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Analog Devices Inc./Maxim Integrated MAX4491AKA-T
- Part No.:
- MAX4491AKA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8
- Datasheet:
-
MAX4491AKA-T.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,092
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Product details
Overview
MAX4491AKA-T from Maxim Integrated is a single-channel, rail-to-rail input/output CMOS operational amplifier in SC70-5 package, rated for -40°C to +125°C automotive operation. It delivers 10MHz gain-bandwidth, 10V/µs slew rate, 55mV output swing into 2kΩ loads, 50pA input bias current, and operates from 2.7V to 5.5V single supply - ideal for high-side current sensing and low-voltage sensor signal conditioning.
For engineers reviewing the MAX4491AKA-T datasheet, MAX4491AKA-T pinout, MAX4491AKA-T application, or MAX4491AKA-T equivalent, this page provides verified electrical parameters, validated SC70-5 pin mapping, temperature-stable performance data across -40°C to +125°C, and real-world design guidance for capacitive-load stability and rail-to-rail interface integrity.
Technical Context
The MAX4491AKA-T employs parallel N- and P-channel differential input stages enabling true rail-to-rail common-mode input range (VSS to VDD), with seamless handoff near VSS + 1.2V and VDD – 1.2V. Its class-AB push-pull output stage achieves 55mV swing into 2kΩ at both rails across full temperature range.
It maintains unity-gain stability with up to 300pF capacitive load without external compensation, supported by 60° phase margin and 10dB gain margin at 10MHz. Input capacitance is 5pF, requiring R′ < 3kΩ for optimal AC stability in inverting/noninverting configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 5.5V single supply - enables direct interfacing with Li-ion, 3.3V, and 5V logic domains without level shifting. |
| Gain-Bandwidth Product | 10MHz - supports closed-loop bandwidths up to ~1MHz at gain = 10, suitable for fast sensor amplification and audio preamp stages. |
| Slew Rate | 10V/µs - ensures faithful reproduction of 100kHz 2Vpp signals with <1% distortion, critical for pulse conditioning in power control loops. |
| Input Bias Current | ±50pA typical - minimizes voltage error in high-impedance source applications like thermistor or photodiode front-ends. |
| Output Swing (2kΩ) | VSS + 55mV to VDD – 55mV - preserves dynamic range in low-voltage systems where headroom is constrained. |
| Capacitive Load Drive | Stable with ≤300pF - eliminates need for isolation resistors in ADC driver or filter buffer applications with typical PCB trace and input capacitance. |
| Input Offset Voltage | ±1.5mV max over -40°C to +125°C - ensures <10µV/°C drift for precision DC-coupled measurement paths. |
Pinout & Package
MAX4491AKA-T is housed in a 5-pin SC70-5 (also referenced as SOT23-5/SC70-5) surface-mount package, measuring 2.0mm × 2.1mm × 0.9mm, optimized for space-constrained automotive and portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN+ | Noninverting input - accepts signals from VSS to VDD; used for unity-gain buffers and noninverting amplifiers. |
| 2 | VSS | Negative supply terminal - connects to ground in single-supply systems; substrate tied to VSS per chip info. |
| 3 | IN− | Inverting input - forms feedback node in inverting configurations; high-impedance CMOS input with 5pF capacitance. |
| 4 | OUT | Amplifier output - drives resistive loads down to 2kΩ and capacitive loads up to 300pF while maintaining rail-to-rail swing. |
| 5 | VDD | Positive supply input - supplies internal biasing; requires local 0.1µF ceramic decoupling for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-Rail Input/Output | Common-mode range extends to VSS and VDD; output swings within 55mV of both rails into 2kΩ - maximizes usable signal range in 3.3V systems. |
| High Slew Rate + GBW | 10V/µs slew rate paired with 10MHz GBW enables fast transient response in closed-loop current-sense amplifiers and active filters. |
| Automotive Temperature Range | Guaranteed operation from -40°C to +125°C - qualified for under-hood and ADAS sensor signal conditioning without derating. |
| Low Input Bias Current | 50pA typical - reduces offset error in high-Z sensor interfaces (e.g., pH electrodes, piezoresistive bridges) without external guarding. |
| Capacitive-Load Stability | Stable with 300pF loads - simplifies driving SAR ADC inputs or long traces without added series resistance or compensation networks. |
Applications
| High-Side Current Sensing | Low-Voltage Sensor Amplification |
|---|---|
|
Use Scenario: Monitoring battery pack or motor phase current using a shunt resistor placed between load and VDD. IC Role / Device Role / Timing Role: Configured as a noninverting difference amplifier (with external resistors) to reject common-mode voltage up to VDD while amplifying mV-level shunt drops. Use Value: Rail-to-rail input allows direct sensing at VDD potential; 55mV output swing preserves resolution when interfacing with 12-bit ADCs powered from same 3.3V rail. |
Use Scenario: Amplifying output of MEMS pressure sensor or RTD bridge operating from 3.3V supply in portable medical device. IC Role / Device Role / Timing Role: Single-supply instrumentation amplifier front-end with gain = 100, rejecting supply noise via high PSRR (100dB). Use Value: 50pA input bias current prevents loading of high-impedance sensor elements; 10MHz GBW supports 10kHz bandwidth without phase lag. |
| Audio Signal Conditioning | RF Power Amplifier Control |
|
Use Scenario: Buffering and level-shifting line-level audio from codec DAC before headphone driver in battery-powered headset. IC Role / Device Role / Timing Role: Unity-gain rail-to-rail buffer isolating DAC output and driving 32Ω headphones through AC-coupling capacitor. Use Value: 10V/µs slew rate prevents slew-induced THD at 20kHz; 55mV output swing ensures full 1.5Vpp signal delivery into 10kΩ load. |
Use Scenario: Generating precise analog bias voltage for GaN HEMT gate control in 5G base station PA modules. IC Role / Device Role / Timing Role: Precision voltage reference follower delivering stable 3.0V gate bias with fast transient recovery during PA burst mode. Use Value: 10MHz GBW and 10V/µs slew rate enable sub-100ns recovery from 100mV step disturbances; rail-to-rail output avoids clipping during thermal drift compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSV911ICT | Lower GBW (8MHz), higher input bias current (100pA), same SC70-5 package and rail-to-rail I/O. | Marginally lower bandwidth limits use in >500kHz closed-loop sensors; higher IB increases error in >1MΩ source impedances. | Preferred for cost-sensitive industrial controls where 8MHz suffices and wider temp range not required. |
| MCP6001T-E/OT | Slower slew rate (0.6V/µs), lower GBW (1MHz), but lower quiescent current (100µA vs 800µA); SOT23-5 only. | Insufficient speed for fast current sensing or audio; better suited for ultra-low-power wake-up comparators or slow sensor monitoring. | Select when power budget is <150µA and bandwidth needs are <100kHz - not a functional replacement for MAX4491AKA-T's speed specs. |
Compared with TSV911ICT and MCP6001T-E/OT, the MAX4491AKA-T uniquely combines 10MHz GBW, 10V/µs slew rate, and guaranteed -40°C to +125°C operation in SC70-5 - making it the only option among the three qualified for automotive high-speed current sensing and AEC-Q100-compliant designs.
Availability
MAX4491AKA-T is available at Aetrix Electronics and suitable for battery-powered instruments, automotive sensor signal conditioning, and portable equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4491AKA-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX4490/MAX4491/MAX4492 family was designed specifically for cost-sensitive, high-speed, rail-to-rail signal conditioning in space-constrained automotive and portable applications - emphasizing speed, precision, and robustness over wide temperature ranges.
FAQ
What is the maximum capacitive load the MAX4491AKA-T can drive without oscillation?
The MAX4491AKA-T is specified to remain unity-gain stable with capacitive loads up to 300pF, as confirmed in the Electrical Characteristics table and Typical Operating Characteristics (Figure 4). This applies across the full -40°C to +125°C temperature range and 2.7V–5.5V supply. For loads exceeding 300pF, an isolation resistor (e.g., 10Ω) is recommended per Figure 5 in the datasheet. The MAX4491AKA-T's 60° phase margin ensures clean step response even at this limit.
Does the MAX4491AKA-T support dual-supply operation?
Yes, the MAX4491AKA-T supports dual-supply operation from ±1.35V to ±2.75V, as explicitly stated in the General Description and Electrical Characteristics sections. In dual-supply mode, VDD connects to the positive rail and VSS to the negative rail. The rail-to-rail input and output stages function symmetrically, allowing full-swing signal handling centered at 0V. The MAX4491AKA-T's specifications - including input offset voltage, CMRR, and PSRR - are guaranteed over the full automotive temperature range under both single- and dual-supply conditions.
What is the input common-mode voltage range for the MAX4491AKA-T?
The MAX4491AKA-T features a true rail-to-rail input stage, with guaranteed common-mode voltage range from VSS to VDD across the full -40°C to +125°C temperature range. This is achieved via parallel N- and P-channel input pairs that seamlessly transition near VSS + 1.2V and VDD – 1.2V. The datasheet confirms this in both the General Description ("Rail-to-Rail® input") and Electrical Characteristics table (VCM min/max = VSS/VDD). This capability enables direct interfacing with sensors operating at either supply rail, such as high-side current shunts.
Is the MAX4491AKA-T pin-compatible with other devices in the MAX449x family?
No - the MAX4491AKA-T is a single-amplifier device in SC70-5 package, while the MAX4490 is also SC70-5 but has different top-mark (AAB vs AADB) and slightly different ordering suffixes; the MAX4492 is a quad in TSSOP/SO. Pin compatibility exists only within identical channel count and package variants: MAX4491AKA-T shares pinout with MAX4491AUA (µMAX-8) only on pins 1–5, but not full 8-pin mapping. The MAX4491AKA-T's SC70-5 pinout (IN+, VSS, IN−, OUT, VDD) is unique to its single-channel SC70 configuration and not interchangeable with dual or quad variants.
What is the typical supply current of the MAX4491AKA-T at 25°C and 5V supply?
The typical supply current for the MAX4491AKA-T is 800µA at TA = +25°C and VDD = 5V, as shown in the Electrical Characteristics table (IS = 0.8mA typ) and confirmed in Figure MAX4490 toc01 (Supply Current vs. Temperature). This value remains stable across supply voltages from 2.7V to 5.5V, with only minor variation (±50µA) - making the MAX4491AKA-T suitable for always-on sensor nodes where predictable current draw is essential for battery life estimation.
MAX4491AKA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Push-Pull, Rail-to-Rail
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 10 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 pA
- Voltage - Input Offset:
- 1.5 mV
- Current - Supply:
- 800µA (x2 Channels)
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX4491AKA-T FAQ
1.How can I place an order for MAX4491AKA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4491AKA-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX4491AKA-T reliable?
The price and inventory of MAX4491AKA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4491AKA-T is usually 5 days.
3.What payment methods are accepted for MAX4491AKA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4491AKA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4491AKA-T?
MAX4491AKA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4491AKA-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX4491AKA-T?
For technical support, including MAX4491AKA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4491AKA-T requirements.
6.How does Aetrix verify that MAX4491AKA-T is sourced from the original manufacturer or authorized distributors?
All MAX4491AKA-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX4491AKA-T meets industry standards.
7.What is the process for return or replacement of MAX4491AKA-T?
All MAX4491AKA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4491AKA-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX4491AKA-T part is unused and in its original packaging.
Return procedure for MAX4491AKA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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