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DG409LDY Equivalent & Substitute Parts
Part Overview
The DG409LDY is a 2-circuit SP4T analog switch IC manufactured by Vishay Siliconix in 16-SOIC surface mount packaging. This part operates as a 4:1 multiplexer/demultiplexer with 29Ω on-state resistance and is rated for supply voltages from 2V to 12V (single supply) or ±3V to ±6V (dual supply). The DG409LDY is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Suitable alternatives must maintain the SP4T switching topology, 16-SOIC package format, and compatible electrical performance within the specified operating parameters.
Substiute Parts
Key Parameters
| Parameter | DG409LDY |
|---|---|
| Switch Circuit | SP4T |
| Number of Circuits | 2 |
| Multiplexer/Demultiplexer Circuit | 4:1 |
| On-State Resistance (Max) | 29Ω |
| Channel-to-Channel Matching (ΔRon) | 1Ω |
| Voltage - Supply, Single (V+) | 2V ~ 12V |
| Voltage - Supply, Dual (V±) | ±3V ~ 6V |
| Switch Time (Ton, Toff) (Max) | 55ns, 25ns |
| Charge Injection | 1pC |
| Channel Capacitance (CS(off), CD(off)) | 7pF, 20pF |
| Current - Leakage (IS(off)) (Max) | 1nA |
| Crosstalk | -82dB @ 100kHz |
| Operating Temperature | -40°C ~ 85°C (TA) |
| 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 DG409LDY is determined by the following critical parameters: SP4T switching topology, 2-circuit configuration, 4:1 multiplexer/demultiplexer function, 16-SOIC package format, and surface mount mounting type. On-state resistance, supply voltage range, switching speed, and leakage current are secondary parameters that define performance compatibility. Parts are grouped into three categories based on on-state resistance and supply voltage compatibility:
Group 1 (Low Resistance, Extended Supply Range): DG409LEDY-GE3 offers improved performance with 23Ω on-state resistance, extended single supply range (3V ~ 16V), and active product status with RoHS3 compliance.
Group 2 (Medium Resistance, Higher Supply Voltage): ADG409BRZ, ADG409BRZ-REEL, and ADG409BRZ-REEL7 provide 100Ω on-state resistance with fixed 12V single supply and ±15V dual supply ratings, suitable for applications requiring higher supply voltages.
Group 3 (Higher Resistance, Broadband Performance): ADG1209YRZ and ADG1209YRZ-REEL7 feature 200Ω on-state resistance with 550MHz bandwidth, optimized for RF and broadband signal switching applications.
Group 4 (Higher Resistance, Extended Temperature): ADG1309BRZ-REEL7 provides 210Ω on-state resistance with 500MHz bandwidth and extended operating temperature to 105°C.
Group 5 (Industrial Grade, Wide Supply Range): DG409CY+ and DG409CY+T offer 100Ω on-state resistance with extended supply range (5V ~ 30V single, ±5V ~ 20V dual) and superior crosstalk performance (-92dB @ 100kHz).
Parameter Comparison
| Part Number | Manufacturer | On-State Resistance (Max) | V+ Supply Range | V± Supply Range | Switch Time Ton/Toff (Max) | Charge Injection | Crosstalk @ Frequency | Operating Temp | Product Status | RoHS Status | Package |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DG409LDY | Vishay Siliconix | 29Ω | 2V ~ 12V | ±3V ~ 6V | 55ns, 25ns | 1pC | -82dB @ 100kHz | -40°C ~ 85°C | Obsolete | RoHS non-compliant | 16-SOIC |
| DG409LEDY-GE3 | Vishay Siliconix | 23Ω | 3V ~ 16V | ±3.3V ~ 8V | 72ns, 47ns | -10pC | -109dB @ 100kHz | -40°C ~ 85°C | Active | RoHS3 Compliant | 16-SOIC |
| ADG1209YRZ | Analog Devices Inc. | 200Ω | 5V ~ 16.5V | ±5V ~ 16.5V | 95ns, 100ns | 0.4pC | -85dB @ 1MHz | -40°C ~ 125°C | Active | RoHS3 Compliant | 16-SOIC |
| ADG1209YRZ-REEL7 | Analog Devices Inc. | 200Ω | 5V ~ 16.5V | ±5V ~ 16.5V | 95ns, 100ns | 0.4pC | -85dB @ 1MHz | -40°C ~ 125°C | Active | RoHS3 Compliant | 16-SOIC |
| ADG1309BRZ-REEL7 | Analog Devices Inc. | 210Ω | 5V ~ 16.5V | ±5V ~ 16.5V | 100ns, 100ns | 2pC | -80dB @ 1MHz | -40°C ~ 105°C | Active | RoHS3 Compliant | 16-SOIC |
| ADG409BRZ | Analog Devices Inc. | 100Ω | 12V | ±15V | — | 20pC | -85dB @ 100kHz | -40°C ~ 85°C | Active | RoHS3 Compliant | 16-SOIC |
| ADG409BRZ-REEL | Analog Devices Inc. | 100Ω | 12V | ±15V | — | 20pC | -85dB @ 100kHz | -40°C ~ 85°C | Active | RoHS3 Compliant | 16-SOIC |
| ADG409BRZ-REEL7 | Analog Devices Inc. | 100Ω | 12V | ±15V | — | 20pC | -85dB @ 100kHz | -40°C ~ 85°C | Active | RoHS3 Compliant | 16-SOIC |
| DG409CY+ | Analog Devices Inc./Maxim Integrated | 100Ω | 5V ~ 30V | ±5V ~ 20V | 150ns, 150ns | 2pC | -92dB @ 100kHz | 0°C ~ 70°C | Active | RoHS3 Compliant | 16-SOIC |
| DG409CY+T | Analog Devices Inc./Maxim Integrated | 100Ω | 5V ~ 30V | ±5V ~ 20V | 150ns, 150ns | 2pC | -92dB @ 100kHz | 0°C ~ 70°C | Active | RoHS3 Compliant | 16-SOIC |
| DG409DY+ | Analog Devices Inc./Maxim Integrated | 100Ω | 5V ~ 30V | ±5V ~ 20V | 150ns, 150ns | 2pC | -92dB @ 100kHz | -40°C ~ 85°C | Active | RoHS3 Compliant | 16-SOIC |
Engineering Selection Recommendations
Primary Recommendation: DG409LEDY-GE3
The DG409LEDY-GE3 is the closest functional equivalent to the DG409LDY. Both parts are manufactured by Vishay Siliconix and maintain the same SP4T topology, 2-circuit configuration, and 16-SOIC package. The DG409LEDY-GE3 offers superior performance with lower on-state resistance (23Ω vs. 29Ω), extended supply voltage range (3V ~ 16V), and active product status with RoHS3 compliance. This part is suitable for direct replacement in new designs and production continuity.
Secondary Recommendation: DG409DY+
The DG409DY+ provides an alternative from the Analog Devices/Maxim Integrated product line with 100Ω on-state resistance, extended supply range (5V ~ 30V single, ±5V ~ 20V dual), and active product status with RoHS3 compliance. This part is appropriate for applications where higher supply voltages are required and on-state resistance is not a critical constraint. Operating temperature range extends to -40°C ~ 85°C, matching the original part.
Tertiary Recommendation: ADG1209YRZ or ADG1209YRZ-REEL7
These Analog Devices parts offer 200Ω on-state resistance with 550MHz bandwidth, optimized for RF and broadband signal switching. They are suitable for applications requiring higher frequency performance and extended operating temperature to 125°C. Both parts maintain active product status and RoHS3 compliance.
Compliance Consideration:
All recommended substitute parts carry RoHS3 compliance, addressing regulatory requirements absent in the obsolete DG409LDY. Selection should prioritize parts with active product status to ensure long-term availability and manufacturing support.
Frequently Asked Questions (FAQ)
Q: Can the DG409LEDY-GE3 directly replace the DG409LDY in existing designs?
A: Yes. Both parts share identical SP4T topology, 2-circuit configuration, 4:1 multiplexer/demultiplexer function, and 16-SOIC package format. The DG409LEDY-GE3 offers improved performance with lower on-state resistance and extended supply voltage range. Pin-to-pin compatibility is maintained.
Q: What is the primary difference between DG409LEDY-GE3 and ADG409BRZ?
A: The DG409LEDY-GE3 features 23Ω on-state resistance with supply range 3V ~ 16V (single) or ±3.3V ~ 8V (dual). The ADG409BRZ provides 100Ω on-state resistance with fixed 12V (single) or ±15V (dual) supply. Selection depends on application requirements for on-state resistance and supply voltage flexibility.
Q: Are all substitute parts available in the same packaging options?
A: All substitute parts are available in 16-SOIC surface mount packaging. Packaging variants differ by tape-and-reel configuration (standard tube, cut tape with Digi-Reel, or tape and reel). Consult specific part numbers for packaging availability.
Q: Which substitute part offers the best high-frequency performance?
A: The ADG1209YRZ and ADG1209YRZ-REEL7 provide 550MHz bandwidth, optimized for RF and broadband applications. These parts are suitable for signal switching at higher frequencies compared to the original DG409LDY.
Q: What is the operating temperature range difference between substitute options?
A: The DG409LEDY-GE3, ADG409BRZ variants, and DG409DY+ operate from -40°C to 85°C. The ADG1209 series extends to 125°C. The DG409CY+ and DG409CY+T operate from 0°C to 70°C, which is narrower than the original part.
Q: Are all substitute parts RoHS compliant?
A: Yes. All recommended substitute parts carry RoHS3 compliance. The original DG409LDY is RoHS non-compliant, making RoHS3-compliant substitutes necessary for applications subject to RoHS regulations.
Q: How does on-state resistance affect circuit performance?
A: On-state resistance determines signal attenuation and power dissipation in the switch path. Lower resistance (23Ω in DG409LEDY-GE3) reduces signal loss and heat generation. Higher resistance (100Ω ~ 210Ω in ADG variants) may be acceptable in applications where signal integrity is less critical or where higher supply voltages are required.
Q: Can I use ADG409BRZ in place of DG409LDY if my circuit operates at 12V?
A: Yes, if your circuit operates at fixed 12V single supply or ±15V dual supply. The ADG409BRZ maintains SP4T topology and 16-SOIC packaging. However, the 100Ω on-state resistance is higher than the original 29Ω, which may affect signal attenuation depending on application requirements.
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