporated) - Last Time Buy status with ROHS3 compliance and Tube packaging
PI5C3253LEX (Diodes Incorporated) - Last Time Buy status with ROHS3 compliance and Tape & Reel packaging

All substitute parts maintain ROHS3 compliance and identical electrical specifications within their respective voltage supply ranges. Selection between Texas Instruments, Nexperia, and Diodes Incorporated variants depends on supply chain availability, packaging requirements, and existing design qualifications.

Frequently Asked Questions (FAQ)

Q: Can the FST3253MTC be directly replaced with any of these substitute parts? A: Yes. All listed substitute parts maintain identical 2 x 4:1 multiplexer/demultiplexer circuit configuration, 16-TSSOP package geometry, and operating temperature range of -40°C to 85°C. Direct pin-for-pin replacement is supported without circuit modification.

Q: What is the voltage supply difference between substitute parts? A: The FST3253MTC and Texas Instruments parts (SN74CBT3253 series) operate at 4V ~ 5.5V and 4.5V ~ 5.5V respectively. Diodes Incorporated parts (PI5C3253 series) operate at 4.75V ~ 5.25V. All ranges overlap sufficiently for standard 5V logic applications. Verify your specific supply voltage against the selected part's datasheet for edge-case applications.

Q: What packaging options are available? A: Substitute parts are available in three packaging formats: Tube (standard for manual assembly), Tape & Reel (TR) for automated pick-and-place assembly, and Cut Tape (CT) & Digi-Reel for semi-automated processes. Select based on your production assembly method.

Q: Are all substitute parts ROHS3 compliant? A: All listed substitute parts carry ROHS3 compliance certification. The original FST3253MTC does not specify RoHS status due to its obsolete classification.

Q: Which substitute part should I choose for new production designs? A: Select from the Active status parts: CBT3253APW,118, SN74CBT3253CPW, or SN74CBT3253CPWR. These ensure long-term availability and ongoing manufacturer support. Choose packaging based on your assembly process requirements.

Q: Can I mix substitute parts from different manufacturers in the same production run? A: Yes. All substitute parts are functionally equivalent within their specified parameters. However, maintain consistent sourcing within a single production batch to ensure consistent supply chain logistics and documentation.

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