ISL84781IR - 8:1 Analog Multiplexer, 750mOhm, 16-TQFN | Renesas Electronics
MPN： ISL84781IR ✓ 啟用中ISL84781IR 概覽
An analog multiplexer is a semiconductor switching device that routes one of several input signals to a common output. The ISL84781IR belongs to the broader interface IC and analog switch hierarchy, combining an 8:1 signal topology with low-voltage operation, low leakage, and fast switching. Its single-supply architecture is useful where system rails are limited to low voltages and where preserving signal amplitude across the selected channel is important.
The ISL84781IR offers an on-resistance of 0.4 ohm with a 3.0 V supply and 0.55 ohm with a 1.8 V supply. Typical channel matching is 0.12 ohm, while on-resistance flatness across the signal range is 0.056 ohm. The low-voltage operation is supported by a supply range of 1.6 V to 3.6 V, and power consumption is specified below 0.2 microwatts in the manufacturer product-page summary.
Fast switching makes the device suitable for instrumentation, test and measurement, communications, and other systems that need to select among multiple analog inputs. The manufacturer lists turn-on time of 16 ns and turn-off time of 13 ns with a 3 V supply. Break-before-make operation is guaranteed, helping prevent two channels from being connected together during address transitions. An inhibit input can simultaneously open all signal paths, providing a controlled way to isolate the selected channel.
The 16-pin thin QFN package supports compact PCB layouts, but its exposed pad and pin-assignment requirements should be followed exactly. Use the manufacturer pin-description table when assigning tracks, and keep analog routing away from fast digital edges. The low on-resistance makes the part useful for low-impedance sensor and signal-chain nodes, while the rail-to-rail signal capability helps preserve dynamic range when the input range approaches the supply limits.
This page combines manufacturer specifications, cross-reference information, design guidance, and practical application notes for engineers evaluating the ISL84781IR in compact low-voltage routing systems.
直接替換替代品，適用於 ISL84781IR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
ISL84781IRZ
✅ 直接替換📋 參考替代品（不在目錄中）
MAX4781ETE+T
✅ 直接替換📋 參考替代品（不在目錄中）
MAX4617
✅ 直接替換📋 參考替代品（不在目錄中）
ISL84781IR 規格
| Product Type | 8-to-1 analog multiplexer |
| Number of Channels | 8:1 |
| On-Resistance at 3.0 V | 0.4 ohm |
| On-Resistance at 1.8 V | 0.55 ohm |
| On-Resistance Matching Between Channels | 0.12 ohm |
| On-Resistance Flatness Across Signal Range | 0.056 ohm |
| Single Supply Voltage Range | 1.6 V to 3.6 V |
| Power Consumption | <0.2 microwatt |
| Turn-On Time at 3 V | 16 ns |
| Turn-Off Time at 3 V | 13 ns |
| Off-Leakage Current at 3.3 V and 25C | 4 nA maximum |
| Off-Leakage Current at 3.3 V and 85C | 40 nA maximum |
| Logic Compatibility | 1.8 V-compatible digital inputs with a single 3 V supply |
| Signal Handling | Rail-to-rail analog signals |
| Switching Guarantee | Guaranteed break-before-make |
| Inhibit Function | Simultaneously opens all signal paths |
| 封裝 | 16-pin thin QFN, 3 x 3 mm |
| 安裝類型 | Surface mount |
| RoHS 狀態 | Compliant |
ISL84781IR 16-pin thin qfn, 3 x 3 mm 腳位配置指南
ISL84781IR（16-pin thin qfn, 3 x 3 mm 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： ISL84781IR.
請參閱 資料表 以查看完整腳位配置。
典型應用
ISL84781IR 適用於 6 應用s: Battery-Powered Sensor Multiplexing, Precision Test and Measurement, Communications Signal Routing, Industrial Data Acquisition, Wearable Health Device Front End, Programmable Gain and Feedback Network.
Battery-Powered Sensor Multiplexing
The Renesas Electronics ISL84781IR fits low-voltage sensor-hub designs that must route eight analog inputs through one shared converter or measurement channel. Its 1.6 V to 3.6 V single-supply range supports systems powered from a regulated low-voltage battery rail, while the 0.55 ohm on-resistance at 1.8 V limits insertion loss for moderately low-impedance sensors. Low off-leakage, specified at 4 nA maximum at 25C with a 3.3 V supply, helps prevent inactive channels from loading high-impedance outputs. The inhibit function can isolate all eight paths during calibration or when the shared measurement resource is unavailable.
推薦
Precision Test and Measurement
The ISL84781IR is appropriate for compact test and measurement equipment that selects among multiple low-voltage analog sources. With 16 ns turn-on and 13 ns turn-off time at a 3 V supply, the multiplexer supports fast source selection, while guaranteed break-before-make operation helps prevent an unwanted transient during address transitions. Its 0.4 ohm on-resistance at 3.0 V limits voltage loss in precision divider and buffer arrangements. The 3 x 3 mm 16-pin TQFN package also conserves board area in multi-channel instruments where analog routing density is important.
推薦
Communications Signal Routing
The ISL84781IR can route low-voltage communication and control signals in compact communications equipment that uses a single 1.6 V to 3.6 V rail. Its low on-resistance and 0.056 ohm flatness across the signal range help reduce channel-dependent attenuation, while 1.8 V-compatible digital inputs simplify control from low-voltage logic. The inhibit pin provides a practical isolation mechanism during reset, firmware update, or diagnostic states. Layout must still keep the muxed analog paths away from high-speed digital clocks and switching-node edges to avoid added noise or crosstalk.
推薦
Industrial Data Acquisition
The ISL84781IR supports dense industrial data-acquisition boards by selecting one of eight low-voltage analog inputs for a shared amplifier or ADC. The low 0.4 ohm on-resistance at a 3.0 V supply helps preserve signal integrity when the selected source drives a higher-impedance acquisition stage. Fast 16 ns turn-on time allows the controller to scan channels quickly, and the inhibit input can place the analog network into a known open state during maintenance or calibration. Industrial designs should pay particular attention to grounding, connector protection, and keeping high-energy switching paths physically separated from the multiplexed inputs.
推薦
Wearable Health Device Front End
The ISL84781IR is suitable for compact wearable health devices that combine several low-voltage analog sensor inputs with a shared analog front end. Operation from 1.6 V to 3.6 V aligns with low-voltage wearable rails, and power consumption below 0.2 microwatt as stated by the manufacturer helps limit energy use. The low-leakage behavior reduces loading of high-impedance bio-sensor or resistive sensor networks when their channels are not selected. Because these applications are sensitive to user safety and diagnostic accuracy, the final design should validate isolation, fault behavior, and electrode protection independently of the multiplexer specification.
推薦
Programmable Gain and Feedback Network
The ISL84781IR can select among multiple feedback or programmable-gain networks when a system requires rapid analog-path changes under digital control. Its 16 ns turn-on and 13 ns turn-off performance at a 3 V supply supports short selection intervals, while the guaranteed break-before-make characteristic helps avoid connecting two feedback branches simultaneously. The 0.12 ohm channel-matching specification reduces mismatch between successive measurements. Engineers should verify that the selected network remains within the absolute input and output limits of the device and that the inhibit state leaves the surrounding amplifier in a safe, defined condition.
推薦
推薦產品摘要
工程參考資料，適用於 ISL84781IR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ISL84781IRZ | MAX4781ETE+T | MAX4617 |
|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Analog Devices | Analog Devices |
| Multiplexer Configuration | 8:1 analog multiplexer | 8:1 analog multiplexer | 8:1 analog multiplexer | 8:1 analog multiplexer |
主要差異化特點
- Very low on-resistance for a low-voltage 8:1 multiplexer (對比MAX4781ETE+T)
- Fast 16 ns turn-on and 13 ns turn-off operation (對比MAX4617)
- Low-voltage operation with 1.8 V-compatible control inputs (對比MAX4781ETE+T)
- Known manufacturer cross-reference relationship (對比MAX4617)
設計說明
Place the ISL84781IR close to the source of the eight analog inputs and the destination of the common output. Keep each routed channel short and continuous to minimize parasitic capacitance and sensitivity to adjacent switching nodes. Follow the exposed-pad and land-pattern requirements in the manufacturer package drawing. For the 3 x 3 mm TQFN construction, verify solder mask, paste, and reflow recommendations against the current assembly process before release to production.
Route the selected analog signal away from digital address and control traces, especially the inhibit net. Maintain a continuous ground reference beneath the signal path where practical, and avoid sharing narrow copper regions with high-current return paths. The manufacturer specifies 0.4 ohm on-resistance at 3.0 V and 16 ns turn-on time, so the device can switch quickly; good physical separation helps prevent that speed from coupling into the selected channel.
Do not assume that an 8-to-1 pin function is compatible solely because the pin count matches. Verify address-input truth tables, inhibit polarity, supply sequencing, exposed-pad connection, and signal-direction limitations using the manufacturer pin table. The manufacturer identifies guaranteed break-before-make operation, which should not be replaced with software assumptions about non-overlap timing. Also confirm that every driven node remains inside the absolute maximum ratings at startup and fault conditions.
合規資訊
The datasheet PDF states that Intersil Pb-free products use RoHS-compliant material sets and a 100% matte tin termination finish compatible with SnPb and Pb-free soldering operations. No separate REACH, halogen-free, or conflict-minerals statement was identified.
