LM211-LM311 - Single High-Speed Differential Comparator
料号： LM211-LM311 ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
LM211-LM311 概述
A voltage comparator is a semiconductor device that compares two input voltages and switches its output according to their relationship. In the broader IC hierarchy, a comparator belongs to the analog signal-conditioning and interface family, alongside op-amps and logic interfaces. The LM211-LM311 family is useful when a design needs a threshold decision, overvoltage indication, level translation, or relay-drive function rather than linear analog amplification.
The verified manufacturer material identifies the devices as single high-speed comparators with low input current. According to the Texas Instruments datasheet material supplied, the output levels are compatible with most TTL and MOS circuits, and the devices are capable of driving lamps or relays. The onsemi material additionally states that the inputs can be isolated from system ground while the output can drive loads referenced to ground, VCC, or VEE. These features support industrial control, instrumentation, and legacy interface designs.
The family includes temperature and sourcing differences between LM211 and LM311 variants. The supplied Mouser datasheet excerpt specifies LM211 operation from −25°C to +85°C and LM311 operation from 0°C to +70°C for the referenced comparison. The same excerpt states that offset voltage, offset current, and bias-current specifications apply from a single 5 V supply up to ±15 V supplies, and that the positive input voltage limit is 30 V above the negative supply. Exact ordering codes and package-specific electrical limits require the relevant manufacturer datasheet and suffix.
Typical uses include sensing a control voltage against a reference, detecting an overvoltage condition, switching a relay when a sensor crosses a threshold, and interfacing an analog signal to TTL or MOS logic. Because the output is open collector, a pull-up resistor is generally required. The pull-up must be selected against the required sink current, output voltage, speed, and system supply constraints.
The principal design consideration is ensuring that input common-mode voltage, supply voltage, output pull-up, and input/output isolation meet the particular LM211 or LM311 ordering variant. The family designation alone does not identify a unique package, suffix, temperature grade, or exact parameter set. Use the manufacturer datasheet linked on this page before committing a footprint or substituting a part.
This page consolidates the verified manufacturer descriptions, practical comparator usage guidance, and the available cross-reference information. It distinguishes confirmed family-level facts from ordering-code-specific data that is not established by the supplied search results.
直接替换替代料： LM211-LM311 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LM211-LM311 （相同外形与封装尺寸） ——差异在于 Product Type, Positive Input Voltage Limit.
快速对比工具——选择替代料号进行并排对比：
LM311
✅ 直接替换📋 参考替代料（不在目录中）
LM211
✅ 直接替换📋 参考替代料（不在目录中）
NTE922
✅ 直接替换✓ 有现货
$10.136 / 个
查看数据手册 →LT111A
✅ 直接替换✓ 有现货
联系询价
查看数据手册 →LM211-N
✅ 直接替换📋 参考替代料（不在目录中）
LM211-LM311 最大额定值与电气特性
| Product Type | Single differential voltage comparator |
| Comparator Family | LM211 / LM311 |
| Supply Range | Single 5 V to 30 V, or ±15 V split supplies |
| Single-Supply Compatibility | 5 V logic supply |
| Split-Supply Compatibility | ±15 V operational-amplifier supply |
| Input Type | Differential inputs |
| 输出类型 | Open-collector output |
| Logic Compatibility | Compatible with most TTL and MOS circuits |
| Load Capability | Capable of driving lamps or relays |
| Input Common-Mode Behavior | Inputs can be isolated from system ground |
| Output Reference Capability | Loads may be referenced to ground, VCC, or VEE |
| LM211 Temperature Range | −25°C to +85°C |
| LM311 Temperature Range | 0°C to +70°C |
| Positive Input Voltage Limit | 30 V above the negative supply |
| Offset and Bias Specification Supply Scope | Single 5 V through ±15 V supplies |
LM211-LM311 standard 引脚配置指南
LM211-LM311（standard 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： LM211-LM311.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LM211-LM311 适用于 8 应用s: Overvoltage Detection, Relay Threshold Control, TTL Logic Interfacing, Sensor Signal Conditioning, Lamp and Indicator Drive, Power Supply Fault Signaling, Window and Limit Comparison, Legacy Analog Control Interface.
Overvoltage Detection
The LM211-LM311 family can compare a monitored voltage against a reference threshold and change state when the monitored node crosses the limit. Place the divider on the non-inverting input and the reference on the inverting input, or reverse the inputs when the required active polarity differs. The verified manufacturer material confirms differential inputs and compatibility with 5 V logic systems. Because the output is open collector, use a pull-up resistor and select it for the required sink current and downstream logic voltage. Confirm the exact ordering code's input common-mode and supply limits before using it near the rails.
推荐
Relay Threshold Control
The LM211-LM311 can switch a relay when a sensor or control voltage crosses a defined threshold, which makes it useful for industrial alarm and interlock functions. Compare the sensor-derived voltage with a stable reference and use the open-collector output to sink the relay-coil current through the appropriate pull-up and transistor interface. The verified Texas Instruments description states that the devices are capable of driving lamps or relays. A flyback diode is normally required across an inductive coil, and the exact relay current must remain below the selected device's output rating.
推荐
TTL Logic Interfacing
The LM211-LM311 output can interface with most TTL and MOS circuits according to the verified Texas Instruments material. Its open-collector output allows the designer to choose a pull-up voltage and resistor that match the receiving logic family rather than relying on a fixed active-high or active-low push-pull output. Keep the pull-up connection close enough to the comparator and logic input to limit propagation effects, and check the comparator's sink-current capability at the selected supply voltage. This arrangement is useful when a sensor or analog threshold must become a digital control event.
推荐
Sensor Signal Conditioning
A low-input-current comparator can turn a slowly changing sensor signal into a clean switching event when the design compares against a known reference. LM211-LM311 is suitable for threshold conditioning when the sensor source impedance and input bias requirements are verified for the exact suffix. The differential inputs also support configurable inversion and reference placement. Keep the sensing path away from high-current switching nodes, provide a stable reference, and account for input offset and temperature variation when the threshold must be precise.
推荐
Lamp and Indicator Drive
The verified manufacturer material identifies lamp driving as an intended capability of the LM211-LM311 family. An open-collector output can sink current through a lamp and pull-up network when the lamp voltage, current, and switching speed are within the selected comparator's ratings. For higher-current or inductive loads, add an appropriate transistor or driver rather than exceeding the output limits. Select the pull-up resistor to balance LED or lamp brightness against comparator dissipation, and verify the exact package and ordering-code current limits before layout.
推荐
Power Supply Fault Signaling
A comparator can monitor a divided supply rail and assert a fault signal when the rail leaves its acceptable range. LM211-LM311 supports single 5 V to 30 V operation or ±15 V split supplies according to the verified onsemi material, making the family relevant to legacy analog and industrial systems. Place two independent thresholds around the rail when both undervoltage and overvoltage must be detected. The fault signal should be pulled up only to a voltage permitted by the receiving logic, and the circuit must respect the comparator's positive-input voltage limit.
推荐
Window and Limit Comparison
Two comparator channels can be used to implement an upper and lower voltage window, with the LM211-LM311 family providing the decision function for each threshold. The LM211 or LM311 open-collector outputs can be combined through pull-up networks or external logic to create a valid-window signal. This approach is useful for battery, test-equipment, and industrial control systems that must distinguish below-limit, in-range, and above-limit conditions. Verify offset voltage, input bias current, response time, and output saturation for the exact suffix before setting narrow margins.
推荐
Legacy Analog Control Interface
LM211-LM311 can bridge older ±15 V analog systems to modern logic by comparing an analog control voltage and producing an open-collector switching event. The verified family description supports ±15 V operational-amplifier supplies and 5 V logic systems, while onsemi notes that inputs can be isolated from system ground. That flexibility helps preserve existing signal paths during a mixed-signal redesign. Still check absolute maximum input voltage, output current, and pull-up voltage against the exact manufacturer and suffix before connecting legacy nodes.
推荐
推荐产品汇总
工程参考数据： LM211-LM311 ——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 | LM311 | LM211 | NTE922 | LT111A |
|---|---|---|---|---|---|
| Product Family | LM211-LM311 family designation | LM311 comparator | LM211 comparator | Possible LM311 equivalent listed in cross-reference data | Possible LM311 equivalent listed in cross-reference data |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | NTE | Analog Devices |
关键差异点
- Family-level flexibility across single and split supplies （对比 LM311)
- Temperature-grade distinction within the related family （对比 LM311)
- Open-collector output for flexible pull-up integration （对比 NTE922)
设计说明
Do not treat LM211-LM311 as a single orderable device. First identify whether the board requires LM211 or LM311, then confirm the manufacturer, package suffix, temperature grade, pinout, and output limits. The supplied material cites −25°C to +85°C for LM211 and 0°C to +70°C for LM311, making the distinction relevant to industrial temperature requirements. Also verify the positive-input voltage limit, which the supplied Mouser excerpt identifies as 30 V above the negative supply.
Design the open-collector output network around the downstream load. Select a pull-up resistor that establishes a valid logic-high level while keeping the comparator's sink current within its exact ordering-code rating. When driving a relay or lamp, calculate the worst-case coil or lamp current and include a flyback diode or other inductive-load protection as appropriate. The verified manufacturer material confirms lamp and relay drive capability, but it does not remove the need to check the selected device's limits.
Keep comparator input traces short and away from relay-coil wiring, switching inductors, and high-current return paths. Route the pull-up and load current so output transients do not couple directly into the reference or sensor input. Provide a stable reference node and adequate bypassing according to the selected manufacturer datasheet. Because the family supports inputs isolated from system ground, verify that the intended input arrangement is electrically safe for the actual system grounding and supply topology.
合规信息
Compliance information was not included in the supplied verified manufacturer or distributor search results. Check the current manufacturer product documentation and exact ordering-code declaration before production use.
