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MAX494ESD Equivalent & Substitute Parts
Part Overview
The MAX494ESD is a general-purpose operational amplifier featuring four independent circuits in a 14-SOIC surface-mount package. Manufactured by Analog Devices Inc./Maxim Integrated, this device provides rail-to-rail output capability with a supply voltage range of 2.7V to 6V and operates across the industrial temperature range of -40°C to 85°C. The MAX494ESD is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain functional compatibility through matching package type, circuit count, output configuration, and electrical performance within acceptable operating parameters.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| Output Type | Rail-to-Rail | — |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | — |
| Slew Rate | 0.2 | V/µs |
| Gain Bandwidth Product | 500 | kHz |
| Current - Input Bias | 25 | nA |
| Voltage - Input Offset | 200 | µV |
| Current - Supply (x4 Channels) | 150 | µA |
| Current - Output / Channel | 30 | mA |
| Voltage - Supply Span (Min) | 2.7 | V |
| Voltage - Supply Span (Max) | 6 | V |
| Operating Temperature | -40 to 85 | °C |
| Mounting Type | Surface Mount | — |
| RoHS Status | RoHS non-compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the MAX494ESD is determined by strict adherence to the following electrical and mechanical parameters:
Primary Compatibility Criteria:
- Package type: 14-SOIC surface-mount only
- Circuit count: Four independent amplifier circuits required
- Output configuration: Rail-to-rail output mandatory
- Supply voltage range: Minimum 2.7V, maximum 6V (or compatible subset)
- Operating temperature: -40°C to 85°C minimum coverage required
Secondary Compatibility Criteria:
- Slew rate: 0.2V/µs or greater
- Gain bandwidth product: 500 kHz or greater
- Input bias current: 25 nA or lower
- Input offset voltage: 200 µV or lower
- Output current per channel: 30 mA or greater
- Supply current: 150µA (x4 channels) or lower
Substitute parts are grouped into two categories based on product status and compliance:
Category 1: Direct Packaging Variants – Parts with identical electrical specifications but different packaging configurations (tube vs. tape & reel).
Category 2: Functional Equivalents – Parts meeting or exceeding all primary and secondary compatibility criteria, with enhanced performance characteristics in specific parameters.
Parameter Comparison
| Part Number | Manufacturer | Amplifier Type | Circuits | Output Type | Slew Rate (V/µs) | GBW (kHz) | Input Bias (nA) | Input Offset (µV) | Supply Current (µA) | Output Current (mA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Product Status | RoHS |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MAX494ESD | Analog Devices | General Purpose | 4 | Rail-to-Rail | 0.2 | 500 | 25 | 200 | 150 | 30 | 2.7 | 6 | -40 to 85 | Obsolete | Non-compliant |
| MAX494ESD+ | Analog Devices | General Purpose | 4 | Rail-to-Rail | 0.2 | 500 | 25 | 200 | 150 | 30 | 2.7 | 6 | -40 to 85 | Active | ROHS3 Compliant |
| AD8609ARZ-REEL | Analog Devices | CMOS | 4 | Rail-to-Rail | 0.1 | 400 | 0.002 | 12 | 40 | 70 | 1.8 | 5 | -40 to 125 | Active | ROHS3 Compliant |
| AD8609ARZ-REEL7 | Analog Devices | CMOS | 4 | Rail-to-Rail | 0.1 | 400 | 0.002 | 12 | 40 | 70 | 1.8 | 5 | -40 to 125 | Active | ROHS3 Compliant |
| LMV324MX/NOPB | Texas Instruments | General Purpose | 4 | Rail-to-Rail | 1 | 1000 | 15 | 1700 | 410 | 160 | 2.7 | 5.5 | -40 to 125 | Active | ROHS3 Compliant |
| LMV324QD | Texas Instruments | General Purpose | 4 | Rail-to-Rail | 1 | 1000 | 15 | 1700 | 410 | 40 | 2.7 | 5.5 | -40 to 125 | Last Time Buy | ROHS3 Compliant |
| LMV324QDR | Texas Instruments | General Purpose | 4 | Rail-to-Rail | 1 | 1000 | 15 | 1700 | 410 | 40 | 2.7 | 5.5 | -40 to 125 | Active | ROHS3 Compliant |
| MCP624-E/SL | Microchip Technology | General Purpose | 4 | Rail-to-Rail | 10 | 20000 | 0.005 | 200 | 2500 | 70 | 2.5 | 5.5 | -40 to 125 | Active | ROHS3 Compliant |
| MCP624T-E/SL | Microchip Technology | General Purpose | 4 | Rail-to-Rail | 10 | 20000 | 0.005 | 200 | 2500 | 70 | 2.5 | 5.5 | -40 to 125 | Active | ROHS3 Compliant |
| TLV2454AID | Texas Instruments | General Purpose | 4 | Rail-to-Rail | 0.11 | 220 | 500 | 300 | 23 | 10 | 2.7 | 6 | -40 to 125 | Active | ROHS3 Compliant |
| TLV2454AIDR | Texas Instruments | General Purpose | 4 | Rail-to-Rail | 0.11 | 220 | 500 | 300 | 23 | 10 | 2.7 | 6 | -40 to 125 | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Replacement (Identical Electrical Performance):
MAX494ESD+ is the recommended direct replacement. This part maintains identical electrical specifications to the MAX494ESD while offering active product status and ROHS3 compliance. The transition from obsolete to active status ensures long-term availability and supply chain stability. Packaging is available in tube format, suitable for standard component handling and storage.
Functional Equivalents with Enhanced Performance:
The following parts meet or exceed all primary compatibility criteria and are suitable for new designs or redesigns where enhanced performance is acceptable:
LMV324QDR (Texas Instruments) – Recommended for applications requiring extended temperature range (-40°C to 125°C) and higher slew rate (1V/µs). Supply voltage range (2.7V to 5.5V) is compatible with MAX494ESD applications. Active product status ensures availability. Output current per channel (40 mA) exceeds minimum requirement.
MCP624-E/SL or MCP624T-E/SL (Microchip Technology) – Suitable for applications requiring significantly higher bandwidth (20 MHz) and faster slew rate (10V/µs). Supply voltage range (2.5V to 5.5V) covers MAX494ESD operating envelope. Extended temperature range (-40°C to 125°C) provides additional margin. Higher supply current (2.5 mA per channel) must be evaluated against power budget constraints.
AD8609ARZ-REEL or AD8609ARZ-REEL7 (Analog Devices) – CMOS technology provides extremely low input bias current (0.2 pA) and superior input offset voltage (12 µV). Supply voltage range (1.8V to 5V) is narrower than MAX494ESD but covers standard 3.3V and 5V systems. Lower slew rate (0.1V/µs) and gain bandwidth product (400 kHz) may limit high-frequency applications.
TLV2454AID or TLV2454AIDR (Texas Instruments) – Optimized for ultra-low power applications with supply current of 23µA (x4 channels). Supply voltage range (2.7V to 6V) matches MAX494ESD exactly. Extended temperature range (-40°C to 125°C) provides additional margin. Lower output current per channel (10 mA) and slew rate (0.11V/µs) restrict use to low-speed, low-power circuits.
Compliance and Certification:
All recommended substitute parts carry ROHS3 compliance certification, addressing environmental and regulatory requirements. The MAX494ESD is RoHS non-compliant; migration to compliant alternatives is necessary for new production and long-term supply chain management. All parts maintain MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard storage and handling procedures.
Frequently Asked Questions (FAQ)
Q: Can MAX494ESD be directly replaced with MAX494ESD+?
A: Yes. MAX494ESD+ is electrically and mechanically identical to MAX494ESD. The primary differences are active product status and ROHS3 compliance. No circuit modifications are required. Packaging format differs (tube vs. original packaging); verify compatibility with assembly equipment and storage procedures.
Q: What is the key difference between MAX494ESD and LMV324QDR?
A: Both are four-circuit general-purpose rail-to-rail amplifiers in 14-SOIC packages. LMV324QDR offers higher slew rate (1V/µs vs. 0.2V/µs), higher gain bandwidth product (1 MHz vs. 500 kHz), and extended temperature range (-40°C to 125°C vs. -40°C to 85°C). Supply voltage range for LMV324QDR is 2.7V to 5.5V, slightly narrower than MAX494ESD (2.7V to 6V). LMV324QDR is suitable for applications requiring faster signal processing and wider temperature operation.
Q: Can MCP624-E/SL replace MAX494ESD in all applications?
A: MCP624-E/SL meets all primary compatibility criteria and exceeds secondary performance parameters. However, significantly higher supply current (2.5 mA per channel vs. 150 µA total) may impact power consumption budgets. Verify power supply capacity and thermal design before substitution. MCP624-E/SL is recommended for new designs where higher bandwidth (20 MHz) and faster slew rate (10V/µs) provide functional advantage.
Q: What is the difference between AD8609ARZ-REEL and AD8609ARZ-REEL7?
A: Both parts are electrically identical CMOS four-circuit amplifiers. The difference is packaging format: AD8609ARZ-REEL uses standard tape & reel packaging, while AD8609ARZ-REEL7 uses cut tape & Digi-Reel® format. Select based on assembly equipment compatibility and component handling procedures. Electrical performance and pin configuration are identical.
Q: Is TLV2454AIDR suitable for high-speed applications?
A: No. TLV2454AIDR is optimized for ultra-low power operation with slew rate of 0.11V/µs and gain bandwidth product of 220 kHz. These parameters are lower than MAX494ESD (0.2V/µs and 500 kHz). TLV2454AIDR is suitable only for low-speed, low-power circuits. For high-speed applications, select LMV324QDR or MCP624-E/SL.
Q: What is the supply voltage compatibility range for substitute parts?
A: MAX494ESD operates from 2.7V to 6V. Substitute parts have varying ranges: LMV324QDR (2.7V to 5.5V), MCP624-E/SL (2.5V to 5.5V), AD8609ARZ-REEL (1.8V to 5V), TLV2454AIDR (2.7V to 6V). Verify that the selected substitute part's supply voltage range encompasses the application's operating envelope. TLV2454AIDR and MAX494ESD+ match the original 2.7V to 6V range exactly.
Q: Are all substitute parts RoHS compliant?
A: Yes. All recommended substitute parts carry ROHS3 compliance certification. MAX494ESD is RoHS non-compliant. Migration to compliant alternatives is necessary for new production and regulatory compliance in markets requiring RoHS certification.
Q: What is the package compatibility for all listed parts?
A: All parts use 14-SOIC surface-mount package (0.154", 3.90mm width). Pin configuration and footprint are identical across all parts. PCB layout and assembly procedures require no modification. Verify component placement and soldering parameters with assembly equipment specifications.
Q: Can I use AD8609ARZ-REEL in a 6V supply application?
A: No. AD8609ARZ-REEL maximum supply voltage is 5V. MAX494ESD operates up to 6V. If the application requires 6V operation, select TLV2454AIDR, MAX494ESD+, or LMV324QDR, all of which support 6V supply voltage.
Q: What is the output current capability difference between substitute parts?
A: MAX494ESD provides 30 mA per channel. Substitutes vary: LMV324QDR (40 mA), MCP624-E/SL (70 mA), AD8609ARZ-REEL (70 mA), TLV2454AIDR (10 mA). Verify that the selected part's output current capability meets load requirements. TLV2454AIDR is limited to 10 mA per channel and is unsuitable for high-current applications.
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