INA117SM - High Common-Mode Difference Amplifier | TI
N.º de pieza: INA117SM ✓ ActivoINA117SM Descripción general
A difference amplifier is a specialized amplifier configuration that rejects voltage common to both inputs and amplifies the voltage difference between them. The INA117 belongs to the high-common-mode difference-amplifier category, where its common-mode rejection capability is more important than its ability to operate only within a conventional low-voltage signal range. It is used as a signal-conditioning stage between high-voltage sensing nodes and downstream measurement or control circuitry.
The principal benefits of the INA117SM are its very high common-mode input range, low nonlinearity of 0.001%, and 200 kHz bandwidth in the CSO: SHE version. Its unity-gain architecture simplifies closed-loop implementation while the integrated resistor network reduces external component count. The TO-99-8 package also provides a traditional through-hole format for instrumentation and industrial equipment where long-term availability and straightforward assembly are important.
Internally, the INA117SM consists of a monolithic precision amplifier and thin-film resistor network. The difference-amplifier topology subtracts the two input voltages and multiplies the resulting differential signal by the closed-loop gain. At unity gain, the input pair is configured so that common-mode voltage is rejected while the desired sensor differential is amplified. Its specified bandwidth supports measurement systems that need more signal bandwidth than a slow precision-only amplifier, although filtering may still be required for high-noise environments.
Typical applications include high-voltage current sensing, bridge-sensor signal conditioning, battery and power-system monitoring, industrial process measurement, and laboratory instrumentation. The device is particularly useful when a low-level differential signal is superimposed on a much larger common-mode voltage. System designers should also consider input protection, supply requirements, resistor tolerance, and the bandwidth required for the sensed waveform when assigning the amplifier.
The main design consideration is that the INA117SM does not eliminate the need for careful analog layout. Keep input and feedback traces short, place compensation or filtering components close to the device, and avoid routing high-current paths near the sensitive input nodes. Confirm the common-mode and supply limits against the exact datasheet ordering information before applying the part where the input voltage can approach a system rail.
This page consolidates the verified INA117SM product information, source links, technical distinctions, and selection guidance into one engineering reference. It also identifies same-package family options and explains where application-specific verification remains necessary, helping designers choose a replacement without assuming that different INA117 order codes are automatically interchangeable.
Alternativas directas para INA117SM — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con INA117SM (mismo factor de forma y huella) — difiere en Mounting Type, Package.
INA117BM
✅ Sustitución directa ⚠️ Especificaciones sin verificarConsulte el precio
Ver hoja de datos →INA117SMQ
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
INA117P
✅ Sustitución directa ⚠️ Especificaciones sin verificarConsulte el precio
Ver hoja de datos →INA117SM Valores máximos y características eléctricas
| Product Type | High common-mode voltage difference amplifier |
| Amplifier Count | 1 circuit |
| Gain Configuration | Unity gain |
| Maximum Nonlinearity | 0.001% |
| Bandwidth at CSO: SHE | 200 kHz |
| Bandwidth at CSO: TID | 500 kHz |
| Operating Temperature Range for Plastic Packages | -40°C to 85°C |
| Operating Temperature Range for INA117SM | -55°C to 125°C |
| Encapsulado | TO-99-8 |
| Recuento de pines | 8 pins |
| Tipo de montaje | Through-hole |
| Integrated Resistor Network | Thin-film resistor network |
| Signal Input | Differential input |
Guía de configuración de pines de INA117SM to-99-8
Configuración de pines para INA117SM (encapsulado to-99-8). Este componente analógico presenta pines de entrada, salida y alimentación. Consulte la hoja de datos del fabricante para conocer las configuraciones de los pines de ajuste de offset, compensación y habilitación. Ideal para circuitos de acondicionamiento de señal y amplificadores.
No hay datos detallados de patillaje disponibles para INA117SM.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
INA117SM es adecuado para 6 aplicacións: High-Voltage Current Sensing, Bridge-Sensor Signal Conditioning, Battery and Power-System Monitoring, Industrial Process Measurement, Laboratory Instrumentation, Instrumentation and Test Equipment.
High-Voltage Current Sensing
The INA117SM fits current-sense circuits where a small differential voltage appears across a shunt while the shunt common-mode voltage is much higher. Its 0.001% maximum nonlinearity supports accurate conversion of the sensed voltage into an output proportional to the shunt differential. The 200 kHz bandwidth for the CSO: SHE version also permits measurement of current transients beyond very slow DC. Place the amplifier across the shunt, keep the input loop compact, and provide suitable input protection when the common-mode voltage can approach a rail.
Recomendado
Bridge-Sensor Signal Conditioning
The INA117SM is suitable for bridge or other differential sensors whose output includes a substantial common-mode component. Its unity-gain difference-amplifier architecture rejects the common signal and presents a conditioned differential output to a controller or converter. The specified nonlinearity of 0.001% is valuable when preserving sensor scale accuracy, while the 200 kHz CSO: SHE bandwidth supports moderately fast measurement loops. Input filtering and sensor-specific excitation settling should be evaluated so that bandwidth and noise do not compromise the bridge output.
Recomendado
Battery and Power-System Monitoring
INA117SM can amplify a small voltage-difference measurement taken across a battery, power bus, or protection element while rejecting a high common-mode voltage. Its 0.001% maximum nonlinearity supports accurate supervisory and energy-management measurements, and the extended -55°C to 125°C range suits demanding industrial environments. The circuit must remain within the device's specified input and supply limits, and the input network should include protection appropriate for the bus voltage and fault conditions.
Recomendado
Industrial Process Measurement
The INA117SM is appropriate for process-control front ends that measure small differential sensor signals riding on larger industrial common-mode voltages. Its integrated precision amplifier and thin-film resistor network reduce the number of external precision components, while unity gain simplifies amplifier configuration. The 200 kHz bandwidth for the CSO: SHE version is useful for process loops that require reasonable dynamic response. Use short, shielded signal routing, verify the exact common-mode limits, and consider input filtering to reject high-frequency interference.
Recomendado
Laboratory Instrumentation
The INA117SM can serve as the input stage of laboratory instruments that measure weak differential voltages with substantial common-mode content. Its low 0.001% nonlinearity helps preserve measurement accuracy, and its 200 kHz CSO: SHE bandwidth is adequate for many general-purpose signal sources and measurement chains. The TO-99-8 through-hole package supports traditional instrument construction and repair practices. For precision bench equipment, check noise, offset, drift, supply requirements, and grounding before finalizing the signal path.
Recomendado
Instrumentation and Test Equipment
The INA117SM supports instrumentation amplifier front ends that must recover a low-level differential input from a high-voltage common-mode environment. Its thin-film resistor network and precision op-amp architecture provide integrated differential sensing, while the 200 kHz bandwidth accommodates many general-purpose test signals. The same-package INA117 order codes provide potential upgrade paths when grade or qualification requirements differ. Board-level design should include a low-noise supply, grounding that avoids shunt currents, and protection against accidental overvoltage.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para INA117SM — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | INA117BM | INA117SMQ | INA117P |
|---|---|---|---|---|
| Product Type | High common-mode voltage difference amplifier | High common-mode voltage difference amplifier | Qualified high common-mode voltage difference amplifier | High common-mode voltage difference amplifier |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | TO-99-8 | TO-99-8 - same | TO-99-8 - same | TO-99-8 - same |
| Pin Count | 8 pins | 8 pins | 8 pins | 8 pins |
| Gain Configuration | Unity gain | Unity gain | Unity gain | Unity gain |
Diferenciadores clave
- Extended-temperature TO-99-8 option (frente a INA117AM)
- Low signal-chain nonlinearity (frente a INA117BM)
- Qualified same-package family option (frente a INA117SMQ)
Notas de diseño
Route the two INA117SM inputs as a closely matched, short pair from the sensing source, with continuous grounding under the differential path. Keep the input loop small and avoid switching-power nodes, high-current returns, and isolation boundaries. Because the device measures a small difference between two potentially large voltages, even a few millivolts of parasitic conversion in the input network can become a meaningful measurement error.
Do not assume that the family-level bandwidth applies to every die process. The manufacturer lists 200 kHz for the CSO: SHE version and 500 kHz for the CSO: TID version. Confirm the process marking and ordering information for the INA117SM before sizing filters or interpreting dynamic response. Likewise, verify the exact common-mode, supply, input-current, and temperature limits from the manufacturer datasheet.
Keep feedback and gain-setting components close to the device and use a stable, low-impedance reference for the noninverting input. Treat the common-mode input network as a precision resistor network: resistor drift, mismatch, and leakage directly affect differential accuracy. If additional input filtering is required, account for the resulting differential phase shift and verify that it does not impair the intended measurement bandwidth.
Decouple the supply pins close to the device and provide a return path that does not share current with sensitive input measurement nodes. Before energizing a high-voltage circuit, confirm the absolute maximum input and supply ratings, including transients. Add clamp or series impedance where necessary so that a fault cannot exceed the limits specified for the exact order code.
Información de cumplimiento
Compliance information was not stated for the INA117SM on the referenced product page and search result. Use the manufacturer product page, current material-declaration records, or a project-specific quality assessment for confirmation.
