ISL84780IVZ Equivalent & Substitute Parts

Part Overview

The ISL84780IVZ is a 4-circuit SPDT analog switch manufactured by Renesas Electronics Corporation, designed for low-voltage signal routing applications. This device features a 2:1 multiplexer/demultiplexer configuration with 600mOhm on-state resistance per circuit and operates across a 1.65V to 3.6V single supply voltage range. The ISL84780IVZ is classified as obsolete, making identification of functionally compatible alternatives essential for ongoing system support and new design implementations.

Key Parameters

Parameter	ISL84780IVZ
Manufacturer	Renesas Electronics Corporation
Product Status	Obsolete
Switch Circuit Type	SPDT
Multiplexer/Demultiplexer Configuration	2:1
Number of Circuits	4
On-State Resistance (Max)	600mOhm
Channel-to-Channel Matching (ΔRon)	130mOhm
Supply Voltage Range (V+)	1.65V ~ 3.6V
Switch Time - Ton (Max)	20ns
Switch Time - Toff (Max)	14ns
Charge Injection	-97pC
Channel Capacitance (CS(off), CD(off))	62pF
Leakage Current (IS(off)) (Max)	3nA
Crosstalk	-98dB @ 100kHz
Operating Temperature Range	-40°C ~ 85°C
Package Type	16-TSSOP (0.173", 4.40mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the ISL84780IVZ requires evaluation of the following critical parameters:

Circuit Configuration: The main part provides 4 independent SPDT (2:1) circuits. Substitute parts must maintain equivalent signal routing capability within the same or compatible package footprint.

On-State Resistance: The 600mOhm maximum on-state resistance establishes the impedance baseline for signal integrity. Substitute parts with higher on-state resistance may introduce signal attenuation or increased power dissipation.

Supply Voltage Compatibility: The 1.65V to 3.6V single supply range defines the operating envelope. Substitute parts must support this voltage range or a compatible subset.

Switching Performance: Maximum switch times (Ton, Toff) and charge injection characteristics determine signal fidelity and timing margins in multiplexing applications.

Package and Thermal Characteristics: The 16-TSSOP surface mount package and MSL rating establish physical and environmental constraints for board assembly and storage.

Compliance and Status: RoHS3 compliance and REACH unaffected status are mandatory for regulated applications.

Parameter Comparison

Parameter	ISL84780IVZ (Main)	ISL84781IRZ-T (Substitute)
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
Product Status	Obsolete	Active
Multiplexer/Demultiplexer Configuration	2:1	8:1
Number of Circuits	4	1
On-State Resistance (Max)	600mOhm	750mOhm
Channel-to-Channel Matching (ΔRon)	130mOhm	120mOhm
Supply Voltage Range (V+)	1.65V ~ 3.6V	1.6V ~ 3.6V
Switch Time - Ton (Max)	20ns	25ns
Switch Time - Toff (Max)	14ns	23ns
Charge Injection	-97pC	-39pC
Channel Capacitance (CS(off), CD(off))	62pF	65pF, 470pF
Leakage Current (IS(off)) (Max)	3nA	4nA
Operating Temperature Range	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	16-TSSOP	16-WFQFN Exposed Pad (16-TQFN 3x3)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	2 (1 Year)

Engineering Selection Recommendations

The ISL84781IRZ-T is an active product from Renesas Electronics Corporation and maintains RoHS3 compliance and REACH unaffected status, meeting regulatory requirements equivalent to the ISL84780IVZ.

Circuit Configuration Differences: The ISL84781IRZ-T provides a single 8:1 multiplexer/demultiplexer circuit, whereas the ISL84780IVZ provides four independent 2:1 circuits. This represents a fundamental architectural difference requiring circuit redesign if direct pin-for-pin substitution is required.

Electrical Performance Trade-offs: The ISL84781IRZ-T exhibits higher on-state resistance (750mOhm vs. 600mOhm) and longer switching times (25ns/23ns vs. 20ns/14ns). These parameters may impact signal integrity and power dissipation in bandwidth-sensitive or low-impedance applications.

Package Transition: The ISL84781IRZ-T uses a 16-WFQFN exposed pad package (3x3mm) versus the 16-TSSOP package of the ISL84780IVZ. PCB layout modifications and thermal management considerations are required.

Moisture Sensitivity: The ISL84781IRZ-T carries MSL 2 (1 Year) versus MSL 1 (Unlimited) for the ISL84780IVZ, imposing stricter storage and handling requirements.

Frequently Asked Questions (FAQ)

Q: Can the ISL84781IRZ-T directly replace the ISL84780IVZ in existing designs?

A: Direct pin-for-pin replacement is not possible due to different circuit configurations (4x SPDT 2:1 versus 1x 8:1), different package types (16-TSSOP versus 16-WFQFN), and different pin assignments. Circuit redesign is required.

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

A: The ISL84781IRZ-T has higher on-state resistance (750mOhm vs. 600mOhm), longer switching times (25ns/23ns vs. 20ns/14ns), and lower charge injection (-39pC vs. -97pC). Supply voltage ranges are nearly identical (1.6V-3.6V vs. 1.65V-3.6V).

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both the ISL84780IVZ and ISL84781IRZ-T are RoHS3 compliant and REACH unaffected. However, the ISL84780IVZ is obsolete, while the ISL84781IRZ-T is active.

Q: What packaging considerations apply to the ISL84781IRZ-T?

A: The ISL84781IRZ-T uses a 16-WFQFN exposed pad package (3x3mm) with an exposed thermal pad, requiring different PCB footprint design and potentially improved thermal management compared to the 16-TSSOP package.

Q: Does the ISL84781IRZ-T have stricter handling requirements?

A: Yes. The ISL84781IRZ-T carries MSL 2 (1 Year) moisture sensitivity versus MSL 1 (Unlimited) for the ISL84780IVZ, requiring controlled storage conditions and shorter shelf life management.

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