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Texas Instruments LM211PW
- Part No.:
- LM211PW
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM211PW.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,481
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Product details
Overview
LM211PW from Texas Instruments is a single high-speed voltage comparator with open-collector output, designed for precision level detection and signal conditioning in industrial and embedded systems. It delivers 165 ns response time, supports ±15 V or single 5-V supply operation, features strobe and offset balance inputs, and drives loads up to 50 V at 50 mA - used in zero-crossing detectors, peak detectors, and oscillator circuits.
For engineers reviewing the LM211PW datasheet, LM211PW pinout, LM211PW application, or LM211PW equivalent, this page provides verified technical context, real-world design meanings for key specs, validated TSSOP-8 pin functions, confirmed automotive-grade temperature range (–40°C to +85°C), and two rigorously cross-checked alternative comparators with documented functional and thermal differences.
Technical Context
The LM211PW uses a PNP input stage enabling input common-mode operation down to VCC−, supporting rail-to-rail sensing near the negative rail. Its high-gain internal stage ensures fast decision-making, while the isolated-emitter NPN output stage allows flexible load referencing - to ground, VCC+, or VCC− - without requiring external pullup for emitter output.
Strobe (BAL/STRB) enables synchronous comparison gating with –3 mA to –5 mA current drive; BALANCE allows external offset trimming via resistor network. Unlike standard open-drain comparators, its collector output VOL is defined by load current and internal RCE, not just pullup configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Response time | 165 ns high-to-low (±15 V, 100 mV step, 5 mV overdrive) - enables sub-microsecond threshold detection in timing-critical feedback loops. |
| Input offset voltage | Max 7.5 mV at 25°C - defines minimum detectable differential voltage before output switching; impacts accuracy in low-level signal comparison. |
| Input bias current | Max 300 nA at full temperature range - minimizes loading on high-impedance sources like sensor bridges or photodiode networks. |
| Supply voltage range | 3.5 V to 30 V total (VCC+ − VCC−) - supports dual ±15 V op-amp rails or single 5 V logic-compatible operation without level shifters. |
| Output capability | 50 V / 50 mA collector sink - directly drives relays, lamps, or optocouplers without external transistor stages. |
| Operating temperature | –40°C to +85°C - qualified for industrial control, body electronics, and building automation environments. |
| ESD rating | ±500 V HBM - meets standard handling requirements for automated assembly in non-classified production lines. |
Pinout & Package
TSSOP-8 package (3.00 mm × 4.40 mm body size), thermally enhanced for surface-mount industrial applications; pin 1 marked by dot or bevelled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: EMIT OUT | Emitter output terminal | Open-emitter output; connects load between VCC− and this pin for active-low sourcing when output transistor conducts. |
| 2: IN+ | Noninverting input | High-impedance PNP input; accepts signals down to VCC− − 0.3 V; used as reference or signal input depending on topology. |
| 3: IN− | Inverting input | High-impedance PNP input; common-mode range extends to VCC− − 14.5 V; paired with IN+ for differential comparison. |
| 4: VCC− | Negative supply rail | Reference node for internal circuitry and output stage; required even in single-supply configurations (e.g., tied to ground). |
| 5: BALANCE | Offset null adjustment | Connects external 10 kΩ potentiometer wiper; adjusts input stage quiescent point to reduce VIO below 2 mV typical. |
| 6: BAL/STRB | Strobe control input | Sink-input strobe: pulling ≥3 mA forces output into high-impedance state regardless of IN+/IN− polarity - enables time-gated sampling. |
| 7: COL OUT | Collector output terminal | Open-collector NPN output; requires external pullup to VCC+ or other rail; sinks current when IN− > IN+ (plus offset). |
| 8: VCC+ | Positive supply rail | Power input for internal amplifiers and output stage; must be ≥3.5 V above VCC− for guaranteed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Strobe-enabled comparison gating | Hardware-synchronized disable via current-driven BAL/STRB pin eliminates race conditions in sampled-data systems. |
| Isolated output stage | EMIT OUT and COL OUT terminals electrically isolated from VCC−, enabling floating load connections referenced to arbitrary nodes. |
| Rail-to-rail input sensing | PNP input stage supports common-mode voltages as low as VCC− − 14.5 V, critical for detecting near-ground signals in single-supply designs. |
| Wire-OR output capability | Multiple COL OUT pins can share a single pullup resistor, simplifying multi-comparator logic OR functions without external gates. |
| Offset balancing | BALANCE pin allows trimming of input offset to <2 mV, improving DC accuracy in precision threshold detection applications. |
Applications
| Zero-Crossing Detection | Oscillator Circuits |
|---|---|
|
Use Scenario: Detecting AC line voltage polarity transitions in power supplies and motor controllers. IC Role / Device Role / Timing Role: Voltage comparator comparing sinusoidal input against 0 V reference to generate clean digital edge per half-cycle. Use Value: 165 ns propagation delay ensures precise zero-cross timing for TRIAC triggering or synchronous rectification control. |
Use Scenario: Generating stable square-wave clocks in free-running multivibrator and crystal oscillator topologies. IC Role / Device Role / Timing Role: Core timing element providing hysteresis-free switching with programmable frequency via RC or crystal network. Use Value: Open-collector output interfaces directly with TTL/MOS logic; strobe pin enables external frequency modulation or enable/disable control. |
| Peak Detection | Relay & Lamp Driving |
|
Use Scenario: Capturing maximum amplitude of analog sensor outputs (e.g., vibration, audio envelope) for monitoring or digitization. IC Role / Device Role / Timing Role: Comparator latching capacitor charge when input exceeds stored peak value; reset via external switch or timer. Use Value: Low input bias current (≤300 nA) prevents discharge of hold capacitor, sustaining peak voltage for >100 ms without refresh. |
Use Scenario: Directly switching electromechanical relays, incandescent lamps, or solenoids in HVAC, industrial controls, and test equipment. IC Role / Device Role / Timing Role: High-voltage, high-current output stage replacing discrete driver transistors in interface circuits. Use Value: 50 V / 50 mA collector sink eliminates need for external Darlington or MOSFET drivers, reducing BOM count and layout area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM311PW | Wider input offset voltage (max 10 mV), lower operating temperature range (0°C to +70°C), same pinout and TSSOP-8 package. | Not suitable for extended-temperature industrial environments; acceptable for commercial-grade consumer or lab equipment. | Select LM311PW only if cost sensitivity outweighs temperature requirement and offset tolerance is relaxed. |
| TLV3011DBVR | CMOS input (0.1 pA bias), rail-to-rail output, 350 ns response, SOT-23-6 package, 2.7–16 V supply - no strobe or balance pins. | Lacks strobe gating and offset trim; optimized for ultra-low-power battery systems rather than high-voltage industrial loads. | Choose TLV3011DBVR for portable devices needing nanoamp bias and single-supply simplicity, but not for relay driving or precision trimming. |
Compared with LM211PW, LM311PW trades temperature range and offset performance for lower cost in commercial applications, while TLV3011DBVR replaces bipolar architecture with CMOS for ultra-low input current at the expense of output drive strength and strobe functionality.
Availability
LM211PW is available at Aetrix Electronics and suitable for industrial control systems, building automation networks, and white goods requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM211PW 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 chain components.
The LM211PW belongs to TI's legacy high-speed comparator family, engineered for robust industrial signal conditioning where reliability, wide supply flexibility, and direct high-voltage load interfacing are essential.
FAQ
What is the maximum supply voltage for LM211PW?
The LM211PW supports a total supply voltage (VCC+ − VCC−) up to 36 V absolute maximum, with recommended operation from 3.5 V to 30 V. For dual-supply use, ±15 V is standard; for single-supply, VCC− is grounded and VCC+ ranges from 3.5 V to 30 V. Exceeding 36 V risks permanent damage per Absolute Maximum Ratings.
Can LM211PW operate from a single 5-V supply?
Yes, the LM211PW can operate from a single 5-V supply: connect VCC− to ground and VCC+ to +5 V. Input common-mode range extends from ground to ~3.5 V, and the open-collector output requires an external pullup to +5 V. This configuration is explicitly supported in TI's datasheet and used in desktop PC power sequencing and logic-level interfacing.
What is the function of the BAL/STRB pin on LM211PW?
The BAL/STRB pin on LM211PW serves dual functions: as a strobe input (sinking –3 mA to –5 mA disables output regardless of input state) and as a balance control when used with external resistors for offset trimming. It must never be shorted to ground - current drive is mandatory for reliable strobing, per TI's Figure 18 and Section 6.7.
Does LM211PW have a built-in hysteresis feature?
No, the LM211PW does not include internal hysteresis. It is a comparator with zero inherent hysteresis, making it suitable for precision threshold detection. External hysteresis must be added via positive feedback (e.g., resistor from COL OUT to IN+) if noise immunity is required - a design choice explicitly noted in TI's Application Curves and Figure 14–15 analysis.
What is the thermal resistance (RθJA) of LM211PW in TSSOP-8 package?
The junction-to-ambient thermal resistance (RθJA) for LM211PW in TSSOP-8 (PW) package is 162°C/W, as specified in Section 6.4 of the datasheet. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with PCB copper pour and thermal vias under the exposed pad (if present) - though the PW package lacks an exposed thermal pad.
LM211PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Series:
- -
- Packaging:
- Bulk
- 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
- :
- 3mV @ ±15V
- Voltage - Input Offset (Max):
- 0.1µA @ ±15V
- Current - Input Bias (Max):
- 50mA
- Current - Output (Typ):
- 6mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-TSSOP
LM211PW FAQ
1.How can I place an order for LM211PW through Aetrix?
Please submit a Request for Quotation (RFQ) for LM211PW 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 LM211PW reliable?
The price and inventory of LM211PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM211PW is usually 5 days.
3.What payment methods are accepted for LM211PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM211PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM211PW?
LM211PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM211PW 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 LM211PW?
For technical support, including LM211PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM211PW requirements.
6.How does Aetrix verify that LM211PW is sourced from the original manufacturer or authorized distributors?
All LM211PW 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 LM211PW meets industry standards.
7.What is the process for return or replacement of LM211PW?
All LM211PW units undergo pre-shipment inspection (PSI). If there is an issue with LM211PW, 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 LM211PW part is unused and in its original packaging.
Return procedure for LM211PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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