ISL84781IR Equivalent & Substitute Parts

Part Overview

The ISL84781IR is an 8:1 analog multiplexer IC manufactured by Renesas Electronics Corporation, housed in a 16-TQFN (3x3) surface mount package. This device functions as a single-circuit switch with 750mOhm on-state resistance, designed for low-voltage signal routing applications operating between 1.6V and 3.6V. The ISL84781IR is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain functional compatibility across multiplexer configuration, supply voltage range, operating temperature, and package form factor.

Key Parameters

Parameter	ISL84781IR
Multiplexer Configuration	8:1
Number of Circuits	1
On-State Resistance (Max)	750mOhm
Channel-to-Channel Matching (ΔRon)	120mOhm
Voltage - Supply, Single (V+)	1.6V ~ 3.6V
Switch Time (Ton, Toff) (Max)	25ns, 23ns
Charge Injection	-39pC
Channel Capacitance (CS(off), CD(off))	65pF, 470pF
Current - Leakage (IS(off)) (Max)	4nA
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	16-WFQFN Exposed Pad
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the ISL84781IR is determined by strict adherence to the following parameters:

Critical Parameters (Must Match):

Multiplexer configuration: 8:1
Number of circuits: 1
Package type: 16-TQFN (3x3) with exposed pad
Supply voltage range: 1.6V ~ 3.6V
Operating temperature range: -40°C ~ 85°C
Mounting type: Surface Mount

Allowable Variation Parameters:

On-state resistance (Ron): Substitute parts may have equal or lower Ron values
Channel-to-channel matching (ΔRon): Substitute parts may have equal or lower matching tolerance
Switch timing (Ton, Toff): Substitute parts may have equal or faster switching characteristics
Charge injection: Substitute parts may have equal or lower absolute charge injection values
Channel capacitance: Substitute parts may have equal or lower capacitance values
Leakage current: Substitute parts may have equal or lower leakage specifications

The ISL84781IR has two direct manufacturer equivalents and two similar cross-manufacturer alternatives that meet these criteria.

Parameter Comparison

Parameter	ISL84781IR	ISL84781IRZ	MAX4781ETE+	MAX4781ETE+T
Manufacturer	Renesas Electronics	Renesas Electronics	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim
Multiplexer Configuration	8:1	8:1	8:1	8:1
Number of Circuits	1	1	1	1
On-State Resistance (Max)	750mOhm	750mOhm	1Ohm	1Ohm
Channel-to-Channel Matching (ΔRon)	120mOhm	120mOhm	300mOhm	300mOhm
Voltage - Supply, Single (V+)	1.6V ~ 3.6V	1.6V ~ 3.6V	1.6V ~ 3.6V	1.6V ~ 3.6V
Switch Time Ton (Max)	25ns	25ns	25ns	25ns
Switch Time Toff (Max)	23ns	23ns	15ns	15ns
Charge Injection	-39pC	-39pC	-110pC	-110pC
Channel Capacitance CS(off)	65pF	65pF	38pF	38pF
Channel Capacitance CD(off)	470pF	470pF	310pF	310pF
Current - Leakage (IS(off)) (Max)	4nA	4nA	2nA	2nA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	16-WFQFN Exposed Pad	16-WFQFN Exposed Pad	16-WFQFN Exposed Pad	16-WFQFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	2 (1 Year)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

ISL84781IRZ (Direct Renesas Equivalent)

The ISL84781IRZ is the primary substitute for the obsolete ISL84781IR. Both parts are manufactured by Renesas Electronics and share identical electrical specifications across all critical parameters: 8:1 multiplexer configuration, 750mOhm on-state resistance, 120mOhm channel matching, and identical switch timing characteristics. The ISL84781IRZ is classified as Active product status, ensuring long-term availability and supply continuity. The ISL84781IRZ achieves ROHS3 compliance, whereas the ISL84781IR is non-compliant. Moisture sensitivity level increases from MSL 1 (Unlimited) to MSL 2 (1 Year), requiring appropriate storage and handling protocols. This part is available in Tube packaging.

MAX4781ETE+ and MAX4781ETE+T (Cross-Manufacturer Alternatives)

The MAX4781ETE+ and MAX4781ETE+T are functionally equivalent alternatives manufactured by Analog Devices Inc./Maxim Integrated. Both parts maintain the 8:1 multiplexer configuration, identical supply voltage range (1.6V ~ 3.6V), and identical operating temperature range (-40°C ~ 85°C). The MAX4781 series exhibits superior electrical performance in several parameters: on-state resistance of 1Ohm (versus 750mOhm), faster Toff switching time of 15ns (versus 23ns), lower leakage current of 2nA (versus 4nA), and lower channel capacitance values. Both MAX4781 variants are ROHS3 compliant and maintain MSL 1 (Unlimited) moisture sensitivity. The primary difference between MAX4781ETE+ and MAX4781ETE+T is packaging: MAX4781ETE+ is supplied in Tube, while MAX4781ETE+T is supplied in Cut Tape (CT) & Digi-Reel format. Both parts are classified as Active product status.

Selection Criteria:

For direct pin-compatible replacement with minimal design impact, select ISL84781IRZ. For applications requiring superior electrical performance characteristics and cross-manufacturer qualification, select MAX4781ETE+ or MAX4781ETE+T based on packaging requirements.

Frequently Asked Questions (FAQ)

Q: Can ISL84781IRZ be used as a direct replacement for ISL84781IR without circuit modifications?

A: Yes. The ISL84781IRZ is electrically and mechanically identical to the ISL84781IR across all critical parameters. Both parts feature 8:1 multiplexer configuration, 750mOhm on-state resistance, identical switch timing, and 16-TQFN (3x3) package form factor. No circuit modifications are required. Storage and handling procedures must account for the increased moisture sensitivity level (MSL 2 versus MSL 1).

Q: What are the key differences between ISL84781IRZ and MAX4781ETE+?

A: Both parts are functionally equivalent 8:1 multiplexers with identical supply voltage range and operating temperature. The MAX4781ETE+ offers superior electrical performance: 1Ohm on-state resistance (versus 750mOhm), faster Toff switching (15ns versus 23ns), lower leakage current (2nA versus 4nA), and lower channel capacitance. The ISL84781IRZ maintains tighter channel-to-channel matching (120mOhm versus 300mOhm). Both parts use identical 16-TQFN (3x3) package and are ROHS3 compliant.

Q: Are MAX4781ETE+ and MAX4781ETE+T electrically identical?

A: Yes. MAX4781ETE+ and MAX4781ETE+T are electrically identical. The only difference is packaging format: MAX4781ETE+ is supplied in Tube, while MAX4781ETE+T is supplied in Cut Tape (CT) & Digi-Reel format. Select based on assembly and inventory management requirements.

Q: What is the impact of increased moisture sensitivity level (MSL 2) for ISL84781IRZ?

A: ISL84781IRZ has MSL 2 (1 Year) rating, compared to ISL84781IR MSL 1 (Unlimited). This requires storage in controlled humidity environments and limits shelf life to one year from the date of manufacture. Proper moisture barrier packaging and desiccant storage are necessary. MAX4781 variants maintain MSL 1 (Unlimited) rating, eliminating this constraint.

Q: Can these parts be used interchangeably in high-precision analog signal routing applications?

A: ISL84781IRZ and MAX4781ETE+/MAX4781ETE+T are functionally interchangeable for 8:1 multiplexing applications within the specified supply voltage and temperature ranges. Application-specific performance differences exist: ISL84781IRZ provides superior channel-to-channel matching (120mOhm), while MAX4781 variants provide lower on-state resistance and leakage current. Circuit design must account for these parameter variations when precision signal integrity is critical.

Q: What compliance certifications apply to these substitute parts?

A: ISL84781IRZ, MAX4781ETE+, and MAX4781ETE+T are all ROHS3 compliant and REACH unaffected. All parts carry ECCN EAR99 classification and HTSUS code 8542.39.0001. The original ISL84781IR is RoHS non-compliant. Compliance requirements for your application determine whether ISL84781IRZ or MAX4781 variants are appropriate.

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