DG417DY-T1 SPST-NC Analog Switch IC – Equivalent & Substitute Parts

Part Overview

The DG417DY-T1 is a single-circuit SPST-NC (Single Pole Single Throw – Normally Closed) analog switch IC manufactured by Vishay Siliconix in 8-SOIC surface mount packaging. This interface component provides 35Ohm on-state resistance with dual supply voltage capability (±15V) and operates across the industrial temperature range of -40°C to 85°C. The part is currently classified as obsolete, making identification of active equivalent and substitute components essential for ongoing design support, production continuity, and new board revisions.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NC
Multiplexer/Demultiplexer Configuration	1:1
Number of Circuits	1
On-State Resistance (Max)	35Ohm
Voltage Supply – Single (V+)	12V
Voltage Supply – Dual (V±)	±15V
Switch Time Ton (Max)	175ns
Switch Time Toff (Max)	145ns
Charge Injection	60pC
Channel Capacitance CS(off) / CD(off)	8pF / 8pF
Current – Leakage IS(off) (Max)	250pA
Operating Temperature Range	-40°C to 85°C (TA)
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
RoHS Status	RoHS Non-Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the DG417DY-T1 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Switch circuit topology: SPST - NC
Multiplexer configuration: 1:1
Number of circuits: 1
On-state resistance: 35Ohm maximum
Dual supply voltage: ±15V capability
Package type: 8-SOIC surface mount
Leakage current: 250pA maximum
Operating temperature range: -40°C to 85°C minimum

Substitution Categories:

Direct Parametric Equivalent (Same Manufacturer, Active Status): DG417DY-T1-E3 – Identical electrical specifications with RoHS3 compliance and Tape & Reel packaging. Represents the active production equivalent.
Cross-Manufacturer Equivalents (Analog Devices): ADG417BRZ and ADG417BRZ-REEL – Meet all core electrical parameters with improved performance metrics (lower charge injection: 7pC vs. 60pC; reduced channel capacitance: 6pF vs. 8pF). Available in Tube and Cut Tape & Digi-Reel packaging.
Extended Operating Range Variants: DG417DY+ and MAX317ESA+ – Support the full -40°C to 85°C temperature range with enhanced electrical characteristics (lower charge injection: 3pC; improved channel-to-channel matching). DG417DY+ maintains Vishay lineage; MAX317ESA+ is Analog Devices/Maxim Integrated sourced.
Commercial Temperature Range Alternatives: DG417CY+, DG417CY+T, and MAX317CSA+ – Operate within 0°C to 70°C (commercial range), suitable for non-industrial applications. These offer superior charge injection (3pC) and crosstalk performance (-85dB @ 1MHz).

All substitute parts maintain electrical compatibility with the original DG417DY-T1 design while offering improved compliance status and performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Product Status	On-State Resistance (Max)	Voltage Supply (V±)	Switch Time Ton / Toff (Max)	Charge Injection	Channel Capacitance (pF)	Leakage Current (Max)	Operating Temp Range	Package	RoHS Status
DG417DY-T1	Vishay Siliconix	Obsolete	35Ohm	±15V	175ns / 145ns	60pC	8 / 8	250pA	-40°C to 85°C	8-SOIC Tube	Non-Compliant
DG417DY-T1-E3	Vishay Siliconix	Active	35Ohm	±15V	175ns / 145ns	60pC	8 / 8	250pA	-40°C to 85°C	8-SOIC TR	RoHS3 Compliant
ADG417BRZ	Analog Devices Inc.	Active	35Ohm	±15V	160ns / 100ns	7pC	6 / 6	250pA	-40°C to 85°C	8-SOIC Tube	RoHS3 Compliant
ADG417BRZ-REEL	Analog Devices Inc.	Active	35Ohm	±15V	160ns / 100ns	7pC	6 / 6	250pA	-40°C to 85°C	8-SOIC CT & Digi-Reel	RoHS3 Compliant
DG417CY+	Analog Devices Inc./Maxim Integrated	Active	35Ohm	±4.5V to ±20V	175ns / 145ns	3pC	8 / 8	250pA	0°C to 70°C	8-SOIC Tube	RoHS3 Compliant
DG417CY+T	Analog Devices Inc./Maxim Integrated	Active	35Ohm	±4.5V to ±20V	175ns / 145ns	3pC	8 / 8	250pA	0°C to 70°C	8-SOIC TR	RoHS3 Compliant
DG417DY+	Analog Devices Inc./Maxim Integrated	Active	35Ohm	±4.5V to ±20V	175ns / 145ns	3pC	8 / 8	250pA	-40°C to 85°C	8-SOIC Tube	RoHS3 Compliant
MAX317CSA+	Analog Devices Inc./Maxim Integrated	Active	35Ohm	±4.5V to ±20V	175ns / 145ns	3pC	8 / 8	250pA	0°C to 70°C	8-SOIC Tube	RoHS3 Compliant
MAX317ESA+	Analog Devices Inc./Maxim Integrated	Active	35Ohm	±4.5V to ±20V	175ns / 145ns	3pC	8 / 8	250pA	-40°C to 85°C	8-SOIC Tube	RoHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Obsolete to Active Transition): DG417DY-T1-E3 is the primary recommendation. It maintains identical electrical specifications and operating temperature range while achieving RoHS3 compliance. The transition from Tube to Tape & Reel packaging aligns with modern manufacturing standards.

For Industrial Temperature Range Applications (-40°C to 85°C): When full industrial temperature support is required, select from: ADG417BRZ, ADG417BRZ-REEL, DG417DY+, or MAX317ESA+. All maintain the -40°C to 85°C operating range with RoHS3 compliance. ADG417BRZ variants offer superior switching performance (160ns/100ns vs. 175ns/145ns) and reduced charge injection (7pC vs. 60pC), making them optimal for precision analog switching applications.

For Commercial Temperature Range Applications (0°C to 70°C): DG417CY+, DG417CY+T, and MAX317CSA+ are suitable for non-industrial environments. These parts deliver the lowest charge injection (3pC) and measurable crosstalk performance (-85dB @ 1MHz), beneficial for low-noise signal routing.

For Supply Voltage Flexibility: DG417CY+, DG417CY+T, DG417DY+, MAX317CSA+, and MAX317ESA+ support extended supply voltage ranges (±4.5V to ±20V), accommodating broader system designs compared to the original ±15V specification.

Compliance Consideration: All recommended substitutes are RoHS3 compliant, addressing regulatory requirements absent in the obsolete DG417DY-T1. Moisture sensitivity remains uniform (MSL 1 – Unlimited) across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can DG417DY-T1-E3 be used as a direct drop-in replacement for DG417DY-T1? A: Yes. DG417DY-T1-E3 is electrically and functionally identical to DG417DY-T1, with the primary difference being RoHS3 compliance and Tape & Reel packaging instead of Tube. PCB layout and schematic connections remain unchanged.

Q: What is the key difference between ADG417BRZ and DG417DY-T1? A: ADG417BRZ maintains all core electrical parameters (35Ohm on-state resistance, ±15V dual supply, 250pA leakage) but delivers improved performance: faster switching (160ns/100ns vs. 175ns/145ns), lower charge injection (7pC vs. 60pC), and reduced channel capacitance (6pF vs. 8pF). Both support -40°C to 85°C operation.

Q: Are DG417CY+ and DG417DY+ interchangeable? A: Not universally. Both are active parts with identical switching times and charge injection (3pC), but DG417CY+ operates only within 0°C to 70°C, while DG417DY+ supports -40°C to 85°C. Selection depends on application temperature requirements. Additionally, DG417CY+ has a narrower supply voltage range (±4.5V to ±20V) compared to the original ±15V specification, though this range is still compatible.

Q: What packaging options are available for industrial temperature range substitutes? A: ADG417BRZ is supplied in Tube packaging; ADG417BRZ-REEL is supplied in Cut Tape & Digi-Reel. DG417DY+ is available in Tube. DG417DY-T1-E3 is supplied in Tape & Reel. Selection should align with assembly line requirements and inventory management practices.

Q: Does the DG417DY-T1 require RoHS compliance for new designs? A: The original DG417DY-T1 is RoHS non-compliant. For new designs or production revisions subject to RoHS regulations, all recommended substitutes (DG417DY-T1-E3, ADG417BRZ, ADG417BRZ-REEL, DG417CY+, DG417CY+T, DG417DY+, MAX317CSA+, MAX317ESA+) are RoHS3 compliant.

Q: Can MAX317ESA+ replace DG417DY-T1 in existing designs? A: Yes, with verification. MAX317ESA+ matches the -40°C to 85°C operating range and all core electrical parameters. However, it is a different base product family (MAX317 vs. DG417), and design validation should confirm compatibility with existing board layouts and supply chain logistics.

Q: What is the significance of charge injection differences between parts? A: Charge injection (measured in picocoulombs) affects signal integrity in precision analog applications. The original DG417DY-T1 has 60pC charge injection, while ADG417BRZ offers 7pC and DG417CY+/DG417DY+/MAX317 variants offer 3pC. Lower charge injection reduces signal distortion and is preferred for audio, instrumentation, and data acquisition circuits.

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