LT1011CH - Low-Power Precision Comparator | Analog Devices
料号： LT1011CH ✓ 量产中LT1011CH 概述
A voltage comparator is an analog integrated circuit that compares two input voltages and produces a logic-level output indicating which input is higher. The LT1011 belongs to the comparator hierarchy within interface and signal-conditioning semiconductors. Unlike an operational amplifier used primarily for closed-loop amplification, a comparator is optimized for rapid, deterministic output transitions and is commonly used in threshold detection, sensing, and control systems.
The LT1011's principal advantage over the LM111 reference family is its improved input behavior. According to the Analog Devices manufacturer datasheet, it offers four times lower bias current, six times lower offset voltage, and five times higher voltage gain than the LM111. It also adds a guaranteed 15 uV/°C offset-voltage drift specification and reduces supply current. These characteristics make the part useful when comparator accuracy, input loading, or temperature stability has more importance than absolute switching speed.
The LT1011CH provides an open-collector output, allowing the output to pull a logic rail low while an external pull-up resistor establishes the high state. This architecture supports wired logic, level translation, and wired-AND functions, but it also requires a pull-up resistor and suitable rise-time control. Input common-mode range, supply voltage, response time, and output sink-current limits should be checked against the manufacturer datasheet for the exact operating conditions.
Typical uses include precision threshold detection, window comparison, sensor conditioning, relay or actuator control, and low-current digital interfacing. The low 25 nA maximum input bias current is especially useful with high-impedance sensors, while the 0.5 mV maximum offset voltage supports comparisons where input-level differences are small. The pin-compatible relationship with the LM111 series also allows existing LM111-based boards to be evaluated for an upgrade.
For reliable implementation, connect the open-collector output to a suitable pull-up resistor, place it close to the receiving logic input, and keep sensitive input traces away from switching nodes. Account for input offset and drift when defining the decision threshold, and verify that the output pull-up voltage, sink current, supply voltage, and input common-mode limits satisfy the application. The exact operating limits must be taken from the manufacturer datasheet.
This page combines the LT1011CH device specifications, package information, verified manufacturer and distributor links, same-footprint alternatives, and practical comparator design guidance. It also identifies where a drop-in decision requires additional qualification, especially for temperature grade, input performance, output timing, and automotive or industrial system requirements.
直接替换替代料： LT1011CH ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
LT1011AH
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LT1011ACH
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LT1011A
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LM111H
✅ 直接替换📋 参考替代料（不在目录中）
LM111H/883
✅ 直接替换📋 参考替代料（不在目录中）
LT1011CH 最大额定值与电气特性
| Comparator Type | General-purpose voltage comparator |
| Maximum Input Offset Voltage | 0.5 mV |
| Maximum Input Bias Current | 25 nA |
| Maximum Input Offset Current | 3 nA |
| Guaranteed Input Offset Voltage Drift | 15 uV/°C |
| Output Architecture | Open-collector |
| 封装 | TO-5, 8 terminals |
| Terminal Count | 8 terminals |
| 安装类型 | Through-hole |
| Temperature Grade | Commercial |
| Pin Compatibility | Compatible with LM111 series devices |
| Bias-Current Advantage Versus LM111 | 4 times lower |
| Offset-Voltage Advantage Versus LM111 | 6 times lower |
| Voltage-Gain Advantage Versus LM111 | 5 times higher |
LT1011CH to-5, 8 terminals 引脚配置指南
LT1011CH（to-5, 8 terminals 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： LT1011CH.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LT1011CH 适用于 6 应用s: Precision Threshold Detection, High-Impedance Sensor Interfacing, Window and Limit Monitoring, Relay and Actuator Control, Logic-Level Signal Conditioning, Portable and Battery-Powered Systems.
Precision Threshold Detection
The LT1011CH suits precision threshold detection because its guaranteed maximum input offset voltage is 0.5 mV and its maximum input bias current is only 25 nA. Place the comparator so the two inputs monitor the signal and its reference voltage, then use the open-collector output to pull a logic input low whenever the threshold is crossed. According to the Analog Devices manufacturer datasheet, the LT1011 also has a guaranteed 15 uV/°C offset drift. Include that drift and the 0.5 mV offset in the threshold-error budget, and verify that both signals remain inside the comparator's common-mode range.
推荐
High-Impedance Sensor Interfacing
The LT1011CH can compare sensor-derived voltages without imposing excessive load on a high-impedance source. Its guaranteed maximum input bias current of 25 nA and maximum input offset current of 3 nA help limit errors caused by source resistance and leakage. The open-collector output can drive a pulled-up digital line or relay-control stage. According to the Analog Devices manufacturer datasheet, the LT1011 has four times lower bias current than the LM111 reference family. Keep input traces short, avoid nearby switching paths, and confirm that the sensor's output voltage remains within the comparator's specified common-mode range.
推荐
Window and Limit Monitoring
Two LT1011CH comparators can establish upper and lower limits for a measured voltage, creating a window-monitoring function for supply rails, battery systems, or industrial sensor nodes. The 0.5 mV maximum input offset and 15 uV/°C guaranteed drift make the decision boundaries more repeatable, while the 25 nA maximum input bias current minimizes loading on a high-impedance divider. Each open-collector output can join a common pulled-up bus so the system receives a fault indication when either limit is crossed. Size the pull-up resistor for the required rise time and verify output sink current against the combined wired-AND load.
推荐
Relay and Actuator Control
The LT1011CH can translate a low-level analog threshold into a control signal for a relay driver, solenoid interface, or industrial actuator controller. Its open-collector output is useful when the actuator stage requires an active-low fault or enable input and can accommodate a pull-up to the logic rail used by that stage. For low-level control decisions, the comparator's 0.5 mV maximum offset and 25 nA maximum input bias current are advantageous. Keep the sensitive comparison path separated from relay-coil currents, provide the required flyback path at the actuator, and check the comparator's output timing and sink-current limits before adding load capacitance.
推荐
Logic-Level Signal Conditioning
The LT1011CH can condition a slowly varying analog signal into a clean digital transition for downstream logic. Its open-collector output supports a selectable pull-up voltage, allowing one comparator to interface with a logic family different from its supply. The manufacturer's stated improvements over the LM111 include six times lower offset voltage, four times lower bias current, and five times higher voltage gain. These characteristics can reduce ambiguity near the decision point. Account for propagation delay and output rise time in the system timing budget, keep the pull-up point close to the receiver, and confirm that the output remains off during normal input excursions.
推荐
Portable and Battery-Powered Systems
The LT1011CH is appropriate for low-power sensing and control systems where the comparator's low supply-current demand and input bias current help preserve battery life. The manufacturer datasheet identifies lower supply current than the LM111 family, while the guaranteed 25 nA maximum input bias current reduces loading from a resistive divider or sensor network. Its open-collector output allows the pull-up resistor to be tied to a low-current system rail, and it can remain active continuously for inexpensive supervision. Calculate the total standing current from the comparator, pull-up network, and external reference before assigning a duty cycle, and confirm the available supply range and common-mode limits.
推荐
推荐产品汇总
工程参考数据： LT1011CH ——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 | LT1011AH | LT1011ACH | LT1011A | LM111H | LM111H/883 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | TO-5 (8-pin) | TO-5 (8-pin) - same | TO-5 (8-pin) - same | TO-5 (8-pin) - same | TO-5 (8-pin) - same | TO-5 (8-pin) - same |
| Pin Compatibility | Compatible with LM111 series | LT1011 family | LT1011 family | LT1011A family | LM111 series compatible | LM111 series compatible |
关键差异点
- Lower input offset voltage than the pin-compatible LM111 reference family （对比 LM111H)
- Lower input bias current for high-impedance sources （对比 LM111H/883)
- Guaranteed thermal stability of the input offset （对比 LM111H)
设计说明
Do not treat the open-collector output as a push-pull logic output. Install a pull-up resistor to the receiving logic rail, and calculate the resistor using the allowed sink current, required rise time, bus capacitance, and number of wired-AND outputs. Check that the pull-up voltage remains within the device's output ratings. Failure to add the pull-up can leave the downstream node floating, while an unnecessarily low resistance can exceed the output sink-current limit.
Include the guaranteed 0.5 mV input offset voltage and 15 uV/°C offset drift in the threshold-error budget. For a temperature change of 50 °C, the drift alone can move the effective comparison point by 0.75 mV. Add the worst-case input offset, reference tolerance, noise, and resistor error rather than relying on nominal values. This is particularly important for slow threshold detection where input voltage changes can be comparable to the comparator's offset.
Keep the two comparator inputs short and route them away from relay coils, switching-power nodes, and high-current return paths. Because the LT1011CH has a guaranteed maximum input bias current of 25 nA, input leakage and contamination can still create meaningful errors with very high source impedances. Use a protective ground guard where appropriate, maintain consistent grounding between the sensor and comparator, and place the open-collector pull-up resistor close to the receiving logic input to limit rise-time distortion.
Verify the actual supply voltage, input common-mode voltage, quiescent current, and output timing in the manufacturer's electrical-characteristics table before finalizing the power budget. The comparator's open-collector stage dissipates power when the output transistor conducts, and a pull-up resistor continues to draw current while the output is low. Estimate this load from the actual pull-up voltage and resistance, then include it in battery-life calculations. Do not infer a system rail tolerance from comparator status labels.
合规信息
The Analog Devices manufacturer pages identify the LT1011 family as a production voltage comparator, but the retrieved product information does not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status for LT1011CH. The component is an analog interface IC rather than an automotive-qualified AEC-Q100 device based on the available ordering information.
