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DG409LDY-T1 Equivalent & Substitute Parts
Part Overview
The DG409LDY-T1 is a dual-circuit SP4T analog switch manufactured by Vishay Siliconix, configured as a 4:1 multiplexer/demultiplexer in a 16-SOIC surface-mount package. This component features 29Ohm on-state resistance and operates across single supply (2V to 12V) or dual supply (±3V to ±6V) configurations. The part is classified as obsolete, necessitating identification of functionally equivalent active alternatives that maintain compatibility with existing circuit designs while meeting current component availability and compliance requirements.
Substiute Parts
Key Parameters
| Parameter | DG409LDY-T1 Specification |
|---|---|
| Switch Circuit Configuration | SP4T (Single Pole, 4-Throw) |
| Number of Circuits | 2 |
| Multiplexer/Demultiplexer Circuit | 4:1 |
| On-State Resistance (Max) | 29Ohm |
| Channel-to-Channel Matching (ΔRon) | 1Ohm |
| 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 |
| RoHS Status | RoHS non-compliant |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the DG409LDY-T1 is determined by the following mandatory compatibility criteria:
Functional Requirements:
- Switch circuit configuration: SP4T
- Number of circuits: 2
- Multiplexer/demultiplexer circuit: 4:1
- Package type: 16-SOIC surface mount
Electrical Compatibility Criteria:
- On-state resistance must not exceed application requirements (DG409LDY-T1 baseline: 29Ohm)
- Supply voltage range must encompass or exceed the original specification
- Operating temperature range must cover or exceed -40°C to 85°C minimum
- Leakage current and crosstalk performance must meet or exceed original specifications
Substitute parts are grouped into three categories based on on-state resistance performance:
Category A - Low Resistance (29-100Ohm): DG409CY+, DG409CY+T, DG409DY+, DG409DY+T, ADG409BRZ, ADG409BRZ-REEL, ADG409BRZ-REEL7. These parts maintain resistance characteristics closest to the original specification.
Category B - Medium Resistance (200Ohm): ADG1209YRZ, ADG1209YRZ-REEL7. These parts provide higher on-state resistance with enhanced supply voltage range and improved bandwidth performance.
Category C - Medium-High Resistance (210Ohm): ADG1309BRZ-REEL7. This part offers similar resistance to Category B with alternative performance characteristics.
Parameter Comparison
| Parameter | DG409LDY-T1 | DG409CY+ | DG409DY+ | ADG409BRZ | ADG1209YRZ | ADG1309BRZ-REEL7 |
|---|---|---|---|---|---|---|
| Switch Circuit | SP4T | SP4T | SP4T | SP4T | SP4T | SP4T |
| Number of Circuits | 2 | 2 | 2 | 2 | 2 | 2 |
| Multiplexer Circuit | 4:1 | 4:1 | 4:1 | 4:1 | 4:1 | 4:1 |
| On-State Resistance (Max) | 29Ohm | 100Ohm | 100Ohm | 100Ohm | 200Ohm | 210Ohm |
| Channel-to-Channel Matching (ΔRon) | 1Ohm | 1.5Ohm | 1.5Ohm | 15Ohm (Max) | 4.6Ohm | 5Ohm |
| Voltage - Supply, Single (V+) | 2V ~ 12V | 5V ~ 30V | 5V ~ 30V | 12V | 5V ~ 16.5V | 5V ~ 16.5V |
| Voltage - Supply, Dual (V±) | ±3V ~ 6V | ±5V ~ 20V | ±5V ~ 20V | ±15V | ±5V ~ 16.5V | ±5V ~ 16.5V |
| Switch Time Ton (Max) | 55ns | 150ns | 150ns | — | 95ns | 100ns |
| Switch Time Toff (Max) | 25ns | 150ns | 150ns | — | 100ns | 100ns |
| Charge Injection | 1pC | 2pC | 2pC | 20pC | 0.4pC | 2pC |
| Channel Capacitance CS(off) | 7pF | 3pF | 3pF | 11pF | 1.5pF | 10pF |
| Channel Capacitance CD(off) | 20pF | 14pF | 14pF | 20pF | 4.5pF | 15pF |
| Current - Leakage (IS(off)) (Max) | 1nA | 500pA | 500pA | 500pA | 100pA | 1nA |
| Crosstalk | -82dB @ 100kHz | -92dB @ 100kHz | -92dB @ 100kHz | -85dB @ 100kHz | -85dB @ 1MHz | -80dB @ 1MHz |
| Operating Temperature | -40°C ~ 85°C | 0°C ~ 70°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 125°C | -40°C ~ 105°C |
| Package / Case | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC |
| RoHS Status | Non-compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Obsolete | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
Primary Substitutes (Closest Electrical Match):
DG409DY+ and DG409DY+T are the preferred direct replacements. Both maintain 100Ohm on-state resistance, support the full -40°C to 85°C operating temperature range of the original part, and achieve ROHS3 compliance. These parts are manufactured by Analog Devices Inc./Maxim Integrated and are in active production status with substantial inventory availability (1432 and 1878 units respectively).
Alternative Substitutes (Extended Supply Range):
DG409CY+ and DG409CY+T offer expanded supply voltage capability (5V to 30V single supply, ±5V to ±20V dual supply) compared to the original specification. However, the operating temperature range is limited to 0°C to 70°C, which does not cover the full -40°C lower bound of the original part. These are suitable only for applications where the reduced temperature range is acceptable.
High-Performance Alternatives (Lower Resistance):
ADG409BRZ, ADG409BRZ-REEL, and ADG409BRZ-REEL7 maintain 100Ohm on-state resistance and full -40°C to 85°C temperature coverage. These Analog Devices parts are ROHS3 compliant and active. The ADG409BRZ-REEL7 variant offers the highest inventory (10,300 units) and is packaged in Cut Tape & Digi-Reel format.
Higher Resistance Alternatives (Extended Bandwidth):
ADG1209YRZ and ADG1209YRZ-REEL7 provide 200Ohm on-state resistance with extended operating temperature to 125°C and 550MHz bandwidth. These are suitable for applications where higher resistance is acceptable and extended temperature range is beneficial. The REEL7 variant provides significantly higher inventory (42,165 units).
ADG1309BRZ-REEL7 offers 210Ohm on-state resistance with 500MHz bandwidth and -40°C to 105°C temperature range. This part is suitable for applications requiring moderate resistance with extended temperature coverage.
Compliance Consideration:
All recommended active substitutes are ROHS3 compliant, addressing the non-compliance status of the obsolete DG409LDY-T1. Selection should prioritize parts matching the original on-state resistance (100Ohm category) unless circuit design permits higher resistance operation.
Frequently Asked Questions (FAQ)
Q: Can DG409DY+ directly replace DG409LDY-T1 without circuit modification?
A: Yes. DG409DY+ maintains identical switch circuit configuration (SP4T, 2 circuits, 4:1 multiplexer), 100Ohm on-state resistance, and -40°C to 85°C operating temperature range. The 16-SOIC package footprint is identical. No circuit modification is required for pin-compatible substitution.
Q: What is the difference between DG409DY+ and ADG409BRZ?
A: Both parts feature 100Ohm on-state resistance and identical package type. DG409DY+ is manufactured by Analog Devices Inc./Maxim Integrated with 1432 units in stock. ADG409BRZ is manufactured by Analog Devices Inc. with 17,856 units in stock. The primary difference is manufacturer designation and inventory availability. Electrical specifications are equivalent for most applications.
Q: Why do ADG1209YRZ and ADG1309BRZ-REEL7 have higher on-state resistance?
A: These parts are designed for different application requirements. The 200Ohm and 210Ohm resistance values represent alternative design points within the SP4T 4:1 multiplexer category. Higher resistance typically correlates with lower power consumption and different bandwidth characteristics. Selection depends on whether the application circuit can tolerate increased on-state resistance.
Q: Are all substitute parts available in the same packaging format?
A: All substitute parts are available in 16-SOIC surface-mount package with identical 0.154" (3.90mm) width. Packaging variants differ in delivery format: Tube, Cut Tape & Digi-Reel (CT), or Tape & Reel (TR). The physical component and PCB footprint remain identical across all variants.
Q: What is the significance of the ROHS3 compliance status?
A: ROHS3 compliance indicates the part meets current Restriction of Hazardous Substances regulations. The original DG409LDY-T1 is RoHS non-compliant, reflecting its obsolete status. All active substitute parts are ROHS3 compliant, ensuring compatibility with current manufacturing standards and regulatory requirements.
Q: Can DG409CY+ be used if the application only operates at 25°C?
A: Yes, if the application operates exclusively within the 0°C to 70°C range supported by DG409CY+. However, this part does not cover the full -40°C lower operating temperature of the original specification. Use is restricted to applications with confirmed temperature requirements within the 0°C to 70°C window.
Q: Which substitute offers the best leakage current performance?
A: ADG1209YRZ and ADG1209YRZ-REEL7 provide the lowest leakage current at 100pA maximum, compared to 500pA for most other alternatives and 1nA for the original part. This makes the ADG1209 series suitable for low-power or high-impedance applications where leakage minimization is critical.
Q: What is the difference between ADG409BRZ-REEL and ADG409BRZ-REEL7?
A: Both parts are identical in electrical specification and 16-SOIC package. The difference is in delivery format: ADG409BRZ-REEL is standard Cut Tape & Digi-Reel format with 1456 units in stock. ADG409BRZ-REEL7 is also Cut Tape & Digi-Reel format with 10,300 units in stock. The REEL7 designation indicates higher inventory availability and may offer better lead time.
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