DG309DY Equivalent & Substitute Parts

Part Overview

The DG309DY is a 4-circuit IC switch with SPST-NC (Single Pole Single Throw - Normally Closed) configuration, 100Ohm on-state resistance, and 16-SOIC surface mount packaging. Manufactured by Analog Devices Inc./Maxim Integrated, this part is classified as obsolete. Due to its obsolete status, equivalent and substitute parts with active product status are necessary for new designs and ongoing production requirements. Substitute parts maintain the same functional topology (4-circuit SPST-NC switch, 1:1 multiplexer/demultiplexer configuration) while offering improved electrical characteristics, enhanced compliance certifications, and extended availability.

Key Parameters

Parameter	DG309DY
Switch Circuit	SPST - NC
Number of Circuits	4
Multiplexer/Demultiplexer Circuit	1:1
On-State Resistance (Max)	100Ohm
Voltage - Supply, Single (V+)	5V ~ 30V
Voltage - Supply, Dual (V±)	±5V ~ 20V
Switch Time (Ton, Toff) (Max)	250ns, 150ns
Charge Injection	-10pC
Channel Capacitance (CS(off), CD(off))	11pF, 8pF
Current - Leakage (IS(off)) (Max)	5nA
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	16-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution logic is based on the following critical parameters that define functional equivalence:

Mandatory Matching Parameters:

Switch Circuit: SPST - NC
Number of Circuits: 4
Multiplexer/Demultiplexer Circuit: 1:1
Package / Case: 16-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount

Allowed Variation Parameters:

On-State Resistance (Max): Substitutes may have lower resistance values (improved performance)
Voltage Supply Ranges: Substitutes must support the original supply voltage range or broader ranges
Switch Time: Substitutes may have faster switching characteristics
Charge Injection: Substitutes may have lower absolute values
Channel Capacitance: Substitutes may have lower capacitance values
Current Leakage: Substitutes may have lower leakage current
Operating Temperature: Substitutes may support extended temperature ranges
Product Status: Active status preferred over obsolete
RoHS Status: ROHS3 Compliant preferred for regulatory compliance

Substitutes are grouped by on-state resistance value, as this is a primary performance differentiator while maintaining functional compatibility.

Parameter Comparison

Part Number	Manufacturer	On-State Resistance (Max)	Voltage - Supply, Single (V+)	Voltage - Supply, Dual (V±)	Switch Time (Ton, Toff) (Max)	Charge Injection	Current - Leakage (IS(off)) (Max)	Operating Temperature	Product Status	RoHS Status	Packaging
DG309DY	Analog Devices Inc./Maxim Integrated	100Ohm	5V ~ 30V	±5V ~ 20V	250ns, 150ns	-10pC	5nA	-40°C ~ 85°C	Obsolete	RoHS non-compliant	16-SOIC
DG309DY+	Analog Devices Inc./Maxim Integrated	100Ohm	5V ~ 30V	±5V ~ 20V	250ns, 150ns	-10pC	5nA	-40°C ~ 85°C	Active	ROHS3 Compliant	Tube
DG309BDY-E3	Vishay Siliconix	85Ohm	4V ~ 44V	±4V ~ 22V	200ns, 150ns	1pC	500pA	-40°C ~ 85°C	Active	ROHS3 Compliant	Tube
DG309BDY-T1-E3	Vishay Siliconix	85Ohm	4V ~ 44V	±4V ~ 22V	200ns, 150ns	1pC	500pA	-40°C ~ 85°C	Active	ROHS3 Compliant	Tape & Reel (TR)
DG309DY-E3	Vishay Siliconix	85Ohm	4V ~ 44V	±4V ~ 22V	200ns, 150ns	1pC	500pA	-40°C ~ 85°C	Active	ROHS3 Compliant	Tube
DG309DY-T1-E3	Vishay Siliconix	85Ohm	4V ~ 44V	±4V ~ 22V	200ns, 150ns	1pC	500pA	-40°C ~ 85°C	Active	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®
DG271BDY-E3	Vishay Siliconix	50Ohm	Not specified	±15V	65ns, 65ns	-5pC	1nA	-40°C ~ 85°C	Active	ROHS3 Compliant	Tube
DG271BDY-T1-E3	Vishay Siliconix	50Ohm	Not specified	±15V	65ns, 65ns	-5pC	1nA	-40°C ~ 85°C	Active	ROHS3 Compliant	Tape & Reel (TR)
DG454EY-T1-E3	Vishay Siliconix	5.3Ohm	12V ~ 36V	±5V ~ 15V	118ns, 97ns	22pC	500pA	-40°C ~ 125°C	Active	ROHS3 Compliant	Tape & Reel (TR)
ADG1311YRZ	Analog Devices Inc.	200Ohm	12V	±15V	125ns, 50ns	2pC	10nA	-40°C ~ 105°C	Active	ROHS3 Compliant	Tube

Engineering Selection Recommendations

Direct Replacement (100Ohm Resistance Class): DG309DY+ is the direct functional equivalent with identical electrical specifications. It maintains 100Ohm on-state resistance and all original voltage supply ranges. The primary advantage is active product status and ROHS3 compliance, eliminating obsolescence risk. Packaging options (Tube) differ from the original but maintain 16-SOIC form factor compatibility.

Lower Resistance Substitutes (85Ohm Resistance Class): DG309BDY-E3, DG309BDY-T1-E3, DG309DY-E3, and DG309DY-T1-E3 offer reduced on-state resistance (85Ohm), improved leakage current performance (500pA vs. 5nA), and extended supply voltage ranges (4V ~ 44V single supply, ±4V ~ 22V dual supply). These parts are suitable for applications requiring lower insertion loss. All are active with ROHS3 compliance. Packaging variants (Tube, Tape & Reel, Cut Tape & Digi-Reel) accommodate different procurement and assembly workflows.

Ultra-Low Resistance Substitute (5.3Ohm Resistance Class): DG454EY-T1-E3 provides significantly lower on-state resistance (5.3Ohm) with faster switching times (118ns, 97ns) and extended operating temperature range (-40°C ~ 125°C). This part is suitable for applications prioritizing minimal insertion loss and high-speed switching. Supply voltage range is narrower (12V ~ 36V single supply, ±5V ~ 15V dual supply), requiring verification against application requirements.

Lower Resistance Substitute (50Ohm Resistance Class): DG271BDY-E3 and DG271BDY-T1-E3 offer 50Ohm on-state resistance with fastest switching times (65ns, 65ns) and lowest leakage current (1nA). Dual supply voltage is fixed at ±15V; single supply voltage is not specified. These parts are suitable for precision analog switching applications requiring minimal charge injection and crosstalk. Packaging variants support different procurement methods.

Higher Resistance Substitute (200Ohm Resistance Class): ADG1311YRZ offers 200Ohm on-state resistance with improved channel-to-channel matching (5Ohm), extended operating temperature range (-40°C ~ 105°C), and superior crosstalk performance (-90dB @ 1MHz). Supply voltage is fixed at 12V single supply and ±15V dual supply. This part is suitable for applications where higher resistance is acceptable and enhanced temperature performance is required.

All substitute parts maintain the mandatory functional parameters: SPST-NC switch circuit, 4 circuits, 1:1 multiplexer/demultiplexer configuration, and 16-SOIC package. All active substitutes carry ROHS3 compliance certification.

Frequently Asked Questions (FAQ)

Q: Can DG309DY+ be used as a direct replacement for DG309DY? A: Yes. DG309DY+ maintains identical electrical specifications including 100Ohm on-state resistance, voltage supply ranges (5V ~ 30V single, ±5V ~ 20V dual), and switching characteristics. The primary differences are active product status and ROHS3 compliance. Packaging is Tube format; verify compatibility with your assembly process.

Q: What is the difference between DG309BDY-E3 and DG309DY-E3? A: Both parts are functionally equivalent with 85Ohm on-state resistance and identical electrical performance. The difference is packaging: DG309BDY-E3 is supplied in Tube format, while DG309DY-E3 is also supplied in Tube format. DG309BDY-T1-E3 and DG309DY-T1-E3 are Tape & Reel variants. Select based on your procurement and assembly requirements.

Q: Can I use DG271BDY-E3 if my application requires single supply voltage? A: DG271BDY-E3 does not specify single supply voltage capability; it is rated for dual supply only (±15V). If your application requires single supply operation, use DG309DY+, DG309BDY-E3, DG309BDY-T1-E3, DG309DY-E3, or DG309DY-T1-E3, which all support single supply ranges.

Q: What are the advantages of DG454EY-T1-E3 over the original DG309DY? A: DG454EY-T1-E3 offers significantly lower on-state resistance (5.3Ohm vs. 100Ohm), faster switching times (118ns/97ns vs. 250ns/150ns), extended operating temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C), and improved leakage current (500pA vs. 5nA). Trade-offs include narrower supply voltage ranges and higher charge injection (22pC vs. -10pC). Verify supply voltage compatibility before selection.

Q: Is ADG1311YRZ compatible with my 5V supply application? A: No. ADG1311YRZ is rated for 12V single supply and ±15V dual supply only. It does not support 5V operation. For 5V applications, use DG309DY+, DG309BDY-E3, DG309BDY-T1-E3, DG309DY-E3, or DG309DY-T1-E3.

Q: What packaging options are available for the 85Ohm resistance class substitutes? A: The 85Ohm class (DG309BDY and DG309DY variants) is available in three packaging formats: Tube (DG309BDY-E3, DG309DY-E3), Tape & Reel (DG309BDY-T1-E3, DG309DY-T1-E3), and Cut Tape & Digi-Reel (DG309DY-T1-E3). Select based on your assembly process and volume requirements.

Q: Are all substitute parts RoHS compliant? A: All active substitute parts listed carry ROHS3 compliance certification. The original DG309DY is RoHS non-compliant. If RoHS compliance is a requirement, select from the active substitutes.

Q: Can I mix different packaging formats of the same part in production? A: Yes, provided the electrical specifications are identical. For example, DG309BDY-E3 (Tube) and DG309BDY-T1-E3 (Tape & Reel) are electrically equivalent and can be used interchangeably. Verify your assembly equipment compatibility with each packaging format.

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