LM393QT

LM393QT is a dual, low‑power voltage comparator from the LM393 family. It contains two independent comparators with open‑collector outputs, designed to compare two analog voltages and switch logic based on which input is higher.
Key points:
- Supply: typically 2–36 V.
- Outputs: open-collector (can sink current; require external pull‑up to a logic level).
- Inputs: common‑mode range includes ground; up to about Vcc−1.5 V.
- Hysteresis: no internal hysteresis (often added externally for clean switching).
- Speed/power: microsecond‑range propagation delay; low quiescent current.
How it’s used:
- Add pull‑up resistors on each output.
- Compare thresholds in battery level sensing, zero‑crossing detectors, window/detection circuits, or simple level shifters.
- Mind input voltages not to exceed rails; consider external hysteresis for stable switching.
Packaging: available in 8‑pin packages (DIP/SOIC/TSSOP variants) depending on exact part.
In short, LM393QT is a versatile, dual, open‑collector comparator ideal for inexpensive, single‑supply threshold sensing.

Here are the typical features of the LM393QT (dual comparator):
- Dual, independent voltage comparators
- Open-collector outputs (need external pull-up resistors)
- Input common-mode range includes ground (down to the negative rail)
- Wide supply voltage: 2 V to 36 V
- Output can sink current up to about 16 mA per comparator
- Low power consumption and fast response (short propagation delay)
- Low input bias and offset voltages
- Allows single-supply operation
- Available in multiple packages (e.g., DIP, SOIC, etc.) and automotive/commercial grade variants
Note: Specifics (pinout, exact temp range, and package options) depend on the exact device variant and package.

LM393QT is an 8-pin package, typically an SOIC-8 (surface-mount). It is also available in a DIP-8 (through-hole) version.

- Pin count: 8 pins (DIP-8/SOIC-8 package, LM393QT variant).
- Function: Dual voltage comparators with open-collector outputs (two independent comparators). Each compares V+ vs V−; outputs are open-collector and require a pull-up resistor to a logic level. Pin1/2/3 correspond to comparator A, pins5/6/7 to comparator B, with Vcc on pin8 and GND on pin4.

Texas Instruments (TI) manufactures the LM393QT. TI is an American multinational technology company that designs and manufactures semiconductors and a wide range of analog and mixed-signal integrated circuits for diverse industries.

LM393QT is a dual, low-power comparator with open-collector outputs. Applications include:
- Threshold/level detection and zero-cross sensing
- Undervoltage/overvoltage monitoring in power supplies and batteries
- watchdog circuits and fault alarms
- PWM/control loops in DC-DC converters and motor drives (with pull-ups)
- Level shifting and signal conditioning
- Thermostats/temperature monitoring and light/photodiode sensing with hysteresis

LM393QT is a dual open-collector comparator. Common equivalents drop-in include:
- LM393 (TI/NSC family)
- LM393N, LM393P (package variants)
- LM2903, LM2903N (pin-compatible dual comparators)
Note: check datasheets for pinout, supply range (2–36V for LM393, different for LM290x), and input common-mode differences.