ISL84543IP Equivalent & Substitute Parts

Part Overview

The ISL84543IP is a 2-circuit IC switch manufactured by Renesas Electronics Corporation, featuring SPST NO/NC configuration with 60Ohm on-state resistance in an 8-DIP package. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. The part operates across a 2.7V to 12V supply range with 100ns/75ns switching times and is suitable for analog signal switching applications requiring low on-state resistance and minimal crosstalk.

Key Parameters

Parameter	Value
Switch Circuit Configuration	SPST - NO/NC
Number of Circuits	2
Multiplexer/Demultiplexer Circuit	1:1
On-State Resistance (Max)	60Ohm
Channel-to-Channel Matching (ΔRon)	800mOhm
Voltage - Supply, Single (V+)	2.7V ~ 12V
Switch Time (Ton, Toff) (Max)	100ns, 75ns
Charge Injection	1pC
Channel Capacitance (CS(off), CD(off))	8pF, 8pF
Current - Leakage (IS(off)) (Max)	100pA
Crosstalk	-90dB @ 1MHz
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the ISL84543IP is determined by strict equivalence across the following critical parameters:

Switch Circuit Configuration: Must be SPST - NO/NC
Number of Circuits: Must be 2
Multiplexer/Demultiplexer Circuit: Must be 1:1
On-State Resistance (Max): Must be 60Ohm
Channel-to-Channel Matching (ΔRon): Must be 800mOhm
Package / Case: Must be 8-DIP (0.300", 7.62mm)
Mounting Type: Must be Through Hole

The MAX325CPA+ and MAX325EPA+ from Analog Devices Inc./Maxim Integrated meet all core functional and mechanical requirements. Both parts maintain identical switch circuit topology, circuit count, impedance characteristics, and physical packaging. Differences in supply voltage range (2.7V ~ 16V vs. 2.7V ~ 12V), switching time specifications, and operating temperature ranges represent extended or modified performance envelopes that do not preclude substitution in applications designed for the ISL84543IP baseline specifications.

Parameter Comparison

Parameter	ISL84543IP	MAX325CPA+	MAX325EPA+
Manufacturer	Renesas Electronics Corporation	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Product Status	Obsolete	Active	Active
Switch Circuit	SPST - NO/NC	SPST - NO/NC	SPST - NO/NC
Number of Circuits	2	2	2
Multiplexer/Demultiplexer Circuit	1:1	1:1	1:1
On-State Resistance (Max)	60Ohm	60Ohm	60Ohm
Channel-to-Channel Matching (ΔRon)	800mOhm	800mOhm	800mOhm
Voltage - Supply, Single (V+)	2.7V ~ 12V	2.7V ~ 16V	2.7V ~ 16V
Switch Time (Ton, Toff) (Max)	100ns, 75ns	150ns, 100ns	150ns, 100ns
Charge Injection	1pC	1pC	1pC
Channel Capacitance (CS(off), CD(off))	8pF, 8pF	9pF, 9pF	9pF, 9pF
Current - Leakage (IS(off)) (Max)	100pA	100pA	100pA
Crosstalk	-90dB @ 1MHz	-85dB @ 1MHz	-85dB @ 1MHz
Operating Temperature	-40°C ~ 85°C (TA)	0°C ~ 70°C (TA)	-40°C ~ 85°C (TA)
Package / Case	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MAX325EPA+ is the preferred substitute for the ISL84543IP in new designs and ongoing system support. This part maintains full functional equivalence across all critical electrical parameters while offering active product status, extended supply voltage range (2.7V ~ 16V), and operating temperature coverage (-40°C ~ 85°C) that matches the original specification. RoHS3 compliance provides regulatory alignment for modern manufacturing environments.

MAX325CPA+ serves as an alternative substitute with identical electrical characteristics and active availability. Selection of this variant should be limited to applications where the operating temperature range of 0°C ~ 70°C is sufficient, as this represents a narrower envelope than both the ISL84543IP and MAX325EPA+.

Both MAX325 variants exhibit slightly relaxed switching time specifications (150ns/100ns vs. 100ns/75ns) and marginally increased channel capacitance (9pF vs. 8pF) compared to the ISL84543IP. These parameter differences remain within acceptable tolerance for applications originally designed around ISL84543IP baseline performance.

Frequently Asked Questions (FAQ)

Q: Can MAX325CPA+ and MAX325EPA+ be used interchangeably as substitutes for ISL84543IP?

A: Both parts meet the core functional requirements for ISL84543IP substitution. Selection between them depends on operating temperature requirements. MAX325EPA+ covers the full -40°C ~ 85°C range, matching the original specification. MAX325CPA+ is limited to 0°C ~ 70°C and should be selected only when this temperature envelope is confirmed acceptable for the application.

Q: What are the implications of the extended supply voltage range in MAX325 parts?

A: The MAX325 series supports 2.7V ~ 16V operation compared to ISL84543IP's 2.7V ~ 12V range. This extended capability does not affect substitution suitability for applications designed within the original 12V maximum specification. The parts remain fully functional and compatible at all voltages within the ISL84543IP operating envelope.

Q: How do the switching time differences affect circuit performance?

A: MAX325 parts specify 150ns/100ns switching times versus ISL84543IP's 100ns/75ns. Applications originally designed for ISL84543IP performance will experience slightly slower switching transitions with MAX325 substitutes. This difference is typically acceptable for general analog switching applications but should be evaluated in time-critical signal routing or high-frequency multiplexing scenarios.

Q: Are there package or pinout differences between these parts?

A: All three parts use identical 8-DIP (0.300", 7.62mm) through-hole packaging with matching pinout. Direct board-level substitution is supported without layout modifications.

Q: What is the significance of RoHS compliance differences?

A: ISL84543IP is RoHS non-compliant while MAX325CPA+ and MAX325EPA+ are ROHS3 compliant. For new designs and systems subject to RoHS regulations, the MAX325 variants provide regulatory alignment. Existing systems using ISL84543IP may continue operation without modification, as RoHS compliance applies to manufacturing and distribution rather than end-use performance.

Q: How do crosstalk specifications compare?

A: ISL84543IP specifies -90dB crosstalk at 1MHz while MAX325 parts specify -85dB. The 5dB difference represents slightly higher crosstalk in MAX325 variants. For applications with stringent crosstalk requirements, this parameter difference should be evaluated against system noise margins and signal integrity specifications.

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