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

Texas Instruments LM2901DR

Name: LM2901DR
Brand: Texas Instruments
SKU: LM2901DR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM2901DR

Manufacturer:: Texas Instruments

Category:: Comparators

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

Datasheet:: LM2901DR.pdf

Description:: IC COMPARATOR 4 GEN PUR 14SOIC

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Product details

Overview

LM2901DR from Texas Instruments is a quad differential comparator IC designed for single-supply operation across 2 V to 36 V, featuring ±0.37 mV typical input offset voltage, 1 µs propagation delay, 2 kV HBM ESD rating, and rail-to-rail common-mode input range down to ground - widely deployed in server PSU overvoltage protection and motor drive fault detection circuits.

For engineers reviewing the LM2901DR datasheet, LM2901DR pinout, LM2901DR application, or LM2901DR equivalent, key selection criteria include its −40°C to +125°C operating temperature range, open-collector output compatibility with TTL/MOS/CMOS, 1.2 mA max quiescent current at 5 V, and drop-in replacement capability for legacy LM2901 variants without layout changes.

Technical Context

The LM2901DR implements four independent high-gain comparators with internal ESD clamps enabling robust input ruggedness. Its input stage supports common-mode voltages from ground up to (V_CC − 2 V), and differential inputs tolerate ±38 V, allowing direct sensing of signals referenced to high-side rails or floating sources.

Each comparator features an open-collector NPN output stage capable of sinking 21 mA, compatible with external pull-up to any voltage ≤ V_CC. Quiescent supply current remains stable across 5 V–36 V and −40°C to +125°C, making it suitable for wide-input industrial power monitoring.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2 V to 36 V - enables direct interface with 3.3 V, 5 V, 12 V, and 24 V system rails without level-shifting.
Input Offset Voltage (max)	±5.5 mV over −40°C to +125°C - ensures accurate threshold detection in precision voltage monitoring applications.
Propagation Delay	1 µs (typ) at 5 mV overdrive - supports fast response in overcurrent or fault-detection loops with sub-microsecond timing budgets.
Input Bias Current (max)	25 nA over temperature - minimizes loading error on high-impedance sensor or divider networks.
Output Sink Current	21 mA (min) - drives standard LEDs, optocouplers, or logic-level MOSFET gates directly without buffering.
ESD Rating (HBM)	2000 V - meets industrial handling requirements and reduces susceptibility to assembly-line ESD damage.
Operating Temperature	−40°C to +125°C - qualified for under-hood automotive, industrial motor control, and telecom power systems.

Pinout & Package

LM2901DR is packaged in a 14-pin SOIC (D package), body size 8.70 mm × 3.90 mm, with standard JEDEC MS-012AC footprint and gull-wing leads.

Pin/Terminal	Circuit Role	Design Meaning
1	OUT1	Open-collector output of Comparator 1 - requires external pull-up; sinks current when IN1− > IN1+.
2	IN1−	Inverting input of Comparator 1 - accepts signals down to ground; tolerates up to V_CC + 0.3 V.
3	IN1+	Non-inverting input of Comparator 1 - same voltage range as IN1−; used for reference or signal comparison.
4	V_CC	Positive supply pin - powers all four comparators; decoupling capacitor recommended near pin.
5	OUT2	Open-collector output of Comparator 2 - electrically identical to OUT1; shares no internal connection.
6	IN2−	Inverting input of Comparator 2 - independent channel; supports separate analog sensing paths.
7	IN2+	Non-inverting input of Comparator 2 - paired with IN2− for second independent comparison function.
8	GND	Ground reference - return path for supply and output sink current; must be low-impedance.
9	IN3−	Inverting input of Comparator 3 - third independent channel; supports multi-threshold monitoring.
10	IN3+	Non-inverting input of Comparator 3 - used with IN3− for third comparison decision point.
11	IN4−	Inverting input of Comparator 4 - fourth channel; enables full quad-functionality in compact layout.
12	IN4+	Non-inverting input of Comparator 4 - completes quad set; allows simultaneous evaluation of four conditions.
13	OUT4	Open-collector output of Comparator 4 - independently controllable; supports discrete fault signaling.
14	OUT3	Open-collector output of Comparator 3 - matches OUT1/OUT2/OUT4 electrical behavior and drive strength.

Key Features

Feature	Design Value
Drop-in B-version upgrade	Direct replacement for LM2901, LM2901A, and LM2901V - no PCB or firmware changes required.
Rail-to-rail input range	Common-mode voltage includes ground and extends to (V_CC − 2 V), enabling direct battery or rail monitoring.
Low quiescent current	1.2 mA max total supply current at 5 V - reduces standby power in always-on industrial controllers.
High ESD robustness	2 kV HBM rating with dedicated input clamps - eliminates need for external TVS diodes in many designs.
Wide supply tolerance	Operates from 2 V to 36 V - supports both low-voltage IoT sensors and high-voltage industrial PSUs.

Applications

Server Power Supply Monitoring	Industrial Motor Drive Fault Detection
Use Scenario: Real-time monitoring of +12 V, +5 V, and +3.3 V rails in redundant server PSUs to trigger shutdown on overvoltage or undervoltage events. IC Role / Device Role / Timing Role: Quad comparator performs simultaneous threshold comparisons; each channel drives a dedicated fault latch or microcontroller interrupt line. Use Value: Enables sub-1 µs fault response time and eliminates false trips via low 5.5 mV max offset voltage across full temperature range.	Use Scenario: Detecting phase loss, overcurrent, or thermal shutdown conditions in 3-phase inverter gate driver boards. IC Role / Device Role / Timing Role: Compares current-sense amplifier outputs against programmable thresholds; open-collector outputs interface directly with isolation optocouplers. Use Value: 21 mA sink capability drives industry-standard PC817 optocouplers without buffer transistors, reducing BOM count.
Automotive Body Control Module	Building Automation Sensor Interface
Use Scenario: Monitoring battery voltage, ignition status, and door lock actuator feedback in 12 V vehicle ECUs. IC Role / Device Role / Timing Role: Four comparators condition analog signals from potentiometers, thermistors, and Hall sensors before ADC sampling or discrete logic control. Use Value: −40°C to +125°C rating and 2 kV HBM ESD ensure reliable operation in under-dash environments with high thermal and ESD stress.	Use Scenario: Converting HVAC temperature, humidity, and occupancy sensor outputs into digital presence or alarm signals for smart building controllers. IC Role / Device Role / Timing Role: Provides hysteresis-capable window comparators using external resistors; outputs interface with 3.3 V microcontrollers via pull-up resistors. Use Value: Rail-to-rail input range accommodates 0–10 V industrial sensor standards without level-shifting circuitry.

Server Power Supply Monitoring

Industrial Motor Drive Fault Detection

Use Scenario: Real-time monitoring of +12 V, +5 V, and +3.3 V rails in redundant server PSUs to trigger shutdown on overvoltage or undervoltage events.

IC Role / Device Role / Timing Role: Quad comparator performs simultaneous threshold comparisons; each channel drives a dedicated fault latch or microcontroller interrupt line.

Use Value: Enables sub-1 µs fault response time and eliminates false trips via low 5.5 mV max offset voltage across full temperature range.

Use Scenario: Detecting phase loss, overcurrent, or thermal shutdown conditions in 3-phase inverter gate driver boards.

IC Role / Device Role / Timing Role: Compares current-sense amplifier outputs against programmable thresholds; open-collector outputs interface directly with isolation optocouplers.

Use Value: 21 mA sink capability drives industry-standard PC817 optocouplers without buffer transistors, reducing BOM count.

Automotive Body Control Module

Building Automation Sensor Interface

Use Scenario: Monitoring battery voltage, ignition status, and door lock actuator feedback in 12 V vehicle ECUs.

IC Role / Device Role / Timing Role: Four comparators condition analog signals from potentiometers, thermistors, and Hall sensors before ADC sampling or discrete logic control.

Use Value: −40°C to +125°C rating and 2 kV HBM ESD ensure reliable operation in under-dash environments with high thermal and ESD stress.

Use Scenario: Converting HVAC temperature, humidity, and occupancy sensor outputs into digital presence or alarm signals for smart building controllers.

IC Role / Device Role / Timing Role: Provides hysteresis-capable window comparators using external resistors; outputs interface with 3.3 V microcontrollers via pull-up resistors.

Use Value: Rail-to-rail input range accommodates 0–10 V industrial sensor standards without level-shifting circuitry.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM2901DT	TSSOP-14 package (5.0 mm × 4.4 mm); identical electrical specs and pinout to LM2901DR.	Preferred for space-constrained PCBs where SOIC footprint is too large; same thermal performance with proper pad layout.	Select LM2901DT when board area is limited and reflow profile supports fine-pitch TSSOP.
LM339BDR	Same B-version specs but rated for −40°C to +85°C ambient; otherwise identical pinout, supply range, and performance.	Suitable for commercial-grade applications like consumer appliances or office equipment where extended temperature is unnecessary.	Choose LM339BDR for cost-sensitive designs not requiring automotive or industrial temperature grade.

Compared with LM2901DT and LM339BDR, the LM2901DR offers the broadest industrial temperature qualification (−40°C to +125°C) in the most widely adopted SOIC-14 package, balancing thermal reliability, layout flexibility, and global supply chain availability.

Availability

LM2901DR is available at Aetrix Electronics and suitable for server PSU monitoring, industrial motor drive fault detection, and automotive body control modules requiring stable component supply across long production lifecycles.

Supply support for LM2901DR 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

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of leadership in precision analog ICs and industrial-grade components.

The LM2901DR belongs to TI's industry-standard quad comparator family, engineered for high-reliability voltage monitoring and decision-making in harsh environments including automotive, industrial, and telecom infrastructure.

FAQ

What is the maximum supply voltage rating for the LM2901DR?

The LM2901DR supports an absolute maximum supply voltage of 38 V, with recommended operating range from 2 V to 36 V. This allows direct use in 24 V industrial systems and 36 V battery-powered equipment without external regulation, while maintaining full functionality and specified performance across the entire range.

Does the LM2901DR require dual supplies or can it operate from a single rail?

The LM2901DR is designed exclusively for single-supply operation. Its input common-mode range includes ground, and outputs are open-collector - enabling direct interface with 0 V–36 V systems. No negative supply is needed, simplifying power architecture in battery- or DC-fed applications.

Is the LM2901DR pin-compatible with older LM2901 variants?

Yes, the LM2901DR is a drop-in replacement for LM2901, LM2901A, and LM2901V in SOIC-14 packages. Pin functions, electrical behavior, and footprint are identical - only the internal B-version enhancements (lower offset, faster response, higher ESD) differ, with no layout or schematic modifications required.

What is the output configuration of the LM2901DR and how should it be interfaced?

The LM2901DR features four independent open-collector NPN outputs. Each output requires an external pull-up resistor to a logic-compatible voltage (≤ V_CC). This configuration enables wired-OR logic, level translation, and direct driving of LEDs, relays, or optocouplers without additional active components.

Can the LM2901DR inputs safely handle voltages above the positive supply rail?

Yes - the LM2901DR differential input voltage rating is ±38 V, and individual inputs tolerate up to V_CC + 0.3 V. This allows direct connection to signals referenced to higher rails (e.g., sensing 48 V bus with 12 V supply), provided input current is limited to ±50 mA per pin per absolute maximum ratings.

LM2901DR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

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

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: General Purpose

Number of Elements:: 4

Output Type:: Open-Collector

Voltage - Supply, Single/Dual (±):: 2V ~ 30V, ±1V ~ 15V

:: 7mV @ 30V

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

Current - Input Bias (Max):: 20mA

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-SOIC

LM2901DR FAQ

1.How can I place an order for LM2901DR through Aetrix?

Please submit a Request for Quotation (RFQ) for LM2901DR 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 LM2901DR reliable?

The price and inventory of LM2901DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2901DR is usually 5 days.

3.What payment methods are accepted for LM2901DR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2901DR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM2901DR?

LM2901DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM2901DR 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 LM2901DR?

For technical support, including LM2901DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2901DR requirements.

6.How does Aetrix verify that LM2901DR is sourced from the original manufacturer or authorized distributors?

All LM2901DR 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 LM2901DR meets industry standards.

7.What is the process for return or replacement of LM2901DR?

All LM2901DR units undergo pre-shipment inspection (PSI). If there is an issue with LM2901DR, 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 LM2901DR part is unused and in its original packaging.

Return procedure for LM2901DR:

1.Submit a request within 90 days.

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

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