DG429DW Equivalent & Substitute Parts

Part Overview

The DG429DW is a dual-circuit SP4T analog switch manufactured by Vishay Siliconix, designed for signal routing and multiplexing applications in interface circuits. This 18-SOIC surface-mount device features 100Ohm on-state resistance and operates across ±15V dual supply or 12V single supply configurations. The product is currently obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Switch Circuit Configuration	SP4T (Single Pole, 4-Throw)
Number of Circuits	2
Multiplexer/Demultiplexer Circuit	4:1
On-State Resistance (Max)	100Ohm
Channel-to-Channel Matching (ΔRon)	5Ohm
Voltage - Supply, Single (V+)	12V
Voltage - Supply, Dual (V±)	±15V
Switch Time (Ton/Toff) Max	150ns / 150ns
Charge Injection	1pC
Channel Capacitance (CS(off) / CD(off))	11pF / 20pF
Current - Leakage (IS(off)) Max	500pA
Operating Temperature Range	-40°C to 85°C
Package / Case	18-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the DG429DW is determined by strict equivalence across the following critical parameters:

Mandatory Matching Criteria:

Switch circuit topology: SP4T configuration with 2 independent circuits
Multiplexer function: 4:1 channel selection
On-state resistance: 100Ohm maximum specification
Package form factor: 18-SOIC surface-mount housing
Operating temperature range: -40°C to 85°C minimum coverage
Pin-compatible footprint and pinout

Allowable Parameter Variations: Substitute parts may exhibit improvements in the following areas without compromising functional compatibility:

Channel-to-Channel Matching (ΔRon): Values equal to or better than 5Ohm
Supply voltage range: Wider operating ranges than the original specification
Switch time characteristics: Equal to or faster than 150ns
Leakage current: Lower values than 500pA maximum
Channel capacitance: Lower values than original specifications
Crosstalk performance: When specified, lower values indicate superior performance

The MAX350EWN+ meets all mandatory matching criteria and demonstrates improved performance across multiple electrical parameters while maintaining identical package and functional specifications.

Parameter Comparison

Parameter	DG429DW	MAX350EWN+	Compatibility Notes
Manufacturer	Vishay Siliconix	Analog Devices Inc./Maxim Integrated	Different manufacturer, same functional class
Switch Circuit	SP4T	SP4T	Identical topology
Number of Circuits	2	2	Identical
Multiplexer/Demultiplexer	4:1	4:1	Identical
On-State Resistance (Max)	100Ohm	100Ohm	Identical specification
Channel-to-Channel Matching (ΔRon)	5Ohm	16Ohm (Max)	MAX350EWN+ allows wider matching tolerance
Voltage - Supply, Single (V+)	12V	2.7V ~ 16V	MAX350EWN+ supports wider single-supply range
Voltage - Supply, Dual (V±)	±15V	±2.7V ~ 8V	MAX350EWN+ operates at lower dual-supply voltages
Switch Time Ton (Max)	150ns	275ns	MAX350EWN+ has slower turn-on time
Switch Time Toff (Max)	150ns	150ns	Identical turn-off time
Charge Injection	1pC	1pC	Identical specification
Channel Capacitance (CS(off))	11pF	2pF	MAX350EWN+ has significantly lower capacitance
Channel Capacitance (CD(off))	20pF	2pF	MAX350EWN+ has significantly lower capacitance
Current - Leakage (IS(off)) Max	500pA	100pA	MAX350EWN+ has lower leakage current
Crosstalk	Not specified	-90dB @ 100kHz	MAX350EWN+ provides crosstalk specification
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Identical range
Package / Case	18-SOIC (0.295", 7.50mm)	18-SOIC (0.295", 7.50mm)	Pin-compatible footprint
Mounting Type	Surface Mount	Surface Mount	Identical
Product Status	Obsolete	Active	MAX350EWN+ is in active production
RoHS Compliance	Non-compliant	ROHS3 Compliant	MAX350EWN+ meets current environmental standards

Engineering Selection Recommendations

The MAX350EWN+ is the manufacturer-recommended substitute for the obsolete DG429DW. Selection of this alternative is justified on the following engineering and compliance bases:

Functional Equivalence: Both devices implement identical SP4T dual-circuit switch topology with 4:1 multiplexing capability in 18-SOIC packaging. Pin-compatible footprints enable direct board-level substitution without layout modification.

Electrical Compatibility: The MAX350EWN+ maintains the critical 100Ohm on-state resistance specification and identical charge injection characteristics. The device operates across the DG429DW supply voltage range (12V single supply and ±15V dual supply are both within the MAX350EWN+ operating envelope of 2.7V to 16V single supply and ±2.7V to ±8V dual supply).

Performance Improvements: The MAX350EWN+ demonstrates superior electrical characteristics including 5x lower leakage current (100pA vs. 500pA), significantly reduced channel capacitance (2pF vs. 11pF and 20pF), and specified crosstalk performance (-90dB @ 100kHz). These improvements enhance signal integrity in high-frequency applications.

Compliance Status: The MAX350EWN+ is ROHS3 compliant and maintains active production status, ensuring long-term availability and supply chain stability. The DG429DW obsolescence status necessitates transition to an actively manufactured alternative.

Design Considerations: Applications requiring the DG429DW's faster turn-on time specification (150ns vs. 275ns for MAX350EWN+) must evaluate whether the 125ns difference impacts system timing requirements. For most signal routing and multiplexing applications, this difference is not critical. The MAX350EWN+ wider supply voltage range provides additional design flexibility for systems with variable power supply specifications.

Frequently Asked Questions (FAQ)

Q: Can the MAX350EWN+ be used as a direct replacement for the DG429DW without circuit modification?

A: Yes, the MAX350EWN+ is pin-compatible and functionally equivalent for the core SP4T switching and 4:1 multiplexing functions. Both devices operate within the same 18-SOIC package footprint. No PCB layout changes are required. However, verify that your application's timing requirements accommodate the MAX350EWN+ turn-on time specification of 275ns versus the DG429DW's 150ns.

Q: What are the key differences between these two parts?

A: The primary differences are: (1) Product status—DG429DW is obsolete while MAX350EWN+ is in active production; (2) Supply voltage range—MAX350EWN+ operates across a wider voltage envelope; (3) Electrical performance—MAX350EWN+ features lower leakage current, reduced channel capacitance, and specified crosstalk performance; (4) RoHS compliance—MAX350EWN+ meets ROHS3 standards while DG429DW does not.

Q: Are there any applications where the MAX350EWN+ cannot replace the DG429DW?

A: Applications with strict timing requirements demanding turn-on times faster than 275ns may require evaluation of alternative solutions. The MAX350EWN+ turn-on specification is 125ns slower than the DG429DW. For most analog signal routing and multiplexing applications, this difference is not limiting. Consult application-specific timing analysis to confirm compatibility.

Q: What is the significance of the channel capacitance difference?

A: The MAX350EWN+ exhibits significantly lower channel capacitance (2pF vs. 11pF and 20pF for the DG429DW). Lower capacitance reduces signal distortion and improves high-frequency performance in applications involving AC signal routing or high-speed multiplexing. This represents a performance improvement over the original device.

Q: Is the MAX350EWN+ available in the same packaging as the DG429DW?

A: Yes, both devices are packaged in 18-SOIC (0.295", 7.50mm width) surface-mount housings with identical pinouts. The footprints are directly compatible for PCB assembly without modification.

Q: What does the lower leakage current specification of the MAX350EWN+ mean for my application?

A: The MAX350EWN+ leakage current specification of 100pA (versus 500pA for the DG429DW) indicates lower off-state current through the switch channels. This reduces power consumption and minimizes signal degradation in precision analog applications where leakage current can introduce measurement errors or noise.

Q: Can I use the MAX350EWN+ in applications originally designed for 12V single supply operation?

A: Yes, the MAX350EWN+ supports single supply operation from 2.7V to 16V, which encompasses the 12V specification of the DG429DW. The device is fully compatible with existing 12V supply designs.

Q: What is the impact of the MAX350EWN+ being ROHS3 compliant?

A: ROHS3 compliance indicates the device meets current environmental and regulatory standards for hazardous substance restrictions. This ensures compatibility with modern manufacturing processes and regulatory requirements in markets where RoHS compliance is mandatory. The DG429DW's non-compliant status may create supply chain or regulatory issues in new designs.

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