LM219J - High-Speed Dual Comparator | Texas Instruments
MPN： LM219J ✓ 啟用中| 數量 | 單價 | 小計 |
|---|---|---|
| 1 | $32.3438 | $32.34 |
| 10 | $23.3594 | $233.59 |
| 100 | $20.6641 | $2,066.41 |
| 500 | $19.7656 | $9,882.80 |
| 1,000 | $18.8672 | $18,867.20 |
LM219J 概覽
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.
直接替換替代品，適用於 LM219J — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
快速比較工具 — 選擇替代零件進行並排比較：
LM219N
聯絡詢價
查看資料表 →LM119D
📋 參考替代品（不在目錄中）
LM219J 最大額定值與電氣特性
| 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 |
| 輸出類型 | DTL, open-collector, open-emitter, RTL, TTL |
| 封裝 | 14-CDIP |
| Package Body Width | 0.300 in |
| Package Width | 7.62 mm |
| 安裝類型 | Through-hole |
| Comparator Class | Precision high-speed dual comparator |
| Monolithic Construction | Single monolithic chip |
| Logic Compatibility | DTL, open-collector, open-emitter, RTL, TTL |
LM219J 7.62 mm 腳位配置指南
LM219J（7.62 mm 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： LM219J.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM219J 適用於 7 應用s: 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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 LM219J — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | LM219N | LM119D |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
主要差異化特點
- Wide verified supply envelope (對比LM219N)
- Dual high-speed comparator in one package (對比LM219N)
- Legacy logic-interface coverage (對比LM119D)
設計說明
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.
合規資訊
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.
