LM2901MX/NOPB

LM2901MX/NOPB is TI’s LM2901 quad voltage comparator in a 14‑pin MX package. It contains four independent comparators with open‑collector outputs (they can only sink current; require pull‑up resistors). The device operates on a single supply from roughly 2 V to 36 V and has input common‑mode that includes ground, making it suitable for low‑voltage sensing.
Key points:
- Quad comparator: four input pairs, one output per comparator.
- Open‑collector outputs: need pull‑ups to a chosen supply.
- Single‑supply operation: wide voltage range.
- Pb‑free option: NOPB indicates RoHS lead‑free packaging.
Typical uses: threshold/detection circuits, zero‑crossing detectors, window comparators, and simple level‑shifting tasks where wired‑OR of outputs is useful.
Tip: check the datasheet for exact specs (input offset voltage, propagation delay, input bias, recommended pull‑up values) and the exact MX package variant you’re using.

- LM339 (quad voltage comparator) – the most common drop-in substitute
- LM139 / LM239 – older quad comparator family, pin-compatible with LM339/LM2901
- Any LM339-family device in the same package (e.g., LM339MX/LM339N) is also a functional equivalent to LM2901MX/NOPB
Note: Functionally, LM2901/LM339/LM139/LM239 are all quad open-collector comparators with similar specs; check pinout for exact packaging.

LM2901MX/NOPB is a TI quad low-power differential comparator with open-collector outputs. Key features:
- Four independent voltage comparators
- Open-collector outputs (pull-up resistor required; can be wired-OR/wired-AND)
- Wide supply voltage: 2 V to 36 V
- Input common-mode range includes ground
- Output capability: sinks current up to about 16 mA per comparator
- Low power consumption (suitable for battery/low-power apps)
- Industrial temperature version: typically -40°C to +85°C
- Packaging: MX family package (varies by device)
- NOPB: lead-free, RoHS-compliant
Note: Check the specific datasheet for exact package type and electrical limits for your exact variant.

- Pin count: 14 pins (in the standard package variants like DIP/SOIC/MSOP for LM2901MX/NOPB).
- Function: Quad low-power comparator with four independent 2-input comparators and open-collector outputs (each output requires a pull-up resistor). Input common-mode includes ground; suitable for voltage comparison applications.

Manufacturer: Texas Instruments (TI).
Company type: American multinational semiconductor company that designs and manufactures integrated circuits, especially analog and embedded processing ICs (LM2901MX/NOPB originated from National Semiconductor, now part of TI).

LM2901MX/NOPB is a quad open-collector voltage comparator. Common application areas:
- Battery and power-management protection (low-battery/undervoltage)
- AC zero-cross detectors and mains sensing
- Window detectors with hysteresis
- Level shifting and microcontroller interfacing
- Sensor conditioning (thermistors, LDRs, temperature/pressure sensors)
- Alarm/limit-switch and industrial control circuits
- Relaxation oscillators and PWM/control circuits
- Simple comparator-based ADC front-ends (wired-OR with open-collector outputs)
Note: Open-collector outputs enable wired-OR and easy level shifting.

LM2901MX/NOPB uses the MSOP-14 (14-pin) small-outline package and is Pb-free (NOPB).