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Texas Instruments LP211DRE4
- Part No.:
- LP211DRE4
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP211DRE4.pdf
- Description:
- IC COMPARATOR 1 DIFF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,224
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Product details
Overview
LP211DRE4 from Texas Instruments is a low-power differential comparator with strobe capability in an 8-pin SOIC package, featuring 7.5 mV max input offset voltage at 25°C, 1.2 μs typical response time, and dual-supply (±15 V) or single-supply (as low as 3 V) operation - used in battery-powered voltage monitoring and precision threshold detection circuits.
For engineers reviewing the LP211DRE4 datasheet, LP211DRE4 pinout, LP211DRE4 application, or LP211DRE4 equivalent, key selection considerations include its −25°C to 85°C operating temperature range, emitter-collector open-drain outputs capable of 25 mA sink current, strobe-controlled output disable, and compatibility with LM211/LM311 PCB layouts.
Technical Context
The LP211DRE4 implements a bipolar comparator core with ion-implanted resistor networks enabling ultra-low quiescent power (900 μW typical at 5 V), while retaining wide common-mode input range (−14.5 V to 13.5 V with ±15-V supply) and internal balance/strobe control circuitry. Its open-emitter and open-collector outputs support wired-OR logic and level-shifting across supply domains.
Strobe functionality operates by sinking 100–300 μA from the BAL/STRB pin to force output disable independent of input states; offset balancing uses external resistors between BALANCE and BAL/STRB pins. The device avoids oscillation with standard layout practices due to stable internal compensation and low input bias currents (15 nA typ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | Single supply: 3 V to 30 V; dual supply: ±15 V - supports direct integration into 3.3 V, 5 V, and industrial ±12 V systems without level shifters. |
| Input Offset Voltage | 7.5 mV max at 25°C - defines worst-case threshold error in precision window or zero-crossing detection applications. |
| Response Time | 1.2 μs typical (100-mV step, 5-mV overdrive) - suitable for moderate-speed signal conditioning, not high-frequency PWM or data slicing. |
| Output Drive | 25 mA sink capability at emitter and collector outputs - enables direct driving of LEDs, relays, or TTL inputs without external buffers. |
| Quiescent Power | 900 μW typical at 5 V - enables multi-year operation on coin-cell batteries in portable sensor nodes and IoT wake-up circuits. |
| Operating Temperature | −25°C to +85°C - qualified for extended industrial environments including automotive under-hood auxiliary modules and outdoor metering. |
| Input Bias Current | 15 nA typical - minimizes voltage error across high-impedance sensor bridges or RC timing networks. |
Pinout & Package
LP211DRE4 is housed in an 8-pin SOIC (D) package, 3.9 mm width, 1.75 mm max height, RoHS-compliant NIPDAU lead finish, MSL Level-1 (260°C peak reflow), tape-and-reel packaging (2500 units/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EMIT OUT | Emitter output terminal | Open-emitter output referenced to VCC−; sinks current when active; can swing below VCC− rail for negative-voltage interface. |
| 2 - IN+ | Non-inverting input | Differential input node with 15 nA bias current; accepts common-mode voltages down to VCC− + 0.5 V. |
| 3 - IN− | Inverting input | Differential input node; paired with IN+ for threshold comparison; supports strobe-synchronized decision hold. |
| 4 - VCC− | Negative supply rail | Reference for emitter output and internal circuitry; required even in single-supply configurations (tied to GND). |
| 5 - VCC+ | Positive supply rail | Primary power input; supports up to +18 V or single 3–30 V operation; supplies internal bias and output stages. |
| 6 - COL OUT | Collector output terminal | Open-collector output referenced to VCC+; sinks current when active; compatible with 5 V or 3.3 V logic pull-ups. |
| 7 - BAL/STRB | Balance/Strobe control | Multi-function pin: current-sink strobe input (100–300 μA) to disable outputs; or balance adjust node when used with external potentiometer. |
| 8 - BALANCE | Offset null terminal | Connects to external 3-kΩ potentiometer wiper for manual offset trimming; shorted to BAL/STRB if strobe-only use. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low power consumption | 900 μW typical at 5 V supply - extends battery life in always-on monitoring systems without sacrificing DC accuracy. |
| Strobe-enabled output disable | Active-low strobe via BAL/STRB pin forces both outputs high-impedance regardless of input state - enables synchronized sampling or power-gated operation. |
| Dual open-drain outputs | Independent EMIT OUT and COL OUT terminals - allow flexible interfacing: EMIT OUT for negative-rail sinking, COL OUT for positive-rail sinking or wired-OR bus sharing. |
| Wide supply flexibility | Operates from single 3 V to ±15 V - eliminates need for dedicated voltage rails in mixed-signal systems with analog sensors and digital controllers. |
| Offset balancing provision | External 3-kΩ potentiometer between BALANCE and BAL/STRB pins reduces input offset to <2 mV - critical for precision reference comparison in instrumentation. |
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: Dual-threshold comparator with strobe gating to sample voltage only during ADC conversion windows. Use Value: 900 μW quiescent power enables continuous monitoring without depleting backup coin cells; open-emitter output interfaces directly to low-voltage microcontroller reset lines. |
Use Scenario: Detecting overtemperature in motor windings using a thermistor divider network feeding into a fixed reference. IC Role / Device Role / Timing Role: Precision DC comparator rejecting noise from EMI-rich industrial environments via wide common-mode range (−14.5 V to 13.5 V). Use Value: 7.5 mV max offset ensures accurate trip points across −25°C to 85°C; 25 mA output drives solid-state relay directly without buffer transistor. |
| Programmable Logic Interface | Power Sequencing Supervisor |
|
Use Scenario: Converting analog enable signals (e.g., 0–3.3 V) into clean 3.3 V logic levels for FPGA configuration control. IC Role / Device Role / Timing Role: Single-supply comparator with COL OUT pulled up to 3.3 V, providing rail-to-rail logic-compatible output. Use Value: 1.2 μs response time meets FPGA startup timing; strobe pin allows synchronization with system clock edge to prevent metastability. |
Use Scenario: Validating correct ramp-up order of multiple DC/DC converter outputs (e.g., 1.2 V before 3.3 V) in embedded computing platforms. IC Role / Device Role / Timing Role: Multi-stage comparator network using LP211DRE4 devices with external resistive dividers to generate precise enable delays. Use Value: Same pinout as LM211 allows drop-in replacement in legacy designs; −25°C to 85°C rating ensures reliability across full system thermal profile. |
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 |
|---|---|---|---|
| LM211DR | Higher supply current (2.5 mA typ), faster response (115 ns), wider temp range (−25°C to 85°C), no strobe pin | Used where speed > power savings; requires redesign for strobe function and layout due to different pinout | Select LM211DR only when sub-μs response is mandatory and strobe control is implemented externally. |
| LP311DR | Identical electrical specs but rated for 0°C to 70°C; same SOIC-8 package and pinout; identical strobe/balance architecture | Suitable for commercial-grade equipment with controlled ambient; lower cost due to relaxed temp qualification | LP311DR is a direct form-fit-function alternative if operating environment stays within 0°C–70°C. |
Compared with LP211DRE4, LM211DR trades 30× higher power for 10× faster response and lacks integrated strobe, while LP311DR matches all features except temperature range - making it a true drop-in alternative for non-industrial applications.
Availability
LP211DRE4 is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial sensor interfaces, and power sequencing supervisors requiring stable component supply across long production lifecycles.
Supply support for LP211DRE4 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 LP211DRE4 belongs to TI's legacy precision analog comparator family, designed specifically for low-power, high-accuracy DC voltage comparison in resource-constrained and thermally demanding environments.
FAQ
What is the maximum supply voltage for LP211DRE4?
The LP211DRE4 supports absolute maximum supply voltages of +18 V on VCC+ and −18 V on VCC−. For reliable operation, recommended supply is ±15 V or single 3 V to 30 V. Exceeding ±18 V risks permanent damage per TI's absolute maximum ratings table in SLCS003D.
Does LP211DRE4 have a built-in voltage reference?
No, the LP211DRE4 does not include an internal voltage reference. It is a standalone differential comparator requiring external reference voltages applied to IN+ or IN−. Reference generation must be handled separately using precision voltage dividers, bandgap references, or DAC outputs.
Can LP211DRE4 operate from a single 3.3 V supply?
Yes, LP211DRE4 operates from a single 3.3 V supply with VCC− tied to ground. Input common-mode range extends from VCC− + 0.5 V (0.5 V) to VCC+ − 1.5 V (1.8 V), and output swing remains functional - confirmed in TI's recommended operating conditions table.
What is the purpose of the BAL/STRB pin on LP211DRE4?
The BAL/STRB pin serves dual functions: as a strobe input (sink 100–300 μA to disable both outputs) or as a balance node (when used with external potentiometer for offset nulling). These modes are mutually exclusive - strobe mode requires current drive; balance mode requires resistive connection to BALANCE pin.
Is LP211DRE4 pin-compatible with LM311?
Yes, LP211DRE4 shares identical pinout and footprint with LM311 in SOIC-8 (D) package, as explicitly stated in TI's datasheet: "Same pinout as LM211, LM311" and "Designed To Be Interchangeable With Industry-Standard LP311". No PCB changes are needed for migration.
LP211DRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
LP211DRE4 FAQ
1.How can I place an order for LP211DRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP211DRE4 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 LP211DRE4 reliable?
The price and inventory of LP211DRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP211DRE4 is usually 5 days.
3.What payment methods are accepted for LP211DRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP211DRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP211DRE4?
LP211DRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP211DRE4 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 LP211DRE4?
For technical support, including LP211DRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP211DRE4 requirements.
6.How does Aetrix verify that LP211DRE4 is sourced from the original manufacturer or authorized distributors?
All LP211DRE4 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 LP211DRE4 meets industry standards.
7.What is the process for return or replacement of LP211DRE4?
All LP211DRE4 units undergo pre-shipment inspection (PSI). If there is an issue with LP211DRE4, 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 LP211DRE4 part is unused and in its original packaging.
Return procedure for LP211DRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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