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MAX494ESD-T Equivalent & Substitute Parts Reference
Part Overview
The MAX494ESD-T 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 rail-to-rail amplifier operates across a 2.7V to 6V supply range with a slew rate of 0.2V/µs and 500 kHz gain bandwidth product. The device is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain compatibility across electrical specifications, package geometry, and operating temperature ranges while considering current product availability and compliance status.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| Output Type | Rail-to-Rail | — |
| 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 |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for the MAX494ESD-T are categorized based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:
Critical Matching Parameters:
- Four independent operational amplifier circuits
- Rail-to-rail output configuration
- 14-SOIC surface-mount package (0.154" width, 3.90mm)
- Supply voltage range: 2.7V to 6V minimum compatibility
- Operating temperature range: minimum -40°C to 85°C coverage
Secondary Compatibility Factors:
- Slew rate and gain bandwidth product (performance tier classification)
- Input bias current and input offset voltage (precision characteristics)
- Supply current and output current per channel (power budget considerations)
- Product status and compliance certifications (design lifecycle and regulatory requirements)
Substitutes are grouped into two categories: Direct Equivalents (identical electrical specifications and packaging) and Functional Alternatives (compatible electrical parameters with potential performance enhancements or trade-offs).
Parameter Comparison
| Part Number | Manufacturer | Product Status | Slew Rate (V/µs) | GBW (kHz) | Input Bias (nA) | Input Offset (µV) | Supply Current (µA) | Output Current (mA) | Temp Range (°C) | RoHS |
|---|---|---|---|---|---|---|---|---|---|---|
| MAX494ESD-T | Analog Devices | Obsolete | 0.2 | 500 | 25 | 200 | 150 | 30 | -40 to 85 | ROHS3 |
| MAX494ESD+T | Analog Devices | Active | 0.2 | 500 | 25 | 200 | 150 | 30 | -40 to 85 | ROHS3 |
| LMV324MX | National Semiconductor | Active | 1.0 | 1000 | 15 | 1700 | 410 | 160 | -40 to 125 | Non-compliant |
| LMV324QD | Texas Instruments | Last Time Buy | 1.0 | 1000 | 15 | 1700 | 410 | 40 | -40 to 125 | ROHS3 |
| TLV2454AID | Texas Instruments | Active | 0.11 | 220 | 0.5 | 300 | 23 | 10 | -40 to 125 | ROHS3 |
| TLV2454AIDR | Texas Instruments | Active | 0.11 | 220 | 0.5 | 300 | 23 | 10 | -40 to 125 | ROHS3 |
| TLV2454CD | Texas Instruments | Obsolete | 0.11 | 220 | 0.5 | 300 | 23 | 10 | 0 to 70 | ROHS3 |
| TLV2454ID | Texas Instruments | Active | 0.11 | 220 | 0.5 | 300 | 23 | 10 | -40 to 125 | ROHS3 |
| TLV2454IDR | Texas Instruments | Active | 0.11 | 220 | 0.5 | 300 | 23 | 10 | -40 to 125 | ROHS3 |
| TLV2464AID | Texas Instruments | Active | 1.6 | 6400 | 1.3 | 500 | 550 | 80 | -40 to 125 | ROHS3 |
| TLV2464AIDR | Texas Instruments | Active | 1.6 | 6400 | 1.3 | 500 | 550 | 80 | -40 to 125 | ROHS3 |
Engineering Selection Recommendations
Direct Equivalent (Recommended Primary Substitute):
The MAX494ESD+T is the direct equivalent to MAX494ESD-T, offering identical electrical specifications and package configuration. The primary distinction is product status: MAX494ESD+T is active with 1976 units in stock, compared to the obsolete MAX494ESD-T with 858 units. Both maintain ROHS3 compliance and identical performance characteristics. Selection of MAX494ESD+T is appropriate for designs requiring no performance modification and maximum supply chain continuity.
Active Alternatives with Enhanced Performance:
The TLV2464AIDR and TLV2464AID (Texas Instruments) provide superior performance metrics: 1.6V/µs slew rate (8× improvement), 6.4 MHz gain bandwidth product (12.8× improvement), and 80 mA output current per channel (2.67× improvement). These devices maintain the 2.7V to 6V supply range and 14-SOIC package. Extended operating temperature range (-40°C to 125°C) and ROHS3 compliance support long-term design requirements. Supply availability is strong: 6235 units (TLV2464AIDR) and 1940 units (TLV2464AID).
Low-Power Alternative:
The TLV2454AIDR and TLV2454IDR (Texas Instruments) offer significantly reduced supply current (23µA vs. 150µA), suitable for battery-powered or power-constrained applications. Trade-offs include lower slew rate (0.11V/µs) and reduced output current (10 mA per channel). Extended temperature range (-40°C to 125°C) and ROHS3 compliance are maintained. Inventory availability is excellent: 12700 units (TLV2454IDR) and 6099 units (TLV2454AIDR).
Compliance Considerations:
LMV324MX (National Semiconductor) is not RoHS3 compliant and is marked as RoHS non-compliant, limiting applicability in regulated markets. LMV324QD (Texas Instruments) carries Last Time Buy status, indicating end-of-life trajectory despite current active classification. Both offer enhanced performance (1V/µs slew rate, 1 MHz GBW) but present supply chain risk.
Frequently Asked Questions (FAQ)
Q: Can MAX494ESD+T directly replace MAX494ESD-T without circuit modification?
A: Yes. MAX494ESD+T is electrically and mechanically identical to MAX494ESD-T. Both feature identical slew rate (0.2V/µs), gain bandwidth product (500 kHz), supply voltage range (2.7V to 6V), operating temperature range (-40°C to 85°C), and 14-SOIC package. No design changes are required.
Q: What are the key differences between TLV2464AIDR and the original MAX494ESD-T?
A: TLV2464AIDR provides enhanced performance: 8× faster slew rate (1.6V/µs vs. 0.2V/µs), 12.8× higher gain bandwidth product (6.4 MHz vs. 500 kHz), and 2.67× greater output current per channel (80 mA vs. 30 mA). Supply voltage range remains compatible (2.7V to 6V). Operating temperature extends to 125°C. Higher supply current (550µA vs. 150µA) is the primary trade-off. Circuits designed for the MAX494ESD-T will function with TLV2464AIDR, though performance characteristics will differ.
Q: Is TLV2454AIDR suitable for applications requiring 30 mA output current per channel?
A: No. TLV2454AIDR provides only 10 mA output current per channel, compared to MAX494ESD-T's 30 mA. Applications requiring higher output current must use TLV2464AIDR (80 mA) or maintain MAX494ESD+T. TLV2454AIDR is appropriate for low-power signal conditioning and buffering applications where output current demands are minimal.
Q: What is the significance of packaging designation differences (Tube vs. Tape & Reel)?
A: Packaging designation indicates the form factor for component delivery and automated assembly. Tube packaging (TLV2454AID, TLV2464AID) is suitable for manual assembly or lower-volume production. Tape & Reel (TR) and Cut Tape & Digi-Reel® packaging (TLV2454AIDR, TLV2464AIDR, MAX494ESD+T) are optimized for high-speed automated pick-and-place assembly. All variants maintain identical 14-SOIC package geometry and electrical specifications. Selection depends on production volume and assembly equipment capability.
Q: Why is LMV324MX not recommended despite superior performance?
A: LMV324MX is not RoHS3 compliant and carries RoHS non-compliant status. This restricts use in applications subject to RoHS regulations, including consumer electronics, automotive, and industrial equipment in regulated markets. Additionally, National Semiconductor manufacturing status and supply chain continuity present long-term sourcing risk compared to active Texas Instruments and Analog Devices products.
Q: Can TLV2454CD substitute for MAX494ESD-T in extended temperature applications?
A: TLV2454CD is not suitable. Although electrically compatible with the MAX494ESD-T, TLV2454CD operates only across 0°C to 70°C, which does not cover the MAX494ESD-T's -40°C to 85°C range. Applications requiring full -40°C to 85°C operation must use TLV2454AID, TLV2454AIDR, TLV2454ID, or TLV2454IDR. Additionally, TLV2454CD is classified as obsolete.
Q: What is the impact of input bias current differences on circuit design?
A: MAX494ESD-T specifies 25 nA input bias current. TLV2454 variants reduce this to 0.5 nA (50× improvement), while TLV2464 variants specify 1.3 nA. Lower input bias current reduces errors in high-impedance circuits and transimpedance amplifier configurations. For applications with input impedances below 1 MΩ, input bias current differences are negligible. High-impedance sensor interfaces (>10 MΩ) benefit from TLV2454 or TLV2464 selection.
Q: Are all substitute parts ROHS3 compliant?
A: No. MAX494ESD+T, LMV324QD, TLV2454 series (all variants), and TLV2464 series (all variants) are ROHS3 compliant. LMV324MX is explicitly non-compliant. Designs subject to RoHS regulations must exclude LMV324MX and select from the compliant alternatives.
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