LM2903VN - Dual 36V Open-Collector Comparator | onsemi
N.º de pieza: LM2903VN ✓ ActivoLM2903VN Descripción general
A voltage comparator is an analog integrated circuit that compares an input voltage with a reference voltage and changes its output state when the relationship between the voltages changes. Within the broader semiconductor hierarchy, a comparator belongs to the interface and signal-conditioning IC family. It converts a small voltage relationship into a logic-level indication that can be used by control systems, protection circuits, sensing equipment, and industrial automation systems.
The LM2903VN is identified as a low-offset-voltage, low-power dual comparator. Its open-collector output architecture requires an external pull-up resistor when the output is used as a wired logic signal. This arrangement permits several open-collector outputs to share a common bus when their pull-up network is designed correctly. The rail-to-rail input designation indicates operation across the full input range covered by the device, while the 2 V to 36 V supply rating supports operation from low-voltage logic systems through higher-voltage industrial applications.
Automotive qualification and the -40°C to +125°C ambient-temperature range make the LM2903VN relevant to temperature-tolerant control and monitoring circuits. The dual configuration can reduce component count when a design requires independent positive and negative threshold decisions, two sensor-limit channels, or complementary logic outputs. Because the two comparators are independent, they can also be used with different input networks, reference voltages, and output pull-ups within the ratings of the device.
Typical design roles include supply sequencing, overvoltage indication, sensor-threshold detection, window monitoring, and general digital control. The 8-pin PDIP package favors through-hole assembly and conventional prototyping. PCB layout should keep input and feedback traces short, place the input bypass capacitor close to the supply pins, and route high-current or switching-node copper away from the comparator inputs to reduce false transitions.
This page combines the manufacturer-device identification, package and operating information with engineering guidance for threshold design, open-collector interfacing, automotive use, and PCB implementation. It also provides comparison and replacement guidance intended to help engineers evaluate board-level alternatives without overlooking supply-voltage, common-mode, output-stage, and package differences.
Alternativas directas para LM2903VN — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
No hay alternativas directas disponibles para este producto.
Solicitar alternativasLM2903VN Valores máximos y características eléctricas
| Comparator Type | Dual general-purpose voltage comparator |
| Number of Comparators | 2 |
| Supply Voltage Range | 2 V to 36 V |
| Common-Mode Input | Rail-to-rail |
| Tipo de salida | Open-collector |
| Encapsulado | 8-pin PDIP |
| Tipo de montaje | Through-hole |
| Operating Ambient Temperature | -40°C to +125°C |
| Automotive Qualification | Qualified |
| Input Offset Voltage | Low offset voltage |
| Power Class | Low power |
| Supply Configuration | Single or split supply |
| Comparator Independence | 2 independent channels |
Guía de configuración de pines de LM2903VN 8-pin pdip
Configuración de pines para LM2903VN (encapsulado 8-pin pdip). 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 LM2903VN.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
LM2903VN es adecuado para 6 aplicacións: Industrial Control Threshold Detection, Automotive Monitoring and Protection, Power-Supply Overvoltage Indication, Sensor Signal Thresholding, Dual-Level Digital Logic Interface, General-Purpose Dual Comparator Module.
Industrial Control Threshold Detection
The LM2903VN fits industrial control circuits that must compare a divided process signal with a reference voltage. Its two independent comparator channels can monitor separate limits, while the 2 V to 36 V supply range supports operation across low-voltage logic and higher-voltage industrial control systems. Rail-to-rail input behavior is useful when the sensed signal approaches the available supply range. The open-collector output can drive a control input or fault signal through an appropriate pull-up resistor. Design the reference network and input filters for the required threshold accuracy, and keep sensing traces away from switching nodes.
Automotive Monitoring and Protection
The LM2903VN is suitable for automotive threshold-monitoring functions because it is qualified for automotive applications and specified from -40°C to +125°C. Two independent channels can evaluate separate vehicle signals, such as a divided supply rail and an external sensor signal, without using two separate comparator packages. Its open-collector outputs support wired fault indications when the required pull-up network is included. System designers should still verify transient protection, electromagnetic compatibility, diagnostic requirements, and production traceability against the complete automotive specification before releasing the design.
Power-Supply Overvoltage Indication
The LM2903VN can implement an overvoltage or supply-window indication function by comparing a resistor-divided output with an external reference. Its 2 V to 36 V operating range accommodates many industrial and automotive supply architectures, and rail-to-rail inputs reduce restrictions when the monitored voltage is near a supply rail. One comparator can detect an upper limit while the second detects a lower limit. Account for comparator offset, reference tolerance, and resistor error when setting the threshold. An open-collector fault output with an external pull-up provides a simple interface to a controller or system-fault indicator.
Sensor Signal Thresholding
The LM2903VN is appropriate for conditioning a sensor signal that must be converted into a logic indication at a defined threshold. A resistive divider can scale the sensor voltage into the comparator input range, while the second channel can monitor a complementary limit or provide an independent alarm. The rail-to-rail input characteristic supports low-voltage sensing systems, and the -40°C to +125°C ambient rating is useful in temperature-varied environments. Add input filtering where sensor noise could cause repeated output transitions, and select the external pull-up resistor to obtain the required logic rise time.
Dual-Level Digital Logic Interface
The LM2903VN can convert two analog relationships into open-collector logic signals for digital control. Because the channels are independent, each input network, reference, and pull-up can be optimized separately, allowing one channel to detect a rising condition and the other a falling condition. The low-power dual-comparator configuration reduces package count in logic interfaces while retaining a through-hole 8-pin PDIP format. For shared-bus operation, verify that only one open-collector output can assert low at a time and select the pull-up value for the intended rise time and sink-current requirement.
General-Purpose Dual Comparator Module
The LM2903VN works as a general-purpose building block for educational, prototyping, and control modules requiring two threshold decisions. Its low-offset-voltage, low-power dual-comparator architecture supports single-supply or split-supply operation, while the open-collector outputs simplify interface to discrete transistors, relay drivers, and wired logic. The 8-pin PDIP package is convenient for breadboards and through-hole prototypes. A practical design should include supply decoupling, defined input bias paths, a pull-up resistor at each output, and test points that allow the reference and comparator states to be checked independently.
Datos de referencia de ingeniería para LM2903VN — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Notas de diseño
Treat the LM2903VN as a 2 V to 36 V device and maintain adequate input headroom on every supply rail. Decouple the supply pins close to the package with a local bypass capacitor and place a bulk capacitor where the board’s power distribution requires it. Because an open-collector output does not source current, every output that must reach a valid high state requires its own pull-up path.
Keep the non-inverting and inverting inputs away from switching-node copper, relay-driver traces, and the open-collector return paths. Route these inputs as short, guarded traces and place threshold-setting resistors close to the associated input pins. Place the supply bypass capacitor directly between the supply and ground pins to reduce supply disturbance during comparator transitions.
Do not operate the open-collector output without a pull-up resistor. Use the manufacturer pin-description table to preserve channel assignments and package orientation, and verify that pull-up voltage remains within the output-pin limits. Account for input offset voltage and reference tolerances when defining a precision switching threshold, particularly in automotive systems where temperature variation affects analog behavior.
Información de cumplimiento
The device is identified as qualified for automotive use, but no specific AEC-Q100 qualification document or environmental-compliance declaration was identified.