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DG417LDY IC Switch SPST-NC Equivalent & Substitute Parts
Part Overview
The DG417LDY is a single-circuit SPST-NC (Normally Closed) analog switch manufactured by Analog Devices Inc./Maxim Integrated. This interface component operates as a 1:1 multiplexer/demultiplexer with 35Ohm on-state resistance in an 8-SOIC surface mount package. The DG417LDY is classified as obsolete, making identification of active equivalent parts essential for new designs and production continuity. Substitute parts must maintain identical electrical performance and mechanical compatibility while offering current product status and compliance certifications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Switch Circuit Type | SPST - NC |
| Multiplexer/Demultiplexer Configuration | 1:1 |
| Number of Circuits | 1 |
| On-State Resistance (Max) | 35Ohm |
| Channel-to-Channel Matching (ΔRon) | 100mOhm |
| Voltage - Supply, Single (V+) | 9V ~ 36V |
| Voltage - Supply, Dual (V±) | ±4.5V ~ 20V |
| Switch Time (Ton, Toff) (Max) | 175ns, 185ns |
| Charge Injection | 15pC |
| Channel Capacitance (CS(off), CD(off)) | 8pF, 8pF |
| Current - Leakage (IS(off)) (Max) | 250pA |
| Operating Temperature Range | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Supplier Device Package | 8-SOIC |
Substitute Part Grouping Explanation
Substitution of the DG417LDY is determined by strict equivalence across all electrical and mechanical parameters. The primary substitute identified is the DG417LDY+, which maintains identical specifications for switch circuit topology, on-state resistance, supply voltage ranges, switching characteristics, and package configuration. Both parts are based on the DG417 base product number and share the same 8-SOIC form factor.
The substitution is valid because the DG417LDY+ preserves all critical parameters:
- Identical SPST-NC switch circuit configuration
- Matching 1:1 multiplexer/demultiplexer topology
- Equivalent 35Ohm on-state resistance and 100mOhm channel matching
- Same supply voltage specifications (9V ~ 36V single, ±4.5V ~ 20V dual)
- Identical switching times (175ns Ton, 185ns Toff)
- Matching charge injection (15pC) and capacitance values
- Same leakage current specification (250pA max)
- Identical operating temperature range (-40°C ~ 85°C)
- Equivalent 8-SOIC package dimensions
The only differences between the main part and substitute are product status (obsolete vs. active) and packaging format (unspecified vs. tube), along with compliance certifications.
Parameter Comparison
| Parameter | DG417LDY (Main) | DG417LDY+ (Substitute) |
|---|---|---|
| Manufacturer | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated |
| Switch Circuit | SPST - NC | SPST - NC |
| Multiplexer/Demultiplexer Circuit | 1:1 | 1:1 |
| Number of Circuits | 1 | 1 |
| On-State Resistance (Max) | 35Ohm | 35Ohm |
| Channel-to-Channel Matching (ΔRon) | 100mOhm | 100mOhm |
| Voltage - Supply, Single (V+) | 9V ~ 36V | 9V ~ 36V |
| Voltage - Supply, Dual (V±) | ±4.5V ~ 20V | ±4.5V ~ 20V |
| Switch Time Ton (Max) | 175ns | 175ns |
| Switch Time Toff (Max) | 185ns | 185ns |
| Charge Injection | 15pC | 15pC |
| Channel Capacitance CS(off) | 8pF | 8pF |
| Channel Capacitance CD(off) | 8pF | 8pF |
| Current - Leakage IS(off) (Max) | 250pA | 250pA |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) |
| Supplier Device Package | 8-SOIC | 8-SOIC |
| Product Status | Obsolete | Active |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) |
| REACH Status | REACH Unaffected | REACH Unaffected |
| ECCN | EAR99 | EAR99 |
| HTSUS | 8542.39.0001 | 8542.39.0001 |
Engineering Selection Recommendations
The DG417LDY+ is the direct equivalent substitute for the obsolete DG417LDY. Both parts are electrically and mechanically identical across all specified parameters, ensuring pin-for-pin and functional compatibility in existing circuit designs.
Selection between the main part and substitute should be based on product availability and compliance requirements:
DG417LDY (Obsolete): Suitable only for legacy system maintenance or repair applications where existing inventory is available. RoHS non-compliant status restricts use in new designs subject to RoHS3 regulations.
DG417LDY+ (Active): Recommended for all new designs and production applications. Active product status ensures ongoing availability and supply chain continuity. ROHS3 compliance satisfies environmental and regulatory requirements for modern manufacturing and distribution channels.
Both parts maintain identical electrical performance, switching characteristics, and thermal specifications across the -40°C to 85°C operating range. The 8-SOIC surface mount package is consistent between both variants, requiring no PCB layout modifications for substitution.
Frequently Asked Questions (FAQ)
Q: Can the DG417LDY+ directly replace the DG417LDY in existing designs?
A: Yes. The DG417LDY+ is electrically and mechanically equivalent to the DG417LDY. All electrical parameters, switching characteristics, supply voltage ranges, and package dimensions are identical. No circuit modifications or PCB redesign is required.
Q: What is the difference between DG417LDY and DG417LDY+?
A: The primary differences are product status and compliance certifications. The DG417LDY is obsolete with RoHS non-compliant status. The DG417LDY+ is an active product with ROHS3 compliance. Electrical and mechanical specifications are identical.
Q: Are there any package or pinout differences?
A: No. Both parts use the 8-SOIC package with identical dimensions (0.154" width, 3.90mm). Pinout and PCB footprint are identical, enabling direct substitution without layout changes.
Q: What supply voltages are supported?
A: Both parts support single supply operation from 9V to 36V (V+) or dual supply operation from ±4.5V to ±20V (V±).
Q: What is the on-state resistance specification?
A: Both parts specify a maximum on-state resistance of 35Ohm with channel-to-channel matching of 100mOhm.
Q: What are the switching time specifications?
A: Both parts specify maximum switch-on time (Ton) of 175ns and maximum switch-off time (Toff) of 185ns.
Q: Is the DG417LDY+ suitable for RoHS3 compliant applications?
A: Yes. The DG417LDY+ carries ROHS3 compliance certification, making it suitable for applications and supply chains requiring RoHS3 compliance. The obsolete DG417LDY does not carry this certification.
Q: What is the moisture sensitivity level?
A: Both parts are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.
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