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Texas Instruments LM211QDR
- Part No.:
- LM211QDR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM211QDR.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:956
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Product details
Overview
LM211QDR from Texas Instruments is a single high-speed voltage comparator with open-collector output, designed for precision level detection in industrial and automotive systems. It delivers 165 ns response time, supports ±15 V or single 5-V supply operation, and features strobe control and offset balancing. It drives loads up to 50 V at 50 mA and operates across –40°C to +125°C.
For engineers reviewing the LM211QDR datasheet, LM211QDR pinout, LM211QDR application, or LM211QDR equivalent, this page provides verified electrical specifications, validated pin functions, confirmed automotive-grade temperature performance, and real-world use cases in relay control, zero-crossing detection, and TTL/MOS interface design.
Technical Context
The LM211QDR uses a PNP input stage enabling input common-mode range down to VCC– – 0.7 V, supporting rail-to-rail sensing near negative supply. Its high-gain internal stage ensures fast decision-making, while the isolated-emitter NPN output stage allows flexible load referencing - to ground, VCC+, or VCC−.
Strobe (BAL/STRB) enables synchronous comparison gating with –3 mA to –5 mA current drive; BALANCE supports external offset trimming. The device supports wire-OR outputs and is fully compatible with TTL, DTL, RTL, and MOS logic families without level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Response time | 165 ns (high-to-low), measured at ±15 V supply with 5-mV overdrive and 5-pF load - enables sub-6-MHz comparator-based oscillator designs |
| Input offset voltage | Max 7.5 mV at 25°C - defines minimum detectable differential voltage before output switching |
| Input bias current | Max 300 nA at full temperature range - permits high-impedance sensor interfacing without significant loading error |
| Supply voltage range | 3.5 V to 30 V total (VCC+ – VCC−) - supports single 5-V logic rails and dual ±15-V op-amp supplies |
| Output capability | 50 V / 50 mA collector output - directly drives relays, lamps, optocouplers, and MOS gate drivers without external transistors |
| Operating temperature | –40°C to +125°C - qualified for Q-Temp automotive applications including body control modules and powertrain subsystems |
| ESD rating | ±500 V HBM - meets standard manufacturing ESD control requirements per JS-001 |
Pinout & Package
LM211QDR is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package measuring 4.90 mm × 3.91 mm, with surface-mount gull-wing leads and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: EMIT OUT | Emitter output terminal | Provides low-side emitter-follower output referenced to VCC−; used for level-shifted or current-sinking configurations |
| 2: IN+ | Noninverting input | Accepts reference or signal voltage; common-mode range extends to VCC− – 0.7 V |
| 3: IN− | Inverting input | Accepts threshold or feedback voltage; differential comparison determines output state |
| 4: VCC− | Negative supply pin | Reference node for internal circuitry and emitter output; supports ground-referenced or split-supply operation |
| 5: BALANCE | Offset null adjustment | Connects external potentiometer (typically 10 kΩ) between VCC+ and VCC− to trim input offset voltage |
| 6: BAL/STRB | Strobe control input | Sinks –3 mA to –5 mA to disable output (force high-Z); must not be shorted to ground |
| 7: COL OUT | Collector output terminal | Open-collector NPN output; requires external pullup to define logic-high level and drive capability |
| 8: VCC+ | Positive supply pin | Primary power rail; sets upper bound of common-mode input range and output swing capability |
Key Features
| Feature | Design Value |
|---|---|
| Strobe-enabled comparison gating | Enables time-synchronized sampling in multiplexed sensor systems or noise-immune burst-mode operation |
| Wide supply voltage compatibility | Operates from 3.5 V to 30 V total supply - eliminates need for separate voltage regulators in mixed-rail systems |
| Isolated output stage | COL OUT and EMIT OUT can drive loads referenced to ground, VCC+, or VCC− - simplifies interface to diverse logic families |
| Offset balancing | External trimming via BALANCE pin achieves <1 mV residual offset - critical for precision threshold detection |
| Wire-OR output capability | Multiple LM211QDR outputs can share a single pullup resistor - enables priority encoding or OR logic without external gates |
Applications
| Relay Control Interface | Zero-Crossing Detection |
|---|---|
|
Use Scenario: Driving electromagnetic relays in HVAC controllers and industrial PLC I/O modules. IC Role / Device Role / Timing Role: Voltage comparator detecting when AC line voltage crosses 0 V with hysteresis-free precision. Use Value: Eliminates mechanical contact arcing by switching relays only at zero voltage, extending relay life and reducing EMI. |
Use Scenario: Synchronizing microcontroller ADC sampling or triac firing in dimmer circuits and motor phase control. IC Role / Device Role / Timing Role: Fast-response comparator generating clean digital edge aligned to AC waveform zero crossings. Use Value: 165 ns propagation delay ensures timing jitter <1 µs at 50/60 Hz - enabling precise phase-angle control. |
| TTL/MOS Logic Level Translation | Peak Detector Circuit |
|
Use Scenario: Interfacing 3.3-V or 5-V MCU GPIOs to 12-V or 24-V industrial sensors and actuators. IC Role / Device Role / Timing Role: Level-shifting comparator translating logic thresholds across non-matching supply domains. Use Value: Open-collector output with programmable pullup allows direct connection to 5-V, 12-V, or 24-V logic buses without resistive dividers. |
Use Scenario: Capturing maximum amplitude of analog signals in battery-powered instrumentation and audio peak meters. IC Role / Device Role / Timing Role: High-speed comparator controlling diode-capacitor hold circuit with minimal droop error. Use Value: 300 nA max input bias current prevents capacitor discharge during hold phase - sustaining accuracy over >100 ms intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM311DR | Wider input offset voltage (max 7.5 mV vs. LM211QDR's 7.5 mV), but rated only to +70°C (vs. +125°C) | Limited to commercial-temperature environments; unsuitable for under-hood automotive or industrial enclosures | Select LM311DR only for cost-sensitive, non-automotive applications where ambient temperature stays below 70°C |
| TLV3011DBVR | Rail-to-rail input, 2.7-V to 16-V supply, 350-ns response, but 50-µA quiescent current and no strobe/BALANCE pins | Optimized for ultra-low-power battery systems; lacks strobe gating and offset trimming required for precision timing | Choose TLV3011DBVR for portable equipment with tight power budgets, but retain LM211QDR for strobed or high-voltage industrial use |
Compared with LM311DR and TLV3011DBVR, the LM211QDR uniquely combines automotive-grade temperature range (–40°C to +125°C), strobe control, offset trimming, and 50-V output drive - making it the only option for safety-critical, high-voltage, time-gated comparator applications in harsh environments.
Availability
LM211QDR is available at Aetrix Electronics and suitable for relay driver circuits, zero-crossing detectors, TTL/MOS interface designs, and peak detector systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM211QDR 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 over 50 years of innovation in precision analog ICs and automotive-qualified components.
The LM211QDR belongs to TI's legacy high-speed comparator product line, engineered specifically for robust, high-voltage, temperature-stable decision-making in automotive body electronics, industrial controls, and power management systems.
FAQ
What is the operating temperature range of the LM211QDR?
The LM211QDR is specified for operation from –40°C to +125°C. This Q-Temp automotive qualification makes it suitable for under-hood applications, engine control units, and industrial environments where extended thermal stability is required. The "Q" suffix explicitly denotes this enhanced temperature grade, distinguishing it from the standard LM211 (–40°C to +85°C) and LM311 (0°C to +70°C).
Can the LM211QDR operate from a single 5-V supply?
Yes, the LM211QDR supports single-supply operation with VCC+ = 5 V and VCC− = 0 V (ground). In this configuration, the input common-mode range extends from 0.5 V to 3.5 V, and the output can sink up to 50 mA with VOL ≤ 0.4 V at 8 mA load. This enables direct interfacing with 5-V logic systems without level shifters or dual supplies.
How does the BAL/STRB pin function on the LM211QDR?
The BAL/STRB pin on the LM211QDR serves dual roles: as a strobe input (when driven with –3 mA to –5 mA current) to force the output into high-impedance state, or as a balance control point for offset trimming when left open or connected to external circuitry. It must never be shorted to ground - current sinking is required for strobe activation, and improper connection risks latch-up or undefined behavior.
What is the maximum output voltage the LM211QDR can switch?
The LM211QDR's COL OUT pin can switch voltages up to 50 V when referenced to VCC−, as confirmed in Absolute Maximum Ratings. This allows direct driving of 24-V solenoids, 48-V telecom loads, or optocoupler inputs without external transistor stages. The output remains functional even with VCC− grounded and VCC+ at 5 V, provided the load is pulled up to a higher rail (e.g., 24 V).
Does the LM211QDR support wire-OR output configurations?
Yes, the LM211QDR's open-collector COL OUT enables true wire-OR functionality. Multiple LM211QDR outputs can share a single pullup resistor to a common logic rail, producing a logical OR of their individual comparison results. This is commonly used in priority encoder circuits, fault-bus monitoring, and multi-sensor alarm aggregation without additional logic gates.
LM211QDR 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 ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
LM211QDR FAQ
1.How can I place an order for LM211QDR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM211QDR 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 LM211QDR reliable?
The price and inventory of LM211QDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM211QDR is usually 5 days.
3.What payment methods are accepted for LM211QDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM211QDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM211QDR?
LM211QDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM211QDR 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 LM211QDR?
For technical support, including LM211QDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM211QDR requirements.
6.How does Aetrix verify that LM211QDR is sourced from the original manufacturer or authorized distributors?
All LM211QDR 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 LM211QDR meets industry standards.
7.What is the process for return or replacement of LM211QDR?
All LM211QDR units undergo pre-shipment inspection (PSI). If there is an issue with LM211QDR, 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 LM211QDR part is unused and in its original packaging.
Return procedure for LM211QDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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