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Texas Instruments LP211DR
- Part No.:
- LP211DR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP211DR.pdf
- Description:
- IC COMPARATOR 1 DIFF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,657
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Product details
Overview
LP211DR from Texas Instruments is a low-power differential comparator with strobe and offset balancing capability, designed for precision threshold detection in battery-powered and industrial systems. It features 900 μW typical power consumption at 5 V, 1.2 μs typical response time, ±15 V or single 3 V supply operation, and emitter-collector open-drain outputs capable of 25 mA sink current.
For engineers reviewing the LP211DR datasheet, LP211DR pinout, LP211DR application, or LP211DR equivalent, this device is selected for low-quiescent-current analog sensing, voltage monitoring in portable instrumentation, and strobed signal conditioning where thermal stability and wide common-mode range (−14.5 V to 13.5 V) are critical.
Technical Context
The LP211DR implements a bipolar input stage with ion-implanted resistors enabling stable offset performance and 30:1 power reduction versus LM311. Its dual-output architecture (emitter and collector) supports flexible interfacing-emitter output swings below VCC−, while collector output handles higher voltage loads up to 40 V relative to VCC−.
Strobe functionality is implemented via a current-sinking BAL/STRB pin requiring 100–300 μA drive to disable output regardless of input state; offset balancing uses external resistors on the BALANCE and BAL/STRB pins. The device operates across −25°C to 85°C and maintains 7.5 mV max input offset voltage at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±15 V or single 3 V to 30 V total-supports rail-to-rail input common-mode range and direct interface with microcontroller I/O or logic families. |
| Quiescent Power | 900 μW typical at 5 V-enables multi-year battery life in remote sensors and portable test equipment. |
| Response Time | 1.2 μs typical (100 mV step, 5 mV overdrive)-sufficient for slow-varying signals like temperature, pressure, or battery voltage thresholds. |
| Input Offset Voltage | 7.5 mV max at 25°C-defines worst-case decision error in precision level-shifting or window-detection circuits. |
| Output Drive | 25 mA sink capability at emitter output-directly drives LEDs, relays, or logic inputs without external buffers. |
| Input Bias Current | 15 nA typical-minimizes loading error on high-impedance sources such as thermistors or photodiodes. |
| Common-Mode Range | −14.5 V to 13.5 V with ±15 V supply-allows direct sensing of signals referenced to negative rails or floating grounds. |
Pinout & Package
LP211DR is housed in an 8-pin SOIC (D) package per JEDEC MS-012 variation AA, 3.9 mm width, 1.75 mm max height, with gull-wing leads and Q1 pin-1 orientation in tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BALANCE | Offset null adjustment | Connects to external potentiometer wiper for trimming input offset voltage to ≤2 mV. |
| 2 - IN− | Inverting input | Differential input node; accepts signals within −14.5 V to 13.5 V common-mode range. |
| 3 - IN+ | Non-inverting input | Differential input node; used for reference or signal comparison with matched bias current. |
| 4 - VCC− | Negative supply rail | Reference for emitter output swing; enables output to go below ground when needed. |
| 5 - VCC+ | Positive supply rail | Supports single-supply (3–30 V) or split-supply (±15 V) operation; powers internal circuitry. |
| 6 - COL OUT | Collector output | Open-collector output capable of sinking 25 mA; requires external pull-up to VCC+ or other rail. |
| 7 - BAL/STRB | Strobe & balance control | Current-sink input (100–300 μA) to force output off; also serves as second offset trim terminal. |
| 8 - EMIT OUT | Emitter output | Open-emitter output that can swing below VCC− by up to 30 V-ideal for level-shifting to negative rails. |
Key Features
| Feature | Design Value |
|---|---|
| Low-power operation | 900 μW typical at 5 V supply-reduces thermal load and extends battery runtime in portable designs. |
| Strobe-enabled output disable | Active-low current-driven strobe (100–300 μA) allows synchronized blanking of comparator decisions in multiplexed systems. |
| Dual-output topology | Separate emitter and collector outputs provide design flexibility: EMIT OUT sinks below VCC−; COL OUT interfaces with positive logic rails. |
| Wide supply range | Operates from single 3 V up to ±15 V-eliminates need for dedicated voltage regulators in mixed-supply systems. |
| Offset balancing | Two-terminal nulling (BALANCE + BAL/STRB) enables <2 mV residual offset-critical for high-accuracy threshold detection. |
Applications
| Battery Voltage Monitor | Industrial Threshold Detector |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during charging/discharging to trigger cutoff or alert at 2.8 V and 4.2 V thresholds. IC Role / Device Role / Timing Role: Differential comparator comparing cell voltage against precision references; strobe disables monitoring during charge pulses. Use Value: 900 μW quiescent power extends system standby time; wide common-mode range accommodates direct cell connection without level shifters. |
Use Scenario: Detecting overtemperature in motor windings using a PT100 sensor and Wheatstone bridge. IC Role / Device Role / Timing Role: Precision comparator converting bridge imbalance into digital alarm signal; offset balancing compensates for sensor lead resistance. Use Value: 7.5 mV max offset ensures ≤0.3°C measurement error at 100 Ω/°C; −25°C to 85°C rating matches industrial ambient requirements. |
| Programmable Logic Interface | Power Supply Sequencing |
|
Use Scenario: Converting analog control voltages (0–5 V) into clean TTL-compatible enable signals for FPGA configuration. IC Role / Device Role / Timing Role: Single-supply comparator with COL OUT pulled to 3.3 V; strobe synchronizes with system reset pulse. Use Value: 25 mA sink current drives FPGA I/O directly; 1.2 μs response avoids timing jitter in configuration handshaking. |
Use Scenario: Ensuring correct power-up order of +12 V, +5 V, and +3.3 V rails in embedded computing modules. IC Role / Device Role / Timing Role: Multi-rail monitor using separate LP211DR units per rail; BAL/STRB pins daisy-chained for cascaded enable sequencing. Use Value: Dual outputs allow independent control of upstream/downstream enable lines; ±15 V tolerance supports direct sensing of unregulated supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM311DR | Higher 6.5 mW typical power, faster 115 ns response, wider −15.5 V to 14.5 V common-mode range, no strobe pin. | Preferred for high-speed zero-crossing detection but unsuitable for ultra-low-power battery systems. | Select LM311DR only when speed >10× LP211DR is required and power budget allows ≥7× increase. |
| LP311DR | Identical electrical specs and pinout, but rated for 0°C to 70°C instead of −25°C to 85°C; same 7.5 mV offset and 900 μW power. | Suitable for commercial-grade consumer electronics but not extended-temperature industrial deployments. | Choose LP311DR for cost-sensitive, room-temperature applications where extended temp range is unnecessary. |
Compared with LM311DR, LP211DR trades speed for 30× lower power and adds strobe control; compared with LP311DR, it offers identical functionality with extended temperature qualification-making it the sole choice for battery-powered industrial sensors requiring −25°C startup.
Availability
LP211DR is available at Aetrix Electronics and suitable for battery voltage monitoring, industrial threshold detection, programmable logic interfacing, power supply sequencing, and analog signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for LP211DR 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 specializing in analog and embedded processing technologies, with leadership in precision analog ICs and industrial-grade components.
The LP211DR belongs to TI's legacy low-power comparator family, engineered for energy-constrained applications where accuracy, temperature robustness, and functional integration (strobe + offset trim) outweigh raw speed requirements.
FAQ
What is the operating temperature range for LP211DR?
The LP211DR is characterized for operation from −25°C to 85°C, making it suitable for industrial environments where extended thermal performance is required. This range is confirmed in TI's SLCS003D datasheet and distinguishes LP211DR from the LP311DR (0°C to 70°C). The LP211DR maintains specified electrical parameters-including 7.5 mV max input offset voltage and 900 μW typical power-across this full range.
Does LP211DR support single-supply operation?
Yes, LP211DR operates from a single supply as low as 3 V up to 30 V total (VCC+ to VCC−), with full functionality including strobe, offset balancing, and 25 mA output drive. Its input common-mode range extends to VCC− + 0.5 V and VCC+ − 1.5 V, enabling direct interface with sensors or references referenced to ground in single-supply systems. This capability is explicitly verified in the recommended operating conditions table of the SLCS003D datasheet.
How is the strobe function implemented on LP211DR?
The strobe function on LP211DR is implemented via the BAL/STRB pin (Pin 7), which must be driven with 100–300 μA of sink current to disable the output regardless of input states. Pulling this pin low does not mean grounding it directly-TI specifies current-driven activation to avoid unintended turn-off. When active, the strobe forces both EMIT OUT and COL OUT into high-impedance states. This behavior is documented in the electrical characteristics table under "Low-level strobe current" and Figure 2 of the SLCS003D datasheet.
Can LP211DR replace LM311 in existing designs?
LP211DR shares identical pinout and core functionality with LM311, enabling drop-in replacement in many cases-but with critical trade-offs: LP211DR consumes 30× less power (900 μW vs. ~6.5 mW) yet has 6× slower response (1.2 μs vs. 115 ns). It also adds strobe capability and requires different offset nulling (two-terminal vs. LM311's single-potentiometer method). Therefore, LP211DR is a functional replacement only where speed is non-critical and strobe or ultra-low power is beneficial.
What package type and reel specifications apply to LP211DR?
LP211DR is supplied in an 8-pin SOIC (D) package per JEDEC MS-012 AA, with 2500 units per large tape-and-reel. Reel dimensions are 330 mm diameter × 12.4 mm width, and pin-1 orientation follows quadrant Q1 per TI's tape-and-reel specification. The package has 1.75 mm max height, gull-wing leads, and RoHS-compliant NiPdAu (NIPDAU) finish with MSL Level-1 rating. These details are confirmed in TI's PACKAGE OPTION ADDENDUM and TAPE AND REEL INFORMATION documents.
LP211DR 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:
- Differential
- Number of Elements:
- 1
- Output Type:
- Open-Collector, Open-Emitter
- Voltage - Supply, Single/Dual (±):
- 3.5V ~ 30V, ±1.75V ~ 15V
- :
- 7.5mV @ ±15V
- Voltage - Input Offset (Max):
- 0.1µA @ ±15V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 300µA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -25°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
LP211DR FAQ
1.How can I place an order for LP211DR through Aetrix?
Please submit a Request for Quotation (RFQ) for LP211DR 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 LP211DR reliable?
The price and inventory of LP211DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP211DR is usually 5 days.
3.What payment methods are accepted for LP211DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP211DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP211DR?
LP211DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP211DR 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 LP211DR?
For technical support, including LP211DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP211DR requirements.
6.How does Aetrix verify that LP211DR is sourced from the original manufacturer or authorized distributors?
All LP211DR 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 LP211DR meets industry standards.
7.What is the process for return or replacement of LP211DR?
All LP211DR units undergo pre-shipment inspection (PSI). If there is an issue with LP211DR, 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 LP211DR part is unused and in its original packaging.
Return procedure for LP211DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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