MAX4530CPP+ Equivalent & Substitute Parts

Part Overview

The MAX4530CPP+ is an 8:1 analog multiplexer/demultiplexer IC manufactured by Analog Devices Inc./Maxim Integrated, housed in a 20-pin DIP package. This component features a 75Ohm on-state resistance and operates across single supply (2V to 12V) or dual supply (±2V to 6V) configurations. The product is currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs requiring similar switching capabilities.

Key Parameters

Parameter	Value
Multiplexer/Demultiplexer Circuit	8:1
Number of Circuits	1
On-State Resistance (Max)	75Ohm
Channel-to-Channel Matching (ΔRon)	1Ohm
Voltage - Supply, Single (V+)	2V ~ 12V
Voltage - Supply, Dual (V±)	±2V ~ 6V
Switch Time (Ton, Toff) (Max)	150ns, 100ns
Charge Injection	1.5pC
Channel Capacitance (CS(off), CD(off))	3pF, 15pF
Current - Leakage (IS(off)) (Max)	1nA
Crosstalk	-92dB @ 1MHz
Operating Temperature	0°C ~ 70°C
Package / Case	20-DIP (0.300", 7.62mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the MAX4530CPP+ is determined by the following critical parameters:

Multiplexer Configuration: 8:1 topology (mandatory match)
Package Type: 20-DIP form factor (mandatory match for direct replacement)
On-State Resistance: Maximum 75Ohm specification
Supply Voltage Compatibility: Single supply 2V–12V or dual supply ±2V–6V operation
Switching Performance: Switch time and charge injection characteristics
Leakage Current: Maximum 1nA specification
Environmental Compliance: RoHS3 compliance preferred for new designs

The identified substitute parts CD74HC4351E and CD74HCT4351E maintain the 8:1 multiplexer configuration and 20-DIP package. However, both substitutes feature higher on-state resistance (130Ohm maximum) and different supply voltage ranges, requiring circuit-level evaluation for compatibility.

Parameter Comparison

Parameter	MAX4530CPP+	CD74HC4351E	CD74HCT4351E
Manufacturer	Analog Devices Inc./Maxim Integrated	Texas Instruments	Harris Corporation
Multiplexer/Demultiplexer Circuit	8:1	8:1	8:1
On-State Resistance (Max)	75Ohm	130Ohm	130Ohm
Channel-to-Channel Matching (ΔRon)	1Ohm	5Ohm	5Ohm
Voltage - Supply, Single (V+)	2V ~ 12V	2V ~ 6V	4.5V ~ 5.5V
Voltage - Supply, Dual (V±)	±2V ~ 6V	±1V ~ 5V	±1V ~ 5V
Switch Time (Ton, Toff) (Max)	150ns, 100ns	55ns, 50ns	60ns, 55ns
Charge Injection	1.5pC	Not specified	Not specified
Channel Capacitance (CS(off), CD(off))	3pF, 15pF	5pF, 25pF	5pF, 25pF
Current - Leakage (IS(off)) (Max)	1nA	200nA	400nA
Operating Temperature	0°C ~ 70°C	-55°C ~ 125°C	-55°C ~ 125°C
Package / Case	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)
Product Status	Obsolete	Last Time Buy	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

CD74HC4351E (Texas Instruments)

This part maintains ROHS3 compliance and offers an extended operating temperature range (-55°C to 125°C) compared to the MAX4530CPP+. The CD74HC4351E is suitable for applications where the higher on-state resistance (130Ohm vs. 75Ohm) and increased leakage current (200nA vs. 1nA) are acceptable. The single supply voltage range is limited to 2V–6V, which may restrict use in systems requiring operation above 6V. This part is in Last Time Buy status, indicating limited future availability.

CD74HCT4351E (Harris Corporation)

This substitute provides the widest operating temperature range (-55°C to 125°C) but is restricted to a narrow single supply voltage window (4.5V–5.5V), making it suitable only for standard 5V logic systems. The part is RoHS non-compliant and obsolete, presenting compliance and availability concerns for new designs. Leakage current is the highest among the three options (400nA), and the part should be selected only when 5V-only operation is required and RoHS compliance is not mandated.

Frequently Asked Questions (FAQ)

Q: Can CD74HC4351E or CD74HCT4351E directly replace MAX4530CPP+ in existing designs?

A: Direct replacement requires circuit-level evaluation. Both substitutes maintain the 8:1 multiplexer configuration and 20-DIP package, but differ significantly in on-state resistance (130Ohm vs. 75Ohm), leakage current, and supply voltage ranges. Applications sensitive to signal attenuation or operating outside the 2V–6V range may require design modifications.

Q: What are the key differences in supply voltage compatibility?

A: The MAX4530CPP+ operates from 2V–12V (single supply) or ±2V–6V (dual supply). The CD74HC4351E supports 2V–6V (single) or ±1V–5V (dual). The CD74HCT4351E is restricted to 4.5V–5.5V (single) or ±1V–5V (dual). Systems requiring operation above 6V single supply cannot use either substitute without redesign.

Q: How does the increased on-state resistance affect circuit performance?

A: The substitutes feature 130Ohm on-state resistance compared to the MAX4530CPP+'s 75Ohm specification. This 73% increase in resistance will increase signal attenuation and voltage drop across the switch. Applications with low-impedance signal sources or tight signal integrity requirements must verify compatibility through simulation or testing.

Q: Are there compliance or availability concerns with these substitutes?

A: The CD74HC4351E is ROHS3 compliant but in Last Time Buy status. The CD74HCT4351E is RoHS non-compliant and obsolete. For new designs requiring long-term component availability and regulatory compliance, the CD74HC4351E is the preferred option, though neither part offers the same availability profile as current-generation multiplexer ICs.

Q: What is the significance of the higher leakage current in the substitutes?

A: The MAX4530CPP+ specifies 1nA maximum leakage, while CD74HC4351E and CD74HCT4351E specify 200nA and 400nA respectively. This 200–400× increase in leakage current may impact applications requiring extremely low off-channel current, such as precision analog signal routing or high-impedance measurement circuits.

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