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Texas Instruments LM311PSRE4
- Part No.:
- LM311PSRE4
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
LM311PSRE4.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,244
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Product details
Overview
LM311PSRE4 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 features strobe control and offset balancing. It drives loads up to 40 V at 50 mA and interfaces directly with TTL/MOS logic.
For engineers reviewing the LM311PSRE4 datasheet, LM311PSRE4 pinout, LM311PSRE4 application, or LM311PSRE4 equivalent, key selection considerations include its 0°C to +70°C operating range, dual-supply compatibility, emitter/collector output flexibility, strobe-enabled blanking, and open-collector output stage requiring external pullup.
Technical Context
The LM311PSRE4 uses a PNP input stage enabling input common-mode operation down to VCC−, followed by high-gain amplification and an isolated-emitter NPN open-collector output stage. Its BAL/STRB pin enables both offset trimming and synchronous output disable via current-driven strobe (–3 mA to –5 mA).
Unlike standard comparators, the LM311PSRE4 allows independent setting of low-level output voltage (VOL) through emitter referencing, supports wire-OR outputs, and isolates inputs/outputs from system ground-enabling floating load configurations referenced to VCC+, VCC−, or ground.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Response time | 165 ns (high-to-low), measured at ±15 V supply with 5-mV overdrive and 5-pF load - defines minimum pulse-width detection capability |
| Input offset voltage | Max 7.5 mV at 25°C - sets minimum detectable differential voltage without trimming |
| Input bias current | Max 300 nA at full temperature range - enables high-impedance sensor interfacing with minimal loading |
| Output voltage swing | Up to 40 V (collector-to-VCC−) - supports direct relay or lamp driving without level-shifting circuitry |
| Supply voltage range | 3.5 V to 30 V total (VCC+ − VCC−) - accommodates single 5-V logic rails or dual ±15-V op-amp supplies |
| Operating temperature | 0°C to +70°C - qualified for commercial-grade industrial control and instrumentation applications |
| Strobe input current | –3 mA to –5 mA (sinking) - requires active current source to disable output; not compatible with simple grounding |
Pinout & Package
LM311PSRE4 is housed in an 8-pin SOIC package (body size 6.20 mm × 5.30 mm) with gull-wing leads, RoHS-compliant and lead-free per TI's PSRE4 suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: EMIT OUT | Emitter output terminal | Provides low-side switching node referenced to VCC−; used for grounded-load configurations or level-shifted outputs |
| 2: IN+ | Noninverting input | Accepts reference or signal input; common-mode range extends to VCC− (−14.5 V typical) |
| 3: IN− | Inverting input | Accepts signal or threshold input; same common-mode range as IN+ |
| 4: VCC− | Negative supply rail | Reference for internal circuitry and EMIT OUT; supports dual-supply or single-supply (grounded) operation |
| 5: BALANCE | Offset null adjustment | Connects to external potentiometer (typically 10 kΩ) between VCC+ and VCC− to trim input offset voltage |
| 6: BAL/STRB | Strobe / balance select | Current-sinking input: pulls output high-impedance when driven with –3 mA; also used with BALANCE for trimming |
| 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 rail | Power input for internal circuitry; supports up to +18 V absolute max; defines pullup voltage for COL OUT |
Key Features
| Feature | Design Value |
|---|---|
| Strobe-enabled output disable | Active-low current-sink control (–3 mA) forces high-impedance state regardless of input - enables synchronized blanking in multiplexed systems |
| Isolated emitter output | EMIT OUT terminal is internally disconnected from VCC−, allowing load connection to any reference (ground, VCC+, or floating rail) |
| Wire-OR output capability | Multiple LM311PSRE4 devices can share a single pullup resistor and bus - simplifies multi-channel alarm or priority encoding |
| Wide supply compatibility | Operates from 3.5 V to 30 V total supply range - eliminates need for separate voltage regulators in mixed-rail systems |
| High-voltage output drive | COL OUT switches up to 40 V at 50 mA - directly interfaces with relays, LEDs, optocouplers, and discrete power stages |
Applications
| Motor Control Feedback | Power Supply Monitoring |
|---|---|
|
Use Scenario: Detect zero-crossing or overvoltage thresholds in BLDC motor commutation or SMPS feedback loops. IC Role / Device Role / Timing Role: Voltage comparator performing real-time analog threshold comparison with sub-200 ns latency. Use Value: Enables precise timing of gate drive signals and fast fault shutdown (<200 ns response ensures cycle-by-cycle protection). |
Use Scenario: Monitor DC bus voltage in industrial power supplies to trigger brownout or overvoltage alarms. IC Role / Device Role / Timing Role: High-voltage comparator interfacing directly to 24 V or 48 V rails using resistive divider and open-collector output. Use Value: Eliminates level-shifter ICs; COL OUT drives optocoupler LED directly at up to 40 V, ensuring galvanic isolation integrity. |
| Oscillator & Timing Circuits | Sensor Signal Conditioning |
|
Use Scenario: Construct free-running multivibrators or crystal oscillators (e.g., 100-kHz square wave generation). IC Role / Device Role / Timing Role: Core timing element in hysteresis-based relaxation oscillator; BAL/STRB enables frequency modulation or gating. Use Value: Strobe input allows external synchronization or duty-cycle control without additional logic gates or microcontroller intervention. |
Use Scenario: Convert low-current sensor outputs (e.g., photodiodes, thermopiles) into clean digital logic levels. IC Role / Device Role / Timing Role: Precision comparator with <300 nA input bias current minimizing signal-source loading and drift. Use Value: Maintains accuracy of µV-level sensor signals; BALANCE pin enables factory calibration to compensate for sensor offset. |
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 but with standard DR (not PSRE4) RoHS/lead-free marking | No functional difference; identical performance and thermal characteristics (RθJA = 121.8°C/W) | Select LM311DR if standard TI packaging and qualification documentation (e.g., PPAP support) are required over PSRE4-specific tape-and-reel format. |
| TLV3011DBVR | Low-power rail-to-rail comparator (1.8–5.5 V only); 300-ns response; 50-pA input bias; no strobe or BALANCE pins | Not suitable for >5.5 V supplies or strobed systems; lacks high-voltage output drive (max 5.5 V) | Choose TLV3011DBVR only for battery-powered, low-voltage, low-power applications where LM311PSRE4's 40-V drive and strobe are unnecessary. |
Compared with LM311DR, LM311PSRE4 offers identical functionality with TI's enhanced PSRE4 tape-and-reel packaging for automated SMT assembly; versus TLV3011DBVR, it provides 8× higher supply voltage range, 6× faster response, and critical strobe/BALANCE features essential for industrial timing and calibration.
Availability
LM311PSRE4 is available at Aetrix Electronics and suitable for industrial control panels, power supply supervision circuits, and motor feedback systems requiring stable component supply across extended production lifecycles.
Supply support for LM311PSRE4 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 specializing in analog and embedded processing technologies, with decades of leadership in precision analog ICs and industrial-grade components.
The LM311PSRE4 belongs to TI's legacy high-speed comparator product line, engineered for robust operation in noisy industrial environments, supporting wide supply ranges, high-voltage interfacing, and flexible output configurations.
FAQ
What is the maximum supply voltage rating for LM311PSRE4?
The LM311PSRE4 has an absolute maximum supply voltage rating of ±18 V (VCC+ ≤ +18 V, VCC− ≥ −18 V), with a maximum total supply range of 36 V (VCC+ − VCC−). Recommended operating range is 3.5 V to 30 V. Exceeding these limits risks permanent damage, as confirmed in Section 6.1 of the SLCS007K datasheet.
Can LM311PSRE4 operate from a single 5-V supply?
Yes, the LM311PSRE4 is explicitly specified to operate from a single 5-V supply, as stated in the Features section and Section 6.3 (Recommended Operating Conditions). In this configuration, VCC− is connected to ground, VCC+ to +5 V, and the output stage remains fully functional with appropriate pullup and load referencing.
How does the BAL/STRB pin function in LM311PSRE4?
The BAL/STRB pin on the LM311PSRE4 serves dual roles: as a strobe input (sinking –3 mA to –5 mA disables output) and as a balance control node for offset trimming. It must never be shorted to ground; instead, it requires an active current source for strobing or connection to a potentiometer wiper for calibration - per Figure 18 and Section 8.4.1 of the datasheet.
What is the purpose of the EMIT OUT pin on LM311PSRE4?
The EMIT OUT pin provides access to the emitter node of the internal output transistor, enabling load connections referenced to VCC−, ground, or other potentials - unlike conventional open-collector outputs tied to VCC−. This allows flexible level-shifting and floating-load configurations, as detailed in Section 8.3 and Figure 33 of the LM311PSRE4 datasheet.
Does LM311PSRE4 support wire-OR output configurations?
Yes, the LM311PSRE4 supports wire-OR outputs via its open-collector COL OUT pin. Multiple devices can share a single pullup resistor and output bus, enabling logical OR functions (e.g., multi-channel alarm aggregation) without external logic gates - explicitly confirmed in the Description section and Section 8.4.1 of the official datasheet.
LM311PSRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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-SO
LM311PSRE4 FAQ
1.How can I place an order for LM311PSRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM311PSRE4 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 LM311PSRE4 reliable?
The price and inventory of LM311PSRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM311PSRE4 is usually 5 days.
3.What payment methods are accepted for LM311PSRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM311PSRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM311PSRE4?
LM311PSRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM311PSRE4 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 LM311PSRE4?
For technical support, including LM311PSRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM311PSRE4 requirements.
6.How does Aetrix verify that LM311PSRE4 is sourced from the original manufacturer or authorized distributors?
All LM311PSRE4 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 LM311PSRE4 meets industry standards.
7.What is the process for return or replacement of LM311PSRE4?
All LM311PSRE4 units undergo pre-shipment inspection (PSI). If there is an issue with LM311PSRE4, 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 LM311PSRE4 part is unused and in its original packaging.
Return procedure for LM311PSRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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