LM293QT - Dual Low-Power Wide-Supply Comparator | STMicroelectronics
N.º de pieza: LM293QT ✓ ActivoLM293QT Descripción general
An analog comparator is an integrated circuit that evaluates two input voltages and changes its output state when the voltage at the non-inverting input becomes higher than the voltage at the inverting input. The LM293 family belongs to the comparator and linear IC hierarchy, where each independent channel compares its differential input while operating from a common supply. This makes the device useful between sensors and digital control systems, where a small voltage difference must be converted into a logic-compatible indication.
The principal electrical characteristics include a 2 V to 36 V single-supply range, operation from split supplies of plus or minus 1 V to plus or minus 18 V, and very low supply current of approximately 0.45 mA. The comparator channels feature low input bias current of approximately 20 nA. The open-collector output stage allows the output to be pulled up to an external supply and enables wired-AND behavior when multiple comparator outputs are connected. The output type is suitable for interfacing with open-drain or open-collector digital devices.
The LM293QT provides two independent channels in a compact 8-UFDFN package. The wide supply range allows operation from low-voltage systems through higher industrial rails, while the low supply current supports battery-operated and always-on equipment. The two channels can be used for independent threshold decisions, window monitoring, or complementary comparisons. Open-collector outputs require an external pull-up resistor when the output must rise to a defined logic-high voltage.
Typical applications include industrial sensor interfaces, battery monitoring, power-supply sequencing, overvoltage and undervoltage detection, temperature-controller signal conditioning, and embedded threshold logic. Because the input common-mode range can include ground, the LM293QT is particularly useful in systems where the signal being monitored is close to the negative supply rail.
When laying out a design, preserve the exposed-pad and package thermal requirements of the 8-UFDFN package. Route the comparator inputs away from switching nodes and high-current output paths, and place the input and output components close to their associated pins. Choose the external pull-up voltage and resistor to match the receiving logic, and verify that the output sink current remains within the device limits for the selected pull-up network.
Alternativas directas para LM293QT — 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 LM293QT (mismo factor de forma y huella) — difiere en Input Common-Mode Range, Output Type, Package.
LM393QT
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Ver hoja de datos →LM293QT Valores máximos y características eléctricas
| Comparator Type | General-purpose dual comparator |
| Number of Channels | 2 channels |
| Supply Voltage Range, Single Supply | 2 V to 36 V |
| Supply Voltage Range, Split Supply | +/-1 V to +/-18 V |
| Tipo de salida | Open-collector, open-drain |
| Corriente de alimentación | 0.45 mA |
| Input Bias Current | 20 nA |
| Input Common-Mode Range | Includes ground |
| Encapsulado | 8-UFDFN, 2 x 2 mm |
| Tipo de montaje | Surface mount |
| Channel Independence | 2 independent channels |
| Output Pull-Up Requirement | External pull-up resistor required |
Guía de configuración de pines de LM293QT 8-ufdfn, 2 x 2 mm
Configuración de pines para LM293QT (encapsulado 8-ufdfn, 2 x 2 mm). 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 LM293QT.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
LM293QT es adecuado para 6 aplicacións: Industrial Voltage Monitoring, Battery-Powered Sensor Interface, Overvoltage and Undervoltage Protection, Power-Supply Sequencing, Temperature-Control Signal Conditioning, Embedded Logic and Level Detection.
Industrial Voltage Monitoring
The LM293QT fits industrial voltage-monitoring designs that need two independent threshold decisions in a compact footprint. Its two channels can separately detect overvoltage and undervoltage conditions, while the 2 V to 36 V single-supply range supports a broad range of system rails. The approximately 0.45 mA supply current is useful in continuously powered monitoring equipment, and the open-collector outputs can directly drive alarm, interlock, or power-sequencing lines through external pull-up resistors. The designer should still verify the final operating-temperature range, input absolute maximum ratings, and output sink-current limits in the manufacturer datasheet.
Recomendado
Battery-Powered Sensor Interface
For battery-powered sensor interfaces, the LM293QT provides two low-power comparison channels for converting slowly changing sensor voltages into logic states. Its input bias current of approximately 20 nA limits the error introduced by high-impedance dividers or sensor networks, while the low comparator supply current helps preserve battery capacity. The input common-mode range including ground makes it practical for detecting signals close to the negative rail. Use a suitable pull-up resistor and account for its continuous current when calculating standby consumption.
Recomendado
Overvoltage and Undervoltage Protection
The LM293QT is suitable for two-level supply protection using one comparator for an upper threshold and the other for a lower threshold. Divider networks can scale a higher system voltage into the comparator input range, while open-collector outputs can pull down a shutdown or load-control signal. This arrangement is useful in industrial and instrumentation systems where a fault must disable downstream circuitry. Select resistor values to keep input currents small, include hysteresis where required to prevent repeated switching, and verify the operating limits against the manufacturer datasheet.
Recomendado
Power-Supply Sequencing
The two independent LM293QT channels can support basic power-supply sequencing by comparing different rail voltages against references and producing open-collector status signals. The device's wide single-supply range allows it to monitor rails within a broad operating range, and the compact 8-UFDFN package helps keep the control section small. External pull-up resistors define the logic-high level for each status output. For production sequencing systems, confirm input offset voltage, temperature behavior, output timing, and all absolute maximum ratings before relying on the comparator for safety-critical sequencing.
Recomendado
Temperature-Control Signal Conditioning
In temperature-control equipment, the LM293QT can compare a temperature-sensor signal with set-point thresholds and generate a control request for a heater, fan, or alarm. Using two channels allows independent high and low set points, while the low input bias current is advantageous when the sensor is connected through resistive networks. The open-collector output can drive a transistor, relay driver, or digital control input when paired with an appropriate pull-up. Add input filtering and output hysteresis to avoid noise-induced chatter around the threshold.
Recomendado
Embedded Logic and Level Detection
The LM293QT can be used as embedded threshold logic in control boards, test fixtures, and signal-conditioning modules. Each channel compares an analog input with another voltage and produces an open-collector indication that can be pulled up to the local logic voltage. The 2 mm x 2 mm 8-UFDFN package helps conserve board area in compact industrial and embedded systems. When routing the inputs, keep them away from switching-node edges, use short traces, and place pull-up resistors close to the receiving logic to obtain predictable rise times.
Recomendado
Datos de referencia de ingeniería para LM293QT — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LM393QT |
|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics |
| Package | 8-UFDFN (2 x 2 mm) | 8-UFDFN (2 x 2 mm), family-related package |
| Comparator Type | General-purpose dual comparator | Dual comparator |
| Number of Channels | 2 | 2 |
Diferenciadores clave
- Wide single-supply operating range (frente a LM393QT)
- Low-power dual-channel implementation (frente a LM393QT)
- Compact surface-mount footprint (frente a LM393QT)
Notas de diseño
Use the LM293QT manufacturer pin-description table and package drawing to assign the 8-UFDFN land pattern. Keep the comparator input traces short and route them away from power inductors, switching-node copper, and high-current output paths. Place the external pull-up resistor close to the receiving logic input, and use a solid ground connection for the exposed-pad and supply-return structure required by the package.
Do not treat the open-collector output as a push-pull logic output. Install a pull-up resistor on each output that must reach a valid logic-high level, and verify that the resistor value allows the LM293QT to sink the required current while keeping the receiver's high-level input current within its limits. For threshold switching, add hysteresis or filtering to prevent output chatter caused by input noise.
Budget the comparator supply current together with the current consumed by each pull-up network. For a pull-up resistor connected to a voltage VPU, the pull-up contribution is approximately VPU divided by the resistor value. Check the resulting total against the battery or low-power supply budget, and confirm that the selected operating voltage and input levels remain inside the manufacturer absolute maximum ratings.
Información de cumplimiento
The verified product listings identify the LM293QT as an STMicroelectronics comparator, but they do not state the individual RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is not applicable to the general-purpose LM293QT ordering code.
