ISL43145IRZ Equivalent & Substitute Parts

Part Overview

The ISL43145IRZ is a 4-circuit IC switch manufactured by Renesas Electronics Corporation, configured as SPST NO/NC with 25Ohm on-state resistance in a 16-QFN package. This part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity. The ISL43145IRZ serves applications requiring low-capacitance analog switching with dual supply voltage capability and fast switching performance.

Key Parameters

Parameter	ISL43145IRZ
Switch Circuit Configuration	SPST - NO/NC
Number of Circuits	4
Multiplexer/Demultiplexer Circuit	1:1
On-State Resistance (Max)	25Ohm
Voltage - Supply, Single (V+)	2.7V ~ 12V
Voltage - Supply, Dual (V±)	±2.6V ~ 6V
Switch Time (Ton, Toff) (Max)	65ns, 50ns
Operating Temperature	-40°C ~ 85°C
Package / Case	16-VQFN Exposed Pad
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the ISL43145IRZ is determined by the following critical parameters:

Switch circuit configuration (SPST - NO/NC topology)
Number of circuits (4-channel requirement)
Multiplexer/demultiplexer circuit ratio (1:1)
Package type (16-QFN form factor with exposed pad)
Supply voltage compatibility (single and dual supply ranges)
On-state resistance performance envelope
RoHS3 compliance and regulatory alignment

The ADG1613BCPZ-REEL7 qualifies as a substitute based on matching switch topology, circuit count, multiplexer ratio, and package footprint. Both parts maintain ROHS3 compliance and operate within overlapping supply voltage specifications. The substitute part is classified as active product status, providing long-term availability assurance.

Parameter Comparison

Parameter	ISL43145IRZ	ADG1613BCPZ-REEL7	Notes
Manufacturer	Renesas Electronics Corporation	Analog Devices Inc.	Different manufacturers
Switch Circuit	SPST - NO/NC	SPST - NO/NC	Identical topology
Number of Circuits	4	4	Identical
Multiplexer/Demultiplexer Circuit	1:1	1:1	Identical
On-State Resistance (Max)	25Ohm	1.1Ohm	Substitute has lower resistance
Voltage - Supply, Single (V+)	2.7V ~ 12V	3.3V ~ 16V	Overlapping range; substitute supports higher maximum
Voltage - Supply, Dual (V±)	±2.6V ~ 6V	±3.3V ~ 8V	Overlapping range; substitute supports higher maximum
Switch Time (Ton, Toff) (Max)	65ns, 50ns	156ns, 87ns	Original part has faster switching
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	Substitute supports extended temperature range
Package / Case	16-VQFN Exposed Pad	16-VQFN Exposed Pad, CSP	Compatible footprint
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical compliance
Product Status	Obsolete	Active	Substitute offers ongoing availability

Engineering Selection Recommendations

The ADG1613BCPZ-REEL7 is suitable as a substitute for the obsolete ISL43145IRZ based on the following engineering criteria:

Identical switch topology (SPST - NO/NC) and circuit configuration (4-channel, 1:1 multiplexer ratio)
Compatible 16-QFN package footprint with exposed pad
Overlapping supply voltage ranges with extended maximum ratings
ROHS3 compliance and regulatory alignment
Active product status ensuring procurement continuity and long-term availability

Design considerations for substitution include verification that the lower on-state resistance (1.1Ohm vs. 25Ohm) and extended operating temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C) are compatible with the application requirements. The substitute part exhibits slower switch times (156ns/87ns vs. 65ns/50ns), which must be evaluated against timing-critical circuit requirements.

Frequently Asked Questions (FAQ)

Q: What makes the ADG1613BCPZ-REEL7 a valid substitute for the ISL43145IRZ?

A: Both parts share identical switch circuit topology (SPST - NO/NC), number of circuits (4), multiplexer ratio (1:1), and compatible 16-QFN package footprint. Supply voltage ranges overlap, and both maintain ROHS3 compliance. The substitute part is active product status, addressing the obsolescence of the original part.

Q: Are there pin-to-pin compatibility concerns?

A: Both parts use the 16-QFN (4x4) package with exposed pad. PCB layout compatibility is maintained. Functional pin assignments must be verified against individual device datasheets to confirm signal routing alignment.

Q: How does the lower on-state resistance of the substitute part affect circuit performance?

A: The ADG1613BCPZ-REEL7 exhibits 1.1Ohm on-state resistance compared to 25Ohm for the ISL43145IRZ. This lower resistance reduces signal attenuation and power dissipation in switching applications. Circuit designs must confirm that lower resistance does not introduce unintended signal coupling or impedance mismatches.

Q: What is the impact of different switch times between these parts?

A: The ISL43145IRZ switches faster (65ns/50ns) than the ADG1613BCPZ-REEL7 (156ns/87ns). Applications with strict timing requirements must evaluate whether the slower switching performance of the substitute part meets system specifications.

Q: Does the extended operating temperature range of the substitute part create compatibility issues?

A: The ADG1613BCPZ-REEL7 operates to 125°C versus 85°C for the ISL43145IRZ. This extended range is a superset of the original part's specification and does not create compatibility issues. Applications operating within the original temperature range remain fully supported.

Q: What packaging format differences exist between these parts?

A: The ISL43145IRZ is supplied in standard packaging, while the ADG1613BCPZ-REEL7 is supplied in Tape & Reel (TR) format. Both use identical 16-QFN footprints suitable for automated assembly. Procurement and handling procedures may differ based on packaging format.

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