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Texas Instruments LM211DR
- Part No.:
- LM211DR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM211DR.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,307
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Product details
Overview
LM211DR from Texas Instruments is a single high-speed voltage comparator with open-collector output, designed for precision level detection and fast switching in industrial and embedded systems. It delivers 165 ns response time, supports ±15 V or single 5-V supply operation, and drives loads up to 50 V at 50 mA - used in zero-crossing detectors, oscillators, and relay drivers.
For engineers reviewing the LM211DR datasheet, LM211DR pinout, LM211DR application, or LM211DR equivalent, key selection criteria include its −40°C to +85°C operating range, strobe-enabled disable function, input bias current ≤300 nA, and compatibility with TTL/MOS logic interfaces.
Technical Context
The LM211DR uses a PNP input stage enabling rail-to-rail common-mode input down to VCC−, followed by high-gain amplification and an isolated-emitter NPN open-collector output stage. Its BAL/STRB pin enables external offset trimming or strobe-based output disable.
It operates as a pure voltage comparator - no internal hysteresis - requiring external feedback for controlled switching thresholds. Input offset voltage is specified at ≤7.5 mV (max), and common-mode input range spans −14.7 V to +13.8 V with ±15 V supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Response time | 165 ns (high-to-low); enables sub-6 MHz comparator-based oscillator designs |
| Input bias current | ≤300 nA (max); minimizes loading on high-impedance sensor or reference sources |
| Input offset voltage | ≤7.5 mV (max); defines minimum detectable differential voltage without trimming |
| Supply voltage range | 3.5 V to 30 V total (VCC+ − VCC−); supports single 5-V or dual ±15-V rails |
| Output drive capability | 50 V / 50 mA (collector); allows direct interface to relays, lamps, and optocouplers |
| Operating temperature | −40°C to +85°C; qualified for industrial and automotive body control applications |
| Strobe function | BAL/STRB pin sinks −3 mA to disable output; enables synchronized sampling or power gating |
Pinout & Package
LM211DR 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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: EMIT OUT | Emitter output terminal | Provides emitter-follower output referenced to VCC−; used for low-side level shifting or current sourcing |
| 2: IN+ | Noninverting input | Accepts signal to be compared against IN−; supports common-mode down to VCC− |
| 3: IN− | Inverting input | Reference or threshold input; differential comparison determines output state |
| 4: VCC− | Negative supply rail | Ground or negative bias reference; all inputs/outputs isolated from system ground |
| 5: BALANCE | Offset null adjustment | Connects to potentiometer wiper for manual input offset cancellation (±10 mV trim range) |
| 6: BAL/STRB | Strobe / balance select | Sinks −3 mA to force output high-impedance; also used for offset balancing when tied to VCC+ |
| 7: COL OUT | Collector output | Open-collector NPN output; requires external pullup to define logic-high level and sink current |
| 8: VCC+ | Positive supply rail | Supports 3.5–30 V total supply swing; powers internal circuitry and defines output pullup ceiling |
Key Features
| Feature | Design Value |
|---|---|
| Strobe-enabled output disable | Active-low BAL/STRB pin forces high-impedance output regardless of input state - critical for time-multiplexed sensing |
| Rail-to-rail input capability | PNP input stage accepts signals within 1.5 V of VCC−, enabling direct interface to low-voltage sensors or DAC outputs |
| Isolated output stage | Emitter and collector outputs are electrically isolated from VCC−, allowing load referencing to ground, VCC+, or VCC− |
| Wire-OR compatible output | Open-collector COL OUT supports wired-AND logic and multi-comparator arbitration without external diodes |
| Wide supply flexibility | Operates from 3.5 V to 30 V total supply - usable in 5-V logic systems, ±15-V analog circuits, and 24-V industrial rails |
Applications
| Zero-Crossing Detection | Oscillator & Timing Circuits |
|---|---|
|
Use Scenario: Detecting AC waveform polarity transitions in motor control or power supply feedback loops. IC Role / Device Role / Timing Role: Voltage comparator comparing sinusoidal input to ground reference; triggers on crossing point with <165 ns latency. Use Value: Enables precise phase-aligned switching in TRIAC dimmers and inverter gate drivers without added hysteresis components. |
Use Scenario: Generating stable square-wave clocks in relaxation oscillators or multivibrators. IC Role / Device Role / Timing Role: Core timing element in RC-feedback oscillator; strobe pin synchronizes startup or resets frequency. Use Value: Delivers jitter-free 100 kHz free-running output (per TI Figure 16) using only two resistors and one capacitor. |
| Relay & Solenoid Control | Industrial Level Shifting |
|
Use Scenario: Driving 24-V DC relays in PLC I/O modules or HVAC control panels. IC Role / Device Role / Timing Role: High-voltage comparator output directly switches relay coil via COL OUT with 50 mA sink capability. Use Value: Eliminates need for discrete transistor driver stages - reduces BOM count and PCB area in space-constrained enclosures. |
Use Scenario: Translating 3.3-V MCU GPIO signals to 12-V or 24-V control lines in factory automation. IC Role / Device Role / Timing Role: Level translator using COL OUT pullup to higher rail and EMIT OUT for low-side referencing. Use Value: Supports bidirectional voltage translation with <165 ns propagation delay - faster than standard logic-level shifters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM311DR | Lower temperature grade (0°C to +70°C); higher input offset voltage (≤10 mV max); same pinout and electrical specs otherwise | Not qualified for extended industrial environments; suitable for commercial-grade instrumentation or consumer electronics | Select LM311DR only if ambient temperature remains below 70°C and offset tolerance >7.5 mV is acceptable |
| TLV3011DBVR | Rail-to-rail input/output; 360 ns response; 1.8–5.5 V supply only; CMOS output (push-pull), not open-collector | Lacks high-voltage output drive (max 5.5 V); incompatible with 24-V relay loads or wire-OR bus topologies | Choose TLV3011DBVR only for low-power, single-supply, low-voltage portable systems where 50-V drive is unnecessary |
Compared with LM311DR and TLV3011DBVR, the LM211DR uniquely balances industrial temperature range, high-voltage open-collector drive, and strobe functionality - making it irreplaceable in relay-driven control systems requiring synchronized disable.
Availability
LM211DR is available at Aetrix Electronics and suitable for industrial automation, building control systems, and power conversion equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM211DR 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, embedded processing, and connectivity technologies, with over 90 years of innovation in industrial, automotive, and communications markets.
The LM211DR belongs to TI's legacy high-speed comparator family, engineered for robust performance in noisy industrial environments - emphasizing wide supply range, strobe control, and high-voltage output drive for real-world system interfacing.
FAQ
What is the maximum supply voltage the LM211DR can handle?
The LM211DR supports a total supply voltage (VCC+ − VCC−) up to 30 V, with individual rails rated to ±18 V. Absolute maximum ratings specify VCC+ ≤ +18 V and VCC− ≥ −18 V. Exceeding these limits risks permanent damage, per TI's SLCS007K datasheet Section 6.1.
Does the LM211DR have built-in hysteresis?
No, the LM211DR has no internal hysteresis. It is a pure comparator with no feedback path. External positive feedback must be added to introduce hysteresis for noise immunity in slow-moving or noisy input applications - as shown in TI's Figure 17 and Application Note SLOA019.
Can the LM211DR operate from a single 5-V supply?
Yes, the LM211DR is explicitly specified to operate from a single 5-V supply (VCC+ = 5 V, VCC− = 0 V). Its input common-mode range extends to within 0.5 V of VCC−, and output VOL is guaranteed ≤0.4 V at 8 mA sink current under this condition (Section 6.6, TA full range).
What is the purpose of the BAL/STRB pin on the LM211DR?
The BAL/STRB pin serves dual functions: as a strobe input (sinking −3 mA disables output) or as a balance terminal for offset nulling. When used as strobe, it forces COL OUT into high-impedance state independent of input; when used for balancing, it connects to a potentiometer to cancel input offset voltage (Section 5, Pin Functions).
How does the LM211DR differ from the LM311DR in practical design?
The LM211DR is rated for −40°C to +85°C operation and has tighter input offset voltage (≤7.5 mV vs. ≤10 mV for LM311DR). Both share identical pinout, package, and electrical specs except temperature range and offset - making LM211DR the preferred choice for industrial environments where reliability across thermal extremes is critical.
LM211DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 1
- Output Type:
- DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL
- Voltage - Supply, Single/Dual (±):
- 3.5V ~ 30V, ±1.75V ~ 15V
- :
- 3mV @ ±15V
- Voltage - Input Offset (Max):
- 0.1µA @ ±15V
- Current - Input Bias (Max):
- 50mA
- Current - Output (Typ):
- 6mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
LM211DR FAQ
1.How can I place an order for LM211DR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM211DR 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 LM211DR reliable?
The price and inventory of LM211DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM211DR is usually 5 days.
3.What payment methods are accepted for LM211DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM211DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM211DR?
LM211DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM211DR 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 LM211DR?
For technical support, including LM211DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM211DR requirements.
6.How does Aetrix verify that LM211DR is sourced from the original manufacturer or authorized distributors?
All LM211DR 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 LM211DR meets industry standards.
7.What is the process for return or replacement of LM211DR?
All LM211DR units undergo pre-shipment inspection (PSI). If there is an issue with LM211DR, 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 LM211DR part is unused and in its original packaging.
Return procedure for LM211DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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