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Texas Instruments LM211QDRQ1
- Part No.:
- LM211QDRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM211QDRQ1.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,552
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Product details
Overview
LM211QDRQ1 from Texas Instruments is a single high-speed voltage comparator qualified for automotive applications (−40°C to 125°C), featuring 115 ns low-to-high response time, 3 mV max input offset voltage at 25°C, and strobe-enabled output disable capability. It operates from ±15 V or single 5-V supplies and drives TTL/MOS loads, relays, or lamps up to 50 V / 50 mA - used in precision zero-crossing detection and PWM timing circuits.
For engineers reviewing the LM211QDRQ1 datasheet, LM211QDRQ1 pinout, LM211QDRQ1 application, or LM211QDRQ1 equivalent, key selection criteria include its automotive-grade temperature range, dual-output transistor configuration (collector and emitter open-drain), strobe-controlled output isolation, and compatibility with both bipolar and single-supply logic interfaces.
Technical Context
The LM211QDRQ1 implements a bipolar transistor-based differential input stage with internal balance/strobe control logic that forces output into high-impedance state when BAL/STRB is actively pulled low. Its dual-output structure (COL OUT and EMIT OUT) enables flexible load referencing - to VCC+, VCC−, or ground - without requiring external pull-up resistors for all configurations.
It supports wide common-mode input range (−14.7 V to +13.8 V at full temperature range) and delivers rail-to-rail output swing capability under specified load conditions. Input bias current remains ≤150 nA across −40°C to 125°C, enabling high-impedance sensing in battery-powered or precision threshold-detection systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.5 V to 30 V total (VCC+ − VCC−); supports ±15 V or single 5-V operation - enables direct interface with legacy op-amp rails and modern 5-V logic systems. |
| Input Offset Voltage | Max 4 mV over full temperature range - ensures stable threshold accuracy in automotive sensor signal conditioning without trimming. |
| Response Time | 115 ns (low-to-high), 165 ns (high-to-low) with 5-mV overdrive - suitable for sub-10 MHz window comparators and fast fault-detection circuits. |
| Output Drive Capability | 50 V collector-to-emitter breakdown, 50 mA sink current - directly switches automotive solenoids, relays, or LED arrays without external drivers. |
| Strobe Function | BAL/STRB pin disables output when pulled to −3 mA - provides hardware-gated comparison for synchronized sampling or power sequencing control. |
| Input Bias Current | Max 150 nA over full temperature range - preserves signal integrity in high-source-impedance applications like thermistor or photodiode front-ends. |
| Operating Temperature | −40°C to +125°C - meets AEC-Q100 Grade 1 requirements for engine control, ADAS sensor modules, and body electronics. |
Pinout & Package
LM211QDRQ1 is housed in an 8-pin SOIC (D) package (5.00 mm × 6.20 mm, 1.75 mm max height), RoHS-compliant with NiPdAu lead finish and JEDEC MS-012AA compliance. Pin spacing is 1.27 mm, with pin 1 marked by a beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BAL/STRB | Balance/Strobe control input | Active-low strobe: pulls output to high-Z when driven with −3 mA; also used for offset nulling via external resistor network. |
| 2 - IN− | Inverting input | Differential input node referenced to internal bias network; accepts common-mode voltages from −14.7 V to +13.8 V. |
| 3 - IN+ | Non-inverting input | Differential input node with identical common-mode range as IN−; supports precision threshold setting with low input current error. |
| 4 - VCC− | Negative supply rail | Reference for internal circuitry and emitter output; supports dual-supply (±15 V) or single-supply (0 V) configurations. |
| 5 - EMIT OUT | Emitter output terminal | Open-emitter output capable of sinking current to VCC− or ground; requires external pull-up to define logic high level. |
| 6 - COL OUT | Collector output terminal | Open-collector output rated for 50 V breakdown; sinks current to VCC− or ground - compatible with TTL, MOS, and relay coils. |
| 7 - BALANCE | Offset nulling terminal | Connects to external potentiometer for manual input offset adjustment; tied to BAL/STRB when strobe not used. |
| 8 - VCC+ | Positive supply rail | Power input for internal circuitry and output stage; supports up to 18 V absolute max, enabling wide-input-range industrial designs. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | Qualified per AEC-Q100 Grade 1 (−40°C to +125°C), with production flow including HTOL, ESD, and thermal cycling - suitable for under-hood ECUs and ADAS modules. |
| Dual independent outputs | Separate COL OUT and EMIT OUT pins allow simultaneous drive of two different load types (e.g., TTL logic + relay coil) with independent reference points. |
| Strobe-enabled output disable | Hardware-level output blanking via BAL/STRB eliminates need for software gating or external FET switches in time-critical safety monitoring paths. |
| Wide supply flexibility | Operates from 3.5 V to 30 V total supply range - supports legacy ±15 V analog systems and modern 5-V microcontroller domains without level-shifting. |
| High-voltage output capability | 50 V collector-emitter breakdown enables direct interface with 24-V automotive loads and industrial PLC I/O modules without buffer stages. |
Applications
| Engine Speed Sensing | Battery Management System (BMS) |
|---|---|
|
Use Scenario: Detecting zero-crossings of crankshaft position sensor signals in ICE engine control units. IC Role / Device Role / Timing Role: High-speed comparator converting analog sine-wave magnetic pickup output into clean digital timing pulses for ECU crank-angle calculation. Use Value: 115 ns response time ensures accurate edge placement at 10,000 RPM; strobe function synchronizes sampling with ignition events to suppress noise during spark discharge. |
Use Scenario: Monitoring cell voltage thresholds in 12S Li-ion battery packs for overvoltage and undervoltage protection. IC Role / Device Role / Timing Role: Precision voltage window detector comparing cell voltage against reference to trigger disconnect FETs or alert MCU. Use Value: 3 mV max input offset voltage minimizes false trips across temperature; 150 nA input bias avoids loading high-impedance voltage dividers in passive balancing networks. |
| Industrial Motor Control | Automotive Lighting Control |
|
Use Scenario: Implementing current-limit shutdown in three-phase inverter gate drivers using shunt amplifier outputs. IC Role / Device Role / Timing Role: Fast-response comparator detecting overcurrent faults and disabling PWM signals within microseconds to protect IGBTs. Use Value: Dual outputs allow one pin to drive logic-level disable signal while the other controls optocoupler LED - enabling isolated fault reporting and local latch. |
Use Scenario: Controlling adaptive LED headlight dimming based on ambient light and forward vehicle detection signals. IC Role / Device Role / Timing Role: Threshold comparator converting photodiode current into ON/OFF command for LED driver ICs in AHB (Adaptive Driving Beam) systems. Use Value: Strobe capability allows MCU-synchronized sampling to reject PWM interference from nearby displays; automotive temp rating ensures reliability in sealed headlamp housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV1701QDRQ1 | Rail-to-rail input, 1.8-V to 36-V supply, 1.2 µs response time, CMOS output - slower but lower power and wider supply range. | Better suited for ultra-low-power battery sensors; lacks dual-output flexibility and 50-V breakdown capability. | Select TLV1701QDRQ1 when supply voltage varies widely (e.g., 3.3 V to 24 V) and speed < 1 MHz suffices; avoid for relay/solenoid drive. |
| LM311QDRQ1 | Same pinout and core architecture; higher 7.5 mV max offset voltage, 200 ns response time, non-automotive grade (−25°C to +85°C). | Cost-optimized for non-automotive industrial use; lacks AEC-Q100 qualification and extended temperature support. | Choose LM311QDRQ1 only for cost-sensitive non-automotive designs where 125°C operation and tight offset are not required. |
Compared with LM211QDRQ1, TLV1701QDRQ1 trades speed and output drive strength for broader supply range and lower quiescent current, while LM311QDRQ1 offers identical functionality at lower qualification level - making LM211QDRQ1 the sole choice for AEC-Q100-compliant, high-voltage, fast-response automotive sensing.
Availability
LM211QDRQ1 is available at Aetrix Electronics and suitable for automotive engine control units, battery management systems, industrial motor drives, and adaptive lighting systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM211QDRQ1 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets since 1930.
The LM211-Q1 product line was designed specifically for automotive signal-conditioning applications requiring high-speed, high-voltage comparators with AEC-Q100 qualification and robust ESD tolerance in harsh environments.
FAQ
What is the maximum supply voltage rating for LM211QDRQ1?
The LM211QDRQ1 supports a maximum total supply voltage (VCC+ − VCC−) of 36 V, with individual rail limits of +18 V on VCC+ and −18 V on VCC−. Absolute maximum ratings must not be exceeded even momentarily - sustained operation above 30 V total supply is outside recommended conditions and may impact long-term reliability. Always refer to the absolute maximum ratings table in the SLCS143A datasheet for safe design margins.
Does LM211QDRQ1 support single-supply operation?
Yes, LM211QDRQ1 supports true single-supply operation down to 3.5 V total supply (e.g., VCC+ = 5 V, VCC− = 0 V). In this configuration, the common-mode input range extends from 0.5 V to 3.5 V, and the emitter output can sink to ground while the collector output requires an external pull-up. The device maintains 3 mV max input offset and 115 ns response time under these conditions, as verified in the recommended operating conditions table.
How does the BAL/STRB pin function in LM211QDRQ1?
The BAL/STRB pin on LM211QDRQ1 serves dual roles: as a strobe input (active-low, −3 mA drive required) to force both outputs into high-impedance state, and as a balance terminal for offset nulling via external resistor. When used for strobing, it overrides all input conditions - output remains off regardless of IN+ or IN− voltage. TI explicitly warns against shorting this pin to ground; it must be current-driven per Figure 13 in the datasheet.
Can LM211QDRQ1 drive a 24-V relay directly?
Yes, LM211QDRQ1 can directly drive a 24-V relay coil using its COL OUT pin, which is rated for 50 V collector-emitter breakdown and 50 mA sink current. With VCC− tied to ground and VCC+ ≥ 24 V, the output pulls the relay coil low while the other end connects to +24 V. Ensure relay coil current stays ≤50 mA and include a flyback diode - the LM211QDRQ1 itself does not integrate clamp protection.
What is the input bias current specification for LM211QDRQ1 over temperature?
The LM211QDRQ1 has a maximum input bias current of 150 nA across its full operating temperature range (−40°C to +125°C), as specified in the electrical characteristics table. This value is confirmed in both the "Full range" row for IIB and supported by Figure 2 showing typical bias current staying below 120 nA at 125°C. This stability enables reliable operation in high-impedance sensor interfaces without significant voltage error.
LM211QDRQ1 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:
- Automotive
- Grade:
- AEC-Q100
- Qualification:
- Surface Mount
- :
- 8-SOIC
LM211QDRQ1 FAQ
1.How can I place an order for LM211QDRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM211QDRQ1 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 LM211QDRQ1 reliable?
The price and inventory of LM211QDRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM211QDRQ1 is usually 5 days.
3.What payment methods are accepted for LM211QDRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM211QDRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM211QDRQ1?
LM211QDRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM211QDRQ1 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 LM211QDRQ1?
For technical support, including LM211QDRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM211QDRQ1 requirements.
6.How does Aetrix verify that LM211QDRQ1 is sourced from the original manufacturer or authorized distributors?
All LM211QDRQ1 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 LM211QDRQ1 meets industry standards.
7.What is the process for return or replacement of LM211QDRQ1?
All LM211QDRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM211QDRQ1, 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 LM211QDRQ1 part is unused and in its original packaging.
Return procedure for LM211QDRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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