DG401CY Equivalent & Substitute Parts

Part Overview

The DG401CY is a 2-circuit SPST-NO (Single Pole Single Throw - Normally Open) analog switch IC manufactured by Analog Devices Inc./Maxim Integrated, housed in a 16-SOIC surface mount package. This component functions as a precision electronic switch with 45Ohm on-state resistance, designed for signal routing and multiplexing applications in analog circuits.

The DG401CY is classified as obsolete. Locating equivalent or substitute parts is necessary to support ongoing production, maintenance, and new design implementations where this component is specified or required for system compatibility.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NO
Number of Circuits	2
Multiplexer/Demultiplexer Configuration	1:1
On-State Resistance (Max)	45Ohm
Channel-to-Channel Matching (ΔRon)	500mOhm
Voltage - Supply, Single (V+)	10V ~ 30V
Voltage - Supply, Dual (V±)	±4.5V ~ 20V
Switch Time (Ton, Toff) (Max)	150ns, 100ns
Charge Injection	10pC
Channel Capacitance (CS(off), CD(off))	12pF, 12pF
Current - Leakage (IS(off)) (Max)	500pA
Crosstalk	-90dB @ 1MHz
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the DG401CY is determined by the following critical parameters:

Switch Circuit Type & Configuration: Must be SPST - NO with 1:1 multiplexer/demultiplexer configuration and 2 circuits
On-State Resistance: Must be 45Ohm maximum
Package & Mounting: Must be 16-SOIC surface mount package
Switch Timing: Must support 150ns (Ton) and 100ns (Toff) maximum specifications
Leakage Current: Must not exceed 500pA at maximum
Channel Capacitance: Must be 12pF for both CS(off) and CD(off)

The following parts meet these core electrical and mechanical requirements and are classified as direct substitutes:

DG401CY+ (Analog Devices Inc./Maxim Integrated) - Active product status, RoHS3 compliant
DG401DY-E3 (Vishay Siliconix) - Active product status, RoHS3 compliant, extended operating temperature range
DG401DY-T1-E3 (Vishay Siliconix) - Active product status, RoHS3 compliant, tape & reel packaging
DG401DYZ (Renesas Electronics Corporation) - Obsolete product status, RoHS3 compliant
DG401DYZ-T (Renesas Electronics Corporation) - Obsolete product status, RoHS3 compliant, cut tape packaging

Parameter Comparison

Parameter	DG401CY	DG401CY+	DG401DY-E3	DG401DY-T1-E3	DG401DYZ	DG401DYZ-T
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Vishay Siliconix	Vishay Siliconix	Renesas Electronics Corporation	Renesas Electronics Corporation
Product Status	Obsolete	Active	Active	Active	Obsolete	Obsolete
Switch Circuit	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO
Number of Circuits	2	2	2	2	2	2
On-State Resistance (Max)	45Ohm	45Ohm	45Ohm	45Ohm	45Ohm	45Ohm
Voltage - Supply, Single (V+)	10V ~ 30V	10V ~ 30V	13V ~ 36V	13V ~ 36V	5V ~ 34V	5V ~ 34V
Voltage - Supply, Dual (V±)	±4.5V ~ 20V	±4.5V ~ 20V	±7V ~ 22V	±7V ~ 22V	±5V ~ 17V	±5V ~ 17V
Switch Time (Ton, Toff) (Max)	150ns, 100ns	150ns, 100ns	150ns, 100ns	150ns, 100ns	150ns, 100ns	150ns, 100ns
Charge Injection	10pC	10pC	60pC	60pC	60pC	60pC
Channel Capacitance (CS(off), CD(off))	12pF, 12pF	12pF, 12pF	12pF, 12pF	12pF, 12pF	12pF, 12pF	12pF, 12pF
Current - Leakage (IS(off)) (Max)	500pA	500pA	500pA	500pA	500pA	500pA
Crosstalk	-90dB @ 1MHz	-90dB @ 1MHz	-94.8dB @ 1MHz	-94.8dB @ 1MHz	-90dB @ 1MHz	-90dB @ 1MHz
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	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)
RoHS Status	RoHS non-compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

For New Designs and Active Production:

DG401CY+ (Analog Devices Inc./Maxim Integrated) is the primary recommended substitute. It maintains identical electrical specifications to the original DG401CY while offering active product status and RoHS3 compliance. This part is suitable for applications requiring continuity with the original design without modification.

DG401DY-E3 and DG401DY-T1-E3 (Vishay Siliconix) are alternative active substitutes. Both offer extended operating temperature range (-40°C to 85°C versus 0°C to 70°C) and improved crosstalk performance (-94.8dB versus -90dB @ 1MHz). DG401DY-T1-E3 is supplied in tape & reel packaging for high-volume production. These parts are suitable when extended temperature performance is required.

For Legacy System Support:

DG401DYZ and DG401DYZ-T (Renesas Electronics Corporation) are classified as obsolete but remain available in inventory. These parts offer the widest single supply voltage range (5V ~ 34V) and dual supply range (±5V ~ 17V), making them suitable for legacy systems with broader voltage requirements. DG401DYZ-T is supplied in cut tape packaging. Note that these parts carry MSL 3 (168 Hours) moisture sensitivity versus MSL 1 for other substitutes.

Compliance Considerations:

All substitute parts except the original DG401CY are RoHS3 compliant. If RoHS compliance is a design requirement, DG401CY+ is the direct equivalent. The Vishay Siliconix variants (DG401DY-E3, DG401DY-T1-E3) provide the most favorable compliance and performance profile for new designs.

Frequently Asked Questions (FAQ)

Q: Can DG401CY+ be used as a direct replacement for DG401CY?

A: Yes. DG401CY+ maintains identical electrical specifications including on-state resistance (45Ohm), switch timing (150ns/100ns), leakage current (500pA), and channel capacitance (12pF). The 16-SOIC package and pinout are identical. The primary difference is active product status and RoHS3 compliance.

Q: What is the difference between DG401DY-E3 and DG401DY-T1-E3?

A: Both parts are electrically identical. The difference is packaging format: DG401DY-E3 is supplied in tube packaging, while DG401DY-T1-E3 is supplied in tape & reel (TR) format. Tape & reel packaging is standard for high-volume production and automated assembly.

Q: Why do DG401DYZ and DG401DYZ-T have different supply voltage ranges?

A: The supply voltage ranges reflect the specifications provided by Renesas Electronics Corporation for these parts. DG401DYZ and DG401DYZ-T support single supply voltage from 5V ~ 34V and dual supply from ±5V ~ 17V, which is broader than the original DG401CY specification (10V ~ 30V single, ±4.5V ~ 20V dual). This wider range may be beneficial for legacy systems but does not indicate superior performance.

Q: Are there any performance differences between the substitute parts?

A: Yes. Charge injection differs: DG401CY and DG401CY+ specify 10pC, while all Vishay and Renesas variants specify 60pC. Crosstalk performance is superior in Vishay parts (-94.8dB @ 1MHz) compared to the original and Renesas variants (-90dB @ 1MHz). Operating temperature range is extended in Vishay and Renesas parts (-40°C ~ 85°C) versus the original (0°C ~ 70°C). These differences must be evaluated against specific application requirements.

Q: What is the significance of MSL 3 (168 Hours) for DG401DYZ and DG401DYZ-T?

A: Moisture Sensitivity Level (MSL) 3 indicates that these parts must be used within 168 hours of opening the original packaging if exposed to ambient humidity. MSL 1 (unlimited) parts have no time restriction. For applications with extended storage or delayed assembly, MSL 1 parts (DG401CY+, DG401DY-E3, DG401DY-T1-E3) are preferred.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes, all substitute parts use the identical 16-SOIC package with the same pinout and footprint. No PCB redesign is required. However, circuit performance may vary slightly due to differences in charge injection and crosstalk specifications. Applications sensitive to these parameters should be evaluated individually.

Q: Which substitute part should be selected for new production?

A: DG401CY+ is recommended for direct replacement with no design changes. For new designs where extended temperature performance is beneficial, DG401DY-E3 or DG401DY-T1-E3 (Vishay Siliconix) are preferred due to active product status, RoHS3 compliance, and superior crosstalk performance. DG401DY-T1-E3 is the optimal choice for high-volume automated assembly.

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