DG641DY Equivalent & Substitute Parts

Part Overview

The DG641DY is a 4-circuit SPST-NO (Normally Open) analog switch IC manufactured by Vishay Siliconix, housed in a 16-SOIC surface mount package. This component is classified as obsolete, indicating that direct procurement may become increasingly difficult. The part operates with supply voltages ranging from 3V to 15V (single supply) or ±3V to ±15V (dual supply), with a maximum on-state resistance of 15Ohm and switching times of 70ns (Ton) and 50ns (Toff). Finding equivalent or substitute parts is necessary due to the obsolete product status and potential supply chain constraints.

Key Parameters

Parameter	DG641DY Value
Switch Circuit Type	SPST - NO (Normally Open)
Number of Circuits	4
Multiplexer/Demultiplexer Circuit	1:1
On-State Resistance (Max)	15Ohm
Channel-to-Channel Matching (ΔRon)	1Ohm
Voltage - Supply, Single (V+)	3V ~ 15V
Voltage - Supply, Dual (V±)	±3V ~ 15V
Switch Time (Ton, Toff) (Max)	70ns, 50ns
-3dB Bandwidth	500MHz
Charge Injection	19pC
Channel Capacitance (CS(off), CD(off))	12pF, 12pF
Current - Leakage (IS(off)) (Max)	10nA
Crosstalk	-87dB @ 5MHz
Operating Temperature	-40°C ~ 85°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the DG641DY is constrained by the following critical parameters:

Mandatory Compatibility Criteria:

Package type: 16-SOIC surface mount (0.154", 3.90mm Width)
Circuit configuration: 4 independent circuits with 1:1 multiplexer/demultiplexer topology
Operating temperature range: Minimum -40°C to 85°C
Supply voltage compatibility: Must support the application's voltage requirements

Functional Considerations: The DG641DY operates as a SPST-NO (Normally Open) switch. Substitute parts may employ different switch circuit topologies (such as SPST-NC, Normally Closed) depending on application requirements. The on-state resistance, switching speed, bandwidth, charge injection, and leakage current are secondary parameters that determine performance characteristics but do not prevent substitution if the primary criteria are met.

Available Substitutes: Two parts meet the core package and circuit count requirements: DG611EEY-T1-GE3 (Vishay Siliconix, SPST-NC topology) and ADG201AKRZ (Analog Devices Inc., SPST-NC topology). Both are active products with improved compliance status compared to the obsolete DG641DY.

Parameter Comparison

Parameter	DG641DY	DG611EEY-T1-GE3	ADG201AKRZ
Manufacturer	Vishay Siliconix	Vishay Siliconix	Analog Devices Inc.
Switch Circuit Type	SPST - NO	SPST - NC	SPST - NC
Number of Circuits	4	4	4
Multiplexer/Demultiplexer Circuit	1:1	1:1	1:1
On-State Resistance (Max)	15Ohm	115Ohm	90Ohm
Channel-to-Channel Matching (ΔRon)	1Ohm	600mOhm	4.5Ohm
Voltage - Supply, Single (V+)	3V ~ 15V	3V ~ 12V	10V ~ 15V
Voltage - Supply, Dual (V±)	±3V ~ 15V	±3V ~ 5V	±10V ~ 15V
Switch Time (Ton, Toff) (Max)	70ns, 50ns	50ns, 35ns	300ns, 250ns
-3dB Bandwidth	500MHz	1GHz	Not specified
Charge Injection	19pC	1.4pC	20pC
Channel Capacitance (CS(off), CD(off))	12pF, 12pF	3pF, 3pF	5pF
Current - Leakage (IS(off)) (Max)	10nA	100pA	2nA
Crosstalk	-87dB @ 5MHz	-74dB @ 10MHz	-80dB @ 100kHz
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C
Package / Case	16-SOIC	16-SOIC	16-SOIC
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

DG611EEY-T1-GE3 (Vishay Siliconix): This part is an active product with ROHS3 compliance and extended operating temperature range (-40°C to 125°C). It maintains the same manufacturer lineage as the DG641DY and identical package configuration. The primary trade-off is the switch circuit topology change from SPST-NO to SPST-NC and increased on-state resistance (115Ohm vs. 15Ohm). Selection of this part is appropriate for applications where the normally-closed configuration is acceptable and supply voltage is limited to 3V–12V (single) or ±3V–±5V (dual).

ADG201AKRZ (Analog Devices Inc.): This part is an active product with ROHS3 compliance and identical operating temperature range to the DG641DY (-40°C to 85°C). It employs SPST-NC topology with 90Ohm on-state resistance. The supply voltage requirement is narrower (10V–15V single or ±10V–±15V dual), making it suitable only for applications operating within this voltage window. Switching times are significantly longer (300ns/250ns vs. 70ns/50ns), which may impact high-speed applications.

Both substitutes are active products with improved regulatory compliance compared to the obsolete DG641DY. Selection depends on circuit topology requirements (NO vs. NC), supply voltage constraints, and switching speed performance needs.

Frequently Asked Questions (FAQ)

Q: Can the DG641DY be directly replaced with DG611EEY-T1-GE3 or ADG201AKRZ?

A: Direct replacement requires verification of circuit topology compatibility. The DG641DY is a SPST-NO (Normally Open) switch, while both substitutes are SPST-NC (Normally Closed) switches. This functional difference must be evaluated against the application circuit design. Both substitutes share the same 16-SOIC package and 4-circuit configuration.

Q: What are the key differences in electrical performance?

A: The DG641DY has the lowest on-state resistance (15Ohm) and fastest switching times (70ns/50ns). The DG611EEY-T1-GE3 offers superior bandwidth (1GHz vs. 500MHz) and lower charge injection (1.4pC vs. 19pC) but with higher on-state resistance (115Ohm). The ADG201AKRZ has moderate on-state resistance (90Ohm) but significantly slower switching times (300ns/250ns).

Q: Are there supply voltage compatibility issues?

A: Yes. The DG641DY supports 3V–15V (single) or ±3V–±15V (dual). The DG611EEY-T1-GE3 is limited to 3V–12V (single) or ±3V–±5V (dual). The ADG201AKRZ requires 10V–15V (single) or ±10V–±15V (dual). Applications using lower supply voltages (below 10V) must use the DG611EEY-T1-GE3 or remain with the DG641DY.

Q: What is the impact of the switch circuit topology change?

A: The DG641DY conducts when activated (NO configuration), while both substitutes block signal when activated (NC configuration). This requires circuit redesign or logic inversion in control signals. The choice between NO and NC depends entirely on the application's switching logic requirements.

Q: Are both substitutes RoHS compliant?

A: Yes. Both DG611EEY-T1-GE3 and ADG201AKRZ are ROHS3 compliant, whereas the DG641DY is RoHS non-compliant. This is relevant for applications subject to RoHS regulations or customer requirements.

Q: Which substitute is recommended for new designs?

A: Selection depends on specific application requirements. For applications requiring lower supply voltages and superior high-frequency performance, the DG611EEY-T1-GE3 is appropriate. For applications with higher supply voltages and less stringent switching speed requirements, the ADG201AKRZ is suitable. Both are active products with long-term availability.

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