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MAX4478ASD-T Equivalent & Substitute Parts
Part Overview
The MAX4478ASD-T is a general purpose operational amplifier manufactured by Analog Devices Inc./Maxim Integrated, configured as a 4-circuit integrated circuit in 14-SOIC surface mount packaging. This device features push-pull, rail-to-rail output architecture with a 10 MHz gain bandwidth product and 3V/µs slew rate, designed for low-power analog signal processing applications across supply voltages from 2.7V to 5.5V.
The MAX4478ASD-T is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this component.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| 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 (x4 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 | -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-T are selected based on strict electrical and mechanical compatibility criteria. The following parameters determine substitution eligibility:
Primary Compatibility Criteria:
- Number of Circuits: 4 (quad configuration required)
- Package / Case: 14-SOIC surface mount form factor
- Voltage - Supply Span: Minimum 2.7V to Maximum 5.5V overlap
- Operating Temperature: -40°C to 125°C range
- Output Type: Rail-to-Rail capability
- Mounting Type: Surface Mount
Secondary Performance Parameters:
- Gain Bandwidth Product: 10 MHz or greater
- Slew Rate: 3V/µs or greater
- Current - Output / Channel: 48 mA or greater
- Current - Input Bias: 1 pA or lower
- Voltage - Input Offset: 70 µV or lower
Substitute parts are grouped into two categories: direct equivalents (identical base product number with different packaging) and functional alternatives (different manufacturers meeting all primary and secondary criteria).
Parameter Comparison
| Part Number | Manufacturer | Product Status | Amplifier Type | Slew Rate (V/µs) | GBW (MHz) | Input Bias (pA) | Input Offset (µV) | Supply Current (mA) | Output Current (mA) | Supply Min (V) | Supply Max (V) | Package |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MAX4478ASD-T | Analog Devices | Obsolete | General Purpose | 3 | 10 | 1 | 70 | 2.5 | 48 | 2.7 | 5.5 | 14-SOIC |
| MAX4478ASD+T | Analog Devices | Active | General Purpose | 3 | 10 | 1 | 70 | 2.5 | 48 | 2.7 | 5.5 | 14-SOIC |
| AD8608ARZ | Analog Devices | Active | CMOS | 5 | 10 | 1 | 80 | 1 | 80 | 2.7 | 5.5 | 14-SOIC |
| AD8608ARZ-REEL | Analog Devices | Active | CMOS | 5 | 10 | 1 | 80 | 1 | 80 | 2.7 | 5.5 | 14-SOIC |
| AD8608ARZ-REEL7 | Analog Devices | Active | CMOS | 5 | 10 | 1 | 80 | 1 | 80 | 2.7 | 5.5 | 14-SOIC |
| LMP2234BMA/NOPB | Texas Instruments | Active | General Purpose | 0.048 | 0.13 | 0.02 | 10 | 0.036 | 30 | 1.6 | 5.5 | 14-SOIC |
| LMP2234BMAE/NOPB | Texas Instruments | Active | General Purpose | 0.048 | 0.13 | 0.02 | 10 | 0.036 | 30 | 1.6 | 5.5 | 14-SOIC |
| LMP2234BMAX/NOPB | Texas Instruments | Active | General Purpose | 0.048 | 0.13 | 0.02 | 10 | 0.036 | 30 | 1.6 | 5.5 | 14-SOIC |
| LMV324ID | Texas Instruments | Last Time Buy | General Purpose | 1 | 1 | 15000 | 1700 | 0.41 | 40 | 2.7 | 5.5 | 14-SOIC |
| LMV324IDR | UMW | Active | Voltage Feedback | — | 1 | 10 | 800 | 0.045 | 25 | 2.1 | 5.5 | 14-SOIC |
| LMV324M/NOPB | Texas Instruments | Active | General Purpose | 1 | 1 | 15000 | 1700 | 0.41 | 160 | 2.7 | 5.5 | 14-SOIC |
Engineering Selection Recommendations
Direct Equivalent (Recommended Primary Substitute):
MAX4478ASD+T is the direct equivalent of MAX4478ASD-T, differing only in packaging format (Cut Tape & Digi-Reel versus standard tube packaging). This part maintains identical electrical specifications and is classified as Active product status. Selection of MAX4478ASD+T eliminates obsolescence risk while preserving all functional and performance characteristics. ROHS3 compliance and MSL 1 rating are maintained.
Functional Alternatives (Secondary Substitutes):
AD8608ARZ, AD8608ARZ-REEL, and AD8608ARZ-REEL7 are CMOS-based alternatives manufactured by Analog Devices. These parts exceed the slew rate specification (5V/µs versus 3V/µs) and output current capability (80 mA versus 48 mA per channel), while reducing supply current consumption (1 mA versus 2.5 mA total). All three variants maintain 10 MHz gain bandwidth product, 14-SOIC packaging, and 2.7V to 5.5V supply range. Differences among AD8608 variants are limited to packaging format (Tube, Cut Tape & Digi-Reel, or Cut Tape & Digi-Reel7). All are Active status products with ROHS3 compliance.
LMV324M/NOPB offers the highest output current per channel (160 mA) among alternatives, with identical supply voltage range and operating temperature. This part is Active status with ROHS3 compliance. However, slew rate (1V/µs) and gain bandwidth product (1 MHz) are reduced compared to MAX4478ASD-T specifications.
LMP2234 variants (BMA/NOPB, BMAE/NOPB, BMAX/NOPB) are Texas Instruments general purpose amplifiers with extended lower supply voltage capability (1.6V minimum). These parts feature superior input offset voltage (10 µV) and input bias current (0.02 pA). However, slew rate (0.048V/µs), gain bandwidth product (130 kHz), and output current per channel (30 mA) are significantly reduced. These parts are suitable only for low-speed, low-power applications.
LMV324ID is classified as Last Time Buy status and should not be selected for new designs requiring long-term supply assurance.
LMV324IDR (UMW manufacturer) is Active status but exhibits reduced output current capability (25 mA) and narrower operating temperature range (-25°C to 85°C) compared to MAX4478ASD-T specifications.
Compliance Summary:
All recommended substitutes maintain ROHS3 compliance, MSL 1 rating, and EAR99 export classification. All are suitable for -40°C to 125°C operating temperature range except LMV324IDR (-25°C to 85°C).
Frequently Asked Questions (FAQ)
Q: Can MAX4478ASD+T be used as a direct replacement for MAX4478ASD-T?
A: Yes. MAX4478ASD+T is electrically and functionally identical to MAX4478ASD-T. The only difference is packaging format: MAX4478ASD+T is supplied in Cut Tape & Digi-Reel format, while MAX4478ASD-T uses tube packaging. Both are 14-SOIC surface mount packages with identical pinout and electrical specifications. MAX4478ASD+T is Active status, eliminating obsolescence concerns.
Q: What are the key differences between MAX4478ASD-T and AD8608ARZ?
A: Both are quad operational amplifiers in 14-SOIC packaging with 10 MHz gain bandwidth product and 2.7V to 5.5V supply range. AD8608ARZ uses CMOS architecture versus the general purpose design of MAX4478ASD-T. AD8608ARZ provides higher slew rate (5V/µs versus 3V/µs), higher output current per channel (80 mA versus 48 mA), and lower total supply current (1 mA versus 2.5 mA). Input offset voltage is slightly higher (80 µV versus 70 µV). AD8608ARZ is Active status.
Q: Are LMP2234 variants suitable replacements for MAX4478ASD-T?
A: LMP2234 variants meet the 14-SOIC packaging and quad circuit requirements, but performance specifications differ significantly. Slew rate is reduced to 0.048V/µs (versus 3V/µs), gain bandwidth product is 130 kHz (versus 10 MHz), and output current per channel is 30 mA (versus 48 mA). LMP2234 variants are suitable only for low-speed, low-power applications where these reduced specifications are acceptable. Extended lower supply voltage capability (1.6V minimum) may be advantageous in some designs.
Q: What is the difference between AD8608ARZ, AD8608ARZ-REEL, and AD8608ARZ-REEL7?
A: These three part numbers are electrically identical CMOS amplifiers with identical electrical specifications. Differences are limited to packaging and tape format: AD8608ARZ is supplied in Tube packaging; AD8608ARZ-REEL and AD8608ARZ-REEL7 are supplied in Cut Tape & Digi-Reel format. Selection depends on assembly process requirements and tape reel specifications. All three are Active status products.
Q: Why is LMV324ID not recommended as a substitute?
A: LMV324ID is classified as Last Time Buy status, indicating that the manufacturer has announced end-of-life production. This status creates supply chain risk for ongoing production requirements. Additionally, LMV324ID exhibits reduced slew rate (1V/µs), reduced gain bandwidth product (1 MHz), and significantly higher input bias current (15 nA versus 1 pA) compared to MAX4478ASD-T. For new designs or long-term production, Active status alternatives are preferred.
Q: Does LMV324IDR meet the operating temperature requirements of MAX4478ASD-T?
A: No. LMV324IDR operates over -25°C to 85°C temperature range, which does not cover the full -40°C to 125°C range specified for MAX4478ASD-T. This part is unsuitable for applications requiring extended temperature operation. Additionally, output current per channel (25 mA) is below the 48 mA specification of MAX4478ASD-T.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the compliance profile of MAX4478ASD-T. All parts are classified as EAR99 for export purposes.
Q: Which substitute offers the best performance improvement over MAX4478ASD-T?
A: AD8608ARZ variants provide the most significant performance improvements: slew rate increases from 3V/µs to 5V/µs, output current per channel increases from 48 mA to 80 mA, and supply current decreases from 2.5 mA to 1 mA total. These improvements are achieved while maintaining identical 10 MHz gain bandwidth product, 14-SOIC packaging, and 2.7V to 5.5V supply range. AD8608ARZ is Active status with full -40°C to 125°C operating temperature range.
Q: Can LMV324M/NOPB be used in high-current output applications?
A: Yes. LMV324M/NOPB provides 160 mA output current per channel, which is significantly higher than MAX4478ASD-T (48 mA per channel). However, this part exhibits reduced slew rate (1V/µs versus 3V/µs) and reduced gain bandwidth product (1 MHz versus 10 MHz). Selection should be based on specific application requirements for output current versus bandwidth and slew rate performance.
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