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ISL84521IVZ Equivalent & Substitute Parts
Part Overview
The ISL84521IVZ is a 4-circuit SPST-NC analog switch manufactured by Renesas Electronics Corporation, designed for low-voltage signal switching applications. This device features 100Ohm on-state resistance and operates across single supply (2V to 12V) or dual supply (±2V to 6V) configurations. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements.
Substiute Parts
Key Parameters
| Parameter | ISL84521IVZ |
|---|---|
| Manufacturer | Renesas Electronics Corporation |
| Product Status | Obsolete |
| Switch Circuit Configuration | SPST - NC (Single Pole Single Throw - Normally Closed) |
| Number of Circuits | 4 |
| Multiplexer/Demultiplexer Circuit | 1:1 |
| On-State Resistance (Max) | 100Ohm |
| Channel-to-Channel Matching (ΔRon) | 1Ohm |
| Voltage - Supply, Single (V+) | 2V ~ 12V |
| Voltage - Supply, Dual (V±) | ±2V ~ 6V |
| Switch Time (Ton, Toff) (Max) | 80ns, 30ns |
| Charge Injection | 1pC |
| Channel Capacitance (CS(off), CD(off)) | 2pF, 2pF |
| Current - Leakage (IS(off)) (Max) | 1nA |
| Crosstalk | -90dB @ 100kHz |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 16-TSSOP (0.173", 4.40mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the ISL84521IVZ is determined by the following critical parameters:
- Switch circuit configuration (SPST - NC topology)
- Number of circuits (4-circuit requirement)
- Multiplexer/demultiplexer circuit ratio (1:1)
- Package type (16-TSSOP form factor)
- On-state resistance compatibility (100Ohm nominal)
- Supply voltage range overlap
- Operating temperature range
- RoHS and MSL compliance
Substitute parts are grouped into two categories:
Direct Equivalents: Parts with identical or superior electrical specifications across all critical parameters, enabling drop-in replacement without circuit redesign.
Compatible Alternatives: Parts with different on-state resistance values or supply voltage ranges that require circuit evaluation but maintain the same package, topology, and core functionality.
Parameter Comparison
| Parameter | ISL84521IVZ | MAX4521EUE+ | ADG1611BRUZ | ADG1611BRUZ-REEL | DG454EQ-T1-E3 | MAX4711EUE+ | MAX4711EUE+T |
|---|---|---|---|---|---|---|---|
| Manufacturer | Renesas | Analog Devices/Maxim | Analog Devices | Analog Devices | Vishay Siliconix | Analog Devices/Maxim | Analog Devices/Maxim |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active |
| Switch Circuit | SPST - NC | SPST - NC | SPST - NC | SPST - NC | SPST - NC | SPST - NC | SPST - NC |
| Number of Circuits | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Multiplexer/Demultiplexer | 1:1 | 1:1 | 1:1 | 1:1 | 1:1 | 1:1 | 1:1 |
| On-State Resistance (Max) | 100Ohm | 100Ohm | 1.1Ohm | 1.1Ohm | 5.3Ohm | 25Ohm | 25Ohm |
| Channel-to-Channel Matching (ΔRon) | 1Ohm | 1Ohm | 30mOhm | 30mOhm | 120mOhm | 200mOhm | 200mOhm |
| Voltage - Supply, Single (V+) | 2V ~ 12V | 2V ~ 12V | 3.3V ~ 16V | 3.3V ~ 16V | 12V ~ 36V | 2.7V ~ 11V | 2.7V ~ 11V |
| Voltage - Supply, Dual (V±) | ±2V ~ 6V | ±2V ~ 6V | ±3.3V ~ 8V | ±3.3V ~ 8V | ±5V ~ 15V | ±2.7V ~ 5.5V | ±2.7V ~ 5.5V |
| Switch Time (Ton, Toff) (Max) | 80ns, 30ns | 80ns, 30ns | 156ns, 87ns | 156ns, 87ns | 118ns, 97ns | 125ns, 80ns | 125ns, 80ns |
| Charge Injection | 1pC | 1pC | 170pC | 170pC | 22pC | 25pC | 25pC |
| Channel Capacitance (CS(off), CD(off)) | 2pF, 2pF | 2pF, 2pF | 60pF, 60pF | 60pF, 60pF | 31pF, 34pF | 8pF, 8pF | 8pF, 8pF |
| Current - Leakage (IS(off)) (Max) | 1nA | 1nA | 300pA | 300pA | 500pA | 500pA | 500pA |
| Crosstalk | -90dB @ 100kHz | -90dB @ 100kHz | -110dB @ 1MHz | -110dB @ 1MHz | -85dB @ 1MHz | -87dB @ 1MHz | -87dB @ 1MHz |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 85°C | -40°C ~ 85°C |
| Package / Case | 16-TSSOP | 16-TSSOP | 16-TSSOP | 16-TSSOP | 16-TSSOP | 16-TSSOP | 16-TSSOP |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| MSL | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
MAX4521EUE+ (Direct Equivalent - Recommended Primary Substitute)
The MAX4521EUE+ from Analog Devices/Maxim Integrated provides identical electrical specifications to the ISL84521IVZ across all critical parameters: 100Ohm on-state resistance, 1Ohm channel-to-channel matching, 2V to 12V single supply range, and ±2V to 6V dual supply range. This part maintains the same 16-TSSOP package and operating temperature range (-40°C to 85°C). The device is currently in active production status with ROHS3 compliance and MSL 1 rating. This part enables direct replacement without circuit modification.
MAX4711EUE+ and MAX4711EUE+T (Compatible Alternatives)
These Maxim Integrated parts feature 25Ohm on-state resistance with 200mOhm channel-to-Channel matching. They operate within overlapping supply voltage ranges (2.7V to 11V single supply, ±2.7V to 5.5V dual supply) and maintain the same 16-TSSOP package. These alternatives are suitable for applications where higher on-state resistance is acceptable and can reduce power dissipation in certain circuit topologies. Both are active products with ROHS3 compliance.
ADG1611BRUZ and ADG1611BRUZ-REEL (Compatible Alternatives)
Analog Devices ADG1611 series parts offer significantly lower on-state resistance (1.1Ohm) with superior channel-to-channel matching (30mOhm). These devices support extended supply voltage ranges (3.3V to 16V single supply, ±3.3V to 8V dual supply) and extended operating temperature (-40°C to 125°C). The lower on-state resistance reduces signal attenuation in analog switching applications. Both variants are active products with ROHS3 compliance. ADG1611BRUZ-REEL provides reel packaging for automated assembly.
DG454EQ-T1-E3 (Compatible Alternative)
The Vishay Siliconix DG454 offers 5.3Ohm on-state resistance with 120mOhm channel-to-channel matching. This part operates at higher supply voltages (12V to 36V single supply, ±5V to 15V dual supply) and supports extended operating temperature (-40°C to 125°C). The DG454 is suitable for higher-voltage switching applications where the ISL84521IVZ supply range is insufficient. This part is active with ROHS3 compliance.
All substitute parts maintain ROHS3 compliance and MSL 1 ratings, ensuring compatibility with modern manufacturing and environmental requirements.
Frequently Asked Questions (FAQ)
Q: Can MAX4521EUE+ replace ISL84521IVZ without circuit changes?
A: Yes. The MAX4521EUE+ is a direct electrical equivalent with identical on-state resistance (100Ohm), supply voltage ranges, and operating temperature specifications. The 16-TSSOP package is pin-compatible. No circuit modifications are required.
Q: What is the primary difference between MAX4521EUE+ and ADG1611BRUZ?
A: The primary difference is on-state resistance: MAX4521EUE+ provides 100Ohm while ADG1611BRUZ provides 1.1Ohm. The ADG1611 also supports higher supply voltages (up to 16V single supply versus 12V) and extended operating temperature (125°C maximum). Selection depends on application requirements for signal attenuation and voltage range.
Q: Are all substitute parts available in the same 16-TSSOP package?
A: Yes. All listed substitute parts use the 16-TSSOP package with identical 0.173" width and 4.40mm dimensions. Footprint compatibility is maintained across all alternatives.
Q: Which substitute offers the lowest on-state resistance?
A: The ADG1611BRUZ and ADG1611BRUZ-REEL offer the lowest on-state resistance at 1.1Ohm maximum. This reduces signal loss in analog switching applications but requires verification that the higher supply voltage range (3.3V to 16V) is compatible with your circuit design.
Q: What is the difference between ADG1611BRUZ and ADG1611BRUZ-REEL?
A: Both parts are electrically identical. ADG1611BRUZ is supplied in tube packaging, while ADG1611BRUZ-REEL is supplied in cut tape and Digi-Reel format for automated assembly processes. Selection depends on manufacturing requirements.
Q: Can I use DG454EQ-T1-E3 in a circuit designed for ISL84521IVZ?
A: The DG454 requires circuit evaluation. While it maintains the same 4-circuit SPST-NC topology and 16-TSSOP package, it operates at higher supply voltages (12V to 36V minimum) and has different on-state resistance (5.3Ohm). Use only if your circuit can accommodate these specifications.
Q: Are all substitute parts RoHS compliant?
A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity level), meeting current environmental and manufacturing standards.
Q: Which substitute has the fastest switching time?
A: The ISL84521IVZ and MAX4521EUE+ both specify 80ns turn-on and 30ns turn-off times. The MAX4711 series specifies 125ns turn-on and 80ns turn-off. The ADG1611 and DG454 have slower switching times (156ns and 118ns turn-on respectively). For timing-critical applications, MAX4521EUE+ maintains the original performance.
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