DG508AAK Equivalent & Substitute Parts

Part Overview

The DG508AAK is an 8:1 analog multiplexer/demultiplexer integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. This single-circuit switch device features 400Ohm on-state resistance and operates across a wide supply voltage range of ±4.5V to ±18V. The component is housed in a 16-CERDIP through-hole package and maintains Active product status with full RoHS3 compliance. Equivalent and substitute parts are identified when application requirements necessitate alternative sourcing due to inventory constraints, supply chain considerations, or specific performance parameter requirements within acceptable tolerance ranges.

Substiute Parts

DG508AAK

Analog Devices Inc./Maxim IntegratedIn Stock: 3509DG508AAK Datasheet

Current PartRFQ

MPC508AP

Texas InstrumentsIn Stock: 4340MPC508AP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DG508AAK is determined by strict adherence to the following critical parameters:

Functional Equivalence Requirements:

• Multiplexer/Demultiplexer configuration must be 8:1
• Single circuit topology (1 Circuit)
• Through-hole mounting compatibility

Electrical Compatibility Criteria:

• On-state resistance must not exceed 400Ohm maximum specification
• Dual supply voltage range must encompass ±4.5V to ±18V operation
• Channel capacitance values (CS(off) and CD(off)) must match or be lower
• Leakage current (IS(off)) must not exceed 500pA maximum

Environmental and Compliance Requirements:

• Operating temperature range must support -55°C to 125°C minimum
• RoHS3 compliance mandatory
• REACH Unaffected status required

The MPC508AP from Texas Instruments qualifies as a substitute based on matching 8:1 multiplexer configuration, single-circuit design, compatible dual supply voltage range (±5V ~ ±22V), identical channel capacitance specifications, and equivalent leakage current characteristics. Both components maintain RoHS3 compliance and REACH Unaffected status. Package compatibility is maintained through equivalent 16-pin DIP through-hole footprints.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection Criteria:

The DG508AAK remains the preferred component when the application requires the lower on-state resistance of 400Ohm and extended operating temperature range of -55°C to 125°C. This component is suitable for precision analog signal routing applications where resistance matching and thermal stability across wide temperature ranges are critical.

Substitute Selection Criteria:

The MPC508AP from Texas Instruments serves as a functional substitute when:

• Application operating temperature range does not exceed -40°C to 85°C
• Higher on-state resistance of 1.5kOhm is acceptable within circuit design parameters
• Faster switching times (200ns Ton, 250ns Toff) provide performance advantage
• Supply voltage operation within ±5V to ±22V range is available

Both components maintain identical RoHS3 compliance and REACH Unaffected status, ensuring regulatory compatibility. Pin-compatible 16-pin DIP through-hole packages enable direct board-level substitution without layout modification.

Inventory and Availability:

DG508AAK: 3421 Pcs New Original In Stock MPC508AP: 4272 Pcs New Original In Stock

Frequently Asked Questions (FAQ)

Q: Can the MPC508AP directly replace the DG508AAK in all applications?

A: Direct substitution is possible only when application requirements accommodate the higher on-state resistance (1.5kOhm vs. 400Ohm) and the narrower operating temperature range (-40°C to 85°C vs. -55°C to 125°C). Circuit analysis must confirm that the increased resistance does not degrade signal integrity or introduce unacceptable signal attenuation in the specific application.

Q: What is the significance of the on-state resistance difference between these parts?

A: The DG508AAK features 400Ohm on-state resistance while the MPC508AP has 1.5kOhm. This 3.75x difference affects signal attenuation, impedance matching, and power dissipation. Applications requiring low-impedance signal paths or precise analog signal routing should retain the DG508AAK. Applications with higher source impedance or less stringent signal integrity requirements may tolerate the MPC508AP.

Q: Are the packages truly interchangeable?

A: Both components use 16-pin through-hole DIP packages with 0.300" (7.62mm) spacing. The DG508AAK uses 16-CDIP while the MPC508AP uses 16-PDIP. These packages are mechanically and electrically compatible for standard through-hole PCB applications. Pin assignments must be verified against respective datasheets to ensure signal routing compatibility.

Q: What is the impact of the operating temperature range difference?

A: The DG508AAK operates from -55°C to 125°C while the MPC508AP operates from -40°C to 85°C. Applications requiring operation below -40°C or above 85°C must use the DG508AAK. Industrial and automotive applications with extended temperature requirements should specify the DG508AAK.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the DG508AAK and MPC508AP are RoHS3 compliant and REACH Unaffected. They carry identical regulatory status and may be used interchangeably from a compliance perspective.

Q: How do the switching times compare?

A: The MPC508AP offers faster switching performance with Ton of 200ns (typical) and Toff of 250ns (typical), compared to the DG508AAK with Ton of 1µs and Toff of 700ns. Applications requiring high-speed multiplexing benefit from the MPC508AP's faster switching characteristics.

Q: What does channel capacitance matching mean for substitution?

A: Both parts feature identical channel capacitance specifications: CS(off) of 5pF and CD(off) of 25pF. This ensures equivalent performance in applications sensitive to capacitive coupling and crosstalk. The matching capacitance values support direct substitution from a signal integrity perspective.