MAX325C/D Equivalent & Substitute Parts

Part Overview

The MAX325C/D is a 2-circuit IC switch with SPST (Single Pole Single Throw) NO/NC configuration and 60Ohm on-state resistance, designed for interface applications. This part is classified as obsolete, making identification of active equivalent components essential for new designs and ongoing production support. The die package format limits direct board-level integration, necessitating evaluation of packaged alternatives that maintain electrical and functional compatibility.

Key Parameters

Parameter	Value
Switch Circuit Configuration	SPST - NO/NC
Number of Circuits	2
Multiplexer/Demultiplexer Circuit	1:1
On-State Resistance (Max)	60Ohm
Channel-to-Channel Matching (ΔRon)	800mOhm (Typ)
Voltage - Supply, Single (V+)	2.7V ~ 16V
Switch Time (Ton, Toff) (Max)	150ns, 100ns
Charge Injection	1pC
Channel Capacitance (CS(off), CD(off))	9pF, 9pF
Current - Leakage (IS(off)) (Max)	100pA
Crosstalk	-85dB @ 1MHz
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MAX325C/D is determined by strict equivalence across the following electrical and mechanical parameters:

Switch topology: SPST - NO/NC configuration with 2 circuits at 1:1 multiplexing ratio
On-state resistance: Maximum 60Ohm specification
Channel matching: 800mOhm typical ΔRon tolerance
Supply voltage range: 2.7V to 16V single supply operation
Switching performance: 150ns maximum turn-on time, 100ns maximum turn-off time
Signal integrity: 1pC charge injection, 9pF channel capacitance, -85dB crosstalk @ 1MHz
Leakage current: 100pA maximum IS(off)
Compliance: ROHS3 and MSL Level 1 certification

The MAX325ESA+ qualifies as a direct substitute based on identical electrical specifications across all parameters listed above. The primary distinction is packaging format: the MAX325C/D is supplied as a die, while the MAX325ESA+ is packaged in 8-SOIC surface-mount format, enabling direct board-level integration.

Parameter Comparison

Parameter	MAX325C/D (Main Part)	MAX325ESA+ (Substitute)
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Product Status	Obsolete	Active
Switch Circuit	SPST - NO/NC	SPST - NO/NC
Number of Circuits	2	2
Multiplexer/Demultiplexer Circuit	1:1	1:1
On-State Resistance (Max)	60Ohm	60Ohm
Channel-to-Channel Matching (ΔRon)	800mOhm (Typ)	800mOhm
Voltage - Supply, Single (V+)	2.7V ~ 16V	2.7V ~ 16V
Switch Time (Ton, Toff) (Max)	150ns, 100ns	150ns, 100ns
Charge Injection	1pC	1pC
Channel Capacitance (CS(off), CD(off))	9pF, 9pF	9pF, 9pF
Current - Leakage (IS(off)) (Max)	100pA	100pA
Crosstalk	-85dB @ 1MHz	-85dB @ 1MHz
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
Package / Case	Die	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount

Engineering Selection Recommendations

The MAX325ESA+ is the active equivalent for the obsolete MAX325C/D. Both components maintain identical electrical specifications and compliance certifications (ROHS3, MSL Level 1). Selection between these parts is determined by application requirements:

MAX325C/D (Die format): Suitable for hybrid circuit integration, multi-chip module assembly, or custom packaging applications where die-level integration is specified.

MAX325ESA+ (8-SOIC package): Recommended for standard PCB assembly workflows. The packaged format enables direct surface-mount placement, automated testing, and standard supply chain handling. Active product status ensures long-term availability and manufacturing support.

For new designs and production transitions from obsolete inventory, the MAX325ESA+ provides equivalent electrical performance with the operational advantages of an active product line.

Frequently Asked Questions (FAQ)

Q: Can MAX325ESA+ directly replace MAX325C/D in existing designs?

A: Electrical substitution is complete across all specified parameters. However, packaging differs: MAX325C/D is a die requiring hybrid assembly, while MAX325ESA+ is an 8-SOIC surface-mount package. Board-level integration requires design modification to accommodate the packaged format.

Q: What are the key parameters that define substitution eligibility?

A: Substitution requires matching: SPST - NO/NC switch topology, 2-circuit configuration, 60Ohm on-state resistance, 2.7V–16V supply range, 150ns/100ns switching times, 1pC charge injection, 9pF channel capacitance, 100pA leakage current, and -85dB crosstalk @ 1MHz.

Q: Are there compliance differences between MAX325C/D and MAX325ESA+?

A: Both components are ROHS3 compliant with MSL Level 1 rating. The MAX325ESA+ carries ECCN classification EAR99, while the MAX325C/D is marked obsolete. For new production, the MAX325ESA+ provides current regulatory support.

Q: What is the operating temperature range difference?

A: MAX325C/D operates 0°C to 70°C. MAX325ESA+ extends to -40°C to 85°C (TA). Applications requiring extended temperature performance benefit from the MAX325ESA+ specification.

Q: Is the 8-SOIC package compatible with standard PCB assembly equipment?

A: Yes. The 8-SOIC (0.154", 3.90mm width) package is a standard surface-mount format compatible with conventional pick-and-place and reflow soldering processes.

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