ISL8484IU - Dual SPDT Low-Voltage Analog Switch | Renesas
MPN: ISL8484IU ✗ End of LifeISL8484IU Overview
An analog switch is an integrated interface circuit that routes electrical signals between terminals under digital control. A dual SPDT switch provides two selectable signal paths per switch section, making it useful for selecting one of two sources, routing a measurement signal, or supporting bidirectional communication. The ISL8484 belongs to the broader hierarchy of analog switches, multiplexers, interface ICs, and semiconductors.
The principal feature of the ISL8484IU is its low on-resistance across a low-voltage supply range. Available data lists on-resistance matching between channels as 0.06 Ohm and on-resistance flatness across the signal range as 0.03 Ohm. Power consumption is specified below 0.45 uW, while fast switching action is available when the supply is 4.3 V. These characteristics suit compact equipment operating from a single low-voltage rail.
The device uses separate select and common terminals for each SPDT section. The 10-MSOP surface-mount package is offered in a 0.118-inch by 3.00 mm width format. The supplied data identifies the industrial temperature grade and 10 terminals. A publicly verified pin-number-to-pin-name diagram was not present in the supplied results, so the exact pinout is intentionally left unassigned rather than inferred from generic package conventions.
Typical uses include low-voltage audio routing, sensor and measurement-signal selection, portable test equipment, communication-signal multiplexing, and compact industrial interfaces. For bidirectional signal paths, the control and common terminals must be operated within the voltage limits specified by the manufacturer datasheet. Care is required when switching powered signals because the exact overvoltage and break-before-make behavior should be confirmed from the current datasheet.
A primary design consideration is the relationship between supply voltage and switch resistance. Lower supply operation provides less headroom for the internal switch and corresponds to higher resistance, while operation near 4.5 V provides the lower-resistance behavior listed in the available data. PCB layout should keep routing short and provide a stable return path, especially when the switch handles high-bandwidth or low-amplitude signals.
This product page consolidates the verified manufacturer description, distributor inventory information, package details, switch characteristics, cross-reference findings, and practical engineering guidance. It also separates verified facts from unavailable values so designers can identify the target part quickly while recognizing which parameters still require confirmation in the current manufacturer datasheet.
Drop-in alternatives for ISL8484IU — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
No drop-in alternatives available for this product.
Request AlternativesISL8484IU Maximum Ratings & Electrical Characteristics
| Product Type | Dual SPDT analog switch |
| Number of Switch Circuits | 2 circuits |
| Switch Configuration | 2:1 SPDT per circuit |
| Supply Voltage Range | +1.65 V to +4.5 V |
| Supply Type | Single supply |
| Maximum On-Resistance | 500 mOhm |
| On-Resistance at 4.3 V Supply | 290 mOhm |
| On-Resistance at 3.0 V Supply | 330 mOhm |
| On-Resistance at 1.8 V Supply | 550 mOhm |
| On-Resistance Matching Between Channels | 0.06 Ohm |
| On-Resistance Flatness Across Signal Range | 0.03 Ohm |
| Power Consumption | Less than 0.45 uW |
| Terminal Count | 10 terminals |
| Package | 10-MSOP, 0.118 inch body width, 3.00 mm width |
| Mounting Type | Surface mount |
| Temperature Grade | Industrial |
| Marking Code | 8484 |
ISL8484IU 10-msop, 0.118 inch body width, 3.00 mm width Pin Configuration Guide
Pin configuration for ISL8484IU (10-msop, 0.118 inch body width, 3.00 mm width package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for ISL8484IU.
Refer to the datasheet for full pin configuration.
Typical Applications
ISL8484IU is suitable for 6 applications: Portable Audio Signal Routing, Battery-Powered Sensor Interface, Low-Voltage Measurement Multiplexer, Communication Signal Multiplexing, Industrial Control Signal Selection, Compact Test and Measurement Equipment.
Portable Audio Signal Routing
The ISL8484IU fits portable audio routing because it provides two dual SPDT switch sections from a single +1.65 V to +4.5 V supply while listing power consumption below 0.45 uW. Its on-resistance is listed at 500 mOhm, with detailed values of 290 mOhm at 4.3 V and 550 mOhm at 1.8 V. This permits the device to route headphone, microphone, or auxiliary signals between functional stages without requiring a high-voltage supply. The designer should confirm signal swing, control thresholds, and switching transients against the manufacturer datasheet, especially when routing low-amplitude analog content.
Battery-Powered Sensor Interface
The ISL8484IU can select between sensor outputs or route a sensor signal to an analog measurement block in battery-powered equipment. Its +1.65 V lower supply limit supports low-voltage operation, while the two independent SPDT circuits provide 2:1 routing choices without requiring dual-supply rails. The listed 0.06 Ohm channel matching and 0.03 Ohm on-resistance flatness are useful when preserving amplitude consistency between channels. Because sensor leakage, source impedance, and injected noise can affect accuracy, the final input network and grounding should be validated with the actual source impedance.
Low-Voltage Measurement Multiplexer
The ISL8484IU is suitable for low-voltage measurement multiplexing where two 2:1 SPDT sections can share a common destination under digital control. The verified 500 mOhm maximum on-resistance provides a defined starting point for insertion-loss estimates, while the supply-specific values show 330 mOhm at 3.0 V and 550 mOhm at 1.8 V. Engineers should include switch resistance when calculating source loading and consider input capacitance, leakage, and channel isolation using the current datasheet values before setting the measurement bandwidth.
Communication Signal Multiplexing
The dual SPDT topology of the ISL8484IU supports communication-signal multiplexing in compact systems requiring selectable routes for a pair of channels. Operation from +1.65 V to +4.5 V suits single-rail logic-based equipment, and the available 290 mOhm rating at 4.3 V provides lower resistance than the 500 mOhm family maximum. Signal integrity still depends on trace geometry, return-path continuity, clock rate, and source impedance. For high-speed links, verify the switch's dynamic characteristics and use a complete insertion-loss analysis rather than relying only on the DC resistance.
Industrial Control Signal Selection
The ISL8484IU can select control or diagnostic signals in industrial equipment while its industrial temperature grade aligns with demanding operating environments. Two independent SPDT sections allow a controller to route separate signals through one package, and the low listed power consumption below 0.45 uW minimizes load on low-power supply branches. For factory systems, transient protection and the allowed analog signal range must be evaluated separately from the +1.65 V to +4.5 V control supply. Confirm lifecycle status, temperature limits, and production availability with Renesas or an authorized distributor.
Compact Test and Measurement Equipment
The ISL8484IU is applicable to compact test equipment that must route a source, loopback path, or selected DUT connection through a low-voltage analog switch. Its 10-MSOP surface-mount format supports compact layouts, and two SPDT circuits provide more routing flexibility than a single switch. The 500 mOhm maximum on-resistance should be included in high-impedance probe calculations, while the 0.03 Ohm listed flatness helps when comparing switch paths across the signal range. Verify leakage, capacitance, and allowable overvoltage for the specific measurement source before finalizing the front end.
Engineering reference data for ISL8484IU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Package | 10-MSOP, 10-TFSOP, 0.118 inch body width, 3.00 mm width |
| Brand | Renesas Electronics |
| Switch Type | Dual SPDT analog switch |
| Number of Circuits | 2 circuits |
| Supply Voltage Range | +1.65 V to +4.5 V |
| Maximum On-Resistance | 500 mOhm |
| On-Resistance at 4.3 V | 290 mOhm |
| Power Consumption | Less than 0.45 uW |
| On-Resistance Matching Between Channels | 0.06 Ohm |
| Temperature Grade | Industrial |
Key Differentiators
- Low-voltage dual SPDT implementation (vs MAX4684)
- Supply-dependent resistance remains below 1 Ohm (vs MAX4685)
- Two independent routing sections in one package (vs Single-section SPDT analog switches)
Design Notes
Use the supply-specific on-resistance values when evaluating insertion loss: 290 mOhm at 4.3 V, 330 mOhm at 3.0 V, and 550 mOhm at 1.8 V. The difference becomes important for high-impedance sources because switch resistance can combine with source and load impedance to create an unintended voltage divider. Keep traces short, provide a continuous ground reference, and verify dynamic insertion loss and capacitance using the complete datasheet characteristics when operating at higher signal frequencies.
Confirm that the selected rail remains within the +1.65 V to +4.5 V operating range under startup, transient, and tolerance conditions. The listed power consumption is below 0.45 uW, but total system demand also includes control inputs and leakage paths. Place a local supply bypass capacitor close to the device when the selected design guidance specifies one, and avoid routing switching-node or high-current return paths beneath the analog signal traces.
Do not treat a related ordering suffix or a family-level pin-compatible statement as proof of a board-level drop-in replacement. Confirm package dimensions, exposed-pad requirements, terminal numbering, control polarity, logic thresholds, and analog signal limits against the exact alternative datasheet. The ISL8484IU-T and ISL8484IUZ references identified in the search data differ in packaging or package configuration and were not counted as drop-in alternatives.
Route common and switched-node copper with short paths and minimize loops that could increase parasitic inductance or capacitive coupling. Maintain a stable ground plane beneath the 10-MSOP footprint and keep unrelated switching circuitry away from the signal pins. Before release, inspect the assembled board for solder bridges around the closely spaced MSOP leads and verify that the selected tube or reel packaging orientation matches the PCB assembly process.
Compliance Information
The supplied results do not explicitly extract RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations. The part is an industrial-grade interface IC, so AEC-Q100 is treated as not applicable rather than qualified.
