ADG431BRZ-REEL7 - Quad SPST 24Ohm Analog Switch | Analog Devices
MPN： ADG431BRZ-REEL7 ✓ 啟用中ADG431BRZ-REEL7 概覽
An analog switch IC is a semiconductor device that selectively connects or disconnects an analog signal path under digital control, replacing mechanical relays with faster, smaller, more reliable solid-state switching. Analog switches sit within the broader hierarchy of signal routing components: analog switch, multiplexer/demultiplexer, signal conditioning IC, and mixed-signal semiconductor. The ADG431 belongs to the ADG431/ADG432/ADG433 precision quad SPST family, which differs only in control-input logic polarity.
Key features include the 24 ohm maximum on-resistance with low on-resistance flatness, glitch-free switching that suppresses charge-injection transients during state changes, bidirectional signal capability, and an operating temperature range of -40C to +85C for industrial environments. The LC2MOS process merges CMOS logic with linear Bipolar-grade analog capability, delivering fast transition times with microamp-level quiescent power consumption, ideal for battery-operated and high-density designs.
Typical applications include audio and video signal routing, data acquisition channel selection, communication-system signal switching, and automated test equipment. Its low on-resistance minimizes insertion loss, while fast switching supports high channel-scan rates in multiplexed ADC front ends.
When designing with this part, account for on-resistance-induced attenuation in series with source impedance, and observe supply-voltage limits. Note the active-LOW control logic: if your firmware assumes active-HIGH switching, the ADG432 is the logic-compatible family alternative in the identical SOIC-16 pinout.
直接替換替代品，適用於 ADG431BRZ-REEL7 — 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。
ADG431BRZ
✅ 直接替換📋 參考替代品（不在目錄中）
ADG432BRZ
✅ 直接替換📋 參考替代品（不在目錄中）
ADG433BRZ
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
DG444CY+
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
DG445CY+
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ADG431BRZ-REEL7 最大額定值與電氣特性
| Switch Configuration | 4 x SPST (Normally Open, active-LOW control) |
| Number of Channels | 4 |
| On-Resistance (Max) | 24 ohm |
| Control Logic | Logic LOW turns switch ON |
| Signal Direction | Bidirectional |
| Switching Feature | Glitch-free switching |
| Process Technology | LC2MOS |
| 工作溫度 | -40C to +85C |
| 封裝 | 16-SOIC |
| 安裝類型 | Surface Mount |
| Packaging | Tape & Reel (REEL7) |
| RoHS 狀態 | Compliant |
| Grade | B grade (industrial) |
ADG431BRZ-REEL7 腳位配置
| 腳位 1 | VDD — Positive supply |
| 腳位 2 | VSS — Negative supply |
| 腳位 3 | IN1 — Switch 1 source/drain terminal (also GND reference per datasheet) |
| 腳位 4 | D1 — Switch 1 drain terminal |
| 腳位 5 | S1 — Switch 1 source terminal |
| 腳位 6 | D2 — Switch 2 drain terminal |
| 腳位 7 | S2 — Switch 2 source terminal |
| 腳位 8 | GND — Ground |
| 腳位 9 | S3 — Switch 3 source terminal |
| 腳位 10 | D3 — Switch 3 drain terminal |
| 腳位 11 | S4 — Switch 4 source terminal |
| 腳位 12 | D4 — Switch 4 drain terminal |
| 腳位 13 | IN4 — Logic control input 4 (LOW = ON) |
| 腳位 14 | IN3 — Logic control input 3 (LOW = ON) |
| 腳位 15 | IN2 — Logic control input 2 (LOW = ON) |
| 腳位 16 | IN1 — Logic control input 1 (LOW = ON) |
典型應用
ADG431BRZ-REEL7 適用於 6 應用s: Data Acquisition Channel Switching, Audio Signal Routing, Industrial Automation Signal Multiplexing, Test and Measurement Equipment, Communication Systems Switching, Battery-Powered Portable Devices.
Data Acquisition Channel Switching
In multiplexed data acquisition systems, the ADG431BRZ-REEL7 routes multiple sensor inputs to a shared ADC front end. Its 24 ohm maximum on-resistance keeps insertion loss low relative to typical source impedances, preserving measurement accuracy, while glitch-free switching prevents charge-injection artifacts from corrupting conversions during channel changes. The LC2MOS process provides fast switching for high scan rates and microamp-level power dissipation for portable loggers. Place each switch close to the ADC input with a short RC filter to settle the channel before the conversion clock; at 24 ohm Ron, allow adequate acquisition time for the source and capacitor network.
推薦
Audio Signal Routing
The ADG431BRZ-REEL7 suits audio path switching in mixers, preamplifiers, and professional audio equipment. Glitch-free switching on the LC2MOS process suppresses audible clicks when muting or changing signal paths, and bidirectional conduction lets the switch sit anywhere in the signal chain. The 24 ohm on-resistance is acceptable for line-level signals fed into high-impedance loads, where insertion loss remains below 0.1 dB. Keep DC offset across the switch near zero to minimize distortion, and drive control inputs with clean logic edges to avoid partial-on states that compress the audio signal.
推薦
Industrial Automation Signal Multiplexing
With a -40C to +85C industrial operating range, the ADG431BRZ-REEL7 reliably switches sensor and control signals in factory automation, PLC I/O cards, and process instrumentation. The B-grade screening supports industrial quality expectations, and CMOS inputs interface directly to standard logic controllers. Its low quiescent power aids dense multi-channel I/O modules with limited thermal budget. For long cable runs, place protection resistors ahead of the switch to clamp fault voltages within the absolute maximum ratings, and observe supply sequencing to keep control inputs within the valid logic window during power-up.
推薦
Test and Measurement Equipment
Bench instruments and automated test equipment use the ADG431BRZ-REEL7 to switch signal paths, select ranges, and multiplex probes. Fast switching on the LC2MOS process shortens relay-free scan times, improving throughput versus electromechanical alternatives, while the SOIC-16 package fits compact front-end boards. The 24 ohm Ron contributes predictably to signal-path error budgets and can be calibrated out. Avoid routing sensitive measurement nodes near switching control lines to prevent capacitive feedthrough, and verify settle time to your instrument accuracy band after each switch transition.
推薦
Communication Systems Switching
In wired communication and RF-receiver baseband paths, the ADG431BRZ-REEL7 performs transmit/receive and antenna-filter path selection at baseband frequencies. The CMOS switch conducts equally well in both directions, simplifying symmetric line switching, and low power dissipation suits always-on communication equipment. Keep signal swings within the supply rails to preserve switch linearity, and maintain a DC return path through the switch for bias networks. At the 24 ohm on-resistance, match source and load impedances to control flatness effects across the channel bandwidth.
推薦
Battery-Powered Portable Devices
The LC2MOS process of the ADG431BRZ-REEL7 provides very low static power dissipation, making it appropriate for battery-powered instruments that switch sensors, displays, or audio paths. CMOS control inputs draw negligible static current, so switch state changes do not burden the power budget, and glitch-free switching keeps user-facing transients inaudible or invisible. Size the supply rails to the signal swing required and use a logic-high level at the control pin to guarantee the OFF state, given the active-LOW control convention, so sleep-mode firmware defaults do not unintentionally enable switches.
推薦
推薦產品摘要
工程參考資料，適用於 ADG431BRZ-REEL7 — 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 | ADG431BRZ | ADG432BRZ | ADG433BRZ | DG444CY+ |
|---|---|---|---|---|---|
| Package | SOIC-16 | SOIC-16 - same | SOIC-16 - same | SOIC-16 - same | SOIC-16 - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices (Maxim heritage) |
| Control Logic | Active-LOW | Active-LOW | Active-HIGH | Mixed (2 LOW / 2 HIGH) | Active-LOW |
| Configuration | 4 x SPST-NO | 4 x SPST-NO | 4 x SPST-NO | 4 x SPST-NO | 4 x SPST-NO |
主要差異化特點
- Active-LOW control logic (對比ADG432BRZ)
- Uniform control polarity across all four switches (對比ADG433BRZ)
- LC2MOS glitch-free switching at 24 ohm Ron (對比DG444CY+)
設計說明
The 24 ohm on-resistance forms a divider with the source impedance. For a 600 ohm source, attenuation is about 3.8 percent; buffer high-impedance sources ahead of the switch, or place the switch into a virtual-ground node of an op-amp to minimize Ron-related gain error. Ron varies with signal voltage; in precision applications keep signal swing away from the supply rails where Ron rises.
The ADG431 control logic is active-LOW: a logic LOW turns each switch ON. Firmware written for active-HIGH switches will invert switch states. If inverting the logic is impractical, substitute the ADG432BRZ, which is pin-compatible with active-HIGH control in the same SOIC-16 package. Also ensure control inputs never exceed the supply rails, even transiently, to prevent CMOS latch-up.
Decouple VDD and VSS with 0.1 uF ceramic capacitors placed within a few millimeters of pins 1 and 2, with a solid ground plane connecting to the GND pin. Route analog signal traces away from control-input traces; control-edge coupling into the signal path appears as switching feedthrough. Keep switch-source/drain traces short and add a small RC (e.g., 100 ohm / 100 pF) at the ADC side for settling control in DAQ multiplexers.
合規資訊
RoHS compliant and lead-free per distributor listings (BRZ suffix). Not AEC-Q100 automotive qualified; B grade industrial device.
