ISL43640IU-T Equivalent & Substitute Parts

Part Overview

The ISL43640IU-T is a single-circuit SP4T (Single-Pole, 4-Throw) analog switch manufactured by Renesas Electronics Corporation, designed for interface applications requiring 50Ohm on-state resistance and 4:1 multiplexing capability. This part operates across a 2.7V to 12V single supply range with 30ns/28ns switching times and is packaged in a 10-MSOP surface mount configuration.

The ISL43640IU-T is classified as obsolete. Locating equivalent or substitute components is necessary to support ongoing production, maintenance, or redesign efforts where this part is no longer readily available from primary sources.

Key Parameters

Parameter	ISL43640IU-T Value
Switch Circuit Configuration	SP4T
Multiplexer/Demultiplexer Circuit	4:1
Number of Circuits	1
On-State Resistance (Max)	50Ohm
Channel-to-Channel Matching (ΔRon)	500mOhm
Voltage - Supply, Single (V+)	2.7V ~ 12V
Switch Time (Ton, Toff) (Max)	30ns, 28ns
Charge Injection	1.2pC
Channel Capacitance (CS(off), CD(off))	4pF, 11pF
Current - Leakage (IS(off)) (Max)	1nA
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the ISL43640IU-T is determined by the following critical parameters:

Switch Circuit & Multiplexer Configuration: All substitutes must maintain SP4T topology with 4:1 multiplexing in a single circuit
Package Compatibility: All substitutes must use 10-MSOP or equivalent 10-pin surface mount packaging with 0.118" (3.00mm) width
Mounting Type: Surface mount requirement is mandatory
Supply Voltage Range: Minimum overlap of 2.7V to 12V single supply operation
Operating Temperature Range: Must support at least -40°C to 85°C operation
Moisture Sensitivity: MSL 1 (Unlimited) classification required

The substitute parts listed below meet these core electrical and mechanical criteria. However, on-state resistance values vary among substitutes (50Ohm, 80Ohm, 150Ohm), which affects signal path impedance and switching characteristics. Channel-to-channel matching, switching times, and leakage current specifications also differ and must be evaluated against application requirements.

Parameter Comparison

Parameter	ISL43640IU-T	ISL43640IUZ-T	MAX4524CUB+	MAX4524CUB+T	MAX4524EUB+	MAX4524EUB+T	MAX4524LEUB+
Manufacturer	Renesas	Renesas	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim
Switch Circuit	SP4T	SP4T	SP4T	SP4T	SP4T	SP4T	SP4T
Multiplexer Circuit	4:1	4:1	4:1	4:1	4:1	4:1	4:1
On-State Resistance (Max)	50Ohm	50Ohm	150Ohm	150Ohm	150Ohm	150Ohm	80Ohm
Channel-to-Channel Matching (ΔRon)	500mOhm	500mOhm	2Ohm	2Ohm	2Ohm	2Ohm	2Ohm
Voltage - Supply, Single (V+)	2.7V ~ 12V	2.7V ~ 12V	2V ~ 12V	2V ~ 12V	2V ~ 12V	2V ~ 12V	2V ~ 12V
Switch Time (Ton, Toff) (Max)	30ns, 28ns	30ns, 28ns	150ns, 120ns	150ns, 120ns	150ns, 120ns	150ns, 120ns	150ns, 120ns
Charge Injection	1.2pC	1.2pC	0.8pC	0.8pC	0.8pC	0.8pC	0.8pC
Channel Capacitance (CS(off), CD(off))	4pF, 11pF	4pF, 11pF	4pF, 14pF	4pF, 14pF	4pF, 14pF	4pF, 14pF	4pF, 14pF
Current - Leakage (IS(off)) (Max)	1nA	1nA	1nA	1nA	1nA	1nA	2nA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	10-MSOP	10-MSOP	10-uMAX/uSOP	10-uMAX/uSOP	10-uMAX/uSOP	10-uMAX/uSOP	10-uMAX/uSOP
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Renesas Replacement (Preferred for Obsolete Part Recovery)

ISL43640IUZ-T is the active-status equivalent from Renesas Electronics Corporation. It maintains identical electrical specifications to the ISL43640IU-T (50Ohm on-state resistance, 30ns/28ns switching times, 1.2pC charge injection) and operates across the same 2.7V to 12V supply range with -40°C to 85°C temperature rating. The primary difference is product status (Active vs. Obsolete) and packaging format (Tape & Reel vs. standard). ISL43640IUZ-T achieves ROHS3 compliance, whereas the original ISL43640IU-T is RoHS non-compliant. This part is suitable for direct substitution in applications where Renesas component continuity is required.

Analog Devices/Maxim MAX4524 Series (Cross-Manufacturer Alternatives)

The MAX4524 family provides SP4T 4:1 switching functionality across multiple on-state resistance grades. Selection within this family depends on impedance requirements and operating temperature constraints:

MAX4524EUB+ and MAX4524EUB+T (150Ohm): Support the full -40°C to 85°C operating temperature range matching the ISL43640IU-T. These parts are available in both Tube (MAX4524EUB+) and Tape & Reel (MAX4524EUB+T) packaging. Higher on-state resistance (150Ohm vs. 50Ohm) and slower switching times (150ns/120ns vs. 30ns/28ns) must be evaluated against application signal path requirements.
MAX4524LEUB+ (80Ohm): Offers intermediate on-state resistance between the ISL43640IU-T (50Ohm) and standard MAX4524 variants (150Ohm). Supports -40°C to 85°C operation and includes 200MHz -3dB bandwidth specification. Leakage current is 2nA (vs. 1nA for ISL43640IU-T). Tube packaging only.
MAX4524CUB+ and MAX4524CUB+T (150Ohm): Limited to 0°C to 70°C operating temperature range. These parts are suitable only for applications not requiring full -40°C to 85°C coverage. Available in Tube (MAX4524CUB+) and Tape & Reel (MAX4524CUB+T) formats.

All MAX4524 variants achieve ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. Package compatibility with 10-pin surface mount footprints is maintained across all variants.

Frequently Asked Questions (FAQ)

Q: Can ISL43640IUZ-T be used as a direct replacement for ISL43640IU-T?

A: Yes. ISL43640IUZ-T is the active-status equivalent from Renesas with identical electrical specifications (50Ohm on-state resistance, 30ns/28ns switching times, 2.7V to 12V supply, -40°C to 85°C operation). The primary differences are product status (Active vs. Obsolete) and packaging format (Tape & Reel). Both use 10-MSOP surface mount packages with compatible pinouts.

Q: What are the key differences between ISL43640IU-T and MAX4524 variants?

A: The primary differences are on-state resistance (ISL43640IU-T: 50Ohm; MAX4524: 80Ohm or 150Ohm depending on variant), switching speed (ISL43640IU-T: 30ns/28ns; MAX4524: 150ns/120ns), and channel-to-channel matching (ISL43640IU-T: 500mOhm; MAX4524: 2Ohm). All maintain SP4T 4:1 switching topology and 10-pin surface mount packaging. Operating temperature ranges vary by MAX4524 variant.

Q: Which MAX4524 variant should I select if my application requires -40°C to 85°C operation?

A: MAX4524EUB+, MAX4524EUB+T, and MAX4524LEUB+ all support -40°C to 85°C operation. MAX4524CUB+ and MAX4524CUB+T are limited to 0°C to 70°C and are not suitable for full temperature range applications.

Q: Are all substitute parts RoHS compliant?

A: ISL43640IU-T is RoHS non-compliant. ISL43640IUZ-T and all MAX4524 variants (MAX4524CUB+, MAX4524CUB+T, MAX4524EUB+, MAX4524EUB+T, MAX4524LEUB+) are ROHS3 compliant.

Q: What packaging formats are available for each substitute part?

A: ISL43640IUZ-T is available in Tape & Reel (TR) format. MAX4524EUB+ and MAX4524CUB+ are supplied in Tube packaging. MAX4524EUB+T and MAX4524CUB+T are supplied in Tape & Reel (TR) format. MAX4524LEUB+ is available in Tube packaging only. All use 10-pin surface mount packages compatible with ISL43640IU-T footprints.

Q: How do switching times affect circuit performance when substituting ISL43640IU-T with MAX4524 variants?

A: ISL43640IU-T has 30ns turn-on and 28ns turn-off times. MAX4524 variants have 150ns turn-on and 120ns turn-off times. Applications with timing-critical signal switching or high-frequency multiplexing may require circuit redesign or timing margin analysis when transitioning to slower MAX4524 parts.

Q: Can I use MAX4524CUB+ or MAX4524CUB+T in a -40°C application?

A: No. MAX4524CUB+ and MAX4524CUB+T are rated for 0°C to 70°C operation only. For applications requiring -40°C operation, use MAX4524EUB+, MAX4524EUB+T, or MAX4524LEUB+.

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