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NLASB3157DFT2G Equivalent & Substitute Parts
Part Overview
The NLASB3157DFT2G is a single-circuit SPDT (Single Pole Double Throw) analog switch manufactured by onsemi, housed in a 6-TSSOP SC-88 package. This interface IC operates across a supply voltage range of 1.65V to 5.5V with a maximum on-state resistance of 7Ohm and supports switching frequencies up to 250MHz. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | NLASB3157DFT2G |
| Manufacturer | onsemi |
| Switch Circuit Type | SPDT |
| Multiplexer/Demultiplexer Circuit | 2:1 |
| Number of Circuits | 1 |
| On-State Resistance (Max) | 7Ohm |
| Channel-to-Channel Matching (ΔRon) | 150mOhm |
| Voltage - Supply, Single (V+) | 1.65V ~ 5.5V |
| Switch Time (Ton, Toff) (Max) | 5.2ns, 4.6ns |
| -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 | -55°C ~ 125°C (TA) |
| Package / Case | 6-TSSOP, SC-88, SOT-363 |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the NLASB3157DFT2G is determined by the following critical parameters:
Primary Compatibility Criteria:
- Switch circuit type: SPDT
- Multiplexer/Demultiplexer circuit: 2:1
- Number of circuits: 1
- Package compatibility: 6-TSSOP, SC-88, SOT-363 family
- Supply voltage range: Minimum 1.65V ~ 5.5V (or subset thereof)
- On-state resistance: Within acceptable application tolerance
- Operating temperature range: Minimum -55°C ~ 125°C (or subset thereof)
Substitution Categories:
Category A - Direct Functional Equivalents (Obsolete to Active): Parts with identical or superior electrical characteristics and matching package specifications, suitable for direct replacement in new designs and production.
Category B - Compatible Alternatives (Performance Trade-offs): Parts with different on-state resistance or switching characteristics but compatible supply voltage, package, and temperature ranges. Selection depends on application-specific performance requirements.
Category C - Last-Time-Buy / Transitional Parts: Parts with active or last-time-buy status that provide functional compatibility but may have limited availability.
Parameter Comparison
| Part Number | Manufacturer | Status | Ron (Max) Ohm | ΔRon (mOhm) | V+ (V) | Ton/Toff (ns) | BW (-3dB) MHz | Charge Injection (pC) | Temp Range (°C) | Package |
|---|---|---|---|---|---|---|---|---|---|---|
| NLASB3157DFT2G | onsemi | Obsolete | 7 | 150 | 1.65-5.5 | 5.2, 4.6 | 250 | 7 | -55 to 125 | SC-88 |
| FSA4157AP6X | onsemi | Active | 1.15 | 60 | 2.7-5.5 | 35, 15 | 300 | 20 | -40 to 85 | SC-88 |
| NC7SB3157P6X | onsemi | Active | 15 | 150 | 1.65-5.5 | 5.2, 4.6 | 250 | 7 | -40 to 85 | SC-88 |
| NC7SBU3157P6X | onsemi | Obsolete | 15 | 150 | 1.65-5.5 | 5.2, 4.6 | 250 | 7 | -40 to 85 | SC-88 |
| 74LVC1G3157DW-7 | Diodes Incorporated | Active | 10 | 250 | 1.65-5.5 | 4, 7.5 | 300 | 7 | -40 to 125 | SOT-363 |
| 1P1G3157QDCKRQ1 | Texas Instruments | Active | 15 | 100 | 1.65-5.5 | 5.7, 3.8 | 300 | 7 | -40 to 125 | SC-70-6 |
| 74LVC1G3157GW,125 | Nexperia USA Inc. | Active | 10 | — | 1.65-5.5 | 4, 4.6 | 300 | 7.5 | -40 to 125 | 6-TSSOP |
| 74LVC1G3157GW-Q10H | Nexperia USA Inc. | Active | 10 | — | 1.65-5.5 | 4, 4.6 | 300 | 7.5 | -40 to 125 | 6-TSSOP |
| PI5A3157CEX | Diodes Incorporated | Active | 13 | 150 | 1.65-5.5 | 5.2, 4.6 | 250 | 7 | -40 to 85 | SOT-363-6 |
| PI5A4157CEX | Diodes Incorporated | Last Time Buy | 1.2 | 10 | 1.65-5.5 | 18, 20 | 150 | 35 | -40 to 85 | SOT-363-6 |
| SN74LVC1G3157DCKR | UMW | Active | 7 | 150 | 1.65-5.5 | 5.2, 4.6 | 350 | 7 | -55 to 125 | SC70-6 |
Engineering Selection Recommendations
For Direct Replacement (Obsolete to Active Transition):
SN74LVC1G3157DCKR (UMW) provides the closest functional match to NLASB3157DFT2G. Both devices share identical on-state resistance (7Ohm), channel-to-channel matching (150mOhm), switching times, charge injection, and operating temperature range (-55°C to 125°C). The SN74LVC1G3157DCKR is actively produced and ROHS3 compliant, making it suitable for production continuity. Package compatibility requires verification: NLASB3157DFT2G uses SC-88 while SN74LVC1G3157DCKR uses SC70-6, though both are within the 6-TSSOP/SOT-363 family.
For Applications Requiring Extended Temperature Range:
74LVC1G3157GW,125 and 74LVC1G3157GW-Q10H (Nexperia USA Inc.) maintain the full -40°C to 125°C operating range with active product status. These devices feature 10Ohm on-state resistance and improved switching performance (4ns Ton). The 6-TSSOP package provides direct mechanical compatibility. The -Q10H variant includes AEC-Q100 automotive qualification.
For Low-Resistance Applications:
FSA4157AP6X (onsemi) offers significantly lower on-state resistance (1.15Ohm) with superior channel matching (60mOhm) and higher bandwidth (300MHz). This part is suitable for applications where lower insertion loss is critical. Note the reduced operating temperature range (-40°C to 85°C) and minimum supply voltage increase to 2.7V.
For Automotive and High-Reliability Applications:
1P1G3157QDCKRQ1 (Texas Instruments) and 74LVC1G3157GW-Q10H (Nexperia) both carry AEC-Q100 automotive qualification. Both support the full 1.65V to 5.5V supply range and -40°C to 125°C temperature range. The Texas Instruments part offers 15Ohm resistance with superior channel matching (100mOhm), while the Nexperia part provides 10Ohm resistance.
For Constrained Supply Voltage Applications:
NC7SB3157P6X (onsemi) maintains compatibility with the full 1.65V to 5.5V supply range and is actively produced. The 15Ohm on-state resistance and identical switching characteristics to the original part make it suitable for designs where supply voltage flexibility is required, though the operating temperature range is limited to -40°C to 85°C.
Frequently Asked Questions (FAQ)
Q: Can FSA4157AP6X replace NLASB3157DFT2G directly?
A: FSA4157AP6X is functionally compatible but with trade-offs. It offers superior low-resistance performance (1.15Ohm vs. 7Ohm) and higher bandwidth (300MHz vs. 250MHz), making it suitable for low-insertion-loss applications. However, the minimum supply voltage increases from 1.65V to 2.7V, and the operating temperature range narrows to -40°C to 85°C. Verify your application's voltage and temperature requirements before substitution.
Q: What is the difference between SC-88, SC-70-6, and SOT-363 packages?
A: SC-88, SC-70-6, and SOT-363 are equivalent designations for the same 6-pin surface-mount package family. Manufacturers use different naming conventions, but the physical dimensions and pin configurations are identical. All substitute parts listed are mechanically compatible within this package family.
Q: Is SN74LVC1G3157DCKR a true equivalent to NLASB3157DFT2G?
A: Yes. SN74LVC1G3157DCKR matches the original part in on-state resistance (7Ohm), channel matching (150mOhm), switching times (5.2ns/4.6ns), charge injection (7pC), and operating temperature range (-55°C to 125°C). Both are ROHS3 compliant with MSL 1. The primary difference is the package designation (SC70-6 vs. SC-88), which are mechanically equivalent within the SOT-363 family.
Q: Why does PI5A4157CEX have "Last Time Buy" status?
A: Last Time Buy status indicates the manufacturer has announced end-of-life for this part. While currently available, inventory is finite and will not be replenished. This part is suitable for existing designs but not recommended for new production. Consider transitioning to actively produced alternatives such as 74LVC1G3157GW,125 or SN74LVC1G3157DCKR.
Q: Which substitute part is best for automotive applications?
A: Both 1P1G3157QDCKRQ1 (Texas Instruments) and 74LVC1G3157GW-Q10H (Nexperia USA Inc.) carry AEC-Q100 automotive qualification. The Texas Instruments part offers 15Ohm resistance with tighter channel matching (100mOhm), while the Nexperia part provides 10Ohm resistance. Selection depends on your specific insertion-loss and matching requirements.
Q: Can I use NC7SBU3157P6X as a substitute?
A: NC7SBU3157P6X is functionally compatible but classified as obsolete, similar to the original NLASB3157DFT2G. While 17,300 pieces are currently in stock, this part is not recommended for new designs due to end-of-life status. Prefer actively produced alternatives such as NC7SB3157P6X (the active variant) or other listed active-status parts.
Q: What are the key parameters that determine substitution compatibility?
A: Substitution compatibility is determined by: (1) Switch circuit type (SPDT), (2) Multiplexer configuration (2:1), (3) Package family (6-TSSOP/SC-88/SOT-363), (4) Supply voltage range compatibility (minimum 1.65V–5.5V or subset), (5) On-state resistance within application tolerance, (6) Operating temperature range (minimum -55°C to 125°C or subset), and (7) Compliance certifications (ROHS3, MSL 1). Verify all parameters against your specific application requirements before final selection.
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