LT311AN8 - 30V, 200ns Voltage Comparator | Analog Devices
料号： LT311AN8 ✗ 停产LT311AN8 概述
A voltage comparator is an analog interface IC that compares two input voltages and produces a logic-level result indicating which input is higher. It belongs to the comparator hierarchy within interface and signal-conditioning semiconductors. Unlike a general-purpose operational amplifier used primarily for linear amplification, a comparator is optimized for fast saturation and switching, making it useful for threshold detection, sensor conditioning, pulse shaping, and control systems.
The LT311AN8 combines a single comparator with an 8-pin through-hole package. The verified supply specifications include 5V to 30V operation and ±2.5 V to ±15 V dual-supply operation. A 200 ns response time supports applications requiring rapid transitions, while the stated bipolar input arrangement supports operation around ground and with bipolar supplies. Exact input common-mode limits, output-swing limits, hysteresis behavior, and latch configuration were not provided in the verified data and require datasheet confirmation.
Typical circuit roles include monitoring a sensor output against a reference, detecting an overvoltage condition, converting a slowly changing analog level into a digital event, and generating a pulse when a threshold is crossed. Because a comparator output can change rapidly near its switching threshold, input noise, propagation delay, output-capacitance, and layout parasitics can affect system behavior. A stable reference and short feedback or hysteresis path may be needed when the input signal has appreciable noise or slow slew rate.
The principal design consideration is to verify supply polarity, input range, output compatibility, and logic thresholds against the actual operating rail. Do not assume that the 30 V maximum supply rating permits inputs or outputs outside the device's specified common-mode and absolute-maximum limits. Confirm that downstream devices accept the electrical output levels and that the comparator's response time is adequate for the required timing margin.
This page consolidates the verified distributor identity, package, supply, offset, response-time, and commercial-search data for LT311AN8. It also distinguishes verified facts from missing technical fields and avoids presenting unverified drop-in substitutes as guaranteed replacements, helping engineers evaluate the part with appropriate sourcing and validation caution.
直接替换替代料： LT311AN8 ——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LT311AN8 最大额定值与电气特性
| Product Type | General-purpose voltage comparator |
| Comparator Count | 1 comparator |
| Single-Supply Voltage | 5 V to 30 V |
| Dual-Supply Voltage | ±2.5 V to ±15 V |
| Maximum Input Offset Voltage | 2000 µV |
| Alternate Reported Input Offset Voltage | 1 mV at ±15 V |
| Response Time | 200 ns |
| Input Technology | Bipolar |
| Temperature Grade | Commercial |
| Terminal Form | Through-hole |
| Number of Terminals | 8 terminals |
| Package Code | DIP |
| Package Shape | Rectangular |
| 安装类型 | Through-hole |
| RoHS 状态 | unknown |
| REACH Status | unknown |
LT311AN8 rectangular 引脚配置指南
LT311AN8（rectangular 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： LT311AN8.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LT311AN8 适用于 6 应用s: Industrial Overvoltage Detection, Sensor Signal Qualification, Pulse-Width and Timing Qualification, Battery Threshold Monitoring, Audio and Amplifier Fault Detection, Power-Supply Sequence Verification.
Industrial Overvoltage Detection
The LT311AN8 fits an industrial threshold-detection stage when the monitored signal can be conditioned into its verified 5 V to 30 V supply environment. Its 200 ns response time can shorten the interval between crossing a limit and changing the state presented to a controller, while the 8-pin PDIP format supports through-hole prototyping and repair. Place a protected sensor or divider at one input and a stable reference at the other, then route the output only after checking common-mode limits and output levels from the manufacturer datasheet. The verified data does not establish the full input range, so a 24 V rail must not be applied directly to every pin without analysis.
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Sensor Signal Qualification
The LT311AN8 can convert a conditioned sensor output into a binary event when a decision speed near its verified 200 ns response is useful. Place the sensor amplifier output and a stable reference at the differential inputs, observe polarity according to the exact pinout, and add hysteresis or filtering if the source crosses the threshold slowly or contains noise. The single comparator in an 8-pin PDIP package also simplifies through-hole prototypes. Because verified common-mode limits, bias current, output swing, and supply current are absent, circuit values must remain provisional until the official datasheet is reviewed.
推荐
Pulse-Width and Timing Qualification
The LT311AN8 is relevant to pulse-width or event-duration qualification because the verified distributor specification gives a 200 ns response time. It can compare an event-derived voltage with a threshold and generate a fast state change for downstream timing logic. The comparator should be placed close enough to reduce sensitivity to long traces and noise, while its output must match the receiving device's voltage and sink-current requirements. Actual propagation delay can vary with input overdrive and supply conditions, which were not supplied, so validate worst-case timing in hardware rather than relying only on the catalog maximum.
推荐
Battery Threshold Monitoring
The LT311AN8 can support a battery-pack threshold monitor when the cell stack and sensing scheme stay within the verified 5 V to 30 V supply range. Compare a scaled pack voltage against a reference and use the 200 ns comparator response to flag rapid threshold crossings before entering a slower monitoring path. The 8-pin PDIP package is useful for a replaceable through-hole module, but protection, divider tolerances, and reference accuracy determine real trip precision. The verified maximum-offset listings differ at 2 mV and 1 mV, so this device should not set a critical protection limit until its exact datasheet conditions are confirmed.
推荐
Audio and Amplifier Fault Detection
The LT311AN8 may be used to monitor a rectified or amplified audio signal when a rapid, digital fault flag is more useful than another linear amplification stage. A divider can scale the audio-derived voltage, one comparator input receives the threshold reference, and the output identifies when the envelope exceeds the chosen level. The verified 200 ns response is short relative to many audio events, helping reduce comparator delay, but it does not by itself ensure low distortion in the preceding signal path. Confirm input common-mode behavior and output levels, and use NE5532D-class conditioning only when its noise and bandwidth requirements fit the source.
推荐
Power-Supply Sequence Verification
The LT311AN8 can act as a rail-good detector by comparing a divided power-supply voltage against a reference and driving a sequencing input or status latch. Its verified 5 V to 30 V operating range covers the nominal span of many industrial rails, and the 200 ns response can detect a transition quickly. The through-hole PDIP package makes it convenient in a backplane or controller prototype. Supply current, input common-mode limits, and output electrical state were not supplied, so rail detection must use divider scaling, hysteresis analysis, and downstream interface checks rather than direct high-voltage sensing.
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推荐产品汇总
工程参考数据： LT311AN8 ——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 | 8-pin PDIP |
| Product Type | General-purpose voltage comparator |
| Comparator Count | 1 |
| Single-Supply Voltage | 5 V to 30 V |
| Dual-Supply Voltage | ±2.5 V to ±15 V |
| Maximum Input Offset Voltage | 2000 µV |
| Response Time | 200 ns |
| Input Technology | Bipolar |
| Temperature Grade | Commercial |
| Terminal Count | 8 |
| Mounting Type | Through-hole |
关键差异点
- Fast verified response for a through-hole general-purpose comparator （对比 LM393P)
- Wide verified single-supply operating span （对比 LM311 family)
- Commercial 8-pin PDIP sourcing format （对比 LM111)
设计说明
Do not identify LT311AN8 as a drop-in equivalent merely because another part is also called a comparator. Before substitution, verify every numbered lead, input polarity, output function, supply pin, common-mode range, output pull-up or pull-down requirement, and absolute-maximum rating. The supplied excerpts identify an 8-pin PDIP but do not provide the numbered pin names, so use the manufacturer pin drawing rather than inferring connections from generic LM311-family diagrams.
Route the compared inputs as short traces and connect the device ground reference directly to the relevant analog-return network. Place input protection and any reference bypass capacitor close to their associated pins, while keeping the switching output away from high-impedance sensor inputs to reduce feedback through board capacitance. The 200 ns verified response makes fast-edge layout more important than it would be for a slow comparator; no trace lengths or ground topology can be prescribed without the complete schematic and datasheet return recommendations.
Treat crossing near the threshold as an analog decision that can produce chatter or multiple transitions. Add positive feedback for hysteresis, slow the input intentionally, or filter noise only after confirming that filtering does not invalidate the required response time. The catalog response is 200 ns, but the supplied data omits overdrive, input common-mode range, output rise and fall behavior, and supply current. Validate worst-case behavior across supply and temperature rather than deriving timing from one catalog value.
合规信息
The supplied LT311AN8 snippets do not provide RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification evidence. AEC-Q100 is recorded as not applicable because the verified listing identifies a commercial comparator, not an automotive-qualified variant.
