ISL8499IR - 0.24 Ohm Low-Voltage Quad SPDT Switch | Renesas
MPN: ISL8499IR ✓ ActiveISL8499IR Overview
An analog switch is an integrated semiconductor that routes analog signals between external nodes under digital control. The ISL8499 contains two independent dual-pole, double-throw switching functions, commonly described as a quad SPDT or dual DPDT device. Within the interface IC and analog-switch hierarchy, its low-voltage operation, bidirectional signal path, and low power consumption are particularly useful for portable audio, test, communication, and battery-operated measurement systems.
The principal electrical features include a +1.65 V to +4.5 V single-supply range, low on-resistance across multiple supply voltages, and on-resistance matching between channels of 0.04 ohm. The verified datasheet information also reports on-resistance flatness across the signal range of 0.05 ohm. These characteristics help reduce insertion loss and channel-to-channel resistance variation when routing sensitive analog signals.
The device is designed for 1.8 V-compatible logic when operated from a +3 V supply. With a +4.2 V supply and 2.85 V logic-high inputs, the maximum supply current is 10 microamperes. Power dissipation is reported below 0.2 microwatts under the stated low-power conditions, supporting the use of the ISL8499IR in battery-powered equipment where leakage and standby consumption can affect the usable runtime.
Typical applications include routing audio signals in portable equipment, selecting sensor inputs in test and measurement systems, multiplexing communication channels, and switching low-voltage analog signals in battery-operated instruments. The 15 ns tON and 13 ns tOFF characteristics support fast system reconfiguration, while the low on-resistance limits signal attenuation across the selected channel.
Designers should verify control-logic levels against the selected supply voltage and ensure that switched signals remain within the device's supported analog-signal range. The exposed thermal pad and exposed-pad construction also require a suitable PCB land pattern and adequate copper for heat spreading, particularly when continuously routing signals at higher frequencies or temperatures.
This page consolidates the verified Renesas product information, source-linked pricing and lifecycle references, explicitly identified drop-in relationships, and practical selection guidance. It also separates documented performance from parameters that still require confirmation from the complete manufacturer datasheet or a specific distributor record.
Drop-in alternatives for ISL8499IR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
ISL8499IRZ
✅ Drop-In📋 Reference alternative (not in catalog)
STG3699
✅ Drop-In📋 Reference alternative (not in catalog)
DG2799
✅ Drop-In📋 Reference alternative (not in catalog)
ISL8499IR Maximum Ratings & Electrical Characteristics
| Product Type | Bidirectional quad SPDT (dual DPDT) analog switch |
| Number of Switching Poles | 4 SPDT poles |
| Single-Supply Voltage Range | +1.65 V to +4.5 V |
| On-Resistance at +4.3 V | 0.24 ohm |
| On-Resistance at +3.0 V | 0.26 ohm |
| On-Resistance at +1.8 V | 0.45 ohm |
| On-Resistance Matching Between Channels | 0.04 ohm |
| On-Resistance Flatness Across Signal Range | 0.05 ohm |
| Turn-On Time | 15 ns |
| Turn-Off Time | 13 ns |
| Logic Compatibility | 1.8 V-compatible with a +3 V supply |
| Maximum Supply Current | 10 microamperes at +4.2 V supply and 2.85 V logic-high inputs |
| Power Dissipation | <0.2 microwatt |
| Package | 16-pin QFN |
| Mounting Type | Surface mount |
ISL8499IR 16-pin qfn Pin Configuration Guide
Pin configuration for ISL8499IR (16-pin qfn 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 ISL8499IR.
Refer to the datasheet for full pin configuration.
Typical Applications
ISL8499IR is suitable for 6 applications: Portable Audio Signal Routing, Battery-Powered Test Equipment, Portable Sensor Multiplexing, Low-Voltage Communication Routing, Battery-Charging Signal Selection, Industrial Measurement Interface.
Portable Audio Signal Routing
The ISL8499IR fits portable audio routing because it provides a bidirectional quad SPDT function from a single +1.65 V to +4.5 V supply while maintaining low on-resistance. The manufacturer reports 0.24 ohm at +4.3 V, 0.26 ohm at +3.0 V, and 0.45 ohm at +1.8 V, so the device can attenuate audio paths less as supply voltage falls. Its 15 ns turn-on and 13 ns turn-off times allow rapid source selection. Designers should still confirm signal swing, bandwidth, distortion, and off-isolation in the complete datasheet because those values were not available in the verified excerpts.
Recommended
Battery-Powered Test Equipment
The ISL8499IR is appropriate for battery-powered test equipment that needs to select low-level analog paths without a high-voltage supply. Its single-supply operating range of +1.65 V to +4.5 V supports portable instrumentation, and the documented power dissipation is below 0.2 microwatt under the stated condition. Low on-resistance, 0.04 ohm channel matching, and fast switching can reduce insertion loss and channel imbalance. The system designer should calculate the complete signal-path error, account for leakage and switch capacitance, and confirm the full operating-temperature limits before release.
Recommended
Portable Sensor Multiplexing
The ISL8499IR can multiplex low-voltage sensor outputs in portable monitoring and measurement products. Its dual DPDT organization provides independent routing functions, while bidirectional paths simplify connections between sensors, amplifiers, and data-conversion equipment. At +3.0 V, the documented on-resistance is 0.26 ohm, and the 15 ns turn-on time allows rapid selection among channels. For sensor signals near the supply rails or with very small amplitudes, verify the allowable analog-signal range, leakage, off-isolation, and noise behavior in the full datasheet before choosing the switch.
Recommended
Low-Voltage Communication Routing
The ISL8499IR can route low-voltage communication signals when a design requires rapid, low-resistance channel selection. Its bidirectional quad SPDT topology supports shared data paths, and the manufacturer specifies 0.24 ohm on-resistance at +4.3 V with 15 ns turn-on and 13 ns turn-off times. These characteristics are useful where routing transitions must occur quickly without introducing substantial series resistance. Because the verified excerpts do not provide bandwidth, off-isolation, or channel capacitance, communication-interface suitability must be established using the complete electrical characteristics and a signal-integrity simulation.
Recommended
Battery-Charging Signal Selection
The ISL8499IR can be used to select low-voltage signals in battery-management and charging equipment when the routing requirements fall within its documented limits. Single-supply operation begins at +1.65 V, and the device is optimized for low-voltage portable systems rather than directly switching high battery voltages. The low on-resistance helps limit path loss, while the bidirectional structure can simplify signal-path layouts. Engineers must confirm the maximum switched voltage, supply sequencing behavior, power-off state, and fault-current tolerance in the manufacturer datasheet before applying it across a battery pack.
Recommended
Industrial Measurement Interface
The ISL8499IR is suitable for low-voltage measurement interfaces where four SPDT functions must be routed through a compact surface-mount package. Its 0.04 ohm matching between channels supports consistency across selected paths, and its fast 15 ns turn-on time can reduce settling delays in automated systems. The 16-pin QFN construction also supports compact layouts, although the exposed pad requires the manufacturer land pattern and adequate thermal copper. Industrial deployments should verify the device's specified temperature range, isolation, leakage, and lifecycle status because those details were not included in the supplied excerpts.
Recommended
Recommended Products Summary
Engineering reference data for ISL8499IR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISL8499IRZ | STG3699 | DG2799 |
|---|---|---|---|---|
| Package | 16-pin QFN | 16-pin QFN - same package | 16-pin QFN - same package | 16-pin QFN - same package |
| Brand | Renesas Electronics | Renesas Electronics | STMicroelectronics | Renesas Electronics |
| Pin Compatibility | Reference device | Documented drop-in replacement | Documented pin-compatible drop-in alternative | Documented pin-compatible drop-in alternative |
Key Differentiators
- Directly documented same-package replacement (vs ISL8499IRZ)
- Low on-resistance at +3.0 V supply (vs STG3699)
- Fast and consistent channel switching (vs DG2799)
Design Notes
Follow the exact exposed-pad land pattern and thermal-via recommendation in the manufacturer datasheet for the 16-pin QFN package. The verified excerpts do not provide the pad dimensions, via count, or copper area, so these values must not be guessed. Place the device close to the routed analog nodes to minimize trace resistance and capacitance. Confirm that exposed-pad solderability and assembly land patterns are appropriate for the selected PCB process before releasing production artwork.
Treat the 0.24 ohm on-resistance at +4.3 V as only one part of the complete signal-path error. Include switch capacitance, leakage, off-isolation, source impedance, load impedance, and PCB parasitics when evaluating high-speed or high-impedance signals. The verified data provide 15 ns turn-on and 13 ns turn-off times but do not include bandwidth or capacitance, so obtain those limits from the complete datasheet before setting an operating frequency or rise-time requirement.
Design the supply rail and logic levels around the documented +1.65 V to +4.5 V operating range. The control inputs are stated to be 1.8 V-compatible when using a +3 V supply, and maximum supply current is 10 microamperes with a +4.2 V supply and 2.85 V logic-high inputs. Check whether the external controller can maintain valid logic levels when the supply is low, and account for the device's actual current under the intended switching activity rather than relying only on the low-power headline value.
Do not infer that a same-package replacement is automatically electrically identical. ISL8499IRZ is documented as a complete replacement, while STG3699 and DG2799 are documented pin-compatible alternatives, but the supplied data do not quantify every alternative's voltage limits, leakage, bandwidth, or logic thresholds. For each substitution, compare those parameters, operating-temperature range, qualification, and lifecycle status using the relevant manufacturer datasheet before approval.
Compliance Information
No explicit compliance declarations were present in the supplied verified excerpts. Compliance values are therefore unknown rather than assumed.
