My Inquiry
My Account
Texas Instruments LM211QD
- Part No.:
- LM211QD
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM211QD.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,569
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM211QD 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 +85°C.
For engineers reviewing the LM211QD datasheet, LM211QD pinout, LM211QD application, or LM211QD equivalent, this page provides verified electrical parameters, thermal metrics, strobe timing behavior, open-collector drive capability, and automotive-grade temperature range validation - all critical for comparator selection in noise-immune sensing, zero-crossing detection, and relay/solenoid interface designs.
Technical Context
The LM211QD uses a PNP input stage enabling input common-mode operation down to VCC– – 0.2 V, supporting rail-to-rail sensing in dual-supply configurations. Its high-gain internal amplifier enables fast decision-making on small differential inputs, while the isolated-emitter NPN output stage allows flexible load referencing (ground, VCC+, or VCC–).
Strobe functionality is implemented as a current-sink input (–3 mA typical), disabling output regardless of input differential when active. Offset adjustment is supported via external resistor network between BALANCE and BAL/STRB pins, enabling trimming of input offset voltage up to ±7.5 mV over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Response time | 165 ns high-to-low; enables sub-6 MHz comparator-based oscillator or pulse-width measurement. |
| Input offset voltage | Max 7.5 mV at 25°C; defines minimum detectable voltage difference without trimming. |
| Input bias current | Max 300 nA; ensures minimal loading on high-impedance sensor sources like thermistors or photodiodes. |
| Supply voltage range | 3.5 V to 30 V total (VCC+ – VCC–); supports single 5-V logic rails or ±15-V op-amp supplies. |
| Output drive capability | 50 V / 50 mA collector output; directly switches relays, lamps, or MOSFET gates without buffer stages. |
| Operating temperature | –40°C to +85°C; qualified for under-hood automotive and industrial control environments. |
| ESD rating (HBM) | ±500 V; meets standard handling requirements for production assembly lines. |
Pinout & Package
LM211QD is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package measuring 4.90 mm × 3.91 mm, with gull-wing leads and standard JEDEC MS-012AC footprint. The package supports reflow soldering and offers moderate thermal resistance (RθJA = 114.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: EMIT OUT | Emitter output terminal | Provides low-side switching path referenced to VCC–; used for emitter-follower output or wired-OR with other comparators. |
| 2: IN+ | Noninverting input | Accepts reference or signal voltage; common-mode range extends to VCC– + 0.5 V. |
| 3: IN− | Inverting input | Accepts sensed signal or threshold; differential comparison determines output state. |
| 4: VCC− | Negative supply rail | Reference for internal circuitry and EMIT OUT; required even in single-supply operation (tied to ground). |
| 5: BALANCE | Offset null adjustment | Connects to external potentiometer wiper for manual trimming of input offset voltage. |
| 6: BAL/STRB | Strobe control input | Sinks –3 mA to disable output; must be current-driven, not shorted to ground. |
| 7: COL OUT | Collector output terminal | Open-collector NPN output; requires external pullup for logic-level compatibility with TTL/MOS. |
| 8: VCC+ | Positive supply rail | Supplies internal circuitry; supports voltages up to +18 V relative to VCC−. |
Key Features
| Feature | Design Value |
|---|---|
| Strobe-enabled output disable | Guarantees output high-impedance state during system reset or synchronization windows without external logic. |
| Isolated emitter output | Enables load connection to VCC+, VCC−, or ground - critical for floating-sense applications like motor phase monitoring. |
| Wire-OR compatible outputs | Allows multiple LM211QD devices to share a single pullup resistor for priority encoding or alarm aggregation. |
| Wide supply flexibility | Operates from 3.5 V to 30 V total supply - eliminates need for separate voltage regulators in mixed-voltage systems. |
| Automotive-grade qualification | Q-Temp variant meets AEC-Q100 stress test requirements for body control modules and powertrain subsystems. |
Applications
| Zero-Crossing Detection | Oscillator & Timing Circuits |
|---|---|
|
Use Scenario: Detecting AC line voltage polarity transitions in power supplies or motor controllers. IC Role / Device Role / Timing Role: Voltage comparator comparing sinusoidal input against 0-V reference with hysteresis. Use Value: 165 ns response ensures accurate zero-crossing timing within 1% of 50/60 Hz cycle, minimizing EMI in TRIAC-triggered dimmers. |
Use Scenario: Generating stable square-wave clocks in relaxation oscillators or multivibrators. IC Role / Device Role / Timing Role: Core timing element in RC-feedback loop with programmable frequency via external R/C. Use Value: Strobe pin enables synchronous start/stop of oscillation; open-collector output interfaces directly with 5-V or 15-V logic families. |
| Relay & Solenoid Interface | Peak Detector & Signal Conditioning |
|
Use Scenario: Driving electromagnetic relays or solenoids in HVAC actuators or industrial valves. IC Role / Device Role / Timing Role: High-voltage level shifter and switch driver with built-in current sink capability. Use Value: 50 V / 50 mA collector output eliminates need for discrete transistor buffers, reducing BOM count and PCB area. |
Use Scenario: Capturing maximum amplitude of analog sensor signals (e.g., vibration, audio envelope). IC Role / Device Role / Timing Role: Fast comparator controlling diode-capacitor charge path in sample-and-hold topology. Use Value: Sub-200 ns response captures transients <10 µs wide; low input bias current prevents capacitor discharge error. |
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 common-mode range (–14.7 V to +13.8 V vs. –14.5 V to +13.8 V); lower max operating temp (0°C to +70°C). | Not qualified for automotive use; suitable for commercial-grade instrumentation or lab equipment only. | Select LM311DR only if ambient temperature stays below 70°C and Q-Temp qualification is unnecessary. |
| TLV3011DBVR | CMOS input (0.1 pA bias current), rail-to-rail output, but limited supply (2.7 V to 16 V) and slower response (3 µs). | Better for ultra-low-power battery sensors; unsuitable for 50-V load switching or >100 kHz timing. | Choose TLV3011DBVR only when nanoampere input leakage dominates design requirements and speed is secondary. |
Compared with LM211QD, LM311DR lacks automotive qualification and high-temp support, while TLV3011DBVR trades speed and output voltage headroom for ultra-low input current - making LM211QD the sole choice for robust, high-voltage, temperature-stable comparator applications in automotive and industrial control.
Availability
LM211QD is available at Aetrix Electronics and suitable for industrial automation, automotive body control modules, and building management systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM211QD 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 decades of expertise in high-reliability analog IC design.
The LM211 family was engineered for precision voltage comparison in harsh environments - delivering speed, supply flexibility, and output drive capability essential for automotive sensors, power conversion feedback, and industrial safety interlocks.
FAQ
What is the maximum supply voltage the LM211QD can withstand?
The LM211QD supports a total supply voltage (VCC+ – VCC–) up to 30 V, with individual rail limits of +18 V on VCC+ and –18 V on VCC–. Exceeding these absolute maximum ratings risks permanent damage. For reliable operation, TI recommends staying within 3.5 V to 30 V per the Recommended Operating Conditions table - a range that covers both ±15-V op-amp supplies and single 5-V logic rails. The LM211QD datasheet confirms this across all temperature grades.
Does the LM211QD support single-supply operation?
Yes, the LM211QD fully supports single-supply operation - for example, with VCC+ = 5 V and VCC– = 0 V (ground). Its input common-mode range extends to VCC– + 0.5 V, allowing valid comparisons near ground potential. The output remains functional with appropriate pullup resistors on COL OUT, and EMIT OUT can source current into grounded loads. This capability is explicitly validated in the LM211QD datasheet's Recommended Operating Conditions and Typical Applications sections.
How does the BAL/STRB pin function in the LM211QD?
The BAL/STRB pin on the LM211QD serves dual roles: as a strobe input (current-sink, –3 mA typical) to force output high-impedance, and as an offset balance terminal when used with the BALANCE pin. When used as strobe, it must be driven with controlled current - never shorted to ground - to avoid latch-up. As a balance terminal, it connects to one end of a potentiometer whose wiper links to BALANCE, enabling manual trimming of input offset voltage. Both functions are confirmed in the LM211QD Pin Functions table and Figure 17/18 of the datasheet.
Can multiple LM211QD outputs be connected together?
Yes, LM211QD outputs support wired-OR configuration using the open-collector COL OUT pin. Multiple devices can share a single pullup resistor to implement priority encoding, alarm aggregation, or OR logic without additional components. This behavior is explicitly stated in the LM211QD description ("outputs can be wire-OR connected") and validated in Application Note SLCS007K Figure 30. EMIT OUT may also be paralleled when loads are referenced to VCC–, but COL OUT is the standard wired-OR interface.
What is the guaranteed operating temperature range for LM211QD?
The LM211QD is rated for continuous operation from –40°C to +85°C, meeting Q-Temp automotive qualification standards. This range is distinct from the LM211 (same spec) and LM211Q (–40°C to +125°C), and is documented in Section 6.3 (Recommended Operating Conditions) and Section 8.1 (Overview) of the LM211QD datasheet. It enables deployment in engine bay sensors, powertrain control units, and industrial PLCs where ambient temperatures exceed commercial-grade limits.
LM211QD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- 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
LM211QD FAQ
1.How can I place an order for LM211QD through Aetrix?
Please submit a Request for Quotation (RFQ) for LM211QD 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 LM211QD reliable?
The price and inventory of LM211QD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM211QD is usually 5 days.
3.What payment methods are accepted for LM211QD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM211QD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM211QD?
LM211QD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM211QD 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 LM211QD?
For technical support, including LM211QD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM211QD requirements.
6.How does Aetrix verify that LM211QD is sourced from the original manufacturer or authorized distributors?
All LM211QD 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 LM211QD meets industry standards.
7.What is the process for return or replacement of LM211QD?
All LM211QD units undergo pre-shipment inspection (PSI). If there is an issue with LM211QD, 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 LM211QD part is unused and in its original packaging.
Return procedure for LM211QD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM211QD Tags
-
LM2903DR
Texas Instruments
-
LM339DR
Texas Instruments
-
LM339PWR
Texas Instruments
-
LM393DT
STMicroelectronics
-
LM2901PWR
Texas Instruments
-
LM2903DT
STMicroelectronics
-
LM393DR
Texas Instruments
-
LM239DR
Texas Instruments
-
LM339APWR
Texas Instruments
-
LM2903P
Texas Instruments
-
LM393ADR
Texas Instruments
-
NCX2200GMAZ
NXP Semiconductors
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
