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Texas Instruments LP311DG4
- Part No.:
- LP311DG4
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP311DG4.pdf
- Description:
- IC LP STRB DIFF COMPARATR 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,350
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Product details
Overview
LP311DG4 from Texas Instruments is a low-power differential comparator with strobe capability, designed for precision voltage comparison in battery-powered and industrial systems. It features 7.5 mV max input offset voltage at 25°C, 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 LP311DG4 datasheet, LP311DG4 pinout, LP311DG4 application, or LP311DG4 equivalent, this device is selected for low-quiescent-current analog monitoring, threshold detection with strobe gating, and legacy LM311 drop-in replacement where power efficiency is prioritized over ultrafast response.
Technical Context
The LP311DG4 implements a bipolar transistor-based comparator core with separate emitter and collector output terminals, enabling flexible pull-up configuration and rail-to-rail output swing below VCC−. Its strobe input (BAL/STRB) allows active-low output disable independent of input states, supporting synchronized sampling or power-gated sensing.
It integrates ion-implanted precision resistors for stable offset balancing via external potentiometer on the BALANCE pin, and supports wide common-mode input range (−14.5 V to 13.5 V with ±15 V supplies), making it suitable for high-side or ground-referenced sensing in mixed-supply systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | Single 3 V to ±15 V - enables direct integration into 3.3 V logic systems or legacy ±15 V analog rails without level-shifting. |
| Input Offset Voltage | 7.5 mV max at 25°C - defines worst-case DC error in threshold detection; sufficient for medium-precision applications like battery charge-state monitoring. |
| Response Time | 1.2 μs typical - balances speed and power; adequate for line-frequency monitoring, motor stall detection, and slow-control-loop comparators. |
| Quiescent Current | 300 μA max total supply current - achieves ~900 μW power at 5 V, extending battery life in portable instrumentation and remote sensors. |
| Output Drive | 25 mA sink capability - directly drives LEDs, relays, or logic inputs without external buffer transistors. |
| Strobe Input Current | 100–300 μA low-level drive - compatible with TTL/CMOS logic outputs; avoids need for series resistors or active drivers. |
Pinout & Package
LP311DG4 is housed in an 8-pin SOIC (D) package, 3.91 mm width, 1.75 mm max height, RoHS-compliant NIPDAU lead finish, MSL Level-1 rated for unlimited 260°C reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BALANCE | Offset null adjustment terminal | Connects to external 3-kΩ potentiometer wiper for manual input offset trimming; improves DC accuracy in precision threshold circuits. |
| 2 - IN− | Inverting input | Accepts reference or feedback signal; common-mode range extends to −14.5 V with ±15 V supplies, supporting high-side current sensing. |
| 3 - IN+ | Non-inverting input | Receives sensed signal; differential input voltage tolerance up to ±30 V prevents damage during transient overvoltage events. |
| 4 - VCC− | Negative supply rail | Serves as return path for both supply current and output sink current; emitter output can swing below this rail by up to 30 V. |
| 5 - EMIT OUT | Emitter output terminal | Provides low-side switching node; when pulled low, delivers up to 25 mA to load tied between VCC− and this pin. |
| 6 - COL OUT | Collector output terminal | Enables high-side or floating load configurations; used with external pull-up to VCC+ for inverted logic-compatible outputs. |
| 7 - BAL/STRB | Strobe / balance select | Active-low enable: pulling ≤0.3 V disables output regardless of input state; also serves as balance terminal when shorted to Pin 1. |
| 8 - VCC+ | Positive supply rail | Supports single-supply operation down to 3 V; internal biasing remains stable across full operating temperature range (0°C to 70°C). |
Key Features
| Feature | Design Value |
|---|---|
| Low-power operation | 900 μW typical at 5 V - reduces thermal load and extends runtime in coin-cell or energy-harvesting systems. |
| Strobe-enabled output disable | Hardware-gated output control eliminates software polling delays and ensures deterministic timing in synchronized measurement systems. |
| Wide supply flexibility | Operates from single 3 V to dual ±15 V - eliminates need for auxiliary regulators in mixed-voltage industrial controllers. |
| Open-emitter/open-collector outputs | Independent EMIT OUT and COL OUT pins allow wired-OR logic, level translation, or bidirectional interface design without external components. |
| Offset balancing | External trim via BALANCE and BAL/STRB pins enables <5 mV residual offset after calibration - critical for accurate zero-crossing detection. |
Applications
| Battery Voltage Monitor | Industrial Threshold Detector |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during charging/discharging to trigger cutoff or alert at 3.0 V and 4.2 V thresholds. IC Role / Device Role / Timing Role: Precision comparator comparing cell voltage against resistor-divider references; strobe synchronizes sampling to ADC conversion windows. Use Value: 300 μA quiescent current minimizes self-discharge; 7.5 mV offset ensures reliable 50 mV hysteresis implementation without additional op-amps. |
Use Scenario: Detecting overtemperature in motor windings using a thermistor-based voltage divider in PLC I/O modules. IC Role / Device Role / Timing Role: High-common-mode comparator rejecting noise on long sensor leads; strobe disables output during system reset to prevent false trips. Use Value: −14.5 V to 13.5 V input range accommodates thermistor signals referenced to −12 V supply rails; 25 mA sink drives optocoupler LED directly. |
| Legacy LM311 Replacement | Power-Supply Sequencing Controller |
|
Use Scenario: Upgrading existing designs using LM311 to reduce standby power while retaining identical PCB layout and BOM footprint. IC Role / Device Role / Timing Role: Pin-compatible functional substitute with same D-package pinout and strobe/balance functionality. Use Value: Same 8-pin SOIC outline and electrical interface eliminates redesign; 30× lower power enables fanless enclosure designs without thermal derating. |
Use Scenario: Enforcing strict power-on sequence for FPGA + DDR memory subsystems by enabling downstream rails only after primary 12 V stabilizes. IC Role / Device Role / Timing Role: Window comparator formed with two LP311DG4 units monitoring pre-regulated voltages; strobe pins gated by microcontroller GPIO. Use Value: Dual open-drain outputs simplify wired-AND logic for sequencing enable signals; 1.2 μs response ensures sub-microsecond delay in fault propagation paths. |
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 |
|---|---|---|---|
| LM311DR | Higher 5.5 mA supply current, 115 ns response time, no guaranteed 3-V operation | Preferred where speed >10× faster response is required and power budget allows ≥5× higher quiescent draw | Select LM311DR only when sub-200 ns propagation delay is mandatory and thermal/power constraints permit. |
| TLV3011DBVR | Rail-to-rail input, 1.8 V min supply, 65 μA IQ, but single-supply only and no strobe function | Used in ultra-low-voltage IoT sensors where 3-V minimum is insufficient and strobe gating is unnecessary | Choose TLV3011DBVR for sub-3-V battery systems lacking strobe requirements; not suitable for ±15 V or strobed applications. |
Compared with LM311DR and TLV3011DBVR, the LP311DG4 uniquely balances ultra-low power, wide supply range, strobe control, and legacy compatibility-making it optimal for cost-sensitive industrial upgrades and battery-powered equipment requiring deterministic disable capability.
Availability
LP311DG4 is available at Aetrix Electronics and suitable for battery management systems, industrial PLC input modules, legacy equipment modernization, and power-supply sequencing controllers requiring stable component supply across extended production lifecycles.
Supply support for LP311DG4 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 and embedded processing solutions, with decades of expertise in precision analog ICs and industrial-grade reliability.
The LP311DG4 belongs to TI's legacy low-power comparator product line, engineered specifically for energy-constrained applications where robustness, wide supply tolerance, and pin compatibility with industry-standard parts outweigh raw speed requirements.
FAQ
What is the operating temperature range for LP311DG4?
The LP311DG4 is characterized for operation from 0°C to 70°C ambient temperature. This commercial-grade rating aligns with standard industrial control environments and consumer electronics enclosures without forced cooling. The device maintains specified input offset voltage, response time, and output drive performance across this full range, as validated in TI's SLCS003D datasheet revision September 2003.
Does LP311DG4 support true single-supply operation below 5 V?
Yes, LP311DG4 supports single-supply operation down to 3 V, with guaranteed functionality including 25 mA output sink capability and 7.5 mV max input offset voltage at 25°C. At 3 V, supply current remains under 300 μA, and the common-mode input range adjusts to VCC− + 0.5 V to VCC+ − 1.5 V per recommended operating conditions - enabling direct use with 3.3 V microcontrollers and sensors.
How is the strobe function implemented on LP311DG4?
The strobe function on LP311DG4 is implemented on Pin 7 (BAL/STRB): pulling this pin to ≤0.3 V with 100–300 μA current forces both EMIT OUT and COL OUT into high-impedance off-state, regardless of IN+ and IN− voltages. This is not a logic-level enable but a current-sink interface - direct connection to ground is prohibited; instead, drive via open-collector gate or current-limited CMOS output.
Can LP311DG4 replace LM311 in existing PCB layouts?
Yes, LP311DG4 in SOIC (D) package shares identical pinout, footprint, and terminal functions with LM311D, including BALANCE, BAL/STRB, EMIT OUT, and COL OUT assignments. No PCB changes are required for drop-in replacement. However, designers must verify that reduced response time (1.2 μs vs. 115 ns) and lower supply current meet system timing and noise immunity requirements.
What is the maximum differential input voltage rating for LP311DG4?
The absolute maximum differential input voltage (VID) for LP311DG4 is ±30 V, defined as the voltage between IN+ and IN− pins. This rating is independent of supply voltage and ensures robustness against transient overvoltages in motor control feedback or industrial sensor interfaces. Exceeding ±30 V risks permanent damage, per TI's SLCS003D absolute maximum ratings table.
LP311DG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- 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:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
LP311DG4 FAQ
1.How can I place an order for LP311DG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP311DG4 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 LP311DG4 reliable?
The price and inventory of LP311DG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP311DG4 is usually 5 days.
3.What payment methods are accepted for LP311DG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP311DG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP311DG4?
LP311DG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP311DG4 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 LP311DG4?
For technical support, including LP311DG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP311DG4 requirements.
6.How does Aetrix verify that LP311DG4 is sourced from the original manufacturer or authorized distributors?
All LP311DG4 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 LP311DG4 meets industry standards.
7.What is the process for return or replacement of LP311DG4?
All LP311DG4 units undergo pre-shipment inspection (PSI). If there is an issue with LP311DG4, 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 LP311DG4 part is unused and in its original packaging.
Return procedure for LP311DG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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