LM211QD - 115ns Differential Comparator | Texas Instruments
部品番号: LM211QD ✓ 生産中LM211QD 概要
A differential comparator is an analog integrated circuit that compares two input voltages and changes its output state when the differential input crosses a threshold. The LM211 belongs to the broader comparator hierarchy within analog and interface ICs, where it bridges the voltage-domain gap between analog sensors or signal chains and digital control logic. Its single-channel architecture provides a clear threshold decision while its wide supply range supports both 5 V logic and dual ±15 V analog systems.
Key specifications include a maximum response time of 115 ns, maximum input bias current of 300 nA, and maximum input offset current of 70 nA. The device supports operation across -40°C to +125°C, making it suitable for industrial temperature ranges. Its open-collector and open-emitter output architecture supports wired logic and allows pull-up or pull-down networks to establish the desired output level.
The LM211 architecture includes differential inputs and strobe control for coordinating comparator decisions in larger systems. The open-collector output can sink logic-level current, while the open-emitter structure provides complementary open-ended drive. Because open outputs do not establish a passive high level by themselves, external pull-up resistors are normally required when interfacing the collector output to TTL or MOS logic.
Typical applications include pulse-width and timing circuits, zero-cross detection, sensor thresholding, overvoltage and undervoltage indication, industrial control interfaces, and relay or lamp activation. Its 115 ns response time supports decisions where propagation delay matters, while the 3.5 V to 30 V supply range permits use in both low-voltage logic systems and higher-voltage analog equipment.
When designing a circuit around the LM211QD, begin with the output pull-up network and confirm that its resistor value satisfies the required sink current, rise time, and power dissipation. Keep comparator inputs away from switching nodes and high-current return paths, and use the strobe pin only according to the manufacturer timing and logic guidance.
This page combines the LM211QD specifications, pin-compatible replacement information, application guidance, and selection criteria to support faster design decisions than a basic distributor listing. Use the Request a Quote form on this page for current commercial availability, price, and lead-time requirements.
ドロップイン代替品: LM211QD — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
LM211QDG4
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
LM211DR
✅ ドロップイン ⚠️ 仕様未検証価格はお問い合わせください
データシートを見る →LM211MDREP
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM211QDRQ1
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM211D
✅ ドロップイン価格はお問い合わせください
データシートを見る →LM211QD 最大定格＆電気的特性
| Comparator Type | Single differential comparator with strobe |
| Response Time | 115 ns |
| Supply Voltage Range | 3.5 V to 30 V |
| Number of Channels | 1 channel |
| 出力タイプ | Open-collector and open-emitter |
| Maximum Input Bias Current | 300 nA |
| Maximum Input Offset Current | 70 nA |
| Strobe Function | Yes |
| TTL Output Compatibility | Compatible |
| MOS Logic Compatibility | Compatible |
| Supported Dual Supply | ±15 V |
| Supported Logic Supply | 5 V |
| 動作温度範囲 | -40°C to +125°C |
| パッケージ | 8-pin SOIC (D) |
| ピン数 | 8 pins |
| 実装タイプ | Surface mount |
| Output Load Capability | Lamp and relay driving |
LM211QD 8-pin soic (d) ピン配置ガイド
LM211QD (8-pin soic (d) パッケージ) のピン配置。 このアナログコンポーネントは、入力、出力、および電源ピンを備えています。オフセットナル、補償、イネーブルピンの設定については、メーカーのデータシートを参照してください。信号調整やアンプ回路に最適です。
詳細なピン配置データはありません: LM211QD.
詳細は データシート をご参照ください。
主な用途
LM211QD の用途: 6 件s: Pulse and Timing Control, Industrial Sensor Thresholding, Overvoltage and Undervoltage Detection, Zero-Cross and Level Detection, Lamp and Relay Interface, TTL and MOS Logic Interfacing.
Pulse and Timing Control
The LM211QD is appropriate for pulse-width, edge, and timing circuits because its 115 ns response time provides a defined propagation interval for threshold transitions. It can compare a rapidly changing signal against a reference and then drive a TTL or MOS input through the open-collector output. Designers should include an appropriate pull-up resistor and account for the resistor-capacitor output rise time in addition to the specified 115 ns response time.
おすすめ
Industrial Sensor Thresholding
The LM211QD can convert a sensor or analog measurement into a digital decision for industrial control equipment. Its differential inputs, 300 nA maximum input bias current, and 70 nA maximum input offset current help limit errors in high-impedance sensing arrangements, while the -40°C to +125°C range supports demanding ambient conditions. The open-collector output should use a pull-up network matched to the required logic family and system noise margin.
おすすめ
Overvoltage and Undervoltage Detection
The LM211QD is well suited to power-supply monitoring because it can operate from 3.5 V to 30 V and switch a logic indication when a monitored voltage crosses a reference threshold. The 115 ns response permits rapid fault signaling, and the open-emitter output offers additional open-ended drive flexibility. A production design should account for input common-mode limits, output pull-up components, and fault-state behavior documented in the manufacturer datasheet.
おすすめ
Zero-Cross and Level Detection
The LM211QD can detect a signal crossing a reference level in zero-cross, window, or level-detection circuits. Its 115 ns response time is useful when the system must react quickly to a transition, and its differential input arrangement allows the threshold to be referenced to a local return rather than an arbitrary system ground. Protective series resistance and careful routing are important when the monitored waveform contains fast edges or high common-mode excursions.
おすすめ
Lamp and Relay Interface
The LM211QD can control lamps and relays by combining its comparator decision with an appropriate transistor or driver stage. The comparator provides the low-current threshold decision, while the external driver handles the load current and voltage isolation. Its open-collector output requires a pull-up arrangement, and the selected switching device must be checked for coil transients, saturation voltage, and current limits. The 3.5 V to 30 V supply range supports varied control platforms.
おすすめ
TTL and MOS Logic Interfacing
The LM211QD is intended for interfacing analog decisions with TTL and MOS logic systems. Its open-collector output can sink current for a low state, while an external pull-up resistor establishes the high state, and the open-emitter output adds a complementary open-ended output structure. Designers should select the pull-up value from the required rise time, sink-current capability, power consumption, and noise-immunity requirements rather than choosing it solely from the supply voltage.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: LM211QD — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | LM211QDG4 | LM211DR | LM211MDREP | LM211QDRQ1 | LM211D |
|---|---|---|---|---|---|---|
| Package | 8-pin SOIC (D) | 8-pin SOIC (D) | 8-pin SOIC (D) | 8-pin SOIC (D) | 8-pin SOIC (D) | 8-pin SOIC (D) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | National Semiconductor Corporation |
| Function | Single differential comparator with strobe | LM211-family differential comparator | LM211-family differential comparator | Differential comparator with strobes | LM211-family differential comparator | Compatible differential comparator |
| Response Time | 115 ns | 115 ns | 115 ns | 115 ns | 115 ns | 115 ns |
主な差別化要因
- Fast single-comparator response （vs LM211D)
- Wide single-supply operating range （vs LM211MDREP)
- Dual open-ended output structures （vs LM211QDRQ1)
設計ノート
Treat the open-collector output as requiring an external pull-up resistor. Without one, the output cannot establish a valid high state on its own. Select the resistor using the required rise time, input capacitance, pull-up current, and available sink current rather than applying a universal value. Also confirm that the open-emitter output is connected to a compatible pull-down or driver arrangement before powering the circuit.
Route the differential input traces as a compact pair and keep them away from switching-node copper, relay coils, and high-current return paths. Place the input-network components close to the comparator pins to minimize parasitic pickup. When the input source is high impedance, provide a defined bias path within the device's input-current and common-mode limits, and use a ground reference that remains stable during output transitions.
The 115 ns response time does not by itself determine the usable bandwidth of the complete interface. The open-collector rise time depends on the pull-up resistance and total node capacitance, so calculate that time separately for the intended logic load. For high fan-out or long interconnects, use a lower pull-up resistance within the sink-current limit or add a suitable buffer to preserve edge quality and maintain noise margin.
コンプライアンス情報
The LM211QD is not identified as an AEC-Q100-qualified automotive part in the manufacturer product documentation. RoHS, REACH, lead-free, halogen-free, and conflict-minerals status require confirmation from the applicable manufacturer compliance documentation.
