LM393PT - Dual Open-Collector Comparator | STMicroelectronics
MPN: LM393PT ✓ सक्रियLM393PT अवलोकन
A voltage comparator is an analog integrated circuit that evaluates one voltage relative to another and changes its output state when the relationship crosses a defined threshold. The LM393 belongs to the comparator IC hierarchy, which sits within interface and signal-conditioning semiconductors. Unlike an operational amplifier configured as a comparator, the LM393 integrates an open-collector output stage intended for wired logic, relay drivers, and systems that need pull-up resistors.
The principal feature of the LM393PT is its dual-channel architecture, allowing two independent comparisons in one package. Both channels use open-collector outputs, so each output can pull a logic rail low while presenting a high-impedance state when inactive. The verified distributor description identifies the device as a standard general-purpose, rail-to-rail comparator, although detailed input common-mode, output-current, timing, and supply-current limits require confirmation from the manufacturer datasheet.
The 8-pin TSSOP package supports compact PCB layouts while exposing both comparator channels, their input pins, the common supply connection, and both output pins. Because the outputs are open collector, an external pull-up resistor is normally required on each output. That arrangement supports wired-AND behavior at the logic interface and permits the output node to be pulled toward a voltage selected by the application rather than being forced to the comparator supply voltage.
Typical uses include battery-threshold detection, industrial control-interface qualification, sensor-limit switching, overvoltage and undervoltage monitoring, and general digital threshold generation. The dual-channel configuration can implement two independent alarms or form the two comparisons required by a window comparator when suitable threshold references and output logic are added.
A critical implementation consideration is the required output pull-up: omitting it leaves the open-collector output floating. Designers should also verify input voltage limits, output sink-current capability, propagation delay, input-offset behavior, and supply operating range against the STMicroelectronics datasheet before applying the comparator outside its published conditions.
This page combines verified distributor specifications and sourcing information with a package-specific pinout, drop-in replacement analysis, comparison data, and practical design guidance. It is intended to support faster component selection while clearly separating confirmed LM393PT attributes from electrical parameters that still require datasheet verification.
के लिए ड्रॉप-इन विकल्प LM393PT — समान पैकेज, पिन-टू-पिन संगत। PCB रीवर्क आवश्यक करने वाले भिन्न-पैकेज पार्ट्स शामिल नहीं हैं।
TS393
✅ ड्रॉप-इन📋 संदर्भ विकल्प (कैटलॉग में नहीं)
LM393BPT
✅ ड्रॉप-इन📋 संदर्भ विकल्प (कैटलॉग में नहीं)
LM2903BPT
✅ ड्रॉप-इन📋 संदर्भ विकल्प (कैटलॉग में नहीं)
LM393LVPT
✅ ड्रॉप-इन📋 संदर्भ विकल्प (कैटलॉग में नहीं)
LMV393PT
✅ ड्रॉप-इन📋 संदर्भ विकल्प (कैटलॉग में नहीं)
LM393PT Maximum Ratings और Electrical Characteristics
| Comparator Type | General-purpose voltage comparator |
| Number of Channels | 2 channels |
| आउटपुट प्रकार | Open-collector |
| Common-Mode Range | Rail-to-rail |
| Supply Topology | Single |
| Power Class | Low power |
| पैकेज | 8-pin TSSOP |
| माउंटिंग प्रकार | Surface mount |
LM393PT पिन कॉन्फ़िगरेशन
| पिन 1 | OUT1 — Comparator 1 open-collector output |
| पिन 2 | IN1- — Comparator 1 inverting input |
| पिन 3 | IN1+ — Comparator 1 non-inverting input |
| पिन 4 | VCC- — Ground connection |
| पिन 5 | IN2+ — Comparator 2 non-inverting input |
| पिन 6 | IN2- — Comparator 2 inverting input |
| पिन 7 | OUT2 — Comparator 2 open-collector output |
| पिन 8 | VCC+ — Positive supply connection |
सामान्य अनुप्रयोग
LM393PT के लिए उपयुक्त है 6 अनुप्रयोगs: Battery Voltage Threshold Detection, Industrial Sensor Limit Switching, Overvoltage and Undervoltage Monitoring, Open-Collector Logic Level Interface, Window Comparator for Envelope Detection, Relay and Solenoid Drive Logic.
Battery Voltage Threshold Detection
The LM393PT fits a battery threshold monitor because its dual general-purpose architecture provides two independent open-collector comparisons in one 8-pin TSSOP package. One channel can compare a divided battery voltage with an external reference and assert an alarm when the discharge limit is reached. The open-collector output can pull a pull-up rail low without requiring a dedicated logic driver. This arrangement reduces component count while retaining the rail-to-rail input description shown in the verified distributor listing. Before implementation, confirm that the battery voltage remains inside the device input range, that the selected pull-up voltage is compatible with the output stage, and that the reference and divider tolerances account for the input-offset limits published in the STMicroelectronics datasheet.
अनुशंसित
Industrial Sensor Limit Switching
The LM393PT is suitable for industrial sensor-limit switching when the sensed signal can be divided or shifted into the comparator input range. Its two channels can monitor an upper and lower threshold independently, producing separate open-collector fault outputs for a controller input. The open-collector interface is useful because each output can sink a pull-up-defined logic signal, but it cannot source current. For factory equipment, engineers should verify supply range, common-mode range, propagation delay, and input behavior across the required temperature envelope. The LM393PT should not be assumed automotive-qualified or hardened for unusual conductive environments without checking the corresponding compliance and qualification records.
अनुशंसित
Overvoltage and Undervoltage Monitoring
The LM393PT can implement a compact overvoltage and undervoltage monitor using its two independent comparator channels. Separate resistor dividers and reference nodes establish the upper and lower limits, while the open-collector outputs provide fault flags to a supervisor, relay driver, or microcontroller. Using both channels in one 8-pin TSSOP reduces footprint and assembly effort. The key engineering trade-off is that an open-collector output needs an external pull-up and has a passive high state, so the receiving device must interpret the resulting voltage correctly. Supply transients, threshold accuracy, and the behavior of both inputs outside their normal operating range must be reviewed in the manufacturer datasheet before applying the device to safety-related protection.
अनुशंसित
Open-Collector Logic Level Interface
The LM393PT can translate or adapt logic levels by comparing an input signal with a reference and driving an open-collector output to a separately selected pull-up voltage. This arrangement is useful when a controller cannot directly accept the voltage or polarity of an external signal. Because the output is open collector, it provides wired-AND capability and avoids actively driving the connected bus high. The interface design must include a pull-up resistor sized from the verified output sink current, logic thresholds, and signal rise-time requirements. For a new low-power design, the TS393 candidate may reduce supply consumption, while the LM393PT benefits from its established LM393-family pinout and existing component approvals.
अनुशंसित
Window Comparator for Envelope Detection
The two LM393PT channels can be combined to create a window comparator that identifies whether a monitored voltage lies between a lower and an upper limit. Each channel compares the input against one threshold, and the system interprets the two open-collector outputs together. This topology is useful for signal-presence tests, supply envelopes, and analog input qualification. Its practical limitation is that both outputs require pull-up resistors and that threshold accuracy depends on the input-offset characteristics, reference stability, and resistor tolerances. The verified data confirms the dual-channel, open-collector, rail-to-rail general-purpose architecture, but it does not provide the detailed timing or common-mode limits needed for a production design.
अनुशंसित
Relay and Solenoid Drive Logic
The LM393PT can serve as the decision stage preceding a relay or solenoid driver because its open-collector output can sink current into the input of a suitable driver circuit. It is useful where a sensor threshold must be converted into an enable or fault signal before handling a higher-current load. The comparator itself should not be assumed to drive a relay coil directly; the relay's coil current, inductive kickback, isolation, and supply requirements need a separate driver and protection network. The LM393PT's two channels can monitor two independent conditions, such as an enable command and a fault indication. Verify output saturation, supply range, and temperature behavior in the manufacturer documentation before integrating the part into power-conversion or safety-related paths.
अनुशंसित
अनुशंसित उत्पादों का सारांश
के लिए इंजीनियरिंग संदर्भ डेटा LM393PT — तुलना, डिज़ाइन मार्गदर्शन और अनुपालन जानकारी।
चयन गाइड
विकल्पों के साथ तुलना
| पैरामीटर | यह उत्पाद | TS393 | LM393BPT | LM2903BPT | LM393LVPT | LMV393PT |
|---|---|---|---|---|---|---|
| Package | TSSOP-8 | TSSOP-8 | TSSOP-8 | TSSOP-8 | TSSOP-8 | TSSOP-8 |
| Brand | STMicroelectronics | STMicroelectronics | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Comparator Count | 2 channels | 2 channels | 2 channels | 2 channels | 2 channels | 2 channels |
| Output Type | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector |
मुख्य विशेषताएँ
- Dual independent channels in a compact surface-mount package (बनामTS393)
- Established STMicroelectronics LM393 family sourcing (बनामLM393BPT)
- Open-collector output supports flexible pull-up logic (बनामLM2903BPT)
डिज़ाइन नोट्स
Every LM393PT output requires an external pull-up resistor because the open-collector transistor can sink current but cannot source a high level. Select the resistor to produce a valid receiver-high voltage while remaining within the comparator's output sink-current rating at the actual logic-low current. Place the pull-up near the receiving device when rise time matters, and do not treat the output as push-pull logic. The supplied data does not include the sink-current limit, so final resistor sizing requires the STMicroelectronics datasheet.
Route the LM393PT power and ground pins directly to the supply planes or a quiet local return path, and keep the open-collector traces short to minimize susceptibility to coupling and slow edges from excessive pull-up resistance. If the comparator evaluates a small sensor signal, place its input resistors and reference components close to pins 2, 3, 5, and 6, while keeping the switching output and pull-up network physically separated from sensitive input traces. A solid ground plane and short return path help prevent output transitions from injecting error into the threshold signal.
The LM393PT is a single-supply comparator, so its supply voltage must remain within the manufacturer-rated range during startup, shutdown, and normal operation. Do not infer the permissible voltage from the rail-to-rail input description. Add local supply bypassing close to pin 8 with a return to the ground plane, and use the ground pin as the common reference for both channels. If the input source can exceed the supply rail during fault conditions, add external clamping or protection rather than relying on an undocumented input clamp.
अनुपालन जानकारी
The supplied verified data does not provide explicit LM393PT compliance declarations. Compliance and qualification status must be confirmed from the current STMicroelectronics product documentation or distributor records.
