DG418DY+ - 35 Ohm Precision CMOS Analog Switch | Analog Devices
부품 번호: DG418DY+ ✓ 활성DG418DY+ 개요
An analog switch is a semiconductor device that routes electrical signals between circuit nodes under digital control. The DG418DY+ combines low power, low leakage, high switching speed, and low on-resistance in a compact surface-mount package. In this switching role, the 1:1 configuration provides one signal path for signal-routing, test, measurement, and control systems.
Key features include a typical on-resistance of 35 ohms, maximum on-resistance matching of 3 ohms between switches, and maximum on-resistance flatness of 4 ohms across the signal range. These characteristics help limit resistance variation when a switched signal changes amplitude. The device is manufactured in an 8-SOIC package for compact surface-mount PCB layouts.
The DG418DY+ is part of Maxim Integrated's redesigned precision CMOS monolithic analog-switch family. Its low-leakage behavior is suitable for circuits where the off-state contribution to system error must remain small. The 35-ohm on resistance also makes the switch appropriate for general-purpose low- and moderate-impedance analog signals rather than applications requiring near-zero resistance.
Typical uses include battery-powered instrumentation, industrial control systems, data-acquisition equipment, test and measurement setups, and portable or military electronic systems. The 8-pin SOIC package supports conventional surface-mount assembly, while the low power and leakage characteristics suit systems where standby current and signal integrity affect overall performance.
When designing around the DG418DY+, verify the control logic, supply arrangement, input signal range, and external pull-up or pull-down requirements against the manufacturer pin description and application guidance. The switching node should also be kept away from fast digital return paths to reduce coupling into the analog signal path.
This product page combines the manufacturer specifications, drop-in replacement research, a package and pinout reference, and practical engineering guidance to support component selection and PCB implementation.
드롭인 대체품: DG418DY+ — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
DG418DY
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
DG418DY+ 최대 정격 & 전기적 특성
| Product Type | Precision CMOS monolithic analog switch |
| Number of Circuits | 1 circuit |
| Multiplexer Configuration | 1:1 |
| Switch Configuration | SPST normally open |
| On-Resistance | 35 ohm |
| On-Resistance Matching | 3 ohm maximum between switches |
| On-Resistance Flatness | 4 ohm maximum over the signal range |
| Supply Configuration | 12 V single supply |
| 패키지 | 8-SOIC, 3.90 mm width |
| 실장 유형 | Surface mount |
DG418DY+ 핀 구성
| 핀 1 | IN1 — Control input for switch 1 |
| 핀 2 | D1 — Drain terminal of switch 1 |
| 핀 3 | S — Source terminal of switch 1 |
| 핀 4 | V+ — Positive supply connection |
| 핀 5 | V- — Negative supply or ground connection |
| 핀 6 | S — Source terminal of switch 1 |
| 핀 7 | D1 — Drain terminal of switch 1 |
| 핀 8 | IN1 — Control input for switch 1 |
일반적인 애플리케이션
DG418DY+ 적합 용도: 6 애플리케이션s: Portable Instrumentation, Data Acquisition Systems, Industrial Control Signal Routing, Battery-Powered Sensors, Test and Measurement Equipment, Audio and Low-Level Signal Routing.
Portable Instrumentation
The DG418DY+ fits portable measurement instruments that route sensor signals while prioritizing low leakage, compact packaging, and low power. Its 35-ohm on-resistance is appropriate for many low- and moderate-impedance sensing paths, while the 8-SOIC package preserves board area. When the switch connects to high-impedance sensors, verify the input signal range and off leakage against the amplifier input impedance and instrument error budget.
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Data Acquisition Systems
The DG418DY+ can provide a compact default-open analog routing element in data-acquisition and test systems. Its one-channel 1:1 configuration supports straightforward signal isolation or controlled connection to a measurement front end. The 35-ohm path resistance must be included in the source-impedance calculation, while maximum on-resistance matching of 3 ohms helps control channel-to-channel variation when multiple channels use the same switching topology.
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Industrial Control Signal Routing
The DG418DY+ is suitable for industrial control boards that require a small, normally open analog path for routing control or feedback signals. Its 8-SOIC surface-mount package supports automated assembly, and the 35-ohm on-resistance can satisfy many control-signal loads. Confirm the operating temperature range and absolute maximum voltage ratings for the installed enclosure, and isolate the analog trace from motor, relay, and power-converter switching nodes.
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Battery-Powered Sensors
The DG418DY+ can be used in battery-powered sensor interfaces because its DG418 family emphasizes low power and low leakage in a compact package. The normally open state provides a defined disconnected condition when a sensor channel is inactive. For low-power designs, calculate the switched-path error from the 35-ohm resistance and confirm that leakage remains small relative to the sensor's full-scale current; the manufacturer documentation should be used for final operating limits.
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Test and Measurement Equipment
The DG418DY+ fits test and measurement equipment that needs controlled analog routing with modest path resistance. Its maximum on-resistance matching of 3 ohms and flatness of 4 ohms help reduce variation across the operating signal range. Designers should account for the 35-ohm insertion resistance when interpreting high-impedance measurements, and place the switch near the instrument input to minimize pickup from surrounding test leads and digital control circuitry.
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Audio and Low-Level Signal Routing
The DG418DY+ can route low-level audio or control signals when the source impedance and acceptable insertion loss permit a 35-ohm path. The small SOIC package allows placement near a connector or amplifier input, reducing trace length and susceptibility to external coupling. Use a quiet ground reference and keep the switched node away from digital clocks and regulator switching nodes. Verify signal swing, control timing, and distortion behavior in the final analog path.
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추천 제품 요약
엔지니어링 참조 데이터: DG418DY+ — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | DG418DY |
|---|---|---|
| Package | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Vishay Intertechnology |
| Number of Circuits | 1 circuit | 1 circuit |
| Multiplexer Configuration | 1:1 | 1:1 |
| Switch Configuration | SPST normally open | SPST normally open |
| On-Resistance | 35 ohm | 35 ohm |
| Supply Configuration | 12 V single supply | 12 V single supply |
| Mounting Type | Surface mount | Surface mount |
주요 차별점
- Matched low on-resistance with controlled variation (vs DG418DY)
- Single normally open routing function (vs DG418DY)
- Compact surface-mount integration (vs DG418DY)
설계 노트
Place the DG418DY+ close to the signal source or receiving circuit and connect the switched node with a short, direct trace. Keep the control input away from sensitive analog nets, and route the device ground with a low-impedance path. For instrumentation, include the 35-ohm on-resistance in the source-impedance calculation because it can attenuate a signal sourced by a high-impedance sensor.
Treat the switched node as a potential source of injected charge and transient coupling. Maintain a stable reference near the device, avoid sharing narrow analog return paths with digital clocks or power converters, and use the manufacturer pin descriptions to select any required pull resistors. When switching slow signals, allow the control edge and settling interval to complete before evaluating the acquired value.
Do not substitute a different member of the DG417, DG418, or DG419 family solely because the package is identical. The DG418DY+ is a single 1:1 SPST normally open switch; other family members may provide SPDT or multiplexer functions with different pin assignments. Verify control polarity, absolute maximum ratings, input signal range, leakage, and timing in the manufacturer data sheet before approving a replacement.
규정 준수 정보
The Analog Devices DG418 product page identifies the DG418 as a production product but does not state the individual compliance fields represented in this section.