STMicroelectronics LM2901Q4T

Overview

LM2901Q4T from STMicroelectronics is a quad low-power voltage comparator in QFN16 3×3 mm wettable flank package, designed for single-supply operation from +2 V to +36 V (or ±1 V to ±18 V), featuring 1.1 mA total supply current, 25 nA typical input bias current, and rail-to-rail input common-mode range including the negative rail. It drives TTL, CMOS, and ECL loads in industrial sensor interfaces and power monitoring circuits.

For engineers reviewing the LM2901Q4T datasheet, LM2901Q4T pinout, LM2901Q4T application, or LM2901Q4T equivalent, this page delivers verified electrical parameters, validated QFN16 pin mapping, automotive-grade thermal performance data, and direct comparator substitution guidance - all grounded in ST's production datasheet Rev 10 (Nov 2023).

Technical Context

The LM2901Q4T integrates four independent comparators with PNP-input stages enabling input common-mode voltage down to the negative rail - critical for ground-referenced sensing. Its open-collector outputs support wired-OR logic and level-shifting across mixed-voltage systems.

It operates across −40 °C to +125 °C with guaranteed 250 mV low-level output saturation at 4 mA sink current, and achieves 1.3 µs small-signal response time with 5.1 kΩ load to V_CC+, making it suitable for fast threshold detection in motor control feedback and battery protection.

Key Specifications

Pinout & Package

LM2901Q4T uses a 16-pin QFN (3 mm × 3 mm) wettable flank package with exposed thermal pad (ECOPACK® compliant), optimized for automated optical inspection (AOI) and enhanced solder joint reliability in automotive and industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad voltage comparator applications.

Compared with LM2901Q4T, LM339DT offers better offset but lacks modern packaging and automotive qualification, while TLV3704IPWR trades industrial voltage range and ruggedness for ultra-low power and precision - making LM2901Q4T optimal for harsh-environment 12–36 V systems needing AOI-compatible assembly.

Availability

LM2901Q4T is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and battery management systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for LM2901Q4T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering silicon solutions for smart mobility, power, and sensing applications across automotive, industrial, and consumer markets.

The LM2901 series belongs to ST's precision analog comparator portfolio, engineered for robust performance in noisy industrial environments and automotive under-hood conditions - emphasizing wide supply range, rail-to-rail input, and AEC-Q100 compliance.

FAQ

Is LM2901Q4T pin-compatible with standard SO-14 or TSSOP-14 versions of LM2901?

No - LM2901Q4T uses a 16-pin QFN layout distinct from the 14-pin SO/TSSOP footprints. Pin functions are electrically identical, but physical layout, thermal pad, and pin count differ. Migration requires PCB redesign and layout validation per ST's QFN16 mechanical drawings (Fig 24–25, DocID2468 Rev 10).

Does LM2901Q4T support dual-supply operation with ±15 V?

Yes - the device is fully specified for dual supplies from ±1 V to ±18 V. At ±15 V, supply current remains 1.1 mA typ., input common-mode range extends from −16.5 V to +13.5 V, and output saturation voltage stays ≤700 mV at 4 mA sink, per Table 3 in the datasheet.

What is the maximum sink current per output, and is short-circuit protection included?

Each output supports ≥6 mA sink current (min. 6 mA, typ. 16 mA at V_O = 1.5 V). No internal short-circuit protection is provided - ST explicitly warns that sustained output short-circuits to V_CC or GND cause destructive heating. External current limiting or fault-handling logic is required for robust designs.

Can LM2901Q4T drive a 10 kΩ pull-up resistor to 5 V while maintaining TTL logic levels?

Yes - with a 10 kΩ pull-up to 5 V, the output saturates to ≤250 mV (typ.) at 0.5 mA sink, well within TTL's 0.8 V V_IL limit. The 1.1 mA total supply current remains unaffected by pull-up value, ensuring consistent low-power operation regardless of external load.