DG405C/D Equivalent & Substitute Parts

Part Overview

The DG405C/D is a 2-circuit IC switch manufactured by Analog Devices Inc./Maxim Integrated, configured as a DPST-NO (Double Pole Single Throw - Normally Open) multiplexer with 2:1 switching capability. This die-form component features 45Ohm on-state resistance and operates across single supply (10V ~ 30V) or dual supply (±4.5V ~ 20V) configurations. The product is classified as obsolete, making equivalent substitutes necessary for new designs and production continuity.

Key Parameters

Parameter	Value
Switch Circuit Configuration	DPST - NO
Multiplexer/Demultiplexer Circuit	2:1
Number of Circuits	2
On-State Resistance (Max)	45Ohm
Channel-to-Channel Matching (ΔRon)	500mOhm (Typ)
Voltage - Supply, Single (V+)	10V ~ 30V
Voltage - Supply, Dual (V±)	±4.5V ~ 20V
Switch Time (Ton, Toff) (Max)	150ns, 100ns
Charge Injection	10pC
Channel Capacitance (CS(off), CD(off))	12pF, 12pF
Current - Leakage (IS(off)) (Max)	500pA
Crosstalk	-90dB @ 1MHz
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	Die
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the DG405C/D is determined by the following critical parameters:

Switch Circuit Type: DPST configuration for dual-channel switching
Multiplexer Ratio: 2:1 switching capability
On-State Resistance: Maximum 45Ohm specification
Supply Voltage Compatibility: Single or dual supply operation within specified ranges
Operating Temperature Range: 0°C ~ 70°C
Compliance Standards: ROHS3 compliance and MSL rating

The MAX4589CAP+ qualifies as a functional substitute based on matching switch circuit topology (DPST), 2:1 multiplexer configuration, 2-channel architecture, and compatible operating temperature range. Both components maintain ROHS3 compliance and MSL-1 ratings. The substitute operates across overlapping supply voltage ranges and provides enhanced performance characteristics suitable for modern applications.

Parameter Comparison

Parameter	DG405C/D	MAX4589CAP+
Switch Circuit	DPST - NO	DPST
Multiplexer/Demultiplexer Circuit	2:1	2:1
Number of Channels	2	2
On-State Resistance (Max)	45Ohm	60Ohm
Voltage - Supply, Single (V+)	10V ~ 30V	2.7V ~ 12V
Voltage - Supply, Dual (V±)	±4.5V ~ 20V	±2.7V ~ 6V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	Die	20-SSOP (0.209", 5.30mm Width)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active

Engineering Selection Recommendations

The MAX4589CAP+ is the manufacturer-recommended substitute for the obsolete DG405C/D. Both components are manufactured by Analog Devices Inc./Maxim Integrated and maintain identical compliance certifications (ROHS3, MSL-1). The substitute is currently in active production status, ensuring long-term availability and supply chain continuity.

Key considerations for selection:

The MAX4589CAP+ operates at reduced supply voltage ranges (2.7V ~ 12V single supply versus 10V ~ 30V for the original), requiring verification of application voltage requirements.
On-state resistance increases from 45Ohm to 60Ohm maximum, which may impact signal integrity in low-impedance applications.
The substitute transitions from die form to 20-SSOP package, requiring PCB layout and assembly process modifications.
The MAX4589CAP+ provides enhanced bandwidth performance (200MHz) and includes Break-Before-Make and SPI configuration features not specified in the original component.

Frequently Asked Questions (FAQ)

Q: Can the MAX4589CAP+ directly replace the DG405C/D in existing designs?

A: Direct replacement requires verification of three critical parameters: supply voltage compatibility, on-state resistance tolerance, and package form factor. The substitute operates at lower maximum supply voltages and higher on-state resistance. The transition from die to 20-SSOP package necessitates PCB redesign.

Q: What are the key differences in electrical performance?

A: The MAX4589CAP+ specifies 60Ohm maximum on-state resistance compared to 45Ohm for the DG405C/D. Supply voltage ranges differ significantly: the substitute supports 2.7V ~ 12V single supply and ±2.7V ~ 6V dual supply, versus 10V ~ 30V and ±4.5V ~ 20V for the original. Both maintain identical operating temperature ranges and compliance ratings.

Q: Are there package considerations for substitution?

A: Yes. The DG405C/D is supplied as a die component, while the MAX4589CAP+ is packaged in 20-SSOP form factor. This requires complete PCB layout revision, assembly process changes, and testing validation for the new package configuration.

Q: Does the substitute provide equivalent crosstalk performance?

A: Crosstalk specifications are not provided for the MAX4589CAP+ in the available data. Verification against application requirements is necessary before final component selection.

Q: What compliance certifications apply to both components?

A: Both the DG405C/D and MAX4589CAP+ are ROHS3 compliant with MSL-1 (Unlimited) moisture sensitivity ratings, ensuring equivalent environmental and regulatory compliance for production applications.

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