LM393APWRE4 - Dual Open-Collector Comparator | Texas Instruments
MPN: LM393APWRE4 ✓ פעילLM393APWRE4 סקירה
A comparator is an analog integrated circuit that evaluates one input voltage against another and changes its output state when the difference crosses a defined threshold. The LM393 belongs to the comparator hierarchy within analog and mixed-signal semiconductors. Unlike an operational amplifier used primarily for closed-loop amplification, this device provides a saturated digital decision at its output. Each channel can also be used as an open-loop line receiver or simple threshold detector.
Key features include two independent channels, an open-collector output architecture, a supply voltage range extending to 30 V, and a typical propagation delay of 0.3 us. The listed supply-current drain is 0.4 mA typical per comparator, making the device suitable for battery-powered monitoring systems where continuous current matters. The differential inputs allow a signal to be compared against a reference voltage, while the package reduces board area compared with discrete transistor implementations.
The LM393 family uses open-collector transistor outputs rather than totem-pole outputs. When the output transistor turns off, the output node rises only as allowed by the external pull-up network. This architecture provides a useful advantage in systems that need a shared bus, wired logic, level translation, or compatibility with a higher supply domain. The output transistor can sink current from the pull-up rail while the collector remains physically isolated from the device supply pins.
Typical uses include DC overvoltage and undervoltage detection, sensor threshold conditioning, window comparators, battery monitoring, zero-cross detection, and industrial control interfaces. Two independent channels can implement separate upper and lower thresholds, or they can be combined into a window-comparator function. Open-collector outputs also permit several comparator outputs to share a pull-up when the system requires a wired-AND arrangement.
When designing a circuit, choose the pull-up resistor so that its worst-case sink current stays within the output-transistor limit and its rise time remains acceptable for the downstream logic. Keep input traces short, provide a stable reference source, and connect the unused comparator channel to a defined common-mode voltage. The 8-TSSOP package requires careful lead inspection because its closely spaced leads can be difficult to inspect after soldering.
This product page combines the device specifications, application guidance, drop-in alternatives, and practical comparator-layout considerations. These engineering details help designers evaluate the LM393APWRE4 against other dual open-collector comparators without treating package size and pin compatibility as substitutes for complete electrical verification.
חלופות תחליף ישיר עבור LM393APWRE4 — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
LM393BIPWR
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
LM393APWR
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
LM393APWRQ1
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
LM2903PWR
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
LM2903PWRQ1
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
LM393APWRE4 דירוגים מרביים ומאפיינים חשמליים
| Comparator Type | Dual differential general-purpose comparator |
| Number of Channels | 2 channels |
| Supply Configuration | Single supply or split supply |
| Maximum Supply Voltage | 30 V |
| סוג פלט | Open-collector |
| Rail-to-Rail Output | Rail-to-rail open-collector output |
| Propagation Delay | 0.3 us |
| Supply Current Drain | 0.4 mA typical per comparator |
| Input Configuration | Differential inputs |
| מארז | 8-TSSOP |
| Package Width | 4.40 mm |
| סוג הרכבה | Surface mount |
תצורת פינים של LM393APWRE4
| פין 1 | OUT1 — Comparator channel 1 open-collector output |
| פין 2 | IN1- — Comparator channel 1 inverting input |
| פין 3 | IN1+ — Comparator channel 1 non-inverting input |
| פין 4 | GND — Ground connection |
| פין 5 | IN2+ — Comparator channel 2 non-inverting input |
| פין 6 | IN2- — Comparator channel 2 inverting input |
| פין 7 | OUT2 — Comparator channel 2 open-collector output |
| פין 8 | VCC — Positive supply connection |
יישומים טיפוסיים
LM393APWRE4 מתאים עבור 6 יישוםs: Battery Overvoltage and Undervoltage Detection, Industrial Sensor Threshold Conditioning, Power Supply Sequence Monitoring, Wired-AND Fault Bus, Battery-Powered Equipment Monitoring, Level and Reference Cross-Check.
Battery Overvoltage and Undervoltage Detection
The LM393APWRE4 suits dual-rail battery protection because it contains two independent differential comparator channels and has a listed supply-current drain of 0.4 mA typical per comparator. A resistor divider can scale the battery voltage to each input, while one channel detects overvoltage and the other detects undervoltage. Both open-collector outputs can pull down separate fault lines or share a pull-up when a combined fault indication is acceptable. The 30 V maximum supply provides useful headroom for many industrial battery systems, although the exact charging voltage, input common-mode range, divider resistance, and reference accuracy must remain within the selected grade's limits.
מומלץ
Industrial Sensor Threshold Conditioning
The LM393APWRE4 can convert a slowly varying industrial sensor signal into a clean logic decision when its differential inputs are connected to the sensor and a reference voltage. The 0.3 us listed propagation delay is sufficient for many threshold-detection and alarm circuits, while the open-collector output provides flexibility for driving an optocoupler, relay-control input, or pulled-up logic. Two independent channels can compare the same sensor with upper and lower limits or monitor two different sensors. Because the device is intended for industrial environments, designers should still verify input offset, common-mode limits, noise behavior, and temperature-grade requirements for the deployed equipment.
מומלץ
Power Supply Sequence Monitoring
The LM393APWRE4 is useful in power-system monitoring because two independent channels can compare divided rail voltages with references and create separate power-good or fault indications. Its 30 V maximum supply rating suits supervisory functions around many 12 V, 24 V, and lower-voltage industrial rails, while the open-collector outputs can directly pull down an enable line or assert a system fault through a pull-up. The 0.3 us response time allows prompt reaction to rail changes, but the actual power-sequencing delay may be dominated by divider capacitance, filtering, and the receiving logic. Confirm the input range and pull-up voltage before using the comparator outside its rated operating envelope.
מומלץ
Wired-AND Fault Bus
The LM393APWRE4 open-collector output architecture is well suited to a shared fault bus because each output can pull the same node low and release it when inactive. Two channels can monitor two conditions, with one external pull-up establishing the bus high state and both outputs wired together when a combined alarm is required. This arrangement simplifies open-drain signaling across several subsystems and avoids forcing multiple outputs into a conflicting high state. The resistor must be selected to satisfy the worst-case total sink current while preserving the required rise time. Review the manufacturer output-current and transition specifications, and account for line capacitance when the fault bus covers a broad PCB area.
מומלץ
Battery-Powered Equipment Monitoring
The LM393APWRE4 can support low-duty monitoring in battery-powered equipment by comparing a divided supply or battery voltage against a reference and producing an open-collector status indication. The listed 0.4 mA typical supply-current drain per comparator helps limit continuous consumption, while the dual-channel arrangement allows two thresholds without duplicating the integrated circuit. The open-collector output can remain unconnected when no fault indication is required or drive a high-impedance pull-up network. Because divider current and input bias current can dominate the total load, choose divider resistance carefully and confirm that the comparator's leakage, offset, and common-mode characteristics meet the required accuracy over the battery's operating range.
מומלץ
Level and Reference Cross-Check
The LM393APWRE4 can implement two independent reference-crossing checks in analog control, measurement, or interface boards. One channel may compare an incoming logic-level-shifted signal against a threshold, while the other checks a reference rail or validates an analog measurement. The open-collector outputs can drive pulled-up status LEDs, digital inputs, or downstream control stages without requiring a separate line driver. The device's differential inputs help reject the common portion of a sensed signal, although comparator performance still depends on input offset and common-mode limits. Use local decoupling and a low-impedance reference source to prevent switching activity or supply variation from shifting the decision point.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור LM393APWRE4 — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | LM393BIPWR | LM393APWR | LM393APWRQ1 | LM2903PWR | LM2903PWRQ1 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-TSSOP (PW) | 8-TSSOP (PW) | 8-TSSOP (PW) | 8-TSSOP (PW) | 8-TSSOP (PW) | 8-TSSOP (PW) |
| Number of Channels | 2 | 2 | 2 | 2 | 2 | 2 |
| Output Type | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector |
| Maximum Supply Voltage | 30 V | 32 V | 30 V | 30 V | 36 V | 36 V |
מבדילים עיקריים
- Original LM393 supply envelope (לעומתLM2903PWR)
- B-revision supply-voltage headroom (לעומתLM393APWRE4)
- Automotive-grade ordering option (לעומתLM393APWR)
הערות תכנון
Calculate the pull-up resistor from the maximum required sink current and the acceptable output rise time. The pull-up current is Vpullup divided by Rpullup, while the output rise time also depends on the total bus capacitance and the open-collector transistor's on resistance. Do not select the resistor from nominal logic current alone; confirm that the worst-case pull-up voltage, output low level, downstream input thresholds, and permissible sink current all satisfy the comparator and receiving-device specifications.
Place the device close to the protected signal source and its pull-up network to minimize input-trace pickup and output-capacitance effects. Keep the differential input and reference paths away from switching nodes and high-current return paths. Route the two channels independently even when they monitor related thresholds, and provide a local ground return that avoids sharing high-current paths. The 8-TSSOP footprint has closely spaced leads, so verify pad dimensions and assembly clearances against the manufacturer package drawing before PCB release.
Do not treat the open-collector output as a push-pull logic output. It cannot actively produce a high voltage, so omitting the pull-up resistor leaves the output undefined or floating during the released state. Also avoid using a pull-up supply outside the device's operating envelope or outside the receiving logic's allowed voltage. For an unused comparator channel, connect the inputs to a defined common-mode voltage rather than allowing floating inputs to create unpredictable transitions.
The 0.3 us propagation delay is a device-level figure and may not equal the complete system response. Input overdrive, common-mode voltage, output pull-up resistance, capacitance, and the receiving logic threshold can add delay or produce slow edges. For repetitive signals, test the complete circuit at worst-case voltage and temperature. Add filtering at the inputs when the compared signal contains high-frequency noise, but account for the resulting delay when setting the decision timing.
מידע על תאימות
The exact LM393APWRE4 compliance declarations require confirmation from the current manufacturer product documentation or the responsible supply chain.
