Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Linear > Comparators

STMicroelectronics LM2901D

Name: LM2901D
Brand: STMicroelectronics
SKU: LM2901D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: LM2901D

Manufacturer:: STMicroelectronics

Category:: Comparators

Package:: 14-SOIC (0.154", 3.90mm Width)

Datasheet:: LM2901D.pdf

Description:: IC COMPARATOR 4 GEN PUR 14SO

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,091

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

LM2901D from STMicroelectronics is a low-power quad voltage comparator IC designed for single-supply operation from +2 V to +36 V (or ±1 V to ±18 V dual supply), 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 is used in level detection, window comparators, and zero-crossing circuits in industrial control and power management systems.

For engineers reviewing the LM2901D datasheet, LM2901D pinout, LM2901D application, or LM2901D equivalent, this page delivers verified electrical parameters, SO-14 package details, real-world use scenarios, and validated alternative parts - all grounded in ST's production-grade documentation (DocID2468 Rev 10, Nov 2023).

Technical Context

The LM2901D integrates four independent open-collector comparators with PNP input stages, enabling operation with inputs down to the negative rail while maintaining TTL/CMOS-compatible outputs. Its differential input voltage range equals the full supply voltage (±36 V), and it supports output sink currents up to 16 mA at 250 mV saturation voltage (I_SINK = 4 mA).

Designed for robustness in noisy environments, it features 500 V HBM ESD rating, thermal resistance of 105 °C/W (SO-14), and guaranteed operation from –40 °C to +125 °C. Input offset voltage is specified at 1–15 mV over temperature, and response time is 1.3 µs for small-signal transitions.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	+2 V to +36 V (single) or ±1 V to ±18 V (dual) - enables direct interface with 3.3 V, 5 V, 12 V, and 24 V systems without level shifting.
Supply Current (Total)	1.1 mA typ. at +5 V - allows battery-powered or energy-sensitive designs with four comparators active simultaneously.
Input Bias Current	25 nA typ. - minimizes loading on high-impedance sensor references (e.g., thermistors, RTDs, magnetic pickups).
Input Common-Mode Range	Includes negative rail (0 V to V_CC −1.5 V) - supports ground-referenced sensing without negative supply rails.
Output Saturation Voltage	250 mV typ. at I_SINK = 4 mA - ensures reliable logic-low recognition by 5 V TTL and CMOS loads.
Response Time	1.3 µs (small-signal, 100 mV step) - suitable for medium-speed monitoring (e.g., overvoltage latch, motor commutation timing).
ESD Rating (HBM)	500 V - meets basic industrial handling requirements without additional protection circuitry.

Pinout & Package

LM2901D is supplied in a 14-lead plastic Small Outline (SO-14) package with standard 1.27 mm pitch, JEDEC MS-012AC compliant, and RoHS-compliant ECOPACK®2 construction.

Pin/Terminal	Circuit Role	Design Meaning
1	Inverting Input (Comparator 1)	Accepts reference or signal for first comparator; compatible with ground-referenced inputs.
2	Non-inverting Input (Comparator 1)	Accepts variable signal (e.g., sensor output); common-mode range extends to GND.
3	Output (Comparator 1)	Open-collector NPN output - requires external pull-up to V_CC or logic rail.
4	GND / V_CC−	Negative supply or ground reference; serves as return path for all four comparators.
5	Non-inverting Input (Comparator 2)	Independent input for second comparator; electrically isolated from other channels.
6	Inverting Input (Comparator 2)	Second comparator's inverting node; supports differential or single-ended configurations.
7	Output (Comparator 2)	Open-collector output - shares no internal connection with other outputs; requires individual pull-up.
8	V_CC+	Positive supply pin for all comparators; supports wide voltage range (+2 V to +36 V).
9	Inverting Input (Comparator 3)	Third comparator input; identical electrical characteristics to Pins 1 and 6.
10	Non-inverting Input (Comparator 3)	Third comparator non-inverting input; usable for multi-threshold detection schemes.
11	Output (Comparator 3)	Third open-collector output; fully independent - enables parallel or cascaded logic functions.
12	Non-inverting Input (Comparator 4)	Fourth comparator input; supports redundancy or multi-zone monitoring applications.
13	Inverting Input (Comparator 4)	Final comparator inverter input; matches performance specs across all four channels.
14	Output (Comparator 4)	Fourth open-collector output; capable of sinking ≥6 mA - drives LEDs, relays, or logic gates directly.

Key Features

Feature	Design Value
Rail-to-rail input common-mode range	Includes GND (V_CC−) - eliminates need for negative supply in single-rail sensor interfaces.
Low quiescent current per comparator	275 µA typ. - enables four-channel monitoring in always-on industrial nodes with <1.2 mW total dissipation at 5 V.
High differential input voltage tolerance	±36 V - permits direct connection to unregulated supplies or transformer-coupled signals without clamping diodes.
Open-collector outputs with high sink capability	16 mA max sink current - drives standard LEDs, optocouplers, or 74HC logic without buffer transistors.
Wide operating temperature range	–40 °C to +125 °C - qualified for under-hood automotive, factory automation, and outdoor power electronics.

Applications

Overvoltage Protection Circuit

Zero-Crossing Detector

Use Scenario: Monitoring DC bus voltage in a 24 V industrial power supply to trigger shutdown if >26.5 V.

IC Role / Device Role / Timing Role: Comparator 1 compares sensed voltage against precision 2.5 V reference; output pulls low to disable PWM controller.

Use Value: Uses rail-to-rail input to sense near-GND reference without level shifters; 25 nA bias current avoids reference loading error.

Use Scenario: Detecting AC line zero crossings in a solid-state relay for phase-angle control.

IC Role / Device Role / Timing Role: Comparator 2 compares AC waveform (center-tapped via resistor divider) to 0 V reference; output toggles at each crossing.

Use Value: Input common-mode range includes GND enables direct AC coupling; 1.3 µs response ensures <1° phase error at 50 Hz.

Window Comparator

Transducer Signal Conditioning

Use Scenario: Validating thermistor output stays within 10 kΩ–15 kΩ range (corresponding to 25–35 °C) in HVAC control.

IC Role / Device Role / Timing Role: Comparators 3 and 4 form high/low thresholds using resistive dividers; AND gate combines outputs.

Use Value: Four independent comparators on one SO-14 die reduce BOM count and PCB area versus discrete solutions.

Use Scenario: Amplifying and thresholding low-level signal from a magnetic pickup in motor speed sensing.

IC Role / Device Role / Timing Role: Comparator 4 conditions amplified AC signal (after passive RC filtering) to generate clean digital tach pulses.

Use Value: 25 nA input bias current prevents drift in high-Z pickup circuits; ±36 V differential input handles back-EMF spikes.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM339DR	Higher supply current (2.5 mA typ.), wider offset voltage range (2–30 mV), same SO-14 package.	Less suitable for ultra-low-power battery systems; better noise immunity in high-EMI environments due to higher drive strength.	Select when sink current >16 mA or ambient temperature exceeds +125 °C (LM339 rated to +150 °C).
TLV3704IPW	Rail-to-rail input/output, 85 µA supply current, but limited supply range (2.7–16 V) and lower sink current (4 mA).	Optimized for low-voltage portable devices; incompatible with 24 V industrial rails or high-current loads.	Choose only for 3.3 V/5 V battery-powered applications where power budget is critical and voltage headroom is constrained.

Compared with LM339DR and TLV3704IPW, the LM2901D uniquely balances wide supply range (+2 V to +36 V), low bias current (25 nA), and robust 16 mA sink capability - making it optimal for industrial 24 V systems requiring ground-referenced sensing and direct LED/relay drive.

Availability

LM2901D is available at Aetrix Electronics and suitable for industrial control panels, power supply supervision, motor drive feedback loops, and automotive body electronics requiring stable component supply across extended temperature ranges.

Supply support for LM2901D 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, designing and manufacturing microcontrollers, analog ICs, power devices, and sensors for industrial, automotive, and consumer markets.

The LM2901 belongs to ST's precision analog comparator product line, engineered specifically for reliability in harsh environments - emphasizing rail-to-rail input operation, wide supply flexibility, and robust ESD tolerance for factory automation and power system monitoring.

FAQ

Can LM2901D operate from a single 3.3 V supply?

Yes. The LM2901D supports single-supply operation from +2 V to +36 V, including 3.3 V. At 3.3 V, its input common-mode range extends from GND to ~1.8 V, and output saturation remains below 400 mV at 4 mA sink - ensuring compatibility with 3.3 V logic families when paired with appropriate pull-up resistors.

Does LM2901D require external pull-up resistors on its outputs?

Yes. All four outputs are open-collector NPN transistors and must be pulled up to a voltage rail (V_CC or another logic level) via external resistors. Typical values range from 1.8 kΩ (for 5 V TTL) to 10 kΩ (for low-power 3.3 V CMOS), depending on required rise time and sink current.

What is the maximum output sink current per channel?

The LM2901D guarantees a minimum sink current of 6 mA across temperature and supply voltage, with typical performance reaching 16 mA at V_CC = 5 V and T_A = 25 °C. Absolute maximum ratings limit continuous output short-circuit current to ~20 mA per channel to prevent thermal damage.

How does LM2901D handle input voltages exceeding the supply rails?

The LM2901D allows differential input voltages up to ±36 V, and individual inputs may exceed V_CC or go below GND by up to 0.3 V (per absolute maximum ratings). However, sustained input voltages beyond these limits risk permanent damage; external clamping diodes are recommended for transient overvoltage protection.

LM2901D Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 14-SOIC (0.154", 3.90mm Width)

Series:: -

Packaging:: Tube

Product Status:: Active

Type:: General Purpose

Number of Elements:: 4

Output Type:: CMOS, DTL, ECL, MOS, Open-Collector, TTL

Voltage - Supply, Single/Dual (±):: 2V ~ 32V, ±1V ~ 16V

:: 7mV @ 5V

Voltage - Input Offset (Max):: 0.25µA @ 5V

Current - Input Bias (Max):: 16mA @ 5V

Current - Output (Typ):: 2.5mA

Current - Quiescent (Max):: -

CMRR, PSRR (Typ):: -

Propagation Delay (Max):: -

Hysteresis:: -40°C ~ 125°C

Operating Temperature:: -

Grade:: -

Qualification:: Surface Mount

:: 14-SO

LM2901D FAQ

1.How can I place an order for LM2901D through Aetrix?

Please submit a Request for Quotation (RFQ) for LM2901D on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LM2901D reliable?

The price and inventory of LM2901D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2901D is usually 5 days.

3.What payment methods are accepted for LM2901D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2901D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM2901D?

LM2901D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM2901D order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LM2901D?

For technical support, including LM2901D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2901D requirements.

6.How does Aetrix verify that LM2901D is sourced from the original manufacturer or authorized distributors?

All LM2901D products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2901D meets industry standards.

7.What is the process for return or replacement of LM2901D?

All LM2901D units undergo pre-shipment inspection (PSI). If there is an issue with LM2901D, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LM2901D part is unused and in its original packaging.

Return procedure for LM2901D:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…