ISL5123CBZ Equivalent & Substitute Parts

Part Overview

The ISL5123CBZ is a single-circuit SPDT (Single Pole Double Throw) analog switch manufactured by Renesas Electronics Corporation, designed for 2:1 multiplexing applications in 8-SOIC surface mount packaging. This component features a 20Ohm on-state resistance and operates across a 2.7V to 12V single supply voltage range with switching times of 35ns (Ton) and 30ns (Toff).

The ISL5123CBZ is classified as obsolete. Equivalent substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and system upgrades.

Key Parameters

Parameter	ISL5123CBZ
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 (Max)	35ns
Switch Time Toff (Max)	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
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the ISL5123CBZ must satisfy the following mandatory criteria:

Electrical Compatibility Requirements:

Switch circuit configuration: SPDT
Multiplexer/Demultiplexer circuit: 2:1
Number of circuits: 1
Voltage supply range: Must encompass or match 2.7V ~ 12V
Package type: 8-SOIC surface mount

Mechanical Compatibility Requirements:

Package dimensions: 8-SOIC (0.154", 3.90mm Width)
Mounting type: Surface Mount

The MAX4544 series (Analog Devices Inc./Maxim Integrated) satisfies all mandatory electrical and mechanical compatibility criteria. All four variants—MAX4544CSA+, MAX4544CSA+T, MAX4544ESA+, and MAX4544ESA+T—share identical core functionality and package specifications. Differences exist only in packaging format (Tube, Tape & Reel, or Cut Tape & Digi-Reel) and operating temperature range variants.

Parameter Comparison

Parameter	ISL5123CBZ	MAX4544CSA+	MAX4544CSA+T	MAX4544ESA+	MAX4544ESA+T
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 (Max)	35ns	100ns	100ns	100ns	100ns
Switch Time Toff (Max)	30ns	75ns	75ns	75ns	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	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Product Status Consideration: The ISL5123CBZ is obsolete, while all MAX4544 variants are active products with confirmed inventory availability. MAX4544ESA+ and MAX4544ESA+T maintain the extended operating temperature range (-40°C ~ 85°C) matching the original ISL5123CBZ specification, making them the preferred substitutes for applications requiring full temperature range coverage.

Compliance and Certification: All substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), REACH Unaffected status, and identical ECCN and HTSUS classifications as the original component, ensuring regulatory continuity.

Packaging Format Selection:

MAX4544CSA+ and MAX4544ESA+: Tube packaging
MAX4544CSA+T and MAX4544ESA+T: Tape & Reel or Cut Tape & Digi-Reel packaging

Selection depends on production volume and assembly line requirements.

Temperature Range Matching: For applications operating across the full -40°C ~ 85°C range, select MAX4544ESA+ or MAX4544ESA+T. For applications limited to 0°C ~ 70°C, MAX4544CSA+ or MAX4544CSA+T are suitable alternatives.

Frequently Asked Questions (FAQ)

Q: Can MAX4544 variants directly replace ISL5123CBZ in existing designs?

A: Yes, all MAX4544 variants are pin-compatible and functionally equivalent within the specified electrical and mechanical parameters. The 8-SOIC package dimensions are identical, and supply voltage ranges overlap completely. No PCB redesign is required.

Q: What is the primary electrical difference between ISL5123CBZ and MAX4544 series?

A: The on-state resistance differs: ISL5123CBZ specifies 20Ohm maximum, while MAX4544 variants specify 60Ohm maximum. This affects signal attenuation and power dissipation in switching applications. Circuit design must account for this parameter difference.

Q: Which MAX4544 variant should be selected for extended temperature applications?

A: MAX4544ESA+ or MAX4544ESA+T are specified for -40°C ~ 85°C operation, matching the ISL5123CBZ temperature range. MAX4544CSA+ and MAX4544CSA+T are limited to 0°C ~ 70°C and are unsuitable for extended temperature requirements.

Q: Are there packaging format differences between MAX4544 variants?

A: Yes. MAX4544CSA+ and MAX4544ESA+ are supplied in Tube format. MAX4544CSA+T and MAX4544ESA+T are supplied in Tape & Reel (TR) or Cut Tape & Digi-Reel format. Selection depends on production volume and assembly equipment compatibility.

Q: Do all substitute parts maintain the same regulatory compliance as ISL5123CBZ?

A: Yes. All MAX4544 variants are ROHS3 compliant, MSL Level 1, REACH Unaffected, and share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications.

Q: What performance parameters differ between ISL5123CBZ and MAX4544 series?

A: Switch timing (Ton/Toff), charge injection, and crosstalk specifications differ. ISL5123CBZ provides faster switching (35ns/30ns vs. 100ns/75ns) and superior crosstalk performance (-105dB vs. -90dB @ 1MHz). MAX4544 offers lower charge injection (1pC vs. 5pC). Application requirements determine whether these differences are acceptable.

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