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FSA3157P6X Equivalent & Substitute Parts
Part Overview
The FSA3157P6X is a single-circuit SPDT (Single Pole Double Throw) analog switch manufactured by onsemi, housed in a 6-pin SC-88 (SOT-363) surface mount package. This component operates across a supply voltage range of 1.65V to 5.5V with a maximum on-state resistance of 15Ohm and is designed for signal routing and multiplexing applications in low-voltage digital and analog systems.
The FSA3157P6X is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this component.
Substiute Parts
Key Parameters
| Parameter | FSA3157P6X |
|---|---|
| Manufacturer | onsemi |
| Switch Circuit | SPDT |
| Multiplexer/Demultiplexer Circuit | 2:1 |
| Number of Circuits | 1 |
| On-State Resistance (Max) | 15Ohm |
| Channel-to-Channel Matching (ΔRon) | 150mOhm |
| Voltage - Supply, Single (V+) | 1.65V ~ 5.5V |
| Switch Time (Ton, Toff) (Max) | 5.7ns, 3.8ns |
| -3dB Bandwidth | 250MHz |
| Charge Injection | 7pC |
| Channel Capacitance (CS(off), CD(off)) | 6.5pF |
| Current - Leakage (IS(off)) (Max) | 100nA |
| Crosstalk | -54dB @ 10MHz |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 6-TSSOP, SC-88, SOT-363 |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the FSA3157P6X is determined by the following critical parameters:
- Switch Circuit Type: SPDT configuration for single-pole switching functionality
- Circuit Count: Single circuit (1x) requirement
- Supply Voltage Compatibility: 1.65V ~ 5.5V operating range
- On-State Resistance: Maximum 15Ohm specification
- Package Compatibility: SC-88 (SOT-363) or equivalent 6-pin surface mount packages
- Switching Performance: Switch time and bandwidth characteristics within acceptable operational margins
- Leakage Current: Maximum 100nA specification for low-power applications
- Environmental Compliance: ROHS3 compliance and MSL 1 rating
Substitute parts are grouped into two categories based on electrical compatibility:
Category A - Direct Electrical Equivalents (15Ohm On-State Resistance): Parts maintaining the 15Ohm maximum on-state resistance specification with compatible switching characteristics and supply voltage range.
Category B - Performance-Enhanced Alternatives (Lower On-State Resistance): Parts with reduced on-state resistance (10Ohm or lower) offering improved signal integrity and reduced power dissipation, suitable for applications where lower resistance is beneficial.
Parameter Comparison
| Part Number | Manufacturer | On-State Resistance (Max) | ΔRon | Switch Time Ton/Toff (Max) | -3dB Bandwidth | Leakage Current (Max) | Operating Temp | Package | Product Status |
|---|---|---|---|---|---|---|---|---|---|
| FSA3157P6X | onsemi | 15Ohm | 150mOhm | 5.7ns, 3.8ns | 250MHz | 100nA | -40°C ~ 85°C | SC-88 (SOT-363) | Obsolete |
| NC7SB3157P6X | onsemi | 15Ohm | 150mOhm | 5.2ns, 4.6ns | 250MHz | 100nA | -40°C ~ 85°C | SC-88 (SOT-363) | Active |
| TS5A3157DBVR | Texas Instruments | 10Ohm | 150mOhm | 8.5ns, 6.5ns | 300MHz | 100nA | -40°C ~ 85°C | SOT-23-6 | Active |
| STG3157CTR | STMicroelectronics | 15Ohm | 100mOhm | 15ns, 10ns | 250MHz | 100nA | -55°C ~ 125°C | SOT-323-6L | Active |
| 1P1G3157QDCKRQ1 | Texas Instruments | 15Ohm | 100mOhm | 5.7ns, 3.8ns | 300MHz | 1µA | -40°C ~ 125°C | SC-70-6 | Active |
| 74LVC1G3157DW-7 | Diodes Incorporated | 10Ohm | 250mOhm | 4ns, 7.5ns | 300MHz | 1µA | -40°C ~ 125°C | SOT-363 | Active |
| 74LVC1G3157GW,125 | Nexperia USA Inc. | 10Ohm | - | 4ns, 4.6ns | 300MHz | 5µA | -40°C ~ 125°C | 6-TSSOP | Active |
| PI5A3157CEX | Diodes Incorporated | 13Ohm | 150mOhm | 5.2ns, 4.6ns | 250MHz | 100nA | -40°C ~ 85°C | SOT-363-6 (SC-70) | Active |
| PI5A4157CEX | Diodes Incorporated | 1.2Ohm | 10mOhm | 18ns, 20ns | 150MHz | 20nA | -40°C ~ 85°C | SOT-363-6 (SC-70) | Last Time Buy |
| PI5A4157CEX-1516 | Diodes Incorporated | 1.2Ohm | 10mOhm | 18ns, 20ns | 150MHz | 20nA | -40°C ~ 85°C | SOT-363-6 (SC-70) | Active |
| SN74LVC1G3157DCKR | UMW | 7Ohm (Typ) | 150mOhm (Typ) | 5.2ns, 4.6ns | 350MHz | 100nA (Max) | -55°C ~ 125°C | SC70-6 | Active |
Engineering Selection Recommendations
Primary Recommendation - Direct Equivalent:
NC7SB3157P6X (onsemi) is the preferred direct replacement for FSA3157P6X. Both components are manufactured by onsemi, maintain identical electrical specifications (15Ohm on-state resistance, 150mOhm matching, 100nA leakage), operate across the same supply voltage range (1.65V ~ 5.5V), and are housed in the SC-88 (SOT-363) package. NC7SB3157P6X is currently in active production status, ensuring long-term supply availability. This substitution requires no circuit modifications and provides pin-for-pin compatibility.
Secondary Recommendations - Electrical Equivalents with Extended Temperature Range:
STG3157CTR (STMicroelectronics) and 1P1G3157QDCKRQ1 (Texas Instruments) maintain the 15Ohm on-state resistance specification and are suitable for applications requiring extended operating temperature ranges (-55°C to 125°C). Both components are ROHS3 compliant and in active production. Package differences (SOT-323-6L and SC-70-6 respectively) require PCB layout verification prior to implementation.
Alternative Options - Performance-Enhanced Substitutes:
74LVC1G3157DW-7 (Diodes Incorporated), 74LVC1G3157GW,125 (Nexperia USA Inc.), and SN74LVC1G3157DCKR (UMW) offer reduced on-state resistance (7Ohm to 10Ohm) and extended temperature operating ranges. These components are suitable for applications where lower on-state resistance reduces power dissipation and improves signal integrity. Package variations require PCB redesign consideration.
PI5A3157CEX (Diodes Incorporated) provides a 13Ohm on-state resistance specification with performance characteristics closely aligned to the FSA3157P6X, offering an intermediate substitution option with active product status.
Not Recommended for Direct Substitution:
PI5A4157CEX and PI5A4157CEX-1516 (Diodes Incorporated) feature significantly reduced on-state resistance (1.2Ohm) and altered switching characteristics (18ns/20ns switch times, 150MHz bandwidth). These components are designed for low-impedance switching applications and are not suitable as direct replacements for standard-impedance designs. PI5A4157CEX is classified as Last Time Buy, limiting future availability.
Frequently Asked Questions (FAQ)
Q: Can NC7SB3157P6X be used as a direct replacement for FSA3157P6X without circuit modifications?
A: Yes. NC7SB3157P6X is a direct pin-for-pin equivalent manufactured by onsemi with identical electrical specifications, supply voltage range, on-state resistance, and SC-88 (SOT-363) package. No circuit modifications are required.
Q: What is the primary difference between FSA3157P6X and the 74LVC series substitutes?
A: The 74LVC series (74LVC1G3157DW-7, 74LVC1G3157GW,125) feature reduced on-state resistance (10Ohm versus 15Ohm), extended operating temperature range (-40°C to 125°C versus -40°C to 85°C), and higher bandwidth (300MHz versus 250MHz). These differences result in improved switching performance but require package compatibility verification.
Q: Are package differences between SC-88 and SOT-363 significant for substitution?
A: SC-88 and SOT-363 are equivalent package designations for the same 6-pin surface mount configuration. However, other package variants (SOT-23-6, SOT-323-6L, SC-70-6) have different pin layouts and footprints. PCB layout verification is required before implementing substitutes with alternative package designations.
Q: Why is PI5A4157CEX not recommended as a substitute despite being listed in the original part's substitute list?
A: PI5A4157CEX features significantly different electrical characteristics: 1.2Ohm on-state resistance (versus 15Ohm), 18ns/20ns switch times (versus 5.7ns/3.8ns), and 150MHz bandwidth (versus 250MHz). These specifications indicate a different application class (low-impedance switching) and are not suitable for designs requiring standard-impedance SPDT switching.
Q: What supply voltage compatibility should be verified when selecting a substitute?
A: All recommended substitutes operate across the 1.65V to 5.5V supply voltage range, matching the FSA3157P6X specification. However, some alternatives (STG3157CTR, 1P1G3157QDCKRQ1, 74LVC series) support extended temperature ranges. Verify that the selected substitute's supply voltage specification matches your application requirements.
Q: Is the 1P1G3157QDCKRQ1 suitable for automotive applications?
A: Yes. The 1P1G3157QDCKRQ1 is qualified to AEC-Q100 automotive standards with extended operating temperature range (-40°C to 125°C). This component is appropriate for automotive and industrial applications requiring enhanced temperature performance and reliability certifications.
Q: What leakage current specifications should be considered when selecting a substitute?
A: FSA3157P6X specifies maximum leakage current of 100nA. Most recommended substitutes maintain this specification. However, 74LVC1G3157DW-7, 74LVC1G3157GW,125, and 1P1G3157QDCKRQ1 specify 1µA maximum leakage. For low-power applications sensitive to leakage current, verify that the selected substitute's leakage specification meets design requirements.
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