DG411LDY-T1 Equivalent & Substitute Parts

Part Overview

The DG411LDY-T1 is a 4-circuit SPST-NC analog switch manufactured by Vishay Siliconix, designed for signal routing and multiplexing applications in the 16-SOIC package. This part operates across supply voltages of 2.7V to 12V (single supply) or ±3V to ±6V (dual supply), with an on-state resistance of 17Ohm and switching times of 19ns (Ton) and 12ns (Toff). The DG411LDY-T1 is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support.

Key Parameters

Parameter	DG411LDY-T1
Manufacturer	Vishay Siliconix
Switch Circuit	SPST - NC
Number of Circuits	4
Multiplexer/Demultiplexer Circuit	1:1
On-State Resistance (Max)	17Ohm
Voltage - Supply, Single (V+)	2.7V ~ 12V
Voltage - Supply, Dual (V±)	±3V ~ 6V
Switch Time Ton (Max)	19ns
Switch Time Toff (Max)	12ns
-3dB Bandwidth	280MHz
Charge Injection	5pC
Channel Capacitance CS(off)	5pF
Channel Capacitance CD(off)	6pF
Current - Leakage IS(off) (Max)	250pA
Crosstalk	-95dB @ 1MHz
Operating Temperature	-40°C ~ 85°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the DG411LDY-T1 is determined by the following critical parameters:

Functional Compatibility Requirements:

Switch circuit type: SPST - NC (Single Pole Single Throw - Normally Closed)
Number of circuits: 4
Multiplexer configuration: 1:1
Package type: 16-SOIC (0.154", 3.90mm Width)
Mounting type: Surface Mount

Electrical Performance Criteria:

On-state resistance tolerance (17Ohm baseline allows substitutes with higher resistance values in specific applications)
Supply voltage ranges (single and dual supply compatibility)
Switch timing characteristics (Ton, Toff)
Leakage current specifications
Operating temperature range (-40°C ~ 85°C minimum)

Compliance & Reliability:

RoHS3 compliance
MSL rating (1 or 2 acceptable for most applications)
REACH compliance status

Substitute parts are grouped into three categories based on on-state resistance: 35Ohm variants (ADG411BRZ series, DG411DYZ series), 45Ohm variants (DG411CY+ series, DG411DY+ series), and 4Ohm variants (MAX4604CSE+). Each group maintains the core 4-circuit SPST-NC topology and 16-SOIC package, with trade-offs in resistance, switching speed, and supply voltage ranges.

Parameter Comparison

Parameter	DG411LDY-T1	ADG411BRZ	DG411CY+	DG411DY+	DG411DYZ	MAX4604CSE+
Manufacturer	Vishay Siliconix	Analog Devices Inc.	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Renesas Electronics Corporation	Analog Devices Inc./Maxim Integrated
Switch Circuit	SPST - NC	SPST - NC	SPST - NC	SPST - NC	SPST - NC	SPST - NC
Number of Circuits	4	4	4	4	4	4
On-State Resistance (Max)	17Ohm	35Ohm	45Ohm	45Ohm	35Ohm	4Ohm
Voltage - Supply, Single (V+)	2.7V ~ 12V	12V	10V ~ 30V	10V ~ 30V	5V ~ 44V	4.5V ~ 36V
Voltage - Supply, Dual (V±)	±3V ~ 6V	±15V	±4.5V ~ 20V	±4.5V ~ 20V	±5V ~ 20V	±4.5V ~ 20V
Switch Time Ton (Max)	19ns	175ns	175ns	175ns	175ns	120ns
Switch Time Toff (Max)	12ns	145ns	145ns	145ns	145ns	130ns
Charge Injection	5pC	5pC	5pC	5pC	5pC	225pC
Channel Capacitance CS(off)	5pF	9pF	9pF	9pF	9pF	34pF
Channel Capacitance CD(off)	6pF	9pF	9pF	9pF	9pF	34pF
Current - Leakage IS(off) (Max)	250pA	250pA	250pA	250pA	100pA	500pA
Crosstalk	-95dB @ 1MHz	-85dB @ 1MHz	-85dB @ 1MHz	-85dB @ 1MHz	-85dB @ 1MHz	-60dB @ 1MHz
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C
Package / Case	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For Direct Replacement (Lowest Risk): DG411DY+ and DG411DY+T are the primary substitutes. Both maintain the extended operating temperature range (-40°C ~ 85°C), RoHS3 compliance, and MSL 1 rating. The 45Ohm on-state resistance represents a moderate increase from the original 17Ohm specification. These parts are active products with established supply chains.

For Extended Supply Voltage Range Applications: DG411DYZ and DG411DYZ-T (Renesas) support wider single-supply voltage ranges (5V ~ 44V) compared to the original 2.7V ~ 12V specification. These parts offer lower leakage current (100pA vs. 250pA) and maintain full temperature range operation. MSL rating is 2 (1 Year), requiring appropriate moisture control during storage and assembly.

For Lower On-State Resistance Requirements: MAX4604CSE+ provides the lowest on-state resistance (4Ohm) among active substitutes, suitable for applications requiring minimal signal attenuation. This part operates at 0°C ~ 70°C, restricting use to commercial temperature ranges. Charge injection (225pC) and channel capacitance (34pF) are significantly higher than the original specification.

For Higher Supply Voltage Tolerance: ADG411BRZ and ADG411BRZ-REEL (Analog Devices) support ±15V dual supply operation, exceeding the original ±3V ~ 6V specification. Single supply is limited to 12V. These parts are suitable for applications requiring higher voltage headroom with active product status and RoHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can DG411DY+ directly replace DG411LDY-T1 in all applications? A: DG411DY+ is functionally compatible in most applications. The primary difference is on-state resistance (45Ohm vs. 17Ohm). Applications sensitive to signal attenuation or requiring impedance matching below 45Ohm require circuit redesign or selection of MAX4604CSE+ (4Ohm). Both parts share the same 16-SOIC package, pin configuration, and operating temperature range.

Q: What is the impact of higher on-state resistance in substitute parts? A: Higher on-state resistance increases signal attenuation and power dissipation. For analog signal routing, this may require circuit compensation. For digital switching applications with high-impedance loads, the impact is typically negligible. Crosstalk performance degrades slightly in 35Ohm and 45Ohm variants compared to the original 17Ohm specification.

Q: Are packaging variants (Tube, Tape & Reel, Cut Tape) electrically equivalent? A: Yes. ADG411BRZ, ADG411BRZ-REEL, and ADG411BRZ-REEL7 are electrically identical. Packaging differences affect only handling, storage, and assembly processes. Selection depends on production volume and assembly equipment compatibility.

Q: Which substitute supports the widest operating temperature range? A: DG411DY+, DG411DY+T, DG411DYZ, and DG411DYZ-T all support -40°C ~ 85°C operation, matching the original specification. DG411CY+ and MAX4604CSE+ are limited to 0°C ~ 70°C commercial temperature range.

Q: What is the difference between DG411DYZ (Renesas) and DG411DY+ (Analog Devices/Maxim)? A: Both are 35Ohm/45Ohm variants with identical package and pin configuration. DG411DYZ offers wider single-supply voltage range (5V ~ 44V vs. 10V ~ 30V) and lower leakage current (100pA vs. 250pA). DG411DY+ provides tighter channel-to-channel matching (3Ohm max). Selection depends on specific supply voltage and leakage current requirements.

Q: Is MSL 2 (1 Year) acceptable for high-reliability applications? A: MSL 2 parts (DG411DYZ, DG411DYZ-T) require moisture control during storage and assembly. For applications with extended shelf life or high-humidity environments, MSL 1 parts (DG411DY+, ADG411BRZ) are preferred. MSL rating does not affect electrical performance after assembly.

Q: Can MAX4604CSE+ be used in low-voltage applications below 4.5V? A: No. MAX4604CSE+ minimum single-supply voltage is 4.5V. For applications requiring operation below 4.5V, DG411DY+ (10V ~ 30V single supply) or DG411DYZ (5V ~ 44V single supply) are not suitable either. The original DG411LDY-T1 specification (2.7V ~ 12V) cannot be fully matched by active substitutes; circuit redesign or alternative topologies may be necessary.

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