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

Texas Instruments LM2901DG4

Name: LM2901DG4
Brand: Texas Instruments
SKU: LM2901DG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM2901DG4

Manufacturer:: Texas Instruments

Category:: Comparators

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

Datasheet:: LM2901DG4.pdf

Description:: IC COMPARATOR 4 GEN PUR 14SOIC

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Product details

Overview

LM2901DG4 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-used in motor drive fault detection, server PSU overvoltage monitoring, and industrial sensor thresholding.

For engineers reviewing the LM2901DG4 datasheet, LM2901DG4 pinout, LM2901DG4 application, or LM2901DG4 equivalent, key selection criteria include its −40°C to +125°C operating temperature, open-collector outputs compatible with TTL/MOS/CMOS, 1.2 mA max quiescent current at 5 V, and SOIC-14 package compatibility with legacy LM2901 designs.

Technical Context

The LM2901DG4 implements four independent voltage comparators with internal ESD clamps enabling 2 kV HBM robustness. Its input stage supports common-mode voltages from ground to (V_CC − 2 V), and differential inputs tolerate up to ±38 V without damage.

Each comparator delivers open-collector output capable of sinking 21 mA, with low-level output voltage ≤400 mV at 4 mA load and high-level leakage <50 nA at 5 V-enabling direct interface to microcontroller GPIOs or discrete pull-up networks.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2 V to 36 V - enables direct use in 3.3 V, 5 V, 12 V, and 24 V industrial rails without level-shifting.
Input Offset Voltage (max)	±5.5 mV over −40°C to +125°C - ensures reliable threshold detection across automotive and industrial temperature extremes.
Propagation Delay	1 µs typical (100 mV step, 5 mV overdrive) - supports real-time response in motor control feedback and power sequencing.
Quiescent Current	1.2 mA max (all four comparators, 5 V supply) - enables low-power always-on monitoring in battery-backed systems.
ESD Rating (HBM)	±2000 V - meets IEC 61000-4-2 Level 2 system-level ESD immunity requirements without external protection.
Output Sink Current	21 mA per channel - drives LEDs, relays, or logic gates directly without external buffer transistors.
Common-Mode Input Range	Ground to (V_CC − 2 V) - allows direct sensing of signals referenced to system ground, e.g., current-sense amplifier outputs.

Pinout & Package

LM2901DG4 is housed in a 14-pin SOIC (D) package measuring 8.70 mm × 3.90 mm, with exposed pad not present. Pin functions follow standard quad comparator layout optimized for PCB routing efficiency and thermal dissipation in high-density layouts.

Pin/Terminal	Circuit Role	Design Meaning
1	OUT1	Open-collector output of Comparator 1 - requires external pull-up; sinks up to 21 mA for direct logic interfacing.
2	IN1−	Inverting input of Comparator 1 - accepts signals down to ground; common-mode range extends to V_CC − 2 V.
3	IN1+	Non-inverting input of Comparator 1 - supports rail-to-rail input operation; differential voltage tolerance ±38 V.
4	V_CC	Positive supply pin - powers all four comparators; decoupling capacitor recommended within 10 mm.
5	OUT2	Open-collector output of Comparator 2 - electrically identical to OUT1; shares no internal coupling.
6	IN2−	Inverting input of Comparator 2 - independent channel; no crosstalk with other inputs under normal operation.
7	IN2+	Non-inverting input of Comparator 2 - supports same input voltage range and ESD protection as IN1±.
8	GND	Ground reference - must be low-impedance connection; serves as return path for all comparator outputs and inputs.
9	IN3+	Non-inverting input of Comparator 3 - enables simultaneous multi-threshold monitoring (e.g., undervoltage, overvoltage, window).
10	IN3−	Inverting input of Comparator 3 - paired with IN3+ for third independent comparison function.
11	OUT3	Open-collector output of Comparator 3 - identical electrical behavior to OUT1/OUT2; supports wired-OR configurations.
12	IN4+	Non-inverting input of Comparator 4 - completes full quad functionality; suitable for status flag generation.
13	OUT4	Open-collector output of Comparator 4 - final output channel; enables four independent decision points in one IC.
14	IN4−	Inverting input of Comparator 4 - completes fourth independent input pair; no shared bias network with other channels.

Key Features

Feature	Design Value
Drop-in B-version upgrade	Replaces LM2901, LM339, and LM239 without PCB changes-same SOIC-14 footprint and pinout.
Rail-to-rail input capability	Accepts input signals from ground to V_CC − 2 V, eliminating need for level-shifters in single-supply sensor interfaces.
Low propagation delay	1 µs response time enables real-time fault detection in motor drives and UPS systems before damage occurs.
High ESD ruggedness	2 kV HBM rating reduces field failures during handling and system integration without added protection components.
Wide supply range	Operates from 2 V to 36 V-supports both low-voltage IoT nodes and high-voltage industrial power supplies.

Applications

Motor Drive Protection	Server Power Supply Monitoring
Use Scenario: Detect overcurrent, overtemperature, or bus overvoltage in three-phase inverter stages. IC Role / Device Role / Timing Role: Quad comparator compares sensed analog signals against fixed thresholds to assert fault flags within 1 µs. Use Value: Prevents IGBT destruction by triggering shutdown before thermal runaway or shoot-through occurs.	Use Scenario: Monitor +12 V, +5 V, +3.3 V, and standby rails in redundant server PSUs. IC Role / Device Role / Timing Role: Each comparator independently validates one rail's presence and regulation margin. Use Value: Enables immediate failover to backup PSU upon first rail deviation, meeting <100 ms uptime SLA.
Industrial Sensor Interface	Appliance Safety Control
Use Scenario: Convert analog outputs from pressure, temperature, or flow sensors into digital status bits. IC Role / Device Role / Timing Role: Compares conditioned sensor voltage against programmable thresholds using resistor dividers. Use Value: Eliminates ADC and firmware overhead for simple go/no-go decisions in PLC I/O modules.	Use Scenario: Enforce door interlock, temperature cutoff, and water-level limits in washing machines and dishwashers. IC Role / Device Role / Timing Role: Four comparators monitor critical safety parameters simultaneously with hardware-level priority. Use Value: Meets IEC 60335 Class A requirements via deterministic, zero-latency hardware trip paths.

Motor Drive Protection

Server Power Supply Monitoring

Use Scenario: Detect overcurrent, overtemperature, or bus overvoltage in three-phase inverter stages.

IC Role / Device Role / Timing Role: Quad comparator compares sensed analog signals against fixed thresholds to assert fault flags within 1 µs.

Use Value: Prevents IGBT destruction by triggering shutdown before thermal runaway or shoot-through occurs.

Use Scenario: Monitor +12 V, +5 V, +3.3 V, and standby rails in redundant server PSUs.

IC Role / Device Role / Timing Role: Each comparator independently validates one rail's presence and regulation margin.

Use Value: Enables immediate failover to backup PSU upon first rail deviation, meeting <100 ms uptime SLA.

Industrial Sensor Interface

Appliance Safety Control

Use Scenario: Convert analog outputs from pressure, temperature, or flow sensors into digital status bits.

IC Role / Device Role / Timing Role: Compares conditioned sensor voltage against programmable thresholds using resistor dividers.

Use Value: Eliminates ADC and firmware overhead for simple go/no-go decisions in PLC I/O modules.

Use Scenario: Enforce door interlock, temperature cutoff, and water-level limits in washing machines and dishwashers.

IC Role / Device Role / Timing Role: Four comparators monitor critical safety parameters simultaneously with hardware-level priority.

Use Value: Meets IEC 60335 Class A requirements via deterministic, zero-latency hardware trip paths.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM2901BDR	Same B-version specs, but in tape-and-reel SOIC-14 (DR suffix); identical electrical performance and pinout.	No functional difference; DR variant optimized for automated SMT assembly vs. DG4's tube packaging.	Select LM2901BDR for high-volume production; LM2901DG4 suits prototyping and low-quantity builds.
LM339BDR	Same B-version architecture but rated for −40°C to +85°C (vs. LM2901B's −40°C to +125°C); otherwise identical specs.	Limited to commercial/industrial ambient environments; unsuitable for under-hood or high-temp enclosure use.	Choose LM339BDR only if ambient temperature stays ≤85°C and cost sensitivity outweighs extended temp margin.

Compared with LM2901DG4, LM2901BDR offers identical performance in a production-optimized package, while LM339BDR trades 40°C of operating range for potentially lower unit cost in non-extended-temp applications.

Availability

LM2901DG4 is available at Aetrix Electronics and suitable for motor drive protection, server PSU monitoring, and industrial sensor interface applications requiring stable component supply across long product lifecycles.

Supply support for LM2901DG4 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 delivering analog and embedded processing solutions with focus on reliability, precision, and energy efficiency.

The LM2901DG4 belongs to TI's industry-standard quad comparator family, engineered for robust single-supply operation in industrial automation, power management, and safety-critical monitoring systems.

FAQ

What is the maximum supply voltage rating for LM2901DG4?

The LM2901DG4 supports an absolute maximum supply voltage of 38 V, with recommended operating range from 2 V to 36 V. This allows direct integration into 24 V industrial systems and 36 V battery-powered equipment without external regulators or voltage dividers.

Does LM2901DG4 support rail-to-rail input operation?

Yes, the LM2901DG4 accepts common-mode input voltages from ground to (V_CC − 2 V), enabling direct connection to sensors and signal sources referenced to system ground. Both inputs can swing up to V_CC without damage, though valid comparison requires at least one input within the specified common-mode range.

Is LM2901DG4 pin-compatible with legacy LM2901 variants?

Yes, LM2901DG4 is a drop-in replacement for LM2901, LM339, and LM239 in SOIC-14 packages. It retains identical pinout, electrical interface, and footprint-requiring no PCB redesign when upgrading to the improved B-version's lower offset, faster response, and higher ESD rating.

What is the output configuration of LM2901DG4?

The LM2901DG4 features four independent open-collector outputs. Each output requires an external pull-up resistor to V_CC or another logic rail. This configuration enables wired-OR logic, level translation, and direct driving of LEDs, relays, or microcontroller interrupt inputs.

What temperature range does LM2901DG4 operate across?

The LM2901DG4 is rated for operation from −40°C to +125°C ambient temperature, matching the LM2901B specification. This extended range supports deployment in engine compartments, industrial enclosures, and outdoor power electronics where thermal margins exceed commercial-grade alternatives.

LM2901DG4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

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

Series:: -

Packaging:: Tube

Product Status:: Obsolete

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

LM2901DG4 FAQ

1.How can I place an order for LM2901DG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM2901DG4 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 LM2901DG4 reliable?

The price and inventory of LM2901DG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2901DG4 is usually 5 days.

3.What payment methods are accepted for LM2901DG4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2901DG4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM2901DG4?

LM2901DG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM2901DG4 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 LM2901DG4?

For technical support, including LM2901DG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2901DG4 requirements.

6.How does Aetrix verify that LM2901DG4 is sourced from the original manufacturer or authorized distributors?

All LM2901DG4 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 LM2901DG4 meets industry standards.

7.What is the process for return or replacement of LM2901DG4?

All LM2901DG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM2901DG4, 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 LM2901DG4 part is unused and in its original packaging.

Return procedure for LM2901DG4:

1.Submit a request within 90 days.

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

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