LM293AN - Dual Open-Collector Comparator | STMicroelectronics
MPN： LM293AN ✓ 啟用中LM293AN 概覽
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.
直接替換替代品，適用於 LM293AN — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
LM293AN 最大額定值與電氣特性
| Comparator Type | General-purpose voltage comparator |
| Number of Comparators | 2 independent channels |
| 封裝 | 8-DIP |
| 輸出類型 | 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 |
| 安裝方式 | Through-hole DIP |
LM293AN 8-dip 腳位配置指南
LM293AN（8-dip 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： LM293AN.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM293AN 適用於 6 應用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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 LM293AN — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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 |
主要差異化特點
- Two independent comparator channels in one package (對比LM293AN onsemi sourcing option)
- Flexible open-collector interface (對比LM293AN onsemi sourcing option)
- Single-supply operation with ground-inclusive common-mode range (對比LM293AN onsemi sourcing option)
設計說明
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.
合規資訊
No specific RoHS, REACH, lead-free, halogen-free, or conflict-minerals statement appears in the component and family pages for this product.