DG408DJ+ - 8-Channel 100Ω CMOS Analog Mux | Analog Devices
MPN: DG408DJ+ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.99 | $4.99 |
| 10 | $4.75 | $47.50 |
| 100 | $4.25 | $425.00 |
| 500 | $3.95 | $1,975.00 |
| 1,000 | $3.7 | $3,700.00 |
DG408DJ+ Overview
An analog multiplexer is a semiconductor switching network that routes multiple analog inputs onto a shared output path. The DG408DJ+ belongs to the analog switch and multiplexer hierarchy and combines eight switch elements, TTL/CMOS-compatible channel decoding, and device-enable control in one integrated circuit. This integration reduces discrete switching hardware in data-acquisition, test, communication, guidance, and control systems.
The verified product information identifies a nominal 100 ohm on-resistance, 15 pC maximum charge injection, and input off-leakage below 5 nA at 85°C. Its equal bidirectional conduction makes the device suitable for routing signals where the source and destination roles can change. The three address inputs determine the selected channel, while the enable control allows the device to be removed from active service without changing the board interface.
The DG408DJ+ is identified as an improved member of the DG408 family and as a pin-compatible upgrade for the industry-standard DG408. Analog Devices lists audio-signal routing, communication systems, data acquisition, guidance and control systems, sample-and-hold circuits, and test equipment among its applications. These uses illustrate why switching bandwidth, on-resistance, leakage, and control compatibility must be evaluated together.
A primary design advantage is the ability to consolidate an eight-way analog routing matrix into one 16-pin IC. Logic-grounded address and enable signals control the selected path, while the common analog node reduces the number of external routing connections. Engineers should still verify signal amplitude, bandwidth, settling behavior, supply requirements, and all device limits against the current Analog Devices datasheet before releasing a production design.
When sourcing a replacement, preserve the 16-pin PDIP footprint and confirm pin-level compatibility rather than relying only on the DG408 family name. Similar multiplexers can differ in address decoding, enable polarity, injection, leakage, supply range, and electrical performance. The official Analog Devices product page and datasheet remain the controlling sources for those details.
This page combines verified distributor availability, manufacturer documentation, functional application analysis, and same-footprint replacement guidance. It is intended to help engineers identify the DG408DJ+, locate its documentation, understand its multiplexing role, and plan a technically defensible sourcing or replacement decision.
Drop-in alternatives for DG408DJ+ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DG408DJ
✅ Drop-In📋 Reference alternative (not in catalog)
DG408DJZ
✅ Drop-In📋 Reference alternative (not in catalog)
DG408DJ-E3
✅ Drop-In📋 Reference alternative (not in catalog)
DG408A
✅ Drop-In📋 Reference alternative (not in catalog)
DG508A
✅ Drop-In📋 Reference alternative (not in catalog)
DG408DJ+ Specifications
| Product Type | 8-channel single-ended CMOS analog multiplexer |
| Multiplexer Configuration | 8:1 |
| On-Resistance | 100 ohm |
| Number of Channels | 8 channels |
| Address Inputs | 3 binary inputs: A0, A1, A2 |
| Maximum Charge Injection | 15 pC |
| Input Off-Leakage Current | Less than 5 nA at 85°C |
| Signal Conduction | Bidirectional |
| Device Selection | ENABLE input supported |
| Package | 16-pin PDIP |
| Pin Count | 16 pins |
| Mounting Type | Through-hole dual in-line package |
| Technology | CMOS |
| Logic Compatibility | TTL/CMOS compatible channel selection |
| Operational Mode | Multiplexer; can also be used as a demultiplexer |
| Production Status | PRODUCTION |
DG408DJ+ 16-pin pdip Pin Configuration Guide
Pin configuration for DG408DJ+ (16-pin pdip package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for DG408DJ+.
Refer to the datasheet for full pin configuration.
Typical Applications
DG408DJ+ is suitable for 6 applications: Data Acquisition Systems, Sample-and-Hold Circuits, Audio-Signal Routing, Test and Measurement Equipment, Guidance and Control Systems, Communication Signal Routing.
Data Acquisition Systems
The DG408DJ+ fits eight-source data-acquisition front ends by connecting one of eight analog inputs to a shared measurement path through its 8:1 topology and three binary address inputs, A0, A1, and A2. The verified 100 ohm on-resistance is useful when the source impedance and acquisition time are designed together, while enable control allows unused acquisition intervals to isolate the selected path. Engineers should place the device close to the multiplexer output, keep return paths continuous, and account for the 15 pC maximum charge injection. Because the supplied extract does not specify switching time, channel capacitance, bandwidth, or operating voltage, those values must be checked in the current Analog Devices datasheet before choosing sample rate and acquisition timing.
Recommended
Sample-and-Hold Circuits
In a sample-and-hold system, the DG408DJ+ can route one of eight source signals into a common hold-path node while A0, A1, and A2 select the channel. Its verified 15 pC maximum charge injection is the principal acquisition-error consideration because injected charge must be absorbed by the source impedance and downstream capacitance. The enable input provides additional control when multiple multiplexers share a measurement system. Use short, guarded analog traces and a low-impedance acquisition node, then validate settling against the actual source resistance. Operating voltage, bandwidth, switching time, and capacitance limits were not included in the verified extract and must be obtained from the manufacturer datasheet before final timing calculations.
Recommended
Audio-Signal Routing
Analog Devices explicitly lists audio-signal routing as a DG408 family application, and the DG408DJ+ can select one of eight analog sources for a shared audio-processing path. Bidirectional conduction gives the circuit flexibility when source and destination roles change. The verified 100 ohm on-resistance is a key design input because it interacts with source and load impedance, producing avoidable signal attenuation or level-dependent transfer behavior. For high-fidelity audio, keep the common analog trace short, maintain a low-impedance ground reference, and isolate digital address traces from the selected channel. Bandwidth, total harmonic distortion, off-impedance, supply range, and channel isolation are not present in the supplied data, so they require confirmation from the official datasheet before defining an audio performance target.
Recommended
Test and Measurement Equipment
The DG408DJ+ can reduce the component count in test equipment by selecting among eight instrumentation or stimulus sources with one analog routing device. The three address lines and enable input provide straightforward digital control from a test controller, while the 8:1 topology lets a common ADC, comparator, or measurement amplifier process the selected signal. A practical layout should separate control traces from sensitive inputs, use a single low-impedance return, and verify that unused-channel loading does not distort the result. The verified data establishes channel count, topology, on-resistance, charge injection, leakage, and package, but does not provide bandwidth or isolation figures. Those omissions prevent a complete error budget and must be resolved from the manufacturer documentation.
Recommended
Guidance and Control Systems
The eight-channel structure fits guidance and control equipment that accepts multiple analog command, feedback, or sensor inputs and presents them to a shared processing channel. The DG408DJ+ offers deterministic channel selection through A0, A1, and A2, with enable available for system coordination. Designers should account for the verified 15 pC maximum charge injection when sensing rapidly changing or high-impedance feedback signals, and should keep switching transients away from precision references and analog returns. The supplied source does not establish supply voltage, temperature range, propagation delay, or isolation, so suitability for safety-critical or harsh environments cannot be inferred. Qualification and timing requirements must be checked against the exact ordering code and current Analog Devices documentation.
Recommended
Communication Signal Routing
Analog Devices identifies communication systems as a DG408 application, where the DG408DJ+ can choose among eight analog channels for a shared transmit, receive, monitoring, or test path. Bidirectional conduction supports flexible routing, but the verified 100 ohm on-resistance must be included in the channel loss and impedance budget. High-speed designs should minimize trace length, maintain uninterrupted return paths, and separate A0, A1, A2, and enable routing from sensitive analog nets. The provided results do not state bandwidth, off-impedance, switching time, supply range, or channel isolation, so the part should not be treated as suitable for a particular communication standard without those measurements. Validate insertion loss, return loss, settling, and crosstalk on the intended board configuration.
Recommended
Recommended Products Summary
Engineering reference data for DG408DJ+ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DG408DJ | DG408DJZ | DG408DJ-E3 | DG508A |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Renesas Electronics |
| Package | 16-pin PDIP | 16-pin PDIP | 16-pin PDIP | 16-pin PDIP | 16-pin PDIP |
| Multiplexer Configuration | 8:1 single-ended | 8:1 single-ended | 8:1 single-ended | 8:1 single-ended | 8-channel legacy replacement class |
| Address Control | 3 binary inputs | 3 binary inputs | 3 binary inputs | 3 binary inputs | 3 binary channel-selection inputs |
| Enable Control | ENABLE input | ENABLE input | ENABLE input | ENABLE input | ENABLE input |
| Technology | CMOS | CMOS | CMOS | CMOS | CMOS |
Key Differentiators
- Improved DG408 family positioning (vs DG408A)
- Explicit 100 ohm on-resistance verification (vs DG408DJ)
- Bidirectional 8-channel routing (vs DG508A)
- Low verified off-state leakage (vs DG408DJZ)
Design Notes
Place the 16-pin PDIP close to the routed analog source and destination so the common output path remains short. Keep A0, A1, A2, and enable traces away from high-impedance inputs, use a continuous ground plane, and route switched channels away from precision clocks and references. Because the verified on-resistance is 100 ohm, trace resistance and leakage into high-impedance sources can materially alter the usable transfer function; validate source and load impedances against the datasheet model.
Do not infer pin compatibility solely from the 8-channel description. Confirm pin 1 orientation, address truth table, enable polarity, supply connections, input and output pins, and ground locations in the current manufacturer datasheet. The provided extract confirms a 16-pin PDIP but omits the full pin table, so an incorrect socket wiring can disable the wrong channel or violate an absolute-maximum rating. Complete the schematic review against the exact ordering suffix before fabrication.
For acquisition and sample-and-hold paths, include the verified maximum charge injection of 15 pC in the error budget. Estimated: charge-induced voltage error equals injected charge divided by effective node capacitance, so increasing node capacitance may reduce the immediate voltage step but can also slow settling. These calculations must be validated using the datasheet switch capacitance, on-resistance, source resistance, and timing limits, none of which were included in the supplied data.
Route the IC supply and ground pins through short, low-impedance paths and place the manufacturer's required bypass capacitors directly at the pins. Avoid sharing narrow supply necks with digital control returns. Supply limits and recommended capacitor values were not present in the verified extract, so use the official datasheet rather than generic values; insufficient bypassing can produce channel-dependent errors that appear as analog noise or timing instability.
Compliance Information
The supplied product, distributor, and cross-reference data do not explicitly state DG408DJ+ compliance status. Ordering-suffix-specific declarations must be obtained from Analog Devices.