LM393AD - Dual Open-Collector Comparator | Texas Instruments
MPN: LM393AD ✓ AktifLM393AD Ringkasan
A comparator is an analog integrated circuit that determines whether an input voltage is above or below a reference level and then represents that decision through a logic output. In the product hierarchy, the LM393AD is a dual comparator, which is a type of analog comparator and therefore part of the broader comparator IC and interface IC categories. Unlike an operational amplifier configured as a comparator, this dedicated device provides predictable switching behavior for applications in which the input frequently crosses a threshold. Two channels in one package can monitor two signals or implement complementary decisions while reducing board area.
The most important verified features are the dual-channel configuration, open-collector output topology, and wide differential input capability. Each output can sink current and requires an external pull-up resistor when a valid high output level is required. The listed compatibility with TTL, MOS, and CMOS outputs allows the device to interface with multiple logic families. Because the common-mode input range includes ground, the LM393AD is suitable for circuits whose signal or reference is near 0 V. The manufacturer identifies the family as a commercial-grade dual differential comparator, and the verified technical listing specifies an 8-SOIC package.
Electrically, the LM393AD compares two input voltages at each channel and controls an open-collector output transistor. The output remains high impedance when the transistor is off, so the external pull-up network determines the high voltage. This architecture supports wired logic, relay drivers, lamp drivers, and level translation, provided that pull-up current and output sink current remain within the device limits. The maximum differential input voltage is stated as plus or minus 38 V, but that value is not a substitute for the specified operating supply range. Supply voltage, input offset voltage, response time, output sink current, and electrical limits must therefore be confirmed from the manufacturer datasheet before final design release.
Typical applications include industrial sensor thresholds, battery and power-supply monitoring, overvoltage detection, temperature-control signals, window comparators, and logic interfaces requiring an open-collector output. The dual configuration is useful when two independently adjustable thresholds must be evaluated, such as upper and lower battery limits. In a two-threshold system, one channel can detect overvoltage while the other detects undervoltage, allowing a system controller to distinguish safe, low, and high operating states.
A key design consideration is the external pull-up resistor. Its value determines output rise time, bus speed, and the current required when the output transistor is off. The pull-up should connect only to a voltage that the output and downstream logic can tolerate. The input network must also prevent either differential input from exceeding the plus or minus 38 V differential limit. Designers should verify the exact SOIC-8 pin mapping, supply range, common-mode limits, and output-current limits in the manufacturer datasheet before assembly because those details were not present in the supplied verified excerpts.
This page consolidates the verified manufacturer and distributor information for the LM393AD, distinguishes its defining dual open-collector characteristics, documents the evidence gaps without inventing missing values, and identifies the verified STMicroelectronics drop-in alternative. It also adds practical design guidance for pull-up selection, threshold implementation, and cross-brand sourcing.
Alternatif penggantian untuk LM393AD — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
LM393AD
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Lihat Datasheet →LM393AD Rating Maksimal & Karakteristik Listrik
| Comparator Type | Dual differential comparator |
| Number of Channels | 2 channels |
| Tipe Output | Open collector |
| Common-Mode Input Range | Includes ground |
| Differential Input Voltage Range | -38 V to +38 V |
| Output Compatibility | TTL, MOS, and CMOS |
| Application Grade | Commercial grade |
| Paket | 8-SOIC |
| Tipe Mounting | Surface mount |
| Rentang Suhu Kerja | 0 C to +70 C |
LM393AD 8-soic Diamant Konfigurasi Panduan
Konfigurasi pin untuk LM393AD (8-soic pakai pakai). Komponen analog ini memiliki pin masukan, keluaran, dan pengirim daya. Lihat datasheet produsen untuk konfigurasi pin offset null, kompensasi, dan pengaktifan. Ideal untuk peralatan sinyal dan kabel penggandaran.
Tidak ada data diatribut pin yang tersedia untuk LM393AD.
Lihat ke: datasheet produk untuk konfigurasi pin penuh.
Aplikasi Umum
LM393AD cocok untuk 6 aplikasis: Industrial Sensor Threshold Detection, Battery Voltage Window Monitoring, Overvoltage and Fault Protection, Temperature-Control Signal Conditioning, Logic-Level and Relay Interface, Digital Communication Line Receiver.
Industrial Sensor Threshold Detection
The LM393AD fits industrial sensor threshold detection because its common-mode input range includes ground, allowing a sensor-derived signal near 0 V to be compared with a reference. Each of the 2 channels can establish an independent switching point for limit or alarm decisions. The open-collector output can pull a controller input low, while an external pull-up defines the inactive high state. Because the device is a commercial-grade comparator, the selected package variant and operating temperature must remain within the design envelope. Confirm the full input limits and output sink current from the manufacturer datasheet before using the part in a safety-critical alarm path.
Direkomendasikan
Battery Voltage Window Monitoring
The LM393AD is useful for battery undervoltage and overvoltage window monitoring because it provides 2 comparator channels in one 8-SOIC package. One channel can establish the lower threshold and the other the upper threshold, allowing a system controller to distinguish an undervoltage, valid, or overvoltage condition. Its differential input range extends to -38 V to +38 V, but the actual operating supply and absolute input limits must still be checked in the datasheet. Open-collector outputs simplify wired alarm signaling with pull-up resistors, although the resistor and logic voltage must respect the output-current limits.
Direkomendasikan
Overvoltage and Fault Protection
The LM393AD can implement an overvoltage or fault detector by comparing a scaled supply rail against a reference and driving an open-collector fault output when the limit is exceeded. Its common-mode input range that includes ground supports low-voltage threshold circuits, while the open-collector topology allows the fault node to remain active during a reset condition. An external pull-up is required to generate a valid high level. Before implementation, verify the exact supply range, response time, output saturation, and sink-current limits from the manufacturer datasheet because those values were not present in the supplied excerpts.
Direkomendasikan
Temperature-Control Signal Conditioning
The LM393AD is applicable to temperature-control signal conditioning when a thermistor, RTD front end, or sensor amplifier produces a voltage that must be compared with a setpoint. Two channels can support independent heating and cooling decisions or provide hysteresis around a control threshold. The comparator's direct first-sentence threshold action avoids operating an operational amplifier in saturation, and its open-collector output can drive a relay-driver stage through suitable interface circuitry. The 0 C to +70 C operating range associated with the commercial-grade LM393AD should be checked against the intended control environment.
Direkomendasikan
Logic-Level and Relay Interface
The LM393AD can serve as a logic interface because its open-collector outputs are compatible with TTL, MOS, and CMOS according to the verified Texas Instruments product information. The output can pull a wired logic bus low when the comparison condition is met, while an external pull-up establishes the high state and permits several open-collector devices to share a bus. This is useful for relay, lamp, or interlock signaling when the attached load includes a suitable driver and flyback protection. Pull-up current, output sink current, and the attached transistor or relay coil must all be checked against the device limits.
Direkomendasikan
Digital Communication Line Receiver
The LM393AD can participate in a digital communication line receiver when incoming data is biased into the comparator's common-mode region and referenced against a threshold. The device then produces a clean open-collector data indication suitable for pull-up termination and subsequent digital processing. Its differential input capability and ability to compare a signal near ground are relevant to low-voltage communications. Designers must confirm propagation delay, input offset, noise behavior, and supply range in the manufacturer datasheet, and must account for pull-up rise time when setting the receiver's maximum data rate.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk LM393AD — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | LM393AD |
|---|---|---|
| Package | 8-SOIC | 8-SOIC |
| Brand | Texas Instruments | STMicroelectronics |
| Comparator Configuration | Dual differential comparator | Dual general-purpose comparator |
| Number of Channels | 2 channels | 2 channels |
| Output Type | Open collector | Open collector |
Diferensiator Kunci
- Verified dual open-collector architecture (vsSTMicroelectronics LM393AD)
- Single-package dual-channel implementation (vsSingle-channel comparator alternatives)
- Ground-referenced input capability (vsComparators with restricted ground-side common-mode range)
Catatan Desain
Do not assume that an open-collector output can independently drive a valid high level. Add an external pull-up resistor from the output node to an approved logic supply, and verify that the pull-up current, output leakage, and sink-current limits remain acceptable. Also check both inputs against the specified -38 V to +38 V differential range; the equal-to-supply differential statement on the manufacturer product page does not authorize applying arbitrary voltage differences.
Place the LM393AD close to the sensed or reference nodes to reduce susceptibility to pickup on high-impedance comparator inputs. Route sensitive input and reference nets away from switching-node and power-converter traces, use a continuous ground reference, and keep pull-up resistors near the output pins when fast edge rates are important. The supplied evidence confirms the 8-SOIC package but does not provide the manufacturer pin diagram, so verify the final pin assignments against the current datasheet before routing.
Select the external pull-up voltage and resistor together so that the resulting high level meets the receiving TTL, MOS, or CMOS input threshold while remaining within the comparator output limits. A lower pull-up resistance produces a faster rising edge but consumes more current when the transistor is off; a higher resistance reduces current but slows the edge and increases susceptibility to noise. Verify the actual sink current and output saturation voltage from the manufacturer datasheet before fixing the value.
Informasi Konformitas
The supplied verified excerpts do not contain explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations. AEC-Q100 is marked not applicable because the device is described as commercial grade rather than an automotive-qualified variant.
