LM2901A-SR

LM2901A-SR is TI’s quad low-power voltage comparator in a 14-pin small-outline package. It contains four independent comparators with open-collector outputs, designed for single-supply operation.
Key points:
- Quad comparator: four comparison channels in one IC.
- Open-collector outputs: require pull-up resistors; outputs can be wired-OR.
- Supply range: typically 2–36 V; input common-mode includes ground.
- A-grade variant: the “A” usually offers tighter input offset/gain and better temp performance vs. standard LM2901.
- SR suffix: RoHS-compliant, surface-mount packaging.
Common uses:
- Threshold/detection circuits, zero-cross detectors, window comparators.
- Level shifting or simple comparator-based switching in battery-powered or low-power apps.
Quick hookup:
- Connect Vcc to supply, GND to ground.
- Each output needs a pull-up resistor to Vcc.
- Apply inputs to the corresponding + and − pins; when V+ > V−, the output transistor is off (output pulled high); when V+ < V−, it sinks current (output low).
Note: not rail-to-rail, and outputs can only source current via the pull-up; consider propagation delay for timing-critical tasks.

LM2901A-SR is a low-power quad differential voltage comparator. Key features:
- Four independent comparators in one package.
- Open-collector outputs (no push-pull); requires external pull-ups; enables wired-OR and interfacing with different logic levels.
- Input common-mode range includes the ground rail (allows true single-supply operation), typically up to VCC−1.5 V.
- Wide supply voltage range: 2 V to 36 V.
- Industrial-grade temperature range: −40 °C to 125 °C.
- Low static power consumption, suitable for battery-powered and energy-efficient designs.
- Surface-mount SR package (RoHS compliant) for compact layouts.
Common applications: level detection, zero-cross/window detection, and simple threshold comparisons.

LM2901A-SR is a quad comparator in a 14‑pin Small Outline IC package (SOIC-14).

- Pin count: 14 pins (DIP-14/SO-14 variants, LM2901A-SR in a 14-pin package).
- Function: Quad voltage comparator with open-collector outputs (four independent comparator channels; outputs require pull-up resistors).

- Manufacturer: Texas Instruments (TI).
- What kind of company: American multinational semiconductor company that designs and manufactures analog and mixed-signal ICs, embedded processors, and other semiconductor products; headquartered in Dallas, Texas.

LM2901A-SR is a quad low‑power comparator with open-collector outputs for single‑supply operation (2–36 V). Key applications: voltage level/threshold detection (power supplies, UVLO), zero-cross and AC sensing, window/double-threshold detectors, thermostat and over/under-voltage protection, PWM/relay driving and motor control, automotive and consumer-sensor interfaces. Outputs require pull-ups.

The LM2901A-SR is a quad low‑power comparator with open-collector outputs. Equivalents include:
- LM339/LM339A (TI) – quad open-collector comparator; pin-compatible
- TS339 (STMicroelectronics) – LM339-compatible drop-in
- LM2901 (same family; direct substitute in many circuits)
Note: check voltage ratings and packaging, but these are the common cross‑references.