DG418LDY-T1 Equivalent & Substitute Parts

Part Overview

The DG418LDY-T1 is a single-circuit SPST-NO (Normally Open) analog switch IC manufactured by Vishay Siliconix in 8-SOIC surface mount packaging. This component features a 20Ohm on-state resistance and operates across supply voltages of 2.7V to 12V (single supply) or ±3V to ±6V (dual supply). The DG418LDY-T1 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute components must maintain functional compatibility while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	DG418LDY-T1
Switch Circuit	SPST - NO
Multiplexer/Demultiplexer Circuit	1:1
Number of Circuits	1
On-State Resistance (Max)	20Ohm
Voltage - Supply, Single (V+)	2.7V ~ 12V
Voltage - Supply, Dual (V±)	±3V ~ 6V
Switch Time (Ton, Toff) (Max)	43ns, 31ns
Charge Injection	1pC
Channel Capacitance (CS(off), CD(off))	5pF
Current - Leakage (IS(off)) (Max)	1nA
Crosstalk	-71dB @ 1MHz
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-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 DG418LDY-T1 is determined by the following critical parameters:

Switch topology: SPST-NO configuration with 1:1 multiplexer/demultiplexer circuit
Package compatibility: 8-SOIC surface mount form factor (0.154", 3.90mm Width)
On-state resistance: Maximum 20Ohm specification
Supply voltage range: Single supply 2.7V ~ 12V or dual supply ±3V ~ ±6V
Operating temperature: -40°C ~ 85°C range
Functional parameters: Switch time, charge injection, and leakage current within acceptable limits

The substitute parts DG418CY+, DG418DY+, and DG418LDY+ share the same base product number (DG418), identical package type, and equivalent switch topology. All substitutes maintain the 8-SOIC form factor and SPST-NO circuit configuration. However, on-state resistance specifications differ across the product line, requiring verification against application requirements.

Parameter Comparison

Parameter	DG418LDY-T1	DG418CY+	DG418DY+	DG418LDY+
Manufacturer	Vishay Siliconix	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Switch Circuit	SPST - NO	SPST - NO	SPST - NO	SPST - NO
Multiplexer/Demultiplexer Circuit	1:1	1:1	1:1	1:1
Number of Circuits	1	1	1	1
On-State Resistance (Max)	20Ohm	35Ohm	35Ohm	35Ohm
Voltage - Supply, Single (V+)	2.7V ~ 12V	10V ~ 30V	10V ~ 30V	9V ~ 36V
Voltage - Supply, Dual (V±)	±3V ~ 6V	±4.5V ~ 20V	±4.5V ~ 20V	±4.5V ~ 20V
Switch Time (Ton, Toff) (Max)	43ns, 31ns	175ns, 145ns	175ns, 145ns	175ns, 185ns
Charge Injection	1pC	3pC	3pC	15pC
Channel Capacitance (CS(off), CD(off))	5pF	8pF, 8pF	8pF, 8pF	8pF, 8pF
Current - Leakage (IS(off)) (Max)	1nA	250pA	250pA	250pA
Operating Temperature	-40°C ~ 85°C (TA)	0°C ~ 70°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

DG418DY+ is the primary substitute for the DG418LDY-T1 when operating temperature range of -40°C to 85°C is required. This part maintains full temperature coverage of the original component while offering active product status and ROHS3 compliance. The DG418DY+ is manufactured by Analog Devices Inc./Maxim Integrated and provides equivalent functional performance within the specified operating envelope.

DG418LDY+ serves as an alternative substitute with extended single-supply voltage range (9V ~ 36V) compared to the original specification (2.7V ~ 12V). This part is suitable for applications requiring higher supply voltage flexibility while maintaining the -40°C to 85°C operating temperature range. The DG418LDY+ carries active product status and ROHS3 compliance.

DG418CY+ is applicable only for applications with operating temperature requirements limited to 0°C ~ 70°C. This part offers the narrowest temperature range among the substitutes and should be selected only when the application environment does not require extended low-temperature operation below 0°C.

All substitute parts share identical 8-SOIC packaging and SPST-NO switch topology. The primary trade-off across the product line is on-state resistance (20Ohm original versus 35Ohm substitutes), which must be evaluated against circuit design requirements. All substitutes feature higher leakage current (250pA versus 1nA) and increased charge injection compared to the original part.

Frequently Asked Questions (FAQ)

Q: Can DG418CY+, DG418DY+, or DG418LDY+ be used as direct replacements for DG418LDY-T1?

A: These parts share the same 8-SOIC package and SPST-NO switch topology, enabling PCB-level compatibility. However, on-state resistance differs (35Ohm versus 20Ohm), requiring circuit analysis to confirm functional equivalence. Operating temperature ranges vary; DG418CY+ is limited to 0°C ~ 70°C, while DG418DY+ and DG418LDY+ support -40°C ~ 85°C.

Q: What is the primary difference between DG418DY+ and DG418LDY+?

A: Both parts support -40°C ~ 85°C operating temperature and feature 35Ohm on-state resistance. DG418LDY+ offers extended single-supply voltage range (9V ~ 36V) compared to DG418DY+ (10V ~ 30V). DG418LDY+ also exhibits higher charge injection (15pC versus 3pC), which may affect signal integrity in precision analog applications.

Q: Are all substitute parts RoHS compliant?

A: Yes. DG418CY+, DG418DY+, and DG418LDY+ are all ROHS3 compliant, whereas the original DG418LDY-T1 is RoHS non-compliant. This compliance improvement is a benefit for new designs and manufacturing environments with RoHS requirements.

Q: How does the 35Ohm on-state resistance of substitutes compare to the 20Ohm specification of the original part?

A: The 75% increase in on-state resistance (from 20Ohm to 35Ohm) affects signal attenuation and power dissipation. Applications sensitive to on-state resistance must evaluate circuit performance with the higher value. Low-impedance signal paths and high-current switching applications may require circuit redesign.

Q: Which substitute part should be selected for applications requiring the widest supply voltage range?

A: DG418LDY+ provides the widest single-supply voltage range (9V ~ 36V) among the substitutes. This part is suitable for applications with variable or extended supply voltage requirements while maintaining -40°C ~ 85°C operating temperature coverage.

Q: Are the 8-SOIC packages of all parts physically identical?

A: Yes. All parts (DG418LDY-T1, DG418CY+, DG418DY+, and DG418LDY+) use 8-SOIC packaging with 0.154" (3.90mm) width, enabling direct PCB footprint compatibility without layout modifications.

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