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Texas Instruments LM211QDREP
- Part No.:
- LM211QDREP
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM211QDREP.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,438
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Product details
Overview
LM211QDREP from Texas Instruments is a single high-speed differential voltage comparator with strobe and offset balance capability, designed for operation from ±15 V or single 5-V supplies. It features 3 mV max input offset voltage at 25°C, 300 nA max input bias current, and 115 ns low-to-high response time. It drives TTL/MOS loads and switches up to 50 V at 50 mA in industrial control and power monitoring systems.
For engineers reviewing the LM211QDREP datasheet, LM211QDREP pinout, LM211QDREP application, or LM211QDREP equivalent, key selection considerations include its dual-supply compatibility, strobe-controlled output disable, emitter/collector open-collector outputs, and extended temperature range (–40°C to 125°C) for harsh-environment signal conditioning.
Technical Context
The LM211QDREP implements a bipolar transistor-based differential pair front-end with active load and wired-OR capable open-collector/open-emitter outputs. Its internal architecture supports independent referencing of inputs and outputs to ground, VCC+, or VCC–, enabling floating-sense applications.
Strobe functionality is implemented via a dedicated BAL/STRB terminal that forces the output into high-impedance off-state when pulled low (–3 mA), regardless of input differential voltage. Offset trimming is supported through an external BALANCE pin connected to a potentiometer between VCC+ and VCC–.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | Max 3 mV at 25°C - sets minimum detectable differential input for precision threshold detection |
| Input Bias Current | Max 300 nA - enables high-impedance sensor interfacing without significant loading error |
| Response Time | 115 ns (L→H), 165 ns (H→L) - supports >5 MHz signal edge detection in timing-critical circuits |
| Supply Voltage Range | 3.5 V to 30 V total (VCC+ – VCC–) - operates from single 5-V logic rails or dual ±15-V op-amp supplies |
| Output Drive Capability | 50 V @ 50 mA - directly switches relays, lamps, or MOSFET gates without external buffers |
| Operating Temperature | –40°C to 125°C - qualified for automotive engine control, industrial PLCs, and avionics subsystems |
| Strobe Input Current | –3 mA typical at 0.3 V - defines required drive strength for reliable output disable under noise-immune conditions |
Pinout & Package
LM211QDREP is housed in an 8-pin SOIC (D package), 3.9 mm × 4.9 mm body, 1.75 mm max height, with standard JEDEC MS-012 variation AA footprint and RoHS-compliant NiPdAu lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BAL/STRB | Strobe control / balance adjust | Low-active strobe input; when grounded or driven ≤0.3 V, forces output OFF; also used with external pot for offset nulling |
| 2 - IN− | Inverting input | Differential input node referenced to system ground or floating supply rail; accepts ±15 V common-mode range |
| 3 - IN+ | Non-inverting input | Differential input node with same voltage range as IN−; used for threshold comparison or zero-crossing detection |
| 4 - VCC− | Negative supply rail | Reference for internal circuitry and emitter output; supports negative supply down to –18 V absolute maximum |
| 5 - VCC+ | Positive supply rail | Primary power connection; supports up to +18 V; supplies collector output stage and internal bias networks |
| 6 - COL OUT | Collector open-collector output | Active-low output referenced to VCC+; requires external pull-up to define logic high level and sink current up to 50 mA |
| 7 - BALANCE | Offset null adjustment | Connects to center tap of external 10-kΩ pot between VCC+ and VCC– to trim input offset voltage to <1 mV |
| 8 - EMIT OUT | Emitter open-emitter output | Active-high output referenced to VCC−; sinks current to ground or negative rail; enables level-shifting and wired-OR configurations |
Key Features
| Feature | Design Value |
|---|---|
| Strobe-enabled output disable | Guarantees output remains OFF during system initialization or fault conditions, preventing spurious actuation |
| Independent input/output referencing | Allows IN+/IN− and COL OUT/EMIT OUT to operate with respect to different supply rails or ground domains |
| Wired-OR output capability | Enables multiple LM211QDREP comparators to share a single pull-up resistor for priority encoding or alarm aggregation |
| Extended temperature qualification | Qualified per JEDEC standards including HAST, temperature cycling, and electromigration testing for life-critical reliability |
| High-voltage output switching | Drives 50 V loads directly-eliminates need for external driver transistors in relay, solenoid, or lamp control |
Applications
| Motor Overcurrent Protection | Zero-Crossing Detection |
|---|---|
Use Scenario: Monitoring motor phase current via shunt resistor to trigger shutdown before thermal damage occurs. IC Role / Device Role / Timing Role: High-speed comparator compares sensed voltage against programmable threshold; strobe disables output during PWM dead-time to prevent false trips. Use Value: 115 ns response ensures detection within first 200 ns of overcurrent event; 50 V output drives IGBT gate driver enable line directly. | Use Scenario: Detecting AC line voltage polarity transitions for synchronized switching in TRIAC dimmers or inverters. IC Role / Device Role / Timing Role: Differential input rejects common-mode noise on AC mains; balanced inputs eliminate DC offset drift over temperature. Use Value: 3 mV max VIO ensures accurate crossing point detection across –40°C to 125°C; dual-supply operation matches AC coupling requirements. |
| Industrial Relay Driver | Photodiode Signal Thresholding |
Use Scenario: Driving 24 VDC industrial relays in PLC I/O modules where isolation and long cable runs introduce noise. IC Role / Device Role / Timing Role: Comparator interfaces with opto-isolated feedback; EMIT OUT connects to relay coil return path for ground-referenced switching. Use Value: Open-emitter output sinks 50 mA at <0.4 V saturation, minimizing relay coil power loss; strobe synchronizes activation with controller scan cycle. | Use Scenario: Converting weak photodiode current (nA–µA) into digital pulses for optical encoder or smoke detector systems. IC Role / Device Role / Timing Role: Transimpedance amplifier output feeds IN+; IN− tied to precision reference; BAL/STRB disables output during dark calibration intervals. Use Value: 300 nA max input bias current prevents signal corruption from photodiode leakage; strobe reduces input current to 50 pA when disabled. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM211MDREP | Same silicon, –55°C to 125°C operating range, M-temp grade qualification | Required for aerospace or extended cold-start automotive applications below –40°C | Select LM211MDREP when full military-grade temperature coverage is mandatory |
| LM211DR | Commercial-grade (0°C to 70°C), non-EP construction, no enhanced DMS support | Suitable only for benign environments; lacks Q- or M-temp qualification testing | Choose LM211DR only for cost-sensitive, non-critical consumer applications with controlled ambient |
Compared with LM211QDREP, LM211MDREP extends low-temperature operation to –55°C with identical electrical specs and pinout, while LM211DR omits extended temp qualification, radiation hardening, and DMS support-making it unsuitable for industrial or automotive deployment.
Availability
LM211QDREP is available at Aetrix Electronics and suitable for motor protection, zero-crossing detection, relay driving, and photodiode thresholding requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM211QDREP 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, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and industrial-grade performance.
The LM211-EP product line delivers radiation-tolerant, extended-temperature comparators for mission-critical systems in defense, space, and transportation infrastructure where supply chain continuity and long-term qualification are mandatory.
FAQ
What is the maximum supply voltage rating for LM211QDREP?
The LM211QDREP has an absolute maximum supply voltage rating of ±18 V (VCC+ ≤ +18 V, VCC− ≥ –18 V), with a maximum total supply range (VCC+ – VCC−) of 36 V. Recommended operating range is 3.5 V to 30 V. Exceeding these limits risks permanent device damage, as confirmed in the Absolute Maximum Ratings table of the SLCS140A datasheet. LM211QDREP must never be operated beyond these boundaries in any design.
Does LM211QDREP support single-supply operation?
Yes, LM211QDREP supports true single-supply operation from as low as 3.5 V total supply (e.g., VCC+ = 5 V, VCC− = 0 V). Its input common-mode range extends to VCC− + 0.5 V and VCC+ – 1.5 V, and outputs remain functional with emitter tied to ground. This enables direct interface with 5-V microcontrollers and logic systems without level-shifting. The LM211QDREP datasheet explicitly confirms single 5-V operation in both Features and Recommended Operating Conditions sections.
How does the BAL/STRB pin function in LM211QDREP?
The BAL/STRB pin on LM211QDREP serves dual roles: as a strobe input (active-low) to force output disable, and as an offset balance terminal when used with an external potentiometer. When driven to ≤0.3 V with –3 mA current, it overrides all input conditions and places both COL OUT and EMIT OUT in high-impedance states. As a balance terminal, it connects to the wiper of a 10-kΩ pot between VCC+ and VCC– to null input offset voltage. Both functions are validated in the Functional Block Diagram and Figure 13 of the LM211QDREP datasheet.
Can LM211QDREP outputs be wired-OR connected?
Yes, LM211QDREP's COL OUT (open-collector) and EMIT OUT (open-emitter) outputs support wired-OR configurations. Multiple LM211QDREP devices can share a single pull-up resistor on COL OUT lines or a single pull-down on EMIT OUT lines to implement priority encoders, alarm aggregation, or OR logic without additional gates. This capability is explicitly stated in the Description section and verified in Application Figure 29 of the LM211QDREP datasheet.
What is the input bias current specification for LM211QDREP?
The LM211QDREP has a maximum input bias current of 300 nA at 25°C and 150 nA across the full –40°C to 125°C operating range. This value is measured with VO = 1 V to 14 V and is specified in the Electrical Characteristics table of the SLCS140A datasheet. Low input bias current enables high-impedance sensor interfacing-such as photodiodes or precision voltage dividers-without introducing measurable error due to loading.
LM211QDREP 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
LM211QDREP FAQ
1.How can I place an order for LM211QDREP through Aetrix?
Please submit a Request for Quotation (RFQ) for LM211QDREP 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 LM211QDREP reliable?
The price and inventory of LM211QDREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM211QDREP is usually 5 days.
3.What payment methods are accepted for LM211QDREP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM211QDREP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM211QDREP?
LM211QDREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM211QDREP 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 LM211QDREP?
For technical support, including LM211QDREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM211QDREP requirements.
6.How does Aetrix verify that LM211QDREP is sourced from the original manufacturer or authorized distributors?
All LM211QDREP 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 LM211QDREP meets industry standards.
7.What is the process for return or replacement of LM211QDREP?
All LM211QDREP units undergo pre-shipment inspection (PSI). If there is an issue with LM211QDREP, 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 LM211QDREP part is unused and in its original packaging.
Return procedure for LM211QDREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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