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PI5A4157CEX Equivalent & Substitute Parts
Part Overview
The PI5A4157CEX is a single-circuit SPDT (Single Pole Double Throw) analog switch manufactured by Diodes Incorporated, designed for low-impedance signal routing applications. This device features a 1.2Ohm on-state resistance and operates across a 1.65V to 5.5V supply range, making it suitable for audio, video, and general-purpose analog switching in portable and battery-powered systems. The part is currently in Last Time Buy status, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Switch Circuit Configuration | SPDT (Single Pole Double Throw) |
| Multiplexer/Demultiplexer Circuit | 2:1 |
| Number of Circuits | 1 |
| On-State Resistance (Max) | 1.2Ohm |
| Channel-to-Channel Matching (ΔRon) | 10mOhm |
| Supply Voltage Range (V+) | 1.65V ~ 5.5V |
| Switch Time (Ton/Toff Max) | 18ns / 20ns |
| -3dB Bandwidth | 150MHz |
| Charge Injection | 35pC |
| Channel Capacitance (CS(off), CD(off)) | 4.6pF |
| Current - Leakage (IS(off) Max) | 20nA |
| Crosstalk | -70dB @ 1MHz |
| Operating Temperature Range | -40°C ~ 85°C |
| Package / Case | 6-TSSOP, SC-88, SOT-363 |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the PI5A4157CEX is determined by strict equivalence across the following critical parameters:
Primary Equivalence Criteria:
- Switch circuit configuration (SPDT 2:1)
- Single circuit topology
- On-state resistance performance (1.2Ohm nominal or lower)
- Supply voltage compatibility (minimum 1.65V support)
- Package compatibility (6-TSSOP/SC-88/SOT-363 family)
- RoHS3 compliance and MSL rating
Secondary Performance Considerations:
- Switch timing characteristics (Ton/Toff)
- Bandwidth performance (-3dB)
- Charge injection and leakage specifications
- Operating temperature range overlap
Substitute parts are grouped into two categories: parametric equivalents (matching all primary criteria with identical electrical performance) and manufacturer-recommended alternatives (meeting primary criteria with acceptable performance trade-offs for specific applications).
Parameter Comparison
| Manufacturer Part Number | Manufacturer | On-State Resistance (Max) | ΔRon (Max) | Supply Voltage (V+) | Ton/Toff (Max) | -3dB Bandwidth | Charge Injection | Leakage (IS(off) Max) | Crosstalk | Operating Temp | Product Status | Package |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PI5A4157CEX | Diodes Incorporated | 1.2Ohm | 10mOhm | 1.65V ~ 5.5V | 18ns / 20ns | 150MHz | 35pC | 20nA | -70dB @ 1MHz | -40°C ~ 85°C | Last Time Buy | SOT-363-6 |
| PI5A4157CEX-1516 | Diodes Incorporated | 1.2Ohm | 10mOhm | 1.65V ~ 5.5V | 18ns / 20ns | 150MHz | 35pC | 20nA | -70dB @ 1MHz | -40°C ~ 85°C | Active | SOT-363-6 |
| FSA4157P6X | onsemi | 1.15Ohm | 60mOhm | 1.65V ~ 5.5V | 35ns / 15ns | 300MHz | 20pC | 2nA (Typ) | -70dB @ 1MHz | -40°C ~ 85°C | Active | SC-88 |
| FSA4157AP6X | onsemi | 1.15Ohm | 60mOhm | 2.7V ~ 5.5V | 35ns / 15ns | 300MHz | 20pC | 2nA (Typ) | -70dB @ 1MHz | -40°C ~ 85°C | Active | SC-88 |
| FSA4159P6X | onsemi | 900mOhm | 50mOhm | 1.65V ~ 5.5V | 30ns / 20ns | 180MHz | 15pC | 10nA | -60dB @ 1MHz | -40°C ~ 85°C | Active | SC-88 |
| FSA5157P6X | onsemi | 360mOhm (Typ) | 40mOhm | 1.65V ~ 4.3V | 55ns / 30ns | 80MHz | 6pC | 10nA | -75dB @ 100kHz | -40°C ~ 85°C | Active | SC-88 |
| 1P1G3157QDCKRQ1 | Texas Instruments | 15Ohm | 100mOhm | 1.65V ~ 5.5V | 5.7ns / 3.8ns | 300MHz | 7pC | 1µA | -54dB @ 10MHz | -40°C ~ 125°C | Active | SC-70-6 |
| MAX4730EXT+T | Analog Devices Inc./Maxim Integrated | 5.5Ohm | 50mOhm | 1.8V ~ 5.5V | 45ns / 26ns | 300MHz | 3pC | 2nA | -67dB @ 1MHz | -40°C ~ 85°C | Active | SC-70-6 |
| NC7SB3157P6X | onsemi | 15Ohm | 150mOhm | 1.65V ~ 5.5V | 5.2ns / 4.6ns | 250MHz | 7pC | 100nA | -54dB @ 10MHz | -40°C ~ 85°C | Active | SC-88 |
| NC7SBU3157P6X | onsemi | 15Ohm | 150mOhm | 1.65V ~ 5.5V | 5.2ns / 4.6ns | 250MHz | 7pC | 100nA | -54dB @ 10MHz | -40°C ~ 85°C | Obsolete | SC-88 |
| NLASB3157DFT2G | onsemi | 7Ohm | 150mOhm | 1.65V ~ 5.5V | 5.2ns / 4.6ns | 250MHz | 7pC | 100nA | -54dB @ 10MHz | -55°C ~ 125°C | Obsolete | SC-88 |
Engineering Selection Recommendations
Parametric Equivalent (Direct Replacement):
PI5A4157CEX-1516 is the direct parametric equivalent, offering identical electrical specifications with active product status. This part maintains the same 1.2Ohm on-state resistance, 10mOhm channel matching, and 150MHz bandwidth. Selection of this part eliminates all performance trade-offs and is recommended for designs requiring exact specification compliance.
Primary Manufacturer-Recommended Alternatives:
FSA4157P6X and FSA4157AP6X (onsemi) provide superior performance characteristics with lower on-state resistance (1.15Ohm), improved bandwidth (300MHz), and reduced charge injection (20pC). Both parts maintain full 1.65V to 5.5V supply compatibility and -70dB crosstalk performance. FSA4157P6X supports the full 1.65V minimum supply; FSA4157AP6X requires 2.7V minimum. Both are in active production status with ROHS3 compliance and MSL-1 rating.
Secondary Alternatives for Specific Applications:
FSA4159P6X offers lower on-state resistance (900mOhm) with reduced charge injection (15pC) but with slightly lower bandwidth (180MHz) and crosstalk performance (-60dB @ 1MHz). Suitable for applications prioritizing low power consumption over high-frequency performance.
FSA5157P6X provides the lowest on-state resistance (360mOhm typical) with excellent crosstalk isolation (-75dB @ 100kHz) but operates within a reduced supply range (1.65V to 4.3V) and lower bandwidth (80MHz). Applicable only to designs operating within this voltage window.
1P1G3157QDCKRQ1 (Texas Instruments) features automotive-grade qualification (AEC-Q100) with extended operating temperature range (-40°C to 125°C). Higher on-state resistance (15Ohm) and leakage current (1µA) make this suitable for automotive applications where temperature performance and qualification status outweigh impedance considerations.
MAX4730EXT+T (Analog Devices/Maxim) offers excellent charge injection performance (3pC) and low leakage (2nA) with 300MHz bandwidth. Higher on-state resistance (5.5Ohm) and minimum supply voltage (1.8V) require application verification.
NC7SB3157P6X provides fast switching (5.2ns/4.6ns) with 250MHz bandwidth and is suitable for high-speed applications where the 15Ohm on-state resistance is acceptable.
Obsolete Parts (Not Recommended for New Designs):
NC7SBU3157P6X and NLASB3157DFT2G are obsolete and should not be selected for new designs. NLASB3157DFT2G offers extended temperature range (-55°C to 125°C) if legacy design support is required, but active alternatives with equivalent or superior performance are available.
Frequently Asked Questions (FAQ)
Q: Can PI5A4157CEX-1516 be used as a direct replacement for PI5A4157CEX?
A: Yes. PI5A4157CEX-1516 is a parametric equivalent with identical electrical specifications. The primary difference is product status: PI5A4157CEX is Last Time Buy while PI5A4157CEX-1516 is Active. Both parts meet the same performance requirements and are pin-compatible in the SOT-363-6 package.
Q: What is the key difference between FSA4157P6X and FSA4157AP6X?
A: Both parts are electrically identical with 1.15Ohm on-state resistance and 300MHz bandwidth. The primary difference is supply voltage range: FSA4157P6X operates from 1.65V to 5.5V, while FSA4157AP6X operates from 2.7V to 5.5V. FSA4157P6X is recommended for designs requiring lower supply voltage support.
Q: Why does 1P1G3157QDCKRQ1 have higher on-state resistance (15Ohm) compared to the PI5A4157CEX (1.2Ohm)?
A: 1P1G3157QDCKRQ1 is an automotive-grade part with AEC-Q100 qualification and extended operating temperature range (-40°C to 125°C). The higher on-state resistance is a trade-off for automotive reliability and temperature performance. This part is suitable only for automotive applications where qualification status is required.
Q: Can FSA5157P6X be used in all applications where PI5A4157CEX is specified?
A: No. FSA5157P6X operates within a reduced supply voltage range (1.65V to 4.3V) compared to PI5A4157CEX (1.65V to 5.5V). This part is suitable only for designs operating within the 1.65V to 4.3V window. Additionally, the lower bandwidth (80MHz) and higher on-state resistance (360mOhm) may not meet all application requirements.
Q: Are all substitute parts available in the same package as PI5A4157CEX?
A: PI5A4157CEX is supplied in SOT-363-6 (SC-70) package. Most substitute parts are available in SC-88 or SC-70-6 variants, which are mechanically and electrically compatible within the 6-TSSOP/SC-88/SOT-363 family. Verify specific package availability with the supplier before design implementation.
Q: What is the significance of the -70dB crosstalk specification in PI5A4157CEX?
A: Crosstalk at -70dB @ 1MHz indicates signal isolation between switch channels. This specification is critical for audio and video applications where channel separation must be maintained. FSA4157P6X and FSA4157AP6X maintain identical -70dB crosstalk performance. Parts with lower crosstalk performance (such as NC7SB3157P6X at -54dB @ 10MHz) may introduce measurable cross-channel interference in sensitive applications.
Q: Is RoHS3 compliance maintained across all substitute parts?
A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL-1 (Unlimited) moisture sensitivity rating, matching the environmental compliance profile of PI5A4157CEX.
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