DG442CJ+ - 85Ω Quad SPST Analog Switch | Maxim Integrated
MPN： DG442CJ+ ✓ 啟用中DG442CJ+ 概覽
An analog switch is an electronic routing component that connects or disconnects signal paths under digital control. A SPST switch provides one selectable path, while the DG442CJ+ combines four independent switches in one IC. The normally open configuration leaves each path disconnected until its control signal activates it. Within the interface-IC hierarchy, this device is a CMOS analog switch that bridges external analog circuitry and control logic.
The DG442CJ+ uses an 85Ω on-resistance and supports bidirectional operation. Maxim redesigned the DG441 and DG442 families to guarantee on-resistance matching of 4Ω maximum between switches and on-resistance flatness of 9Ω maximum over the signal range. These characteristics help reduce channel-to-channel error when several switched paths must present similar impedance to the source or load.
Switching timing includes approximately 170ns and 250ns figures identified for the device family, while the listed off-leakage is 500pA. These characteristics make the switch suitable for moderate-bandwidth analog paths, particularly where low leakage matters more than sub-nanosecond switching performance. The device is identified as a commercial-grade, through-hole part in a rectangular 16-pin PDIP package measuring approximately 0.300 inch wide, or 7.62mm.
Typical uses include test-equipment signal routing, precision measurement front ends, audio path selection, data acquisition systems, and industrial control interfaces. Four integrated switches reduce component count compared with four separate single-switch packages, while the parallel normally open structure simplifies channel isolation. The 85Ω impedance should be included in the source and load calculations because it can attenuate high-impedance signals and limit operation at higher frequencies.
PCB design should preserve short analog traces, provide a solid ground reference, and keep switching-node capacitance away from sensitive input paths. Because the device is a normally open SPST switch, evaluate whether break-before-make behavior satisfies the application’s interruption requirements. Use the manufacturer pin-description table and typical application circuits when assigning control signals and confirming the connection sequence.
This page combines package details, verified distributor records, drop-in replacement guidance, comparison parameters, and practical routing considerations to support faster component selection. It also distinguishes confirmed electrical and package facts from parameters that require confirmation in the manufacturer datasheet.
直接替換替代品，適用於 DG442CJ+ — 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： DG442CJ+ （相同外形與佔位） — 差異在於 Switch Configuration, Mounting Type, Package, Logic Compatibility, Number of Channels.
DG442DJ-E3
✅ 直接替換📋 參考替代品（不在目錄中）
DG442DJ+
✅ 直接替換聯絡詢價
查看資料表 →MAX362CPE+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX362EPE
✅ 直接替換📋 參考替代品（不在目錄中）
DG442DY-E3
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
DG442CJ+ 最大額定值與電氣特性
| Number of Circuits | 4 circuits |
| Switch Configuration | 1:1 SPST |
| Contact State | Normally open |
| On-Resistance | 85 ohm |
| On-Resistance Matching | 4 ohm maximum between switches |
| On-Resistance Flatness | 9 ohm maximum over the signal range |
| Signal Conduction | Bidirectional |
| Switching Behavior | Break-before-make |
| Off-Leakage Current | 500 pA |
| Switching Time | 170 ns and 250 ns |
| Technology | CMOS |
| 供應電壓 | 15 V maximum |
| 腳位數 | 16 pins |
| 封裝 | 16-PDIP |
| Package Width | 7.62 mm (0.300 inch) |
| 安裝類型 | Through hole |
| Temperature Grade | Commercial grade |
| RoHS 狀態 | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | not_applicable |
DG442CJ+ 7.62 mm (0.300 inch) 腳位配置指南
DG442CJ+（7.62 mm (0.300 inch) 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： DG442CJ+.
請參閱 資料表 以查看完整腳位配置。
典型應用
DG442CJ+ 適用於 6 應用s: Data Acquisition Multiplexing, Precision Test and Measurement, Audio Signal Routing, Industrial Control Signal Isolation, Sample-and-Hold Signal Selection, Interface Signal Multiplexing.
Data Acquisition Multiplexing
The DG442CJ+ fits a four-channel data-acquisition multiplexer because it combines four normally open SPST paths in one 16-PDIP package. Its 85Ω on-resistance adds a predictable series impedance, while the 4Ω maximum matching between switches helps limit channel-dependent gain variation. A controller can select one sensor or test node at a time, reducing external switching hardware and board area. The approximately 170ns and 250ns switching-time figures must be included in the acquisition settling budget, and the 500pA off-leakage value should be checked against high-impedance sensor requirements.
推薦
Precision Test and Measurement
The DG442CJ+ is useful for routing instrument signals among DUT pins, reference nodes, and measurement inputs. The four SPST channels provide isolated, normally open paths, while 85Ω on-resistance and 4Ω maximum matching make the switch suitable when channel impedance consistency matters. Its bidirectional conduction allows either source or measurement direction. Because the switch is not a zero-impedance relay, precision applications should include the 85Ω path resistance, leakage, and switching transients in the uncertainty budget, and should verify the manufacturer’s recommended settling and grounding practices.
推薦
Audio Signal Routing
The DG442CJ+ can route audio signals through four normally open analog paths when the 85Ω impedance and approximately 170ns to 250ns transition times are acceptable. Bidirectional conduction supports source-to-destination routing in either direction, and the four integrated switches reduce the footprint compared with separate single-switch devices. For audio designs, keep routing traces short, maintain a continuous ground reference, and confirm distortion, off-leakage, and off-impedance requirements in the complete manufacturer electrical table. The switch should normally be positioned near the source or destination rather than beside noisy switching circuitry.
推薦
Industrial Control Signal Isolation
The DG442CJ+ is appropriate for isolating or selecting low-voltage control signals in industrial equipment when four independent SPST channels are useful. Its normally open contacts prevent unintended path closure before control, while break-before-make operation protects against direct signal-path overlap during transitions. The 85Ω on-resistance should be included when driving a high-impedance input or control network. Keep the analog routing section physically separated from motor, relay, and power-converter switching nodes to prevent coupling, and verify the device’s control logic thresholds and supply limits before tying it to a particular industrial controller.
推薦
Sample-and-Hold Signal Selection
The DG442CJ+ can select among several analog inputs in a simple sample-and-hold front end because each SPST path provides a normally open connection to a common downstream node. The 85Ω switch resistance contributes to the source impedance seen by the sampling circuit, while 500pA off-leakage can influence settling when the source impedance is high. Designers should allow adequate acquisition time after switching and account for charge injection and hold behavior in the timing budget. Placing the switch close to the sampling node minimizes parasitic capacitance and helps isolate the held node from switching transients.
推薦
Interface Signal Multiplexing
The DG442CJ+ fits interface boards that need to share a limited number of external connector pins among internal analog functions. Four normally open channels can route a selected source to a common line without requiring four separate connector pads, and the 1:1 topology preserves signal polarity. Bidirectional conduction makes the device useful for both sourcing and monitoring. The 85Ω impedance must remain compatible with the receiving device’s input threshold and cable capacitance, while approximately 170ns and 250ns switching-time values define the minimum settling interval. A solid ground plane and short traces reduce crosstalk between the four selected paths.
推薦
推薦產品摘要
工程參考資料，適用於 DG442CJ+ — 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 | DG442DJ-E3 | DG442DJ+ | MAX362CPE+ | MAX362EPE | DG442DY-E3 |
|---|---|---|---|---|---|---|
| Package | 16-PDIP | 16-PDIP - same | 16-PDIP - same | 16-PDIP - same | 16-PDIP - same | 16-PDIP - same |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Number of Circuits | 4 circuits | 4 circuits | 4 circuits | 4 circuits | 4 circuits | 4 circuits |
| Switch Configuration | 1:1 SPST | SPST | SPST | SPST | SPST | SPST |
| Mounting Type | Through hole | Through hole | Through hole | Through hole | Through hole | Through hole |
主要差異化特點
- Guaranteed channel-to-channel on-resistance matching (對比MAX362EPE)
- Directly confirmed through-hole replacement path (對比DG442DJ-E3)
- Four normally open SPST paths in one package (對比MAX362CPE+)
設計說明
Treat the 85Ω on-resistance as part of the source impedance driving the selected load. For a high-impedance receiver, verify attenuation and settling; for a low-impedance load, confirm that the switch current remains within its specified limits. Place the DG442CJ+ close to the selected signal source or receiving amplifier, use short traces, and avoid routing adjacent switched nodes in parallel where coupling could increase crosstalk.
Do not substitute the normally open DG442CJ+ for a normally closed part without reviewing the system behavior. Break-before-make operation can create a short interruption between old and new paths, which is desirable in many routing circuits but can produce an invalid transient in applications expecting overlap. Add control dead time where required and verify the exact DG442 pin-description table before assigning control inputs.
Use a low-impedance ground plane and decouple the device supply according to the manufacturer application circuit. Keep the analog signal pins and their associated traces away from clocks, relay contacts, inductors, and power-switching nodes. Because this is a through-hole 16-PDIP package, preserve adequate spacing from heat sources and avoid long unprotected signal stubs that can increase pickup and settling time.
For measurement and audio paths, connect the device ground directly to the quiet analog ground region and return switched-node currents by the shortest practical route. If the control signals originate in a noisy digital domain, keep their traces away from high-impedance inputs and use the circuit arrangement shown in the manufacturer datasheet. Do not rely on package proximity alone as evidence of equivalent pin functions when evaluating a substitute.
合規資訊
No RoHS, REACH, halogen-free, conflict-minerals, or AEC-Q100 declaration was identified for the commercial DG442CJ+ order code. The through-hole commercial-grade variant is not treated as an AEC-Q100-qualified automotive part.
