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MAX4091ASA Equivalent & Substitute Parts
Part Overview
The MAX4091ASA is a general-purpose operational amplifier manufactured by Analog Devices Inc./Maxim Integrated, housed in an 8-SOIC surface-mount package. This device features rail-to-rail output capability and operates across a 2.7V to 6V supply voltage range, making it suitable for low-voltage analog signal processing applications. The MAX4091ASA is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain compatibility with the 8-SOIC package format and satisfy the electrical performance requirements of the original specification.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 1 | — |
| Output Type | Rail-to-Rail | — |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| Voltage - Supply Span (Min) | 2.7 | V |
| Voltage - Supply Span (Max) | 6 | V |
| Operating Temperature | -40°C ~ 125°C | — |
| Slew Rate | 0.2 | V/µs |
| Gain Bandwidth Product | 500 | kHz |
| Current - Input Bias | 20 | nA |
| Voltage - Input Offset | 30 | µV |
| Current - Supply | 130 | µA |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the MAX4091ASA is determined by strict adherence to the following electrical and mechanical parameters:
Primary Compatibility Criteria:
- Package format: 8-SOIC (0.154", 3.90mm Width)
- Mounting type: Surface Mount
- Output configuration: Rail-to-Rail
- Supply voltage range: Minimum 2.7V, Maximum 6V
- Operating temperature range: -40°C to 125°C (for industrial-grade variants)
- Single-circuit general-purpose amplifier topology
Electrical Performance Considerations: Substitute parts must operate within the specified supply voltage window and maintain rail-to-rail output capability. The slew rate (0.2V/µs), gain bandwidth product (500 kHz), input bias current (20 nA), input offset voltage (30 µV), and supply current (130 µA) define the performance envelope. Parts with superior electrical characteristics (higher slew rate, wider bandwidth, lower bias current) are functionally compatible but represent performance upgrades. Parts with degraded electrical characteristics remain compatible if they satisfy the minimum supply voltage and temperature requirements.
Regulatory Compliance: All substitute parts must maintain ROHS3 compliance and MSL rating of 1 (Unlimited) to ensure manufacturing compatibility and long-term reliability.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Slew Rate (V/µs) | GBW (kHz) | Input Bias (nA) | Input Offset (µV) | Supply Current (µA) | Temp Range (°C) | Packaging |
|---|---|---|---|---|---|---|---|---|---|
| MAX4091ASA | Analog Devices | Obsolete | 0.2 | 500 | 20 | 30 | 130 | -40 ~ 125 | Tube |
| MAX4091ASA+ | Analog Devices | Active | 0.2 | 500 | 20 | 30 | 130 | -40 ~ 125 | Tube |
| TLV2451AID | Texas Instruments | Obsolete | 0.11 | 220 | 0.5 | 300 | 23 | -40 ~ 125 | Tube |
| TLV2451AIDR | Texas Instruments | Active | 0.11 | 220 | 0.5 | 300 | 23 | -40 ~ 125 | Tape & Reel |
| TLV2451CD | Texas Instruments | Active | 0.11 | 220 | 0.5 | 300 | 23 | 0 ~ 70 | Tube |
| TLV2451CDR | Texas Instruments | Active | 0.11 | 220 | 0.5 | 300 | 23 | 0 ~ 70 | Tape & Reel |
| TLV2451IDR | Texas Instruments | Active | 0.11 | 220 | 0.5 | 300 | 23 | -40 ~ 125 | Cut Tape & Digi-Reel |
| TLV2461AID | Texas Instruments | Obsolete | 1.6 | 6400 | 1.3 | 500 | 550 | -40 ~ 125 | Tube |
| TLV2461AIDR | Texas Instruments | Active | 1.6 | 6400 | 1.3 | 500 | 550 | -40 ~ 125 | Tape & Reel |
| TLV2461CD | Texas Instruments | Active | 1.6 | 6400 | 1.3 | 500 | 550 | 0 ~ 70 | Tube |
| TLV2461CDR | Texas Instruments | Active | 1.6 | 6400 | 1.3 | 500 | 550 | 0 ~ 70 | Tape & Reel |
Engineering Selection Recommendations
Primary Recommendation: MAX4091ASA+
The MAX4091ASA+ is the direct successor to the MAX4091ASA, manufactured by Analog Devices Inc./Maxim Integrated. This part maintains identical electrical specifications and package format while offering active product status. The MAX4091ASA+ is the preferred substitution path for applications requiring exact performance matching and long-term supply continuity. Both parts are ROHS3 compliant with MSL rating of 1 (Unlimited).
Secondary Recommendation: TLV2451AIDR
The TLV2451AIDR, manufactured by Texas Instruments, is an active product suitable for applications where the MAX4091ASA+ is unavailable. This part operates within the required 2.7V to 6V supply range and maintains the -40°C to 125°C operating temperature specification. The TLV2451AIDR exhibits lower slew rate (0.11V/µs versus 0.2V/µs) and reduced gain bandwidth product (220 kHz versus 500 kHz), representing a performance reduction. However, the TLV2451AIDR demonstrates superior input bias current characteristics (0.5 nA versus 20 nA) and significantly lower supply current consumption (23 µA versus 130 µA). The Tape & Reel packaging format supports automated assembly processes.
Tertiary Recommendation: TLV2451IDR
The TLV2451IDR provides an alternative Texas Instruments solution with identical electrical specifications to the TLV2451AIDR and full -40°C to 125°C temperature range coverage. The Cut Tape & Digi-Reel packaging format accommodates both manual and automated component handling.
Performance-Enhanced Alternative: TLV2461AIDR
The TLV2461AIDR represents a performance-enhanced substitute with significantly improved slew rate (1.6V/µs) and gain bandwidth product (6.4 MHz). This part is suitable for applications requiring higher-speed signal processing while maintaining supply voltage and package compatibility. The TLV2461AIDR exhibits increased supply current consumption (550 µA versus 130 µA) and higher input offset voltage (500 µV versus 30 µV). Active product status and ROHS3 compliance ensure manufacturing continuity.
Temperature-Constrained Alternatives: TLV2451CD, TLV2451CDR, TLV2461CD, TLV2461CDR
These parts operate within the 0°C to 70°C temperature range and are suitable only for applications not requiring the full -40°C to 125°C industrial temperature specification. Selection of these variants should be limited to consumer-grade or controlled-environment applications.
Frequently Asked Questions (FAQ)
Q: Can the MAX4091ASA be directly replaced with the MAX4091ASA+?
A: Yes. The MAX4091ASA+ is the active production equivalent of the MAX4091ASA. Both parts share identical electrical specifications, package format (8-SOIC), and operating temperature range (-40°C to 125°C). The primary difference is product status: MAX4091ASA+ is active while MAX4091ASA is obsolete. Direct substitution is supported without circuit modification.
Q: What are the key differences between the MAX4091ASA and TLV2451AIDR?
A: Both parts operate within the 2.7V to 6V supply range and maintain rail-to-rail output in 8-SOIC packages. The MAX4091ASA provides higher slew rate (0.2V/µs versus 0.11V/µs) and wider gain bandwidth product (500 kHz versus 220 kHz). The TLV2451AIDR offers superior input bias current (0.5 nA versus 20 nA) and lower supply current (23 µA versus 130 µA). Selection depends on whether the application prioritizes signal speed or power efficiency.
Q: Is the TLV2461AIDR a suitable replacement for the MAX4091ASA?
A: The TLV2461AIDR is functionally compatible from a package and supply voltage perspective. However, this part represents a performance upgrade with 8× higher slew rate and 12.8× wider bandwidth. The TLV2461AIDR consumes 4.2× more supply current and exhibits higher input offset voltage. Use this part only when the application requires enhanced speed performance and can accommodate increased power consumption.
Q: What is the significance of packaging format (Tube, Tape & Reel, Cut Tape)?
A: Packaging format affects manufacturing process compatibility. Tube packaging suits manual assembly and small-volume production. Tape & Reel packaging supports automated pick-and-place equipment for high-volume manufacturing. Cut Tape & Digi-Reel format accommodates both manual and automated processes. The 8-SOIC package dimensions remain identical across all packaging formats, ensuring mechanical compatibility.
Q: Why do some substitute parts have restricted temperature ranges (0°C to 70°C)?
A: Parts designated with 0°C to 70°C operating temperature (such as TLV2451CD and TLV2461CD) are commercial-grade devices. The MAX4091ASA operates across -40°C to 125°C, covering industrial and extended temperature applications. Commercial-grade substitutes are suitable only for applications operating within the 0°C to 70°C window. Industrial applications requiring full -40°C to 125°C coverage must use industrial-grade variants (TLV2451AID, TLV2451AIDR, TLV2451IDR, TLV2461AID, TLV2461AIDR).
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL rating of 1 (Unlimited), ensuring compatibility with modern manufacturing processes and environmental regulations.
Q: What does "obsolete" product status mean for the MAX4091ASA?
A: Obsolete status indicates that Analog Devices Inc./Maxim Integrated has discontinued production of the MAX4091ASA. New designs should not incorporate this part. Existing inventory may be available through authorized distributors, but long-term supply cannot be guaranteed. The MAX4091ASA+ (active status) is the recommended path for new applications.
Q: Can I use TLV2451CD in place of TLV2451AIDR?
A: Both parts share identical electrical specifications and 8-SOIC package format. The primary difference is operating temperature range: TLV2451CD operates 0°C to 70°C while TLV2451AIDR operates -40°C to 125°C. Substitution is valid only if the application operates within the 0°C to 70°C window. For applications requiring full industrial temperature coverage, use TLV2451AIDR or TLV2451IDR.
Q: What is the relationship between input bias current and application performance?
A: Input bias current affects circuit accuracy in high-impedance applications. The MAX4091ASA exhibits 20 nA bias current, while TLV2451 variants provide 0.5 nA. Lower bias current reduces offset errors in transimpedance amplifier configurations and high-impedance sensor interfaces. For low-impedance applications, bias current differences are negligible.
Q: How does supply current consumption affect system design?
A: Supply current directly impacts power dissipation and thermal management. The MAX4091ASA consumes 130 µA per channel, while TLV2451 variants consume 23 µA. In battery-powered or thermally constrained applications, the TLV2451 series provides significant power efficiency advantages. The TLV2461 series consumes 550 µA, suitable only for applications where power consumption is not a limiting factor.
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