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FST3257MTC Equivalent & Substitute Parts
Part Overview
The FST3257MTC is a 4 x 2:1 Multiplexer/Demultiplexer logic IC manufactured by onsemi in a 16-TSSOP surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. The FST3257MTC operates across a single supply voltage range of 3V to 5.5V with an operating temperature range of -40°C to 85°C, serving applications requiring signal multiplexing and demultiplexing functions in logic circuits.
Substiute Parts
Key Parameters
| Parameter | FST3257MTC |
|---|---|
| Manufacturer | onsemi |
| Type | Multiplexer/Demultiplexer |
| Circuit Configuration | 4 x 2:1 |
| Independent Circuits | 1 |
| Voltage Supply Source | Single Supply |
| Voltage - Supply Range | 3V ~ 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
Substitute parts for the FST3257MTC are classified into two categories based on electrical and mechanical compatibility:
Direct Substitutes maintain identical electrical specifications and package form factors:
- 74FST3257DTR2G (onsemi, 74FST series, Tape & Reel packaging)
- SN74CBT3257PW (Texas Instruments, 74CBT series, Tube packaging)
- SN74CBT3257PWR (Texas Instruments, 74CBT series, Tape & Reel packaging)
Similar Substitutes share the same circuit configuration and pin count but may have minor package variations or different voltage supply ranges:
- CBT3257ADS,118 (Nexperia, 16-SSOP package variant)
- CBT3257APW,118 (Nexperia, 16-TSSOP package)
- PI5C3257LE (Diodes Incorporated, 16-TSSOP package, Tube)
- PI5C3257LEX (Diodes Incorporated, 16-TSSOP package, Tape & Reel)
- SN74CBT3257CDBR (Texas Instruments, 16-SSOP package variant)
- SN74CBT3257CPW (Texas Instruments, 16-TSSOP package, Tube)
- SN74CBT3257CPWR (Texas Instruments, 16-TSSOP package, Cut Tape & Digi-Reel)
Substitution eligibility is determined by: circuit configuration (4 x 2:1), independent circuits (1), mounting type (Surface Mount), voltage supply source (Single Supply), operating temperature range (-40°C ~ 85°C), and package compatibility (16-TSSOP or 16-SSOP).
Parameter Comparison
| Part Number | Manufacturer | Series | Circuit | Voltage Supply | Package / Case | Packaging Type | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|
| FST3257MTC | onsemi | - | 4 x 2:1 | 3V ~ 5.5V | 16-TSSOP (0.173", 4.40mm) | - | Obsolete | - |
| 74FST3257DTR2G | onsemi | 74FST | 4 x 2:1 | 4V ~ 5.5V | 16-TSSOP (0.173", 4.40mm) | Tape & Reel (TR) | Last Time Buy | ROHS3 Compliant |
| SN74CBT3257PW | Texas Instruments | 74CBT | 4 x 2:1 | 4.5V ~ 5.5V | 16-TSSOP (0.173", 4.40mm) | Tube | Last Time Buy | ROHS3 Compliant |
| SN74CBT3257PWR | Texas Instruments | 74CBT | 4 x 2:1 | 4.5V ~ 5.5V | 16-TSSOP (0.173", 4.40mm) | Tape & Reel (TR) | Last Time Buy | ROHS3 Compliant |
| CBT3257ADS,118 | Nexperia USA Inc. | 74CBT | 4 x 2:1 | 4.5V ~ 5.5V | 16-SSOP (0.154", 3.90mm) | Tape & Reel (TR) | Active | ROHS3 Compliant |
| CBT3257APW,118 | Nexperia USA Inc. | 74CBT | 4 x 2:1 | 4.5V ~ 5.5V | 16-TSSOP (0.173", 4.40mm) | Tape & Reel (TR) | Active | ROHS3 Compliant |
| PI5C3257LE | Diodes Incorporated | - | 4 x 2:1 | 4.75V ~ 5.25V | 16-TSSOP (0.173", 4.40mm) | Tube | Last Time Buy | ROHS3 Compliant |
| PI5C3257LEX | Diodes Incorporated | - | 4 x 2:1 | 4.75V ~ 5.25V | 16-TSSOP (0.173", 4.40mm) | Tape & Reel (TR) | Last Time Buy | ROHS3 Compliant |
| SN74CBT3257CDBR | Texas Instruments | 74CBT | 4 x 2:1 | 4.5V ~ 5.5V | 16-SSOP (0.209", 5.30mm) | Tape & Reel (TR) | Active | ROHS3 Compliant |
| SN74CBT3257CPW | Texas Instruments | 74CBT | 4 x 2:1 | 4.5V ~ 5.5V | 16-TSSOP (0.173", 4.40mm) | Tube | Active | ROHS3 Compliant |
| SN74CBT3257CPWR | Texas Instruments | 74CBT | 4 x 2:1 | 4.5V ~ 5.5V | 16-TSSOP (0.173", 4.40mm) | Cut Tape (CT) & Digi-Reel® | Active | ROHS3 Compliant |
Engineering Selection Recommendations
For new designs and production applications requiring FST3257MTC replacement, the following selection criteria apply:
Active Product Status Priority: CBT3257APW,118 (Nexperia), SN74CBT3257CDBR (Texas Instruments), SN74CBT3257CPW (Texas Instruments), and SN74CBT3257CPWR (Texas Instruments) are classified as Active products, ensuring long-term availability and manufacturing support.
Identical Package Compatibility: Parts maintaining the 16-TSSOP (0.173", 4.40mm Width) package form factor provide direct PCB layout compatibility without redesign: 74FST3257DTR2G, SN74CBT3257PW, SN74CBT3257PWR, CBT3257APW,118, PI5C3257LE, PI5C3257LEX, SN74CBT3257CPW, and SN74CBT3257CPWR.
Voltage Supply Range Considerations: The original FST3257MTC operates at 3V ~ 5.5V. Substitute parts operate within narrower ranges: 74FST3257DTR2G (4V ~ 5.5V), Texas Instruments 74CBT series (4.5V ~ 5.5V), and Diodes PI5C3257 series (4.75V ~ 5.25V). Design voltage specifications must accommodate these ranges.
RoHS3 Compliance: All substitute parts listed are ROHS3 Compliant, meeting environmental and regulatory requirements for modern manufacturing.
Packaging Format: Selection between Tube, Tape & Reel (TR), and Cut Tape (CT) & Digi-Reel packaging depends on production volume and assembly line requirements.
Frequently Asked Questions (FAQ)
Q: Can I use SN74CBT3257PWR as a direct replacement for FST3257MTC?
A: SN74CBT3257PWR is electrically compatible with identical circuit configuration (4 x 2:1) and package form factor (16-TSSOP). However, the voltage supply range differs: FST3257MTC operates at 3V ~ 5.5V while SN74CBT3257PWR operates at 4.5V ~ 5.5V. Substitution is valid only if your circuit design operates within the 4.5V ~ 5.5V range.
Q: What is the difference between 16-TSSOP and 16-SSOP packages?
A: Both are 16-pin surface mount packages with different body widths. 16-TSSOP measures 0.173" (4.40mm) width, while 16-SSOP measures either 0.154" (3.90mm) or 0.209" (5.30mm) width depending on variant. PCB footprints differ; verify layout compatibility before substitution.
Q: Why do some substitutes have narrower voltage ranges than the original FST3257MTC?
A: Different manufacturers design their multiplexer/demultiplexer circuits with varying voltage specifications. The FST3257MTC's 3V ~ 5.5V range is broader than most substitutes. Select substitutes based on your actual circuit operating voltage to ensure reliable operation.
Q: Are all listed substitutes RoHS compliant?
A: All substitute parts listed are ROHS3 Compliant. The original FST3257MTC does not specify RoHS status in the provided data.
Q: Which substitute offers the best long-term availability?
A: Parts with Active product status provide the longest availability: CBT3257APW,118 (Nexperia), SN74CBT3257CDBR, SN74CBT3257CPW, and SN74CBT3257CPWR (all Texas Instruments). Last Time Buy parts (74FST3257DTR2G, SN74CBT3257PW, SN74CBT3257PWR, PI5C3257LE, PI5C3257LEX) have limited production windows.
Q: Can I mix packaging types in production?
A: Yes, if the electrical specifications and package form factors are identical. For example, SN74CBT3257PW (Tube) and SN74CBT3257PWR (Tape & Reel) are electrically identical; packaging selection depends on assembly line automation requirements.
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