ISL8484IR - 4.5V Dual SPDT Low-RON Switch | Renesas
N.º de pieza: ISL8484IR ✓ ActivoISL8484IR Descripción general
An analog switch is a semiconductor device that connects or disconnects an electrical signal path with controlled resistance. In the product hierarchy, the ISL8484IR is an analog switch and multiplexer within the broader interface IC category. Each SPDT configuration provides a common terminal, one normally closed throw, and one normally open throw, making the device useful for signal routing, polarity selection, test-point isolation, and compact analog multiplexing.
The defining feature of the ISL8484IR is its low channel resistance across a low-voltage supply range. The manufacturer datasheet also identifies it as a pin-compatible replacement for the MAX4684 and MAX4685. Its low power consumption, specified below 0.45 microwatt in the cited operating conditions, and fast switching behavior make it appropriate for battery-powered and portable equipment where signal-path resistance and energy use both matter.
The two independent SPDT switches provide routing flexibility without requiring two separate packages. Matching and flatness characteristics help reduce channel-dependent attenuation and distortion when a design switches between sources or measures multiple nodes. The bidirectional signal path also permits operation in either current direction, although the permitted voltage and current limits must remain within the manufacturer ratings.
Typical uses include low-voltage audio routing, sensor selection, test and measurement interfaces, portable instrumentation, and general-purpose power or signal multiplexing. The low 1.65 V minimum supply supports systems operating from a single lithium-cell rail or other low-voltage source. In precision analog paths, engineers should verify the actual ON-resistance, leakage, charge injection, and switching timing under the intended signal amplitude and frequency.
The primary design consideration is preserving the exposed-pad thermal and electrical requirements of the 10-DFN package. Place the exposed pad on a PCB thermal-via and ground-plane structure, keep high-current paths physically short, and confirm the selected switch state during power-up. Because the supplied search data does not include the complete pin table, engineers should download the Renesas datasheet before assigning signals to physical pins.
This page consolidates the verified manufacturer description, parametric ON-resistance data, operating-voltage range, package information, and cross-reference evidence. It also distinguishes documented drop-in replacements from package or packaging variants that are not true PCB drop-in choices, helping engineers evaluate replacement risk before redesigning a board.
Alternativas directas para ISL8484IR — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
MAX4684
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX4685
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL8484IR Valores máximos y características eléctricas
| Product Type | Dual SPDT analog switch |
| Number of Switches | 2 |
| Switch Configuration | Dual single-pole/double-throw (SPDT) |
| Signal Direction | Bidirectional |
| Supply Voltage Range | +1.65 V to +4.5 V |
| ON-Resistance at 4.3 V | 0.29 ohm |
| ON-Resistance at 3.0 V | 0.33 ohm |
| ON-Resistance at 1.8 V | 0.55 ohm |
| ON-Resistance Matching Between Channels | 0.06 ohm |
| ON-Resistance Flatness Across Signal Range | 0.03 ohm |
| Power Consumption | <0.45 microwatt |
| Encapsulado | 10-DFN with exposed pad, 3.0 mm x 3.0 mm |
| Tipo de montaje | Surface mount |
| Termination Finish | 100% matte tin, e3 |
| Estado RoHS | Compliant |
| Lead-Free Status | Pb-free |
Guía de configuración de pines de ISL8484IR 10-dfn with exposed pad, 3.0 mm x 3.0 mm
Configuración de pines para ISL8484IR (encapsulado 10-dfn with exposed pad, 3.0 mm x 3.0 mm). La numeración de pines, las funciones y los diagramas de conexión se definen en la hoja de datos del fabricante. Consúltela para conocer el footprint exacto y las directrices de soldadura.
No hay datos detallados de patillaje disponibles para ISL8484IR.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
ISL8484IR es adecuado para 6 aplicacións: Portable Audio Signal Routing, Low-Voltage Sensor Multiplexing, Battery-Powered Test Point Multiplexing, Battery Management Signal Selection, Automotive and Industrial Interface Routing, General-Purpose Power Path Selection.
Portable Audio Signal Routing
The ISL8484IR is suitable for portable audio routing because its two bidirectional SPDT switches operate from +1.65 V to +4.5 V while maintaining low ON-resistance. At 3.0 V, the documented resistance is 0.33 ohm, while channel matching is specified at 0.06 ohm. A designer can use each switch to choose between two low-level sources without adding a series amplifier. Before layout, verify the audio bandwidth, signal amplitude, leakage, and charge-injection limits in the complete datasheet, and connect the exposed pad to the recommended PCB thermal and ground structure.
Recomendado
Low-Voltage Sensor Multiplexing
The ISL8484IR can multiplex two low-voltage sensor paths through each of its SPDT channels. Its bidirectional operation allows either signal direction, and its 0.29 ohm ON-resistance at 4.3 V helps limit insertion loss when routing precision sensor outputs. The 0.03 ohm flatness specification also helps maintain more consistent behavior across the signal range. Designers should confirm input capacitance, leakage, settling time, and the maximum input voltage for the selected sensor interface before using the device in a precision acquisition chain.
Recomendado
Battery-Powered Test Point Multiplexing
The ISL8484IR fits low-voltage test-point multiplexing because it supports a +1.65 V minimum supply, consumes less than 0.45 microwatt under the cited conditions, and offers fast switching behavior. Two independent SPDT channels can isolate or redirect circuit nodes during board characterization without using two separate packages. The exposed-pad DFN construction also supports compact layouts, but test engineers should validate leakage, off-state rejection, and signal integrity at the frequencies used by the instrument.
Recomendado
Battery Management Signal Selection
The ISL8484IR can select or isolate battery-management signals where the supply rail remains within the +1.65 V to +4.5 V operating range. Its low ON-resistance reduces the voltage drop introduced into a routed measurement path, while the two SPDT channels provide independent selection functions. In a battery pack, engineers should check the absolute maximum signal voltage, leakage current, and behavior during charge transitions. The exposed pad should be connected according to the manufacturer package layout to maintain electrical and thermal integrity.
Recomendado
Automotive and Industrial Interface Routing
The dual SPDT topology can support compact routing in industrial and automotive electronic systems, subject to the ISL8484IR's specified electrical limits. The 0.55 ohm resistance at 1.8 V, 0.33 ohm at 3.0 V, and 0.29 ohm at 4.3 V provide useful design guidance across common low-voltage rails. The verified data does not state AEC-Q100 qualification, so it should not be assumed for safety-critical automotive use. Engineers must verify temperature range, transient immunity, and lifecycle suitability from the complete controlled documentation.
Recomendado
General-Purpose Power Path Selection
The ISL8484IR can route a low-voltage supply or control node between two destinations when the selected current and voltage remain within the device ratings. Its ON-resistance is low relative to many general-purpose routing paths, and its matching and flatness figures support predictable channel behavior. Because the supplied excerpts do not provide continuous current, power dissipation, or absolute maximum limits, those values must be checked in the manufacturer datasheet. The exposed pad and copper thermal path must also be designed before using the switch in a sustained power path.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ISL8484IR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MAX4684 | MAX4685 |
|---|---|---|---|
| Package | 10-DFN with exposed pad, 3.0 mm x 3.0 mm | 10-DFN | 10-DFN |
| Brand | Renesas Electronics | Maxim Integrated | Maxim Integrated |
| Pin Compatibility | Documented pin-compatible replacement for MAX4684 and MAX4685 | Pin-compatible replacement relationship documented by Renesas | Pin-compatible replacement relationship documented by Renesas |
Diferenciadores clave
- Manufacturer-documented cross-brand replacement path (frente a MAX4684 and MAX4685)
- Low ON-resistance across common low-voltage rails (frente a MAX4684)
- Defined channel matching and signal-range flatness (frente a MAX4685)
- Very low stated power consumption (frente a MAX4684)
Notas de diseño
Follow the manufacturer exposed-pad layout exactly. Place thermal vias within or immediately beneath the 10-DFN exposed pad and connect the pad to a low-impedance ground plane using the land pattern in the Renesas datasheet. Maintain short input and output traces because trace resistance adds directly to the specified 0.29 ohm to 0.55 ohm ON-resistance. Keep the two SPDT common and throw routes physically separated where crosstalk or unintended coupling could affect precision signals.
Do not treat the datasheet ON-resistance as the complete signal-path impedance. Connector resistance, PCB traces, switch capacitance, source impedance, and load impedance all affect attenuation and settling. The documented 0.03 ohm flatness across the signal range is useful for comparing channels, but the complete leakage, charge-injection, bandwidth, and timing specifications must be checked before operating the analog path at high frequency.
The supplied datasheet excerpt specifies power consumption below 0.45 microwatt under its stated conditions, but it does not include the complete test conditions or maximum continuous signal current. Therefore, no universal dissipation calculation should be applied. For a power-routing design, estimate dissipation as I squared multiplied by the effective ON-resistance, add signal-path power, compare the result with the manufacturer limits, and verify junction temperature using the package thermal data.
The ISL8484IU and ISL8484IR are not drop-in alternatives because the verified comparison identifies different packages: 10-MSOP for ISL8484IU and 10-DFN for ISL8484IR. Likewise, reel, tape-and-reel, or temperature-grade suffixes should not be treated as PCB drop-in alternatives. Use MAX4684 and MAX4685 only after checking their complete terminal assignments and electrical limits against the current Renesas datasheet.
Información de cumplimiento
The verified manufacturer PDF excerpt states that the Pb-free plastic package uses 100% matte tin with anneal, e3 termination finish, and is RoHS compliant and compatible with SnPb and Pb-free soldering. No explicit REACH, halogen-free, conflict-minerals, or AEC-Q100 declaration was supplied.
