LT111AH Military Voltage Comparator | Analog Devices
料号： LT111AH ✗ 停产LT111AH 概述
A voltage comparator is an analog integrated circuit that compares two input voltages and changes its output when the difference crosses a defined threshold. Within the broader semiconductor hierarchy, a comparator belongs to the linear IC family and the amplifier IC category. Unlike a general-purpose operational amplifier, its principal purpose is fast, deliberate state transition according to the polarity of its differential input rather than linear amplification.
The LT111AH is associated with the LT111 comparator family and is offered in a military temperature grade. The H suffix distinguishes this ordering code from other package, temperature, or accuracy variants, but the supplied excerpts do not expose the underlying ordering-code table needed to state every suffix characteristic. Its TO-5 construction uses wire-form leads and suits legacy or ruggedized assemblies where a through-hole metal package is preferred. The round package also requires care during insertion because lead orientation determines correct comparison-input and output connections.
Verified distributor records classify the part as a comparator and show commercial listings through DigiKey, Octopart, Xecor, and other suppliers. The available Cytech Systems result reports zero stock and $0.0000 reference prices, so those values cannot be interpreted as a usable quotation. The Linear Technology page indexed by linear-electronic.com reports 3,320 pieces in stock, but that vendor record is not treated as an authoritative global stock figure. Pricing and availability should therefore be confirmed at order time.
The LT111AH can be evaluated for industrial control, instrumentation, alarm detection, and legacy equipment, provided the system supply stays within the family limits. External resistors and protection networks may be needed to constrain inputs or accelerate an open-collector output, but exact values cannot be selected responsibly without verified input thresholds, output architecture, supply range, and timing specifications. This page combines the verified source excerpts with explicit data gaps rather than inferring unseen electrical limits.
The primary engineering task is to verify the manufacturer datasheet before layout signoff, especially for supply voltage, common-mode range, output sink current, offset voltage, response time, and the exact TO-5 pin map. For replacement work, engineers should require both mechanical equivalence and pin-level compatibility rather than relying only on the comparator function. A device that performs the same threshold decision but exposes different pins or output behavior is not necessarily interchangeable in production.
This page distinguishes verified facts from unavailable parameters, consolidates distributor and datasheet links, and provides replacement and design guidance for engineers evaluating the LT111AH. Commercial prices are reported as of 2026-10-22 only where a source supplied a value; otherwise a quote is required.
直接替换替代料： LT111AH ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
该产品暂无直接替换替代料。
请求替代料LT111AH 最大额定值与电气特性
| Product Type | IC voltage comparator |
| Manufacturer | Analog Devices |
| Number of Channels | 1 channel |
| Temperature Grade | Military |
| Maximum Operating Temperature | 125 °C |
| 封装 | TO-5, round |
| Terminal Count | 8 terminals |
| Terminal Form | Wire |
| RoHS 状态 | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | not_applicable |
LT111AH to-5, round 引脚配置指南
LT111AH（to-5, round 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： LT111AH.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LT111AH 适用于 6 应用s: Legacy Industrial Control Systems, Sensor Threshold Detection, Power Supply Window Supervision, Test and Measurement Instruments, Alarm and Fault Detection, Aerospace and Rugged Electronics.
Legacy Industrial Control Systems
The LT111AH can support threshold decisions in legacy industrial control equipment where an 8-terminal TO-5 comparator is already supported by the PCB and qualified supply chain. Its military temperature grade and stated 125 °C maximum operating temperature make it relevant to equipment expected to operate above ordinary commercial-temperature limits. Before fitting it into a control loop, verify the actual supply range, input common-mode limits, propagation delay, and output architecture from the manufacturer datasheet. Those missing values determine whether the comparator can safely monitor a control node without saturating or introducing unacceptable switching delay.
推荐
Sensor Threshold Detection
LT111AH can evaluate a sensor-derived voltage against a reference when the application already uses the LT111 family's TO-5 implementation. The comparison function is appropriate for detecting upper or lower limits, but the available records do not provide offset voltage, input noise, response time, or common-mode limits. Those characteristics control false triggering near the threshold and behavior during sensor transitions. The circuit must therefore include reference and protection design only after the complete electrical table has been checked against the sensor's output swing and operating temperature.
推荐
Power Supply Window Supervision
A LT111AH-based circuit may compare a generated supply or divided supply node with a reference to identify an out-of-range condition. The military-grade designation and 125 °C maximum operating temperature are relevant for rugged equipment, but the source excerpts do not establish whether the LT111AH output can directly drive supervisor logic or how its supply range aligns with the monitored rails. Confirm input limits and output topology first. A pull-up may be needed if the device uses an open-collector output, but that arrangement must be verified rather than assumed from the related LT311AH record.
推荐
Test and Measurement Instruments
LT111AH can be evaluated for threshold or polarity decisions in legacy test equipment that accepts a wired round TO-5 comparator. Its military grade may support extended-temperature calibration or service applications, subject to confirmation of the complete temperature interval. The excerpts do not provide response time, input offset, noise, or output-drive data, all of which affect measurement resolution and settling behavior. Preserve the original circuit topology where possible and compare those parameters with the original instrument specification to prevent a functionally similar comparator from changing measurement accuracy or triggering behavior.
推荐
Alarm and Fault Detection
The LT111AH comparator function fits an alarm or fault detector that changes state when a monitored analog voltage crosses a selected level. In transportation or safety-adjacent equipment, its listed military grade can be advantageous, but suitability must be established against the required temperature range and failure-response criteria. Since the verified excerpts omit common-mode limits and propagation delay, they cannot establish detection speed or safe input tolerance. Keep input voltages within verified limits and qualify the complete alarm path before using the part as the sole basis for protective action.
推荐
Aerospace and Rugged Electronics
LT111AH may be relevant to rugged or aerospace-oriented maintenance hardware because its records identify a military temperature grade, a 125 °C maximum, and a wired TO-5 construction. Those attributes can help preserve compatibility with older high-reliability assemblies, although military grade in a distributor description does not by itself establish a particular qualification program or traceability level. Review the manufacturer ordering table, operating-temperature range, package drawing, and screening options. New aerospace designs should also evaluate newer low-noise, rail-to-rail comparators if PCB redesign is acceptable.
推荐
推荐产品汇总
工程参考数据： LT111AH ——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 |
|---|---|
| Brand | Analog Devices |
| Package | TO-5, round |
| Product Type | IC voltage comparator |
| Channel Count | 1 channel |
| Temperature Grade | Military |
| Maximum Operating Temperature | 125 °C |
| Terminal Count | 8 terminals |
| Terminal Form | Wire |
| Reference Price at Quantity 1 | $0.0000 as of 2026-10-22; Cytech reference price only |
| Verified Availability | Vendor records conflict |
关键差异点
- Legacy-compatible metal-can construction （对比 LM393P)
- Military temperature designation （对比 LM311)
- Single-comparator function in an 8-terminal package （对比 LM339N)
设计说明
Do not treat LT111A, LT311AH, LM311, or NTE922 as drop-in substitutes based only on comparator function. The supplied results do not verify an identical 8-terminal TO-5 pin map, common-mode range, output architecture, or military temperature grade. Before replacing LT111AH, compare the manufacturer package drawing and every electrical limit, then test threshold polarity, output state, saturation behavior, and timing in the actual circuit.
Confirm the physical pin-1 orientation and all eight TO-5 connections before inserting the comparator. The verified excerpts establish wire leads and a round package but do not provide the numbered pin map. Preserve the original lead spacing, hole size, and copper clearance where possible, and route sensitive comparison inputs away from switching nodes. Any input divider or protection network must be calculated only after the supply and common-mode limits are confirmed.
A comparator output network cannot be finalized until its output type and current rating are verified. If the LT111AH uses an open-collector output, an external pull-up controls the logic-high level and output rise time; if it uses a totem-pole output, a pull-up may be inappropriate. Check the manufacturer output section, choose resistor values from the verified sink-current and capacitance limits, and account for system-level 5 V or legacy logic thresholds.
合规信息
The supplied excerpts identify military temperature grade but do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. No environmental or automotive compliance claim is inferred from the military-grade description.
