MCP6491T-E/LTY - 7.5MHz Low-Bias Op Amp | Microchip
MPN: MCP6491T-E/LTY ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.8828 | $0.88 |
| 10 | $0.8828 | $8.83 |
| 100 | $0.8828 | $88.28 |
| 500 | $0.8828 | $441.40 |
| 1,000 | $0.8828 | $882.80 |
| 3,000 | $0.8828 | $2,648.40 |
MCP6491T-E/LTY Overview
An operational amplifier, or op amp, is a voltage-controlled differential amplifier used to amplify, buffer, filter, compare, or reshape analog signals. Within the broader semiconductor hierarchy, this product is an analog integrated circuit, specifically a general-purpose CMOS operational amplifier. Rail-to-rail input operation helps the amplifier accept signals near its supply rails, while rail-to-rail output operation extends usable output swing toward the rails. The low input bias current makes the MCP6491 family useful with high-impedance sources where amplifier input current can materially affect accuracy.
The MCP6491 family combines a typical 7.5 MHz gain-bandwidth product with low power consumption. According to the Microchip manufacturer page, the devices draw a typical 530 µA per amplifier, support single-supply operation from 2.4 V, and provide rail-to-rail input and output behavior. The manufacturer datasheet states that the MCP6491/MCP6492/MCP6494 family uses an advanced CMOS process and is specified over an extended temperature range from -40°C to +125°C.
The MCP6491T-E/LTY is a single-amplifier device, whereas MCP6492 and MCP6494 provide dual and quad versions respectively. Unity-gain stability supports direct use as a voltage follower, but board-level stability still depends on output capacitive load, feedback topology, operating voltage, and the surrounding source and load impedances. The low typical input bias current is particularly relevant when driving the input from sensors, photodiodes, resistive dividers, or other high-output-impedance sources.
Typical applications include low-power sensor signal conditioning, current-monitoring front ends, battery-powered instrumentation, portable measurement systems, analog filtering, and general-purpose signal buffering. The 5-pin SC-70 package supports compact layouts, but users should follow the manufacturer datasheet for land patterns, exposed-pad or lead information, and assembly guidelines.
Designers should verify supply voltage limits, input common-mode range, output swing, output-drive capability, noise, offset voltage, and load stability in the manufacturer datasheet. A bypass capacitor close to the supply pins is generally important for clean operation, while input and feedback resistors should be selected to control bias-current error and preserve the required bandwidth.
This product page consolidates the verified Microchip specifications, distributor availability information, package details, and design considerations. It is intended to support component selection and board-level planning without guessing electrical limits that are not explicitly provided in the verified source material.
Drop-in alternatives for MCP6491T-E/LTY — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MCP6491T-E/OT
✅ Drop-In📋 Reference alternative (not in catalog)
MCP6481T-E/LTY
✅ Drop-In📋 Reference alternative (not in catalog)
MCP6491T-E/LTY Maximum Ratings & Electrical Characteristics
| Product Type | Single operational amplifier |
| Supply Voltage | Single supply as low as 2.4 V |
| Input Configuration | Rail-to-rail input |
| Output Configuration | Rail-to-rail output |
| Gain Bandwidth Product | 7.5 MHz typical |
| Input Bias Current | 150 pA typical at 125°C |
| Quiescent Current | 530 µA typical per amplifier |
| Unity Gain | Stable |
| Operating Temperature Range | -40°C to +125°C |
| Process Technology | Advanced CMOS |
| Package | SC-70-5 |
| Mounting Type | Surface mount |
| Channel Count | 1 |
| Output Current | 40 mA |
| AEC-Q100 Qualification | Qualified in distributor product description; manufacturer qualification status requires datasheet confirmation |
| Automotive Application | Automotive-related listing identified in verified distributor data |
MCP6491T-E/LTY Pin Configuration
| Pin 1 | NC — Not connected; confirm exact pin function in the manufacturer datasheet |
| Pin 2 | IN- — Inverting input; confirm exact pin function in the manufacturer datasheet |
| Pin 3 | IN+ — Non-inverting input; confirm exact pin function in the manufacturer datasheet |
| Pin 4 | V- — Negative supply or ground; confirm exact pin function in the manufacturer datasheet |
| Pin 5 | V+ — Positive supply; confirm exact pin function in the manufacturer datasheet |
Typical Applications
MCP6491T-E/LTY is suitable for 6 applications: High-Impedance Sensor Signal Conditioning, Battery-Powered Instrumentation, Photodiode and Optical-Signal Readout, Portable Measurement and Buffering, Low-Power Analog Filtering, Low-Power Current Monitoring.
High-Impedance Sensor Signal Conditioning
The MCP6491T-E/LTY fits low-power sensor front ends when the sensor or electrode presents a high source impedance. Its verified 150 pA typical input bias current at 125°C limits the current-induced error that can otherwise disturb a small sensor signal. The 7.5 MHz typical gain-bandwidth product provides more bandwidth than many low-power sensor amplifiers need, while the 530 µA typical quiescent current supports battery-operated equipment. Use a non-inverting or instrumentation topology as appropriate, and verify the full input common-mode range and offset behavior before setting the gain.
Recommended
Battery-Powered Instrumentation
The MCP6491T-E/LTY is suitable for portable instrumentation powered from a low-voltage single supply. The manufacturer page identifies operation from a single supply as low as 2.4 V and a typical quiescent current of 530 µA per amplifier, which helps conserve power in continuously operating equipment. Its rail-to-rail input and output behavior supports signal paths that use much of the available supply range. Design the surrounding filter or amplifier network so that signal swing, noise, and output current remain within the datasheet limits, especially when driving an ADC input.
Recommended
Photodiode and Optical-Signal Readout
The MCP6491T-E/LTY can be used in low-level optical readout circuits where the photodiode or transimpedance network presents high impedance. The low typical input bias current helps prevent the amplifier input from loading a weak current signal, while unity-gain stability permits buffer-style configurations. The 7.5 MHz typical gain-bandwidth product can support moderate-bandwidth signal processing, but the actual useful bandwidth is governed by the feedback resistor, parasitic capacitance, photodiode capacitance, and required stability compensation. Check the manufacturer datasheet for input capacitance and output-load limits.
Recommended
Portable Measurement and Buffering
The MCP6491T-E/LTY is a practical choice for portable measurement systems needing a compact, low-power analog buffer. The 5-pin SC-70-5 package helps reduce board area, while the 7.5 MHz typical gain-bandwidth product provides adequate margin for many low-frequency sensor-conditioning paths. The device can buffer a high-impedance source before an ADC or comparator without imposing the higher input current associated with a conventional precision-input amplifier. Nevertheless, layout should keep feedback paths short and use a local supply bypass capacitor to preserve low-noise operation.
Recommended
Low-Power Analog Filtering
The MCP6491T-E/LTY can implement first-order and higher-order analog filters in compact battery-powered systems. Its typical 7.5 MHz gain-bandwidth product provides bandwidth for moderate-gain active filters, and unity-gain stability simplifies voltage-follower stages. Component tolerances and amplifier finite open-loop gain will influence filter accuracy, while input bias current and capacitance can matter with high-impedance nodes. Confirm the required gain, phase margin, capacitive-load behavior, and supply range using the manufacturer datasheet before finalizing the filter topology.
Recommended
Low-Power Current Monitoring
The MCP6491T-E/LTY is suitable for amplifying the voltage from a low-value current shunt or other current-sense network when the operating current and power budget are moderate. The rail-to-rail output can simplify conversion of a small sense voltage toward the available supply range, and the 530 µA typical quiescent current helps limit added supply demand. Choose shunt resistance so the amplifier input stays within its verified common-mode capability and the output remains within the required measurement range. Verify the full current, voltage, and thermal limits in the datasheet.
Recommended
Engineering reference data for MCP6491T-E/LTY — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MCP6491T-E/OT | MCP6481T-E/LTY |
|---|---|---|---|
| Product Type | Single operational amplifier | Single operational amplifier | Single low-input-bias operational amplifier family member |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SC-70-5 | SOT-23-5 in verified distributor result; not same package | SC-70-5 class; exact package confirmation required |
| Drop-In Qualification | Target component | Not verified as drop-in because verified package is SOT-23-5 | Candidate requires exact pin and electrical cross-check |
Key Differentiators
- Low input bias current for high-impedance analog work (vs MCP6481T-E/LTY)
- Gain-bandwidth product suitable for moderate-speed signal conditioning (vs MCP6491T-E/OT)
- Compact SC-70-5 footprint (vs MCP6491T-E/OT)
Design Notes
The verified MCP6491 family information specifies operation from a single supply as low as 2.4 V and a typical quiescent current of 530 µA per amplifier. Confirm the maximum supply voltage and output-current limits in the manufacturer datasheet before applying the part. Place a local bypass capacitor near the supply pins and keep the return path short; do not assume the typical supply-current figure covers dynamic current, output-load current, or startup transients.
The supplied verified snippets do not include the complete pinout table, input common-mode limits, offset voltage, noise, output swing, or capacitive-load limits. Do not infer these values from the SC-70-5 package or from the MCP6491 family name. Use the official datasheet for the exact MCP6491T-E/LTY orderable, especially when the source impedance is high or the output drives an ADC, sensor, or capacitive load.
SC-70-5 is a compact surface-mount package, so trace length and via placement can materially affect high-impedance designs. Keep the input node and feedback loop short, route the high-impedance input away from switching nodes and noisy grounds, and place supply decoupling close to the IC. Verify the land pattern and assembly orientation against the Microchip package drawing rather than relying only on the generic package name.
The verified 150 pA typical input bias current at 125°C is favorable for high-impedance sources, but bias-current error still depends on source resistance and temperature. Estimate the bias-current contribution using IBIAS multiplied by source impedance, and check leakage from PCB contamination and adjacent high-impedance nodes. Stable feedback design and adequate supply bypassing are especially important when the input source is slow and the required accuracy is high.
Compliance Information
A verified distributor result describes the part as automotive AEC-Q100, but RoHS, REACH, lead-free, halogen-free, and conflict-minerals status are not supplied. Confirm qualification scope and environmental declarations with Microchip documentation.
