Texas Instruments LM211QDG4

Overview

LM211QDG4 from Texas Instruments is a high-speed differential voltage comparator in SOIC-8 package, featuring 165 ns response time, ±30 V differential input voltage rating, and operation from single 5-V or dual ±15-V supplies. It delivers open-collector output capable of switching up to 50 V at 50 mA, with strobe and offset balance functions for precision timing and signal conditioning in automotive body control modules.

For engineers reviewing the LM211QDG4 datasheet, LM211QDG4 pinout, LM211QDG4 application, or LM211QDG4 equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, automotive-grade thermal and electrical behavior, and two confirmed alternative comparators for temperature-extended or cost-optimized designs.

Technical Context

The LM211QDG4 uses a PNP input stage enabling rail-to-rail common-mode operation down to VCC−, supporting accurate comparison near negative supply rails. Its high-gain internal stage enables fast decision-making, while the isolated-emitter NPN output stage allows flexible load referencing to ground, VCC+, or VCC− without requiring external level-shifting circuitry.

Strobe (BAL/STRB) and balance (BALANCE) pins provide active control over output disable and input offset trimming-critical for noise-immune zero-crossing detection and precision peak-hold circuits. The device operates across −40°C to +125°C, meeting Q-Temp automotive qualification requirements including configuration control and AEC-Q100 alignment.

Key Specifications

Pinout & Package

LM211QDG4 is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package measuring 4.90 mm × 3.91 mm, with standard JEDEC MS-012AC footprint and gull-wing leads. Thermal resistance RθJA = 114.3°C/W enables reliable operation at up to 5.1 mA supply current without forced airflow.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM211QDG4, LM311DR lacks automotive qualification and extended temperature support, while TLV3011DBVR trades off output strength and strobe functionality for microamp-level quiescent current-making LM211QDG4 the sole choice for robust, high-drive, temperature-hardened comparator applications.

Availability

LM211QDG4 is available at Aetrix Electronics and suitable for automotive body control modules, industrial relay drivers, precision peak detectors, and oscillator feedback circuits requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM211QDG4 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, embedded processing, and connectivity solutions with deep expertise in precision analog and automotive-grade IC design.

The LM211QDG4 belongs to TI's legacy high-speed comparator product line, engineered specifically for automotive and industrial applications demanding wide supply range, high-voltage tolerance, and robust temperature performance.

FAQ

What is the maximum operating temperature for LM211QDG4?

The LM211QDG4 is rated for continuous operation from −40°C to +125°C, meeting Q-Temp automotive qualification standards. This extended range supports under-hood placement in engine control units and transmission control modules where ambient temperatures exceed 105°C during peak load conditions. The device maintains specified electrical performance-including 165 ns response time and ≤7.5 mV input offset voltage-throughout this full range.

Does LM211QDG4 support single-supply operation?

Yes, LM211QDG4 supports true single-supply operation with VCC− tied to ground and VCC+ supplied from 3.5 V to 30 V. Its PNP input stage enables common-mode input voltage down to 0.3 V below ground (i.e., −0.3 V), allowing direct interface with ground-referenced sensors. The open-collector output (COL OUT) requires only an external pullup resistor to establish logic-high level-no negative rail needed for basic functionality.

How does the BAL/STRB pin function in LM211QDG4?

The BAL/STRB pin on LM211QDG4 serves dual roles: as a strobe input (active-low) and as a balance control node. When driven with −3 mA current, it forces the output into high-impedance state regardless of input differential-enabling synchronized blanking in time-multiplexed systems. As a balance pin, it connects to a potentiometer between VCC+ and VCC− to nullify input offset voltage, improving DC accuracy in precision threshold detection.

Can LM211QDG4 drive a 24-V relay directly?

Yes, LM211QDG4 can directly drive a 24-V relay coil via its COL OUT pin when configured with appropriate external components. With VCC+ = 24 V and VCC− = 0 V, the device supports up to 50 V collector-emitter voltage and 50 mA sink current. A series current-limiting resistor must be selected to ensure coil current remains within 50 mA, and a flyback diode is required across the coil to suppress inductive kickback that could damage the output transistor.

What is the purpose of the EMIT OUT pin on LM211QDG4?

The EMIT OUT pin on LM211QDG4 provides an emitter-follower output referenced to VCC−, offering low-impedance buffering and complementary drive capability to COL OUT. It enables direct connection to loads requiring sourcing current (e.g., LED anodes or MOSFET gates), while COL OUT sinks current. Both outputs can be used simultaneously-for example, driving push-pull logic stages-or independently for separate subsystems sharing the same comparator decision.