Part Details for OPA121KM by Texas Instruments
Results Overview of OPA121KM by Texas Instruments
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OPA121KM Information
OPA121KM by Texas Instruments is an Operational Amplifier.
Operational Amplifiers are under the broader part category of Amplifier Circuits.
Amplifier circuits use external power to increase the amplitude of an input signal. They can be used to perform linear amplifications or logarithmic functions. Read more about Amplifier Circuits on our Amplifier Circuits part category page.
Part Details for OPA121KM
OPA121KM CAD Models
OPA121KM Part Data Attributes
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OPA121KM
Texas Instruments
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OPA121KM
Texas Instruments
Low Cost Precision Difet Operational Amplifier 8-TO-99
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| Pbfree Code | No | |
| Rohs Code | No | |
| Part Life Cycle Code | Obsolete | |
| Ihs Manufacturer | TEXAS INSTRUMENTS INC | |
| Part Package Code | TO-99 | |
| Package Description | HERMETIC, TO-99, 8 PIN | |
| Pin Count | 8 | |
| Reach Compliance Code | not_compliant | |
| ECCN Code | EAR99 | |
| HTS Code | 8542.33.00.01 | |
| Samacsys Manufacturer | Texas Instruments | |
| Amplifier Type | OPERATIONAL AMPLIFIER | |
| Architecture | VOLTAGE-FEEDBACK | |
| Average Bias Current-Max (IIB) | 0.000005 µA | |
| Bias Current-Max (IIB) @25C | 0.000005 µA | |
| Common-mode Reject Ratio-Nom | 104 dB | |
| Frequency Compensation | YES | |
| Input Offset Voltage-Max | 2000 µV | |
| JESD-30 Code | O-MBCY-W8 | |
| Low-Bias | YES | |
| Low-Offset | NO | |
| Neg Supply Voltage Limit-Max | -18 V | |
| Neg Supply Voltage-Nom (Vsup) | -15 V | |
| Number of Functions | 1 | |
| Number of Terminals | 8 | |
| Operating Temperature-Max | 70 °C | |
| Operating Temperature-Min | ||
| Package Body Material | METAL | |
| Package Code | TO-99 | |
| Package Equivalence Code | CAN8,.2 | |
| Package Shape | ROUND | |
| Package Style | CYLINDRICAL | |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED | |
| Qualification Status | Not Qualified | |
| Slew Rate-Nom | 32 V/us | |
| Supply Current-Max | 4.5 mA | |
| Supply Voltage Limit-Max | 18 V | |
| Supply Voltage-Nom (Vsup) | 15 V | |
| Surface Mount | NO | |
| Technology | BIPOLAR | |
| Temperature Grade | COMMERCIAL | |
| Terminal Form | WIRE | |
| Terminal Position | BOTTOM | |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED | |
| Unity Gain BW-Nom | 2000 | |
| Voltage Gain-Min | 200000 |
OPA121KM Frequently Asked Questions (FAQ)
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Texas Instruments provides a recommended layout and PCB design guide in their application note SLAA402, which includes guidelines for component placement, routing, and grounding to minimize noise and ensure optimal performance.
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The OPA121KM has a high input bias current, which can cause voltage drops across the input resistors. To mitigate this, use a low-impedance source, add a voltage follower stage, or use a current-sensing resistor to compensate for the bias current.
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The OPA121KM can drive capacitive loads up to 1nF without oscillation, but it's recommended to use a series resistor to dampen the load and prevent oscillation. For larger capacitive loads, consider using a buffer stage or a dedicated op-amp with higher capacitive drive capability.
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To ensure stability, follow the recommended layout and PCB design guidelines, use a low-ESR capacitor for power supply decoupling, and avoid using long traces or cables that can introduce parasitic inductance. Additionally, consider adding a compensation capacitor or resistor to the feedback loop to prevent oscillation.
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The OPA121KM is specified to operate up to 125°C, but its performance may degrade at high temperatures. Be aware of the device's temperature coefficient, and consider using thermal management techniques such as heat sinks or thermal interfaces to maintain a stable operating temperature.