LM293N - Dual Open-Collector Comparator, 8-DIP | STMicroelectronics
MPN： LM293N ✗ 停產LM293N 概覽
A voltage comparator is an analog semiconductor that compares two input voltages and produces a logic-level indication of their relationship. The LM293N contains two independent comparators, allowing one package to implement threshold detection, window comparison, free-running oscillator, or simple analog-to-logic conversion. Within the broader hierarchy, it is a comparator IC, then an analog integrated circuit, and finally a semiconductor. Its open-collector outputs can sink external current and normally require a pull-up resistor when the design expects a high-level output.
The primary documented feature is its ability to operate from a single supply over a wide range of voltages, with split-supply operation also supported. The two independent channels provide design flexibility for comparing a sensor against a reference, checking a power rail, or generating complementary decisions in control circuitry. The open-collector architecture can support wired logic and level translation, but the external pull-up, output current, propagation delay, and input common-mode limits must be checked against the actual datasheet.
LM293N is suitable for industrial control, instrumentation, power-supply supervision, sensor interfaces, and embedded threshold detection. In a single-supply circuit, place the input network so that the signal remains within the device's verified common-mode range. In a split-supply circuit, confirm the positive and negative rail limits and the permitted total voltage. Because the provided data does not state absolute maximum ratings, supply voltage, input offset, output-current capability, response time, or operating temperature, those values should not be assumed.
Design practice should include a local bypass capacitor, a defined pull-up resistor for each open-collector output, and protection for exposed sensor inputs. Avoid relying on an output high level until the pull-up network and downstream load have been analyzed. Verify input polarity, output inversion, hysteresis, and logic compatibility with the system controller. The 8-DIP package is mechanically important: use the manufacturer pinout and maintain adequate lead spacing during assembly.
This page combines the verified LM293N product identity, package information, application context, datasheet links, and engineering considerations. It intentionally does not fabricate electrical ratings, pricing, lifecycle claims, or unreported pin names; obtain the current manufacturer datasheet and distributor quotation for production decisions.
直接替換替代品，適用於 LM293N — 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。
此系列的變體
與下列產品可直接替換的同系列型號： LM293N （相同外形與佔位） — 差異在於 Package, Output Type, RoHS Status, Comparator Type, Common-Mode Input Range.
LM393N
✅ 直接替換聯絡詢價
查看資料表 →LM2903N
✅ 直接替換聯絡詢價
查看資料表 →LM2902N
✅ 直接替換聯絡詢價
查看資料表 →LM293N 最大額定值與電氣特性
| Comparator Configuration | Dual independent comparator |
| Number of Channels | 2 channels |
| 輸出類型 | Open-collector |
| Supply Configuration | Single supply or split power supplies |
| Input Function | Differential voltage comparison |
| 封裝 | 8-DIP |
| 安裝類型 | Through-hole |
| Logic Compatibility | External pull-up required for open-collector output |
| RoHS 狀態 | unknown |
| REACH Status | unknown |
LM293N 8-dip 腳位配置指南
LM293N（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： LM293N.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM293N 適用於 6 應用s: Industrial Threshold Detection, Power-Supply Supervision, Sensor Interface and Conditioning, Battery and Automotive Monitoring, Relay and Actuator Decision Logic, Simple Window Comparator.
Industrial Threshold Detection
The LM293N fits industrial threshold-detection circuits because it provides two independent comparators for monitoring two sensor or supply conditions in one 8-DIP package. Each channel can compare an input signal with a reference and produce a pulled-up logic indication for a controller. The verified data confirms single- or split-supply use, but the actual common-mode range, supply limits, offset, and response time must come from the manufacturer datasheet. Add input filtering for noisy industrial signals and select a pull-up resistor based on the controller input current and required transition speed.
推薦
Power-Supply Supervision
LM293N can supervise a power rail when two independent comparison channels are useful for detecting an upper or lower threshold, or for combining two supervisory events into a system status input. Its single-supply operation is suitable conceptually for comparator-based monitoring, while split-supply operation supports bipolar sensing arrangements. The pull-up output should be selected to match the supervisor input. Before deployment, verify the device's absolute maximum supply voltage, input common-mode limits, input offset, output sink current, and behavior during startup or supply droop.
推薦
Sensor Interface and Conditioning
The two independent LM293N channels are useful when a sensor needs separate high-limit and low-limit decisions, allowing a controller to receive a simple pulled-up status rather than processing the analog signal directly. Place the sensor and reference network close enough to control noise, then confirm that the sensor voltage remains inside the comparator's verified common-mode range. Hysteresis or positive feedback can help prevent chatter when the signal crosses the threshold, but resistor values and timing must be calculated from the actual datasheet characteristics and system noise requirements.
推薦
Battery and Automotive Monitoring
LM293N can support battery or vehicle monitoring functions when its supply and input ratings match the system voltage and transient environment. The dual-channel architecture can compare two battery thresholds or combine a voltage condition with another status signal. Automotive use requires checking transient immunity, temperature grade, and manufacturer qualification rather than assuming that a generic 8-DIP comparator is suitable. The provided data does not state automotive qualification or absolute maximum ratings, so those items must be verified before a vehicle design is released.
推薦
Relay and Actuator Decision Logic
LM293N can drive decision logic for relays, solenoid controls, or actuator enable signals when the downstream interface accepts an open-collector pull-up and the comparator's verified sink-current capability is adequate. The output should not be assumed to source actuator current directly; use a suitable driver stage and protection network. Keep sensitive comparator traces away from relay-coil wiring, add flyback protection where required, and verify that the output-low voltage remains valid at the maximum coil or load current.
推薦
Simple Window Comparator
Both LM293N channels can be combined to form a window or range detector, with one channel establishing the lower threshold and the other establishing the upper threshold. The controller can then determine whether the monitored voltage lies within the permitted interval. This application benefits from the package's two independent channels, but logic inversion and output states must be checked carefully. Add hysteresis around each threshold and test startup, tolerance, and input-noise behavior. The verified data does not provide offset or delay values, so threshold accuracy and response timing require datasheet-based calculations.
推薦
推薦產品摘要
工程參考資料，適用於 LM293N — 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 | LM393N | LM2903N | LM2902N | LM2904N | LM339N |
|---|---|---|---|---|---|---|
| Comparator Configuration | Dual independent comparator | Dual comparator; exact family details require datasheet | Dual comparator; exact family details require datasheet | Dual comparator; exact family details require datasheet | Dual amplifier; comparator equivalence not verified | Quad comparator family; channel count differs |
| Package | 8-DIP | 8-DIP | 8-DIP | 8-DIP | 8-DIP | 8-DIP |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
主要差異化特點
- Two independent comparator channels in one 8-DIP package (對比LM339N)
- Single- or split-supply operating concept (對比LM2903N)
- Open-collector interface for pulled-up logic (對比LM2902N)
設計說明
Because the verified data does not provide supply-voltage or current ratings, treat the supply limits as datasheet-controlled constraints rather than design assumptions. Confirm the maximum total supply voltage, input common-mode range, quiescent current, and output sink current before selecting rails or pull-up resistors. Add local supply bypassing near the device and check the capacitor voltage rating against the highest transient seen on the PCB.
Route the comparator input and reference nets away from switching nodes, relay-coil wiring, and high-current return paths. Keep the device ground connection short and connect the input bias or filter components close to the relevant pins. Because the supplied pinout is unavailable, use the manufacturer diagram for physical placement rather than inferring pin numbering from the DIP outline.
Do not leave the open-collector output without a defined pull-up unless the next stage intentionally uses wired-open logic. The resistor must satisfy the downstream input's current and capacitance requirements while keeping the output-low voltage within its specified limit. Also avoid assuming that a related LM393N or LM2903N is a drop-in replacement; verify pinout, supply range, common-mode range, offset, timing, and output current.
合規資訊
The supplied verified product and distributor pages do not provide reliable compliance statements for this exact ordering code.