MAX418CPD Equivalent & Substitute Parts Reference

Part Overview

The MAX418CPD is a general-purpose operational amplifier featuring four circuits in a 14-PDIP through-hole package, manufactured by Analog Devices Inc./Maxim Integrated. This device is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and legacy system maintenance. The MAX418CPD operates across a 2.5V to 10V supply range with rail-to-rail output capability, making it suitable for low-power analog signal processing applications. Due to its obsolete status and limited availability in future procurement cycles, active substitute parts with compatible electrical and mechanical characteristics are essential for design continuity.

Key Parameters

Parameter	Value	Unit
Manufacturer Part Number	MAX418CPD	—
Manufacturer	Analog Devices Inc./Maxim Integrated	—
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	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the MAX418CPD is determined by the following critical parameters: four-circuit configuration, rail-to-rail output capability, 14-PDIP through-hole package format, and supply voltage range compatibility. The substitute parts are grouped into two functional categories based on amplifier architecture and performance characteristics:

Category 1: Voltage Feedback Amplifiers The AD8044ANZ operates as a voltage feedback amplifier with significantly enhanced performance specifications. This part maintains the four-circuit, rail-to-rail, 14-PDIP configuration but operates within a 3V to 12V supply range, which overlaps the MAX418CPD range above 3V. The AD8044ANZ is active and RoHS3 compliant, addressing obsolescence and environmental compliance concerns.

Category 2: CMOS Amplifiers The ALD4701 series (ALD4701APBL, ALD4701BPBL, ALD4701PBL) and ALD4702 series (ALD4702APBL, ALD4702BPBL, ALD4702PBL) represent CMOS-based alternatives manufactured by Advanced Linear Devices Inc. These parts maintain four-circuit configuration, rail-to-rail output, and 14-PDIP through-hole packaging. The ALD4701 series operates within 2V to 10V supply range, fully encompassing the MAX418CPD range. The ALD4702 series operates within 4V to 10V supply range, compatible with the upper portion of the MAX418CPD range. All ALD parts are active and RoHS3 compliant.

Category 3: Enhanced Performance CMOS Amplifiers The ALD4704 series (ALD4704APBL, ALD4704BPBL, ALD4704PBL) provides push-pull, rail-to-rail output with enhanced slew rate and bandwidth. These parts operate within 6.5V to 12V supply range, compatible with the upper portion of the MAX418CPD range. All ALD4704 variants are active and RoHS3 compliant.

Substitution compatibility is established through matching package format (14-PDIP), circuit count (4), output type (rail-to-rail), and overlapping supply voltage ranges.

Parameter Comparison

Parameter	MAX418CPD	AD8044ANZ	ALD4701APBL	ALD4702APBL	ALD4704APBL
Manufacturer	Analog Devices/Maxim	Analog Devices	Advanced Linear Devices	Advanced Linear Devices	Advanced Linear Devices
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 (mV)	1	1.4	2	1	1
Current - Supply (mA)	0.001	11.5	0.49	4	10
Current - Output / Channel (mA)	0.6	30	1	8	15
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 (0.300")	14-DIP (0.300")	14-DIP (0.300")	14-DIP (0.300")	14-DIP (0.300")
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement in Low-Frequency Applications (Supply ≥ 3V)

The AD8044ANZ serves as the primary substitute when supply voltage is 3V or higher. This part is manufactured by Analog Devices Inc., the original MAX418CPD designer, ensuring design continuity. The AD8044ANZ is active with RoHS3 compliance, addressing both obsolescence and environmental regulatory requirements. Extended operating temperature range (-40°C to 85°C) provides broader application flexibility compared to the MAX418CPD (0°C to 70°C).

For Applications Requiring Extended Supply Range (2V to 10V)

The ALD4701 series (ALD4701APBL, ALD4701BPBL, ALD4701PBL) maintains full supply voltage compatibility with the MAX418CPD across the entire 2V to 10V range. These CMOS amplifiers are active, RoHS3 compliant, and available in multiple offset voltage grades. 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 (Supply 4V to 10V)

The ALD4702 series (ALD4702APBL, ALD4702BPBL, ALD4702PBL) provides push-pull output with 8 mA per-channel capability, compared to 1 mA for ALD4701 series. These parts operate within 4V to 10V supply range and are active, RoHS3 compliant. Selection among variants depends on input offset voltage tolerance: ALD4702APBL (1 mV), ALD4702BPBL (2 mV), or ALD4702PBL (5 mV).

For Applications Requiring Maximum Performance (Supply 6.5V to 12V)

The ALD4704 series (ALD4704APBL, ALD4704BPBL, ALD4704PBL) delivers the highest slew rate (5V/µs) and output current (15 mA per-channel) among substitute options. These parts operate within 6.5V to 12V supply range and are active, RoHS3 compliant. Selection among variants depends on input offset voltage tolerance: ALD4704APBL (1 mV), ALD4704BPBL (2 mV), or ALD4704PBL (5 mV).

All substitute parts maintain through-hole 14-PDIP package format, ensuring mechanical compatibility with existing PCB layouts designed for the MAX418CPD.

Frequently Asked Questions (FAQ)

Q1: Can the AD8044ANZ replace the MAX418CPD in all applications?

The AD8044ANZ is compatible with MAX418CPD applications where supply voltage is 3V or higher. The MAX418CPD operates down to 2.5V; the AD8044ANZ minimum is 3V. For applications requiring 2.5V to 3V operation, the ALD4701 series is required.

Q2: What is the primary difference between ALD4701 and ALD4702 series?

The ALD4701 series provides 1 mA per-channel output current with standard slew rate (1V/µs). The ALD4702 series provides 8 mA per-channel output current with enhanced slew rate (2.8V/µs). Selection depends on output current requirements of the application.

Q3: Why are there multiple part numbers within the ALD4701 and ALD4702 series?

Multiple part numbers within each series differ only in input offset voltage specification. ALD4701APBL specifies 2 mV, ALD4701BPBL specifies 5 mV, and ALD4701PBL specifies 10 mV. Selection depends on input offset voltage tolerance requirements of the application circuit.

Q4: Are all substitute parts RoHS compliant?

All substitute parts listed (AD8044ANZ, ALD4701 series, ALD4702 series, ALD4704 series) are RoHS3 compliant. The original MAX418CPD is RoHS non-compliant. Substitution addresses environmental regulatory compliance requirements.

Q5: What is the package compatibility between MAX418CPD and substitute parts?

All substitute parts use 14-DIP (0.300", 7.62mm) through-hole package format, identical to the MAX418CPD. Direct PCB layout compatibility is maintained without modification.

Q6: Can the ALD4704 series replace the MAX418CPD in 2.5V supply applications?

No. The ALD4704 series minimum supply voltage is 6.5V. For 2.5V to 10V supply range applications, the ALD4701 series is required.

Q7: What is the inventory status of substitute parts?

Current inventory: AD8044ANZ (2100 pcs), ALD4701APBL (944 pcs), ALD4701BPBL (unavailable in provided data), ALD4701PBL (1072 pcs), ALD4702APBL (1000 pcs), ALD4702BPBL (671 pcs), ALD4702PBL (778 pcs), ALD4704APBL (1077 pcs), ALD4704BPBL (773 pcs), ALD4704PBL (1064 pcs). All parts are listed as new original stock.

Q8: How does the operating temperature range affect substitution selection?

The MAX418CPD operates 0°C to 70°C. The AD8044ANZ extends to -40°C to 85°C. The ALD series (ALD4701, ALD4702, ALD4704) operate 0°C to 70°C, matching the MAX418CPD range. For applications requiring extended temperature operation below 0°C or above 70°C, only the AD8044ANZ qualifies.

Q9: What is the significance of push-pull output in ALD4702 and ALD4704 series?

Push-pull output configuration provides higher output current capability and improved slew rate compared to standard rail-to-rail output. ALD4702 and ALD4704 series deliver 8 mA and 15 mA per-channel respectively, compared to 1 mA for ALD4701 series. Selection depends on load current requirements.

Q10: Are there any supply voltage gaps between substitute part ranges?

Yes. The ALD4702 series operates 4V to 10V, creating a gap between 2V and 4V. For applications requiring 2V to 4V operation, only the ALD4701 series is suitable. For applications requiring 4V to 10V operation, ALD4701, ALD4702, or AD8044ANZ (3V to 12V) are all compatible.

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