TS3A4741DCNR - 0.9Ω Dual SPST Analog Switch | TI SOT-23-8
料号： TS3A4741DCNR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.4 | $0.40 |
| 10 | $0.36 | $3.60 |
| 100 | $0.3 | $30.00 |
| 500 | $0.26 | $130.00 |
| 1,000 | $0.22 | $220.00 |
| 3,000 | $0.18 | $540.00 |
TS3A4741DCNR 概述
What is an SPST analog switch? An SPST (Single-Pole Single-Throw) analog switch is a solid-state semiconductor device that routes analog signals by electrically connecting or isolating one signal path. The TS3A4741 belongs to the broader category of analog switches and multiplexers, a subfamily of interface ICs used for signal routing in mixed-signal and low-power systems. Compared with mechanical relays, analog switches offer far faster switching speeds, lower power, smaller PCB area, and no mechanical bounce, at the cost of lower absolute voltage and current handling.
Key specifications include a 0.9 Ω typical on-resistance (Ron), 1.8 V CMOS-compatible digital logic inputs, rail-to-rail analog signal handling, very low quiescent current, and integrated ESD protection. The two switches operate completely independently, allowing them to be used as separate signal paths or as complementary paths in a single function.
The device is fabricated in a CMOS process and supports fast switching speeds, low off-leakage current, and bidirectional analog signal flow. Its small SOT-23-8 footprint and 1.8 V logic compatibility make it well suited to portable and battery-powered designs.
Typical applications include audio signal routing in portable devices, switching between two sensors in handheld instruments, power rail multiplexing in low-power systems, and general-purpose signal gating in test equipment and consumer electronics.
When designing with the TS3A4741, ensure the analog signal stays within the supply rails to avoid distortion or excessive leakage, and add 0.1 µF decoupling close to VCC. For applications requiring normally closed (NC) switches, use the pin-compatible TS3A4742.
This page synthesizes verified distributor pricing, same-brand and cross-brand drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： TS3A4741DCNR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： TS3A4741DCNR （相同外形与封装尺寸） ——差异在于 On-State Resistance (Ron), Operating Temperature, Package.
快速对比工具——选择替代料号进行并排对比：
TS3A4742DCNR
✅ 直接替换📋 参考替代料（不在目录中）
TS3A4741DCNT
✅ 直接替换📋 参考替代料（不在目录中）
TS3A4741DCNG4
✅ 直接替换📋 参考替代料（不在目录中）
TS3A4741DCNR 最大额定值与电气特性
| 功能 | Dual SPST analog switch (2x NO, 1:1) |
| Number of Channels | 2 |
| On-State Resistance (Ron) | 0.9 Ω (typical) |
| Switch Configuration | SPST - Normally Open (NO) |
| Supply Voltage (Single) | 1.65 V to 3.6 V |
| Logic Input Compatibility | 1.8 V CMOS |
| Analog Signal Range | Rail-to-rail |
| 工作温度 | -40 °C to +85 °C |
| 封装 | SOT-23-8 (DCN) |
| 安装类型 | Surface Mount |
| ESD Protection | Integrated (per TI datasheet) |
| RoHS 状态 | Compliant |
TS3A4741DCNR 引脚配置
| 引脚 1 | IN1 — Logic control input for switch 1 (1.8 V CMOS, active-high) |
| 引脚 2 | NO1 — Channel 1 normally-open terminal |
| 引脚 3 | COM1 — Channel 1 common terminal |
| 引脚 4 | GND — Ground |
| 引脚 5 | VCC — Supply voltage (1.65 V to 3.6 V) |
| 引脚 6 | COM2 — Channel 2 common terminal |
| 引脚 7 | NO2 — Channel 2 normally-open terminal |
| 引脚 8 | IN2 — Logic control input for switch 2 (1.8 V CMOS, active-high) |
典型应用
TS3A4741DCNR 适用于 6 应用s: Portable Audio Signal Routing, Sensor Multiplexing in Handheld Instruments, Battery Power Rail Switching, Test Equipment Signal Gating, Consumer Electronics Signal Routing, Communication Interface Signal Switching.
Portable Audio Signal Routing
The TS3A4741DCNR's 0.9 Ω Ron and rail-to-rail analog signal handling make it well-suited for routing stereo audio channels between the codec, headphone amplifier, and line-out jack in portable media players and smartphones. With 1.8 V CMOS-compatible logic and a 3 V single supply, it interfaces directly to baseband and application processors without level shifters. Its low on-resistance preserves audio dynamic range, while the independent NO switches let designers isolate unused paths to cut crosstalk. Compared to mechanical headphone-jack switches, the speakers cover the same routing function in a far smaller footprint with no mechanical wear over the product lifetime.
推荐
Sensor Multiplexing in Handheld Instruments
In handheld multimeters and environmental sensor modules, the TS3A4741DCNR can multiplex two sensor signals onto a single ADC input, saving analog front-end cost. The dual NO switches select which sensor feeds the ADC at any time, while the 1.8 V logic compatibility allows direct connection to a low-power microcontroller. The 0.9 Ω Ron contributes negligible offset error to bridge-style sensors such as load cells or thermocouple amplifiers, and the rail-to-rail signal range supports full-scale readings up to the supply rail. The small SOT-23-8 footprint preserves PCB real estate for battery and display.
推荐
Battery Power Rail Switching
The TS3A4741DCNR can switch between main battery and backup supercapacitor rails in ultra-low-power IoT nodes, isolating the backup supply until needed. With single 1.65 V to 3.6 V supply operation, the switch is compatible with single-cell Li-ion and two-cell alkaline chemistries. The very low quiescent current and low off-leakage help preserve battery life during sleep, while the 0.9 Ω Ron limits voltage drop to a few millivolts even at 100 mA loads. Independent NO control allows the system to pre-charge the backup rail through a controlled path before connecting it to the load.
推荐
Test Equipment Signal Gating
In bench-top instrumentation and ATE load boards, the TS3A4741DCNR serves as a low-leakage analog gate to insert or remove calibration resistors, reference voltages, or test signals into a measurement path. The 0.9 Ω Ron introduces only minor series resistance, and rail-to-rail operation preserves full-scale test coverage. Fast switching speeds enable rapid test sequencing, and the independent dual switches can be used to insert two separate calibration values in sequence. Because the device operates from a single supply and accepts 1.8 V logic, it integrates easily into FPGA- or MCU-controlled test fixtures.
推荐
Consumer Electronics Signal Routing
In consumer products such as digital cameras, wearables, and home appliances, the TS3A4741DCNR routes analog signals between functional blocks - for example, selecting between internal and external microphone paths, or switching between two LEDs in a fitness band. Its 0.9 Ω Ron and small SOT-23-8 footprint make it ideal for compact, cost-sensitive designs. The 1.8 V CMOS logic enables direct MCU control without additional glue logic, and rail-to-rail signal handling preserves signal amplitude. ESD protection built into the device improves ruggedness against user-accessible connector discharge events.
推荐
Communication Interface Signal Switching
The TS3A4741DCNR can switch low-speed analog or digital signal pairs in networking and communication modules, such as routing a UART or audio line between two sources, or selecting between primary and auxiliary antennas in sub-GHz radio modules. The 0.9 Ω Ron and rail-to-rail analog handling preserve signal integrity for low-frequency signaling. Its small SOT-23-8 package fits easily beside RF front-end modules, and the 1.8 V logic compatibility matches most modern baseband processors. The integrated ESD protection helps safeguard the downstream transceiver from cable-discharge events on user-facing ports.
推荐
推荐产品汇总
工程参考数据： TS3A4741DCNR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | TS3A4742DCNR | TS3A4741DCNT | TS3A4741DCNG4 | NX3DV42GU10X |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | NXP Semiconductors |
| Package | SOT-23-8 (DCN) | SOT-23-8 (DCN) - same | SOT-23-8 (DCN) - same | SOT-23-8 (DCN) - same | XQFN-10 (GU) - different |
| Number of Channels | 2 | 2 | 2 | 2 | 2 (DPDT) |
| Switch Configuration | SPST (NO) x2 | SPST (NC) x2 | SPST (NO) x2 | SPST (NO) x2 | DPDT x2 |
| Supply Voltage Range | 1.65 V to 3.6 V | 1.65 V to 3.6 V | 1.65 V to 3.6 V | 1.65 V to 3.6 V | 1.4 V to 4.3 V |
| Logic Compatibility | 1.8 V CMOS | 1.8 V CMOS | 1.8 V CMOS | 1.8 V CMOS | 1.8 V CMOS |
| Analog Signal Range | Rail-to-rail | Rail-to-rail | Rail-to-rail | Rail-to-rail | Rail-to-rail |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| RoHS Status | Compliant | Compliant | Compliant | Compliant | Compliant |
关键差异点
- Single-supply operation down to 1.65 V （对比 NX3DV42GU10X)
- Pin-compatible normally-closed variant available （对比 TS3A4742DCNR)
- 1.8 V CMOS logic compatibility on 3 V supply （对比 TS3A4741DCNT)
设计说明
Place a 0.1 µF decoupling capacitor as close as possible to the VCC pin (pin 5) and a 1 µF bulk capacitor nearby to keep the analog supply rail low-impedance during switching transients. According to the TI TS3A474x datasheet, the device draws very low quiescent current, but charge-injection events during switching can momentarily disturb VCC if decoupling is inadequate, leading to logic-input glitches on neighboring ICs.
Keep analog signal traces short and guarded to minimize capacitive coupling, since the TS3A4741's NO switches exhibit charge injection at turn-on. For low-frequency sensor or audio signals, add a small RC filter (e.g. 1 kΩ + 100 pF) at the COM pin to absorb the injected charge and reduce signal-spike amplitude. The device's rail-to-rail input range allows direct connection to signals near VCC or GND, but the analog signal must remain within the supply rails to prevent excessive distortion.
Do not drive the analog signal beyond VCC + 0.3 V or below GND - 0.3 V, as the ESD diodes will conduct and may damage the switch. Always confirm the logic high level (VIH) is met when driving IN1/IN2 from a microcontroller; on a 3 V supply, 1.8 V CMOS logic levels are supported, but on a 1.65 V supply the input threshold is lower. Estimated: with VCC = 3.3 V and a 100 mA load, the voltage drop across the 0.9 Ω Ron is approximately 90 mV - tolerable for most audio and sensor paths.
合规信息
RoHS compliant per Texas Instruments product page and DigiKey listing. Industrial temperature grade -40 °C to +85 °C; not AEC-Q100 qualified (consumer/industrial, not automotive).
