ISL43142IR Equivalent & Substitute Parts

Part Overview

The ISL43142IR is a 4-circuit IC switch manufactured by Renesas Electronics Corporation, featuring SPST NO/NC configuration with 65Ohm on-state resistance in a 16-QFN (3x3) surface mount package. This device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The part operates across single supply (2.7V to 12V) and dual supply (±2.6V to 6V) configurations, with switching times of 80ns (Ton) and 30ns (Toff).

Key Parameters

Parameter	ISL43142IR Value
Switch Circuit Configuration	SPST - NO/NC
Number of Circuits	4
Multiplexer/Demultiplexer Circuit	1:1
On-State Resistance (Max)	65Ohm
Channel-to-Channel Matching (ΔRon)	2Ohm
Voltage - Supply, Single (V+)	2.7V ~ 12V
Voltage - Supply, Dual (V±)	±2.6V ~ 6V
Switch Time Ton (Max)	80ns
Switch Time Toff (Max)	30ns
Charge Injection	1pC
Operating Temperature Range	-40°C ~ 85°C
Package / Case	16-VFQFN Exposed Pad
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the ISL43142IR is determined by the following core electrical and mechanical parameters:

Circuit Configuration: Must maintain SPST NO/NC topology with 4 independent circuits in 1:1 multiplexer configuration
On-State Resistance: The ISL43142IR specifies 65Ohm maximum. Substitute parts with lower on-state resistance (5.1Ohm) are electrically compatible and provide improved performance characteristics
Supply Voltage Compatibility: Substitute parts must support overlapping or extended supply voltage ranges to ensure operation in existing designs
Package Compatibility: Surface mount packages with equivalent or compatible pinouts and thermal characteristics
Switching Performance: Ton and Toff parameters must be suitable for the application's timing requirements
Temperature Range: Operating temperature must encompass or exceed the original specification

The ADG4613BCPZ-REEL7 from Analog Devices Inc. meets these substitution criteria with identical circuit configuration, superior on-state resistance performance, and active product status with modern compliance certifications.

Parameter Comparison

Parameter	ISL43142IR	ADG4613BCPZ-REEL7	Compatibility Notes
Manufacturer	Renesas Electronics	Analog Devices Inc.	Different manufacturer, same functional class
Switch Circuit	SPST - NO/NC	SPST - NO/NC	Identical configuration
Number of Circuits	4	4	Identical
Multiplexer Configuration	1:1	1:1	Identical
On-State Resistance (Max)	65Ohm	5.1Ohm	Substitute has lower resistance; improved performance
Channel-to-Channel Matching (ΔRon)	2Ohm	50mOhm	Substitute has tighter matching tolerance
Voltage - Supply, Single (V+)	2.7V ~ 12V	3V ~ 12V	Overlapping range; substitute minimum is 0.3V higher
Voltage - Supply, Dual (V±)	±2.6V ~ 6V	±3V ~ 5.5V	Overlapping range; substitute has narrower dual supply window
Switch Time Ton (Max)	80ns	73ns	Substitute is faster
Switch Time Toff (Max)	30ns	91ns	Substitute is slower; verify timing requirements
Charge Injection	1pC	292pC	Substitute has significantly higher charge injection
Operating Temperature	-40°C ~ 85°C	-40°C ~ 105°C	Substitute has extended upper temperature limit
Package / Case	16-VFQFN Exposed Pad	16-WFQFN Exposed Pad, CSP	Similar QFN footprint; verify PCB layout compatibility
Product Status	Obsolete	Active	Substitute is in active production
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Substitute meets modern environmental standards
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)	Substitute requires controlled storage conditions

Engineering Selection Recommendations

Primary Substitute: ADG4613BCPZ-REEL7

The ADG4613BCPZ-REEL7 is the recommended substitute based on the following engineering criteria:

Functional Equivalence: Maintains identical SPST NO/NC 4-circuit 1:1 configuration with compatible pinout and package class
Active Product Status: Currently in active production, ensuring long-term availability and supply chain stability
Compliance Advantage: ROHS3 compliant versus RoHS non-compliant original, meeting modern regulatory requirements for new designs and production runs
Performance Enhancement: Superior on-state resistance (5.1Ohm vs. 65Ohm) and tighter channel matching (50mOhm vs. 2Ohm) provide improved signal integrity and reduced power dissipation
Extended Temperature Range: Operating range of -40°C to 105°C exceeds the original -40°C to 85°C specification
Supply Voltage Overlap: Single supply range (3V to 12V) and dual supply range (±3V to 5.5V) provide adequate coverage for most applications using the ISL43142IR

Design Considerations for Substitution:

Verify PCB layout compatibility between 16-VFQFN and 16-WFQFN packages; footprints are similar but require confirmation
Confirm application timing requirements accommodate Toff of 91ns (versus 30ns original); Ton improvement to 73ns is beneficial
Evaluate charge injection impact (292pC versus 1pC); applications sensitive to charge injection require circuit-level analysis
Confirm minimum supply voltage requirement; ADG4613BCPZ-REEL7 minimum single supply is 3V (versus 2.7V original)
Implement controlled storage procedures for MSL 3 rating (168-hour dry storage requirement)

Frequently Asked Questions (FAQ)

Q: Can the ADG4613BCPZ-REEL7 directly replace the ISL43142IR without PCB modifications?

A: The devices share identical circuit configuration and similar QFN package classes. However, the 16-VFQFN (original) and 16-WFQFN (substitute) packages have slightly different dimensions. Verify PCB footprint compatibility and thermal pad dimensions before committing to layout changes. Pin assignments are functionally equivalent.

Q: What is the impact of the 65Ohm versus 5.1Ohm on-state resistance difference?

A: The lower on-state resistance of the ADG4613BCPZ-REEL7 reduces power dissipation and improves signal fidelity in analog switching applications. For digital switching applications, this difference is typically negligible. Applications with tight impedance matching requirements benefit from the lower resistance.

Q: Are there supply voltage compatibility issues when substituting?

A: The ADG4613BCPZ-REEL7 single supply minimum is 3V, compared to 2.7V for the ISL43142IR. If your design operates below 3V single supply, this substitute is not suitable. Dual supply ranges overlap adequately (±3V to ±5.5V for substitute versus ±2.6V to ±6V original).

Q: How does the higher charge injection (292pC vs. 1pC) affect circuit performance?

A: Charge injection becomes significant in precision analog applications, particularly in sample-and-hold circuits or high-impedance signal paths. For standard digital switching or audio-frequency analog switching, the difference is typically acceptable. Evaluate application-specific requirements through circuit simulation or prototype testing.

Q: What are the storage and handling requirements for the ADG4613BCPZ-REEL7?

A: The MSL 3 rating requires storage at ≤30°C and ≤85% relative humidity, with a 168-hour dry storage window after package opening. The original ISL43142IR (MSL 1) has unlimited shelf life. Implement appropriate moisture control procedures during component storage and assembly.

Q: Is the extended operating temperature range (-40°C to 105°C) beneficial for my application?

A: The substitute's upper temperature limit of 105°C (versus 85°C original) provides additional thermal margin for high-temperature environments. This is advantageous for automotive, industrial, or high-reliability applications. Standard commercial applications typically do not require this extended range.

Q: What is the significance of RoHS3 compliance for the substitute?

A: RoHS3 compliance indicates the substitute meets current environmental and hazardous substance restrictions, making it suitable for new product designs and markets with regulatory requirements. The original RoHS non-compliant part may face restrictions in certain regions or procurement scenarios.

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