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DG418BAK Equivalent & Substitute Parts
Part Overview
The DG418BAK is a single-circuit SPST-NO (Single Pole Single Throw - Normally Open) analog switch manufactured by Vishay Siliconix, designed for interface applications requiring low on-state resistance switching. This component operates across a wide supply voltage range (13V to 36V single supply, or ±7V to ±22V dual supply) and features a maximum on-state resistance of 25Ohm with switching times of 89ns (turn-on) and 80ns (turn-off).
The DG418BAK is classified as obsolete. Locating equivalent or substitute components is necessary to support legacy system maintenance, design updates, or when inventory becomes unavailable. Substitute parts must maintain functional compatibility across critical electrical parameters including switch circuit topology, on-state resistance, supply voltage requirements, and package form factor.
Substiute Parts
Key Parameters
| Parameter | DG418BAK Value |
|---|---|
| Switch Circuit | SPST - NO |
| Multiplexer/Demultiplexer Circuit | 1:1 |
| Number of Circuits | 1 |
| On-State Resistance (Max) | 25Ohm |
| Voltage - Supply, Single (V+) | 13V ~ 36V |
| Voltage - Supply, Dual (V±) | ±7V ~ 22V |
| Switch Time (Ton, Toff) (Max) | 89ns, 80ns |
| Charge Injection | 38pC |
| Channel Capacitance (CS(off), CD(off)) | 12pF, 12pF |
| Current - Leakage (IS(off)) (Max) | 250pA |
| Operating Temperature | -55°C ~ 125°C (TA) |
| Package / Case | 8-CDIP (0.300", 7.62mm) |
| Product Status | Obsolete |
| RoHS Status | RoHS non-compliant |
Substitute Part Grouping Explanation
Substitution of the DG418BAK is evaluated based on the following critical parameters that define functional compatibility:
Topology Match: The substitute must maintain SPST-NO switch circuit configuration with 1:1 multiplexer/demultiplexer ratio and single circuit count.
On-State Resistance: The DG418BAK specifies a maximum on-state resistance of 25Ohm. Substitute parts with lower on-state resistance (such as 20Ohm) are acceptable as they provide improved performance characteristics while maintaining signal integrity in the same application context.
Supply Voltage Compatibility: The substitute must operate within voltage ranges that encompass or are compatible with the original part's supply requirements. The DG418BAK operates at 13V ~ 36V (single supply) or ±7V ~ 22V (dual supply). Substitutes with lower voltage ratings require application-level verification of compatibility.
Switching Performance: Switch times (Ton, Toff) and charge injection characteristics must be comparable to support equivalent signal fidelity and timing requirements.
Package Form Factor: Both parts must use through-hole mounting in 8-DIP/8-CDIP packages with 0.300" (7.62mm) spacing to ensure direct PCB compatibility.
Leakage Current: Lower leakage current in substitutes indicates improved performance and is acceptable.
The MAX4516CPA+ meets these substitution criteria with compatible topology, improved on-state resistance (20Ohm), and equivalent package form factor, though with different supply voltage specifications requiring application context verification.
Parameter Comparison
| Parameter | DG418BAK | MAX4516CPA+ | Compatibility Notes |
|---|---|---|---|
| Switch Circuit | SPST - NO | SPST - NO | Identical topology |
| Multiplexer/Demultiplexer Circuit | 1:1 | 1:1 | Identical configuration |
| Number of Circuits | 1 | 1 | Identical |
| On-State Resistance (Max) | 25Ohm | 20Ohm | Substitute has lower resistance (improved) |
| Voltage - Supply, Single (V+) | 13V ~ 36V | 2V ~ 12V | Different range; application-dependent |
| Voltage - Supply, Dual (V±) | ±7V ~ 22V | ±1V ~ 6V | Different range; application-dependent |
| Switch Time (Ton, Toff) (Max) | 89ns, 80ns | 100ns, 75ns | Comparable switching performance |
| Charge Injection | 38pC | 10pC | Substitute has lower charge injection (improved) |
| Channel Capacitance (CS(off), CD(off)) | 12pF, 12pF | 9pF, 9pF | Substitute has lower capacitance (improved) |
| Current - Leakage (IS(off)) (Max) | 250pA | 1nA | Substitute has lower leakage (improved) |
| Operating Temperature | -55°C ~ 125°C (TA) | 0°C ~ 70°C (TA) | Different range; application-dependent |
| Package / Case | 8-CDIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) | Compatible through-hole packages |
| Product Status | Obsolete | Active | Substitute is in active production |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant | Substitute meets current compliance standards |
Engineering Selection Recommendations
Product Status Consideration: The DG418BAK is obsolete, while the MAX4516CPA+ is in active production. Selection of an active-status component ensures long-term availability and supply chain stability for new designs or system updates.
Compliance and Certification: The MAX4516CPA+ is ROHS3 compliant, meeting current environmental and regulatory standards. The DG418BAK is RoHS non-compliant. For applications subject to modern procurement or environmental regulations, the MAX4516CPA+ is the appropriate choice.
Electrical Performance: The MAX4516CPA+ demonstrates improved electrical characteristics across multiple parameters: lower on-state resistance (20Ohm vs. 25Ohm), reduced charge injection (10pC vs. 38pC), lower channel capacitance (9pF vs. 12pF), and significantly lower leakage current (1nA vs. 250pA). These improvements enhance signal fidelity and reduce power consumption.
Supply Voltage Range: The MAX4516CPA+ operates at 2V ~ 12V (single supply) or ±1V ~ 6V (dual supply), which differs from the DG418BAK's 13V ~ 36V or ±7V ~ 22V ranges. Substitution is valid only for applications operating within the MAX4516CPA+ voltage specifications. Applications requiring the higher voltage range of the DG418BAK require alternative substitutes.
Operating Temperature Range: The DG418BAK supports -55°C ~ 125°C, while the MAX4516CPA+ supports 0°C ~ 70°C. Applications requiring extended temperature operation below 0°C or above 70°C must verify alternative substitutes.
Package Compatibility: Both components use through-hole 8-DIP packages with 0.300" (7.62mm) spacing, enabling direct PCB footprint compatibility.
Frequently Asked Questions (FAQ)
Q: Can the MAX4516CPA+ directly replace the DG418BAK in all applications?
A: Direct replacement is valid only when the application operates within the MAX4516CPA+ supply voltage range (2V ~ 12V single supply or ±1V ~ 6V dual supply) and operating temperature range (0°C ~ 70°C). Applications requiring the DG418BAK's higher voltage range or extended temperature operation require alternative substitutes. The improved electrical characteristics of the MAX4516CPA+ (lower on-state resistance, charge injection, and leakage current) are compatible with DG418BAK applications within these constraints.
Q: What is the significance of the on-state resistance difference (25Ohm vs. 20Ohm)?
A: The MAX4516CPA+ has a lower maximum on-state resistance of 20Ohm compared to the DG418BAK's 25Ohm. Lower on-state resistance reduces voltage drop across the switch during signal transmission, improving signal integrity and reducing power dissipation. This represents an improvement over the original part and is compatible with applications designed for the DG418BAK.
Q: Are the package dimensions identical between the DG418BAK and MAX4516CPA+?
A: Both components use through-hole 8-DIP packages with 0.300" (7.62mm) spacing. The DG418BAK is specified as 8-CDIP while the MAX4516CPA+ is specified as 8-PDIP. Both packages are mechanically compatible with standard 0.300" DIP footprints and can be used interchangeably on PCBs designed for this form factor.
Q: Why does the MAX4516CPA+ have a lower operating temperature range?
A: The MAX4516CPA+ is specified for 0°C ~ 70°C operation, while the DG418BAK supports -55°C ~ 125°C. This reflects different design specifications and intended application environments. Applications requiring operation below 0°C or above 70°C must use the DG418BAK or identify alternative substitutes with extended temperature ratings.
Q: What does RoHS compliance mean for component selection?
A: RoHS (Restriction of Hazardous Substances) compliance indicates that a component meets environmental standards restricting the use of specific hazardous materials. The MAX4516CPA+ is ROHS3 compliant, meeting current regulatory requirements. The DG418BAK is RoHS non-compliant. For new designs or applications subject to modern procurement standards, RoHS-compliant components are required.
Q: Is the charge injection difference (38pC vs. 10pC) significant?
A: Charge injection represents the amount of charge transferred to the signal path when the switch transitions. Lower charge injection (10pC in the MAX4516CPA+) reduces signal distortion and noise, particularly in precision analog applications. The MAX4516CPA+ provides improved performance in this parameter.
Q: Can I use the MAX4516CPA+ in a legacy system designed for the DG418BAK?
A: Substitution is valid if the system operates within the MAX4516CPA+ specifications: supply voltage range of 2V ~ 12V (single) or ±1V ~ 6V (dual), and operating temperature range of 0°C ~ 70°C. The improved electrical characteristics and package compatibility support direct substitution within these constraints. Systems operating outside these ranges require alternative substitutes.
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