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NLASB3157DFT2 Equivalent & Substitute Parts
Part Overview
The NLASB3157DFT2 is a single-circuit SPDT (Single Pole Double Throw) analog switch IC manufactured by onsemi, housed in a 6-TSSOP/SC-88/SOT-363 package. This component functions as a 2:1 multiplexer/demultiplexer with 7Ohm on-state resistance and operates across a 1.65V to 5.5V supply range. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Switch Circuit Type | SPDT |
| Multiplexer/Demultiplexer Configuration | 2:1 |
| Number of Circuits | 1 |
| On-State Resistance (Max) | 7Ohm |
| Channel-to-Channel Matching (ΔRon) | 150mOhm |
| Supply Voltage Range (V+) | 1.65V ~ 5.5V |
| Switch Time (Ton/Toff) | 5.2ns / 4.6ns |
| -3dB Bandwidth | 250MHz |
| Charge Injection | 7pC |
| Channel Capacitance (CS(off), CD(off)) | 6.5pF |
| Leakage Current (IS(off)) Max | 100nA |
| Crosstalk | -54dB @ 10MHz |
| Operating Temperature Range | -55°C ~ 125°C |
| Package Type | 6-TSSOP, SC-88, SOT-363 |
| RoHS Status | RoHS non-compliant |
| MSL Rating | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the NLASB3157DFT2 is determined by the following critical parameters:
Primary Compatibility Criteria:
- Switch circuit type: SPDT
- Multiplexer configuration: 2:1
- Number of circuits: 1 (single circuit)
- Package compatibility: 6-TSSOP, SC-88, or SOT-363 footprint
- Supply voltage range: Must encompass or be compatible with 1.65V ~ 5.5V
- Operating temperature range: Must support -55°C ~ 125°C or be suitable for the intended application temperature window
Secondary Performance Parameters:
- On-state resistance: Acceptable range depends on circuit application; lower resistance values provide improved signal integrity
- Switch timing (Ton/Toff): Critical for high-speed switching applications
- Bandwidth: Minimum 250MHz recommended for signal fidelity
- Leakage current: Lower values preferred for low-power applications
- Channel capacitance: Affects signal distortion in RF/analog applications
Substitute parts are grouped into two categories: direct functional equivalents (matching all primary criteria with comparable performance) and performance-enhanced alternatives (improved specifications while maintaining compatibility).
Parameter Comparison
| Part Number | Manufacturer | Switch Type | Ron (Max) | ΔRon | V+ Range | Ton/Toff (ns) | BW (MHz) | IS(off) Max | Temp Range | Status | RoHS |
|---|---|---|---|---|---|---|---|---|---|---|---|
| NLASB3157DFT2 | onsemi | SPDT | 7Ohm | 150mOhm | 1.65V~5.5V | 5.2/4.6 | 250 | 100nA | -55~125°C | Obsolete | Non-compliant |
| FSA4157AP6X | onsemi | SPDT | 1.15Ohm | 60mOhm | 2.7V~5.5V | 35/15 | 300 | 2nA (Typ) | -40~85°C | Active | ROHS3 |
| NC7SB3157P6X | onsemi | SPDT | 15Ohm | 150mOhm | 1.65V~5.5V | 5.2/4.6 | 250 | 100nA | -40~85°C | Active | ROHS3 |
| NC7SBU3157P6X | onsemi | SPDT | 15Ohm | 150mOhm | 1.65V~5.5V | 5.2/4.6 | 250 | 100nA | -40~85°C | Obsolete | ROHS3 |
| 1P1G3157QDCKRQ1 | Texas Instruments | SPDT | 15Ohm | 100mOhm | 1.65V~5.5V | 5.7/3.8 | 300 | 1µA | -40~125°C | Active | ROHS3 |
| 74LVC1G3157GW,125 | Nexperia USA Inc. | SPDT | 10Ohm | — | 1.65V~5.5V | 4/4.6 | 300 | 5µA | -40~125°C | Active | ROHS3 |
| 74LVC1G3157GW-Q10H | Nexperia USA Inc. | SPDT | 10Ohm | — | 1.65V~5.5V | 4/4.6 | 300 | 5µA | -40~125°C | Active | ROHS3 |
| PI5A3157CEX | Diodes Incorporated | SPDT | 13Ohm | 150mOhm | 1.65V~5.5V | 5.2/4.6 | 250 | 100nA | -40~85°C | Active | ROHS3 |
| PI5A4157CEX | Diodes Incorporated | SPDT | 1.2Ohm | 10mOhm | 1.65V~5.5V | 18/20 | 150 | 20nA | -40~85°C | Last Time Buy | ROHS3 |
| SN74LVC1G3157DCKR | UMW | SPDT | 7Ohm (Typ) | 150mOhm (Typ) | 1.65V~5.5V | 5.2/4.6 | 350 | 100nA (Max) | -55~125°C | Active | ROHS3 |
| STG3157CTR | STMicroelectronics | SPDT | 15Ohm | 100mOhm | 1.65V~4.3V | 15/10 | 250 | 100nA | -55~125°C | Active | ROHS3 |
Engineering Selection Recommendations
Tier 1 - Direct Functional Equivalents (Recommended for Obsolete Part Replacement):
SN74LVC1G3157DCKR (UMW) provides the closest electrical match to NLASB3157DFT2. It maintains identical on-state resistance (7Ohm typical), matching channel-to-channel resistance (150mOhm), identical supply voltage range (1.65V~5.5V), and identical switch timing specifications (5.2ns/4.6ns). Operating temperature range extends to -55°C ~ 125°C, matching the original part. RoHS3 compliance and active product status ensure long-term availability. Package compatibility is confirmed in SC70-6 format.
Tier 2 - Performance-Enhanced Alternatives (Active Production):
NC7SB3157P6X (onsemi) maintains electrical compatibility with identical supply voltage range, switch timing, and leakage current specifications. On-state resistance is doubled to 15Ohm, acceptable for applications where signal loss is not critical. Active product status and RoHS3 compliance provide supply chain stability. Temperature range is limited to -40°C ~ 85°C.
74LVC1G3157GW,125 and 74LVC1G3157GW-Q10H (Nexperia) offer improved switch timing (4ns Ton) and higher bandwidth (300MHz). On-state resistance of 10Ohm represents a middle ground between the original 7Ohm and higher-resistance alternatives. Both are active products with RoHS3 compliance and automotive qualification available (Q10H variant).
Tier 3 - Low-Resistance Alternatives (High-Performance Applications):
FSA4157AP6X (onsemi) and PI5A4157CEX (Diodes) provide significantly lower on-state resistance (1.15Ohm and 1.2Ohm respectively), beneficial for low-signal-level applications. FSA4157AP6X is active; PI5A4157CEX is Last Time Buy status. Both require minimum supply voltage of 2.7V and 1.65V respectively, with temperature ranges limited to -40°C ~ 85°C.
Tier 4 - Extended Temperature Range Options:
1P1G3157QDCKRQ1 (Texas Instruments) and STG3157CTR (STMicroelectronics) support -55°C ~ 125°C operating range matching the original part. Both are active products with RoHS3 compliance and automotive qualification. STG3157CTR has a reduced supply voltage maximum of 4.3V, which may limit compatibility in 5.5V systems.
Frequently Asked Questions (FAQ)
Q: Can I use a substitute part with higher on-state resistance than the original NLASB3157DFT2?
A: Yes, if your circuit design permits. The NLASB3157DFT2 specifies 7Ohm maximum. Substitutes with 10Ohm, 13Ohm, or 15Ohm on-state resistance are electrically compatible but introduce proportionally higher signal attenuation. Verify that your signal levels and impedance matching remain within acceptable limits for your application.
Q: What is the impact of supply voltage range differences?
A: The original part operates from 1.65V to 5.5V. Some substitutes (FSA4157AP6X) require minimum 2.7V supply. If your design uses 1.65V to 2.6V operation, these parts are incompatible. Verify your actual supply voltage range before selection. STG3157CTR has a maximum supply of 4.3V, unsuitable for 5.5V systems.
Q: Are all substitute parts RoHS3 compliant?
A: No. The original NLASB3157DFT2 is RoHS non-compliant. All listed substitutes are RoHS3 compliant. If your application requires RoHS non-compliant components, substitutes are not suitable. Verify compliance requirements with your procurement and regulatory teams.
Q: Which substitute is best for automotive applications?
A: 1P1G3157QDCKRQ1 (Texas Instruments) and 74LVC1G3157GW-Q10H (Nexperia) carry AEC-Q100 automotive qualification. Both are active products with extended temperature ranges (-40°C ~ 125°C). Select based on your specific on-state resistance and switching speed requirements.
Q: Can I use PI5A4157CEX as a direct replacement?
A: PI5A4157CEX is electrically compatible but has Last Time Buy status, indicating discontinued production. While currently available, future procurement may be impossible. Use only if immediate availability is critical and long-term supply is not required. SN74LVC1G3157DCKR or NC7SB3157P6X are preferred for ongoing production designs.
Q: What is the difference between SC-88, SC-70-6, and SOT-363 packages?
A: These are equivalent package designations for the same 6-pin surface-mount form factor. SC-88 and SC-70-6 are onsemi nomenclature; SOT-363 is the industry standard designation. All listed substitutes are footprint-compatible. Verify your PCB layout supports the specific supplier device package variant.
Q: Does operating temperature range affect substitution?
A: Yes. The original part operates -55°C ~ 125°C. Substitutes with -40°C ~ 85°C range are unsuitable for applications requiring full -55°C ~ 125°C operation. For extended temperature requirements, select SN74LVC1G3157DCKR, 1P1G3157QDCKRQ1, or STG3157CTR.
Q: What is channel-to-channel matching (ΔRon) and why does it matter?
A: ΔRon specifies the maximum resistance variation between the two switch channels. Lower values (10mOhm to 60mOhm) indicate better matching, critical for balanced signal routing and reduced crosstalk in multiplexed applications. The original part specifies 150mOhm. Most substitutes maintain this specification or improve it.
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