LM293AN - Dual Open-Collector Comparator | STMicroelectronics
料号： LM293AN ✓ 量产中LM293AN 概述
A voltage comparator is an integrated circuit that compares two input voltages and produces a logic-level indication of their relationship. In this role, LM293AN belongs to the comparator IC hierarchy within analog and mixed-signal semiconductors. Each of its two channels can evaluate a non-inverting input against an inverting input, allowing one package to perform two related comparisons while keeping channel operation independent.
The LM293 family documentation identifies low power consumption as a defining characteristic and specifies input-offset voltage as low as 2.0 mV maximum for the associated two-comparator family. Open-collector outputs provide flexibility when the destination device requires a pull-up resistor, particularly in wired logic, relay-driver, and legacy digital-interface applications. The outputs are also listed as compatible with TTL, MOS, and CMOS logic families.
Operation from a single supply is central to the device design. The common-mode input range includes ground, while the differential input voltage can extend to the maximum-rated supply voltage of ±38 V according to TI's LM293 family information. The 8-DIP mechanical format provides through-hole access to the two comparator channels, power, ground, and output connections.
Typical uses include industrial control thresholds, sensor-interface decisions, window comparators, oscillator and timer designs, and general logic level conditioning. The two independent channels can also implement a larger comparator arrangement through external resistor networks. Open-collector outputs make pull-up selection an important part of the interface design because the output cannot directly drive a logic high without this external support.
The main design consideration is that open-collector outputs require correctly selected pull-up resistors and adequate logic-level rise time at the driven node. Supply decoupling, input-source impedance, output load, and common-mode headroom should be reviewed against the application's operating conditions. This page consolidates the verified device identity, package information, sourcing links, and practical comparator-selection guidance.
直接替换替代料： LM293AN ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
LM293AN 最大额定值与电气特性
| Comparator Type | General-purpose voltage comparator |
| Number of Comparators | 2 independent channels |
| 封装 | 8-DIP |
| 输出类型 | Open-collector, open-drain |
| Input Common-Mode Range | Includes ground |
| Differential Input Voltage | ±38 V maximum |
| Input Offset Voltage | 2.0 mV maximum |
| Supply Configuration | Single supply or split supply |
| Power Class | Low power |
| Logic Compatibility | TTL, MOS, and CMOS |
| Input Rail-to-Rail Classification | Rail-to-rail |
| 安装方式 | Through-hole DIP |
LM293AN 8-dip 引脚配置指南
LM293AN（8-dip 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： LM293AN.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LM293AN 适用于 6 应用s: Industrial Threshold Detection, Sensor Signal Conditioning, Window Comparator, Relay and Lamp Drive Interface, Battery Supply Monitoring, Oscillator and Timer Interface.
Industrial Threshold Detection
The LM293AN fits industrial threshold-detection circuits because it contains two independent general-purpose comparators and supports operation from a single supply with a common-mode input range that includes ground. Each channel can compare a sensor-derived voltage with a reference and produce an open-collector switching event for a controller input. The 8-DIP package also makes the device practical for through-hole industrial control boards. Because the outputs are open-collector, the design must include suitable pull-up resistors and verify the sink-current requirement against the connected load.
推荐
Sensor Signal Conditioning
LM293AN can convert a slowly changing sensor voltage into a clean digital threshold event, making it useful in monitoring and conditioning circuits. Its two independent channels allow two thresholds to be evaluated without duplicating the comparator package, while the low-power design is appropriate for compact instrumentation. The input common-mode range including ground supports sensing near the lower rail, but the exact input limits and offset performance must be checked for the operating point. External filtering may be required when the sensor output contains noise or rapid transients.
推荐
Window Comparator
The two LM293AN channels can be interconnected with resistor networks to implement an upper and lower threshold, producing an active signal only when a monitored voltage lies inside a defined window. This arrangement is useful for battery-range checks, supply sequencing tests, and signal-valid detection. The open-collector outputs allow the window state to be pulled up to the system logic level, provided the pull-up voltage remains compatible. Resistor tolerances and comparator offset determine the practical window accuracy and should be included in error-budget calculations.
推荐
Relay and Lamp Drive Interface
LM293AN is suitable for driving a relay driver, indicator, or other low-current interface when the load is connected to a supply through the open-collector output. The open-collector architecture provides a flexible interface with TTL, MOS, and CMOS logic, while a pull-up resistor establishes the inactive logic state. The 8-DIP package is convenient for legacy relay-control boards that need through-hole assembly. Designers must verify output sink current, supply voltage, and flyback protection requirements before connecting an inductive load directly to the device.
推荐
Battery Supply Monitoring
The LM293AN can monitor a battery or regulated supply and compare its voltage against a reference to generate an undervoltage or overvoltage event. Its common-mode input range including ground is useful for low-side sensing, and the low-power dual-comparator format reduces component count when monitoring more than one threshold. A pull-up resistor converts each open-collector output into a logic signal for a microcontroller or supervisor. Accurate operation requires the sensing node, reference, and supply arrangement to remain within the comparator's input and differential-voltage limits.
推荐
Oscillator and Timer Interface
LM293AN can serve as the threshold element in relaxation oscillators, debounce circuits, and simple timer stages because it provides two independent comparator channels. One channel may define an upper threshold while the other defines a lower threshold, with external resistive and capacitive networks setting timing behavior. The open-collector output can control a pull-up network and subsequent logic stage, but the pull-up value strongly affects the output rise time. Confirm response time and input limits when the timing capacitor creates fast transients or negative excursions.
推荐
推荐产品汇总
工程参考数据： LM293AN ——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 | LM293AN | LM293AN |
|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | onsemi |
| Package | 8-DIP | 8-DIP - same | 8-DIP - same |
| Comparator Count | 2 independent channels | 2 independent channels | 2 independent channels |
| Output Type | Open-collector, open-drain | Open-collector, open-drain | Open-collector, open-drain |
| Comparator Class | General-purpose | General-purpose | General-purpose |
| Input Common-Mode Range | Includes ground | Includes ground | Includes ground |
| Differential Input Voltage | ±38 V maximum | ±38 V maximum | ±38 V maximum |
| Logic Compatibility | TTL, MOS, and CMOS | TTL, MOS, and CMOS | TTL, MOS, and CMOS |
| Power Class | Low power | Low power | Low power |
关键差异点
- Two independent comparator channels in one package （对比 LM293AN onsemi sourcing option)
- Flexible open-collector interface （对比 LM293AN onsemi sourcing option)
- Single-supply operation with ground-inclusive common-mode range （对比 LM293AN onsemi sourcing option)
设计说明
Open-collector outputs do not produce a logic-high voltage by themselves. Add one pull-up resistor per output, connect it to a compatible positive supply, and verify that the high level meets the receiving logic specification. Select the resistor using the output sink-current limit, load capacitance, required rise time, and static power dissipation. The LM293AN listings identify compatibility with TTL, MOS, and CMOS logic, but those families can use different voltage thresholds.
Place the device so that comparator input traces remain away from switching nodes and relay-return paths. Keep the two channels' input routing compact and connect ground to a low-impedance plane because input offset and switching behavior can be influenced by ground current. Although the package is an 8-DIP and the architecture is simple, bypassing supply pins locally and avoiding long open-collector routes reduces susceptibility to noise and slow rising edges.
Check the comparator's maximum-rated supply voltage and the differential input limit of ±38 V before applying transient voltages. The common-mode range includes ground, but that does not mean every input combination is unrestricted. Use current limiting and clamping where an external signal could exceed the allowable input range. Because the open-collector output can sink current from its pull-up network, calculate worst-case output dissipation during a low output condition.
合规信息
No specific RoHS, REACH, lead-free, halogen-free, or conflict-minerals statement appears in the component and family pages for this product.