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Texas Instruments LP211D
- Part No.:
- LP211D
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP211D.pdf
- Description:
- IC COMPARATOR 1 DIFF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:932
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Product details
Overview
LP211D from Texas Instruments is a low-power differential comparator with strobe and offset balancing capability, housed in an 8-pin SOIC package. It operates from ±15 V or single 3-V supply, delivers 25 mA output drive, features 1.2 μs typical response time, and is rated for −25°C to 85°C operation - ideal for battery-powered instrumentation and precision threshold detection circuits.
For engineers reviewing the LP211D datasheet, LP211D pinout, LP211D application, or LP211D equivalent, key selection considerations include its low 900 μW typical power consumption, emitter-output swing below negative rail, ±14.5 V common-mode input range, and strobe-controlled output disable functionality.
Technical Context
The LP211D implements a bipolar open-collector/open-emitter comparator architecture with independent strobe control via the BAL/STRB pin. Its input stage uses ion-implanted resistors to achieve low bias current (15 nA typ) and low offset current (2 nA typ), enabling high-impedance sensing without significant error contribution.
It supports dual- or single-supply operation with rail-to-rail common-mode input range (−14.5 V to 13.5 V at ±15 V supplies) and provides two complementary outputs: COL OUT (collector) and EMIT OUT (emitter), allowing flexible interface to TTL, CMOS, or discrete logic stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±15 V or single 3 V to 30 V - enables compatibility with legacy ±15 V systems and modern low-voltage battery rails. |
| Quiescent Power Dissipation | 900 μW typical at 5 V - extends battery life in portable sensors and remote monitoring nodes. |
| Response Time | 1.2 μs typical (100 mV step, 5 mV overdrive) - suitable for moderate-speed level detection, not high-frequency window comparators. |
| Input Offset Voltage | 7.5 mV max at 25°C - defines minimum detectable differential voltage without trimming; reduced to ≤2 mV with external balance. |
| Output Drive Capability | 25 mA sink/source - directly drives LEDs, relays, or logic inputs without external buffers. |
| Common-Mode Input Range | −14.5 V to 13.5 V at ±15 V supply - accommodates signals near supply rails, e.g., motor current sense or sensor amplifiers. |
| Operating Temperature | −25°C to +85°C - qualified for industrial environments including automotive under-hood auxiliary modules. |
Pinout & Package
LP211D is packaged in an 8-pin SOIC (D package), 3.9 mm width, 1.75 mm max height, JEDEC MS-012 variation AA compliant, RoHS-compliant NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BALANCE | Offset null adjustment terminal | Connects to external potentiometer wiper for manual input offset cancellation; improves DC accuracy in precision threshold applications. |
| 2 - IN− | Inverting input | Accepts reference or feedback signal; differential pair input node with 15 nA typical bias current. |
| 3 - IN+ | Non-inverting input | Accepts sensed signal; matched to IN− for <7.5 mV offset voltage across temperature. |
| 4 - VCC− | Negative supply rail | Reference for emitter output and internal circuitry; EMIT OUT can swing below this rail by up to 0.4 V. |
| 5 - VCC+ | Positive supply rail | Power for internal circuitry; supports single-supply operation when VCC− = GND. |
| 6 - COL OUT | Collector output | Open-collector NPN output; requires external pull-up; sinks up to 25 mA to VCC−. |
| 7 - BAL/STRB | Strobe / balance select | Pulling low disables both outputs regardless of input state; must be current-driven (100–300 μA), not shorted to ground. |
| 8 - EMIT OUT | Emitter output | Open-emitter PNP output; sources up to 25 mA from VCC+; swings below VCC− for negative-rail referenced loads. |
Key Features
| Feature | Design Value |
|---|---|
| Low-power operation | 900 μW typical at 5 V supply - reduces thermal load and enables multi-channel designs on shared power rails. |
| Strobe-enabled output disable | BAL/STRB pin forces both outputs into high-impedance state - allows synchronized sampling or power-gated comparison windows. |
| Offset balancing | External 3-kΩ potentiometer between BALANCE and BAL/STRB pins reduces input offset to ≤2 mV - critical for low-voltage sensor interfaces. |
| Dual complementary outputs | COL OUT (sink) and EMIT OUT (source) provide simultaneous active-low and active-high logic levels - eliminates need for inverters in latch or LED drive circuits. |
| Wide supply flexibility | Operates from ±15 V down to single 3 V - supports legacy industrial systems and emerging ultra-low-power IoT edge nodes. |
Applications
| Battery-Powered Threshold Detector | Industrial Overvoltage Protection |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during charging to trigger cutoff at 4.2 V. IC Role / Device Role / Timing Role: Precision comparator comparing cell voltage against stable reference; strobe used to gate comparison during charge-phase transitions. Use Value: 900 μW quiescent power extends standby time; −25°C to 85°C rating ensures reliability across environmental conditions. |
Use Scenario: Detecting AC line overvoltage (>264 VAC) in programmable logic controller (PLC) input modules. IC Role / Device Role / Timing Role: High-common-mode comparator accepting attenuated line signal; COL OUT drives optocoupler input for isolation. Use Value: ±14.5 V common-mode range accepts 200 VDC common-mode after attenuation; 25 mA output drives standard optocouplers directly. |
| Programmable Logic Interface | Temperature-Sensing Comparator |
|
Use Scenario: Converting analog sensor outputs (e.g., 0–5 V pressure transducer) into clean digital signals for FPGA GPIO. IC Role / Device Role / Timing Role: Signal conditioning comparator with external hysteresis; EMIT OUT sources current to FPGA VCCIO rail. Use Value: Dual outputs eliminate external inverter; 1.2 μs response meets FPGA setup timing for slow-control loops. |
Use Scenario: Monitoring thermistor-based temperature in HVAC control board with alarm at 70°C. IC Role / Device Role / Timing Role: Differential comparator comparing thermistor divider against precision reference; BALANCE pin trimmed for 70°C trip point. Use Value: 7.5 mV max offset ensures ≤0.5°C error at room temperature; −25°C to 85°C rating covers full system operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-power differential comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP311D | Same pinout and electrical specs, but rated 0°C to 70°C only; 7.5 mV VIO max at 25°C identical. | Not qualified for extended industrial temperature range; unsuitable for outdoor or under-hood use. | Select LP311D only for commercial-grade cost-sensitive applications where ambient stays within 0–70°C. |
| LM211DR | Higher power (3.6 mW vs 0.9 mW), faster response (130 ns vs 1.2 μs), wider temp range (−25°C to 85°C), same SOIC-8 pinout. | Used where speed outweighs power savings; lacks integrated strobe and offset balancing pins. | Choose LM211DR when sub-microsecond response is required; accept higher supply current and omit strobe/balance functions. |
Compared with LP311D, LP211D adds extended temperature support without sacrificing power or pin compatibility; versus LM211DR, it trades speed for 4× lower power and adds strobe/offset features - making LP211D optimal for energy-constrained, temperature-variable, and functionally gated comparator roles.
Availability
LP211D is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial overvoltage protection, and programmable logic interface applications requiring stable component supply across extended temperature ranges.
Supply support for LP211D 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 broad design support.
The LP211D belongs to TI's legacy precision analog comparator family, designed specifically for low-power, wide-supply, and functionally enhanced replacements of industry-standard LM211/LM311 devices in industrial and portable systems.
FAQ
What is the maximum supply voltage for LP211D?
The LP211D supports absolute maximum supply voltages of ±18 V across VCC+ and VCC− terminals. In recommended operation, the total supply voltage (VCC+ − VCC−) ranges from 3.5 V to 30 V. Exceeding ±18 V risks permanent damage per the absolute maximum ratings table in the SLCS003D datasheet.
Does LP211D support single-supply operation?
Yes, LP211D supports true single-supply operation down to 3 V. When configured with VCC− tied to ground, the device maintains full functionality including common-mode input range from 0.5 V to VCC+ − 1.5 V, emitter output swing below ground, and 25 mA output drive - confirmed in the recommended operating conditions section of the LP211D datasheet.
How is the strobe function implemented on LP211D?
The strobe function on LP211D is controlled via Pin 7 (BAL/STRB). Pulling this pin low with 100–300 μA current disables both COL OUT and EMIT OUT regardless of input states. The datasheet explicitly warns against shorting BAL/STRB to ground; instead, it must be actively current-driven using a transistor or logic buffer to ensure reliable output disable behavior in the LP211D.
Can LP211D replace LM211 in existing designs?
Yes, LP211D is designed to be interchangeable with LM211 and shares identical pinout, output structure, and functional block diagram. However, LP211D draws 30× less supply current (900 μW vs ~3.6 mW) and responds 6× slower (1.2 μs vs 130 ns). Verify timing margins and power budget before drop-in replacement in the LP211D.
What is the purpose of the BALANCE pin on LP211D?
The BALANCE pin (Pin 1) on LP211D enables external offset voltage trimming using a 3-kΩ potentiometer connected between BALANCE and BAL/STRB pins. This reduces input offset voltage from 7.5 mV max to ≤2 mV, improving DC accuracy in precision applications such as sensor threshold detection - a capability not present in standard LM211 or LM311 devices.
LP211D 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
- :
- 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
LP211D FAQ
1.How can I place an order for LP211D through Aetrix?
Please submit a Request for Quotation (RFQ) for LP211D 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 LP211D reliable?
The price and inventory of LP211D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP211D is usually 5 days.
3.What payment methods are accepted for LP211D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP211D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP211D?
LP211D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP211D 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 LP211D?
For technical support, including LP211D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP211D requirements.
6.How does Aetrix verify that LP211D is sourced from the original manufacturer or authorized distributors?
All LP211D 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 LP211D meets industry standards.
7.What is the process for return or replacement of LP211D?
All LP211D units undergo pre-shipment inspection (PSI). If there is an issue with LP211D, 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 LP211D part is unused and in its original packaging.
Return procedure for LP211D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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