ISL5123CB-T Equivalent & Substitute Parts

Part Overview

The ISL5123CB-T is a single-circuit SPDT (Single Pole Double Throw) analog switch manufactured by Renesas Electronics Corporation, configured as a 2:1 multiplexer/demultiplexer with 20Ohm on-state resistance in an 8-SOIC surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across a 2.7V to 12V single supply voltage range with switching times of 35ns (turn-on) and 30ns (turn-off).

Key Parameters

Parameter	ISL5123CB-T
Manufacturer	Renesas Electronics Corporation
Switch Circuit Configuration	SPDT
Multiplexer/Demultiplexer Circuit	2:1
Number of Circuits	1
On-State Resistance (Max)	20Ohm
Channel-to-Channel Matching (ΔRon)	800mOhm
Voltage - Supply, Single (V+)	2.7V ~ 12V
Switch Time (Ton, Toff) (Max)	35ns, 30ns
Charge Injection	5pC
Channel Capacitance (CS(off), CD(off))	8pF, 8pF
Current - Leakage (IS(off)) (Max)	100pA
Crosstalk	-105dB @ 1MHz
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the ISL5123CB-T is determined by the following critical parameters that must remain compatible:

Mandatory Compatibility Parameters:

Switch Circuit: SPDT (Single Pole Double Throw)
Multiplexer/Demultiplexer Circuit: 2:1 configuration
Number of Circuits: 1
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Voltage - Supply, Single (V+): 2.7V ~ 12V range
Channel-to-Channel Matching (ΔRon): 800mOhm
Mounting Type: Surface Mount

Allowable Parameter Variations:

On-State Resistance (Max): The ISL5123CB-T specifies 20Ohm maximum. Substitute parts with higher on-state resistance (60Ohm) are functionally compatible where circuit impedance requirements permit.
Switch Time: Substitute parts with longer switching times (100ns turn-on, 75ns turn-off) are compatible in applications not requiring the original 35ns/30ns performance.
Charge Injection: Substitute parts with lower charge injection (1pC vs. 5pC) provide improved performance.
Crosstalk: Substitute parts with higher crosstalk (-90dB vs. -105dB) remain compatible for most applications.
Operating Temperature: Substitute parts with narrower temperature ranges (0°C ~ 70°C) are compatible only in applications within this range.

The MAX4544 series (Analog Devices Inc./Maxim Integrated) meets all mandatory compatibility parameters and is available in multiple packaging configurations.

Parameter Comparison

Parameter	ISL5123CB-T	MAX4544CSA+	MAX4544CSA+T	MAX4544ESA+	MAX4544ESA+T
Manufacturer	Renesas Electronics	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Switch Circuit	SPDT	SPDT	SPDT	SPDT	SPDT
Multiplexer/Demultiplexer Circuit	2:1	2:1	2:1	2:1	2:1
Number of Circuits	1	1	1	1	1
On-State Resistance (Max)	20Ohm	60Ohm	60Ohm	60Ohm	60Ohm
Channel-to-Channel Matching (ΔRon)	800mOhm	800mOhm	800mOhm	800mOhm	800mOhm
Voltage - Supply, Single (V+)	2.7V ~ 12V	2.7V ~ 12V	2.7V ~ 12V	2.7V ~ 12V	2.7V ~ 12V
Switch Time (Ton, Toff) (Max)	35ns, 30ns	100ns, 75ns	100ns, 75ns	100ns, 75ns	100ns, 75ns
Charge Injection	5pC	1pC	1pC	1pC	1pC
Channel Capacitance (CS(off), CD(off))	8pF, 8pF	8pF, 8pF	8pF, 8pF	8pF, 8pF	8pF, 8pF
Current - Leakage (IS(off)) (Max)	100pA	100pA	100pA	100pA	100pA
Crosstalk	-105dB @ 1MHz	-90dB @ 1MHz	-90dB @ 1MHz	-90dB @ 1MHz	-90dB @ 1MHz
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Packaging Type	Not specified	Tube	Tape & Reel (TR)	Tube	Cut Tape (CT) & Digi-Reel®
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Product Status Consideration: The ISL5123CB-T is obsolete, making the MAX4544 series the appropriate substitute. All MAX4544 variants (MAX4544CSA+, MAX4544CSA+T, MAX4544ESA+, MAX4544ESA+T) are active products with current manufacturing support and availability.

Compliance and Certification: The ISL5123CB-T is RoHS non-compliant. All MAX4544 substitute parts are ROHS3 compliant, meeting current regulatory requirements for new designs and production. Both the original part and all substitutes are REACH Unaffected and classified as EAR99 for export control purposes.

Temperature Range Selection:

For applications requiring -40°C to 85°C operating temperature: Select MAX4544ESA+ or MAX4544ESA+T
For applications limited to 0°C to 70°C operating temperature: MAX4544CSA+ or MAX4544CSA+T are suitable

Packaging Configuration Selection:

Tube packaging (MAX4544CSA+, MAX4544ESA+): Standard for lower-volume applications
Tape & Reel (MAX4544CSA+T): Automated assembly processes
Cut Tape & Digi-Reel® (MAX4544ESA+T): Highest inventory availability (15,600 pcs) with flexible handling options

On-State Resistance Impact: The MAX4544 series specifies 60Ohm maximum on-state resistance compared to the ISL5123CB-T's 20Ohm. Circuit designs must accommodate this 3x increase in on-state resistance. Applications with strict impedance matching or low-impedance signal paths require circuit redesign validation.

Frequently Asked Questions (FAQ)

Q: Can MAX4544 parts directly replace ISL5123CB-T without circuit modifications?

A: Direct pin-compatible replacement is possible due to identical 8-SOIC packaging and SPDT 2:1 configuration. However, the 60Ohm on-state resistance of MAX4544 versus 20Ohm of ISL5123CB-T requires circuit analysis. Applications sensitive to on-state resistance, such as low-impedance signal switching or precision analog multiplexing, may require impedance compensation or circuit redesign.

Q: Which MAX4544 variant should be selected for new production?

A: MAX4544ESA+T is recommended for new production due to highest inventory availability (15,600 pcs), active product status, ROHS3 compliance, extended operating temperature range (-40°C to 85°C), and Cut Tape & Digi-Reel® packaging suitable for automated assembly.

Q: Are there temperature range limitations with MAX4544CSA+ variants?

A: MAX4544CSA+ and MAX4544CSA+T are rated for 0°C to 70°C operating temperature, which is narrower than the ISL5123CB-T's -40°C to 85°C range. These variants are unsuitable for applications requiring extended low-temperature or high-temperature operation. MAX4544ESA+ and MAX4544ESA+T maintain the full -40°C to 85°C range.

Q: What is the impact of different crosstalk specifications?

A: ISL5123CB-T specifies -105dB crosstalk at 1MHz, while MAX4544 variants specify -90dB. This 15dB difference represents approximately 5.6x higher crosstalk in the MAX4544 series. Applications with stringent crosstalk requirements, such as precision audio or RF signal switching, require performance validation.

Q: How do charge injection differences affect circuit performance?

A: ISL5123CB-T has 5pC charge injection versus 1pC for MAX4544 variants. Lower charge injection in MAX4544 reduces signal distortion during switching transitions, providing improved performance in precision analog applications. This represents an improvement over the original part.

Q: What packaging options are available for different assembly methods?

A: Tube packaging (MAX4544CSA+, MAX4544ESA+) is suitable for manual or semi-automated assembly. Tape & Reel (MAX4544CSA+T) and Cut Tape & Digi-Reel® (MAX4544ESA+T) are designed for fully automated pick-and-place assembly. Selection depends on production volume and assembly equipment capabilities.

Q: Are all MAX4544 variants electrically identical except for packaging?

A: MAX4544CSA+/CSA+T and MAX4544ESA+/ESA+T differ in operating temperature range. CSA variants operate 0°C to 70°C; ESA variants operate -40°C to 85°C. All other electrical parameters are identical. Packaging differences (Tube, Tape & Reel, Cut Tape & Digi-Reel®) do not affect electrical performance.

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