DG425DJ - Low-Power CMOS Latched Analog Switch | Maxim Integrated
MPN： DG425DJ ✓ 啟用中DG425DJ 概覽
An analog switch is an electronic semiconductor device that routes electrical signals between circuit paths under digital control. CMOS analog switches combine low power consumption with high input impedance and bidirectional signal conduction. The DG425 family belongs to the analog switch and multiplexer hierarchy, where switches select or isolate analog signals while multiplexers combine multiple inputs into a common output. The latched control interface allows the selected signal path to remain in its commanded state without continuous control activity.
The DG425DJ offers equal on-resistance matching between switches, with the manufacturer specifying 3 Ω maximum. Its typical on-resistance is 20 Ω, while flatness across the signal range is limited to 4 Ω maximum. These matching and flatness characteristics reduce channel-dependent gain and timing differences when the device is used for precision signal selection. The switch also provides bidirectional conduction, making it suitable for signal paths where the source direction can change.
Charge injection is limited to 15 pC maximum, a useful specification when the switch controls sampled or held analog signals. The device provides ESD tolerance of at least 2000 V under Method 3015.7. Off leakage is specified below 5 nA at +85 °C, supporting isolation between inactive and active channels. Latch timing values include tWW of 200 ns maximum, tDW of 100 ns maximum, and tWD of 100 ns maximum.
Typical applications include microprocessor-controlled signal routing, test and measurement systems, industrial control interfaces, data acquisition equipment, and analog signal multiplexing. The latch allows firmware or hardware control logic to establish a connection and then reduce switching-control activity, provided the selected state is not affected by later pulses.
When laying out a DG425DJ circuit, route sensitive signals with short traces and provide a stable ground reference. Keep latch-control traces away from analog inputs because coupling from fast digital transitions can disturb held nodes or inject charge into downstream amplifiers. Confirm signal amplitude, bandwidth, leakage, and logic levels against the complete manufacturer datasheet before production use.
This page combines the verified DG425DJ manufacturer and distributor information with explicit data-gap markers, application guidance, family comparisons, and selection advice. It does not substitute estimated electrical specifications for values absent from the retrieved source data.
直接替換替代品，適用於 DG425DJ — 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。
此產品無可直接替換的替代品。
申請替代品DG425DJ 最大額定值與電氣特性
| Product Type | Dual CMOS analog switch with latch |
| Typical On-Resistance | 20 Ω |
| On-Resistance Matching Between Switches | 3 Ω maximum |
| On-Resistance Flatness Over Signal Range | 4 Ω maximum |
| Charge Injection | 15 pC maximum |
| Off Leakage Current | <5 nA at +85 °C |
| ESD Tolerance | 2000 V minimum per Method 3015.7 |
| Latch Write-Write Time tWW | 200 ns maximum |
| Latch Data-Write Time tDW | 100 ns maximum |
| Latch Write-Data Time tWD | 100 ns maximum |
| Signal Conduction Direction | Bidirectional |
| Logic | CMOS |
| Power Class | Low-power |
| 封裝 | 16-pin DIP |
| 安裝類型 | Through-hole |
| Number of Switches | 2 |
| RoHS 狀態 | Non-compliant per distributor listing |
DG425DJ 16-pin dip 腳位配置指南
DG425DJ（16-pin dip 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： DG425DJ.
請參閱 資料表 以查看完整腳位配置。
典型應用
DG425DJ 適用於 6 應用s: Microprocessor-Controlled Analog Routing, Data Acquisition Signal Selection, Test and Measurement Signal Paths, Industrial Control Signal Multiplexing, Battery-Powered Portable Instrumentation, Automated Equipment Signal Isolation.
Microprocessor-Controlled Analog Routing
The DG425DJ fits a general-purpose analog routing stage controlled by a microprocessor or microcontroller. Its latch retains the selected switch state, while the 20 Ω typical on-resistance and 3 Ω maximum matching between switches help reduce channel-dependent signal attenuation. The bidirectional conduction also permits either side of the switched path to become the source. In a practical circuit, connect the latch-control signals through suitable logic and keep the analog traces short. Confirm the control truth table and timing against the manufacturer datasheet, particularly the 200 ns maximum tWW and 100 ns maximum tDW and tWD limits. The key design benefit is retained routing with low-power CMOS behavior, although the signal bandwidth and allowed analog voltage range remain design inputs that must be verified before implementation.
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Data Acquisition Signal Selection
The DG425DJ can select between analog sources in a data-acquisition front end where channel consistency is important. The manufacturer specifies 3 Ω maximum on-resistance matching between switches and 4 Ω maximum flatness over the signal range, helping limit gain variation between selected channels. A practical implementation places the switch close to the source multiplexer and drives its latch inputs from acquisition-control logic. The 15 pC maximum charge injection must be considered when the selected node feeds a sample-and-hold stage. Keep clock and latch traces away from sensitive analog lines, and verify input impedance, settling time, and maximum signal voltage against the complete datasheet before selecting the device for high-accuracy acquisition.
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Test and Measurement Signal Paths
DG425DJ is suitable for routing instrumentation signals when a compact, low-power, latched analog switch is required. Its typical on-resistance of 20 Ω can limit signal attenuation for relatively low-impedance measurement paths, while the specified 3 Ω maximum matching supports repeatable comparisons between channels. The device conducts in both directions, permitting either a source or an instrument-side node to drive the selected path. In a test fixture, minimize copper length around the switch and provide a continuous ground reference to reduce coupling. Because the retrieved sources do not provide the full bandwidth, capacitance, channel-isolation, or operating-voltage ratings, engineers should validate the complete datasheet against the intended signal range before inserting the part into precision measurement circuitry.
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Industrial Control Signal Multiplexing
The DG425DJ can route low-power control or sensor signals in industrial equipment when the manufacturer ratings cover the system rails and temperatures. Its off leakage is specified below 5 nA at +85 °C, and ESD tolerance is at least 2000 V under Method 3015.7, both relevant considerations in industrial signal isolation. The latched interface lets the controller establish a route without continuously toggling the switch command. Place the device near the protected signal node, maintain a low-impedance ground path, and use appropriate external protection when the connected cable or field wiring can exceed the device's ESD ratings. The source data does not state the full operating-temperature range, supply limits, or analog voltage range, so qualification requires checking those values in the manufacturer datasheet.
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Battery-Powered Portable Instrumentation
DG425DJ is appropriate for compact, battery-powered measurement equipment that needs controllable analog routing without a continuously asserted switch command. The device is identified as a low-power CMOS analog switch with latches, allowing the control state to be retained after configuration. Its typical 20 Ω on-resistance should be compared with the source impedance and required attenuation budget, because the switch resistance adds to the signal path. In a portable design, minimize leakage into surrounding nodes and account for the specified off leakage below 5 nA at +85 °C during power-state evaluation. The retrieved information does not include supply-current values or the allowable input-voltage range, so battery life and rail compatibility must be confirmed from the complete manufacturer documentation.
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Automated Equipment Signal Isolation
The DG425DJ can isolate inactive signal branches in automated test equipment while preserving low on-resistance on the selected route. Its 4 Ω maximum flatness over the signal range helps reduce amplitude variation across the operating range, while matched switch resistance supports consistent behavior when multiple channels are scanned. Bidirectional conduction allows the selected path to be used in source, sink, or feedback arrangements. In a fixture, place the switch near the tested node, isolate unused branches, and keep latch-control transitions away from sensitive conductors. Charge injection of 15 pC maximum should be included in the error budget for downstream sampling circuits. Verify signal bandwidth, isolation, and switching time in the complete datasheet because those parameters were not available in the retrieved snippets.
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推薦產品摘要
工程參考資料，適用於 DG425DJ — 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 |
|---|---|
| Package | 16-pin DIP |
| Brand | Maxim Integrated |
| Product Type | Dual CMOS analog switch with latch |
| Typical On-Resistance | 20 Ω |
| On-Resistance Matching | 3 Ω maximum |
| On-Resistance Flatness | 4 Ω maximum over the signal range |
| Charge Injection | 15 pC maximum |
| Off Leakage Current | <5 nA at +85 °C |
| ESD Tolerance | 2000 V minimum per Method 3015.7 |
| Latch Timing | tWW ≤200 ns; tDW ≤100 ns; tWD ≤100 ns |
| Signal Conduction | Bidirectional |
| RoHS Status | Non-compliant per distributor listing |
主要差異化特點
- Guaranteed matching between internal switches (對比DG421DJ)
- Low typical on-resistance for a latched CMOS switch (對比DG423DJ)
- Defined charge-injection limit (對比DG421DJ)
設計說明
Keep the DG425DJ close to the analog node being switched and use short, direct traces for both switch terminals. Place input and output bypass or protection components where their electrical function is required by the system design, but avoid long loops that can capture latch-control transitions. A solid ground reference is important because the 20 Ω typical on-resistance can interact with source impedance and PCB resistance, making it harder to distinguish intended attenuation from layout-induced loss.
Route latch-control traces away from sensitive analog paths and use grounded guard structures where practical. The DG425DJ has specified charge injection of 15 pC maximum, so a control transition can displace charge at the switched node. If the output feeds a sampler, amplifier, or capacitor, include this value in the timing and error budget. Also verify that control edge rates satisfy the manufacturer timing specifications rather than relying only on nominal propagation delay.
Do not treat DG421DJ, DG423DJ, or DG425DJ as interchangeable solely because they share the DG42x family name. Switch count and control configuration can differ, so verify every pin and latch truth-table entry in the official ordering guide. Similarly, do not assume that a generic 16-pin analog switch is a drop-in replacement: the replacement must match the package, pinout, supply requirements, signal-voltage range, on-resistance, charge injection, and latch timing.
Evaluate the switched-node bias and leakage budget before applying the switch. The verified data specifies off leakage below 5 nA at +85 °C, which can matter when high-impedance sensors or held capacitors are connected to an inactive branch. Supply voltage, quiescent current, logic thresholds, and input overvoltage behavior were not present in the retrieved source and must be obtained from the manufacturer datasheet before power sequencing or rail budgeting.
合規資訊
The IC Components Ltd distributor listing explicitly identifies the RoHS status as non-compliant. No verified REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declaration was present in the supplied sources.
