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Texas Instruments LM311PWR
- Part No.:
- LM311PWR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM311PWR.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,641
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Product details
Overview
LM311PWR from Texas Instruments is a single high-speed voltage comparator with open-collector output, designed for precision level detection in industrial and embedded systems. It delivers 165 ns response time, supports ±15 V or single 5-V supply operation, and drives loads up to 40 V at 50 mA - enabling direct TTL/MOS interfacing and relay/solenoid control in power management circuits.
For engineers reviewing the LM311PWR datasheet, LM311PWR pinout, LM311PWR application, or LM311PWR equivalent, this page provides verified electrical parameters, strobe-enabled functional modes, thermal metrics for TSSOP-8 packaging, and real-world implementation guidance for zero-crossing detection, peak sensing, and oscillator design.
Technical Context
The LM311PWR uses a PNP input stage enabling input common-mode range down to VCC− − 0.7 V, and features dual output terminals (COL OUT and EMIT OUT) allowing flexible load referencing to ground, VCC+, or VCC−. Its strobe input (BAL/STRB) enables synchronous comparison gating with −3 mA current drive requirement.
Offset balancing is supported via dedicated BALANCE pin, and wire-OR capability is enabled by open-collector COL OUT. The device operates across 0°C to +70°C, with input bias current ≤300 nA and input offset voltage ≤7.5 mV - critical for low-drift analog thresholding in sensor signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Response time | 165 ns high-to-low; enables sub-microsecond decision latency in timing-critical comparators |
| Supply voltage range | 3.5 V to 30 V total; supports single 5-V logic rails or dual ±15-V op-amp supplies |
| Output voltage swing | Up to 40 V collector-to-emitter; allows direct switching of industrial loads without level-shifting |
| Input bias current | Max 300 nA at 25°C; minimizes loading error on high-impedance sensor sources |
| Input offset voltage | Max 7.5 mV over full temperature range; defines minimum detectable differential voltage |
| Strobe current | −3 mA required at BAL/STRB; ensures reliable output disable without short-to-ground risk |
| Operating temperature | 0°C to +70°C; validated for commercial-grade embedded control and instrumentation |
Pinout & Package
TSSOP-8 package (3.00 mm × 4.40 mm), moisture sensitivity level 1 (MSL-1), lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: EMIT OUT | Emitter output terminal | Provides low-side switching reference; connects directly to load return path for grounded-load configurations |
| 2: IN+ | Noninverting input | Accepts reference or signal input; common-mode range extends to VCC− − 0.7 V |
| 3: IN− | Inverting input | Accepts threshold or feedback signal; differential comparison determines output state |
| 4: VCC− | Negative supply rail | Reference for internal circuitry; required even in single-supply operation (may be tied to ground) |
| 5: BALANCE | Offset null adjustment | Connects external potentiometer to trim input offset voltage; improves DC accuracy in precision thresholds |
| 6: BAL/STRB | Strobe control input | Current-sink input requiring −3 mA to disable output; prevents false triggering during system synchronization |
| 7: COL OUT | Collector output terminal | Open-collector NPN output; requires external pullup for logic-high generation and wire-OR bus compatibility |
| 8: VCC+ | Positive supply rail | Primary power input; supports up to +30 V; bypass capacitor recommended for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Strobe-enabled comparison | Hardware-gated decision window via BAL/STRB pin, eliminating race conditions in sampled-data systems |
| Wide supply flexibility | Operates from 3.5 V to 30 V total supply; eliminates need for separate logic-level translators in mixed-rail designs |
| Isolated output referencing | COL OUT and EMIT OUT allow load connection to ground, VCC+, or VCC− - enabling floating load driving |
| Low input bias current | ≤300 nA maximum ensures minimal error when comparing signals from high-impedance sources (e.g., thermistors, photodiodes) |
| Wire-OR compatible output | Open-collector COL OUT supports multiple comparators sharing one pullup resistor - simplifies multi-threshold logic |
Applications
| Zero-Crossing Detection | Oscillator Circuits |
|---|---|
Use Scenario: Detecting AC waveform polarity transitions in motor control or power supply feedback loops. IC Role / Device Role / Timing Role: Voltage comparator comparing sinusoidal input against 0-V reference with strobe-synchronized sampling. Use Value: 165 ns response ensures accurate zero-crossing capture at 50/60 Hz and harmonics up to 10 kHz without phase lag. |
Use Scenario: Generating stable square-wave clocks in relaxation oscillators or crystal-based timing circuits. IC Role / Device Role / Timing Role: Core comparator element in hysteresis-based multivibrator topologies with external RC timing network. Use Value: Open-collector output and fast edge rate enable clean 100-kHz free-running oscillation with minimal jitter. |
| Peak Detector Systems | Industrial Load Switching |
Use Scenario: Capturing maximum amplitude of transient sensor signals in data acquisition front-ends. IC Role / Device Role / Timing Role: Comparator driving sample-and-hold latch via EMIT OUT to trigger hold capacitor charging. Use Value: Dual output terminals allow direct emitter-follower interface to hold capacitor, minimizing charge injection error. |
Use Scenario: Controlling solenoids, relays, or indicator lamps in PLC I/O modules and building automation panels. IC Role / Device Role / Timing Role: High-voltage comparator output stage switching 24–48 V DC loads with 50 mA sink capability. Use Value: 40 V collector-output rating and robust thermal performance (RθJA = 162°C/W) support continuous industrial duty cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393DR | Dual comparator in SOIC-8; lower supply current (0.4 mA vs 6 mA), but slower response (1.3 µs) and no strobe or BALANCE pins | Lacks strobe gating and offset trimming - unsuitable for synchronized sampling or precision DC thresholding | Select LM393DR only for low-power, non-critical dual-comparator needs where speed and adjustability are secondary |
| TLV3011DBVR | Single comparator in SOT-23-6; rail-to-rail input, 350 ns response, 1.8–5.5 V supply only; no EMIT OUT or BAL/STRB | Not compatible with bipolar supplies or >5 V loads; lacks isolated output referencing and strobe control | Choose TLV3011DBVR for battery-powered, low-voltage systems requiring rail-to-rail inputs - not for industrial 24 V switching |
Compared with LM311PWR, LM393DR trades speed and configurability for integration and power efficiency, while TLV3011DBVR offers modern low-voltage precision at the cost of supply flexibility and industrial output drive capability.
Availability
LM311PWR is available at Aetrix Electronics and suitable for industrial automation, power supply monitoring, and embedded sensor interface applications requiring stable component supply and long-term manufacturability.
Supply support for LM311PWR 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 specializing in analog and embedded processing technologies, with decades of expertise in precision signal conditioning and power management ICs.
The LM311PWR belongs to TI's legacy high-speed comparator product line, engineered for robust industrial and instrumentation applications where reliability, wide supply range, and flexible output configuration are essential.
FAQ
What is the maximum output voltage swing supported by the LM311PWR?
The LM311PWR supports up to 40 V collector-to-emitter output voltage under recommended operating conditions. This rating applies specifically to the LM311 variant (not LM111/LM211), enabling direct interface with 24 V and 36 V industrial control loads without external level-shifting circuitry. The 40 V limit is defined in Absolute Maximum Ratings and validated across the 0°C to +70°C operating range.
Can the LM311PWR operate from a single 5-V supply?
Yes, the LM311PWR can operate from a single 5-V supply, as confirmed in the Features section and Recommended Operating Conditions table. In this configuration, VCC− is typically tied to ground, and the input common-mode range extends from 0.5 V to 3.5 V. The output remains compatible with TTL logic levels when using an appropriate pullup resistor on COL OUT.
How does the BAL/STRB pin function in the LM311PWR?
The BAL/STRB pin on the LM311PWR serves a dual purpose: it enables strobe-controlled output disable when pulled to −3 mA, and supports offset balancing when used with the BALANCE pin. When active (current-sunk), it forces the output into high-impedance state regardless of input differential - critical for synchronized sampling. TI explicitly warns against shorting this pin to ground due to its current-sink requirement.
What is the thermal resistance (RθJA) of the LM311PWR in its TSSOP-8 package?
The LM311PWR in TSSOP-8 package has a junction-to-ambient thermal resistance (RθJA) of 162°C/W, as specified in Thermal Information Table 6.4. This value assumes standard JEDEC PCB mounting conditions and is higher than PDIP or SOIC variants due to the smaller footprint and thinner body - requiring attention to copper pour and airflow in thermally constrained layouts.
Does the LM311PWR include an internal ESD protection structure?
Yes, the LM311PWR includes integrated ESD protection rated per JEDEC standards: ±500 V HBM (Human Body Model) and ±750 V CDM (Charged Device Model). These ratings are documented in Section 6.2 and reflect TI's manufacturing process hardening - sufficient for standard handling in ESD-controlled environments but not intended for direct board-level ESD event suppression.
LM311PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 1
- Output Type:
- DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL
- Voltage - Supply, Single/Dual (±):
- 3.5V ~ 30V, ±1.75V ~ 15V
- :
- 7.5mV @ ±15V
- Voltage - Input Offset (Max):
- 0.25µA @ ±15V
- Current - Input Bias (Max):
- 50mA
- Current - Output (Typ):
- 7.5mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-TSSOP
LM311PWR FAQ
1.How can I place an order for LM311PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM311PWR 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 LM311PWR reliable?
The price and inventory of LM311PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM311PWR is usually 5 days.
3.What payment methods are accepted for LM311PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM311PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM311PWR?
LM311PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM311PWR 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 LM311PWR?
For technical support, including LM311PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM311PWR requirements.
6.How does Aetrix verify that LM311PWR is sourced from the original manufacturer or authorized distributors?
All LM311PWR 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 LM311PWR meets industry standards.
7.What is the process for return or replacement of LM311PWR?
All LM311PWR units undergo pre-shipment inspection (PSI). If there is an issue with LM311PWR, 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 LM311PWR part is unused and in its original packaging.
Return procedure for LM311PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM311PWR Tags
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