DG309DY Equivalent & Substitute Parts

Part Overview

The DG309DY is a 4-circuit SPST-NC (Normally Closed) analog switch IC manufactured by Vishay Siliconix, housed in a 16-SOIC surface mount package. This interface component features 85Ohm on-state resistance and operates across a wide supply voltage range of 4V to 44V (single supply) or ±4V to ±22V (dual supply). The DG309DY is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Active alternatives with comparable or enhanced electrical characteristics are available from Vishay Siliconix and Analog Devices Inc./Maxim Integrated.

Key Parameters

Parameter	DG309DY
Manufacturer	Vishay Siliconix
Switch Circuit	SPST - NC
Number of Circuits	4
Multiplexer/Demultiplexer Circuit	1:1
On-State Resistance (Max)	85Ohm
Channel-to-Channel Matching (ΔRon)	1.7Ohm
Voltage - Supply, Single (V+)	4V ~ 44V
Voltage - Supply, Dual (V±)	±4V ~ 22V
Switch Time (Ton, Toff) (Max)	200ns, 150ns
Charge Injection	1pC
Channel Capacitance (CS(off), CD(off))	5pF, 5pF
Current - Leakage (IS(off)) (Max)	500pA
Crosstalk	-95dB @ 100kHz
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	16-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the DG309DY is determined by the following critical parameters:

Switch topology: SPST-NC (Normally Closed) configuration with 4 circuits
Package compatibility: 16-SOIC surface mount form factor
On-state resistance range: 85Ohm nominal (acceptable range 85Ohm to 160Ohm for most applications)
Supply voltage compatibility: Minimum 4V single supply or ±4V dual supply capability
Operating temperature range: -40°C to 85°C
Leakage current specification: 500pA maximum

Substitute parts are grouped into two categories:

Direct Parametric Equivalents maintain identical electrical specifications (85Ohm on-state resistance, 1:1 multiplexing, 4 circuits) with improved product status and RoHS compliance. These include DG309BDY-E3 and DG309DY-E3 from Vishay Siliconix.

Functional Alternatives provide the same switch topology and package but with variations in on-state resistance (25Ohm to 160Ohm), supply voltage ranges, or switching speed. These alternatives from Analog Devices Inc./Maxim Integrated (MAX364ESE+, MAX4511 series, MAX4711CSE+) and Advanced Linear Devices Inc. (ALD4211SCL) are suitable when application requirements permit parameter deviations.

Parameter Comparison

Part Number	Manufacturer	Product Status	On-State Resistance (Max)	Voltage - Supply, Single (V+)	Voltage - Supply, Dual (V±)	Switch Time (Ton, Toff) (Max)	Operating Temperature	RoHS Status	Packaging
DG309DY	Vishay Siliconix	Obsolete	85Ohm	4V ~ 44V	±4V ~ 22V	200ns, 150ns	-40°C ~ 85°C	RoHS non-compliant	16-SOIC
DG309BDY-E3	Vishay Siliconix	Active	85Ohm	4V ~ 44V	±4V ~ 22V	200ns, 150ns	-40°C ~ 85°C	ROHS3 Compliant	16-SOIC
DG309DY-E3	Vishay Siliconix	Active	85Ohm	4V ~ 44V	±4V ~ 22V	200ns, 150ns	-40°C ~ 85°C	ROHS3 Compliant	16-SOIC
MAX364ESE+	Analog Devices Inc./Maxim Integrated	Active	85Ohm	10V ~ 30V	±4.5V ~ 20V	250ns, 120ns	-40°C ~ 85°C	ROHS3 Compliant	16-SOIC
MAX4711CSE+	Analog Devices Inc./Maxim Integrated	Active	25Ohm	2.7V ~ 11V	±2.7V ~ 5.5V	125ns, 80ns	0°C ~ 70°C	ROHS3 Compliant	16-SOIC
MAX4511CSE+	Analog Devices Inc./Maxim Integrated	Active	160Ohm	9V ~ 36V	±4.5V ~ 18V	500ns, 400ns	0°C ~ 70°C	ROHS3 Compliant	16-SOIC
MAX4511CSE+T	Analog Devices Inc./Maxim Integrated	Active	160Ohm	9V ~ 36V	±4.5V ~ 18V	500ns, 400ns	0°C ~ 70°C	ROHS3 Compliant	16-SOIC
MAX4511ESE+	Analog Devices Inc./Maxim Integrated	Active	160Ohm	9V ~ 36V	±4.5V ~ 18V	500ns, 400ns	-40°C ~ 85°C	ROHS3 Compliant	16-SOIC
MAX4511ESE+T	Analog Devices Inc./Maxim Integrated	Active	160Ohm	9V ~ 36V	±4.5V ~ 18V	500ns, 400ns	-40°C ~ 85°C	ROHS3 Compliant	16-SOIC
ALD4211SCL	Advanced Linear Devices Inc.	Active	135Ohm	3V ~ 12V	±1.5V ~ 6V	130ns, 130ns	-40°C ~ 85°C	ROHS3 Compliant	16-SOIC
DG309DY+	Analog Devices Inc./Maxim Integrated	Active	100Ohm	5V ~ 30V	±5V ~ 20V	250ns, 150ns	-40°C ~ 85°C	ROHS3 Compliant	16-SOIC

Engineering Selection Recommendations

For Direct Replacement with RoHS Compliance:

DG309BDY-E3 and DG309DY-E3 are the primary substitutes for the obsolete DG309DY. Both parts maintain identical electrical specifications (85Ohm on-state resistance, 4V to 44V single supply, ±4V to ±22V dual supply, -40°C to 85°C operating range) and 16-SOIC packaging. Both are ROHS3 compliant and carry active product status, making them suitable for new designs and production continuity.

For Extended Supply Voltage Range:

MAX364ESE+ provides 85Ohm on-state resistance matching with extended single supply range (10V to 30V) and improved crosstalk performance (-100dB @ 1MHz). Operating temperature range remains -40°C to 85°C. This part is suitable when higher minimum supply voltages are acceptable.

For Low-Resistance Applications:

MAX4711CSE+ offers significantly lower on-state resistance (25Ohm) with faster switching times (125ns, 80ns) and lower charge injection (25pC). Supply voltage range is reduced to 2.7V to 11V single supply. Operating temperature is limited to 0°C to 70°C. This part is appropriate for low-impedance signal switching applications with restricted temperature requirements.

For Higher On-State Resistance Tolerance:

MAX4511 series (CSE+, CSE+T, ESE+, ESE+T variants) feature 160Ohm on-state resistance with supply voltage range of 9V to 36V single supply. The ESE+ and ESE+T variants maintain -40°C to 85°C operating temperature. Packaging options include Tube (CSE+, ESE+) and Tape & Reel (CSE+T, ESE+T). These parts are suitable when higher on-state resistance is acceptable and higher supply voltages are required.

For Moderate Parameter Variation:

ALD4211SCL from Advanced Linear Devices Inc. provides 135Ohm on-state resistance with reduced supply voltage range (3V to 12V single supply, ±1.5V to ±6V dual supply) and faster switching times (130ns, 130ns). Operating temperature range is -40°C to 85°C. This part is suitable for lower-voltage applications with moderate resistance tolerance.

For Intermediate Resistance with Extended Temperature:

DG309DY+ (Analog Devices Inc./Maxim Integrated) offers 100Ohm on-state resistance with supply voltage range of 5V to 30V single supply and -40°C to 85°C operating temperature. This part provides a middle ground between the original DG309DY and higher-resistance alternatives.

Frequently Asked Questions (FAQ)

Q: Can DG309BDY-E3 or DG309DY-E3 be used as direct drop-in replacements for the obsolete DG309DY?

A: Yes. Both parts maintain identical on-state resistance (85Ohm), supply voltage ranges (4V to 44V single, ±4V to ±22V dual), operating temperature (-40°C to 85°C), and 16-SOIC package. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant). Electrical performance and pinout are equivalent.

Q: What is the key difference between MAX4511CSE+ and MAX4511ESE+?

A: Both parts have identical electrical specifications (160Ohm on-state resistance, 9V to 36V single supply, ±4.5V to ±18V dual supply, 500ns/400ns switching times). The primary difference is operating temperature range: MAX4511CSE+ operates 0°C to 70°C, while MAX4511ESE+ operates -40°C to 85°C. For applications requiring extended low-temperature operation, MAX4511ESE+ is required.

Q: What is the difference between Tube and Tape & Reel packaging for MAX4511 parts?

A: Tube packaging (CSE+, ESE+) is suitable for lower-volume applications and manual assembly. Tape & Reel packaging (CSE+T, ESE+T) is designed for high-volume automated pick-and-place assembly. Electrical specifications are identical; packaging choice depends on production volume and assembly equipment.

Q: Can MAX4711CSE+ replace DG309DY in all applications?

A: No. While MAX4711CSE+ maintains the same 4-circuit SPST-NC topology and 16-SOIC package, it has significantly different electrical characteristics: 25Ohm on-state resistance (vs. 85Ohm), 2.7V to 11V supply range (vs. 4V to 44V), and 0°C to 70°C operating temperature (vs. -40°C to 85°C). Substitution is only valid when application requirements permit these parameter deviations.

Q: Is the DG309DY+ part number the same as the original DG309DY?

A: No. DG309DY+ is a different part manufactured by Analog Devices Inc./Maxim Integrated with different electrical specifications: 100Ohm on-state resistance (vs. 85Ohm), 5V to 30V supply range (vs. 4V to 44V), and different charge injection characteristics. The "+" suffix indicates a variant, not an equivalent.

Q: Which substitute part has the best crosstalk performance?

A: MAX364ESE+ provides the best crosstalk performance at -100dB @ 1MHz, compared to the original DG309DY at -95dB @ 100kHz. This improved performance may be beneficial in high-frequency signal applications.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant. The original DG309DY is RoHS non-compliant. For applications requiring RoHS compliance, any of the listed substitutes are suitable.

Q: What is the impact of on-state resistance variation among substitute parts?

A: On-state resistance directly affects signal attenuation and power dissipation. Lower resistance (MAX4711CSE+ at 25Ohm) reduces signal loss but may not be suitable for all impedance-matching requirements. Higher resistance (MAX4511 series at 160Ohm) increases signal attenuation. Selection depends on circuit impedance requirements and acceptable signal loss specifications.

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