DG419DJ+ - 35Ω Precision SPDT CMOS Switch | Analog Devices
MPN: DG419DJ+ ✓ ActiveDG419DJ+ Overview
An analog switch is a semiconductor device that connects or disconnects signal paths under digital control. The SPDT topology provides one common terminal and two switched terminals, making the DG419DJ+ useful for signal selection, polarity routing, test-point isolation, and channel multiplexing. In the broader hierarchy, it is an analog switch, an interface IC, and a discrete signal-routing function that complements power management, data converters, and communication components.
Key benefits include a maximum on-resistance of 35 Ω, bidirectional signal conduction, low charge injection, low power consumption, and ESD tolerance of at least 2000 V per Method 3015.7. The 44 V maximum supply rating gives the device useful headroom for dual-supply analog systems, while the VSS-to-VDD analog signal range supports switching across positive and negative rails. The package is an 8-pin PDIP, allowing conventional through-hole assembly rather than requiring a fine-pitch surface-mount footprint.
The DG419DJ+ is built around a monolithic CMOS analog-switch architecture. Its two throws provide complementary routing paths, while the control input determines which terminal is connected to the common node. Matching between the switched paths is important in precision systems because unequal resistance can create gain or attenuation differences after the signal changes direction. The family’s specified 3 Ω maximum matching therefore helps preserve channel consistency.
Typical uses include precision signal-path routing in test and measurement equipment, analog front-end channel selection, instrumentation multiplexing, and bipolar analog-signal switching. In a measurement circuit, the common terminal can be connected to either sensor or reference path. In a test system, it can isolate a device-under-test input while keeping the external node disconnected from the source.
Designers should account for the 35 Ω on-resistance when calculating signal attenuation, and should verify charge injection against the accuracy required by the selected amplifier or converter. Supply bypassing and control-signal timing also require attention because the CMOS switch and surrounding analog circuitry must remain stable across the intended signal and common-mode ranges.
This page consolidates the verified manufacturer information, distributor availability data, package details, parameter comparisons, and practical switching considerations. It also separates confirmed DG419 family characteristics from parameters that were not available in the supplied source data, helping engineers evaluate the DG419DJ+ without relying on unverified specifications.
Drop-in alternatives for DG419DJ+ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
DG419CJ+
✅ Drop-In📋 Reference alternative (not in catalog)
DG419CJ
✅ Drop-In📋 Reference alternative (not in catalog)
DG419DJ
✅ Drop-In📋 Reference alternative (not in catalog)
DG419DJ
✅ Drop-In📋 Reference alternative (not in catalog)
DG419CJ+
✅ Drop-In📋 Reference alternative (not in catalog)
DG419DJ+ Maximum Ratings & Electrical Characteristics
| Switch Type | SPDT |
| Number of Circuits | 1 circuit |
| Switch Configuration | 2:1 |
| On-Resistance | 35 Ω maximum |
| On-Resistance Matching | 3 Ω maximum between switches |
| On-Resistance Flatness | 4 Ω maximum over the signal range |
| Technology | Monolithic CMOS |
| Maximum Supply Voltage | 44 V |
| Analog Signal Range | VSS to VDD |
| Power Dissipation | Less than 35 µW |
| ESD Tolerance | At least 2000 V per Method 3015.7 |
| Charge Injection | Low; numerical value not provided in verified data |
| Signal Conduction | Equal in either direction |
| Package | 8-pin PDIP |
| Mounting Type | Through-hole |
DG419DJ+ Pin Configuration
| Pin 1 | COM — Common terminal of the SPDT switch |
| Pin 2 | NO1 — Normally open switched terminal |
| Pin 3 | NC — Not connected |
| Pin 4 | VSS — Negative supply terminal |
| Pin 5 | NC — Not connected |
| Pin 6 | NO2 — Normally open switched terminal |
| Pin 7 | VDD — Positive supply terminal |
| Pin 8 | IN — Digital control input |
Typical Applications
DG419DJ+ is suitable for 6 applications: Precision Instrumentation Signal Routing, Analog Front-End Channel Multiplexing, Bipolar Test-Point Isolation, Precision Signal-Path Multiplexing, Sensor Signal Selection, Reference and Signal Cross-Connect.
Precision Instrumentation Signal Routing
The DG419DJ+ fits precision instrumentation that must route one analog signal between two sources or destinations. Its single SPDT topology provides a common node and two throws, while the DG419 family specification of 3 Ω maximum on-resistance matching limits path-dependent gain differences. The 35 Ω maximum on-resistance should be included in the signal-chain error budget, especially when driving a high-impedance amplifier. Used with suitable supply bypassing, the switch supports bipolar VSS-to-VDD signal ranges and low power dissipation of less than 35 µW.
Recommended
Analog Front-End Channel Multiplexing
The DG419DJ+ can select one of two sensor or conditioning paths at the input of an analog front end. The common terminal connects to the downstream amplifier or converter, while the control input selects either throw. Guaranteed on-resistance matching of 3 Ω maximum helps prevent one source path from carrying materially more insertion loss than the other. Because the switch contributes up to 35 Ω of series resistance, the design should account for loading, source impedance, bandwidth, and any input capacitance before assigning gain or accuracy budgets.
Recommended
Bipolar Test-Point Isolation
The DG419DJ+ is useful for test-point isolation in mixed-signal systems where a measurement node must be disconnected from an active circuit. Its SPDT arrangement can connect the common test terminal to either the circuit under test or a bias or reference path, while the CMOS switch provides equal conduction in either direction. The verified 44 V maximum supply rating supports positive and negative supply arrangements. Engineers should verify leakage, charge injection, switching transients, and control timing for the specific measurement accuracy because numerical values for those parameters were not supplied.
Recommended
Precision Signal-Path Multiplexing
The DG419DJ+ can multiplex two analog sources into one downstream signal path when channel consistency is more important than minimum resistance. Its 35 Ω maximum on-resistance is predictable, and the family specification provides both 3 Ω maximum matching and 4 Ω maximum flatness over the signal range. Those characteristics can reduce channel-to-channel variation in instrumentation. Designers should still include the switch resistance and downstream amplifier input impedance in their attenuation calculation, and should confirm bandwidth and capacitance limits from the complete DG419 datasheet before using the switch in high-bandwidth paths.
Recommended
Sensor Signal Selection
The DG419DJ+ can select between two sensor outputs or excitation paths in a compact industrial or medical measurement system. Its monolithic CMOS implementation and less-than-35 µW power dissipation limit the added power demand of the routing function. The 3 Ω maximum on-resistance matching helps preserve consistency when the downstream converter changes gain or offset calibration according to the selected sensor. Actual sensor suitability depends on source impedance, common-mode range, leakage, switching transients, and the required sampling time, none of which can be fully assessed from the supplied verified data.
Recommended
Reference and Signal Cross-Connect
The DG419DJ+ fits cross-connect circuits that route either a reference signal or a working signal to a shared measurement chain. The common terminal can be switched between the two throws using the digital control input, and the equal bidirectional conduction characteristic supports signal flow in either direction. Its 8-pin PDIP package also simplifies prototype assembly and rework. For precision references, verify charge injection and off-state leakage against the required resolution; the verified family description confirms that charge injection is low but does not provide a numerical limit in the supplied sources.
Recommended
Recommended Products Summary
Engineering reference data for DG419DJ+ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DG419CJ+ | DG419CJ | DG419DJ | DG419DJ | DG419CJ+ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Vishay Intertechnology | Vishay Intertechnology |
| Package | 8-pin PDIP | 8-pin PDIP | 8-pin PDIP | 8-pin PDIP | 8-pin PDIP | 8-pin PDIP |
| Switch Type | SPDT | SPDT | SPDT | SPDT | SPDT | SPDT |
| Number of Circuits | 1 | 1 | 1 | 1 | 1 | 1 |
| Switch Configuration | 2:1 | 2:1 | 2:1 | 2:1 | 2:1 | 2:1 |
| Maximum On-Resistance | 35 Ω | 35 Ω | 35 Ω | 35 Ω | 35 Ω | 35 Ω |
| On-Resistance Matching | 3 Ω maximum | 3 Ω maximum | 3 Ω maximum | 3 Ω maximum | 3 Ω maximum | 3 Ω maximum |
| On-Resistance Flatness | 4 Ω maximum over signal range | 4 Ω maximum over signal range | 4 Ω maximum over signal range | 4 Ω maximum over signal range | 4 Ω maximum over signal range | 4 Ω maximum over signal range |
| Maximum Supply Voltage | 44 V | 44 V | 44 V | 44 V | 44 V | 44 V |
| Power Dissipation | Less than 35 µW | Less than 35 µW | Less than 35 µW | Less than 35 µW | Less than 35 µW | Less than 35 µW |
| Technology | Monolithic CMOS | Monolithic CMOS | Monolithic CMOS | Monolithic CMOS | Monolithic CMOS | Monolithic CMOS |
Key Differentiators
- Guaranteed resistance consistency between switched paths (vs ADG419-EP)
- Documented 8-pin PDIP implementation (vs ADG419-EP)
- Low 35 Ω maximum on-resistance with matched paths (vs Generic SPST analog switch)
- Bipolar 44 V maximum supply capability (vs ADG419-EP)
Design Notes
Include the DG419DJ+ on-resistance in the complete insertion-loss calculation because the verified maximum is 35 Ω. For a source resistance of RS and load resistance of RL, the voltage-divider ratio must include the switch resistance during the selected state. Use the 3 Ω maximum matching guarantee when allocating channel-to-channel error, but do not assume that matching eliminates switch resistance. Confirm bandwidth, capacitance, leakage, and charge-injection values from the complete manufacturer datasheet before setting precision timing or gain limits.
The verified family power dissipation is less than 35 µW, but the actual dissipated power still depends on supply voltage, selected-path resistance, and the control state. Place the switch close to the protected circuit so that the switched node does not become a long antenna or pickup path. Use separate, low-impedance bypass connections to VDD and VSS as specified by the manufacturer application guidance. Because the exact recommended capacitor values were not present in the supplied data, do not select them from an unrelated switch family.
For this 8-pin PDIP device, maintain a clear return path from each supply pin to the analog ground reference and route the common and throw traces away from high-current switching nodes. Keep the control trace short enough to avoid false switching during transitions, and do not route the IN connection adjacent to sensitive analog traces unless the board stackup provides adequate separation. Verify the final pin orientation against the official PDIP drawing and the DG419 pinout, especially on boards shared with DIP-compatible alternatives.
Do not substitute a generic SPDT switch solely because its pin count and nominal resistance look similar. The DG419DJ+ supports analog signals from VSS to VDD, has a 44 V maximum supply rating, and specifies on-resistance matching and flatness across the signal range. Before approving a replacement, verify control polarity, supply arrangement, maximum analog signal voltage, leakage, charge injection, switching time, operating temperature, lifecycle status, and AEC-Q100 requirements where applicable.
Compliance Information
The supplied verified sources do not explicitly state DG419DJ+ compliance status. No RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals claim has been inferred.