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Texas Instruments LP311DRG4
- Part No.:
- LP311DRG4
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP311DRG4.pdf
- Description:
- IC COMPARATOR 1 DIFF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,619
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Product details
Overview
LP311DRG4 from Texas Instruments is a low-power differential comparator with strobe capability in an 8-pin SOIC package. It features 900 μW typical power consumption at 5 V, 1.2 μs typical response time, ±15 V or single 3–30 V supply operation, and emitter-collector open-drain outputs capable of 25 mA sink current. It is used in battery-powered voltage monitoring, precision threshold detection, and enable-control circuits where low quiescent current is critical.
For engineers reviewing the LP311DRG4 datasheet, LP311DRG4 pinout, LP311DRG4 application, or LP311DRG4 equivalent, key selection considerations include its strobe-enabled output disable function, wide common-mode input range (−14.5 V to 13.5 V at ±15 V), 7.5 mV max input offset voltage at 25°C, and compatibility with LM311-based designs requiring reduced power draw.
Technical Context
The LP311DRG4 implements a bipolar-input comparator core with ion-implanted resistor networks enabling 30× lower power than the LM311 while retaining functional pinout and strobe control. Its dual-output structure (emitter and collector) supports flexible interfacing with TTL, CMOS, or relay drivers without external pull-ups when using the emitter output.
Strobe functionality is implemented via a current-sinking input (BAL/STRB) that forces output high-impedance when pulled low with 100–300 μA - not direct grounding - enabling synchronized blanking in multi-comparator systems or noise-immune timing windows.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | Single 3–30 V or dual ±15 V - supports battery-backed and industrial rail voltages without level-shifting. |
| Quiescent Current | 150–300 μA total (ICC+ + |ICC−|) - enables multi-year operation on coin cells in portable sensors. |
| Input Offset Voltage | 7.5 mV max at 25°C - sets minimum detectable voltage difference in precision window comparators. |
| Response Time | 1.2 μs typical (100 mV step, 5 mV overdrive) - suitable for line-frequency monitoring but not MHz-level signal discrimination. |
| Output Drive | 25 mA sink capability at VOL ≤ 1.5 V - directly drives LEDs, small relays, or logic inputs without buffer stages. |
| Common-Mode Range | −14.5 V to 13.5 V at ±15 V supply - allows direct sensing of signals referenced to negative rails or ground in mixed-supply systems. |
| Strobe Input Current | 100–300 μA required to disable output - ensures robust noise immunity versus voltage-driven enable schemes. |
Pinout & Package
LP311DRG4 is housed in an 8-pin SOIC (D) package per JEDEC MS-012, 3.91 mm body width, 1.75 mm max height, with standard 1.27 mm pitch. Pin 1 identifier located at top-left corner with beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BALANCE | Offset null adjustment | Connects to external potentiometer wiper for trimming input offset voltage down to near-zero. |
| 2 - IN− | Inverting input | Differential input node; accepts signals up to ±15 V relative to midpoint of supplies. |
| 3 - IN+ | Non-inverting input | Differential input node; same voltage range and impedance as IN−. |
| 4 - VCC− | Negative supply rail | Reference for emitter output swing; emitter can go below this rail by up to 0.4 V. |
| 5 - VCC+ | Positive supply rail | Power connection; supports single or split supply configurations. |
| 6 - COL OUT | Collector output | Open-collector NPN output; requires external pull-up for logic-high assertion. |
| 7 - BAL/STRB | Balance/strobe dual-function | When used as strobe: sinking 100–300 μA disables both outputs; when unused: shorted to BALANCE for offset trim. |
| 8 - EMIT OUT | Emitter output | Open-emitter NPN output; sinks current to VCC−; can swing below VCC− by up to 0.4 V. |
Key Features
| Feature | Design Value |
|---|---|
| Low-power operation | 900 μW typical at 5 V - reduces thermal load and extends battery life in always-on monitoring nodes. |
| Strobe-enabled output disable | Hardware-controlled blanking via current-sink input eliminates need for software gating or external logic. |
| Dual-output topology | Separate emitter and collector outputs allow independent interface to different logic families or loads. |
| Wide supply flexibility | Operates from single 3 V up to ±15 V - eliminates dedicated bias rails in mixed-voltage systems. |
| Industry-standard pinout | Pin-compatible with LM311 and LP211 - enables drop-in replacement in legacy designs with no PCB changes. |
Applications
| Battery Voltage Monitor | Overvoltage Protection Circuit |
|---|---|
|
Use Scenario: Detecting low battery condition in handheld medical devices before shutdown threshold. IC Role / Device Role / Timing Role: Differential comparator comparing battery voltage against precision reference to assert low-battery flag. Use Value: 150 μA supply current extends operational life between charges; strobe input synchronizes flag assertion with system sleep cycles. |
Use Scenario: Shutting down DC-DC converter input when input voltage exceeds safe limit in telecom power modules. IC Role / Device Role / Timing Role: High-side voltage monitor comparing scaled input rail to fixed threshold; output drives MOSFET gate driver. Use Value: −14.5 V to 13.5 V common-mode range allows direct sensing without attenuator; 25 mA sink drives gate directly. |
| Programmable Threshold Sensor | Zero-Crossing Detector with Blanking |
|
Use Scenario: Configurable trip point in industrial temperature controller using DAC-adjusted reference. IC Role / Device Role / Timing Role: Comparator with adjustable hysteresis and offset trim for stable switching at user-defined setpoints. Use Value: BALANCE and BAL/STRB pins support real-time calibration and dynamic threshold updates without firmware intervention. |
Use Scenario: AC line synchronization in motor drive inverters with noise-immune zero-crossing detection. IC Role / Device Role / Timing Role: Precision comparator detecting sine wave crossing with strobe-blanked output during high-dv/dt transitions. Use Value: 1.2 μs response time resolves 50/60 Hz zero crossings; strobe input suppresses false triggers from EMI spikes. |
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 mA supply current; 200 ns response time; no strobe function; same SOIC-8 pinout. | Preferred where speed >10× faster response is required and power budget allows. | Select LM311DR only if design requires sub-microsecond propagation delay and strobe is unnecessary. |
| LP211DR | Same architecture and specs, but rated for −25°C to 85°C operating range vs. LP311DRG4's 0°C to 70°C. | Suitable for extended-temperature industrial or automotive under-hood environments. | Choose LP211DR when ambient temperature exceeds 70°C or falls below 0°C; otherwise LP311DRG4 offers cost advantage. |
Compared with LM311DR, LP311DRG4 trades speed for 30× lower power and adds strobe control; compared with LP211DR, it shares identical electrical behavior but targets commercial-temperature applications with tighter offset voltage specification at room temperature.
Availability
LP311DRG4 is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial voltage supervision, and programmable logic interface circuits requiring stable component supply across production lifecycles.
Supply support for LP311DRG4 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 over 90 years of innovation in precision analog ICs and power management.
The LP311DRG4 belongs to TI's legacy low-power comparator family designed specifically for energy-constrained applications where LM311 compatibility and minimal quiescent current are primary requirements.
FAQ
What is the maximum supply voltage rating for LP311DRG4?
The LP311DRG4 supports absolute maximum supply voltages of +18 V on VCC+ and −18 V on VCC−. In recommended operation, the total supply span (VCC+ − VCC−) must stay within 3.5 V to 30 V. Exceeding these limits risks permanent damage, as confirmed in the SLCS003D datasheet absolute maximum ratings table.
Does LP311DRG4 require external pull-up resistors on its outputs?
Only the COL OUT (pin 6) requires an external pull-up resistor to establish a logic-high state; the EMIT OUT (pin 8) is an open-emitter output referenced to VCC− and does not need a pull-up. The LP311DRG4 datasheet confirms COL OUT is open-collector and EMIT OUT is open-emitter, each with distinct termination requirements.
Can the strobe function of LP311DRG4 be used to disable output during power-up?
Yes - pulling the BAL/STRB pin (pin 7) low with 100–300 μA current forces both outputs into high-impedance state regardless of input conditions, making it ideal for power-up sequencing. The LP311DRG4 datasheet explicitly states strobe overrides normal comparator action, and Figure 2 shows TTL-level strobe control via transistor.
Is LP311DRG4 RoHS compliant?
Yes, LP311DRG4 is RoHS compliant per TI's Package Option Addendum, which lists "Yes" under RoHS for all active SOIC (D) variants including LP311DR and LP311DRG4. Lead finish is NIPDAU, and MSL rating is Level-1-260C-UNLIM.
How does LP311DRG4 differ from LP311DR in terms of packaging and marking?
LP311DRG4 uses the same SOIC-8 (D) package as LP311DR but carries G4 suffix indicating TI's green packaging standard (halogen-free, lead-free, RoHS-compliant). Both share identical electrical specs and top-side marking "LP311", per TI's ordering information table and Package Materials Information documents.
LP311DRG4 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:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
LP311DRG4 FAQ
1.How can I place an order for LP311DRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP311DRG4 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 LP311DRG4 reliable?
The price and inventory of LP311DRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP311DRG4 is usually 5 days.
3.What payment methods are accepted for LP311DRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP311DRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP311DRG4?
LP311DRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP311DRG4 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 LP311DRG4?
For technical support, including LP311DRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP311DRG4 requirements.
6.How does Aetrix verify that LP311DRG4 is sourced from the original manufacturer or authorized distributors?
All LP311DRG4 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 LP311DRG4 meets industry standards.
7.What is the process for return or replacement of LP311DRG4?
All LP311DRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LP311DRG4, 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 LP311DRG4 part is unused and in its original packaging.
Return procedure for LP311DRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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