DG418CY Equivalent & Substitute Parts

Part Overview

The DG418CY is a single-circuit SPST-NO (Normally Open) analog switch IC manufactured by Analog Devices Inc./Maxim Integrated, housed in an 8-SOIC surface mount package. This component is classified as obsolete, with 1309 units currently in stock. The DG418CY operates as a 1:1 multiplexer/demultiplexer with a maximum on-state resistance of 35Ohm and supports both single supply (10V–30V) and dual supply (±4.5V–20V) configurations. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs and long-term availability assurance.

Key Parameters

Parameter	DG418CY Value
Switch Circuit	SPST - NO
Multiplexer/Demultiplexer Circuit	1:1
Number of Circuits	1
On-State Resistance (Max)	35Ohm
Channel-to-Channel Matching (ΔRon)	3Ohm (Max)
Voltage - Supply, Single (V+)	10V ~ 30V
Voltage - Supply, Dual (V±)	±4.5V ~ 20V
Switch Time (Ton, Toff) (Max)	175ns, 145ns
Charge Injection	3pC
Channel Capacitance (CS(off), CD(off))	8pF, 8pF
Current - Leakage (IS(off)) (Max)	250pA
Crosstalk	-85dB @ 1MHz
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the DG418CY is determined by the following critical parameters:

Switch Circuit Type: SPST - NO configuration must be maintained
Circuit Count & Multiplexer Ratio: 1:1 multiplexer/demultiplexer topology
On-State Resistance: Maximum 35Ohm (primary electrical characteristic)
Package Type: 8-SOIC surface mount form factor
Supply Voltage Compatibility: Single supply (10V–30V) or dual supply (±4.5V–20V) operation
Leakage Current: Maximum 250pA specification
Product Status: Active product lines preferred for long-term availability

Substitute parts are grouped into two categories based on on-state resistance specifications:

Category A - 35Ohm On-State Resistance (Direct Electrical Match)

DG418CY+ (Analog Devices Inc./Maxim Integrated, Active, Tube packaging)
DG418DY-E3 (Vishay Siliconix, Active, Tube packaging)
DG418DY-T1-E3 (Vishay Siliconix, Active, Tape & Reel packaging)

Category B - 25Ohm On-State Resistance (Lower Resistance Alternative)

DG418BDY-E3 (Vishay Siliconix, Active, Tube packaging)
DG418BDY-T1-E3 (Vishay Siliconix, Active, Tape & Reel packaging)

Parameter Comparison

Parameter	DG418CY	DG418CY+	DG418DY-E3	DG418DY-T1-E3	DG418BDY-E3	DG418BDY-T1-E3
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Vishay Siliconix	Vishay Siliconix	Vishay Siliconix	Vishay Siliconix
Product Status	Obsolete	Active	Active	Active	Active	Active
Switch Circuit	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO
On-State Resistance (Max)	35Ohm	35Ohm	35Ohm	35Ohm	25Ohm	25Ohm
Voltage - Supply, Single (V+)	10V ~ 30V	10V ~ 30V	12V	12V	13V ~ 36V	13V ~ 36V
Voltage - Supply, Dual (V±)	±4.5V ~ 20V	±4.5V ~ 20V	±15V	±15V	±7V ~ 22V	±7V ~ 22V
Switch Time (Ton, Toff) (Max)	175ns, 145ns	175ns, 145ns	175ns, 145ns	175ns, 145ns	89ns, 80ns	89ns, 80ns
Charge Injection	3pC	3pC	60pC	60pC	38pC	38pC
Channel Capacitance (CS(off), CD(off))	8pF, 8pF	8pF, 8pF	8pF, 8pF	8pF, 8pF	12pF, 12pF	12pF, 12pF
Current - Leakage (IS(off)) (Max)	250pA	250pA	250pA	250pA	250pA	250pA
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°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)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	Bulk	Tube	Tube	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Inventory (Pcs)	1309	4300	1295	25100	984	1429

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

Select DG418CY+ as the primary substitute. This part maintains identical on-state resistance (35Ohm), charge injection (3pC), and channel capacitance (8pF) specifications. It is manufactured by the same original supplier (Analog Devices Inc./Maxim Integrated), carries Active product status, and achieves ROHS3 compliance. Tube packaging is suitable for standard component handling.

For Extended Temperature Range Applications:

DG418DY-E3 or DG418DY-T1-E3 (Vishay Siliconix) provide identical on-state resistance and switching time characteristics while extending the operating temperature range to -40°C ~ 85°C. These parts are ROHS3 compliant and maintain 250pA maximum leakage current. DG418DY-T1-E3 offers higher inventory availability (25100 units) in Tape & Reel packaging, suitable for automated assembly processes.

For Lower On-State Resistance Applications:

DG418BDY-E3 or DG418BDY-T1-E3 (Vishay Siliconix) reduce on-state resistance to 25Ohm maximum, resulting in faster switching times (89ns/80ns versus 175ns/145ns). These parts support extended supply voltage ranges (13V–36V single supply, ±7V–22V dual supply) and operate across -40°C ~ 85°C. Use this category only when lower resistance and faster switching are design requirements, as charge injection increases to 38pC and channel capacitance increases to 12pF.

Compliance Considerations:

All substitute parts achieve ROHS3 compliance, addressing the RoHS non-compliance status of the obsolete DG418CY. All parts maintain MSL 1 (Unlimited) moisture sensitivity rating and are REACH Unaffected.

Frequently Asked Questions (FAQ)

Q: Can DG418CY+ be used as a direct drop-in replacement for DG418CY?

A: Yes. DG418CY+ maintains identical electrical specifications: 35Ohm on-state resistance, 3pC charge injection, 8pF channel capacitance, 175ns/145ns switching times, and 250pA leakage current. The primary difference is product status (Active versus Obsolete) and RoHS compliance (ROHS3 versus non-compliant). Pinout and 8-SOIC package dimensions are identical.

Q: What are the key differences between the 35Ohm and 25Ohm resistance categories?

A: The 35Ohm category (DG418CY+, DG418DY-E3, DG418DY-T1-E3) provides direct electrical equivalence to the original DG418CY. The 25Ohm category (DG418BDY-E3, DG418BDY-T1-E3) offers lower on-state resistance, resulting in faster switching times (89ns/80ns) and reduced power dissipation. However, 25Ohm parts exhibit higher charge injection (38pC) and larger channel capacitance (12pF). Select 25Ohm parts only when lower resistance and faster switching are required by the application.

Q: Are there supply voltage compatibility issues between substitutes?

A: Yes. The original DG418CY supports 10V–30V single supply and ±4.5V–20V dual supply. DG418CY+ maintains these ranges. Vishay Siliconix parts (DG418DY-E3, DG418DY-T1-E3) operate at fixed 12V single supply and ±15V dual supply. DG418BDY-E3 and DG418BDY-T1-E3 support 13V–36V single supply and ±7V–22V dual supply. Verify your circuit's supply voltage requirements before selecting a substitute.

Q: What is the difference between Tube and Tape & Reel packaging?

A: Tube packaging (DG418CY+, DG418DY-E3, DG418BDY-E3) is suitable for manual component handling and lower-volume assembly. Tape & Reel packaging (DG418DY-T1-E3, DG418BDY-T1-E3) is designed for automated pick-and-place assembly equipment and high-volume production. Both packaging types contain identical components; the choice depends on assembly process requirements.

Q: Why do Vishay Siliconix parts show different charge injection and capacitance values?

A: Charge injection and channel capacitance are process-dependent parameters that vary between manufacturers. DG418CY and DG418CY+ (Analog Devices/Maxim) specify 3pC charge injection and 8pF capacitance. Vishay Siliconix 35Ohm parts (DG418DY series) specify 60pC charge injection, and 25Ohm parts (DG418BDY series) specify 38pC charge injection with 12pF capacitance. These differences reflect different silicon process technologies. Verify these parameters against your circuit's signal integrity and bandwidth requirements.

Q: Is RoHS compliance mandatory for my application?

A: RoHS compliance is determined by your end-market regulations and customer requirements. The original DG418CY is RoHS non-compliant. All substitute parts (DG418CY+, DG418DY-E3, DG418DY-T1-E3, DG418BDY-E3, DG418BDY-T1-E3) are ROHS3 compliant. If your application or region requires RoHS compliance, any of the substitute parts satisfy this requirement.

Q: Which substitute offers the best long-term availability?

A: DG418DY-T1-E3 (Vishay Siliconix, Tape & Reel) currently shows the highest inventory (25100 units) and Active product status, indicating strong long-term availability. DG418CY+ (Analog Devices/Maxim, 4300 units) is the second choice for direct electrical equivalence with high inventory. Both parts are suitable for long-term design commitments.

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