DG444DY Equivalent & Substitute Parts

Part Overview

The DG444DY is a 4-circuit SPST-NC (Single Pole Single Throw - Normally Closed) analog switch IC manufactured by Analog Devices Inc./Maxim Integrated in a 16-SOIC surface mount package. This part operates with 85Ohm on-state resistance and supports both single supply (10V to 30V) and dual supply (±4.5V to ±20V) configurations. The DG444DY is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Active alternatives with compatible or improved electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NC (Single Pole Single Throw - Normally Closed)
Number of Circuits	4
Multiplexer/Demultiplexer Configuration	1:1
On-State Resistance (Max)	85Ohm
Channel-to-Channel Matching (ΔRon)	4Ohm (Max)
Voltage - Supply, Single (V+)	10V ~ 30V
Voltage - Supply, Dual (V±)	±4.5V ~ 20V
Switch Time (Ton, Toff) (Max)	250ns, 140ns
Charge Injection	5pC
Channel Capacitance (CS(off), CD(off))	4pF, 4pF
Current - Leakage (IS(off)) (Max)	500pA
Crosstalk	-100dB @ 1MHz
Operating Temperature	-40°C ~ 85°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 for the DG444DY is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Switch circuit type: SPST - NC
Number of circuits: 4
Multiplexer/Demultiplexer configuration: 1:1
Package / Case: 16-SOIC (0.154", 3.90mm Width)
Mounting type: Surface Mount
Operating temperature range: -40°C ~ 85°C (TA)

Electrical Performance Parameters (Allowable Variation):

On-state resistance: 35Ohm to 85Ohm
Supply voltage ranges: Single supply 5V minimum to 44V maximum; Dual supply ±5V minimum to ±22V maximum
Switch timing: Ton and Toff within acceptable application limits
Leakage current: 250pA to 500pA
Crosstalk: -85dB or better @ specified frequency

Substitute parts are grouped into three categories based on on-state resistance: 35Ohm (DG411 series), 70Ohm (ADG444 series), and 80-85Ohm (DG444 series variants). All substitutes maintain the same package footprint and pin configuration, enabling direct PCB replacement.

Parameter Comparison

Part Number	Manufacturer	On-State Resistance (Max)	V+ Supply	V± Supply	Ton/Toff (Max)	Leakage (Max)	Crosstalk	Product Status	RoHS Status	Packaging
DG444DY	Analog Devices Inc./Maxim Integrated	85Ohm	10V ~ 30V	±4.5V ~ 20V	250ns, 140ns	500pA	-100dB @ 1MHz	Obsolete	RoHS non-compliant	Tube
DG444DY+	Analog Devices Inc./Maxim Integrated	85Ohm	10V ~ 30V	±4.5V ~ 20V	250ns, 140ns	500pA	-100dB @ 1MHz	Active	ROHS3 Compliant	Tube
ADG444BRZ	Analog Devices Inc.	70Ohm	12V	±15V	110ns, 60ns	500pA	-100dB @ 1MHz	Active	ROHS3 Compliant	Tube
ADG444BRZ-REEL	Analog Devices Inc.	70Ohm	12V	±15V	110ns, 60ns	500pA	-100dB @ 1MHz	Active	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®
DG411DY-E3	Vishay Siliconix	35Ohm	5V ~ 44V	±5V ~ 20V	175ns, 145ns	250pA	-85dB @ 1MHz	Active	ROHS3 Compliant	Tube
DG411DY-T1-E3	Vishay Siliconix	35Ohm	5V ~ 44V	±5V ~ 20V	175ns, 145ns	250pA	-85dB @ 1MHz	Active	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®
DG444BDY-E3	Vishay Siliconix	80Ohm	13V ~ 36V	±7V ~ 22V	300ns, 200ns	500pA	-95dB @ 100kHz	Active	ROHS3 Compliant	Tube
DG444BDY-T1-E3	Vishay Siliconix	80Ohm	13V ~ 36V	±7V ~ 22V	300ns, 200ns	500pA	-95dB @ 100kHz	Active	ROHS3 Compliant	Tape & Reel (TR)
DG444DY-E3	Vishay Siliconix	85Ohm	5V ~ 36V	±5V ~ 20V	250ns, 140ns	500pA	-100dB @ 1MHz	Active	ROHS3 Compliant	Tube
DG444DY-T1-E3	Vishay Siliconix	85Ohm	5V ~ 36V	±5V ~ 20V	250ns, 140ns	500pA	-100dB @ 1MHz	Active	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®
DG444DYZ	Renesas Electronics Corporation	85Ohm	5V ~ 34V	±5V ~ 22V	250ns, 140ns	500pA	-100dB @ 1MHz	Active	ROHS3 Compliant	Tube

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Performance): DG444DY+ is the primary direct replacement. It maintains identical electrical specifications and on-state resistance while offering active product status and ROHS3 compliance. The only difference is packaging format (Tube vs. original specification).

Vishay Siliconix DG444 Series (DG444DY-E3, DG444DY-T1-E3): These parts provide exact electrical equivalence to the original DG444DY with 85Ohm on-state resistance, identical switching characteristics, and expanded supply voltage ranges (5V minimum vs. 10V minimum). Both are ROHS3 compliant and available in Tube or Cut Tape & Digi-Reel® packaging.

Renesas DG444DYZ: Functionally equivalent with 85Ohm on-state resistance and identical switching performance. Offers expanded dual supply range (±5V to ±22V) and ROHS3 compliance. MSL rating is 3 (168 Hours) versus MSL 1 for other variants.

Vishay Siliconix DG444 Series with 80Ohm Resistance (DG444BDY-E3, DG444BDY-T1-E3): Suitable for applications where 80Ohm on-state resistance is acceptable. Provides extended supply voltage ranges and ROHS3 compliance. Switch timing is slightly slower (300ns/200ns vs. 250ns/140ns).

Analog Devices ADG444BRZ Series (70Ohm): Lower on-state resistance (70Ohm) with faster switching times (110ns/60ns). Restricted to 12V single supply and ±15V dual supply. Suitable only for applications within these voltage constraints.

Vishay Siliconix DG411 Series (35Ohm): Lowest on-state resistance with superior leakage performance (250pA vs. 500pA). Widest supply voltage range (5V to 44V single supply). Acceptable for applications where lower on-state resistance is beneficial and crosstalk specification of -85dB @ 1MHz is sufficient.

Frequently Asked Questions (FAQ)

Q: Can DG444DY+ be used as a direct replacement for DG444DY? A: Yes. DG444DY+ is electrically identical with the same 85Ohm on-state resistance, switching characteristics, and supply voltage ranges. It is the recommended replacement due to active product status and ROHS3 compliance.

Q: What is the difference between DG444DY-E3 and DG444DY-T1-E3? A: Both are Vishay Siliconix equivalents with identical electrical specifications. The difference is packaging: DG444DY-E3 is supplied in Tube format, while DG444DY-T1-E3 is supplied in Cut Tape (CT) & Digi-Reel® format. Select based on assembly process requirements.

Q: Can I use DG411DY-E3 (35Ohm) instead of DG444DY (85Ohm)? A: DG411DY-E3 is electrically compatible in terms of package, pin configuration, and circuit topology. However, the significantly lower on-state resistance (35Ohm vs. 85Ohm) will alter circuit behavior. Use only if your application benefits from lower on-state resistance and can tolerate the different electrical characteristics.

Q: What is the impact of using ADG444BRZ with restricted supply voltage (12V single, ±15V dual)? A: ADG444BRZ operates only at these fixed supply voltages. If your design requires the flexible supply range of the original DG444DY (10V to 30V single supply), ADG444BRZ is not suitable. Verify your actual supply voltage requirements before selection.

Q: Are all substitute parts RoHS compliant? A: All substitute parts listed are ROHS3 compliant except the original DG444DY, which is RoHS non-compliant. This is a key advantage of migration to active alternatives.

Q: Does MSL rating affect part selection? A: MSL (Moisture Sensitivity Level) affects storage and handling requirements. DG444DYZ has MSL 3 (168 Hours), requiring more stringent moisture control compared to MSL 1 (Unlimited) parts. Select based on your manufacturing environment and storage capabilities.

Q: Can I mix different substitute parts in the same design? A: All substitutes maintain identical 16-SOIC package footprint and pin configuration, enabling interchangeability at the PCB level. However, verify that your circuit design can tolerate the electrical parameter variations (on-state resistance, supply voltage ranges, switching times) of each part before mixing.

Q: Which substitute offers the best overall performance? A: Selection depends on application requirements. DG444DY-E3 or DG444DY-T1-E3 provide the closest electrical match with expanded supply voltage range. DG411DY series offers superior leakage performance. ADG444BRZ offers fastest switching but with restricted supply voltages.

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