ISL43L121IRZ Equivalent & Substitute Parts

Part Overview

The ISL43L121IRZ is a 2-circuit IC switch manufactured by Renesas Electronics Corporation, configured as SPST-NC (Single Pole Single Throw - Normally Closed) with 1:1 multiplexer/demultiplexer functionality. This component features 250mOhm on-state resistance and operates across a 1.65V to 3.6V single supply voltage range in an 8-TDFN (3x3) surface mount package.

The ISL43L121IRZ is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this component.

Key Parameters

Parameter	ISL43L121IRZ
Switch Circuit Type	SPST - NC
Multiplexer/Demultiplexer Circuit	1:1
Number of Circuits	2
On-State Resistance (Max)	250mOhm
Channel-to-Channel Matching (ΔRon)	5mOhm
Voltage - Supply, Single (V+)	1.65V ~ 3.6V
Switch Time (Ton, Toff) (Max)	25ns, 25ns
Charge Injection	-125pC
Channel Capacitance (CS(off), CD(off))	182pF, 182pF
Current - Leakage (IS(off)) (Max)	3nA
Crosstalk	-94dB @ 100kHz
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-WDFN Exposed Pad
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the ISL43L121IRZ requires evaluation based on the following critical parameters:

Switch Circuit Configuration: The main part operates as SPST-NC (2 circuits, 1:1). Substitute parts must support equivalent switching topology or provide compatible circuit count and multiplexing ratio.
On-State Resistance: Maximum 250mOhm establishes the baseline for signal path impedance. Substitutes with higher on-state resistance may introduce signal degradation in low-impedance applications.
Supply Voltage Range: Operating range of 1.65V to 3.6V defines compatibility with low-voltage digital and mixed-signal systems. Substitutes must support this range or a compatible subset.
Switching Speed: Maximum switch times of 25ns define temporal performance requirements. Substitutes with faster switching characteristics remain compatible.
Leakage Current and Crosstalk: Leakage of 3nA maximum and crosstalk of -94dB @ 100kHz establish signal integrity thresholds for analog and RF applications.
Package and Thermal Characteristics: 8-WDFN Exposed Pad package with MSL 1 rating defines board-level integration and handling requirements.
Compliance and Status: ROHS3 compliance and obsolete status necessitate active alternatives with current manufacturing status and equivalent certifications.

The ISL43L210IHZ-T is identified as a substitute based on manufacturer lineage (Renesas Electronics Corporation), compatible operating temperature range, equivalent compliance certifications, and overlapping electrical performance envelope within the ISL43L2xx product family.

Parameter Comparison

Parameter	ISL43L121IRZ	ISL43L210IHZ-T
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
Switch Circuit Type	SPST - NC	SPDT
Multiplexer/Demultiplexer Circuit	1:1	2:1
Number of Circuits	2	1
On-State Resistance (Max)	250mOhm	360mOhm (Typ)
Channel-to-Channel Matching (ΔRon)	5mOhm	2mOhm
Voltage - Supply, Single (V+)	1.65V ~ 3.6V	1.1V ~ 4.5V
Switch Time (Ton, Toff) (Max)	25ns, 25ns	15ns, 10ns
Charge Injection	-125pC	25pC
Channel Capacitance (CS(off), CD(off))	182pF, 182pF	40pF
Current - Leakage (IS(off)) (Max)	3nA	30nA
Crosstalk	-94dB @ 100kHz	-70dB @ 100kHz
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount
Package / Case	8-WDFN Exposed Pad	6-TSSOP, SC-88, SOT-363
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	2 (1 Year)

Engineering Selection Recommendations

The ISL43L121IRZ is obsolete and no longer in active production. The ISL43L210IHZ-T is the identified substitute from Renesas Electronics Corporation's active product portfolio.

Substitution Feasibility: The ISL43L210IHZ-T operates within the same temperature range (-40°C to 85°C) and maintains ROHS3 compliance. Both components are manufactured by Renesas Electronics Corporation and share the same ECCN (EAR99) and HTSUS (8542.39.0001) classifications.

Electrical Performance Trade-offs: The ISL43L210IHZ-T exhibits faster switching times (15ns/10ns versus 25ns/25ns), lower channel capacitance (40pF versus 182pF), and improved channel-to-channel matching (2mOhm versus 5mOhm). However, on-state resistance is higher (360mOhm typical versus 250mOhm maximum), leakage current is higher (30nA versus 3nA maximum), and crosstalk performance is reduced (-70dB versus -94dB @ 100kHz).

Topology Differences: The ISL43L121IRZ provides 2 SPST-NC circuits (1:1), while the ISL43L210IHZ-T provides 1 SPDT circuit (2:1). Circuit count and switching topology must be evaluated against application requirements.

Package Considerations: The ISL43L210IHZ-T uses SC-70-6 packaging (6-TSSOP/SOT-363) versus the 8-WDFN Exposed Pad of the ISL43L121IRZ. PCB layout and thermal management strategies may require redesign.

Supply Voltage Compatibility: The ISL43L210IHZ-T supports a wider supply voltage range (1.1V to 4.5V) compared to the ISL43L121IRZ (1.65V to 3.6V), providing additional design flexibility for low-voltage applications.

Moisture Sensitivity: The ISL43L210IHZ-T has MSL 2 (1 Year) versus MSL 1 (Unlimited) for the ISL43L121IRZ. Storage and handling procedures must account for this difference.

Frequently Asked Questions (FAQ)

Q: Can the ISL43L210IHZ-T directly replace the ISL43L121IRZ without circuit modifications?

A: Direct replacement is not recommended without circuit evaluation. The ISL43L210IHZ-T differs in switch circuit topology (SPDT versus SPST-NC), circuit count (1 versus 2), on-state resistance (360mOhm typical versus 250mOhm maximum), and package form factor (SC-70-6 versus 8-WDFN). Applications sensitive to impedance, switching speed, or leakage current must be re-evaluated.

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

A: The ISL43L210IHZ-T offers faster switching performance (15ns/10ns versus 25ns/25ns) and lower capacitance (40pF versus 182pF), but exhibits higher on-state resistance (360mOhm typical), higher leakage current (30nA versus 3nA), and reduced crosstalk isolation (-70dB versus -94dB @ 100kHz). Supply voltage range is broader (1.1V to 4.5V versus 1.65V to 3.6V).

Q: Are both parts RoHS compliant?

A: Yes. Both the ISL43L121IRZ and ISL43L210IHZ-T are ROHS3 compliant and REACH unaffected.

Q: What packaging differences exist?

A: The ISL43L121IRZ uses 8-WDFN Exposed Pad (3x3mm), while the ISL43L210IHZ-T uses SC-70-6 (6-TSSOP/SOT-363). These are different form factors requiring PCB layout redesign and may affect thermal performance.

Q: How do the moisture sensitivity levels differ?

A: The ISL43L121IRZ has MSL 1 (unlimited shelf life), while the ISL43L210IHZ-T has MSL 2 (1-year shelf life). The ISL43L210IHZ-T requires more stringent storage and handling controls to prevent moisture absorption.

Q: Is the ISL43L210IHZ-T suitable for low-voltage applications below 1.65V?

A: The ISL43L210IHZ-T supports operation down to 1.1V, making it compatible with applications requiring supply voltages below the ISL43L121IRZ minimum of 1.65V.

Q: What is the product status of each part?

A: The ISL43L121IRZ is obsolete and no longer manufactured. The ISL43L210IHZ-T is active and in current production by Renesas Electronics Corporation.

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