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Texas Instruments LM311PWG4
- Part No.:
- LM311PWG4
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM311PWG4.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,597
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Product details
Overview
LM311PWG4 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 - used in zero-crossing detectors, peak detectors, and TTL/MOS interface circuits.
For engineers reviewing the LM311PWG4 datasheet, LM311PWG4 pinout, LM311PWG4 application, or LM311PWG4 equivalent, key selection criteria include its strobe-enabled input isolation, emitter/collector dual-output flexibility, ±14.7 V common-mode input range, and 0°C to +70°C operating temperature specification.
Technical Context
The LM311PWG4 uses a PNP input stage enabling rail-to-rail sensing near VCC−, followed by high-gain amplification and an isolated-emitter NPN open-collector output stage. Its BAL/STRB pin enables external offset trimming or synchronous gating of comparison activity.
Unlike standard comparators, the LM311PWG4 allows load referencing to ground, VCC+, or VCC− due to fully isolated inputs and outputs. Strobe functionality forces high-impedance output regardless of input differential when current is sunk from BAL/STRB (–3 mA to –5 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Response time | 165 ns high-to-low; enables fast edge detection in oscillator and timing circuits |
| Input offset voltage | Max 7.5 mV at 25°C; defines minimum detectable voltage difference before output switching |
| Input bias current | Max 300 nA at full temperature range; ensures minimal loading on high-impedance sensor sources |
| Common-mode input range | –14.7 V to +13.8 V (vs. VCC± = ±15 V); supports wide-range signal monitoring without clamping |
| Output voltage capability | Up to 40 V collector-to-emitter; permits direct driving of relays, lamps, or logic families at higher voltages |
| Supply voltage range | 3.5 V to 30 V total (VCC+ − VCC−); compatible with ±15 V op-amp rails or single 5-V logic supplies |
| Operating temperature | 0°C to +70°C; specified for commercial-grade industrial control and instrumentation applications |
Pinout & Package
TSSOP-8 package (3.00 mm × 4.40 mm body), moisture-sensitive level 1, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EMIT OUT | Emitter output terminal | Provides low-side switching path referenced to VCC−; used for grounded-load configurations |
| 2 - IN+ | Noninverting input | Accepts reference or signal input; PNP input stage enables operation within 1.5 V of VCC− |
| 3 - IN− | Inverting input | Accepts threshold or feedback signal; differential comparison determines output state |
| 4 - VCC− | Negative supply pin | Reference node for internal circuitry and emitter output; supports dual-supply or ground-referenced operation |
| 5 - BALANCE | Offset null adjustment | Connects external potentiometer to minimize input offset voltage; improves DC accuracy in precision thresholds |
| 6 - BAL/STRB | Strobe control input | Sinks –3 mA to –5 mA to disable output; enables synchronized sampling or gated comparison windows |
| 7 - COL OUT | Collector output terminal | Open-collector NPN output; requires external pullup to define logic-high level and drive capability |
| 8 - VCC+ | Positive supply pin | Primary power rail; sets upper bound for output swing and input common-mode range |
Key Features
| Feature | Design Value |
|---|---|
| Strobe-enabled comparison | External current-sink control (BAL/STRB) forces high-Z output independent of input, enabling time-gated decision logic |
| Dual-output topology | Separate EMIT OUT and COL OUT terminals allow flexible load referencing - to ground, VCC+, or VCC− |
| Rail-sensing PNP input | Operates with inputs as low as VCC− + 0.5 V, supporting low-voltage signal monitoring without level shifters |
| Wire-OR capable output | Open-collector COL OUT supports wired-logic bus architectures (e.g., interrupt lines shared across multiple comparators) |
| Isolated input/output structure | Inputs and outputs are galvanically isolated from system ground, enabling floating measurements and level-shifting interfaces |
Applications
| Zero-Crossing Detection | Oscillator & Timing 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 to generate clean digital edges. Use Value: 165 ns response ensures sub-microsecond timing resolution; dual-supply operation supports ±12 V AC inputs directly. |
Use Scenario: Building free-running multivibrators or crystal-based clock generators for non-critical timing. IC Role / Device Role / Timing Role: Core comparator in hysteresis-based relaxation oscillator with external RC network. Use Value: Strobe pin enables start/stop control of oscillation; 40 V output swing drives CMOS or discrete transistor stages. |
| Peak Detection | TTL/MOS Level Translation |
|
Use Scenario: Capturing maximum amplitude of analog sensor signals (e.g., audio envelope, pulse height). IC Role / Device Role / Timing Role: Comparator latching peak voltage via diode-capacitor hold circuit with reset control. Use Value: Low input bias current (≤300 nA) prevents capacitor discharge drift; wide supply range accommodates 3.3 V or 5 V hold logic. |
Use Scenario: Interfacing legacy 12 V or 24 V industrial sensors to 3.3 V/5 V microcontrollers or FPGAs. IC Role / Device Role / Timing Role: Level-shifting comparator converting high-voltage analog thresholds into logic-compatible signals. Use Value: 40 V collector output safely sinks 24 V loads; ±14.7 V common-mode range accepts unbuffered sensor outputs directly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM311DR | Same electrical specs and pinout; SOIC-8 package instead of TSSOP-8; slightly higher RθJA (114.3°C/W vs. 162°C/W) | Better thermal performance in high-density layouts where TSSOP footprint is constrained | Select LM311DR for manual soldering or legacy board compatibility; LM311PWG4 preferred for space-constrained PCBs |
| TLV3011DBVR | Low-power (11 µA ICC), rail-to-rail input, but only 5.5 V max supply; 300 ns response; SOT-23-6 package | Not suitable for >5.5 V or high-voltage load driving; optimized for battery-powered precision sensing | Choose TLV3011DBVR only for ultra-low-power, single-supply ≤5.5 V designs requiring rail-to-rail input - not a drop-in replacement |
Compared with LM311DR and TLV3011DBVR, the LM311PWG4 uniquely balances high-voltage operation (up to 40 V), strobe control, and compact TSSOP packaging - making it optimal for industrial interface and timing applications where supply flexibility and synchronization matter.
Availability
LM311PWG4 is available at Aetrix Electronics and suitable for zero-crossing detection, peak detection, oscillator design, and TTL/MOS level translation requiring stable component supply across commercial temperature ranges.
Supply support for LM311PWG4 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 LM311 series belongs to TI's legacy precision comparator product line, engineered for robust voltage comparison in noisy, high-voltage, and mixed-supply environments - especially where strobe control and output flexibility are critical.
FAQ
What is the maximum supply voltage rating for LM311PWG4?
The LM311PWG4 has an absolute maximum supply voltage rating of 36 V (VCC+ − VCC−), with individual rail limits of +18 V on VCC+ and –18 V on VCC−. For reliable operation, TI specifies a recommended range of 3.5 V to 30 V total supply differential. Exceeding these values risks permanent device damage per the Absolute Maximum Ratings table in the SLCS007K datasheet.
Does LM311PWG4 support single-supply operation?
Yes, the LM311PWG4 supports true single-supply operation down to 3.5 V total supply (e.g., VCC+ = 5 V, VCC− = 0 V). Its PNP input stage allows inputs to swing within 0.5 V of VCC−, and the open-collector output can be pulled up to any voltage ≤40 V - enabling direct interfacing with 3.3 V or 5 V logic while monitoring higher-voltage signals.
How does the BAL/STRB pin function in LM311PWG4?
In the LM311PWG4, the BAL/STRB pin serves dual roles: as a balance terminal for offset nulling (when used with external resistors), or as a strobe input that disables the output when current is sunk (–3 mA to –5 mA). When strobed, the output enters high-impedance state regardless of input differential - enabling synchronized sampling or gated comparison windows in timing-critical systems.
What is the purpose of the separate EMIT OUT and COL OUT pins on LM311PWG4?
The LM311PWG4 provides two independent output terminals: COL OUT (collector) and EMIT OUT (emitter). COL OUT is an open-collector NPN output requiring an external pullup; EMIT OUT provides the emitter node, allowing loads to be connected between VCC− and EMIT OUT for low-side switching. This separation enables flexible load referencing - to ground, VCC+, or VCC− - without additional external transistors.
Can LM311PWG4 drive a relay directly?
Yes, the LM311PWG4 can directly drive small relays via its COL OUT pin with an appropriate pullup resistor and flyback diode. Its output supports up to 40 V collector-to-emitter voltage and 50 mA sink current. For example, with VCC+ = 24 V and a 470 Ω pullup, it delivers ~50 mA - sufficient for many 24 V, 500 mW coil relays. Always include a reverse-biased diode across the coil to suppress inductive kickback.
LM311PWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
LM311PWG4 FAQ
1.How can I place an order for LM311PWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM311PWG4 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 LM311PWG4 reliable?
The price and inventory of LM311PWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM311PWG4 is usually 5 days.
3.What payment methods are accepted for LM311PWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM311PWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM311PWG4?
LM311PWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM311PWG4 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 LM311PWG4?
For technical support, including LM311PWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM311PWG4 requirements.
6.How does Aetrix verify that LM311PWG4 is sourced from the original manufacturer or authorized distributors?
All LM311PWG4 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 LM311PWG4 meets industry standards.
7.What is the process for return or replacement of LM311PWG4?
All LM311PWG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM311PWG4, 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 LM311PWG4 part is unused and in its original packaging.
Return procedure for LM311PWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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