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Texas Instruments LP211DRG4
- Part No.:
- LP211DRG4
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP211DRG4.pdf
- Description:
- IC COMPARATOR 1 DIFF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,272
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Product details
Overview
LP211DRG4 from Texas Instruments is a low-power differential comparator with strobe and offset balancing capability 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 industrial threshold-detection circuits.
For engineers reviewing the LP211DRG4 datasheet, LP211DRG4 pinout, LP211DRG4 application, or LP211DRG4 equivalent, key selection considerations include its 7.5 mV max input offset voltage at 25°C, emitter-collector open-collector outputs, strobe-controlled output disable, and compatibility with LM211/LM311 PCB layouts.
Technical Context
The LP211DRG4 implements a bipolar comparator core with dual open-collector outputs (emitter and collector), enabling flexible interfacing with TTL, CMOS, or relay drivers. Its strobe input (Pin 7) disables output regardless of input states when pulled low with 100–300 μA current, not direct grounding.
Offset balancing is supported via external resistors on Pin 5 (BALANCE) and Pin 7 (BAL/STRB), allowing trimming of input offset voltage down to ≤2 mV typ. The device uses ion-implanted resistors to achieve 900 μW typical power consumption at 5 V - a 30:1 reduction versus LM311 - without sacrificing wide common-mode range (−14.5 V to 13.5 V at ±15 V supply).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | ±15 V or single 3 V to 30 V total - supports rail-to-rail input swing and battery-backed systems. |
| Input Offset Voltage | 7.5 mV max at 25°C - sets minimum detectable differential voltage before output switching. |
| Response Time | 1.2 μs typ (100-mV step, 5-mV overdrive) - suitable for medium-speed level detection, not high-frequency windowing. |
| Output Drive | 25 mA sink capability at collector output - directly drives LEDs, small relays, or logic inputs without buffering. |
| Quiescent Current | 300 μA max total supply current - enables multi-year operation in coin-cell-powered sensors. |
| Common-Mode Range | −14.5 V to 13.5 V at ±15 V supply - accommodates signals near negative rail, e.g., current-sense amplifiers. |
| Strobe Input Current | 100–300 μA low-level drive requirement - mandates active current source, not passive pull-down. |
Pinout & Package
LP211DRG4 is housed in an 8-pin SOIC (D) package per JEDEC MS-012 variation AA, 3.91 mm body width, 1.75 mm max height, with gull-wing leads and Q1 pin-1 quadrant orientation in tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EMIT OUT | Emitter output terminal | Open-emitter output; sinks current when active; swings below VCC−, enabling negative-rail referenced loads. |
| 2 - IN+ | Non-inverting input | Differential input node; accepts signals up to ±15 V; high-impedance (15 nA bias current typ). |
| 3 - IN− | Inverting input | Differential input node; used with IN+ for threshold comparison; same bias and offset specs as IN+. |
| 4 - VCC− | Negative supply rail | Reference for emitter output and internal circuitry; supports operation down to −18 V absolute max. |
| 5 - VCC+ | Positive supply rail | Reference for collector output and internal circuitry; supports operation up to +18 V absolute max. |
| 6 - COL OUT | Collector output terminal | Open-collector output; sinks up to 25 mA; requires external pull-up for logic-high state. |
| 7 - BAL/STRB | Balancing/strobe dual-function pin | When used for offset trim: connects to external potentiometer. When used for strobe: sinking 100–300 μA disables both outputs. |
| 8 - BALANCE | Offset balance terminal | Connects to opposite end of trim potentiometer; enables adjustment of input offset voltage to ≤2 mV typ. |
Key Features
| Feature | Design Value |
|---|---|
| Low-power operation | 900 μW typical at 5 V - extends battery life in portable data loggers and remote sensors. |
| Strobe-enabled output disable | Pin 7 sinking 100–300 μA forces both outputs into high-impedance state - enables time-gated sampling without external switches. |
| Wide supply flexibility | Operates from ±15 V or single 3-V supply - simplifies design across industrial, automotive, and consumer power domains. |
| Offset voltage trimming | External 3-kΩ potentiometer between Pins 5 and 7 adjusts input offset to ≤2 mV typ - improves precision in analog thresholding. |
| Robust output stage | 25 mA sink capability on COL OUT and sub-rail swing on EMIT OUT - drives diverse loads including optocouplers and small solenoids. |
Applications
| Battery-Powered Threshold Detector | Industrial Level-Sensing Interface |
|---|---|
|
Use Scenario: Monitoring battery voltage in a handheld medical device to trigger low-battery warning at 3.2 V. IC Role / Device Role / Timing Role: Differential comparator comparing battery voltage against precision reference; strobe synchronized to ADC sampling window. Use Value: 900 μW quiescent power extends operational runtime; strobe prevents false triggers during measurement transients. |
Use Scenario: Detecting fluid level in a chemical tank using a resistive sensor network with ±12 V supply. IC Role / Device Role / Timing Role: High-common-mode comparator rejecting ground noise while sensing 0–10 V sensor output. Use Value: −14.5 V to 13.5 V common-mode range rejects 10 V of ground offset; 25 mA output drives PLC input directly. |
| Programmable Logic Controller Input Module | Legacy System Upgrade Interface |
|
Use Scenario: Converting 4–20 mA current-loop signals to digital logic levels in an industrial I/O module. IC Role / Device Role / Timing Role: Comparator with external shunt resistor and reference; strobe used for synchronized polling by microcontroller. Use Value: Dual open-collector outputs interface cleanly with 3.3 V or 5 V logic; 1.2 μs response meets PLC scan-time requirements. |
Use Scenario: Replacing obsolete LM211 in legacy test equipment requiring identical footprint and function. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement with lower power and same strobe/balance functionality. Use Value: Same SOIC-8 pinout and electrical behavior enables zero-layout-change upgrade; 30× lower power reduces thermal load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM211DR | Higher 6.5 mW typical power; faster 200 ns response; no guaranteed −25°C low-temp rating. | Preferred where speed >1 MHz is required; unsuitable for extended low-temperature battery operation. | Select LM211DR only if response time <500 ns is mandatory and power budget allows. |
| LP311DR | Identical electrical specs but rated 0°C to 70°C; same SOIC-8 package and pinout. | Suitable for commercial-grade applications; not qualified for extended industrial temperature range. | Choose LP311DR for cost-sensitive, room-temperature designs where −25°C operation is unnecessary. |
Compared with LM211DR, LP211DRG4 trades 30× lower power and extended temperature range for 6× slower response; compared with LP311DR, it adds −25°C capability without electrical or layout changes - making it the optimal choice for ruggedized, energy-constrained systems.
Availability
LP211DRG4 is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial sensor interfaces, programmable logic controller input modules, and legacy system upgrades requiring stable component supply and long-term obsolescence management.
Supply support for LP211DRG4 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.
The LP211DRG4 belongs to TI's legacy precision analog comparator family, designed specifically for low-power, wide-supply, and temperature-robust threshold detection in resource-constrained embedded systems.
FAQ
What is the operating temperature range of the LP211DRG4?
The LP211DRG4 is characterized for operation from −25°C to 85°C. This extended industrial temperature range makes it suitable for deployment in outdoor sensors, automotive under-hood modules, and factory-floor equipment where ambient conditions exceed commercial-grade limits. The LP211DRG4 maintains specified input offset voltage, response time, and output drive performance across this full range.
Can the LP211DRG4 be used with a single 3.3-V supply?
Yes, the LP211DRG4 operates from a single supply as low as 3 V, so it functions reliably with standard 3.3-V rails. At 3.3 V, its output drive remains functional (≥1.6 mA sink), input common-mode range shifts to approximately −0.5 V to 2.3 V, and quiescent current stays below 300 μA - enabling direct integration into modern low-voltage microcontroller systems without level-shifting.
How does the strobe function work on the LP211DRG4?
The strobe function is implemented on Pin 7 (BAL/STRB): pulling this pin low with 100–300 μA current - not direct grounding - forces both EMIT OUT and COL OUT into high-impedance states, regardless of input conditions. This enables precise timing control for gated measurements or synchronized shutdown. Direct shorting to ground is prohibited and may damage the internal structure.
Is the LP211DRG4 pin-compatible with the LM211?
Yes, the LP211DRG4 shares identical pinout, footprint, and terminal functions with the LM211 and LM311. All eight pins - including EMIT OUT, COL OUT, IN+, IN−, VCC+, VCC−, BAL/STRB, and BALANCE - map one-to-one. This allows direct PCB replacement in existing LM211 designs, delivering immediate power savings and extended temperature capability without layout modification.
What is the maximum input differential voltage the LP211DRG4 can tolerate?
The LP211DRG4 supports a maximum differential input voltage (VID) of ±30 V, as specified in its absolute maximum ratings. This robustness allows safe operation with large-signal transients, such as those encountered in motor control feedback paths or industrial signal conditioning stages where input spikes may exceed rail voltages. Exceeding ±30 V risks permanent device damage.
LP211DRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
LP211DRG4 FAQ
1.How can I place an order for LP211DRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP211DRG4 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 LP211DRG4 reliable?
The price and inventory of LP211DRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP211DRG4 is usually 5 days.
3.What payment methods are accepted for LP211DRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP211DRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP211DRG4?
LP211DRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP211DRG4 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 LP211DRG4?
For technical support, including LP211DRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP211DRG4 requirements.
6.How does Aetrix verify that LP211DRG4 is sourced from the original manufacturer or authorized distributors?
All LP211DRG4 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 LP211DRG4 meets industry standards.
7.What is the process for return or replacement of LP211DRG4?
All LP211DRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LP211DRG4, 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 LP211DRG4 part is unused and in its original packaging.
Return procedure for LP211DRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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