FSA4157P6 Equivalent & Substitute Parts

Part Overview

The FSA4157P6 is a single-circuit SPDT (Single Pole Double Throw) analog switch manufactured by onsemi, housed in a 6-pin SC-88 (SC-70-6) surface mount package. This component operates across a supply voltage range of 1.65V to 5.5V with a maximum on-state resistance of 1.15Ohm and supports switching frequencies up to 300MHz. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Key Parameters

Parameter	FSA4157P6 Value
Switch Circuit Configuration	SPDT
Multiplexer/Demultiplexer Circuit	2:1
Number of Circuits	1
On-State Resistance (Max)	1.15Ohm
Channel-to-Channel Matching (ΔRon)	60mOhm
Voltage - Supply, Single (V+)	1.65V ~ 5.5V
Switch Time (Ton, Toff) (Max)	35ns, 15ns
-3dB Bandwidth	300MHz
Charge Injection	20pC
Channel Capacitance (CS(off), CD(off))	12pF
Current - Leakage (IS(off)) (Max)	2nA (Typ)
Crosstalk	-70dB @ 1MHz
Operating Temperature	-40°C ~ 85°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 FSA4157P6 is determined by strict alignment across the following critical parameters:

Primary Substitution Criteria:

Switch circuit configuration: SPDT
Multiplexer/demultiplexer circuit: 2:1
Number of circuits: 1
Package / Case: 6-TSSOP, SC-88, SOT-363 (physical and electrical compatibility)
Supply voltage range: 1.65V ~ 5.5V (operational envelope)
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Secondary Compatibility Parameters:

On-state resistance tolerance (maximum 1.15Ohm or lower)
Channel-to-channel matching (ΔRon)
Operating temperature range (-40°C ~ 85°C minimum)
Crosstalk performance (-70dB @ 1MHz or better)

Parts are grouped as direct substitutes when all primary criteria and secondary parameters align within acceptable tolerances. Parts with higher on-state resistance or reduced bandwidth are classified as similar alternatives suitable for less demanding applications.

Parameter Comparison

Parameter	FSA4157P6	FSA4157P6X	TS5A3159ADCKT	TS5A3159DCKT	PI5A4157CEX	PI5A4157CEX-1516
Manufacturer	onsemi	onsemi	Texas Instruments	Texas Instruments	Diodes Incorporated	Diodes Incorporated
Product Status	Obsolete	Active	Last Time Buy	Last Time Buy	Last Time Buy	Active
Switch Circuit	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT
Multiplexer/Demultiplexer	2:1	2:1	2:1	2:1	2:1	2:1
On-State Resistance (Max)	1.15Ohm	1.15Ohm	900mOhm	1.1Ohm	1.2Ohm	1.2Ohm
Channel-to-Channel Matching (ΔRon)	60mOhm	60mOhm	50mOhm	100mOhm	10mOhm	10mOhm
Voltage - Supply, Single (V+)	1.65V ~ 5.5V	1.65V ~ 5.5V	1.65V ~ 5.5V	1.65V ~ 5.5V	1.65V ~ 5.5V	1.65V ~ 5.5V
Switch Time (Ton, Toff) (Max)	35ns, 15ns	35ns, 15ns	30ns, 20ns	35ns, 20ns	18ns, 20ns	18ns, 20ns
-3dB Bandwidth	300MHz	300MHz	100MHz	100MHz	150MHz	150MHz
Charge Injection	20pC	20pC	-20pC	36pC	35pC	35pC
Channel Capacitance (CS(off), CD(off))	12pF	12pF	18pF	23pF	4.6pF	4.6pF
Current - Leakage (IS(off)) (Max)	2nA (Typ)	2nA (Typ)	20nA	2nA	20nA	20nA
Crosstalk	-70dB @ 1MHz	-70dB @ 1MHz	-64dB @ 1MHz	-65dB @ 1MHz	-70dB @ 1MHz	-70dB @ 1MHz
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	6-TSSOP, SC-88, SOT-363	6-TSSOP, SC-88, SOT-363	6-TSSOP, SC-88, SOT-363	6-TSSOP, SC-88, SOT-363	6-TSSOP, SC-88, SOT-363	6-TSSOP, SC-88, SOT-363
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

FSA4157P6X (onsemi) is the primary direct substitute. It maintains identical electrical specifications to the FSA4157P6 while offering active product status and significantly higher inventory availability (96,312 units). Both parts share the same base product number (FSA4157) and are functionally interchangeable across all specified parameters.

PI5A4157CEX-1516 (Diodes Incorporated) provides an alternative direct substitute with active product status. It meets all primary substitution criteria with equivalent on-state resistance (1.2Ohm) and superior channel-to-channel matching (10mOhm vs. 60mOhm). The reduced bandwidth (150MHz vs. 300MHz) is acceptable for applications not requiring the full frequency response of the original part.

Secondary Alternatives (Conditional Compatibility):

TS5A3159DCKT (Texas Instruments) offers comparable performance with 1.1Ohm on-state resistance and maintains the full operating temperature range. However, it carries Last Time Buy status and exhibits reduced bandwidth (100MHz). This part is suitable for applications where bandwidth requirements do not exceed 100MHz.

TS5A3159ADCKT (Texas Instruments) provides lower on-state resistance (900mOhm) but operates at reduced bandwidth (100MHz) and carries Last Time Buy status. Selection of this part should be limited to applications where the lower resistance provides measurable system benefit.

PI5A4157CEX (Diodes Incorporated) meets all primary criteria with superior channel-to-channel matching (10mOhm) but carries Last Time Buy status. Inventory availability is substantial (149,400 units), supporting near-term production requirements.

Parts Not Recommended:

NLVASB3157DFT2G (onsemi) exhibits significantly higher on-state resistance (7Ohm typical) and reduced bandwidth (250MHz), making it unsuitable for applications requiring the electrical performance of the FSA4157P6. This part is classified as obsolete.

PI5A3157CEX (Diodes Incorporated) shows substantially higher on-state resistance (13Ohm) and is classified as active but does not meet the electrical performance envelope of the original part.

Frequently Asked Questions (FAQ)

Q: Can FSA4157P6X be used as a direct replacement for FSA4157P6?

A: Yes. FSA4157P6X is a direct substitute with identical electrical specifications. The primary difference is product status: FSA4157P6X is active with higher inventory availability, while FSA4157P6 is obsolete. Both parts are manufactured by onsemi and share the same base product number.

Q: What is the difference between PI5A4157CEX and PI5A4157CEX-1516?

A: Both parts are manufactured by Diodes Incorporated with identical electrical specifications (1.2Ohm on-state resistance, 150MHz bandwidth). PI5A4157CEX-1516 is active, while PI5A4157CEX carries Last Time Buy status. For new designs, PI5A4157CEX-1516 is preferred due to its active product status.

Q: Are Texas Instruments TS5A3159 parts suitable replacements?

A: TS5A3159DCKT and TS5A3159ADCKT meet the primary substitution criteria (SPDT, 2:1, package compatibility, supply voltage range). However, both carry Last Time Buy status and operate at reduced bandwidth (100MHz vs. 300MHz). Selection depends on application bandwidth requirements. TS5A3159DCKT offers closer on-state resistance matching (1.1Ohm vs. 1.15Ohm).

Q: What packaging options are available for substitutes?

A: All substitute parts are housed in 6-TSSOP, SC-88, or SOT-363 packages, maintaining physical and electrical compatibility with the FSA4157P6. Specific packaging variants (Cut Tape, Digi-Reel, Tape & Reel) vary by manufacturer and part number but do not affect electrical performance.

Q: Which substitute offers the best on-state resistance performance?

A: TS5A3159ADCKT provides the lowest on-state resistance at 900mOhm. However, this part carries Last Time Buy status and reduced bandwidth (100MHz). For active products, PI5A4157CEX and PI5A4157CEX-1516 offer superior channel-to-channel matching (10mOhm) compared to the original FSA4157P6 (60mOhm).

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), matching the environmental and regulatory status of the FSA4157P6.

Q: What is the inventory status of available substitutes?

A: FSA4157P6X (onsemi) offers the highest current availability at 96,312 units. PI5A4157CEX (Diodes Incorporated) provides 149,400 units but carries Last Time Buy status. PI5A4157CEX-1516 (Diodes Incorporated) is active with 9,301 units available. Texas Instruments alternatives show lower inventory levels (1,772 and 6,800 units respectively).

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