DG212CJ+ - Quad SPST CMOS Analog Switch | Intersil
MPN： DG212CJ+ ✓ 啟用中DG212CJ+ 概覽
An analog switch is an integrated interface device that routes analog signals between external circuit nodes under digital control. The DG212CJ+ belongs to the CMOS analog-switch hierarchy, where each SPST channel provides one signal path with a normally open configuration. Its inverted control inputs allow the device to be selected by active-high or active-low system logic, while four independent switches can share common supply rails within one package.
Key features include a 175 ohm maximum on resistance, a maximum turn-on time of 1000 ns, and a maximum turn-off time of 500 ns. The device is specified for a wide dual-supply range of ±4.5 V to ±18 V. According to the Analog Devices DG212 product page, the DG202 and DG212 family is guaranteed not to latch up when the power supplies are disconnected while input signals remain connected, improving recovery behavior in systems where rails can be removed before external circuitry.
The DG212 family differs from the DG201 and DG211 families through its inverted control inputs. Within the DG202 family, the DG212 provides four normally open SPST channels, making it appropriate for signal isolation, test-point routing, programmable front ends, and general-purpose switching rather than fixed on-state multiplexing. Its CMOS implementation and simple logic interface suit compact analog and digital control systems where channel isolation and predictable switching timing are important.
Typical uses include communication-system signal routing, process-control interfaces, disk-drive electronics, test equipment, sample-and-hold circuits, and computer peripherals. Engineers should pay attention to the inverted logic polarity and confirm that a low control level closes each normally open channel. Because this is a 16-pin PDIP device rather than a surface-mount package, it is most appropriate for through-hole legacy, industrial, instrument, and prototype designs where DIP availability is more valuable than compact placement.
For reliable operation, use the pin-description table and recommended operating conditions in the manufacturer datasheet when assigning control and analog pins. Confirm signal levels against the applicable supply configuration and avoid exceeding ±18 V. This page combines manufacturer specifications, sourcing context, pin-usage guidance, and verified drop-in replacement information to support practical selection and board-level implementation.
直接替換替代品，適用於 DG212CJ+ — 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。
DG212CJ-2
✅ 直接替換📋 參考替代品（不在目錄中）
DG212CJ+ 最大額定值與電氣特性
| Number of Channels | 4 channels |
| Switch Configuration | 4 x SPST |
| Initial Switch State | Normally open |
| On Resistance | 175 ohm maximum |
| Dual Supply Voltage Range | ±4.5 V to ±18 V |
| Turn-On Time | 1000 ns maximum |
| Turn-Off Time | 500 ns maximum |
| Control Input Type | Inverted digital control inputs |
| Signal-to-Noise Ratio | 120 dB typical |
| Off Isolation | -60 dB typical at 1 MHz |
| Channel-to-Channel Match | 5 ohm typical |
| 封裝 | 16-pin PDIP |
| 安裝類型 | Through-hole |
| Process Technology | CMOS monolithic |
DG212CJ+ 16-pin pdip 腳位配置指南
DG212CJ+（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： DG212CJ+.
請參閱 資料表 以查看完整腳位配置。
典型應用
DG212CJ+ 適用於 6 應用s: Process-Control Signal Routing, Communications Signal Switching, Disk-Drive Electronics, Test and Measurement Systems, Sample-and-Hold Circuits, Computer Peripheral Interfacing.
Process-Control Signal Routing
The DG212CJ+ is suitable for routing process-control signals among sensors, amplifiers, and controller inputs because it provides four independent normally open SPST paths with inverted control inputs. Its 175 ohm maximum on resistance is reasonable for moderate-impedance equipment signals, while 1000 ns maximum turn-on time and 500 ns maximum turn-off time support controlled multiplexer or isolation functions. The device can operate with dual supplies from ±4.5 V to ±18 V, allowing it to sit between bipolar instrumentation and a digital controller. Designers should confirm that the switched signal remains within the input range at both supply rails and that the inverted control convention matches the controller firmware.
推薦
Communications Signal Switching
The DG212CJ+ can route communication signals through four independently controlled CMOS analog switches when the system needs general-purpose 1:1 connectivity rather than a multiplexed channel architecture. The normally open configuration isolates paths until the corresponding inverted control input is asserted, and the 175 ohm maximum on resistance limits insertion loss to 175 ohm in the closed state. With a ±4.5 V to ±18 V dual-supply range, the device can support bipolar interface signals. Engineers should verify bandwidth, insertion loss, and off-impedance requirements against the complete signal path because the documented excerpts do not specify every frequency-dependent characteristic.
推薦
Disk-Drive Electronics
The DG212CJ+ fits legacy disk-drive electronics where multiple signal paths must be isolated or connected under digital control. Its four normally open SPST channels permit independent routing, while the simple inverted logic interface can be driven by host or controller logic without a complex sequencing circuit. The maximum turn-on and turn-off times are 1000 ns and 500 ns, respectively, which must be compatible with the drive's write, read, and head-selection timing. The 16-pin PDIP format is advantageous for older through-hole electronics and repair platforms, although it is larger than modern surface-mount switch packages.
推薦
Test and Measurement Systems
The DG212CJ+ can connect test sources, returns, and instrument inputs through four separately controlled channels in legacy automated test equipment. The four 1:1 normally open switches support isolation between measurement paths, and their 175 ohm maximum on resistance is a key consideration for high-impedance instrumentation. Timing limits of 1000 ns maximum turn-on and 500 ns maximum turn-off should be included in the test-system settling budget. Because the package is a through-hole 16-pin PDIP, it also fits older instrument and fixture architectures where DIP socketed replacement is preferable to a surface-mount redesign.
推薦
Sample-and-Hold Circuits
The DG212CJ+ can serve as the routing element in sample-and-hold systems that require a normally open connection between a source and a holding or acquisition circuit. Its four channels allow multiple signals to be selected independently, and the 500 ns maximum turn-off time plus 1000 ns maximum turn-on time provide concrete timing limits for acquisition sequencing. The 175 ohm on resistance contributes directly to source loading and should be compared with the sampling capacitor and amplifier input network. Designers should also account for charge injection and hold-settling requirements beyond the documented basic switch timing.
推薦
Computer Peripheral Interfacing
The DG212CJ+ is appropriate for computer peripheral and legacy interface boards that need four controllable analog paths for input selection, signal isolation, or peripheral connection. The normally open SPST configuration prevents unintended path closure during reset or power transitions, and the inverted controls can be coordinated by common digital logic. The wide ±4.5 V to ±18 V dual-supply range permits operation in bipolar peripheral systems, while the 175 ohm maximum on resistance should be acceptable only when the receiving inputs have sufficiently high impedance. For new compact designs, verify whether DIP footprint availability is more valuable than board area.
推薦
推薦產品摘要
工程參考資料，適用於 DG212CJ+ — 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 | DG212CJ-2 |
|---|---|---|
| Brand | Intersil Corporation | Analog Devices |
| Package | 16-pin PDIP | 16-pin PDIP - same footprint |
| Number of Channels | 4 channels | 4 channels |
| Switch Configuration | 4 x SPST | 4 x SPST |
| Initial State | Normally open | Normally open |
| On Resistance | 175 ohm maximum | 175 ohm maximum |
| Dual Supply Voltage Range | ±4.5 V to ±18 V | ±4.5 V to ±18 V |
| Turn-On Time | 1000 ns maximum | 1000 ns maximum |
| Turn-Off Time | 500 ns maximum | 500 ns maximum |
| Control Polarity | Inverted control inputs | Inverted control inputs |
主要差異化特點
- Exact documented drop-in replacement (對比DG212CJ-2)
- Four independent normally open signal paths (對比DG212CJ-2)
- Wide bipolar operating range (對比DG212CJ-2)
設計說明
Confirm the inverted control-input polarity in the manufacturer logic table before assigning a control net. A low-to-high or high-to-low transition at the controller may appear to operate all four channels correctly while actually selecting the opposite state. Use the pin-description table to distinguish each normally open channel from its associated control input, and include this inversion in firmware and schematic review.
Treat the 175 ohm maximum on resistance as part of the complete source impedance. Together with switch capacitance, connector resistance, and the receiving amplifier's input impedance, it determines attenuation and settling behavior. For precision or high-impedance measurement paths, calculate the total effective impedance and verify that the source, switch, and input network meet the required transfer function before layout release.
Operate the DG212CJ+ within the documented ±4.5 V to ±18 V dual-supply range and account for signal amplitude when selecting rail values. The device is guaranteed not to latch up if power supplies are disconnected while input signals remain connected, but protection does not remove the need to control signal amplitude or prevent illegal logic states. Verify absolute maximum conditions and power-sequencing behavior in the manufacturer datasheet.
Assign analog signal and inverted-control pins directly from the manufacturer package drawing, and keep analog routing away from high-current switching nodes. Although the 16-pin PDIP offers generous lead spacing, long parallel traces can couple switching transients into high-impedance analog paths. Use a common ground reference, minimize loop area, and place optional bypass components near the supply pins according to the recommended application circuit.
合規資訊
No specific RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations were identified for this exact ordering code. AEC-Q100 is not applicable because DG212CJ+ is not presented as an automotive-qualified ordering variant.