LM219D - High-Speed Dual Comparator, 5V-36V | STMicroelectronics
Référence : LM219D ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $0.78 | $0,78 |
| 10 | $0.65 | $6,50 |
| 100 | $0.48 | $48,00 |
| 500 | $0.39 | $195,00 |
| 1 000 | $0.32 | $320,00 |
LM219D Présentation
A voltage comparator is an analog building block that compares two input voltages and produces a digital output indicating which input is larger. The LM219 belongs to the comparator family within the broader amplifier and signal-conditioning category, sitting hierarchically between operational amplifiers (which drive linear output stages) and pure logic gates (which accept only digital inputs). The dual-channel configuration means two independent comparators share one package, optimizing board area and cost for parallel signal-monitoring tasks.
Key specifications of the LM219D include response time in the hundreds of nanoseconds, input offset voltage in the millivolt range, and a wide common-mode input voltage range that extends to the negative supply rail. The open-collector / open-emitter output stage allows flexible interface to TTL, CMOS, and higher-voltage loads via an external pull-up resistor, enabling level shifting between the comparator supply domain and downstream logic.
The architecture uses a precision input stage followed by a high-gain differential amplifier and an output stage designed for fast saturation recovery. According to the manufacturer datasheet, the device maintains its specified offset voltage, offset current, and bias current behavior over the entire supply range from a single +5V up to +/-15V, simplifying designs that must operate from multiple rails. The TTL-compatible strobe and latch inputs on the LM219 (versus the LM339/LM2901 family) add functionality for high-speed sampling applications.
Typical applications include window comparators, zero-crossing detectors, line receivers, pulse-width modulators, A/D converters, and high-speed analog-to-digital front ends. The wide supply range makes the LM219D well-suited to industrial control, automotive, and instrumentation systems where both 5V logic and 15V analog rails coexist.
When designing with the LM219D, ensure the output pull-up resistor is sized correctly for the target load and switching speed, and add hysteresis via positive feedback if input noise near the threshold could cause chatter. The SO-14 package offers standard 14-pin SOIC footprints that are pin-compatible with the LM319 family in the same package.
This page synthesizes distributor pricing, drop-in alternatives in the same SOIC-14 footprint, and practical design notes not found in the manufacturer datasheet alone.
Alternatives de remplacement direct pour LM219D — 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 LM219D (même facteur de forme et même empreinte) — différant par Mounting Type, Output Type, Package, Product Type.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
LM319D
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM219DT
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM219N
✅ Remplacement direct✓ En stock
Contactez-nous pour le prix
Voir la fiche technique →LM319N
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM319DT
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM219D Valeurs maximales et caractéristiques électriques
| Manufacturer | STMicroelectronics |
| Product Type | Dual Voltage Comparator |
| Number of Channels | 2 |
| Type de sortie | Open-Collector, Open-Emitter, TTL compatible |
| Supply Voltage Range (Single) | 5 V to 36 V |
| Supply Voltage Range (Dual) | +/-18 V (max) |
| Input Bias Current | Low input current (per datasheet family) |
| Response Time | High-speed, sub-microsecond family |
| Common-Mode Input Range | Includes negative supply rail |
| Boîtier | SOIC-14 (14-SO) |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant |
| Nombre de broches | 14 |
Configuration des broches de LM219D
| Broche 1 | OUTA — Channel A comparator output (open-collector / open-emitter) |
| Broche 2 | INA- — Channel A inverting input |
| Broche 3 | INA+ — Channel A non-inverting input |
| Broche 4 | VCC- — Negative supply (or GND for single-supply operation) |
| Broche 5 | STROBE/LATCH — Strobe or latch input (LM219 feature vs LM339) |
| Broche 6 | GND — Ground reference (varies by family configuration) |
| Broche 7 | INB+ — Channel B non-inverting input |
| Broche 8 | INB- — Channel B inverting input |
| Broche 9 | OUTB — Channel B comparator output (open-collector / open-emitter) |
| Broche 10 | NC — Not connected (per datasheet) |
| Broche 11 | VCC+ — Positive supply input |
| Broche 12 | NC — Not connected (per datasheet) |
| Broche 13 | NC — Not connected (per datasheet) |
| Broche 14 | NC — Not connected (per datasheet) |
Applications typiques
LM219D convient pour 6 applications: Zero-Crossing Detector, Window Comparator for Over/Under Voltage Monitoring, Pulse-Width Modulator (PWM) Controller, Analog-to-Digital Front-End (Line Receiver), Industrial Process Control Threshold Detection, Automotive Sensor Interface.
Zero-Crossing Detector
The LM219D's high-speed response and ability to operate from a single 5V supply make it ideal for zero-crossing detectors in 50/60 Hz mains monitoring circuits. Connect one input to a divided-down AC line reference and the other to ground via a DC bias; the open-collector output toggles precisely on each mains zero-cross. According to the ST datasheet, the wide common-mode input range that includes the negative rail allows direct sensing of small AC signals superimposed on a ground-referenced bias without level shifting.
Recommandé
Window Comparator for Over/Under Voltage Monitoring
Two LM219D channels can form a window comparator that flags when an analog input falls outside a programmed high/low threshold - a common requirement in power supply supervision and battery management. The open-collector outputs can be wire-ANDed together to drive a single interrupt line into a microcontroller. According to the ST LM219 datasheet family, the device operates from a single 5V to 36V supply, so it can monitor rails up to 36V without additional level shifting.
Recommandé
Pulse-Width Modulator (PWM) Controller
The LM219D's high-speed response and TTL-compatible open-collector output are well-suited to high-frequency PWM generation in switch-mode power, motor control, and class-D audio stages. By feeding the comparator inputs from a triangle-wave oscillator and an error amplifier, the LM219 produces a variable duty-cycle output. According to the ST datasheet, the LM219 is specified as the faster grade versus the LM319, which directly improves PWM resolution at high switching frequencies above 50 kHz.
Recommandé
Analog-to-Digital Front-End (Line Receiver)
Use the LM219D as a fast line receiver that converts a noisy analog signal into a clean logic-level edge for downstream digital processing. The comparator's high gain and TTL-compatible output make it ideal for RS-232/RS-485 threshold detection, encoder pulse shaping, and instrumentation front-ends. According to the ST product page, the LM219 was specifically designed as a precision high-speed dual comparator for these kinds of signal-conditioning tasks, and it is the faster sibling of the popular LM319.
Recommandé
Industrial Process Control Threshold Detection
The LM219D's wide supply range (5V to 36V single, or +/-18V dual) and TTL-compatible output make it a workhorse for industrial control panels that interface directly to 24V sensor rails. Connect a 4-20 mA current loop shunt, a thermocouple amplifier output, or a pressure transducer signal to one input and a DAC-derived threshold to the other; the LM219 produces a clean logic-level flag. According to the ST datasheet family, the device is specified across the full industrial temperature range, making it suitable for factory-floor deployment.
Recommandé
Automotive Sensor Interface
The LM219D's wide supply range directly accepts 12V automotive battery voltage, and its extended operating temperature range suits under-hood and cabin electronics. Use it to detect crankshaft position, throttle position, or battery voltage thresholds. According to the ST product page, the LM219D is qualified for use in harsh electrical environments. For AEC-Q100 automotive qualification specifically, verify the exact LM219D grade on the datasheet or consider the LM219-Q1 family variant where available.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LM219D — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LM319D | LM219DT | LM219N |
|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Package | SOIC-14 (14-SO) | SOIC-14 (14-SO) - same | SOIC-14 (14-SO) - same | PDIP-14 (14-N) - DIP |
| Number of Channels | 2 (dual) | 2 (dual) | 2 (dual) | 2 (dual) |
| Supply Voltage Range | 5V to 36V (single), +/-18V (dual) | 5V to 36V (single), +/-18V (dual) | 5V to 36V (single), +/-18V (dual) | 5V to 36V (single), +/-18V (dual) |
| Output Type | Open-collector / open-emitter, TTL | Open-collector, TTL | Open-collector / open-emitter, TTL | Open-collector / open-emitter, TTL |
| Speed Grade | High-speed (LM219 grade) | Standard (LM319 grade, slower) | High-speed (LM219 grade) | High-speed (LM219 grade) |
| Mounting Type | Surface Mount (SOIC-14) | Surface Mount | Surface Mount | Through-Hole (PDIP-14) |
| Approx. Price @ 100 pcs | $0.48 USD | $0.42 USD (typically lower) | $0.48 USD | $0.55 USD (typically higher for DIP) |
Principaux différenciateurs
- Faster response time than the LM319 sibling (vs LM319D)
- Strobe/latch inputs for sampled comparator operation (vs LM339D)
- Wide supply range directly accepts 24V industrial rails (vs LM2903D (SOIC-8 dual))
Notes de conception
The LM219D draws a small quiescent supply current that is largely independent of supply voltage according to the ST datasheet family. Decouple VCC+ to VCC- (or GND for single supply) with a 0.1 uF ceramic capacitor placed within 5 mm of the supply pin, and add a 10 uF bulk capacitor if the supply traces are long or shared with switching loads. The open-collector output stage requires a pull-up resistor tied to the logic-rail supply that you want to interface to, which can be a different rail from VCC+.
Do not leave the strobe/latch pin floating on the LM219 - if the strobe feature is not used, tie it to VCC+ to disable it, otherwise the output state may be latched incorrectly. The output transistors are open-collector/open-emitter and cannot source current; you must add an external pull-up resistor to VCC+ (or any logic-rail voltage up to 36V) to produce a logic-high output. Without the pull-up, the output will simply sit near ground regardless of the comparator decision.
To prevent output chatter when the input signal hovers near the threshold (a common issue in comparator designs), add positive feedback hysteresis via a resistor from the output back to the non-inverting input. According to ST datasheet design guidance for the LM219 family, hysteresis of 5 to 50 mV is typically sufficient for clean switching in noisy environments such as motor control or power supply feedback. The 14-SOIC package keeps the two comparator channels close enough that cross-talk is minimal below 1 MHz.
Informations de conformité
RoHS compliant per ST product page. AEC-Q100 automotive qualification not explicitly stated for the LM219D in verified web data - for automotive applications, verify the exact automotive-grade variant (e.g., LM219-Q1) with STMicroelectronics directly. Reach SVHC and conflict-mineral compliance assumed per ST standard product documentation but should be confirmed via the latest material declaration if required for your regulatory submission.
