DG444DJ+ - Quad SPST Analog Switch, 85 ohm, 16-DIP
MPN： DG444DJ+ ✓ 啟用中DG444DJ+ 概覽
An analog switch is a solid-state semiconductor device that connects or isolates circuit nodes under digital control. The DG444 belongs to the CMOS analog-switch family within the broader interface-IC hierarchy. Unlike mechanical relays, it operates without moving contacts, allowing faster switching, compact integration, and low control-power consumption. This quad SPST arrangement is useful wherever several independent analog paths must be sampled, routed, or isolated.
Key features include four independent SPST channels, low on-resistance, low leakage, fast switching, low power consumption, and TTL/CMOS-compatible logic inputs. According to the manufacturer datasheet, the on-resistance matching between switches is limited to 4 ohms maximum, while guaranteed on-resistance flatness across the signal range is limited to 9 ohms maximum. These characteristics improve channel-to-channel consistency and reduce gain variation when the same switch type is used in multiple signal paths.
The DG444 family is built to provide predictable operation in precision analog systems. On-resistance matching limits channel mismatch, while low leakage helps preserve weakly driven signals when a channel is disconnected. Fast switching action supports measurement, test, and sampling systems in which the control system must select a new source quickly. Because the switches are CMOS devices, control inputs can operate from standard digital logic families, allowing a microcontroller or programmable logic device to manage channel selection.
Typical uses include sample-and-hold circuits, test and measurement systems, multiplexed instrumentation, battery-powered test equipment, and signal-routing modules. The four normally open switches can independently connect an external analog node to one of four internal or external destinations. In bidirectional signal paths, the switch conducts equally well in either direction, which supports measurement and audio-oriented circuits where the signal source may change.
For PCB design, place the DG444DJ+ close to the routed analog nodes to minimize trace capacitance and pickup. Keep high-impedance paths short, provide a stable ground reference, and route digital control traces away from sensitive analog inputs. Check supply decoupling at the IC and ensure control signals remain within the datasheet limits during power-up and power-down.
This page combines the DG444 family specifications, verified source links, same-package drop-in candidates, application guidance, and design considerations to help engineers evaluate the DG444DJ+ before integrating it into a new analog-routing design.
直接替換替代品，適用於 DG444DJ+ — 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： DG444DJ+ （相同外形與佔位） — 差異在於 Switch Configuration.
DG444DJ
✅ 直接替換📋 參考替代品（不在目錄中）
DG444CJ+
✅ 直接替換聯絡詢價
查看資料表 →DG444BDJ
✅ 直接替換📋 參考替代品（不在目錄中）
DG444DJ+ 最大額定值與電氣特性
| Number of Channels | 4 channels |
| Switch Configuration | 4 independent SPST switches |
| On-Resistance | 85 ohm maximum |
| On-Resistance Matching | 4 ohm maximum between switches |
| On-Resistance Flatness | 9 ohm maximum over the signal range |
| Supply Voltage Range | 10 V to 30 V |
| Dual Supply Operating Range | ±4.5 V to ±20 V |
| Control Logic Compatibility | TTL and CMOS compatible |
| 封裝 | 16-pin PDIP |
| 安裝類型 | Through-hole |
| Terminal Count | 16 terminals |
| Technology | High-voltage silicon-gate CMOS |
| Switching Time | 120 ns tON maximum |
| Leakage Current | 80 pA maximum |
| Low Power Consumption | 22 nW |
| Latchup Protection | Epitaxial layer on high-voltage silicon-gate process |
DG444DJ+ 16-pin pdip 腳位配置指南
DG444DJ+（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： DG444DJ+.
請參閱 資料表 以查看完整腳位配置。
典型應用
DG444DJ+ 適用於 6 應用s: Multiplexed Instrumentation, Sample-and-Hold Systems, Battery-Powered Test Equipment, Signal Isolation and Routing, Data Acquisition Front Ends, Audio Signal Routing.
Multiplexed Instrumentation
The DG444DJ+ fits a multiplexed instrumentation front end because it combines four independent SPST channels with an 85 ohm maximum on-resistance and channel matching limited to 4 ohm maximum. The four switches can connect separate sensors or test nodes to a shared measurement amplifier while the control logic selects the active path. Matching helps reduce channel-dependent gain errors, while low leakage of 80 pA maximum protects high-impedance sensor outputs when a channel is open. Use short analog traces and a low-impedance reference return to minimize additional error. Because the switch adds resistance in the signal path, account for that contribution when calculating measurement-system gain and input loading.
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Sample-and-Hold Systems
The DG444DJ+ is suitable for sample-and-hold circuitry because its maximum tON of 120 ns allows the analog path to connect quickly after a control command. Its four normally open SPST switches can be coordinated to isolate a source, connect a sampling capacitor, and reconnect subsequent circuit stages. Low switch leakage of 80 pA maximum reduces unwanted charge loss from a high-impedance holding capacitor, while the 85 ohm maximum on-resistance limits charging time during acquisition. Choose capacitor and buffer values with the switch resistance included in the settling calculation, and keep the holding node physically compact to minimize parasitic pickup.
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Battery-Powered Test Equipment
The DG444DJ+ supports battery-powered test equipment where analog routing must be controlled without excessive standby power. The DG444 family specifies low power consumption of 22 nW and accepts TTL- or CMOS-compatible control inputs, allowing the switches to be managed by a low-power controller. The 10 V to 30 V total supply range supports common laboratory and industrial rail arrangements, including dual supplies from ±4.5 V to ±20 V. Account for the complete power budget at both logic-control states and use rail bypass capacitors close to the device. Verify startup behavior so partially powered control inputs cannot produce an unintended analog connection.
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Signal Isolation and Routing
The DG444DJ+ can isolate and route up to four analog branches in equipment that must prevent unwanted loading between stages. Each SPST switch provides a normally open connection that can be controlled independently, and low leakage of 80 pA maximum helps preserve signals on high-impedance nodes while disconnected. The bidirectional conduction characteristics make the device suitable for signal paths where energy may flow either way, including measurement and audio-related routing. Design the off-state nodes for the maximum expected voltage, preserve a continuous ground path, and use guarded routing around sensitive lines to reduce capacitive coupling from adjacent switch nodes.
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Data Acquisition Front Ends
The DG444DJ+ fits multi-channel data-acquisition designs that require deterministic routing into a common analog front end. Four switches reduce the number of separate physical input paths while the 4 ohm maximum on-resistance matching limits channel-to-channel variation. The 9 ohm maximum flatness specification also helps characterize signal-dependent behavior across the operating range. Place the switch close to the input connector or sensor interface, terminate unused channels in a manner consistent with the source impedance, and keep digital selector traces away from the high-impedance analog inputs. Validate settling after each selection before treating the acquired sample as accurate.
推薦
Audio Signal Routing
The DG444DJ+ can route audio or other low-frequency bipolar signals through four independently controlled SPST channels. Its bidirectional behavior permits signal flow in either direction, and the low-leakage specification helps preserve weakly loaded audio nodes during disconnected intervals. On-resistance matching within 4 ohm maximum reduces differences between switch paths when several sources feed a common output. The switch’s maximum on-resistance of 85 ohm may be significant for low-impedance audio nodes, so buffer the selected path when attenuation or channel variation is important. Keep the routing ground plane continuous and isolate motor, relay, and switching-converter noise from the audio path.
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推薦產品摘要
工程參考資料，適用於 DG444DJ+ — 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 | DG444DJ | DG444CJ+ | DG444BDJ |
|---|---|---|---|---|
| Brand | Analog Devices | Vishay Intertechnology | Analog Devices | Vishay Intertechnology |
| Package | 16-pin PDIP | 16-pin PDIP - same | 16-pin PDIP - same | 16-pin PDIP - same |
| Number of Channels | 4 channels | 4 channels | 4 channels | 4 channels |
| Switch Configuration | 4 independent SPST switches | 4 independent SPST switches | 4 independent SPST switches | 4 independent SPST switches |
主要差異化特點
- Improved DG444 family matching (對比DG444DJ)
- Documented direct replacement path (對比DG444BDJ)
- Dual-supply flexibility (對比DG444BDJ)
- Fast four-channel routing (對比DG444CJ+)
設計說明
Place the DG444DJ+ close to the switched analog nodes and route each switch terminal directly to its intended connector or circuit. Keep traces short to limit parasitic capacitance, especially when the source impedance is high. Maintain a continuous ground reference beneath or adjacent to the analog routing, and route digital selector lines away from sensitive inputs. For high-impedance nodes, minimize exposed copper and avoid nearby switching-power nodes to reduce leakage, injection, and pickup errors.
Include the maximum 85 ohm on-resistance when calculating attenuation, charging time, and amplifier-input loading. For a resistive divider formed by the switch and a known load, use the actual resistance under the selected voltage and temperature conditions rather than assuming the minimum value. The 4 ohm maximum matching specification helps compare channels, but each path can still carry a similar absolute resistance. Add a buffer when source impedance is low, the switch resistance is a significant fraction of the load, or channel-dependent gain is critical.
Confirm that the selected DG444DJ+ ordering option supports the intended single- or dual-supply arrangement. The family operates from 10 V to 30 V total supply, with dual operation from ±4.5 V to ±20 V, but exact absolute-maximum limits must be taken from the manufacturer data sheet. Place input bypass capacitors close to the supply pins and provide a low-impedance return for switching current. Define valid control states during startup and shutdown so the analog paths cannot connect unexpectedly while the rails are unsettled.
Do not treat same-package listings as automatically equivalent. Before substituting DG444DJ, DG444CJ+, or DG444BDJ, compare pin orientation, control-input thresholds, supply requirements, leakage, switching timing, absolute-maximum ratings, temperature grade, and lifecycle status. In particular, DG444BDJ is listed with 80 ohm maximum on-resistance and explicit ±15 V dual-supply support, while the target listing identifies 85 ohm maximum resistance and a wider family supply range. Document any intentional operating-point difference.
合規資訊
The manufacturer product page identifies the DG444 family as a production product, but no explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals declaration appears in the source material.