ISL43L420IRZ Equivalent & Substitute Parts

Part Overview

The ISL43L420IRZ is a 4-circuit IC switch with SPDT configuration and 450Ohm on-state resistance, manufactured by Renesas Electronics Corporation in a 16-QFN (3x3) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device operates across a single supply voltage range of 1.1V to 4.5V and is suitable for signal routing and multiplexing applications requiring low on-state resistance and fast switching performance.

Key Parameters

Parameter	ISL43L420IRZ
Switch Circuit Type	SPDT
Multiplexer/Demultiplexer Circuit	2:1
Number of Circuits	4
On-State Resistance (Max)	450Ohm
Channel-to-Channel Matching (ΔRon)	50mOhm
Voltage - Supply, Single (V+)	1.1V ~ 4.5V
Switch Time (Ton, Toff) (Max)	13ns, 10ns
Charge Injection	-120pC
Channel Capacitance (CS(off), CD(off))	106pF
Current - Leakage (IS(off)) (Max)	50nA
Crosstalk	-98dB @ 100kHz
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	16-VFQFN Exposed Pad
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)

Substitute Part Grouping Explanation

Substitution eligibility for the ISL43L420IRZ is determined by the following critical parameters:

Primary Substitution Criteria:

Switch circuit topology (SPDT for direct replacement)
Number of circuits (4 circuits required)
On-state resistance compatibility (450Ohm nominal)
Channel-to-channel matching tolerance (ΔRon ≤ 50mOhm)
Supply voltage range overlap (minimum 1.1V to 4.5V coverage)
Operating temperature range (-40°C to 85°C)
Package compatibility (16-pin QFN 3x3 form factor)
RoHS3 compliance

Secondary Compatibility Factors:

Switch timing characteristics (Ton, Toff)
Charge injection specifications
Leakage current performance
Crosstalk performance

The substitute parts identified fall into two categories: direct SPDT 4-circuit replacements and functional equivalents with different circuit topologies that can serve the same application role through appropriate circuit design adaptation.

Parameter Comparison

Parameter	ISL43L420IRZ	MAX4701ETE+T	MAX4701ETE+	NLAS3899BMNTXG	TS3A44159RGTR
Manufacturer	Renesas Electronics	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim	onsemi	Texas Instruments
Switch Circuit Type	SPDT	DPDT	DPDT	DPDT	SPDT
Number of Circuits	4	2	2	2	4
On-State Resistance (Max)	450Ohm	75Ohm	75Ohm	2.5Ohm	450mOhm
Channel-to-Channel Matching (ΔRon)	50mOhm	2Ohm	2Ohm	700mOhm	50mOhm
Voltage - Supply, Single (V+)	1.1V ~ 4.5V	1.8V ~ 5.5V	1.8V ~ 5.5V	1.65V ~ 4.3V	1.65V ~ 4.3V
Switch Time Ton (Max)	13ns	35ns	35ns	40ns	23ns
Switch Time Toff (Max)	10ns	20ns	20ns	30ns	32ns
Charge Injection	-120pC	0.5pC	0.5pC	111pC	139pC
Channel Capacitance (CS(off), CD(off))	106pF	8pF	8pF	10pF	50pF
Current - Leakage (IS(off)) (Max)	50nA	500pA	500pA	300nA	20nA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	16-VFQFN Exposed Pad	16-WFQFN Exposed Pad	16-WFQFN Exposed Pad	16-VFQFN Exposed Pad	16-VFQFN Exposed Pad
Product Status	Obsolete	Active	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

TS3A44159RGTR is the primary substitute for the ISL43L420IRZ. Both devices share identical switch circuit topology (SPDT), circuit count (4), channel-to-channel matching specification (50mOhm), and package form factor (16-VFQFN Exposed Pad). The TS3A44159RGTR maintains active product status, ensuring long-term availability and supply chain stability. Operating temperature range, RoHS3 compliance, and ECCN classification are equivalent. The TS3A44159RGTR offers superior leakage current performance (20nA vs. 50nA) and improved moisture sensitivity rating (MSL 1 Unlimited vs. MSL 2 1 Year). Supply voltage range is slightly narrower (1.65V ~ 4.3V vs. 1.1V ~ 4.5V), requiring verification for applications operating below 1.65V.

MAX4701ETE+T and MAX4701ETE+ are functional alternatives with different circuit topology (DPDT 2-circuit configuration). These devices are suitable for applications where the DPDT topology can be adapted through circuit design. Both maintain active product status and offer superior on-state resistance (75Ohm), lower channel capacitance (8pF), and better leakage current performance (500pA). Supply voltage range extends to 5.5V. The reduced circuit count (2 vs. 4) requires dual-device implementation for equivalent functionality. Packaging differs (16-WFQFN vs. 16-VFQFN), necessitating PCB layout modification.

NLAS3899BMNTXG is an obsolete alternative with DPDT topology and exceptional on-state resistance (2.5Ohm). This device is not recommended for new designs due to obsolete status, despite superior electrical performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can the TS3A44159RGTR directly replace the ISL43L420IRZ without PCB modification?

A: Yes. Both devices use identical 16-VFQFN Exposed Pad packaging with matching pinout compatibility for SPDT 4-circuit configuration. No PCB layout changes are required. Verify supply voltage requirements; the TS3A44159RGTR operates from 1.65V minimum versus 1.1V for the ISL43L420IRZ.

Q: What are the key differences between the ISL43L420IRZ and TS3A44159RGTR?

A: Primary differences include on-state resistance specification (450Ohm vs. 450mOhm), switch timing (Ton 13ns vs. 23ns; Toff 10ns vs. 32ns), leakage current (50nA vs. 20nA), and supply voltage range (1.1V-4.5V vs. 1.65V-4.3V). The TS3A44159RGTR provides active product status and superior leakage performance.

Q: Can MAX4701ETE+T or MAX4701ETE+ be used as direct replacements?

A: No. These devices employ DPDT 2-circuit topology versus SPDT 4-circuit configuration. Direct pin-for-pin substitution is not possible. Circuit redesign is required to implement two MAX4701 devices to achieve equivalent 4-circuit SPDT functionality. Package form factor also differs (16-WFQFN vs. 16-VFQFN).

Q: Why is NLAS3899BMNTXG not recommended despite superior on-state resistance?

A: The NLAS3899BMNTXG is classified as obsolete, creating supply chain risk and limiting long-term availability. New designs should prioritize active product status devices. The TS3A44159RGTR provides adequate on-state resistance (450mOhm) with active product status.

Q: What is the impact of different moisture sensitivity levels?

A: The ISL43L420IRZ carries MSL 2 (1 Year) rating, requiring storage within controlled humidity conditions for one year. Substitute devices with MSL 1 (Unlimited) rating, including TS3A44159RGTR and MAX4701 variants, offer extended shelf life without moisture sensitivity constraints, reducing inventory management complexity.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The ISL43L420IRZ and all identified substitute parts (TS3A44159RGTR, MAX4701ETE+T, MAX4701ETE+, NLAS3899BMNTXG) maintain ROHS3 compliance status.

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