DG211DJ+ - Quad SPST CMOS Analog Switch | Analog Devices
MPN： DG211DJ+ ✓ 啟用中DG211DJ+ 概覽
An analog switch is an electronically controlled semiconductor device that routes signals between circuit nodes without continuously conducting them. The DG211 belongs to the analog-switch and multiplexer hierarchy, where CMOS implementations combine low signal distortion with TTL-compatible control inputs. Each DG211 switch is normally closed, meaning its default connection remains active until the corresponding control input changes state. This behavior is useful for signal routing, test-point isolation, fallback paths, and analog measurement systems.
The DG211’s four SPST channels provide independent control of four signal paths. Its 175-ohm on-resistance is the principal signal-path parameter identified for the device, while the ±4.5 V to ±18 V supply range allows operation with positive and negative analog rails. The manufacturer also specifies break-before-make behavior, helping prevent two switched paths from momentarily connecting together during control transitions. The DG211DJ+ ordering code places this quad switch in a 16-pin PDIP package.
CMOS construction gives the DG211 low static power characteristics relative to many mechanical or bipolar relay alternatives. Because the device uses MOSFET-based switching elements, its on-state behavior changes with signal amplitude and supply configuration. Designers should therefore evaluate resistance, off leakage, charge injection, capacitance, and logic thresholds against the particular source and load impedance. The fast transition and low on-resistance make the device practical for precision test systems, data-acquisition front ends, instrumentation, and controlled analog paths.
Typical uses include switching sensor outputs into measurement amplifiers, isolating channels in automated test equipment, selecting signal sources in laboratory instruments, and preserving analog connections during power-up or fault conditions. The normally closed topology is especially valuable when a default connection must remain intact if control logic is unpowered or temporarily unavailable. The 16-pin PDIP package is appropriate for through-hole assembly, prototypes, educational systems, and designs where a socketed DIP implementation simplifies maintenance.
Designers should preserve the recommended supply and signal limits, place bypass capacitance close to the supply pins, and use pull resistors where control inputs may float during reset. The break-before-make and latch-up characteristics improve transition reliability, but external logic still must not exceed the input ratings. Because analog-switch performance depends on source impedance, load impedance, frequency, and supply voltage, prototype measurements should verify bandwidth and distortion before high-volume deployment.
This product record combines the manufacturer’s production status, switch topology, resistance, supply range, package information, ordering data, and drop-in comparison guidance with practical PCB, signal-integrity, and selection considerations. It is intended to help engineers identify whether the DG211DJ+ matches the required electrical behavior, normally closed routing, through-hole footprint, and control architecture before placing the part into a production design.
直接替換替代品，適用於 DG211DJ+ — 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。
DG211DJ
✅ 直接替換📋 參考替代品（不在目錄中）
DG211DJ+ 最大額定值與電氣特性
| Number of Switches | 4 circuits |
| Switch Configuration | 1:1 SPST |
| Switch State | Normally closed (NC) |
| On-Resistance | 175 ohm |
| Supply Voltage Range | ±4.5 V to ±18 V |
| Switching Behavior | Break-before-make |
| Technology | CMOS |
| 封裝 | 16-pin PDIP |
| 安裝類型 | Through-hole |
| 腳位數 | 16 pins |
| Production Status | Production |
| Latch-Up Protection | Guaranteed when supplies are disconnected with input signals still connected |
DG211DJ+ 16-pin pdip 腳位配置指南
DG211DJ+（16-pin pdip 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： DG211DJ+.
請參閱 資料表 以查看完整腳位配置。
典型應用
DG211DJ+ 適用於 6 應用s: Automated Test Fixture Signal Routing, Precision Instrumentation Signal Isolation, Data-Acquisition Front End, Audio Path Switching, Power-Sequencing Signal Isolation, Industrial Control and Sensor Interfacing.
Automated Test Fixture Signal Routing
The DG211DJ+ fits automated test fixtures where four normally closed paths must preserve a default connection until the test controller selects another route. Its 175-ohm on-resistance is suitable for many medium-impedance analog measurements, while break-before-make behavior helps prevent two driven sources from overlapping during a transition. The four independent SPST channels reduce the number of discrete relays required, and latch-up protection adds resilience when fixture power is removed before external test signals. Engineers should still check leakage, capacitance, and injection against the measurement accuracy required by the fixture.
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Precision Instrumentation Signal Isolation
The DG211DJ+ is useful for isolating instrument channels and protecting sensitive front ends from unwanted test or routing signals. Its normally closed configuration maintains the selected path during reset or controller inactivity, while the 175-ohm resistance adds a defined impedance to the signal path. Operating rails from ±4.5 V to ±18 V permit use in bipolar measurement systems. The principal design check is whether switch capacitance, off leakage, and on-resistance are low enough for the source impedance and required measurement bandwidth.
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Data-Acquisition Front End
The DG211DJ+ can route sensor or source signals into a data-acquisition front end when each channel requires an independently controlled, normally closed connection. Four SPST switches provide compact channel management in a 16-pin PDIP package, and the 175-ohm on-resistance is appropriate for many medium-impedance sensors. Break-before-make behavior helps keep the previous and next paths separated during switching. High-impedance sensors may require a lower-resistance switch, so engineers should evaluate leakage and input impedance before finalizing the front end.
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Audio Path Switching
The DG211DJ+ can provide default-on switching in audio and communication paths where a signal should remain connected during reset. Its four normally closed channels permit parallel routing or isolation of several lines, and the 175-ohm on-resistance is suitable for many line-level inputs when the downstream impedance is substantially higher. Negative and positive supply support allows bipolar routing. Designers should verify distortion, bandwidth, off leakage, and channel capacitance against the audio specification, particularly for high-fidelity or microphone-level circuits.
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Power-Sequencing Signal Isolation
The DG211DJ+ fits signal-isolation tasks during power sequencing because its normally closed paths preserve the default connection while the controller is reset or supplies are changing. Latch-up protection addresses the condition in which the switch supplies are disconnected while input signals remain connected. This behavior helps avoid unintended active states in system interconnect networks. Designers should coordinate control states with the power rails and confirm that every switched voltage remains within the specified input and absolute maximum limits.
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Industrial Control and Sensor Interfacing
The DG211DJ+ can switch several sensor or actuator interface lines within industrial control equipment while retaining a defined connection during controller reset. Its four-channel normally closed topology consolidates routing functions, and its 16-pin PDIP package supports conventional through-hole assembly. The ±4.5 V to ±18 V supply range is suitable for systems using bipolar analog signals. For safety-related or harsh industrial use, confirm the exact temperature grade, isolation strategy, and compliance status rather than inferring suitability from the family name alone.
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推薦產品摘要
工程參考資料，適用於 DG211DJ+ — 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 | DG211DJ |
|---|---|---|
| Brand | Analog Devices | Analog Devices |
| Package | 16-pin PDIP | 16-pin PDIP |
| Number of Switches | 4 circuits | 4 circuits |
| Switch Configuration | 1:1 SPST | 1:1 SPST |
| Default State | Normally closed | Normally closed |
| On-Resistance | 175 ohm | 175 ohm |
| Supply Voltage Range | ±4.5 V to ±18 V | ±4.5 V to ±18 V |
| Switching Behavior | Break-before-make | Break-before-make |
| Technology | CMOS | CMOS |
主要差異化特點
- Default-on signal continuity (對比DG211DJ)
- Identical on-resistance (對比DG211DJ)
- Matching bipolar operating range (對比DG211DJ)
- Mechanical interchangeability (對比DG211DJ)
設計說明
Place the device so that switched analog paths remain away from digital control traces and switching-node currents. Keep each connection short and use a continuous ground reference where possible; the 16-pin PDIP footprint provides ample routing space, but signal-loop area should still be minimized. Orient the package according to the pin-1 marking shown in the manufacturer data sheet rather than relying only on the PCB silkscreen.
The 175-ohm on-resistance forms a divider with the source and load impedances, so evaluate insertion loss using the complete signal path rather than the switch alone. At high frequencies, include the switch’s capacitance and the receiving circuit’s input capacitance. For high-impedance sensors, check off leakage because even a small parasitic current can create a significant output-voltage error.
Do not assume that the ±4.5 V to ±18 V supply range defines the permissible input-signal range. Check the common-mode, overvoltage, and absolute maximum limits in the manufacturer data sheet. Also avoid floating control inputs: use suitable pull resistors or drive every control line from a defined reset state so the normally closed paths do not change unexpectedly during startup.
Use the supply bypassing recommended by the manufacturer and place each decoupling capacitor close to its associated supply pins. Keep return currents out of sensitive analog paths, especially when controlling several switches simultaneously. Although the DG211 is a CMOS analog switch, its supply currents and dynamic behavior still depend on the control state and signal levels, so validate the power budget under worst-case switching conditions.
合規資訊
The exact ordering-code environmental and qualification documents were not identified in the manufacturer product-page content. The DG211 is an analog interface IC rather than an automotive-qualified device, so AEC-Q100 is recorded as not applicable. Confirm RoHS, REACH, lead-free, halogen-free, and conflict-minerals documentation for the exact DG211DJ+ orderable configuration before regulatory submission.