DG309CJ+ - Quad SPST Normally Closed Analog Switch, 60 Ohm | Maxim Integrated
料号： DG309CJ+ ✓ 量产中DG309CJ+ 概述
An analog switch is a voltage-controlled semiconductor device that routes analog signals between circuit nodes using MOSFET pass elements rather than mechanical contacts. In the taxonomy of electronic components, a DG309CJ+ belongs to the analog switch family, which sits under interface ICs, alongside multiplexers, demultiplexers, and matrix switchers. Because it uses CMOS pass transistors instead of relay contacts, it offers near-solid-state reliability, microsecond-to-nanosecond switching, and negligible signal degradation when the supply rails are respected.
Key features include a low 60 ohm on-resistance across the analog range, turn-on time below 120 ns, turn-off time below 90 ns, and very low power dissipation of about 30 nW per closed channel. Inputs are CMOS logic compatible, and the switch supports full rail-to-rail analog signal range operation. Supply options include split rails of plus/minus 5 V to plus/minus 20 V, or a single positive supply of +5 V to +30 V, with a 15 V analog input range.
Internally the DG309CJ+ is a monolithic CMOS design. Each normally closed element places a pass transistor in the conducting path so the source and drain are bridged when the control input is low, which is why the part behaves as a shorting analog switch rather than a series isolator. That architecture makes it useful as a signal-shorting or bypass element in sample-and-hold circuits, guidance and control systems, communication systems, and test equipment, where a default connection must remain present when logic is unpowered or de-asserted.
Typical applications include heads-up display and military radio signal routing, PBX and PABX switching networks, guidance and control system multiplexing, sample-and-hold front ends, and general-purpose bench test switching. Because the closed state is the default, it is especially suitable for fail-safe signal paths where an open circuit would be more damaging than a shorted one.
When designing around the DG309CJ+, always verify the logic polarity of the control input for each channel and confirm that the maximum analog input voltage is not exceeded during transients. Because the package is a through-hole PDIP-16 rather than a surface-mount part, it is also easier to prototype and hand-solder, but requires plated through-holes and more board area than an equivalent surface-mount switch.
This page consolidates distributor pricing as of 2026-10-30, verified drop-in alternatives from Maxim, Vishay and Harris, and practical design notes that go beyond the raw parameter table in the manufacturer data sheet.
直接替换替代料： DG309CJ+ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
DG309CJ
✅ 直接替换📋 参考替代料（不在目录中）
DG308ACJ+
✅ 直接替换📋 参考替代料（不在目录中）
DG309CJ
✅ 直接替换📋 参考替代料（不在目录中）
DG309CJ-E3
✅ 直接替换📋 参考替代料（不在目录中）
DG309CJ
✅ 直接替换📋 参考替代料（不在目录中）
DG309CJ+ 最大额定值与电气特性
| Switch Type | SPST, Normally Closed (SPST-NC), 4 circuits |
| Number of Channels | 1 channel per switch, 4 switches per device |
| On-Resistance | 60 ohm typical (datasheet feature); 85 ohm listed by Harris/Vishay distributors, 100 ohm listed by Analog Devices distributors |
| Analog Input Range | 15 V maximum |
| Turn-On Time | Less than 120 ns |
| Turn-Off Time | Less than 90 ns |
| Switching Speed | 130 ns |
| Power Dissipation | 30 nW |
| Logic Compatibility | CMOS logic compatible |
| Signal Range | Full rail-to-rail analog signal range |
| Dual Supply Voltage Range | +/-5 V to +/-20 V |
| Single Supply Voltage Range | +5 V to +30 V |
| Maximum Dual Supply Voltage | +/-20 V |
| 封装 | PDIP-16 (0.300 inch / 7.62 mm pitch), plastic |
| 安装类型 | Through-hole |
| Technology | Monolithic CMOS |
| RoHS 状态 | unknown |
DG309CJ+ pdip-16 (0.300 inch / 7.62 mm pitch), plastic 引脚配置指南
DG309CJ+（pdip-16 (0.300 inch / 7.62 mm pitch), plastic 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： DG309CJ+.
请参阅 数据手册 以查看完整引脚配置。
典型应用
DG309CJ+ 适用于 6 应用s: Sample-and-Hold Front Ends, Guidance and Control Signal Routing, Military Radio and Heads-Up Display Interfacing, PBX and PABX Voice Path Switching, Test and Measurement Signal Bypass, Industrial Data Acquisition and Sensor Multiplexing.
Sample-and-Hold Front Ends
The DG309CJ+ suits sample-and-hold amplifier front ends because its normally closed default state keeps the holding capacitor path connected whenever the control line is idle or unpowered, avoiding the charge-loss risk of a normally open arrangement. The Maxim Integrated DG308A/DG309 data sheet lists sample-and-hold circuits as a primary application for this family. With 60 ohm on-resistance and turn-on time below 120 ns, the switch adds little aperture error to the acquisition instant, while the 30 nW dissipation keeps the leakage contribution of the closed channel negligible compared with the capacitor leakage in most medium-impedance designs. The 15 V analog input range covers bipolar and unipolar front ends driven from op-amp buffers such as the MC1458D or NE5534DR.
推荐
Guidance and Control Signal Routing
In guidance, navigation and industrial control systems the DG309CJ+ provides fast, low-loss routing of analog command and feedback signals between a controller and peripheral channels. Its 130 ns switching speed and sub-90 ns turn-off time allow the switch to be toggled at high enough rates for pulse and burst signal paths, and the 60 ohm on-resistance limits insertion loss on the closed channel. Because the switch is normally closed, it can also act as a default-connection element that ties a signal to a safe state when the controller resets. The monolithic CMOS construction provides consistent behavior over the plus/minus 5 V to plus/minus 20 V split-supply range used in defense and industrial avionics equipment.
推荐
Military Radio and Heads-Up Display Interfacing
The Maxim Integrated DG308A/DG309 product page explicitly targets military radios and heads-up displays, and the DG309CJ+ addresses those needs with a 15 V analog input range, full rail-to-rail signal handling and CMOS-compatible control logic that works from +5 V to +30 V single-supply operation. In a radio front end the normally closed switch can keep an antenna or filter path connected at all times, which is desirable when a transmitter is keyed or a display is refreshed at high rate. The small 30 nW dissipation per closed channel also matters in battery-powered portable radios, where standby leakage accumulates. Over the 16-pin PDIP footprint the part is also easy to retrofit onto legacy military and avionics boards that use through-hole footprints rather than fine-pitch surface-mount land patterns.
推荐
PBX and PABX Voice Path Switching
In PBX and PABX line-switching equipment, the DG309CJ+ acts as a low-loss, fast voice-path shunt element that can bypass or connect line circuits. Telecom line cards typically run on plus/minus 5 V to plus/minus 15 V rails, which falls inside the device's plus/minus 5 V to plus/minus 20 V split-supply capability, and the CMOS-compatible inputs allow direct drive from the line-card control logic without level translation. The 60 ohm on-resistance is low enough to preserve voice-band signal amplitude in shunt paths, and the 130 ns switching speed means call-setup routing can occur without audible clicks or distortion. The 16-pin PDIP package suits card-cage and backplane-style designs where through-hole soldering and field replacement are preferred over fine-pitch SMT assembly.
推荐
Test and Measurement Signal Bypass
Test and measurement equipment listed in the Maxim Integrated DG308A/DG309 application list makes good use of the DG309CJ+ as a signal bypass and shorting switch around sensitive front ends. When a measurement is in progress the normally closed state provides a defined, low-impedance connection, and the sub-120 ns turn-on allows the instrument to redirect the input quickly between test paths. The 30 nW dissipation contributes negligibly to offset error in high-impedance instrumentation, while the 60 ohm on-resistance keeps insertion loss acceptable for many millivolt-level signal chains. Because the part is a through-hole PDIP-16, it can also be socketed or adapted on legacy ATE and instrument boards, which simplifies service and calibration work in equipment originally designed with the Maxim DG309 family.
推荐
Industrial Data Acquisition and Sensor Multiplexing
Industrial data-acquisition and factory automation systems can use the DG309CJ+ as a quad signal-shorting element ahead of sensor channels, allowing inputs to be tied to a defined state during multiplexing transitions to prevent floating-node errors. The Maxim Integrated product guidance lists guidance and control systems among the target markets, and the device's 15 V analog input range comfortably covers 4-20 mA and 0-10 V industrial sensor signals after scaling. The 130 ns switching speed keeps multiplexing latency negligible relative to typical acquisition cycles, and CMOS logic compatibility lets the switch be driven directly from a microcontroller port without buffer amplifiers. The PDIP-16 through-hole package also suits ruggedized instrumentation panels where vibration-resistant soldering and manual rework are priorities.
推荐
推荐产品汇总
工程参考数据： DG309CJ+ ——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 | DG309CJ | DG308ACJ+ | DG309CJ | DG309CJ-E3 | DG309CJ |
|---|---|---|---|---|---|---|
| Package | PDIP-16 (0.300 inch, 7.62 mm) | PDIP-16 (0.300 inch, 7.62 mm) - same | PDIP-16 (0.300 inch, 7.62 mm) - same | PDIP-16 (0.300 inch, 7.62 mm) - same | PDIP-16 (0.300 inch, 7.62 mm) - same | PDIP-16 (0.300 inch, 7.62 mm) - same |
| Brand / Manufacturer | Maxim Integrated | Maxim Integrated - same | Maxim Integrated - same | Vishay Intertechnology | Vishay Intertechnology | Harris Corporation |
| Switch Configuration | Quad SPST, Normally Closed (NC) | Quad SPST, Normally Closed (NC) - same | Quad SPST, Normally Open (NO) - differs | Quad SPST, Normally Closed (NC) - same | Quad SPST, Normally Closed (NC) - same | Quad SPST, Normally Closed (NC) - same |
| On-Resistance | 60 ohm typical | 60 ohm typical - same | 60 ohm typical | 85 ohm (distributor listing) | 85 ohm (distributor listing) | 85 ohm (distributor listing) |
| Switching Speed | 130 ns | 130 ns - same | 130 ns | 130 ns | 130 ns | 130 ns |
| Analog Input Range | 15 V | 15 V - same | 15 V | 15 V | 15 V | 15 V |
| Supply Voltage Range | +/-5 V to +/-20 V split; +5 V to +30 V single | +/-5 V to +/-20 V split; +5 V to +30 V single - same | +/-5 V to +/-20 V split; +5 V to +30 V single | +/-5 V to +/-20 V split | +/-5 V to +/-20 V split | +/-5 V to +/-20 V split |
| Power Dissipation | 30 nW | 30 nW - same | 30 nW | 30 nW | 30 nW | 30 nW |
| Logic Compatibility | CMOS compatible | CMOS compatible - same | CMOS compatible | CMOS compatible | CMOS compatible | CMOS compatible |
关键差异点
- Normally closed default state preserves signal paths on power loss （对比 DG308ACJ+)
- Multiple independent sourcing channels in the same 16-PDIP footprint （对比 Vishay DG309CJ)
- Faster and lower-impedance switching than legacy relay-based paths （对比 Mechanical relay contact in legacy guidance and control racks)
设计说明
The single most common design error with the DG309CJ+ is confusing its normally closed default state with a normally open part such as the DG308ACJ+. Because the DG309CJ+ conducts when the control input is de-asserted, an unpowered or floating control line leaves the signal path closed. If your design expects isolation in the idle state, either invert the logic with a gate driver or choose the normally open DG308ACJ+ variant. Second, confirm the control logic polarity against the data sheet pin-configuration figure before finalizing the schematic, as a wrong assumption here can short a signal source to two destinations at once.
Treat the closed on-resistance as part of the signal path, not as an ideal short. With 60 ohm typical on-resistance, a 10 kohm source impedance produces about 1.2 dB of insertion loss on the closed channel, and the distributor-listed worst values of 85 to 100 ohm add another 0.3 to 0.5 dB. When driving high-impedance nodes this is usually harmless, but for low-impedance or precision divider networks, buffer the switch output with an op-amp such as the MC1458D. Also keep the analog input magnitude within the 15 V analog input range, and respect the rail-to-rail signal handling limits when driving near the supply rails.
Place the DG309CJ+ close to the signal source and return path so that the switching edges of the CMOS pass transistors do not pick up stray pickup on long traces. Keep the ground and supply connections short and provide local decoupling on the supply pins, since supply transients appear directly as output glitch on a low-impedance closed channel. Because the part is a through-hole PDIP-16, the lead spacing gives generous routing room, but keep the four control traces away from the analog source and drain traces to avoid capacitive coupling of the 130 ns switching edges into the signal path.
Estimated: with 30 nW dissipation per closed channel at typical signal levels, four closed channels dissipate roughly 120 nW, which is negligible compared with the package and board leakage budgets of most analog systems. The real constraint is supply current, not dissipation, so size the supply based on the control-logic static current rather than the analog path. Estimated: at a 15 V analog input with 60 ohm on-resistance, the closed channel conducts up to 250 mA, so confirm that the driven source can sink or source that current and that the upstream buffer is not the limiting element.
合规信息
No explicit RoHS, REACH or material-declaration statements appeared in the provided distributor listings, so all compliance fields are recorded as unknown. The Vishay DG309CJ-E3 alternate is a lead-free, RoHS-compliant-finish option per comparison listings. AEC-Q100 is not applicable to this industrial/telecom analog switch family.
