LM211D - Single Differential Comparator with Strobe | Texas Instruments
料号： LM211D ✓ 量产中LM211D 概述
A differential comparator is an integrated circuit that compares two input voltages and changes its output state according to their relative polarity. It belongs to the comparator hierarchy within analog and interface semiconductors: differential comparator → voltage comparator → analog interface IC → semiconductor. Unlike a general-purpose operational amplifier, the LM211D provides a saturated, logic-oriented output intended for threshold detection and switching rather than linear amplification.
The LM211 family is described by Texas Instruments as a single high-speed voltage comparator. Its differential inputs allow a circuit to establish a switching threshold with an external reference, while the strobe function provides control over when the internal output participates in state changes. The open-collector architecture supports wired-interface and pull-up arrangements, although the required pull-up component and its implementation details are not included in the supplied source snippets.
The LM211D uses logic-compatible output levels that can interface with TTL and MOS logic. This makes it suitable for translating an analog decision into a digital control signal. The manufacturer specifically identifies lamp and relay driving as supported applications, although the exact current limits, output sink-current ratings, response times, input common-mode limits, and input offset voltage were not present in the retrieved data and must be confirmed in the complete manufacturer datasheet before a final design is released.
Typical uses include sensing a voltage crossing a reference level, detecting the state of a sensor or timing signal, driving digital control logic, and operating lamp or relay interfaces. In a practical circuit, the two inputs receive the signal and threshold voltages, the output uses an appropriate pull-up arrangement for open-collector operation, and the strobe pin is connected so the application can either enable or disable normal comparison behavior as required.
The primary design consideration is to verify the complete electrical limits and pin functions from the official LM211 datasheet before layout sign-off. Designers should pay particular attention to input common-mode range, output current, supply sequencing, open-collector pull-up voltage, and strobe logic because these values were not included in the retrieved snippets. The 8-pin SOIC footprint also requires adequate spacing between adjacent pins for soldering and inspection.
This page consolidates verified manufacturer and distributor information, cross-brand sourcing references, package details, selection guidance, and application-specific engineering considerations. It also clearly separates confirmed LM211D characteristics from parameters that still require datasheet verification, providing a useful basis for early component selection without replacing the authoritative manufacturer documentation.
直接替换替代料： LM211D ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
LM111D
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LM311D
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LM211D
✅ 直接替换联系询价
查看数据手册 →LM211D 最大额定值与电气特性
| Comparator Type | Single differential comparator with strobes |
| Architecture | Differential voltage comparator |
| Supply Voltage Examples | ±15 V and 5 V |
| 输出类型 | Open-collector |
| Logic Compatibility | TTL and MOS compatible |
| Load Capability | Capable of driving lamps or relays |
| 封装 | 8-pin SOIC |
| 工作温度范围 | -40°C to +85°C |
| Number of Channels | 1 channel |
| Input Configuration | Differential inputs |
| Strobe Function | Yes |
| 安装类型 | Surface mount |
| Datasheet Page Count | 25 pages |
| Datasheet File Size | 506 kB |
LM211D 8-pin soic 引脚配置指南
LM211D（8-pin soic 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： LM211D.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LM211D 适用于 6 应用s: Voltage Threshold Detection, TTL Logic Interfacing, Lamp and Relay Drive Logic, Industrial Sensor Conditioning, Power Supply Supervision, MOS Logic Interfacing.
Voltage Threshold Detection
The LM211D fits analog threshold-detection circuits because it compares two differential input voltages and produces a logic-oriented open-collector result. According to the Texas Instruments LM211 product information, it is a single high-speed voltage comparator that supports both ±15 V and 5 V supply environments. One input can receive the sensed voltage while the other receives a reference, allowing the circuit to indicate when a signal crosses a defined level. The exact input common-mode range, offset voltage, and response time were not included in the supplied excerpts, so those values must be confirmed before setting operating margins.
推荐
TTL Logic Interfacing
The LM211D is suitable for interfaces between analog sensing circuitry and TTL logic because Texas Instruments confirms that its output levels are compatible with most TTL and MOS circuits. The open-collector output can present a valid logic state through a suitable pull-up arrangement, allowing the comparator result to feed digital control logic without adding a separate line-driver stage. The retrieved information does not provide the output sink-current rating, pull-up voltage limit, or propagation delay, so the pull-up resistor and timing budget must be calculated from the complete manufacturer datasheet.
推荐
Lamp and Relay Drive Logic
The LM211D can support lamp and relay applications by providing a decision signal to an appropriate driver or load interface. Texas Instruments specifically identifies the LM211 family as capable of driving lamps or relays, while its TTL- and MOS-compatible output levels simplify connection to surrounding digital control. Because the retrieved excerpts do not provide allowable output current, voltage, or thermal limits, engineers should not assume that every lamp or relay can be connected directly to the output pin. Use the complete output limits to decide whether an external transistor or other driver stage is required.
推荐
Industrial Sensor Conditioning
The LM211D can convert a sensor-derived analog condition into a digital state for industrial monitoring and control. Its differential input arrangement supports comparison of a sensed signal against a reference, while the wide supply range includes operation from 5 V logic rails and ±15 V analog-system rails. The open-collector output can connect to compatible TTL or MOS control circuitry through a suitable pull-up arrangement. Designers must still verify the common-mode range, input offset, noise behavior, and response time because these detailed parameters were not supplied in the verified excerpts.
推荐
Power Supply Supervision
The LM211D can be used in simple power-supply monitoring circuits to identify when a measured rail crosses a reference threshold. Its single differential-comparator architecture and TTL/MOS-compatible open-collector output suit systems requiring a hardware decision signal separate from a microcontroller input. The comparator can provide a useful fault or control indication in analog or mixed-signal equipment. The complete datasheet must be consulted for the permitted input range, supply-current consumption, output-current capability, and any response-time consequences before using the device as a dedicated supervisor.
推荐
MOS Logic Interfacing
The LM211D is suitable for MOS-logic interfaces because the Texas Instruments product information states that its output levels are compatible with most MOS circuits. The comparator can therefore operate as the analog decision element in a mixed-signal control path, with its open-collector output connected through the appropriate pull-up arrangement. This arrangement can support legacy CMOS systems where an open-collector interface is required. Before implementation, verify the pull-up supply voltage, output sink current, input levels, and power-sequencing constraints using the full Texas Instruments or alternative-manufacturer datasheet.
推荐
工程参考数据： LM211D ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LM111D | LM311D | LM211D | LM211D | LM211D |
|---|---|---|---|---|---|---|
| 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 | STMicroelectronics | onsemi | NXP |
关键差异点
- Integrated strobe control （对比 LM311D)
- Cross-brand sourcing availability （对比 STMicroelectronics LM211D)
- TTL and MOS output compatibility （对比 onsemi LM211D)
设计说明
Do not treat an 8-pin SOIC footprint match as proof of electrical compatibility. Before replacing an LM211D, compare the complete pin function table, differential-input polarity, strobe truth table, input common-mode limits, output sink-current rating, and open-collector pull-up limits. The retrieved distributor snippets confirm the package and general comparator type but do not expose these detailed electrical values, so the manufacturer datasheet must remain the release authority.
The LM211 can operate from supply arrangements including ±15 V and 5 V, but the external pull-up on an open-collector output must remain within the device's permitted output voltage range. Do not connect the output to an unrestricted supply voltage. Select the pull-up voltage and resistance from the official output-characteristics data after checking the attached load's leakage, rise-time requirements, and available sink current.
Keep the comparator input and reference traces short, place any input RC filtering close to the relevant pins, and isolate noisy switching or relay-drive routes from the differential inputs. Because the open-collector output may require an external pull-up, route that pull-up close to the device while keeping the logic destination away from high-current switching paths. These layout practices reduce susceptibility to pickup and switching transients, but the final topology depends on the verified output limits.
合规信息
The supplied manufacturer and distributor excerpts do not provide verified RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. The Texas Instruments LM211D part-details search result identifies an operating range of -40°C to +85°C, but it does not state AEC-Q100 qualification.