MAX327C/D Equivalent & Substitute Parts

Part Overview

The MAX327C/D is a 4-circuit IC switch with SPST-NO configuration and 4.6kOhm on-state resistance, designed for interface applications. This part is classified as obsolete, making substitute components necessary for new designs and ongoing production requirements. The MAX327C/D operates with single supply voltage (10V to 30V) or dual supply voltage (±5V to ±18V), providing low on-state resistance and minimal crosstalk performance suitable for precision switching applications.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NO
Number of Circuits	4
Multiplexer/Demultiplexer Circuit	1:1
On-State Resistance (Max)	4.6kOhm
Channel-to-Channel Matching (ΔRon)	175Ohm
Voltage - Supply, Single (V+)	10V ~ 30V
Voltage - Supply, Dual (V±)	±5V ~ 18V
Switch Time (Ton, Toff) (Max)	1µs, 500ns
Charge Injection	2pC
Channel Capacitance (CS(off), CD(off))	1.7pF, 1.7pF
Current - Leakage (IS(off)) (Max)	10pA
Crosstalk	-90dB @ 100kHz
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Base Product Number	MAX327
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MAX327C/D is determined by electrical and mechanical parameter equivalence within the MAX327 product family. The primary substitute, MAX327CSE+, maintains identical electrical specifications across all critical switching parameters: 4-circuit SPST-NO configuration, 4.6kOhm on-state resistance, 175Ohm channel-to-channel matching, dual and single supply voltage ranges, switching times, charge injection, channel capacitance, leakage current, and crosstalk performance.

The key substitution criteria are:

Switch circuit type: SPST - NO
Number of circuits: 4
On-state resistance: 4.6kOhm maximum
Channel-to-channel matching: 175Ohm
Supply voltage compatibility: 10V ~ 30V (single) and ±5V ~ 18V (dual)
Switching performance: 1µs/500ns maximum
Leakage and crosstalk specifications
Operating temperature range: 0°C ~ 70°C
RoHS3 compliance and MSL Level 1

The primary difference between MAX327C/D and MAX327CSE+ is packaging: the original part is supplied as a die, while the substitute is packaged in 16-SOIC form factor, making it suitable for standard PCB assembly processes.

Parameter Comparison

Parameter	MAX327C/D (Die)	MAX327CSE+ (16-SOIC)
Switch Circuit	SPST - NO	SPST - NO
Number of Circuits	4	4
Multiplexer/Demultiplexer Circuit	1:1	1:1
On-State Resistance (Max)	4.6kOhm	4.6kOhm
Channel-to-Channel Matching (ΔRon)	175Ohm (Typ)	175Ohm
Voltage - Supply, Single (V+)	10V ~ 30V	10V ~ 30V
Voltage - Supply, Dual (V±)	±5V ~ 18V	±5V ~ 18V
Switch Time (Ton, Toff) (Max)	1µs, 500ns	1µs, 500ns
Charge Injection	2pC	2pC
Channel Capacitance (CS(off), CD(off))	1.7pF, 1.7pF	1.7pF, 1.7pF
Current - Leakage (IS(off)) (Max)	10pA	10pA
Crosstalk	-90dB @ 100kHz	-90dB @ 100kHz
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C (TA)
Mounting Type	Surface Mount	Surface Mount
Package / Case	Die	16-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active

Engineering Selection Recommendations

The MAX327CSE+ is the direct substitute for the MAX327C/D based on electrical parameter equivalence and active product status. The MAX327C/D is obsolete, while MAX327CSE+ is actively manufactured and supported by Analog Devices Inc./Maxim Integrated.

Both parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard manufacturing and storage requirements. The MAX327CSE+ is packaged in 16-SOIC form factor, enabling integration into standard PCB assembly workflows, whereas the MAX327C/D die format requires specialized handling and assembly processes.

For new designs and production applications requiring the MAX327 4-circuit SPST-NO switch functionality, MAX327CSE+ is the appropriate selection due to its active status, standard packaging, and identical electrical performance specifications.

Frequently Asked Questions (FAQ)

Q: Can MAX327CSE+ directly replace MAX327C/D in existing designs?

A: Electrical substitution is complete; all switching parameters, supply voltage ranges, and performance specifications are identical. The primary difference is packaging: MAX327C/D is supplied as a die, while MAX327CSE+ is a 16-SOIC packaged component. PCB layout and assembly processes must accommodate the 16-SOIC form factor.

Q: Why is MAX327C/D classified as obsolete?

A: MAX327C/D is an obsolete product line. MAX327CSE+ represents the active equivalent within the MAX327 family and is the recommended component for current applications.

Q: Are there any compliance or certification differences between these parts?

A: Both parts are ROHS3 compliant and carry MSL Level 1 rating. MAX327CSE+ carries ECCN classification EAR99, while MAX327C/D is marked OBSOLETE. Both are REACH unaffected.

Q: What is the significance of the 16-SOIC package for MAX327CSE+?

A: The 16-SOIC (0.154", 3.90mm width) package enables standard surface mount assembly on PCBs. This contrasts with the die format of MAX327C/D, which requires specialized die-attach and wire-bonding processes.

Q: Are the switching performance characteristics identical?

A: Yes. Both parts specify identical switch times (1µs, 500ns maximum), charge injection (2pC), channel capacitance (1.7pF), leakage current (10pA maximum), and crosstalk (-90dB @ 100kHz).

Q: What supply voltage options are supported?

A: Both parts support single supply operation (10V to 30V) and dual supply operation (±5V to ±18V), providing flexibility for various circuit topologies.

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