STMicroelectronics LM211DT

Overview

LM211DT from STMicroelectronics is a precision voltage comparator with strobe function, designed for high-voltage open-collector output switching in industrial control and power monitoring circuits. It operates from +5 V to ±15 V supply, delivers 50 mA output sink current, supports ±30 V differential input voltage, and features 150 nA max input bias current and 20 nA max offset current - enabling accurate threshold detection in noisy environments.

For engineers reviewing the LM211DT datasheet, LM211DT pinout, LM211DT application, or LM211DT equivalent, key selection criteria include its wide supply range (+5 V to ±15 V), ±30 V input differential tolerance, 200 ns response time at 5 mV overdrive, strobe-enabled output disable capability, and SO-8 package compatibility with legacy comparator layouts.

Technical Context

The LM211DT implements a bipolar transistor-based comparator core with internal strobe-controlled output stage, allowing full output disable via Pin 6 (Strobe). Its input stage uses matched NPN transistors to achieve low input bias (≤150 nA) and offset current (≤20 nA), critical for high-impedance sensing applications.

It supports rail-to-rail common-mode input range (–14.5 V to +13.8 V at ±15 V supplies), delivers 50 mA sink current into loads up to +50 V, and maintains stable operation across –40 °C to +105 °C - making it suitable for automotive-grade and industrial temperature-critical designs without external biasing.

Key Specifications

Pinout & Package

LM211DT is housed in an SO-8 (Small Outline, 8-pin) plastic micropackage per ECOPACK® specifications, with standard 1.27 mm pitch, gull-wing leads, and thermal resistance R_thJA = 175 °C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM311DT and TL311CDR, LM211DT uniquely combines extended temperature range (–40 °C to +105 °C) and integrated strobe control - eliminating external gating logic and enabling robust operation in harsh environments where timing synchronization and thermal reliability are critical.

Availability

LM211DT is available at Aetrix Electronics and suitable for overvoltage protection, motor current monitoring, programmable logic threshold detection, and industrial analog-to-digital interface applications requiring stable component supply across extended temperature ranges.

Supply support for LM211DT 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, specializing in automotive, industrial, and power management ICs with strong analog and mixed-signal design heritage.

The LM211 series belongs to ST's precision analog comparators product line, engineered specifically for high-reliability industrial control, power conversion, and safety-critical monitoring where wide supply range, temperature resilience, and strobe-synchronized operation are mandatory.

FAQ

What is the maximum output voltage the LM211DT can switch?

The LM211DT's open-collector output is rated for up to +50 V when sinking current, as confirmed in Absolute Maximum Ratings Table 2. This allows direct interfacing with 24 V and 48 V industrial control buses without external level-shifting components. The output remains functional up to this voltage regardless of supply configuration, provided load current stays within 50 mA limits and power dissipation remains below 710 mW.

Does the LM211DT require external pull-up resistors on its output?

Yes - the LM211DT features an open-collector NPN output (Pin 7), which requires an external pull-up resistor to define the high-state voltage level. Typical values range from 1 kΩ to 10 kΩ depending on load capacitance and required rise time. Pull-up voltage may exceed V+ (e.g., +24 V or +48 V), leveraging the device's +50 V output voltage rating, but must remain within absolute maximum limits.

How does the strobe pin (Pin 6) affect output behavior?

When Pin 6 (Strobe) is pulled low, the LM211DT's output transistor is fully disabled, placing Pin 7 in high-impedance (Hi-Z) state - independent of input conditions. When Pin 6 is high, normal comparator operation resumes. This enables precise timing control, such as blanking during switching transients or synchronizing comparisons to system clocks, without adding external logic gates or MOSFET switches.

Can the LM211DT operate from a single +5 V supply?

Yes - the LM211DT is explicitly specified to operate from a single +5 V supply, as stated in Operating Conditions Table 3 and Features list. At +5 V, it maintains full functionality including 50 mA output sink, ±30 V differential input range, and 200 ns response time. Input common-mode range extends from 0 V to ~3.8 V, supporting direct interface with 3.3 V or 5 V microcontroller references and sensors.