LM393DRG3 - Dual Open-Collector Comparator | Texas Instruments
Référence : LM393DRG3 ✓ ActifLM393DRG3 Présentation
A differential comparator is an analog integrated circuit that compares two input voltages and changes its output state according to their relationship. The LM393 belongs to the comparator hierarchy within analog and linear ICs, where its purpose is to convert a small voltage difference into a logic-level indication. Each half of the device can compare a sensed voltage against a reference or against another signal, making the part useful for threshold detection, supervision, and signal conditioning.
The LM393 provides a 2 V to 36 V supply range and can operate with single supplies from 2 V to 36 V or dual supplies from ±1 V to ±18 V. Its differential input voltage range can equal the maximum-rated supply voltage, while its common-mode input range includes ground. The open-collector outputs permit wired logic, external pull-up resistors, and level translation, but require suitable pull-up components when the outputs drive CMOS or TTL loads.
The two comparators are independent, allowing one channel to monitor a supply threshold while the other performs a second sensing or switching function. Low input bias current, low input offset voltage, and rail-to-rail input characteristics support accurate comparisons over a wide operating range. These characteristics make the device useful when the input signal is close to ground or when the reference voltage must be monitored with minimal loading of the source.
Typical LM393DRG3 applications include window comparators for battery and power-supply supervision, zero-cross detection in control systems, sensor threshold conditioning, relay-driver interfaces, and general industrial logic interfaces. The open-collector architecture is especially useful when a system needs a wired-AND output or a voltage level different from the comparator supply voltage. An external pull-up resistor sets the resulting high level.
Designers should verify input common-mode limits, output pull-up values, and output-current requirements before finalizing the circuit. The open collector sinks current but does not actively source a high-level voltage, so each output requires an appropriate pull-up network unless another compatible open-collector device supplies it. Keep pull-up routing short and account for rise time when driving longer traces or high-capacitance nodes.
This page combines the LM393DRG3 operating limits, package details, verified drop-in alternatives, comparison parameters, and application guidance to support component selection and board-level implementation. The LM393DRG3 is particularly suitable when a dual, general-purpose comparator with open-collector outputs and wide supply-voltage operation is required in an 8-pin SOIC footprint.
Alternatives de remplacement direct pour LM393DRG3 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec LM393DRG3 (même facteur de forme et même empreinte) — différant par Comparator Type, Logic Compatibility.
LM393BIDR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM393BDR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM2903DR
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →LM393DR2G
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →LMV393DR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM393DRG3 Valeurs maximales et caractéristiques électriques
| Comparator Type | Differential |
| Number of Channels | 2 channels |
| Type de sortie | Open-collector |
| Single-Supply Voltage Range | 2 V to 36 V |
| Dual-Supply Voltage Range | ±1 V to ±18 V |
| Common-Mode Input Range | Includes ground |
| Differential Input Voltage Range | Equal to the maximum-rated supply voltage |
| Tested Supply Voltage | 30 V for V-device and 32 V for non-V device |
| Logic Compatibility | CMOS, MOS, and TTL |
| Boîtier | 8-pin SOIC |
| Package Width | 3.90 mm |
| Package Body Length | 0.154 inch |
| Commercial Grade | Commercial-grade application |
| Configuration de sortie | Open-collector output with external pull-up required |
Configuration des broches de LM393DRG3
| Broche 1 | OUT1 — Open-collector output of comparator 1 |
| Broche 2 | IN1- — Inverting input of comparator 1 |
| Broche 3 | IN1+ — Non-inverting input of comparator 1 |
| Broche 4 | GND — Ground connection |
| Broche 5 | IN2+ — Non-inverting input of comparator 2 |
| Broche 6 | IN2- — Inverting input of comparator 2 |
| Broche 7 | OUT2 — Open-collector output of comparator 2 |
| Broche 8 | VCC — Positive supply connection |
Applications typiques
LM393DRG3 convient pour 6 applications: Battery Voltage Window Monitoring, Power-Supply Overvoltage Detection, Sensor Threshold Conditioning, Zero-Cross Detection, Open-Collector Alarm Interface, Industrial Logic Level Translation.
Battery Voltage Window Monitoring
The LM393DRG3 supports battery supervision by using its two independent differential comparator channels to establish upper and lower voltage thresholds. Each open-collector output can pull down a common alarm line, creating a wired-AND window indication without an additional logic gate. The 2 V to 36 V supply range accommodates many single-cell, multi-cell, and industrial monitoring circuits. External reference dividers should include filtering where switching supplies create ripple. Because the outputs are open collector, one pull-up resistor can monitor both channels when a shared fault signal is acceptable, while separate pull-ups provide independent status indications.
Recommandé
Power-Supply Overvoltage Detection
The two channels of the LM393DRG3 can supervise positive and negative rails in a split-supply system or provide an overvoltage indication on a single rail. The differential inputs compare a divided feedback voltage with a reference, while the open-collector output directly drives a system fault input or drives an external relay stage. Its supply range of 2 V to 36 V supports operation from low-voltage logic rails through higher industrial monitoring voltages. Place a pull-up resistor on the fault output and keep the feedback divider close to the comparator input to reduce susceptibility to noise and switching-node coupling.
Recommandé
Sensor Threshold Conditioning
The LM393DRG3 can convert a slowly changing sensor signal into a digital threshold event by comparing that signal with a reference voltage. Its low input-bias operating characteristics help avoid loading high-impedance sensors, while the common-mode input range including ground supports sensing near the lower supply rail. The open-collector output is useful when driving an MCU input, optocoupler, relay, or indicator through a pull-up network. Designers should account for input offset and noise when the crossing point must be precise, and add hysteresis with positive feedback when chatter near the threshold would be undesirable.
Recommandé
Zero-Cross Detection
The LM393DRG3 can detect the transition of an analog waveform through zero by comparing the waveform against a ground-centered reference. In AC control systems, the comparator produces a sharp logic transition that can trigger timing, thyristor control, or event counting. Its differential inputs and open-collector output suit interfaces where a pull-up establishes the receiver's logic level. Input limiting and protection may be required when the sensed waveform can exceed the comparator's differential input limits. Keep the input trace compact, use a defined reference node, and select a pull-up that provides adequate noise margin without excessive switching current.
Recommandé
Open-Collector Alarm Interface
The open-collector output of the LM393DRG3 provides a straightforward interface to alarms, relay drivers, and older CMOS or TTL systems. The comparator can generate a fault signal by detecting a voltage outside its programmed reference range, then sink current through a pull-up network to create the active logic state. This architecture also supports wired-AND behavior when several open-collector devices share one line. Select pull-up voltage according to the receiver's requirements, observe output-current limits, and use an appropriate driver transistor when the load current exceeds the comparator's output rating.
Recommandé
Industrial Logic Level Translation
The LM393DRG3's open-collector outputs allow a system to translate between different logic levels by connecting the pull-up resistor to the destination rail. A comparator operating from one supply domain can therefore control a CMOS or TTL input in another domain without forcing the output to the comparator's own supply voltage. The 2 V to 36 V operating range supports broad industrial signal ranges. Confirm that the input thresholds, output sink current, pull-up voltage, and propagation delay suit the receiving device. This arrangement is especially useful where the destination device accepts an open-collector or pulled-up fault input.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LM393DRG3 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LM393BIDR | LM393BDR | LM2903DR | LM393DR2G | LMV393DR |
|---|---|---|---|---|---|---|
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | onsemi | Texas Instruments |
| Number of Comparators | 2 channels | 2 channels | 2 channels | 2 channels | 2 channels | 2 channels |
| Output Type | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector |
Principaux différenciateurs
- Lower input offset in the B-version alternative (vs LM393BIDR)
- Broader supply-voltage range than the low-voltage LMV alternative (vs LMV393DR)
- Commercial-grade LM393 family alignment (vs LM2903DR)
Notes de conception
Treat both LM393DRG3 outputs as open-collector outputs that require a pull-up resistor. The device sinks the active-low output current but does not actively drive a high voltage. Select the pull-up voltage for the receiving CMOS or TTL device, verify that the maximum pull-up current remains within the output limit, and ensure the resistor and trace capacitance do not create an excessively slow rising edge.
Place the comparator input traces away from switching nodes and keep the paths from the reference divider short and symmetric. If the input source has high source impedance, minimize leakage through board contamination and use guarding where appropriate. The common-mode input range includes ground, but the exact allowable input range at the selected supply voltage must still be respected to avoid incorrect comparison results.
Add intentional hysteresis when a noisy or slow-crossing input could cause repeated output transitions. Positive feedback from the output to the appropriate inverting input establishes a switching gap, but the resistor network also shifts the threshold and interacts with input offset. Recheck the actual trip points after adding hysteresis instead of assuming the original reference voltage remains unchanged.
Informations de conformité
The LM393DRG3 is identified as a commercial-grade comparator. The verified manufacturer and distributor records do not state the individual compliance fields.