ISL43L840IVZ Equivalent & Substitute Parts

Part Overview

The ISL43L840IVZ is a 2-circuit SP4T analog switch manufactured by Renesas Electronics Corporation, designed for low-voltage signal routing applications. This device features a 750mOhm on-state resistance and operates across a 1.6V to 3.6V supply range in a 16-TSSOP surface mount package.

The ISL43L840IVZ is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this interface component.

Key Parameters

Parameter	Value
Switch Circuit Configuration	SP4T (Single Pole, 4-Throw)
Number of Circuits	2
Multiplexer/Demultiplexer Circuit	4:1
On-State Resistance (Max)	750mOhm
Channel-to-Channel Matching (ΔRon)	120mOhm
Voltage - Supply, Single (V+)	1.6V ~ 3.6V
Operating Temperature Range	-40°C ~ 85°C (TA)
Package / Case	16-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the ISL43L840IVZ is determined by the following critical parameters:

Switch circuit topology: SP4T configuration with 2 circuits and 4:1 multiplexer/demultiplexer functionality
Supply voltage compatibility: Single supply operation within 1.6V to 3.6V range
Package compatibility: 16-TSSOP surface mount form factor with identical 0.173" (4.40mm) width
Operating temperature range: -40°C to 85°C
On-state resistance: Maximum 750mOhm (allows for lower resistance alternatives)
Regulatory compliance: ROHS3 compliance and REACH unaffected status

The MAX4782EUE+ meets all substitution criteria through identical switch topology, supply voltage range, package specification, temperature range, and regulatory compliance status.

Parameter Comparison

Parameter	ISL43L840IVZ	MAX4782EUE+	Compatibility
Manufacturer	Renesas Electronics Corporation	Analog Devices Inc./Maxim Integrated	Different manufacturer
Product Status	Obsolete	Active	Substitute is actively produced
Switch Circuit	SP4T	SP4T	Identical
Number of Circuits	2	2	Identical
Multiplexer/Demultiplexer Circuit	4:1	4:1	Identical
On-State Resistance (Max)	750mOhm	1Ohm	Substitute has higher resistance
Channel-to-Channel Matching (ΔRon)	120mOhm	300mOhm	Substitute has wider matching tolerance
Voltage - Supply, Single (V+)	1.6V ~ 3.6V	1.6V ~ 3.6V	Identical
Charge Injection	-96pC	-110pC	Substitute has higher charge injection magnitude
Channel Capacitance (CS(off), CD(off))	62pF	38pF, 158pF	Substitute has lower source capacitance, higher drain capacitance
Current - Leakage (IS(off)) (Max)	4nA	2nA	Substitute has lower leakage current
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	Identical
Package / Case	16-TSSOP (0.173", 4.40mm Width)	16-TSSOP (0.173", 4.40mm Width)	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Identical
REACH Status	REACH Unaffected	REACH Unaffected	Identical

Engineering Selection Recommendations

The MAX4782EUE+ is a direct functional substitute for the obsolete ISL43L840IVZ based on the following factors:

Identical switch topology (SP4T, 2 circuits, 4:1 configuration)
Matching supply voltage range (1.6V to 3.6V)
Identical package specification (16-TSSOP surface mount)
Matching operating temperature range (-40°C to 85°C)
Equivalent regulatory compliance (ROHS3 compliant, REACH unaffected)
Active product status ensures ongoing availability and supply chain support

The MAX4782EUE+ exhibits higher on-state resistance (1Ohm versus 750mOhm) and wider channel-to-channel matching tolerance (300mOhm versus 120mOhm). These parameter differences must be evaluated against specific application requirements for signal attenuation, impedance matching, and crosstalk performance. The substitute demonstrates superior leakage current performance (2nA versus 4nA) and lower source capacitance (38pF versus 62pF), which may provide benefits in low-power and high-frequency applications.

Frequently Asked Questions (FAQ)

Q: Can the MAX4782EUE+ be used as a direct pin-for-pin replacement for the ISL43L840IVZ?

A: Yes. Both devices use the 16-TSSOP package with identical pinout configuration, enabling direct PCB substitution without layout modifications.

Q: What are the key electrical differences between these parts?

A: The MAX4782EUE+ has higher on-state resistance (1Ohm versus 750mOhm) and wider channel-to-channel matching tolerance (300mOhm versus 120mOhm). The substitute offers lower leakage current (2nA versus 4nA) and lower source capacitance (38pF versus 62pF). Applications sensitive to signal attenuation or impedance matching must account for the resistance increase.

Q: Are both parts compliant with the same regulatory standards?

A: Yes. Both the ISL43L840IVZ and MAX4782EUE+ are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity levels (MSL 1, Unlimited).

Q: What is the supply voltage compatibility between these parts?

A: Both devices operate across an identical single supply voltage range of 1.6V to 3.6V, ensuring full compatibility in existing power supply designs.

Q: Why is the ISL43L840IVZ classified as obsolete?

A: The ISL43L840IVZ has reached end-of-life status. The MAX4782EUE+ is an active product from Analog Devices Inc./Maxim Integrated, ensuring continued availability and manufacturing support.

Q: Are there any temperature range limitations when substituting?

A: No. Both devices operate across the identical temperature range of -40°C to 85°C, providing full compatibility for thermal specifications.

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