MAX418CPD+ Equivalent & Substitute Parts Reference

Part Overview

The MAX418CPD+ is a general-purpose operational amplifier manufactured by Analog Devices Inc./Maxim Integrated, configured as a 4-circuit rail-to-rail amplifier in a 14-PDIP through-hole package. This device is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and production continuity. The MAX418CPD+ operates across a 2.5V to 10V supply range with extremely low input bias current (0.1 pA) and minimal input offset voltage (1 mV), making it suitable for precision low-power applications. Due to its obsolete status, equivalent active alternatives must be evaluated based on electrical performance parameters and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Output Type	Rail-to-Rail	—
Slew Rate	0.005	V/µs
Gain Bandwidth Product	8	kHz
Current - Input Bias	0.1	pA
Voltage - Input Offset	1	mV
Current - Supply (x4 Channels)	1	µA
Current - Output / Channel	600	µA
Voltage - Supply Span (Min)	2.5	V
Voltage - Supply Span (Max)	10	V
Operating Temperature	0 to 70	°C
Package / Case	14-DIP (0.300", 7.62mm)	—
Mounting Type	Through Hole	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the MAX418CPD+ is determined by strict adherence to the following electrical and mechanical parameters:

Primary Compatibility Criteria:

Package type: 14-DIP (0.300", 7.62mm) through-hole mounting
Number of circuits: 4 operational amplifiers per package
Output configuration: Rail-to-rail capability
Supply voltage range: Minimum 2.5V to maximum 10V overlap required
Operating temperature range: 0°C to 70°C minimum coverage

Secondary Electrical Parameters:

Input bias current: Must not exceed application requirements
Input offset voltage: Tolerance dependent on circuit precision needs
Output current per channel: Minimum 600 µA required for load driving capability
Slew rate and gain bandwidth product: Application-dependent performance metrics

The substitute parts are grouped into two functional categories based on amplifier architecture: CMOS amplifiers (ALD4701 and ALD4702 series) and voltage feedback amplifiers (AD8044ANZ). All substitute parts maintain the 14-PDIP package format and through-hole mounting compatibility. The ALD4701 series provides ultra-low input bias current (1 pA) with moderate bandwidth (1 MHz), suitable for precision applications. The ALD4702 series offers enhanced slew rate (2.8 V/µs) and higher output current (8 mA) with push-pull output configuration. The AD8044ANZ provides significantly higher bandwidth (160 MHz) and output current (30 mA) for applications requiring faster signal processing.

Parameter Comparison

Parameter	MAX418CPD+	AD8044ANZ	ALD4701APBL	ALD4702APBL	ALD4704APBL
Amplifier Type	General Purpose	Voltage Feedback	CMOS	CMOS	CMOS
Number of Circuits	4	4	4	4	4
Output Type	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Push-Pull, Rail-to-Rail	Push-Pull, Rail-to-Rail
Slew Rate (V/µs)	0.005	190	1	2.8	5
Gain Bandwidth Product	8 kHz	160 MHz	1 MHz	1.7 MHz	2.1 MHz
Current - Input Bias	0.1 pA	2 µA	1 pA	1 pA	1 pA
Voltage - Input Offset	1 mV	1.4 mV	2 mV	1 mV	1 mV
Current - Supply	1 µA (x4)	11.5 mA	490 µA	4 mA	10 mA
Current - Output / Channel	600 µA	30 mA	1 mA	8 mA	15 mA
Voltage - Supply Span (Min)	2.5 V	3 V	2 V	4 V	6.5 V
Voltage - Supply Span (Max)	10 V	12 V	10 V	10 V	12 V
Operating Temperature	0 to 70°C	-40 to 85°C	0 to 70°C	0 to 70°C	0 to 70°C
Package / Case	14-DIP	14-DIP	14-DIP	14-DIP	14-DIP
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement in Low-Bandwidth Applications:

The ALD4701 series (ALD4701APBL, ALD4701BPBL, ALD4701PBL) provides the closest functional match to the MAX418CPD+ for applications requiring ultra-low input bias current and minimal power consumption. These CMOS amplifiers maintain the 1 pA input bias current specification, operate within the 2V to 10V supply range, and preserve the 14-DIP package format. All variants are active products with ROHS3 compliance. Selection among ALD4701 variants depends on input offset voltage tolerance requirements: ALD4701APBL (2 mV), ALD4701BPBL (5 mV), or ALD4701PBL (10 mV).

For Applications Requiring Enhanced Output Current:

The ALD4702 series (ALD4702APBL, ALD4702BPBL, ALD4702PBL) offers increased output current capability (8 mA per channel versus 1 mA) and improved slew rate (2.8 V/µs versus 1 V/µs) while maintaining 1 pA input bias current. These devices feature push-pull output configuration and require minimum 4V supply voltage. Suitable for applications where the MAX418CPD+ output current (600 µA) is insufficient.

For High-Speed Signal Processing:

The AD8044ANZ provides significantly enhanced performance with 160 MHz bandwidth and 30 mA output current per channel. This voltage feedback amplifier is suitable for applications where the MAX418CPD+'s 8 kHz bandwidth is limiting. The AD8044ANZ requires minimum 3V supply and operates to -40°C to 85°C temperature range. Input bias current increases to 2 µA, which may require circuit redesign in precision applications.

For Maximum Output Current and Slew Rate:

The ALD4704 series (ALD4704APBL, ALD4704BPBL, ALD4704PBL) delivers the highest performance among CMOS alternatives with 5 V/µs slew rate, 2.1 MHz bandwidth, and 15 mA output current per channel. These devices require minimum 6.5V supply voltage and are suitable for applications demanding both precision (1 pA input bias) and performance.

Compliance and Availability:

All substitute parts are active products with ROHS3 compliance and REACH unaffected status, matching the MAX418CPD+ regulatory classification. Inventory availability ranges from 671 to 2100 pieces across substitute options, ensuring production continuity.

Frequently Asked Questions (FAQ)

Q: Can the ALD4701 series directly replace the MAX418CPD+ in existing PCB designs?

A: Yes, the ALD4701 series maintains mechanical and electrical compatibility within the specified parameters. The 14-DIP package footprint is identical, and the 2V to 10V supply range encompasses the MAX418CPD+ operating range. However, verify that the application does not depend on the MAX418CPD+'s specific slew rate (0.005 V/µs) or gain bandwidth product (8 kHz), as ALD4701 provides 1 V/µs slew rate and 1 MHz bandwidth. Input offset voltage tolerance differences (ALD4701 minimum 2 mV versus MAX418CPD+ 1 mV) must be evaluated for precision circuits.

Q: What is the primary difference between ALD4702 and ALD4704 series?

A: Both series feature push-pull, rail-to-rail output configuration and 1 pA input bias current. The ALD4704 series provides superior performance: 5 V/µs slew rate (versus 2.8 V/µs), 2.1 MHz bandwidth (versus 1.5-1.7 MHz), and 15 mA output current per channel (versus 8 mA). The ALD4704 requires minimum 6.5V supply voltage, while ALD4702 operates from 4V minimum. Select ALD4704 for applications requiring maximum speed and output current; select ALD4702 for lower supply voltage operation.

Q: Is the AD8044ANZ suitable for precision low-bias-current applications?

A: The AD8044ANZ is not optimal for ultra-precision applications requiring minimal input bias current. Its 2 µA input bias current is 20,000 times higher than the MAX418CPD+ (0.1 pA) and 2,000 times higher than the ALD4701 series (1 pA). The AD8044ANZ is designed for high-speed, high-current applications where bandwidth and output drive capability are primary requirements. Use AD8044ANZ only when application bandwidth requirements exceed 1 MHz and input bias current is not a limiting factor.

Q: Can I use ALD4702APBL in a circuit designed for ALD4701APBL?

A: Mechanical compatibility is confirmed (both 14-DIP package), but electrical differences require evaluation. ALD4702APBL provides higher slew rate (2.8 V/µs versus 1 V/µs), higher output current (8 mA versus 1 mA), and higher gain bandwidth product (1.7 MHz versus 1 MHz). Both maintain 1 pA input bias current and 1 mV input offset voltage. The primary constraint is minimum supply voltage: ALD4702 requires 4V minimum versus ALD4701's 2V minimum. If the circuit operates above 4V, ALD4702APBL is a direct upgrade providing enhanced performance.

Q: What are the input offset voltage tolerance options among substitute parts?

A: The ALD4701 and ALD4702 series offer three input offset voltage grades: A-grade (1-2 mV), B-grade (2-5 mV), and standard grade (5-10 mV). The MAX418CPD+ specifies 1 mV maximum. For direct replacement in precision applications, select ALD4702APBL (1 mV) or ALD4701APBL (2 mV). The ALD4704 series provides ALD4704APBL (1 mV), ALD4704BPBL (2 mV), and ALD4704PBL (5 mV) options. The AD8044ANZ specifies 1.4 mV input offset voltage.

Q: Are all substitute parts available in the same packaging format?

A: Yes, all substitute parts are supplied in 14-PDIP (0.300", 7.62mm) through-hole package format, identical to the MAX418CPD+. Packaging is specified as Tube for all substitute options. Mounting type is through-hole for all devices, ensuring PCB compatibility without modification.

Q: What is the impact of supply voltage range differences on substitution?

A: The MAX418CPD+ operates from 2.5V to 10V. Substitute parts have varying minimum supply requirements: ALD4701 (2V minimum), AD8044ANZ (3V minimum), ALD4702 (4V minimum), and ALD4704 (6.5V minimum). If the application operates at 2.5V, only ALD4701 is compatible. If operation is at 4V or higher, ALD4702 and AD8044ANZ become available. If operation is at 6.5V or higher, ALD4704 is also suitable. Verify the actual circuit supply voltage before selecting a substitute.

Q: How do I determine which substitute part is appropriate for my application?

A: Prioritize selection based on these criteria in order: (1) Required supply voltage range—select parts with compatible minimum voltage; (2) Input bias current requirement—if ultra-low bias is critical, select ALD4701 or ALD4702 series; (3) Bandwidth and slew rate—if high-speed operation is required, select ALD4704 or AD8044ANZ; (4) Output current requirement—if load current exceeds 1 mA, select ALD4702 or ALD4704; (5) Input offset voltage tolerance—select appropriate grade (A, B, or standard) based on precision requirements.

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