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FST3253MTCX Equivalent & Substitute Parts
Part Overview
The FST3253MTCX is a 2 x 4:1 Multiplexer/Demultiplexer logic integrated circuit manufactured by onsemi in a 16-TSSOP surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The FST3253MTCX operates with a single supply voltage range of 4V to 5.5V and supports operating temperatures from -40°C to 85°C. Substitution is required to ensure design continuity and component availability for new production runs or legacy system maintenance.
Substiute Parts
Key Parameters
| Parameter | FST3253MTCX |
|---|---|
| Manufacturer | onsemi |
| Type | Multiplexer/Demultiplexer |
| Circuit Configuration | 2 x 4:1 |
| Independent Circuits | 1 |
| Package / Case | 16-TSSOP (0.173", 4.40mm Width) |
| Voltage Supply Range | 4V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution for the FST3253MTCX is determined by the following critical parameters: circuit configuration (2 x 4:1), package type (16-TSSOP or compatible), voltage supply range compatibility, and operating temperature range. Substitute parts are grouped into two categories:
Direct Substitutes (Identical Circuit Configuration & Package): Parts with 2 x 4:1 multiplexer/demultiplexer configuration in 16-TSSOP package that meet or exceed the electrical specifications of the original part.
Similar Substitutes (Alternative Packages or Circuit Variants): Parts with equivalent functionality but different package types (16-SSOP, 16-QSOP) or alternative circuit configurations (4 x 2:1) that may require PCB layout modifications.
The key parameters determining substitutability are: circuit type (2 x 4:1), independent circuits (1), package footprint compatibility, voltage supply range, and operating temperature range.
Parameter Comparison
| Part Number | Manufacturer | Circuit Config | Package | Voltage Supply | Temp Range | Product Status | Packaging Type |
|---|---|---|---|---|---|---|---|
| FST3253MTCX | onsemi | 2 x 4:1 | 16-TSSOP | 4V ~ 5.5V | -40°C ~ 85°C | Obsolete | - |
| 74CBTLV3253PW,118 | Nexperia USA Inc. | 2 x 4:1 | 16-TSSOP | 2.3V ~ 3.6V | -40°C ~ 125°C | Active | Tape & Reel |
| CBT3253APW,118 | Nexperia USA Inc. | 2 x 4:1 | 16-TSSOP | 4.5V ~ 5.5V | -40°C ~ 85°C | Active | Tape & Reel |
| CBT3253PW,118 | Nexperia USA Inc. | 2 x 4:1 | 16-TSSOP | - | - | Active | Tape & Reel |
| SN74CBT3253PW | Texas Instruments | 2 x 4:1 | 16-TSSOP | 4.5V ~ 5.5V | -40°C ~ 85°C | Last Time Buy | Tube |
| CBT3253ADS,118 | Nexperia USA Inc. | 2 x 4:1 | 16-SSOP | 4.5V ~ 5.5V | -40°C ~ 85°C | Active | Tape & Reel |
| PI5C3253LE | Diodes Incorporated | 2 x 4:1 | 16-TSSOP | 4.75V ~ 5.25V | -40°C ~ 85°C | Last Time Buy | Tube |
| PI5C3253LEX | Diodes Incorporated | 2 x 4:1 | 16-TSSOP | 4.75V ~ 5.25V | -40°C ~ 85°C | Last Time Buy | Tape & Reel |
| PI5C3253QE | Diodes Incorporated | 2 x 4:1 | 16-QSOP | 4.75V ~ 5.25V | -40°C ~ 85°C | Active | Tube |
| QS3253QG | Renesas Electronics Corporation | 2 x 4:1 | 16-QSOP | 4.75V ~ 5.25V | -40°C ~ 85°C | Active | - |
| PI5C3257LE | Diodes Incorporated | 4 x 2:1 | 16-TSSOP | 4.75V ~ 5.25V | -40°C ~ 85°C | Last Time Buy | Tube |
Engineering Selection Recommendations
Preferred Direct Substitutes (Active Status, 16-TSSOP Package):
CBT3253APW,118 and SN74CBT3253PW are the primary recommendations for direct replacement. Both maintain the 2 x 4:1 circuit configuration, 16-TSSOP package footprint, and compatible voltage supply range (4.5V ~ 5.5V). CBT3253APW,118 is currently in active production status with 8498 units in stock, providing superior long-term availability. SN74CBT3253PW is classified as Last Time Buy, indicating limited future availability.
Alternative Direct Substitutes (16-TSSOP Package, Extended Temperature Range):
74CBTLV3253PW,118 offers an extended operating temperature range (-40°C to 125°C) and lower voltage supply range (2.3V ~ 3.6V). This part is suitable only if the application can operate within the lower voltage specification and does not require the original 4V minimum supply voltage.
Package Variant Substitutes (Functional Equivalents):
CBT3253ADS,118 provides identical electrical specifications in a 16-SSOP package (0.154" width versus 0.173" for TSSOP). This substitution requires PCB layout modification due to different pin spacing.
PI5C3253LE and PI5C3253LEX (Diodes Incorporated) maintain 16-TSSOP package compatibility with voltage supply range 4.75V ~ 5.25V. Both are classified as Last Time Buy.
PI5C3253QE and QS3253QG use 16-QSOP packages, requiring PCB redesign and are suitable only when package footprint flexibility exists.
Non-Recommended Substitutes:
PI5C3257LE has a different circuit configuration (4 x 2:1 instead of 2 x 4:1) and is not functionally equivalent without circuit redesign.
All substitute parts are ROHS3 compliant and have Moisture Sensitivity Level 1 (Unlimited), matching the original part specifications.
Frequently Asked Questions (FAQ)
Q: Can I use 74CBTLV3253PW,118 as a direct replacement for FST3253MTCX?
A: 74CBTLV3253PW,118 has the same 2 x 4:1 circuit configuration and 16-TSSOP package, but operates at a lower voltage supply range (2.3V ~ 3.6V) compared to the FST3253MTCX (4V ~ 5.5V). It is a direct substitute only if your application can operate within the 2.3V ~ 3.6V range. If your circuit requires 4V minimum supply voltage, this part is not suitable.
Q: What is the difference between CBT3253APW,118 and PI5C3253LE?
A: Both parts have identical 2 x 4:1 circuit configuration and 16-TSSOP package. The primary differences are: CBT3253APW,118 is manufactured by Nexperia and is in active production status with higher inventory (8498 units), while PI5C3253LE is manufactured by Diodes Incorporated and is classified as Last Time Buy. CBT3253APW,118 is the preferred choice for new designs due to active production status.
Q: Can I use PI5C3253QE or QS3253QG instead of FST3253MTCX?
A: Both parts have the correct 2 x 4:1 circuit configuration and compatible voltage/temperature specifications, but use 16-QSOP packages instead of 16-TSSOP. This requires PCB layout modification and is only viable if your design allows package footprint changes. For direct PCB compatibility, use parts in 16-TSSOP package.
Q: Why is PI5C3257LE listed as a similar substitute if it has a different circuit configuration?
A: PI5C3257LE has a 4 x 2:1 circuit configuration instead of 2 x 4:1. While it is a multiplexer/demultiplexer in the same package family, it is not functionally equivalent and requires circuit redesign. It is listed only for reference when alternative multiplexer configurations are acceptable.
Q: Are all substitute parts RoHS compliant?
A: Yes, all listed substitute parts are ROHS3 compliant and have Moisture Sensitivity Level 1 (Unlimited), matching the original FST3253MTCX specifications.
Q: What packaging format should I specify when ordering CBT3253APW,118?
A: CBT3253APW,118 is available in Tape & Reel (TR) packaging format, suitable for automated assembly processes. Verify packaging availability with your supplier, as some parts may be available in multiple formats (Tube, Tape & Reel).
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