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DG190AP Equivalent & Substitute Parts
Part Overview
The DG190AP is a 2-circuit SPDT (Single Pole Double Throw) analog switch manufactured by Vishay Siliconix, designed for signal routing and multiplexing applications in analog systems. This component features dual 2:1 multiplexer/demultiplexer circuits with 30Ohm on-state resistance and operates across a wide temperature range of -55°C to 125°C. The DG190AP is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, design updates, and procurement continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Switch Circuit Configuration | SPDT (Single Pole Double Throw) |
| Number of Circuits | 2 |
| Multiplexer/Demultiplexer Circuit | 2:1 |
| On-State Resistance (Max) | 30Ohm |
| Voltage Supply - Dual (V±) | ±15V |
| Switch Time - Ton/Toff (Max) | 150ns / 130ns |
| Channel Capacitance (CS(off) / CD(off)) | 9pF / 6pF |
| Current Leakage (IS(off)) (Max) | 1nA |
| Operating Temperature Range | -55°C to 125°C |
| Package / Case | 16-DIP (0.300", 7.62mm) |
| Mounting Type | Through Hole |
| RoHS Status | RoHS non-compliant |
Substitute Part Grouping Explanation
Substitution of the DG190AP is determined by strict alignment of the following critical parameters:
Primary Substitution Criteria:
- Switch circuit type: SPDT configuration
- Circuit count: 2 independent circuits
- Multiplexer ratio: 2:1
- Package type: 16-DIP form factor with 0.300" (7.62mm) pitch
- Mounting method: Through-hole compatibility
Secondary Compatibility Parameters:
- On-state resistance: Maximum 35Ohm (allowing up to 5Ohm increase from 30Ohm baseline)
- Supply voltage compatibility: Dual supply operation (±V range)
- Switch timing: Ton/Toff within acceptable operating margins
- Operating temperature: Minimum -55°C to 125°C range coverage
- Leakage current: Acceptable for signal integrity in target application
The MAX303CPE+ meets all primary substitution criteria and maintains functional equivalence within the secondary parameter tolerances established for this component category.
Parameter Comparison
| Parameter | DG190AP | MAX303CPE+ | Compatibility Notes |
|---|---|---|---|
| Switch Circuit | SPDT | SPDT | Identical configuration |
| Number of Circuits | 2 | 2 | Identical circuit count |
| Multiplexer/Demultiplexer Circuit | 2:1 | 2:1 | Identical multiplexing ratio |
| On-State Resistance (Max) | 30Ohm | 35Ohm | 5Ohm increase acceptable for most applications |
| Voltage Supply - Dual (V±) | ±15V | ±4.5V to ±20V | DG190AP ±15V operation within MAX303CPE+ range |
| Switch Time - Ton (Max) | 150ns | 150ns | Identical maximum turn-on time |
| Switch Time - Toff (Max) | 130ns | 100ns | MAX303CPE+ faster turn-off improves performance |
| Channel Capacitance - CS(off) | 9pF | 12pF | 3pF increase; acceptable for most signal routing |
| Channel Capacitance - CD(off) | 6pF | 12pF | 6pF increase; verify for high-frequency applications |
| Current Leakage (IS(off)) (Max) | 1nA | 500pA | MAX303CPE+ exhibits lower leakage current |
| Operating Temperature Range | -55°C to 125°C | 0°C to 70°C | MAX303CPE+ has narrower range; verify application requirements |
| Package / Case | 16-DIP (0.300", 7.62mm) | 16-DIP (0.300", 7.62mm) | Identical package footprint and pinout |
| Mounting Type | Through Hole | Through Hole | Direct PCB compatibility |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant | MAX303CPE+ meets modern environmental standards |
Engineering Selection Recommendations
MAX303CPE+ as Primary Substitute:
The MAX303CPE+ manufactured by Analog Devices Inc./Maxim Integrated is the recommended equivalent for DG190AP replacement. This substitution is based on:
- Identical SPDT 2-circuit 2:1 multiplexer architecture
- Matching 16-DIP through-hole package with identical pinout
- Functional parameter alignment within acceptable engineering tolerances
- Active product status ensuring long-term availability and supply chain stability
- ROHS3 compliance supporting modern manufacturing and environmental requirements
- Improved electrical performance characteristics (lower leakage current, faster turn-off time)
Critical Consideration:
The MAX303CPE+ operating temperature range (0°C to 70°C) is narrower than the DG190AP range (-55°C to 125°C). Applications requiring operation below 0°C or above 70°C must verify alternative solutions or confirm that the MAX303CPE+ temperature limits are acceptable for the specific deployment environment.
Frequently Asked Questions (FAQ)
Q: Can MAX303CPE+ directly replace DG190AP without PCB modifications?
A: Yes. Both components use identical 16-DIP (0.300", 7.62mm) through-hole packages with matching pinouts. Direct socket substitution is possible without PCB redesign.
Q: What is the impact of the 5Ohm on-state resistance increase (30Ohm to 35Ohm)?
A: The resistance increase affects signal attenuation and power dissipation in analog switching applications. For most signal routing and multiplexing functions, this 16.7% increase is within acceptable tolerances. Applications with strict impedance matching or high-current switching should perform circuit analysis to confirm compatibility.
Q: Why does MAX303CPE+ have higher channel capacitance values?
A: The increased capacitance (CS(off) from 9pF to 12pF; CD(off) from 6pF to 12pF) may affect high-frequency performance and signal integrity. For applications operating above 1MHz, verify that the capacitance increase does not degrade bandwidth or introduce unacceptable signal distortion.
Q: Is the narrower operating temperature range of MAX303CPE+ a limitation?
A: The MAX303CPE+ operates from 0°C to 70°C, compared to DG190AP's -55°C to 125°C range. This is a significant constraint for applications requiring extended temperature operation. Confirm that your system operates within the 0°C to 70°C window before substitution.
Q: What are the advantages of MAX303CPE+ over DG190AP?
A: The MAX303CPE+ offers lower leakage current (500pA vs. 1nA), faster turn-off time (100ns vs. 130ns), ROHS3 compliance, and active product status with guaranteed long-term availability. These improvements enhance system performance and support modern manufacturing standards.
Q: Are there any supply voltage compatibility issues?
A: No. The DG190AP operates at ±15V dual supply, which falls within the MAX303CPE+ operating range of ±4.5V to ±20V. Existing power supply configurations require no modification.
Q: What packaging options are available for MAX303CPE+?
A: The MAX303CPE+ is supplied in Tube packaging. Verify that your procurement and assembly processes accommodate this packaging format.
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