ISL84544CB - Dual SPST 60Ω Analog Switch | Renesas
MPN： ISL84544CB ✓ 啟用中ISL84544CB 概覽
An analog switch is an electrically controlled semiconductor that connects or disconnects analog signal paths while preserving the selected voltage. The ISL84544CB belongs to the analog switch and multiplexer hierarchy within interface ICs and semiconductor signal-routing systems. Its single-supply operation supports both 3.3 V and 5 V equipment, while its dual SPST arrangement can form a 2:1 analog multiplexer for selecting between two signal sources.
According to the Renesas product information, key advantages include fully specified operation at 3.3 V and 5 V, on-resistance matching between channels below 1 ohm, maximum charge injection of 5 pC, and power consumption below 5 microwatts. Switching times are listed as 35 ns for turn-on and 25 ns for turn-off. The device also provides guaranteed break-before-make behavior and minimum 2,000 V ESD protection, which are important for preventing momentary input overlap.
The ISL84544 family is designed for precision, low-voltage analog routing. Its low power dissipation reduces loading in portable systems, and its low charge injection limits command-induced voltage disturbances in measurement and signal-conditioning circuits. The matching between channel on-resistances is particularly useful when both selected paths must present similar impedance to a following amplifier, ADC, or sensor interface.
Typical applications include battery-powered instrumentation, data-acquisition front ends, test and measurement equipment, communications interfaces, and precision sensor multiplexing. The dual SPST topology is particularly useful when two inputs must share one downstream converter or amplifier. It can also be used for sample-and-hold or signal-isolation functions when the control timing and break-before-make requirement are properly observed.
Designers should account for input and output signal amplitudes, control-logic levels, switch on-resistance, and off leakage when defining the system bandwidth. Keep sensitive routing paths short, use a defined control state during power transitions, and verify that the 2:1 configuration matches the intended schematic rather than assuming a conventional dual-SPDT pinout. The manufacturer datasheet pin-description table should be used for final PCB routing and logic assignment.
This product page combines the Renesas family specifications with package-level selection guidance, same-footprint alternatives, parameter comparisons, and practical implementation notes. These resources help engineers distinguish drop-in options from functionally similar devices and identify the electrical conditions that determine whether the ISL84544CB is suitable for a specific analog-routing design.
直接替換替代品，適用於 ISL84544CB — 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。
此系列的變體
與下列產品可直接替換的同系列型號： ISL84544CB （相同外形與佔位） — 差異在於 Package, Supply Voltage Range.
ISL84544CBZ
✅ 直接替換📋 參考替代品（不在目錄中）
ISL84544IBZ
✅ 直接替換📋 參考替代品（不在目錄中）
MAX4544ESA+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX3232EIPWG4
✅ 直接替換聯絡詢價
查看資料表 →MAX32550-LCS+T
✅ 直接替換聯絡詢價
查看資料表 →DG9461
✅ 直接替換📋 參考替代品（不在目錄中）
DG9262
✅ 直接替換📋 參考替代品（不在目錄中）
DG9263
✅ 直接替換📋 參考替代品（不在目錄中）
ISL84544CB 最大額定值與電氣特性
| Device Type | 1 Circuit IC Switch, 2:1 Multiplexer |
| Switch Configuration | Dual SPST |
| Number of Channels | 2 channels |
| Number of Switches | 1 switch |
| Supply Voltage Range | +2.7 V to +12 V |
| On-Resistance | 60 ohm |
| On-Resistance Matching Between Channels | <1 ohm |
| Charge Injection | 5 pC maximum |
| Power Consumption | <5 uW |
| Leakage Current | 10 nA maximum at 85 °C |
| Turn-On Time | 35 ns |
| Turn-Off Time | 25 ns |
| Break-Before-Make | Guaranteed |
| ESD Protection | 2,000 V minimum |
| 封裝 | 8-pin SOIC |
| 安裝類型 | Surface Mount |
| Specified Supply Conditions | 3.3 V and 5 V |
| Pb-Free Availability | Available as an option |
ISL84544CB 8-pin soic 腳位配置指南
ISL84544CB（8-pin soic 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： ISL84544CB.
請參閱 資料表 以查看完整腳位配置。
典型應用
ISL84544CB 適用於 6 應用s: Battery-Powered Data Acquisition, Precision Sensor Multiplexing, Test and Measurement Routing, Communications Signal Routing, Audio Signal Selection, Industrial Control Signal Selection.
Battery-Powered Data Acquisition
The ISL84544CB fits battery-powered data-acquisition front ends that must select between two sensor or measurement channels while drawing very little power. Its single +2.7 V to +12 V supply range supports 3.3 V systems, and the listed power consumption below 5 microwatts reduces loading on compact batteries. The 2:1 configuration can route either input to a shared ADC channel, while the 60 ohm listed on-resistance should be included when calculating source impedance and acquisition bandwidth. The 35 ns turn-on and 25 ns turn-off times permit rapid channel selection, although system timing must respect guaranteed break-before-make operation.
推薦
Precision Sensor Multiplexing
The ISL84544CB is suitable for selecting one of two low-frequency sensor outputs before amplification or conversion. Its on-resistance matching below 1 ohm helps both paths present similar loading to the following circuit, while maximum charge injection of 5 pC limits voltage disturbance when the control state changes. The 10 nA maximum leakage at 85 °C is useful in high-impedance sensor circuits. Designers should still verify the actual signal amplitude, source impedance, settling time, and control-logic levels, particularly when the sensor output can remain above the selected supply rail.
推薦
Test and Measurement Routing
The ISL84544CB can route two test signals through a shared measurement path in compact instrumentation. Fast 35 ns turn-on and 25 ns turn-off characteristics reduce dead time during automated selection, and guaranteed break-before-make operation prevents the two sources from being connected together during a transition. Its 8-pin SOIC package supports conventional surface-mount assembly, while power consumption below 5 microwatts is advantageous in portable test equipment. The 60 ohm listed on-resistance must be considered when driving high-impedance inputs, and long PCB traces should be avoided to minimize added capacitance.
推薦
Communications Signal Routing
The ISL84544CB can support channel selection in low-voltage communications equipment where two analog paths feed a common downstream block. Operation from +2.7 V to +12 V supports both 3.3 V and 5 V system rails, while the low-power specification is useful in line-powered and portable equipment. The guaranteed break-before-make characteristic helps prevent source contention during state transitions. High-frequency designs require checking the switch capacitance and bandwidth against the trace and load impedances, because the stated 35 ns and 25 ns timing values do not by themselves define insertion loss.
推薦
Audio Signal Selection
The ISL84544CB can select between two audio or control signals before they enter a converter, provided the signal amplitudes and bandwidth remain within the switch's operating limits. Maximum charge injection of 5 pC helps reduce control-state transients, and less than 1 ohm on-resistance matching helps maintain similar channel impedance. The low 5 pC specification should be compared with the receiving circuit's sensitivity to glitches, and care is required when the source is high impedance. Firmware or hardware control must also honor break-before-make sequencing to avoid simultaneously connecting the two sources.
推薦
Industrial Control Signal Selection
The ISL84544CB is applicable to industrial control boards that must route one of two low-level analog signals to a shared controller input. Its +2.7 V to +12 V operating range supports common control rails, and its guaranteed minimum 2,000 V ESD protection adds device-level robustness around external interfaces. Low power consumption and an 8-pin SOIC package simplify compact control assemblies. Protection networks should still be designed for the board's actual ESD and surge environment, while control logic must maintain valid states during reset. The switch's 60 ohm listed on-resistance must be compared with the controller input impedance and required settling behavior.
推薦
推薦產品摘要
工程參考資料，適用於 ISL84544CB — 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 | ISL84544CBZ | ISL84544IBZ | MAX4544ESA+ | MAX323 | MAX325 |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Analog Devices | Analog Devices | Analog Devices |
主要差異化特點
- Broad single-supply operating range (對比MAX4544ESA+)
- Low switching disturbance (對比MAX323)
- Fast transition performance (對比MAX325)
- Low power and matched channel resistance (對比DG9461)
- Guaranteed transition sequencing (對比DG9262)
設計說明
Route the analog nodes as short and direct as practical, especially when the selected source has high impedance. Place the ISL84544CB near the connection between the two input sources and the shared downstream device so that PCB capacitance and leakage do not add materially to the source impedance. Follow the manufacturer land pattern for the 8-pin SOIC and preserve the pin orientation shown in the package drawing. Verify the exact pin functions against the datasheet rather than deriving them from a visually similar multiplexer.
Do not connect two externally driven signals simultaneously. Although the device is specified for 2:1 multiplexing and guarantees break-before-make, the control system must still issue a valid state during startup and reset. The 60 ohm listed on-resistance can reduce bandwidth when driving a high-impedance or capacitive load, and the 5 pC maximum charge injection can create a transient on a sensitive receiver. Include switch resistance and settling behavior in the signal-chain error budget.
For fast or low-impedance signals, evaluate the complete switch-plus-PCB path rather than using the 35 ns turn-on and 25 ns turn-off values as bandwidth specifications. Include switch capacitance, routing capacitance, source impedance, load impedance, and receiver input capacitance. Keep the common output path short and use a suitable return path to minimize coupling. If glitch energy is critical, place the switch where charge injection is less harmful or add filtering appropriate to the measured response.
Operate the ISL84544CB from a supply within +2.7 V to +12 V and ensure all switch and control voltages remain within their permitted limits. The low power consumption of less than 5 microwatts minimizes self-heating, but input and output signals must also remain within the device's analog operating range. Check upstream supply sequencing because an undefined control state during power ramp can create an unintended connection even if normal-state break-before-make behavior is guaranteed.
合規資訊
The manufacturer information states that a Pb-free option is available, but it does not explicitly establish the complete RoHS, REACH, AEC-Q100, halogen-free, or conflict-minerals status of this exact orderable MPN.