DG445DY Equivalent & Substitute Parts

Part Overview

The DG445DY is a 4-circuit SPST-NO analog switch IC manufactured by Analog Devices Inc./Maxim Integrated, housed in a 16-SOIC surface mount package. This component features 85Ohm on-state resistance and operates across single supply (10V–30V) or dual supply (±4.5V–±20V) configurations. The DG445DY is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NO
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, 170ns
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 eligibility for the DG445DY is determined by the following critical parameters:

Switch Circuit Type & Configuration: Must be SPST-NO with 1:1 multiplexer/demultiplexer ratio and 4 circuits
On-State Resistance: 85Ohm maximum (direct equivalents) or lower resistance alternatives (35Ohm–80Ohm) for applications tolerant of reduced impedance
Package & Mounting: 16-SOIC surface mount form factor required for PCB compatibility
Operating Temperature Range: -40°C to 85°C minimum
Supply Voltage Compatibility: Single supply 10V–30V or dual supply ±4.5V–±20V

Substitute parts are grouped into three categories:

Direct Equivalents (Identical Resistance): Parts maintaining 85Ohm on-state resistance with matching electrical characteristics and active product status.

Parametric Equivalents (Lower Resistance): Parts with 35Ohm or 80Ohm on-state resistance, suitable for applications where lower impedance improves signal integrity or reduces power dissipation.

Manufacturer Alternatives: Parts from different manufacturers (Vishay Siliconix, Renesas Electronics) meeting core functional requirements within the same package.

Parameter Comparison

Part Number	Manufacturer	On-State Resistance (Max)	Supply Single (V+)	Supply Dual (V±)	Switch Time Ton/Toff (Max)	Charge Injection	Leakage Current (Max)	Crosstalk	Product Status	RoHS Status	Packaging
DG445DY	Analog Devices Inc./Maxim Integrated	85Ohm	10V ~ 30V	±4.5V ~ ±20V	250ns, 170ns	5pC	500pA	-100dB @ 1MHz	Obsolete	RoHS non-compliant	16-SOIC
DG445DY+	Analog Devices Inc./Maxim Integrated	85Ohm	10V ~ 30V	±4.5V ~ ±20V	250ns, 170ns	5pC	500pA	-100dB @ 1MHz	Active	ROHS3 Compliant	Tube
DG442DY+	Analog Devices Inc./Maxim Integrated	85Ohm	10V ~ 30V	±4.5V ~ ±20V	250ns, 170ns	5pC	500pA	-100dB @ 1MHz	Active	ROHS3 Compliant	Tube
DG412DY-E3	Vishay Siliconix	35Ohm	5V ~ 44V	±5V ~ ±20V	175ns, 145ns	5pC	250pA	-85dB @ 1MHz	Active	ROHS3 Compliant	Tube
DG412DY-T1-E3	Vishay Siliconix	35Ohm	5V ~ 44V	±5V ~ ±20V	175ns, 145ns	5pC	250pA	-85dB @ 1MHz	Active	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®
DG445BDY-E3	Vishay Siliconix	80Ohm	13V ~ 36V	±7V ~ ±22V	300ns, 200ns	1pC	500pA	-95dB @ 100kHz	Active	ROHS3 Compliant	Tube
DG445BDY-T1-E3	Vishay Siliconix	80Ohm	13V ~ 36V	±7V ~ ±22V	300ns, 200ns	1pC	500pA	-95dB @ 100kHz	Active	ROHS3 Compliant	Tape & Reel (TR)
DG445DY-E3	Vishay Siliconix	85Ohm	5V ~ 36V	±5V ~ ±20V	250ns, 210ns	-1pC	500pA	-100dB @ 1MHz	Active	ROHS3 Compliant	Tube
DG445DY-T1-E3	Vishay Siliconix	85Ohm	5V ~ 36V	±5V ~ ±20V	250ns, 210ns	-1pC	500pA	-100dB @ 1MHz	Active	ROHS3 Compliant	Tape & Reel (TR)
DG445DYZ	Renesas Electronics Corporation	85Ohm	5V ~ 34V	±5V ~ ±22V	250ns, 210ns	-1pC	500pA	-100dB @ 1MHz	Active	ROHS3 Compliant	Bulk
DG445DYZ-T	Renesas Electronics Corporation	85Ohm	5V ~ 34V	±5V ~ ±22V	250ns, 210ns	-1pC	500pA	-100dB @ 1MHz	Active	ROHS3 Compliant	Tape & Reel (TR)

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance)

DG445DY+ is the primary direct equivalent, maintaining identical on-state resistance (85Ohm), switching characteristics, and supply voltage ranges. It is manufactured by Analog Devices Inc./Maxim Integrated with active product status and ROHS3 compliance, addressing the obsolescence of the original DG445DY. Available in Tube packaging with 4345 units in stock.

DG442DY+ provides equivalent electrical performance with active status and ROHS3 compliance. Suitable for applications requiring the same 85Ohm impedance and switching speed profile.

For Lower Impedance Applications

DG412DY-E3 and DG412DY-T1-E3 (Vishay Siliconix) offer 35Ohm on-state resistance, reducing signal path impedance and power dissipation. These parts support wider single supply range (5V–44V) and faster switching times (175ns/145ns). Packaging options include Tube and Cut Tape & Digi-Reel®. DG412DY-T1-E3 has higher inventory (20450 units).

For Near-Equivalent Resistance with Extended Supply Range

DG445BDY-E3 and DG445BDY-T1-E3 (Vishay Siliconix) maintain 80Ohm on-state resistance with extended single supply range (13V–36V) and dual supply range (±7V–±22V). Slower switching times (300ns/200ns) and lower charge injection (1pC) suit applications prioritizing low noise over speed. Available in Tube and Tape & Reel packaging.

For Vishay Siliconix Direct Equivalents

DG445DY-E3 and DG445DY-T1-E3 maintain 85Ohm resistance with extended single supply range (5V–36V), lower charge injection (-1pC), and ROHS3 compliance. Available in Tube and Tape & Reel formats with 1445 and 18594 units respectively.

For Renesas Electronics Alternatives

DG445DYZ and DG445DYZ-T (Renesas Electronics Corporation) provide 85Ohm on-state resistance with ROHS3 compliance and active status. Supply ranges are 5V–34V (single) and ±5V–±22V (dual). MSL rating is 3 (168 Hours). Available in Bulk and Tape & Reel packaging.

All substitute parts maintain the 16-SOIC surface mount package, -40°C to 85°C operating temperature range, and 4-circuit SPST-NO configuration required for PCB compatibility.

Frequently Asked Questions (FAQ)

Q: Can DG445DY+ be used as a direct replacement for DG445DY?

A: Yes. DG445DY+ maintains identical electrical specifications: 85Ohm on-state resistance, 4-circuit SPST-NO configuration, 16-SOIC package, and -40°C to 85°C operating temperature. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant). Packaging differs (Tube vs. unspecified in original), but electrical performance is equivalent.

Q: What is the difference between DG445DY-E3 and DG445DY-T1-E3?

A: Both are manufactured by Vishay Siliconix with identical electrical specifications (85Ohm resistance, 250ns/210ns switching times, -1pC charge injection). The difference is packaging: DG445DY-E3 is supplied in Tube format (1445 units available), while DG445DY-T1-E3 is supplied in Tape & Reel (TR) format (18594 units available). Selection depends on assembly process requirements and volume needs.

Q: Can DG412DY-T1-E3 replace DG445DY in all applications?

A: DG412DY-T1-E3 is a parametric equivalent with lower on-state resistance (35Ohm vs. 85Ohm), faster switching (175ns/145ns vs. 250ns/170ns), and wider single supply range (5V–44V vs. 10V–30V). It is suitable for applications where lower impedance improves performance. However, the reduced resistance and different switching characteristics may affect circuit behavior in designs optimized for 85Ohm impedance. Circuit validation is necessary for applications with tight impedance or timing specifications.

Q: What is the significance of the DG445BDY variants?

A: DG445BDY-E3 and DG445BDY-T1-E3 offer 80Ohm on-state resistance (close to the original 85Ohm) with extended supply voltage ranges (13V–36V single, ±7V–±22V dual). Slower switching times (300ns/200ns) and lower charge injection (1pC) make these parts suitable for low-noise applications where supply voltage headroom is available. Packaging options (Tube and Tape & Reel) accommodate different production workflows.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed are ROHS3 compliant. The original DG445DY is RoHS non-compliant. If RoHS compliance is a design requirement, any of the active substitute parts (DG445DY+, DG442DY+, DG412DY variants, DG445BDY variants, DG445DY-E3/T1-E3, or DG445DYZ variants) satisfy this requirement.

Q: What packaging options are available for high-volume production?

A: For high-volume assembly, Tape & Reel (TR) packaging is standard. DG445DY-T1-E3 (18594 units), DG412DY-T1-E3 (20450 units), DG445BDY-T1-E3 (3700 units), and DG445DYZ-T (1739 units) are available in TR format. Cut Tape & Digi-Reel® format is available for DG412DY-T1-E3. Tube packaging suits lower-volume or manual assembly workflows.

Q: How does charge injection affect circuit performance?

A: Charge injection is the amount of charge transferred to the signal path when the switch transitions. Lower charge injection reduces signal distortion and noise. The original DG445DY has 5pC charge injection. DG445BDY variants have 1pC (lower noise), while DG445DY-E3/T1-E3 and DG445DYZ variants have -1pC. For audio or precision analog applications, lower charge injection improves signal fidelity.

Q: What is the difference between single and dual supply operation?

A: Single supply operation (V+) requires a positive voltage referenced to ground. Dual supply operation (V±) uses both positive and negative voltages symmetrically around ground. The DG445DY supports both: 10V–30V single supply or ±4.5V–±20V dual supply. Substitute parts maintain or extend these ranges, allowing flexibility in power supply design.

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