LM219J - High-Speed Dual Comparator | Texas Instruments
Référence : LM219J ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $15.65 | $15,65 |
| 10 | $15.65 | $156,50 |
| 100 | $15.65 | $1 565,00 |
| 500 | $15.65 | $7 825,00 |
| 1 000 | $15.65 | $15 650,00 |
LM219J Présentation
A comparator is an analog-to-digital decision component that compares two input voltages and produces a logic-oriented output indicating which input is higher. In the broader electronics hierarchy, the LM219J belongs to the comparator and linear IC families, alongside logic-compatible interface and signal-conditioning devices. Its two channels can be used independently for threshold detection, zero-crossing detection, pulse shaping, or basic control loops.
The verified LM219J information identifies a dual general-purpose comparator, a 5 V to 30 V supply range, and DTL, open-collector, open-emitter, RTL, and TTL output compatibility. These characteristics make it useful in legacy industrial logic, control, test, and instrumentation systems where existing designs depend on high-voltage-compatible inputs and established logic interfaces. The dual-channel configuration also reduces the component count when two comparison functions are required.
The LM219J family is described as a precision high-speed dual comparator fabricated on a single monolithic chip. The verified data does not provide a full electrical parameter table, propagation-delay value, input-offset specification, input-current limit, or output-current rating, so those values are not inferred here. Applications should be checked against the manufacturer datasheet before relying on timing, noise, input common-mode range, or output-drive limits.
Typical uses include industrial control logic, digital threshold detection, pulse and signal monitoring, legacy computer interfaces, process-control instrumentation, and embedded systems using open-collector or TTL-compatible signaling. The 14-CDIP package favors through-hole legacy boards and repair or modernization projects rather than compact surface-mount assemblies. When upgrading a PCB, confirm pin numbering, supply polarity, input polarity, output pull-up requirements, and timing margins before substitution.
For robust implementation, place the device close to the circuitry whose signals are being compared, maintain the required supply voltage, and observe the output-load requirements of the selected interface. Open-collector outputs generally need an external pull-up network, while TTL-compatible systems may use active drive. PCB layout should minimize long comparator input traces and provide adequate bypassing around the supply pins.
This page combines verified distributor and cross-reference information with practical engineering guidance. It explicitly separates available facts from missing parameters so that procurement, replacement, and high-speed circuit decisions can be checked against the authoritative Texas Instruments documentation before design release.
Alternatives de remplacement direct pour LM219J — 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 LM219J (même facteur de forme et même empreinte) — différant par Logic Compatibility, Output Type, Package, Product Type.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
LM219N
✅ Remplacement direct✓ En stock
Contactez-nous pour le prix
Voir la fiche technique →LM119D
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM219J Valeurs maximales et caractéristiques électriques
| Product Type | General-purpose comparator |
| Number of Elements | 2 |
| Number of Channels | 2 |
| Supply Voltage Range | 5 V to 30 V |
| Alternate Supply Description | ±2.5 V to ±15 V |
| Type de sortie | DTL, open-collector, open-emitter, RTL, TTL |
| Boîtier | 14-CDIP |
| Package Body Width | 0.300 in |
| Package Width | 7.62 mm |
| Type de montage | Through-hole |
| Comparator Class | Precision high-speed dual comparator |
| Monolithic Construction | Single monolithic chip |
| Logic Compatibility | DTL, open-collector, open-emitter, RTL, TTL |
Guide de configuration des broches du LM219J 7.62 mm
Configuration des broches du LM219J (boîtier 7.62 mm). Ce composant analogique comporte des broches d'entrée, de sortie et d'alimentation. Consultez la fiche technique du fabricant pour les configurations des broches d'annulation d'offset, de compensation et d'activation. Idéal pour le conditionnement de signaux et les circuits amplificateurs.
Aucune donnée de brochage détaillée disponible pour LM219J.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
LM219J convient pour 7 applications: Industrial Threshold Detection, Pulse and Zero-Crossing Detection, Legacy TTL and DTL Control, Process-Control Instrumentation, Legacy Test and Measurement, Embedded Control and Interfacing, Power and Battery Monitoring.
Industrial Threshold Detection
LM219J fits legacy industrial threshold-detection circuits that compare a process or control signal against a reference and produce a logic-compatible decision. Its verified 5 V to 30 V supply range is useful when the surrounding control electronics operates above a basic 5 V rail, while the dual architecture permits two independent limits in one package. Because the supplied sources classify the part as high speed but omit numeric delay and common-mode data, the designer should use the official datasheet to verify sensing accuracy, input range, output loading, and timing before deployment. A 14-CDIP package also supports repairable and through-hole industrial boards.
Recommandé
Pulse and Zero-Crossing Detection
LM219J is a candidate for pulse-width or zero-crossing detection in legacy signal-monitoring circuits because the verified family description identifies it as a precision high-speed dual comparator. The two channels can monitor either edge of a bipolar waveform or implement upper and lower threshold decisions. The available sources do not provide a propagation-delay number, so input filtering and guard time must be based on the manufacturer timing data rather than an assumed delay. Open-collector, TTL, and other listed output compatibility can help bridge to older digital control stages.
Recommandé
Legacy TTL and DTL Control
The LM219J output interface is verified as compatible with DTL, open-collector, open-emitter, RTL, and TTL conventions, making it relevant to older digital control cards and laboratory equipment. A comparator decision can drive a pull-up or open-collector interface without changing the surrounding legacy logic family, provided output current and voltage levels meet the official specification. The 14-CDIP format matches the through-hole style found in many older control systems. Engineers should confirm pin functions and supply polarity on the manufacturer datasheet before connecting or modernizing an existing board.
Recommandé
Process-Control Instrumentation
LM219J can be considered for process-control instrumentation when a sensor signal must be converted into a binary control decision using a reference voltage. Its dual-channel configuration can compare two sensed levels, and the verified 5 V to 30 V supply range supports a broader operating envelope than a simple 5 V-only comparator. However, the supplied data does not specify input offset, noise, common-mode range, temperature range, or response delay, all of which can determine whether the device is suitable for a precision process loop. Verify those limits and provide suitable transient protection at the connector and signal-conditioning stages.
Recommandé
Legacy Test and Measurement
LM219J is suitable for evaluation in older oscilloscope, signal-generator, and automated test fixtures that require high-speed binary decisions around analog inputs. A comparator can establish upper and lower limits, detect trigger crossings, or provide pass/fail logic for a test article. The verified dual comparator description and broad supply listing make it useful for two-channel fixture designs, but the supplied evidence does not provide propagation delay or input offset values. Bench engineers should verify those parameters from the Texas Instruments documentation and account for probe loading, cable delay, and fixture noise.
Recommandé
Embedded Control and Interfacing
LM219J can serve as an external threshold decision device beside an embedded controller in legacy or repair-oriented systems. The controller can read the comparator output as a discrete state while the analog front end handles sensor conditioning, and the dual channels allow two independent comparisons without adding another through-hole package. The verified output families include open-collector and TTL-compatible options, which can be useful when interfacing older peripheral buses. Confirm output polarity, pull-up requirements, input voltage limits, and timing against the official datasheet because these values are not present in the supplied search data.
Recommandé
Power and Battery Monitoring
LM219J may be evaluated for legacy battery or power-supply threshold monitoring because the verified supply range extends to 30 V and the device provides two comparison elements. One channel can monitor a supply rail against a reference while the second monitors a second threshold or polarity condition. This use is most appropriate when the monitored signals remain within the comparator's specified common-mode and input limits, which are not included in the supplied evidence. For high-current or safety-critical power conversion, add external dividers, filtering, isolation, and protection rather than relying on the comparator alone.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LM219J — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LM219N | LM119D |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
Principaux différenciateurs
- Wide verified supply envelope (vs LM219N)
- Dual high-speed comparator in one package (vs LM219N)
- Legacy logic-interface coverage (vs LM119D)
Notes de conception
Do not treat a similar dual-comparator name as proof of drop-in compatibility. The supplied comparison identifies LM219J as 14-CDIP and LM219N as PDIP-14, with different listed maximum supply ratings. Verify the physical outline, pin numbering, input polarity, output structure, and every operating limit before using LM219N or LM119D in an existing design.
The verified LM219J supply range is 5 V to 30 V, but that range does not by itself define safe input common-mode voltage or output-current capability. Confirm the official electrical characteristics for the selected supply configuration. If using an open-collector output, add the manufacturer-specified pull-up and confirm its voltage, current, and rise-time implications before driving the next logic stage.
For high-speed threshold or pulse detection, route comparator inputs as short as practical and keep them away from switching-node and power-return currents. The supplied sources identify the device as high speed but provide no numeric propagation-delay specification, so PCB length differences and input capacitance can affect behavior. Add local supply bypassing and use a stable reference node to prevent decision-point movement caused by supply or ground noise.
Informations de conformité
The supplied verified sources identify the manufacturer, package, supply range, output types, and distributor availability, but do not provide RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations.
