LM393DMR2G - Dual Open-Collector Comparator | onsemi
N.º da peça: LM393DMR2G ✓ AtivoLM393DMR2G Visão geral
A voltage comparator is an analog integrated circuit that compares two input voltages and changes its output state when one input exceeds the other. The LM393 belongs to the comparator hierarchy within analog interface and signal-conditioning ICs. Its two independent channels can compare sensor outputs, control thresholds, supervise analog signals, or translate small voltage differences into logic-level events. Open-collector outputs allow the two channels to share a pull-up resistor when wired-OR operation is useful.
The principal features include two independent comparator channels, an open-collector output stage, rail-to-rail common-mode input capability, and operation from 2 V to 36 V. The low input offset voltage helps establish decision thresholds accurately when the compared signals differ only by a few millivolts. Its wide supply range also permits use in both low-voltage embedded systems and higher-voltage industrial control environments when the input and output levels are constrained appropriately.
The LM393DMR2G is identified as an active part and is packaged in the compact 8-MSOP format. The suffix R2G identifies the onsemi ordering configuration. Its open-collector outputs require external pull-up resistors to establish a high output level. Because the output transistor can sink current but cannot actively source a high-level voltage, output rise time depends on the pull-up resistance and total output capacitance rather than on the comparator alone.
Typical applications include battery threshold detection, industrial sensor interfaces, overvoltage and undervoltage protection, window comparators for two-sided limits, and logic-level translation using an external pull-up. In a two-threshold circuit, one channel can compare an input against an upper reference while the other compares it against a lower reference, allowing an external logic function to identify whether the signal is inside or outside the permitted range.
Designers should choose pull-up resistor values carefully, account for the open-collector output's rise and fall behavior, and verify input common-mode limits at every supply voltage. Because the comparator is not a rail-to-rail output device, the pull-up supply defines the high output level and must match the receiving logic system. Decoupling capacitors should be placed close to the supply and ground pins to limit supply disturbance caused by output switching.
This product page combines the exact LM393DMR2G electrical identity, package information, lifecycle and compliance attributes, verified sourcing URLs, pin assignments, application engineering guidance, and a strict assessment of drop-in replacement availability. The replacement assessment distinguishes electrically similar LM393 devices from substitutes that require a different physical footprint.
Alternativas drop-in para LM393DMR2G — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com LM393DMR2G (mesmo formato e footprint) — diferindo em Comparator Type, Package.
Nenhuma alternativa drop-in disponível para este produto.
Solicitar alternativasLM393DMR2G Classificações máximas e características elétricas
| Comparator Type | Dual, independent precision voltage comparator |
| Number of Channels | 2 channels |
| Supply Voltage Range | 2 V to 36 V |
| Input Offset Voltage | As low as 2.0 mV |
| Input Common-Mode Range | Rail-to-rail |
| Tipo de saída | Open collector |
| Supply Configuration | Single or split supply |
| Encapsulamento | 8-MSOP |
| Tipo de montagem | Surface mount |
| Temperature Grade | Commercial |
| Application Category | Industrial and automotive |
| MSL | 1, unlimited |
| RoHS Compliance | RoHS3 compliant |
| REACH Status | Unaffected |
Configuração de pinos do LM393DMR2G
| Pino 1 | OUT1 — Comparator 1 open-collector output |
| Pino 2 | IN1- — Comparator 1 inverting input |
| Pino 3 | IN1+ — Comparator 1 non-inverting input |
| Pino 4 | GND — Ground connection |
| Pino 5 | IN2+ — Comparator 2 non-inverting input |
| Pino 6 | IN2- — Comparator 2 inverting input |
| Pino 7 | OUT2 — Comparator 2 open-collector output |
| Pino 8 | VCC — Positive supply connection |
Aplicações típicas
LM393DMR2G é adequado para 6 aplicaçãos: Industrial Sensor Threshold Detection, Battery Overvoltage and Undervoltage Protection, Two-Limit Window Comparator, Overcurrent and Power-Good Monitoring, Automotive Electrical-System Supervision, Logic-Level Translation Interface.
Industrial Sensor Threshold Detection
The LM393DMR2G is appropriate for comparing a conditioned sensor signal with an adjustable reference because its two independent channels, rail-to-rail common-mode range, and input offset voltage as low as 2.0 mV support precise threshold decisions. Place one channel across the sensor signal and reference and use its open-collector output to drive a relay, alarm, or digital input stage. The 2 V to 36 V supply capability accommodates common industrial control rails. An external pull-up defines the logic-high voltage, while resistor selection controls output rise time and switching current. Protection may still be required if sensor wiring is exposed to transients or exceeds the device's absolute maximum ratings.
Battery Overvoltage and Undervoltage Protection
The LM393DMR2G can implement separate upper and lower battery-voltage limits by using one comparator for overvoltage detection and the other for undervoltage detection. Its low-offset input performance helps distinguish the measured pack voltage from carefully chosen reference nodes, while the 2 V to 36 V supply range covers many single-cell, multi-cell, and industrial battery-monitor architectures. Each open-collector output can pull down a system alarm line and share a pull-up when wired-OR logic is desired. Designers should account for battery chemistry, tolerance of the divider and reference, and the voltage margin between normal operation and the selected trip points.
Two-Limit Window Comparator
A dual comparator provides a practical window-comparator arrangement for determining whether an analog voltage remains between a lower and an upper limit. With the LM393DMR2G, one channel can compare the monitored signal against a lower reference and the other against an upper reference, creating two independently reported conditions. The rail-to-rail common-mode range is useful when the signal approaches a supply rail, and the 2.0 mV offset specification can improve threshold repeatability. Because both outputs are open collector, their logic states can be combined with suitable pull-up and gate circuitry. Reference accuracy, resistor tolerance, input bias effects, and output delay should be evaluated together for precision limits.
Overcurrent and Power-Good Monitoring
The LM393DMR2G is suitable for monitoring a shunt-derived voltage and generating an open-collector fault signal when current crosses a defined threshold. A second channel can supervise a power-good or enable condition, allowing a compact controller to react to both fault types. The device's wide 2 V to 36 V operating supply and low offset voltage support threshold circuits operating across many system rails, although the compared signals must remain within the input common-mode range. Select the shunt and divider values carefully because comparator offset, input bias current, and reference tolerance directly shift the trip point. The external pull-up should use a logic-compatible rail.
Automotive Electrical-System Supervision
The LM393DMR2G is identified for automotive and industrial applications and can supervise vehicle electrical signals when the board design includes appropriate automotive qualification and protection. One comparator may detect an upper rail excursion while another detects a lower excursion, with the open-collector outputs feeding a controller or warning circuit. The 2 V to 36 V supply range is useful for low-voltage vehicle systems, and the rail-to-rail common-mode range supports direct sensing near supply limits. AEC-Q100 qualification is not confirmed for this exact ordering code, so automotive production use requires an explicit qualification review. Transient suppression, grounding, and pull-up selection remain essential.
Logic-Level Translation Interface
The LM393DMR2G can operate as a simple logic-level translation element when its open-collector output drives a pull-up connected to the destination logic rail. The comparator determines whether the input is above or below a reference, allowing a higher-voltage domain to indicate the state of a lower-voltage signal. Its open-collector output avoids actively driving the destination rail high, which is useful when interfacing with another open-collector device. The 2 V to 36 V operating range and low offset voltage support threshold-based designs, but input and output voltage limits must be respected. Pull-up resistance, input capacitance, and required propagation delay should be considered before using this arrangement for high-speed buses.
Dados de referência de engenharia para LM393DMR2G — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto |
|---|---|
| Brand | onsemi |
| Package | 8-MSOP |
| Comparator Channels | 2 independent channels |
| Supply Voltage Range | 2 V to 36 V |
| Input Offset Voltage | As low as 2.0 mV |
| Input Common-Mode Range | Rail-to-rail |
| Output Type | Open collector |
| Supply Configuration | Single or split supply |
| Lifecycle Status | Active |
| RoHS Status | RoHS3 compliant |
Notas de projeto
Route the comparator inputs away from the open-collector outputs and external pull-up networks to reduce coupling from output switching edges. Keep the two input traces short, use a continuous ground reference, and place the supply bypass capacitor close to pin 8 with a short return to pin 4. The 8-MSOP footprint provides limited lead spacing, so input and output assignments should be reviewed against the datasheet pin-description table before routing.
Do not treat the open-collector output as a push-pull logic output. Each output requires a pull-up resistor to the logic rail, and that rail must not exceed the device's output and absolute-maximum limits. Also avoid assuming that a generic SOIC-8 or TSSOP-8 LM393 is mechanically interchangeable with the 8-MSOP LM393DMR2G; compare land patterns, package dimensions, and pin numbering before approving a substitute.
Estimate the pull-up dissipation before selecting a resistor. The estimated current in a low output state is I_PULLUP = (V_PULLUP − V_OL) / R_PULLUP, using the chosen pull-up voltage, output-low voltage, and resistance. Compare that current with the comparator's output-sink rating. A larger resistance reduces dissipation but can slow the rising edge when the output node has capacitance, so verify the resulting timing in the intended circuit.
Informações de conformidade
The component is identified as RoHS3 compliant and REACH unaffected, with MSL 1 (unlimited). AEC-Q100, lead-free, halogen-free, and conflict-minerals status are not stated for the exact ordering code.
