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DG201ADY Equivalent & Substitute Parts
Part Overview
The DG201ADY is a 4-circuit SPST-NC (Single Pole Single Throw - Normally Closed) analog switch IC manufactured by Analog Devices Inc./Maxim Integrated in 16-SOIC surface mount packaging. This device features 200Ohm on-state resistance and operates across dual supply voltages of ±4.5V to ±18V, making it suitable for precision signal switching applications in audio, instrumentation, and data acquisition systems.
The DG201ADY is classified as obsolete, which necessitates identification of functionally equivalent alternatives. Active substitute parts are available from both Analog Devices and Vishay Siliconix that maintain core switching functionality while offering improved electrical performance characteristics and current manufacturing support.
Substiute Parts
Key Parameters
| Parameter | DG201ADY | Unit |
|---|---|---|
| Switch Circuit Type | SPST - NC | — |
| Number of Circuits | 4 | — |
| Multiplexer/Demultiplexer Circuit | 1:1 | — |
| On-State Resistance (Max) | 200 | Ohm |
| Voltage - Supply, Dual (V±) | ±4.5V ~ ±18V | V |
| Switch Time (Ton, Toff) Max | 600, 450 | ns |
| Charge Injection | 20 | pC |
| Channel Capacitance (CS(off), CD(off)) | 5, 5 | pF |
| Current - Leakage (IS(off)) Max | 5 | nA |
| Crosstalk | -90 | dB @ 100kHz |
| Operating Temperature | -40°C ~ 85°C | — |
| Package / Case | 16-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| Product Status | Obsolete | — |
| RoHS Status | RoHS non-compliant | — |
Substitute Part Grouping Explanation
Substitution of the DG201ADY is determined by strict adherence to the following electrical and mechanical parameters:
Core Compatibility Requirements:
- Switch circuit type: SPST - NC (mandatory)
- Number of circuits: 4 (mandatory)
- Multiplexer configuration: 1:1 (mandatory)
- Package type: 16-SOIC surface mount (mandatory)
- Operating temperature range: -40°C ~ 85°C (mandatory)
- Mounting type: Surface Mount (mandatory)
Electrical Performance Parameters (allowable variation):
- On-state resistance: 50Ohm to 200Ohm maximum
- Dual supply voltage range: Must encompass or overlap ±4.5V ~ ±18V
- Switch time: Lower values acceptable (faster switching)
- Charge injection: Lower values acceptable (reduced signal distortion)
- Leakage current: Lower values acceptable (improved isolation)
- Crosstalk: More negative values acceptable (better channel isolation)
Packaging and Compliance:
- All substitute parts are available in active production status
- RoHS3 compliance is preferred for modern applications
- Moisture sensitivity level remains MSL 1 (Unlimited) across all variants
Substitute parts are grouped by on-state resistance performance tier: 200Ohm (direct replacement), 90Ohm (improved performance), 85Ohm (improved performance), and 50Ohm (premium performance).
Parameter Comparison
| Part Number | Manufacturer | On-State Resistance (Ohm) | Dual Supply (V±) | Switch Time Ton/Toff (ns) | Charge Injection (pC) | Leakage Current (nA) | Crosstalk (dB @ 100kHz) | Status | RoHS | Packaging |
|---|---|---|---|---|---|---|---|---|---|---|
| DG201ADY | Analog Devices/Maxim | 200 | ±4.5V ~ ±18V | 600, 450 | 20 | 5 | -90 | Obsolete | Non-compliant | Tube |
| DG201ADY+ | Analog Devices/Maxim | 200 | ±4.5V ~ ±18V | 600, 450 | 20 | 5 | -90 | Active | ROHS3 Compliant | Tube |
| ADG201AKRZ | Analog Devices | 90 | ±10V ~ ±15V | 300, 250 | 20 | 2 | -80 | Active | ROHS3 Compliant | Tube |
| ADG201AKRZ-REEL | Analog Devices | 90 | ±10V ~ ±15V | 300, 250 | 20 | 2 | -80 | Active | ROHS3 Compliant | Tape & Reel |
| ADG201AKRZ-REEL7 | Analog Devices | 90 | ±10V ~ ±15V | 300, 250 | 20 | 2 | -80 | Active | ROHS3 Compliant | Cut Tape & Digi-Reel |
| ADG201HSKRZ | Analog Devices | 50 | ±14.6V ~ ±16.5V | 50, 50 | 10 | 1 | -86 | Active | ROHS3 Compliant | Tube |
| ADG201HSKRZ-REEL | Analog Devices | 50 | ±14.6V ~ ±16.5V | 50, 50 | 10 | 1 | -86 | Active | ROHS3 Compliant | Cut Tape & Digi-Reel |
| DG201BDY-E3 | Vishay Siliconix | 85 | ±4.5V ~ ±22V | 300, 200 | 1 | 0.5 | -95 | Active | ROHS3 Compliant | Tube |
| DG201BDY-T1-E3 | Vishay Siliconix | 85 | ±4.5V ~ ±22V | 300, 200 | 1 | 0.5 | -95 | Active | ROHS3 Compliant | Tape & Reel |
| DG201HSDY-E3 | Vishay Siliconix | 50 | ±7V ~ ±22V | 60, 50 | -5 | 1 | -100 | Active | ROHS3 Compliant | Tube |
| DG201HSDY-T1-E3 | Vishay Siliconix | 50 | ±7V ~ ±22V | 60, 50 | -5 | 1 | -100 | Active | ROHS3 Compliant | Tape & Reel |
Engineering Selection Recommendations
Direct Replacement (200Ohm On-State Resistance): DG201ADY+ is the direct active equivalent of the obsolete DG201ADY. It maintains identical electrical specifications while achieving ROHS3 compliance and active production status. This part is recommended for applications where the 200Ohm on-state resistance is a design requirement and supply voltage range of ±4.5V to ±18V is required.
Improved Performance Alternatives (85Ohm On-State Resistance): DG201BDY-E3 and DG201BDY-T1-E3 (Vishay Siliconix) offer reduced on-state resistance of 85Ohm with superior electrical characteristics including lower charge injection (1pC vs. 20pC), significantly lower leakage current (0.5nA vs. 5nA), and improved crosstalk isolation (-95dB vs. -90dB). These parts support a wider dual supply range of ±4.5V to ±22V and are available in both tube and tape & reel packaging. Selection between tube and tape & reel depends on assembly volume requirements.
High-Performance Alternatives (90Ohm On-State Resistance): ADG201AKRZ series (Analog Devices) provides 90Ohm on-state resistance with improved leakage current (2nA) and faster switching times (300ns, 250ns). These parts operate within a narrower dual supply range of ±10V to ±15V. Available in tube, tape & reel, and cut tape & digi-reel packaging options.
Premium Performance Alternatives (50Ohm On-State Resistance): ADG201HSKRZ and DG201HSDY-E3 series deliver the lowest on-state resistance at 50Ohm with fastest switching performance (50ns) and minimal leakage current (1nA). ADG201HSKRZ operates at ±14.6V to ±16.5V, while DG201HSDY-E3 supports ±7V to ±22V. DG201HSDY-E3 offers the widest supply voltage flexibility and superior crosstalk performance (-100dB).
All substitute parts maintain 16-SOIC surface mount packaging, MSL 1 moisture sensitivity, and -40°C to 85°C operating temperature range. Selection should prioritize applications where supply voltage range compatibility and on-state resistance requirements align with design specifications.
Frequently Asked Questions (FAQ)
Q: Can DG201ADY+ be used as a direct replacement for DG201ADY? A: Yes. DG201ADY+ is the active production equivalent with identical electrical specifications (200Ohm on-state resistance, ±4.5V to ±18V dual supply, 4-circuit SPST-NC configuration). The primary difference is product status (active vs. obsolete) and RoHS3 compliance. Both use 16-SOIC surface mount packaging.
Q: What is the key difference between 200Ohm, 90Ohm, 85Ohm, and 50Ohm variants? A: On-state resistance directly affects signal attenuation and power dissipation. Lower resistance values (50Ohm, 85Ohm, 90Ohm) reduce signal loss and heat generation compared to 200Ohm, but may require different supply voltage ranges. Selection depends on application requirements for signal integrity and available supply voltages.
Q: Are all substitute parts compatible with the original DG201ADY supply voltage range of ±4.5V to ±18V? A: No. DG201ADY+ and DG201BDY-E3/DG201BDY-T1-E3 support the full ±4.5V to ±18V range. ADG201AKRZ series operates at ±10V to ±15V (narrower range). ADG201HSKRZ operates at ±14.6V to ±16.5V. DG201HSDY-E3/DG201HSDY-T1-E3 operates at ±7V to ±22V. Verify supply voltage compatibility before selection.
Q: What packaging options are available? A: Tube packaging is standard for low-volume applications. Tape & Reel (TR) and Cut Tape & Digi-Reel packaging are available for higher-volume production. All variants maintain identical 16-SOIC form factor and pin configuration.
Q: Are all substitute parts RoHS3 compliant? A: Yes. All active substitute parts listed are ROHS3 compliant. The original DG201ADY is RoHS non-compliant due to its obsolete status.
Q: Which substitute offers the best overall performance? A: DG201HSDY-E3 and DG201HSDY-T1-E3 provide the lowest on-state resistance (50Ohm), fastest switching (60ns/50ns), lowest leakage current (1nA), and best crosstalk isolation (-100dB @ 100kHz). These parts also support the widest dual supply range (±7V to ±22V), making them suitable for demanding precision switching applications.
Q: Can I mix different substitute parts in the same design? A: All substitute parts maintain identical 16-SOIC pinout and SPST-NC 4-circuit configuration, allowing functional interchangeability. However, differences in on-state resistance, switching speed, and supply voltage requirements may affect circuit performance. Verify electrical specifications against design requirements before mixing variants.
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