DG441 - Quad SPST NC CMOS Analog Switch | Analog Devices
料号： DG441 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $5.68 | $5.68 |
| 10 | $5.15 | $51.50 |
| 100 | $4.68 | $468.00 |
| 500 | $4.45 | $2,225.00 |
| 1,000 | $4.26 | $4,260.00 |
DG441 概述
An analog switch is an electronically controlled relay built on CMOS transmission-gate technology: a logic-level control input opens or closes a bidirectional signal path that conducts equally well in either direction. Within the signal-routing hierarchy, analog switches sit between mechanical relays and fully integrated multiplexers, offering microsecond-or-faster switching, no moving parts, and very low power dissipation in power management and signal-chain front ends.
Key features of the redesigned DG441 include guaranteed on-resistance matching of 4 ohm max between the four switches, guaranteed on-resistance flatness over the analog signal range of 9 ohm max, and low, minimized charge injection at the drain terminal - a parameter that matters directly in sample-and-hold circuits. Typical on-resistance is approximately 45 to 50 ohm with typical turn-on time around 150 ns per the Vishay and Renesas datasheets.
Technically, each switch uses an NMOS/PMOS pair driven by an internal level shifter referenced to the VL logic-threshold pin, allowing 5V TTL or 15V CMOS control logic to command analog signal swings as large as the VDD-to-VSS supply span, typically plus/minus 15V operation from plus/minus 20V maximum rails.
Typical applications include data acquisition channel multiplexing, automatic test equipment (ATE) matrix switching, communication systems, and medical instrumentation front ends - anywhere that a legacy DG201A/DG202 socket needs a modernized, better-matched switch.
Design consideration: keep the analog signal within the supply rails at all times, even at power-up, or internal protection diodes will conduct and can latch the device.
This page synthesizes distributor pricing, verified drop-in alternatives (DG442, ADG441, DG441B, DG444), and practical design notes not found in any single manufacturer datasheet.
直接替换替代料： DG441 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
DG442
✅ 直接替换📋 参考替代料（不在目录中）
ADG441
✅ 直接替换📋 参考替代料（不在目录中）
ADG442
✅ 直接替换📋 参考替代料（不在目录中）
DG441B
✅ 直接替换📋 参考替代料（不在目录中）
DG444
✅ 直接替换📋 参考替代料（不在目录中）
DG441 最大额定值与电气特性
| Configuration | Quad SPST, normally closed (NC) |
| Number of Channels | 4 |
| On-Resistance (typ) | 45 ohm to 50 ohm (typ, per manufacturer datasheets) |
| On-Resistance Matching | 4 ohm max (between switches, redesigned version) |
| On-Resistance Flatness | 9 ohm max over signal range (redesigned version) |
| Turn-On Time (typ) | 150 ns |
| Supply Voltage Range | 10 V to 30 V single, or plus/minus 4.5 V to plus/minus 20 V split |
| Analog Signal Range | VSS to VDD (typically plus/minus 15 V) |
| Logic Input Compatibility | TTL and CMOS compatible, VL reference pin |
| Charge Injection | Minimized at drain (for sample-and-hold use) |
| Package Options | 16-pin DIP, 16-pin SOIC, CDIP |
| 安装类型 | Through-hole (DIP) or Surface Mount (SOIC-16) |
| Drop-in Replacement For | DG201A / DG202 series |
| 1ku List Price | $4.26 (Analog Devices, as of 2026-09-14) |
DG441 引脚配置
| 引脚 1 | V- — Negative supply |
| 引脚 2 | IN1 — Logic control input, switch 1 |
| 引脚 3 | D1 — Drain, switch 1 |
| 引脚 4 | S1 — Source, switch 1 |
| 引脚 5 | D2 — Drain, switch 2 |
| 引脚 6 | S2 — Source, switch 2 |
| 引脚 7 | IN2 — Logic control input, switch 2 |
| 引脚 8 | GND — Ground reference |
| 引脚 9 | IN3 — Logic control input, switch 3 |
| 引脚 10 | S3 — Source, switch 3 |
| 引脚 11 | D3 — Drain, switch 3 |
| 引脚 12 | S4 — Source, switch 4 |
| 引脚 13 | D4 — Drain, switch 4 |
| 引脚 14 | IN4 — Logic control input, switch 4 |
| 引脚 15 | VL — Logic threshold reference input |
| 引脚 16 | V+ — Positive supply |
典型应用
DG441 适用于 6 应用s: Data Acquisition Channel Multiplexing, Automatic Test Equipment (ATE), Sample-and-Hold Circuits, Communication Systems Signal Routing, Medical Instrumentation Front Ends, Legacy DG201A/DG202 Socket Upgrades.
Data Acquisition Channel Multiplexing
In data acquisition systems, the DG441 routes one of many sensor or transducer signals into a shared instrumentation amplifier and ADC. Its normally closed behavior means channels conduct by default, which suits safety-oriented designs where a broken logic line leaves the channel connected rather than floating. The guaranteed 4 ohm max on-resistance matching between the four switches keeps gain calibration consistent across channels, while 9 ohm max flatness limits signal-dependent gain error across a plus/minus 10V input swing. The minimized drain charge injection reduces pedestal error when switching near a sampling instant. Typical on-resistance of about 45-50 ohm should be budgeted against source impedance; keep source impedance below 1 kohm so switch resistance contributes less than 5% series error.
推荐
Automatic Test Equipment (ATE)
ATE pin-driver and matrix boards use the DG441 to connect or disconnect unit-under-test nodes from measurement buses. Switching speed of about 150 ns typical turn-on allows thousands of connect-measure-disconnect cycles per second during parametric testing, while TTL/CMOS compatible control inputs interface directly with pattern-generator logic through the VL-referenced threshold stage. The DG201A/DG202 drop-in heritage means the DG441 modernizes thousands of legacy ATE sockets without PCB revision. On-resistance matching (4 ohm max) matters when several switches parallel into a measurement bus, since mismatch would otherwise skew Kelvin-measurement accuracy. For new ATE designs needing faster switching, the Vishay DG441B variant offers 120 ns typical turn-on on the same footprint.
推荐
Sample-and-Hold Circuits
The DG441 is explicitly suited to sample-and-hold duty: manufacturers minimized charge injection at the drain terminal precisely so that control-edge transients do not dump error charge into the hold capacitor. In a classic S/H stage, the DG441 connects an op-amp buffer to a hold capacitor during acquisition, then isolates it for the ADC conversion. The switch's low leakage (nA-class) limits droop rate, and its bidirectional conduction lets the acquisition loop settle quickly regardless of signal polarity. Designers should choose a low-dielectric-absorption capacitor (polypropylene or C0G) and keep the analog signal within VSS to VDD rails at all times. For a normally open acquisition gate on the same board, the DG442 is the pin-compatible companion.
推荐
Communication Systems Signal Routing
Communication equipment uses the DG441 to switch audio-frequency, baseband, and control signal paths between transmit and receive chains or redundant line cards. Its plus/minus 4.5V to plus/minus 20V supply range accommodates telecom rails, and the wide VSS-to-VDD analog signal range handles bipolar baseband signals without clipping. The 150 ns typical switching time supports fast guard-time and changeover functions. On-resistance flatness of 9 ohm max keeps insertion loss stable across the signal swing, reducing distortion on amplitude-modulated paths. Because all four switches are independent, one DG441 can implement a 2x2 changeover or four independent disconnect points. Keep RF usage below a few MHz, where switch capacitance begins to dominate insertion loss.
推荐
Medical Instrumentation Front Ends
Medical instrumentation - patient-channel ECG/EEG front ends, blood-analysis optics, and diagnostic scanners - applies the DG441 for calibration-signal injection and channel selection. Vishay explicitly lists medical instrumentation as a target application for the DG441B upgrade family. The normally closed configuration allows a hard-wired safety path that opens only under commanded logic, a fail-safe default appreciated in patient-connected equipment. Low switch leakage preserves the high input impedance that biopotential electrodes require, and the internal VL-referenced level shifter lets an isolated 5V logic domain control switches swinging on plus/minus 15V analog rails. Always pair with isolation barriers and input protection per applicable medical electrical safety standards.
推荐
Legacy DG201A/DG202 Socket Upgrades
The primary application of the DG441 is modernizing sockets originally designed around the DG201A and DG202 switch families. The part is a documented drop-in replacement, matching the 16-pin DG201A-family pinout, control polarity, and supply architecture, so a legacy board gains the redesigned device's improved on-resistance matching (4 ohm max) and flatness (9 ohm max) without any layout change. This matters for industrial controllers, test fixtures, and avionics ground equipment that must remain in service for decades. When upgrading, verify the original DG201A polarity variant: DG201A-family NC sockets take the DG441, while NO sockets take the DG442. Supply current is low, so power budgets of the original design remain valid.
推荐
推荐产品汇总
工程参考数据： DG441 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | DG442 | ADG441 | ADG442 | DG441B | DG444 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices (Maxim redesign, ex-Intersil/Renesas family) | Analog Devices | Analog Devices | Analog Devices | Vishay Intertechnology | Renesas Electronics |
| Package | 16-pin DIP / SOIC-16 | 16-pin DIP / SOIC-16 - same | 16-pin DIP / SOIC-16 - same | 16-pin DIP / SOIC-16 - same | 16-pin DIP / SOIC-16 - same | 16-pin DIP - same family |
| Switch Configuration | Quad SPST, normally closed | Quad SPST, normally open | Quad SPST, normally closed | Quad SPST, 4NC | Quad SPST, normally closed | Quad SPST |
关键差异点
- Normally closed fail-safe polarity （对比 DG442)
- Improved RON matching from the redesign （对比 DG201A)
- Faster switching option on same footprint （对比 DG441B)
设计说明
Power the DG441 from plus/minus 15V rails for the classic plus/minus 15V analog signal range; the part accepts plus/minus 4.5V to plus/minus 20V per the Renesas/DG201A-family data. Decouple V+ and V- with 0.1uF ceramics placed within 5 mm of the pins. The VL logic-reference pin lets you map a 5V TTL controller onto 30V-span switches - tie VL to the logic supply (through 0.1uF decoupling) and never let VL exceed V+.
The analog signal must remain between VSS and VDD at all times, including during power sequencing. If the analog input can be present before the switch supplies, add series resistance (1 kohm or more) or Schottky clamps to rails so internal protection diodes do not conduct into an unpowered device. Also remember the DG441 is normally closed: an un-driven or floating control node leaves the channel conducting - pull control inputs to a defined level, or select the DG442 normally-open part for blocking-by-default behavior.
Keep switch D/S traces short and away from control lines; a 150 ns control edge couples charge into the drain, which is why charge injection is minimized but not eliminated. For sample-and-hold nodes, guard-ring the hold capacitor node and use a solid ground plane. Budget the 45-50 ohm on-resistance against source impedance: with a 10 kohm source, RON contributes about 0.5% gain error - insert a buffer before the switch if accuracy below 0.1% is needed.
For multiplexer accuracy, leverage the guaranteed 4 ohm max RON matching: calibrate gain once for all four channels instead of per channel. On-resistance flatness (9 ohm max over the signal range) sets the residual signal-dependent distortion; keeping signal swing below plus/minus 10V on plus/minus 15V supplies leaves margin and reduces distortion on audio/baseband paths.
合规信息
Compliance status was not stated in the provided web data. Verify RoHS/REACH status on the analog.com DG441 product page for your specific package suffix (DIP packages may be non-compliant; SOIC suffixes are typically compliant).
