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Texas Instruments LM211QDRRB
- Part No.:
- LM211QDRRB
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM211QDRRB.pdf
- Description:
- PROTOTYPE
- Quantity:
- Payment:
- Shipping:
Inventory:3,786
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Product details
Overview
LM211QDRRB from Texas Instruments is a high-speed differential 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, features strobe control (BAL/STRB), and drives loads up to 50 V at 50 mA - used in zero-crossing detectors, peak detectors, and oscillator circuits.
For engineers reviewing the LM211QDRRB datasheet, LM211QDRRB pinout, LM211QDRRB application, or LM211QDRRB equivalent, this page provides verified technical context, real-world design meanings for key specs, validated pin functions, automotive-grade thermal and electrical performance data, and two confirmed alternative comparators with documented functional differences.
Technical Context
The LM211QDRRB 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 BALANCE and BAL/STRB pins support external offset trimming and synchronous enable/disable control.
It operates across −40°C to +125°C (Q-temp automotive grade), with input bias current ≤300 nA, input offset voltage ≤7.5 mV, and common-mode input range of −14.7 V to +13.8 V under ±15 V supplies - enabling robust comparison in noisy, wide-voltage industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Response Time | 165 ns high-to-low (±15 V, 100-mV step, 5-mV overdrive) - enables accurate timing in >1 MHz oscillator and pulse-width modulation circuits. |
| 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 without level-shifting. |
| Input Offset Voltage | Max 7.5 mV at 25°C - defines minimum detectable voltage difference before compensation; impacts accuracy in precision threshold detection. |
| Input Bias Current | Max 300 nA over full temperature range - ensures minimal loading on high-impedance sensor inputs like photodiodes or RTDs. |
| Output Drive Capability | 50 V / 50 mA collector output - directly switches relays, lamps, or MOSFET gates without external driver stages. |
| Strobe Input Current | −3 mA to −5 mA sink required on BAL/STRB - enables synchronized multi-comparator operation or power-gated sensing. |
| Operating Temperature | −40°C to +125°C - qualified per automotive Q-temp standards for under-hood and body control module deployment. |
Pinout & Package
LM211QDRRB is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with gull-wing leads and surface-mount compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: EMIT OUT | Emitter output terminal | Provides low-side switching reference; connects to load ground or negative rail - enables floating-load configurations. |
| 2: IN+ | Noninverting input | Accepts reference or signal input; common-mode range extends to VCC− - ideal for ground-referenced sensors. |
| 3: IN− | Inverting input | Accepts comparison signal; differential input tolerance ±30 V - withstands transient coupling in motor-control feedback. |
| 4: VCC− | Negative supply pin | Reference for internal circuitry and emitter output; must be connected even in single-supply use (e.g., tied to GND). |
| 5: BALANCE | Offset null adjustment | Connects to potentiometer wiper for manual VIO trimming - critical for <10 mV threshold accuracy in precision analog front-ends. |
| 6: BAL/STRB | Strobe control input | Sinks −3 mA to disable output regardless of input state - enables time-sliced sampling or noise-immune gated comparison. |
| 7: COL OUT | Collector output (open-drain) | Drives external pull-up; supports wire-OR logic and mixed-voltage interfacing (e.g., 5-V logic driving 24-V PLC inputs). |
| 8: VCC+ | Positive supply pin | Power for internal amplifier and output stage; decoupling capacitor (0.1 µF) mandatory for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Strobe capability | Hardware-enforced output disable via BAL/STRB pin - eliminates false triggers during system initialization or fault recovery. |
| Rail-to-rail input stage | PNP input allows common-mode voltage down to VCC− - enables direct interface with current-sense resistors or battery-monitoring shunts. |
| Isolated emitter output | EMIT OUT pin electrically separates output load reference from VCC− - permits driving loads referenced to any rail (GND, VCC+, or VCC−). |
| Wire-OR compatible output | Open-collector COL OUT supports multiple comparators sharing one pull-up - simplifies priority encoder or alarm-or logic in safety systems. |
| Automotive Q-temp qualification | Tested per AEC-Q100 requirements across −40°C to +125°C - ensures reliability in engine control units and ADAS sensor modules. |
Applications
| Zero-Crossing Detection | Oscillator Circuits |
|---|---|
Use Scenario: Detecting AC line polarity transitions in motor phase control or SMPS synchronization. IC Role / Device Role / Timing Role: Voltage comparator comparing sinusoidal input against 0-V reference with fast edge response. Use Value: 165 ns propagation delay ensures sub-microsecond timing resolution; open-collector output interfaces directly with MCU interrupt pins or TRIAC drivers. |
Use Scenario: Building free-running multivibrators or crystal-based clock generators for timing references. IC Role / Device Role / Timing Role: Core switching element in hysteresis-based relaxation oscillators with programmable frequency. Use Value: Strobe (BAL/STRB) enables external frequency gating; 50-V output swing supports high-Q crystal drive into capacitive loads. |
| Peak Detection | Relay/Solenoid Control |
Use Scenario: Capturing maximum amplitude of analog sensor signals (e.g., vibration, pressure transients) in condition monitoring. IC Role / Device Role / Timing Role: Comparator latching peak voltage onto hold capacitor via diode/FET switch control. Use Value: Low input bias current (≤300 nA) prevents capacitor discharge drift; wide supply range accommodates 12–24 V industrial sensor rails. |
Use Scenario: Driving electromagnetic relays or solenoids in HVAC actuators, industrial valves, or automotive body modules. IC Role / Device Role / Timing Role: High-voltage interface between low-power logic and inductive loads. Use Value: 50 V / 50 mA output rating eliminates need for external transistor; isolated emitter (EMIT OUT) enables common-cathode relay coil configurations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM311DR | Commercial-grade (0°C to +70°C); lower max input offset voltage (2 mV vs. 7.5 mV), but no Q-temp qualification. | Not rated for automotive under-hood or extended-temperature industrial use; suitable for consumer electronics and lab equipment. | Select LM311DR only when ambient temperature stays within 0–70°C and AEC-Q100 compliance is unnecessary. |
| TLV3011IDBVR | Rail-to-rail input/output, 360-ns response, 1.8–5.5 V supply only; CMOS output replaces open-collector; no strobe or balance pins. | Optimized for ultra-low-power, single-supply battery systems; lacks high-voltage drive and strobe synchronization capability. | Choose TLV3011IDBVR for portable devices requiring nanowatt quiescent current and 3.3-V logic compatibility - not for 24-V industrial loads. |
Compared with LM211QDRRB, LM311DR offers tighter offset but lacks automotive temperature range and qualification, while TLV3011IDBVR trades high-voltage drive and strobe control for ultra-low power and rail-to-rail operation - making LM211QDRRB uniquely suited for ruggedized, high-voltage, synchronized comparator roles.
Availability
LM211QDRRB is available at Aetrix Electronics and suitable for automotive body control modules, industrial motor drives, and building automation systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM211QDRRB 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 and embedded processing technologies, with decades of expertise in high-reliability industrial and automotive ICs.
The LM211QDRRB belongs to TI's legacy high-speed comparator family, engineered for robust voltage comparison in harsh environments - emphasizing wide supply range, strobe control, and high-voltage output drive for industrial and automotive signal conditioning.
FAQ
What is the operating temperature range of the LM211QDRRB?
The LM211QDRRB is qualified for operation from −40°C to +125°C, meeting Texas Instruments' Q-temp automotive standard. This extended range supports deployment in engine compartments, powertrain control units, and industrial environments where ambient temperatures exceed commercial-grade limits. The LM211QDRRB maintains specified electrical performance - including input offset voltage and response time - across this full range.
How does the BAL/STRB pin function in the LM211QDRRB?
The BAL/STRB pin on the LM211QDRRB serves dual purposes: as a strobe input to force the output into high-impedance state (when sunk with −3 mA to −5 mA), and as a balance control point for offset nulling when used with an external potentiometer. When used as strobe, it overrides all input conditions - ensuring deterministic output disable during system reset or synchronized sampling windows in the LM211QDRRB.
Can the LM211QDRRB operate from a single 5-V supply?
Yes, the LM211QDRRB can operate from a single 5-V supply (with VCC− connected to ground). Its input common-mode range extends to VCC−, and its output remains functional with pull-up to 5 V. However, VCC− must be explicitly connected - it cannot be left floating - and the 5-V configuration still supports the full −40°C to +125°C operating range and all specified performance parameters of the LM211QDRRB.
What is the maximum output voltage and current capability of the LM211QDRRB?
The LM211QDRRB's COL OUT pin supports up to 50 V across the collector-emitter path and can sink up to 50 mA continuously. This is verified under recommended operating conditions (VCC+ − VCC− ≤ 30 V) and applies to both dual-supply and single-supply configurations. The EMIT OUT pin further enables load referencing to any rail, allowing the LM211QDRRB to drive 24-V relays or 48-V industrial loads with appropriate external components.
Does the LM211QDRRB require external passive components for basic operation?
Yes - the LM211QDRRB requires at minimum a 0.1-µF ceramic bypass capacitor between VCC+ and VCC−, and a pull-up resistor on COL OUT (typically 1–10 kΩ to VCC+ or logic rail). If offset trimming is needed, a 10-kΩ potentiometer is connected between BALANCE, VCC+, and VCC−. For strobe operation, a current-source driver (e.g., transistor or logic gate with current-limiting resistor) must sink −3 mA into BAL/STRB - these are essential for stable, repeatable performance of the LM211QDRRB.
LM211QDRRB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Differential
- Number of Elements:
- 1
- Output Type:
- Open-Collector, Open-Emitter
- Voltage - Supply, Single/Dual (±):
- 3.5V ~ 30V, ±1.75V ~ 15V
- :
- 3mV @ ±15V
- Voltage - Input Offset (Max):
- 0.1µA @ ±15V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 5mA, 6mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- 165ns (Typ)
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
LM211QDRRB FAQ
1.How can I place an order for LM211QDRRB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM211QDRRB 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 LM211QDRRB reliable?
The price and inventory of LM211QDRRB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM211QDRRB is usually 5 days.
3.What payment methods are accepted for LM211QDRRB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM211QDRRB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM211QDRRB?
LM211QDRRB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM211QDRRB 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 LM211QDRRB?
For technical support, including LM211QDRRB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM211QDRRB requirements.
6.How does Aetrix verify that LM211QDRRB is sourced from the original manufacturer or authorized distributors?
All LM211QDRRB 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 LM211QDRRB meets industry standards.
7.What is the process for return or replacement of LM211QDRRB?
All LM211QDRRB units undergo pre-shipment inspection (PSI). If there is an issue with LM211QDRRB, 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 LM211QDRRB part is unused and in its original packaging.
Return procedure for LM211QDRRB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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