LM293AM - Dual Differential Comparator, 36 V, SOIC-8 | onsemi
MPN: LM293AM ✓ NakahandaLM293AM Ulas
A differential comparator is an analog integrated circuit that compares two input voltages and changes its output state according to their relationship. The dual configuration provides two independent comparators in one package. When used with an external pull-up, an open-collector output can drive TTL, MOS, or CMOS-compatible circuitry while also allowing wired logic, level translation, or system reset behavior. The LM293AM belongs to the comparator hierarchy within amplifier and interface ICs.
Key features include single-supply operation to 36 V, dual-supply operation to ±18 V, a typical low-current drain of 800 µA, and a typical input bias current of 25 nA. The device can compare input voltages near ground potential and is compatible with multiple logic families. Its low input bias current helps reduce source-loading effects in high-impedance sensing networks, while the wide supply range supports industrial and automotive-style control environments.
The LM293AM uses open-collector outputs rather than push-pull outputs. This architecture provides a useful advantage when a comparator output must remain inactive until an external pull-up supplies the required logic-high voltage. It also supports open-wired signal arrangements, but every application must include the appropriate pull-up resistor and verify that the resulting rise time is acceptable. The operating common-mode range, differential input limits, output sink capability, and timing behavior should be checked against the manufacturer datasheet for the selected manufacturer version.
Typical applications include industrial control systems, power-supply supervision, motor and solenoid protection, battery monitoring, sensor-threshold conditioning, window or level detection, and general-purpose logic interfaces. The dual comparator arrangement is particularly useful when one circuit monitors two related thresholds or when an enable function and a fault signal can be implemented with the two channels in a compact footprint.
For PCB design, place the device so that sensitive input traces remain away from switching nodes and output pull-up routing. Keep input and output paths separate to reduce feedback through supply or board-level coupling. Confirm the logic-high level, output rise time, input common-mode range, supply decoupling requirements, and operating temperature range before releasing the design for production.
This page combines manufacturer-family operating limits, package details, sourcing guidance, replacement analysis, and practical PCB considerations to support faster component selection. Review the complete pin assignment and electrical characteristics in the LM293AM datasheet before layout, particularly when the same circuit must accommodate multiple LM293-family variants.
Mga alternatibo na pwedeng ilagay na LM293AM — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
Variante sa Seri na ito
Katulad na modelo sa serye na katugma sa pagpasok LM293AM (parehas na form factor at footprint) — pagkakaiba sa Logic Compatibility, Output Type, Package.
LM293AD
✅ Drop-InMagkontak para sa presyo
Tingnan ang Datasheet →LM393AM
✅ Drop-InMagkontak para sa presyo
Tingnan ang Datasheet →KA393ADTF
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
LM293AM Mga Pinakamataas na Rating at Electrical Characteristics
| Comparator Type | Dual differential comparator |
| Number of Channels | 2 channels |
| Single-Supply Operating Range | Up to 36 V |
| Dual-Supply Operating Range | Up to ±18 V |
| Typical Low Current Drain | 800 µA |
| Typical Input Bias Current | 25 nA |
| Type ng Output | Open-collector, open-drain |
| Common-Mode Input Capability | Comparison of voltages near ground potential |
| Logic Compatibility | Compatible with TTL, MOS, and CMOS logic |
| Packhaging | 8-pin SOIC |
| Uri ng Pagpapasok | Surface mount |
Gabay sa Pin Configuration ng LM293AM 8-pin soic
Pin configuration para sa LM293AM (8-pin soic package). Ang analog component na ito ay may input, output, at power supply pins. Sumangguni sa datasheet ng manufacturer para sa offset null, compensation, at enable pin configurations. Perpekto para sa signal conditioning at amplifier circuits.
Wala ng detalyadong pinout data na magagamit para sa LM293AM.
Sumangguni sa datasheet para sa buong pin configuration.
Tipikal na mga Gamit
LM293AM ay nararapat para sa 6 aplikasyons: Industrial Threshold Monitoring, Motor Overcurrent Protection, Power-Supply Supervision, Battery Voltage Protection, Sensor Signal Conditioning, Logic Interface and Fault Latching.
Industrial Threshold Monitoring
The LM293AM fits industrial threshold-monitoring circuits because its two channels can independently compare process or supply voltages against reference limits. Single-supply operation to 36 V provides useful headroom for higher-voltage monitoring systems, while the typical 800 µA low-current drain reduces demand in unattended equipment. Use one channel for an upper threshold and the other for a lower threshold, add the required open-collector pull-ups, and verify that sensor and reference voltages remain within the comparator’s common-mode range. The compact 8-SOIC package also helps reduce board area in multi-channel control systems.
Inirekomenda
Motor Overcurrent Protection
LM293AM can support motor overcurrent and fault detection when the shunt-derived signal and reference voltage fit the comparator’s input limits. The dual channels allow independent monitoring of two motor or power-stage conditions, while the open-collector output can pull up a fault input or inhibit a driver. Operation from a single supply up to 36 V makes the device useful in higher-voltage control architectures, but motor transients require careful filtering and protection. Confirm the differential-input limit, common-mode range, response time, and output sink current before using the comparator directly across an unclamped motor node.
Inirekomenda
Power-Supply Supervision
The LM293AM is suitable for power-supply supervision where a divided rail voltage is compared with a reference and the fault signal must drive pulled-up logic. Its single-supply capability reaches 36 V, and the typical 25 nA input bias current reduces loading of high-impedance divider networks. The two channels can supervise positive and negative conditions independently. Place appropriate filtering at the divided input, select the pull-up voltage to match the receiving logic, and account for the open-collector output’s finite rise time when the fault signal must be captured quickly.
Inirekomenda
Battery Voltage Protection
LM293AM can implement charge, discharge, or overvoltage protection by comparing a divided battery voltage against a reference. The single-supply range up to 36 V supports many low-voltage battery systems when the sensing network keeps the pin voltage within its limits, and the low typical input bias current helps preserve divider accuracy. Open-collector outputs can drive a charge-disable or fault indicator through suitable pull-ups. Validate the actual battery voltage range, transient protection, comparator offset, and temperature behavior rather than assuming the maximum supply rating applies to the input pins.
Inirekomenda
Sensor Signal Conditioning
LM293AM can convert a slowly varying sensor signal into a logic event by comparing it with an adjustable threshold. Its typical 25 nA input bias current is useful when the sensing network has high source impedance, and the dual-channel configuration can handle two related signals or provide complementary threshold outputs. The open-collector result requires an external pull-up, allowing the output voltage to match the system’s logic level. Guard against input overvoltage, account for sensor noise through filtering or hysteresis, and verify the operating common-mode range across the full sensor excursion.
Inirekomenda
Logic Interface and Fault Latching
The LM293AM can participate in wired fault indication and logic-interface circuits because each open-collector output can be pulled up to the voltage required by the receiving logic. Two channels are useful for monitoring separate conditions or forming complementary status signals, while the broad supply range supports multiple industrial rail arrangements. Pulled-up outputs permit wired logic where multiple fault sources share a node. Select a pull-up value that satisfies the receiver’s input current while meeting the required rise time, and ensure the output remains within its absolute-maximum and sink-current ratings during fault conditions.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for LM293AM — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | LM293AD | LM393AM | KA393ADTF |
|---|---|---|---|---|
| Brand | onsemi | onsemi | onsemi | Fairchild Semiconductor |
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Comparator Configuration | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual-channel comparator |
Pangunahing mga Pagkakaiba
- Supports a higher single-supply operating ceiling (kumpara saLM393AM)
- Lower typical input bias current supports high-impedance sensing (kumpara saLM393AM)
- Dual differential channels in a compact 8-SOIC package (kumpara saKA393ADTF)
Talaan ng Disenyo
Treat the open-collector outputs as pull-up nodes rather than actively driven push-pull outputs. Select the pull-up voltage to match the receiving TTL, MOS, or CMOS interface, and verify the resistor against both input current and the required output rise time. Ensure every pull-up remains within the comparator’s output-voltage limits. This is especially important in fault systems where a slow rising edge could delay acknowledgement or fault propagation.
Keep the two input nets for each differential comparator as short as practical and avoid routing them beside high-current switching nodes. Connect the device ground pins to a low-impedance ground plane and place supply-decoupling capacitance close to the supply and ground terminals. Because the comparator can operate near ground, inspect ground offsets and return-current paths carefully; a noisy reference ground can shift the effective comparison point and create false switching.
Do not assume that the 36 V single-supply rating makes every input safe at 36 V. Check the common-mode and differential-input limits in the exact manufacturer datasheet, add clamping where necessary, and distinguish supply pins from signal pins. Also confirm the temperature grade and offset requirements before substituting another LM293-family member. A shared footprint does not by itself guarantee equivalent limits, timing, or production qualification.
Impormasyon ng Pagsunod sa Kautusan
No specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations were identified for LM293AM in the available manufacturer and distributor records.