ISL5123IBZ Equivalent & Substitute Parts

Part Overview

The ISL5123IBZ is a single-circuit SPDT (Single Pole Double Throw) analog switch manufactured by Renesas Electronics Corporation, configured as a 2:1 multiplexer/demultiplexer in an 8-SOIC surface mount package. This device features a 20Ohm on-state resistance and operates across a 2.7V to 12V single supply voltage range with a maximum switch time of 35ns (Ton) and 30ns (Toff).

The ISL5123IBZ is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production requirements for applications utilizing this interface switch.

Key Parameters

Parameter	ISL5123IBZ Value
Switch Circuit Configuration	SPDT
Multiplexer/Demultiplexer Circuit	2:1
Number of Circuits	1
On-State Resistance (Max)	20Ohm
Channel-to-Channel Matching (ΔRon)	800mOhm
Supply Voltage Range (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 Range	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the ISL5123IBZ are identified based on the following critical parameters that determine functional compatibility:

Mandatory Matching Parameters:

Switch Circuit: SPDT
Multiplexer/Demultiplexer Circuit: 2:1
Number of Circuits: 1
Supply Voltage Range: 2.7V ~ 12V (minimum requirement)
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount

Allowable Parameter Variations:

On-State Resistance (Max): Substitute parts may have higher resistance values (60Ohm) provided the application circuit design accommodates the increased resistance
Switch Time: Substitute parts may have longer switching times (100ns Ton, 75ns Toff) if application timing requirements permit
Charge Injection: Substitute parts may have lower charge injection values (1pC vs. 5pC)
Crosstalk: Substitute parts may have different crosstalk specifications (-90dB @ 1MHz vs. -105dB @ 1MHz)
Operating Temperature Range: Substitute parts must support the application's required temperature range

The MAX4544 series (Analog Devices Inc./Maxim Integrated) meets all mandatory matching parameters and is available in multiple packaging configurations (Tube, Tape & Reel, Cut Tape & Digi-Reel).

Parameter Comparison

Parameter	ISL5123IBZ	MAX4544CSA+	MAX4544CSA+T	MAX4544ESA+	MAX4544ESA+T
Manufacturer	Renesas Electronics	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim
Product Status	Obsolete	Active	Active	Active	Active
Switch Circuit	SPDT	SPDT	SPDT	SPDT	SPDT
Multiplexer/Demultiplexer	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
Supply Voltage Range (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 Range	-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
Packaging Type	Not specified	Tube	Tape & Reel (TR)	Tube	Cut Tape (CT) & Digi-Reel®
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

All four MAX4544 variants are active products from Analog Devices Inc./Maxim Integrated and maintain ROHS3 compliance and MSL 1 rating, ensuring regulatory and environmental compatibility with the obsolete ISL5123IBZ.

Temperature Range Considerations:

MAX4544CSA+ and MAX4544CSA+T operate within 0°C ~ 70°C. These variants are suitable for applications with operating temperature requirements within this range.
MAX4544ESA+ and MAX4544ESA+T operate within -40°C ~ 85°C, matching the ISL5123IBZ temperature range. These variants are recommended for applications requiring extended temperature operation.

Packaging Selection:

MAX4544CSA+ and MAX4544ESA+: Tube packaging
MAX4544CSA+T and MAX4544ESA+T: Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® packaging respectively

Packaging selection depends on production volume and assembly process requirements. Tape & Reel and Cut Tape formats support automated assembly operations, while Tube packaging is suitable for lower-volume or manual assembly processes.

On-State Resistance Impact: The MAX4544 series exhibits 60Ohm on-state resistance compared to the ISL5123IBZ's 20Ohm specification. Circuit designs must accommodate this 3x increase in resistance. Applications with low-impedance signal paths or stringent signal integrity requirements should evaluate the impact on signal attenuation and bandwidth.

Frequently Asked Questions (FAQ)

Q: Can MAX4544 variants directly replace ISL5123IBZ without circuit modifications?

A: Direct replacement is possible if the application circuit design accommodates the 60Ohm on-state resistance of the MAX4544 series versus the 20Ohm specification of the ISL5123IBZ. Signal path impedance and bandwidth requirements must be evaluated. The MAX4544 series maintains identical supply voltage range (2.7V ~ 12V), package configuration (8-SOIC), and pin functionality, enabling mechanical and electrical compatibility at the component level.

Q: Which MAX4544 variant should be selected for applications requiring -40°C to 85°C operation?

A: MAX4544ESA+ (Tube packaging) or MAX4544ESA+T (Cut Tape & Digi-Reel packaging) are required for applications with operating temperature requirements spanning -40°C to 85°C. The MAX4544CSA+ and MAX4544CSA+T variants are limited to 0°C ~ 70°C operation and are not suitable for extended temperature applications.

Q: What is the difference between MAX4544ESA+ and MAX4544ESA+T?

A: Both variants are electrically identical with -40°C ~ 85°C operating temperature range. The difference is packaging format: MAX4544ESA+ is supplied in Tube packaging, while MAX4544ESA+T is supplied in Cut Tape (CT) & Digi-Reel® format. Tube packaging is typically used for manual assembly or lower-volume production, while Cut Tape & Digi-Reel format supports automated pick-and-place assembly operations.

Q: Are there performance differences between ISL5123IBZ and MAX4544 series beyond on-state resistance?

A: Yes. The MAX4544 series exhibits longer switch times (100ns Ton, 75ns Toff versus 35ns Ton, 30ns Toff for ISL5123IBZ) and lower charge injection (1pC versus 5pC). Crosstalk specification differs (-90dB @ 1MHz for MAX4544 versus -105dB @ 1MHz for ISL5123IBZ). Applications with timing-critical signal switching or high-frequency operation should evaluate these parameter differences against circuit requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All MAX4544 variants (CSA+, CSA+T, ESA+, ESA+T) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the ISL5123IBZ.

Q: What inventory availability exists for MAX4544 substitutes?

A: MAX4544CSA+ and MAX4544ESA+ (Tube): 2,100 pieces each. MAX4544CSA+T (Tape & Reel): 3,225 pieces. MAX4544ESA+T (Cut Tape & Digi-Reel): 15,600 pieces. Inventory levels support both prototype development and production-volume requirements.

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