MAX4478ASD Equivalent & Substitute Parts Reference

Part Overview

The MAX4478ASD is a general-purpose operational amplifier manufactured by Analog Devices Inc./Maxim Integrated, featuring four independent circuits in a 14-SOIC surface-mount package. This device is classified as Obsolete and is no longer in active production. The MAX4478ASD delivers push-pull, rail-to-rail output capability with a slew rate of 3V/µs and a gain bandwidth product of 10 MHz, making it suitable for general-purpose amplification applications requiring moderate bandwidth and rail-to-rail output swing.

Due to its obsolete status, identifying functionally equivalent substitute parts is essential for design continuity, production support, and long-term component availability. Substitute parts must maintain compatibility across key electrical parameters including supply voltage range, output type, circuit count, and package form factor.

Key Parameters

Parameter	MAX4478ASD Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	Circuits
Output Type	Push-Pull, Rail-to-Rail	—
Slew Rate	3	V/µs
Gain Bandwidth Product	10	MHz
Current - Input Bias	1	pA
Voltage - Input Offset	70	µV
Current - Supply (per 4 Channels)	2.5	mA
Current - Output / Channel	48	mA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	5.5	V
Operating Temperature Range	-40 to 125	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the MAX4478ASD are grouped based on strict adherence to the following critical parameters:

Primary Substitution Criteria:

Number of Circuits: Must be 4 independent amplifier circuits
Package / Case: Must be 14-SOIC (0.154", 3.90mm Width) for mechanical and electrical compatibility
Mounting Type: Must be Surface Mount
Output Type: Must support Rail-to-Rail output capability
Supply Voltage Range: Must encompass or match the 2.7V to 5.5V span
Operating Temperature: Must support -40°C to 125°C range
Compliance: Must maintain ROHS3 compliance and MSL 1 rating

Secondary Compatibility Factors:

Slew rate, gain bandwidth product, and output current capacity may vary within acceptable application-dependent ranges
Input bias current and input offset voltage variations are acceptable if within general-purpose amplifier specifications
Product status (Active vs. Last Time Buy vs. Obsolete) affects long-term availability but does not disqualify functional equivalence

Substitute parts are organized into two categories:

Direct Packaging Equivalents: Parts with identical or compatible packaging (tube, cut tape, tape & reel)
Functional Equivalents: Parts meeting all critical electrical and mechanical parameters despite minor specification variations

Parameter Comparison

Part Number	Manufacturer	Circuits	Output Type	Slew Rate (V/µs)	GBW (MHz)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package	Status
MAX4478ASD	Analog Devices	4	Push-Pull, Rail-to-Rail	3	10	2.7	5.5	-40 to 125	14-SOIC	Obsolete
MAX4478ASD+	Analog Devices	4	Push-Pull, Rail-to-Rail	3	10	2.7	5.5	-40 to 125	14-SOIC	Active
LMV324MX/NOPB	Texas Instruments	4	Rail-to-Rail	1	1	2.7	5.5	-40 to 125	14-SOIC	Active
LMV324QDR	Texas Instruments	4	Rail-to-Rail	1	1	2.7	5.5	-40 to 125	14-SOIC	Active
LMV324QD	Texas Instruments	4	Rail-to-Rail	1	1	2.7	5.5	-40 to 125	14-SOIC	Last Time Buy
LMV324M/NOPB	Texas Instruments	4	Rail-to-Rail	1	1	2.7	5.5	-40 to 125	14-SOIC	Active
LMV324ID	Texas Instruments	4	Rail-to-Rail	1	1	2.7	5.5	-40 to 125	14-SOIC	Last Time Buy
LMV324IDR	UMW	4	Rail-to-Rail	—	1	2.1	5.5	-25 to 85	14-SOIC	Active
LMP2234BMA/NOPB	Texas Instruments	4	Differential, Rail-to-Rail	0.048	0.13	1.6	5.5	-40 to 125	14-SOIC	Active
LMP2234BMAE/NOPB	Texas Instruments	4	Differential, Rail-to-Rail	0.048	0.13	1.6	5.5	-40 to 125	14-SOIC	Active
LMP2234BMAX/NOPB	Texas Instruments	4	Differential, Rail-to-Rail	0.048	0.13	1.6	5.5	-40 to 125	14-SOIC	Active

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Highest Compatibility):

The MAX4478ASD+ is the primary direct replacement. This part is manufactured by the same supplier (Analog Devices Inc./Maxim Integrated) and maintains identical electrical specifications, circuit count, output type, and package configuration. The only difference is product status: MAX4478ASD+ is Active, whereas the original MAX4478ASD is Obsolete. This part is available in Tube packaging and provides seamless design compatibility without circuit modification.

Tier 2 - Functional Equivalents (Rail-to-Rail, Active Status):

The LMV324MX/NOPB, LMV324QDR, and LMV324M/NOPB are functionally equivalent substitutes manufactured by Texas Instruments. All three maintain the critical parameters: four circuits, 14-SOIC package, rail-to-rail output, -40°C to 125°C operating range, and 2.7V to 5.5V supply span. These parts are in Active production status, ensuring long-term availability. The LMV324MX/NOPB offers the highest inventory (177,800 pcs) and is packaged in Cut Tape & Digi-Reel format, suitable for high-volume production. The LMV324QDR is also in Active status with 3,000 pcs available in Cut Tape & Digi-Reel packaging.

Specification differences include lower slew rate (1V/µs vs. 3V/µs) and lower gain bandwidth product (1 MHz vs. 10 MHz). These differences are acceptable for applications not requiring the higher bandwidth and slew rate of the original MAX4478ASD.

Tier 3 - Last Time Buy Status (Limited Availability):

The LMV324QD and LMV324ID are electrically equivalent to Tier 2 parts but carry Last Time Buy status, indicating limited remaining inventory and no future production. These parts should be selected only when Tier 1 or Tier 2 options are unavailable, as they represent end-of-life components.

Tier 4 - Alternative Manufacturer (Conditional Use):

The LMV324IDR manufactured by UMW is available in high volume (95,200 pcs) but has a narrower operating temperature range (-25°C to 85°C vs. -40°C to 125°C) and lower minimum supply voltage (2.1V vs. 2.7V). This part is suitable only for applications operating within the -25°C to 85°C range.

Tier 5 - Differential Output Variants (Application-Specific):

The LMP2234BMA/NOPB, LMP2234BMAE/NOPB, and LMP2234BMAX/NOPB feature differential output instead of push-pull output and significantly lower bandwidth (130 kHz vs. 10 MHz). These parts are suitable only for low-frequency, low-power applications where differential output is required. They are not recommended as general replacements for the MAX4478ASD.

Compliance & Certification:

All recommended Tier 1 and Tier 2 substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original MAX4478ASD specifications. All parts are classified under ECCN EAR99 and HTSUS 8542.33.0001.

Frequently Asked Questions (FAQ)

Q1: Can I directly replace MAX4478ASD with LMV324MX/NOPB without circuit modifications?

A: Yes, the LMV324MX/NOPB is a direct pin-compatible substitute. Both devices feature four circuits in a 14-SOIC package with identical pinout, rail-to-rail output, and compatible supply voltage range (2.7V to 5.5V). No circuit modifications are required. However, the LMV324MX/NOPB has lower slew rate (1V/µs vs. 3V/µs) and lower bandwidth (1 MHz vs. 10 MHz). Verify that your application does not require the higher performance specifications of the original part.

Q2: What is the difference between MAX4478ASD and MAX4478ASD+?

A: The MAX4478ASD+ is the active production variant of the obsolete MAX4478ASD. Both parts are electrically and mechanically identical. The primary difference is product status: MAX4478ASD+ is in Active production, while MAX4478ASD is Obsolete. The MAX4478ASD+ is the recommended replacement for the obsolete part and is available in Tube packaging with 1,900 pcs in stock.

Q3: Why do the LMP2234 series parts have different output types (Differential vs. Push-Pull)?

A: The LMP2234 series is designed for low-power, low-frequency applications requiring differential output configuration. The MAX4478ASD features push-pull, rail-to-rail output optimized for general-purpose amplification at moderate bandwidth. The LMP2234 series is not recommended as a direct replacement unless your application specifically requires differential output and can tolerate significantly lower bandwidth (130 kHz vs. 10 MHz).

Q4: Is the LMV324IDR suitable as a substitute for the MAX4478ASD?

A: The LMV324IDR is functionally compatible in terms of circuit count, package, and rail-to-rail output. However, it has two important limitations: (1) narrower operating temperature range (-25°C to 85°C vs. -40°C to 125°C), and (2) lower minimum supply voltage (2.1V vs. 2.7V). Use this part only if your application operates within the -25°C to 85°C temperature range. For full temperature range compatibility, select LMV324MX/NOPB or LMV324QDR instead.

Q5: What packaging options are available for substitute parts?

A: Substitute parts are available in three packaging formats: (1) Tube—suitable for lower-volume applications and manual assembly; (2) Cut Tape & Digi-Reel (CT)—standard for automated pick-and-place assembly; (3) Tape & Reel (TR)—optimized for high-volume production. The LMV324MX/NOPB offers the largest inventory (177,800 pcs) in Cut Tape & Digi-Reel format, making it ideal for production environments.

Q6: Are all substitute parts ROHS3 compliant?

A: Yes, all substitute parts listed in this reference maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original MAX4478ASD. All parts are classified under ECCN EAR99 for export control purposes.

Q7: Which substitute part offers the best long-term availability?

A: The LMV324MX/NOPB offers the best long-term availability with 177,800 pcs in stock and Active production status. This part is manufactured by Texas Instruments, a major supplier with established distribution networks. The LMV324QDR (3,000 pcs, Active status) is the second-best option for long-term availability.

Q8: Can I use LMV324QD or LMV324ID as substitutes?

A: Both parts are electrically equivalent to the LMV324MX/NOPB and LMV324QDR. However, both carry Last Time Buy status, indicating limited remaining inventory and no future production. Use these parts only when Tier 1 or Tier 2 options are unavailable. For new designs, select Active status parts (LMV324MX/NOPB or LMV324QDR) to ensure long-term component availability.

Q9: What are the key electrical differences between MAX4478ASD and LMV324MX/NOPB?

A: The primary differences are: (1) Slew Rate: MAX4478ASD = 3V/µs vs. LMV324MX/NOPB = 1V/µs; (2) Gain Bandwidth Product: MAX4478ASD = 10 MHz vs. LMV324MX/NOPB = 1 MHz; (3) Output Current: MAX4478ASD = 48 mA vs. LMV324MX/NOPB = 160 mA per channel. The LMV324MX/NOPB offers higher output current but lower bandwidth. Verify that your application can tolerate these trade-offs.

Q10: Is the 14-SOIC package identical across all substitute parts?

A: Yes, all substitute parts use the 14-SOIC package with 0.154" (3.90mm) width. This ensures mechanical compatibility with existing PCB layouts and assembly equipment. However, verify that your PCB footprint accommodates the standard 14-SOIC dimensions before finalizing the substitution.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message