LM393DE4 - Dual Open-Collector Comparator | Texas Instruments
MPN: LM393DE4 ✓ NakahandaLM393DE4 Ulas
A comparator is an analog semiconductor that evaluates two input voltages and produces a digital logic state indicating which input is higher. The LM393 belongs to the comparator hierarchy, where differential comparator forms part of interface ICs and broader signal-conditioning semiconductors. Unlike an op amp, the LM393 does not provide a push-pull output; each output uses an open collector, allowing the output node to be pulled up externally to a chosen logic voltage. This architecture is useful for wired-interface, threshold-detection, and open-collector signaling circuits.
The two channels are designed to compare differential inputs against common-mode and output limits defined by the manufacturer datasheet. Key characteristics include a 300 ns response-time figure, a 2 V to 36 V supply range, and operation from either single or dual supplies. The open-collector outputs can sink external current through a pull-up resistor, but their rise time depends on the pull-up resistance, total node capacitance, and the next-stage input characteristics.
The LM393DE4 is offered in the standard 8-SOIC package identified by the DigiKey listing as 8-SOIC, measuring 0.154 inches, or 3.90 mm, in body width. Commercial-grade temperature coverage is associated with the LM393 family. Because this is a general-purpose comparator rather than a precision rail-to-rail comparator, the input offset, input bias current, common-mode range, output timing, and output-current limits should be checked against the application before production release.
Typical applications include detecting whether a sensor signal has crossed a threshold, monitoring battery or power-supply rails, translating industrial sensor states to logic levels, and supporting open-collector alarm or fault signaling. Two independent channels can monitor two related voltages, or both halves of the IC can serve unrelated functions when that improves layout efficiency and inventory consolidation.
Design the output pull-up network carefully because the open collector does not actively source current. Place the pull-up resistor near the driven node, confirm that its voltage is within the next device's input limits, and evaluate its value against output rise time and power dissipation. Check the input common-mode range at the actual supply voltage, and allow sufficient spacing from the comparator switching threshold to prevent noise from causing repeated output transitions.
This page combines the LM393DE4 electrical characteristics, pin assignment, drop-in alternatives, application guidance, and design checks to support component selection and PCB implementation. The comparison section highlights practical differences among electrically similar dual open-collector comparators, while the design notes focus on pull-up selection, supply-noise behavior, and robust threshold implementation.
Mga alternatibo na pwedeng ilagay na LM393DE4 — 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 LM393DE4 (parehas na form factor at footprint) — pagkakaiba sa Package, Number of Channels, Response Time, Operating Temperature Range.
LM393D
✅ Drop-In✗ Wala sa Stock
$0.11 / Yunit
Tingnan ang Datasheet →LM393B
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
LM393LV
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
LM2903D
✅ Drop-In ⚠️ Mga Talaan Hindi NaiwerikmoMagkontak para sa presyo
Tingnan ang Datasheet →LM393D
✅ Drop-In✗ Wala sa Stock
$0.11 / Yunit
Tingnan ang Datasheet →LM393D
✅ Drop-In✗ Wala sa Stock
$0.11 / Yunit
Tingnan ang Datasheet →LM393D
✅ Drop-In✗ Wala sa Stock
$0.11 / Yunit
Tingnan ang Datasheet →LM393DE4 Mga Pinakamataas na Rating at Electrical Characteristics
| Comparator Type | Dual differential comparator |
| Number of Channels | 2 channels |
| Type ng Output | Open-collector |
| Supply Voltage Range | 2 V to 36 V |
| Single or Dual Supply | Single supply or dual supplies |
| Response Time | 300 ns |
| Supply-Current Drain | 0.4 mA typical per comparator |
| Tested Maximum Supply Voltage | 30 V for V-device; 32 V for non-V devices |
| Commercial Temperature Range | 0 °C to 70 °C |
| Packhaging | 8-SOIC |
| Package Body Width | 0.154 in (3.90 mm) |
| Uri ng Pagpapasok | Surface mount |
Pin Configuration ng LM393DE4
| Pin 1 | OUT1 — Open-collector output for comparator channel 1 |
| Pin 2 | IN1- — Inverting input for comparator channel 1 |
| Pin 3 | IN1+ — Non-inverting input for comparator channel 1 |
| Pin 4 | GND — Ground connection |
| Pin 5 | IN2+ — Non-inverting input for comparator channel 2 |
| Pin 6 | IN2- — Inverting input for comparator channel 2 |
| Pin 7 | OUT2 — Open-collector output for comparator channel 2 |
| Pin 8 | VCC — Positive supply connection |
Tipikal na mga Gamit
LM393DE4 ay nararapat para sa 6 aplikasyons: Battery Voltage Monitoring, Industrial Sensor Threshold Detection, Power-Supply Fault Signaling, Window and Limit Comparator, Open-Collector Interface Bridging, Audio and Control Signal Conditioning.
Battery Voltage Monitoring
The LM393DE4 fits battery monitoring because its 2 V to 36 V supply range accommodates many industrial and automotive battery systems, while two differential channels can monitor positive and auxiliary rails. Divide each battery voltage down to the comparator's permitted input range and compare it with a reference threshold. The 300 ns response time allows rapid state changes, while the open-collector output can directly drive a fault input, relay driver, or status LED with a pull-up. Add hysteresis so battery noise does not produce repeated threshold transitions.
Inirekomenda
Industrial Sensor Threshold Detection
The LM393DE4 is appropriate for industrial sensor interfaces that require a direct differential comparison rather than amplifier-style analog amplification. Its two open-collector channels can each evaluate a conditioned sensor signal against a reference, with a 0.4 mA typical supply-current drain per comparator. The 8-SOIC package provides a compact, surface-mount implementation, and the 300 ns response time supports fast threshold events. Use an external pull-up and protection network because industrial sensor wiring can introduce transients and ground-offset errors.
Inirekomenda
Power-Supply Fault Signaling
The LM393DE4 can monitor power rails and generate an open-collector fault indication when a divided voltage crosses a limit. Its 2 V to 36 V operating range supports supervision of higher-voltage systems, and the open-collector output can sink current for a wired-alarm or digital fault input. Two independent channels allow monitoring of more than one rail without requiring two packages. Select the external pull-up voltage carefully, protect the inputs against supply transients, and include filtering or hysteresis where the monitored rail contains switching ripple.
Inirekomenda
Window and Limit Comparator
The two differential channels of the LM393DE4 can implement a voltage window by comparing one sensed signal against upper and lower thresholds. This arrangement is useful for battery, capacitor, signal-range, or input-conditioning checks where a signal outside an allowed band must produce an alarm. Both open-collector outputs may be combined by wired logic when an active-low window-fault signal is useful. Keep both reference networks independent and verify common-mode limits at the lowest operating supply; a fast 300 ns response does not remove the need for clean references.
Inirekomenda
Open-Collector Interface Bridging
The LM393DE4 can bridge a low-voltage sensing circuit to a higher-voltage or separately defined logic domain through its open-collector outputs. Each output sinks current from a pull-up resistor connected to the destination logic rail, allowing the interface voltage to be selected independently of the comparator supply. The architecture is well suited to relay-driver inputs, legacy open-collector buses, and fault lines. Verify the maximum sink current and output-saturation behavior, and ensure the pull-up voltage and resistor dissipation remain within the receiving device's limits.
Inirekomenda
Audio and Control Signal Conditioning
The LM393DE4 can condition slow control or audio-related envelope signals by comparing them against adjustable thresholds. Its differential inputs help compare a biased or divided signal directly with a reference, while the open-collector output provides a digital transition suitable for a control MCU. The 300 ns response time is more than adequate for many envelope and supervisory functions, though it does not make the device a high-speed audio comparator. Keep input levels within the common-mode range and add hysteresis to prevent chatter around an analog threshold.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for LM393DE4 — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | LM393D | LM393B | LM393LV | LM2903D | LM393D |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | STMicroelectronics |
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Comparator Type | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator |
| Output Type | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector |
Pangunahing mga Pagkakaiba
- Commercial dual comparator with two open-collector outputs (kumpara saLM2903D)
- Wide 2 V to 36 V operating supply range (kumpara saLM393LV)
- Compact 8-SOIC implementation with independent channels (kumpara saSTMicroelectronics LM393D)
Talaan ng Disenyo
Do not treat the open-collector output as a push-pull logic output. Connect a pull-up resistor from OUT1 or OUT2 to the required logic rail, and confirm that the resistor's current remains within the output sink rating at the maximum low-level output voltage. Keep the pull-up short and route the output away from sensitive analog nodes. If two open-collector outputs are wired together, their device limits, supply domains, and pull-up arrangement must be compatible.
Check the input common-mode range at the lowest supply voltage rather than relying only on the 2 V to 36 V operating range. Add hysteresis with positive feedback when the sensed signal can cross the reference slowly or contains noise; otherwise repeated switching can load the following stage and create additional system noise. Reference resistors should be positioned near the comparator inputs, while the sensed-signal path should remain away from output and supply-return currents.
Place the LM393DE4 close to the protected input node, reference divider, and output pull-up network to minimize parasitic sensitivity. Provide a solid ground connection and decouple the supply near pin 8. Maintain separation between input and output routing, particularly when an open-collector output drives a cable or relay. Use the 8-SOIC land pattern and follow the manufacturer pin-description table when defining tracks and solder-mask clearances.
The LM393DE4 can operate from single or dual supplies, but the external output pull-up does not have to share the comparator supply voltage. Select the pull-up rail to match the receiving logic device and check its absolute maximum voltage. When using dual supplies, connect the ground reference to the appropriate supply midpoint and avoid allowing either input to exceed the documented common-mode range. Input protection may be required if the monitored line experiences transients above the device ratings.
Impormasyon ng Pagsunod sa Kautusan
The LM393DE4 is a commercial-grade analog comparator, but no exact LM393DE4 RoHS, REACH, lead-free, halogen-free, or conflict-minerals status was identified. AEC-Q100 qualification is not applicable to this ordering code.
