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Texas Instruments LM56BIM/NOPB
- Part No.:
- LM56BIM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM56BIM/NOPB.pdf
- Description:
- SENSOR ANALOG -40C-125C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:344
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Product details
Overview
LM56BIM/NOPB from Texas Instruments is a precision dual-output low-power thermostat IC with internal temperature sensing, two open-collector digital outputs (OUT1 and OUT2), 1.250 V ±1% bandgap reference, and ±2°C trip point accuracy at +25°C. It operates from 2.7 V to 10 V and draws only 230 μA max supply current, enabling use in battery-powered thermal protection circuits such as microprocessor thermal management and fan control.
For engineers reviewing the LM56BIM/NOPB datasheet, LM56BIM/NOPB pinout, LM56BIM/NOPB application, or LM56BIM/NOPB equivalent, this device supports configurable dual-temperature thresholds via external resistor networks, integrates hysteresis (5°C typical), and delivers stable trip points across −40°C to +125°C for industrial and embedded thermal monitoring.
Technical Context
The LM56BIM/NOPB implements two independent comparators with internal hysteresis, each comparing the internal temperature sensor output (VTEMP = 395 mV + 6.20 mV/°C × T) against externally set trip voltages VT1 and VT2 derived from the 1.250 V reference and three resistors. Its analog front-end includes a 1500 Ω max output impedance temperature sensor and 300 nA max comparator bias current.
Digital outputs are open-collector, TTL-compatible, and active-low: OUT1 asserts LOW above T1 and releases HIGH below (T1 – 5°C); OUT2 follows the same logic for T2. The device requires no external power supply decoupling beyond a 0.1 µF capacitor on V+, and its thermal response is governed by PCB lead conduction rather than ambient air.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 10 V - supports both 3.0 V and 5.0 V systems without level-shifting |
| Supply Current | 230 μA (max) - enables multi-year operation on coin-cell batteries |
| VREF Output | 1.250 V ±1% - stable reference for accurate resistor-divider-based trip point setting |
| Temperature Sensor Sensitivity | +6.20 mV/°C - linear output voltage vs. die temperature, calibrated at 395 mV @ 0°C |
| Tripping Hysteresis | 5°C typical - prevents output oscillation near threshold due to thermal noise or slow transients |
| Trip Point Accuracy | ±2°C (max) at +25°C - guaranteed over full operating range (−40°C to +125°C) |
| Output Type | Open-collector, TTL-level - allows wired-OR configuration and direct interface to MCU GPIO or logic gates |
Pinout & Package
LM56BIM/NOPB is housed in an 8-pin SOIC (D) package (JEDEC MS-012, variation AA), 3.91 mm × 4.90 mm footprint, 1.75 mm max height, with standard gull-wing leads and RoHS-compliant Sn lead finish. Pin 1 is marked by a beveled corner or index notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive supply input | Accepts 2.7–10 V; must be bypassed with 0.1 µF capacitor to GND |
| GND | Ground reference | Common return for all internal circuitry and external resistor network |
| VREF | 1.250 V bandgap reference output | Sources 50 µA load; used to generate VT1 and VT2 via external R1/R2/R3 divider |
| VTEMP | Temperature sensor analog output | Linear voltage output: 395 mV + 6.20 mV/°C × T; max 1500 Ω output impedance |
| OUT1 | Digital output 1 (active-low) | Goes LOW when T > T1; HIGH when T < (T1 – 5°C); open-collector, requires pull-up |
| OUT2 | Digital output 2 (active-low) | Goes LOW when T > T2; HIGH when T < (T2 – 5°C); open-collector, requires pull-up |
| VT1 | Trip voltage input 1 | Comparator 1 inverting input; sets first temperature threshold via resistor divider |
| VT2 | Trip voltage input 2 | Comparator 2 inverting input; sets second temperature threshold via resistor divider |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent thermal trip points | Configurable T1 and T2 thresholds using single 1.250 V reference and three external resistors |
| Integrated hysteresis | 5°C typical internal hysteresis eliminates need for external feedback components |
| Low quiescent current | 230 μA max enables always-on thermal monitoring in portable 3.0 V/5.0 V systems |
| Stable reference and sensor | 1.250 V ±1% VREF and ±2°C trip accuracy ensure repeatable, production-ready thresholds |
| Robust output drive | Open-collector outputs tolerate up to +10 V and sink ≥50 μA while maintaining 0.4 V LOW-level |
Applications
| Microprocessor Thermal Management | Fan Control |
|---|---|
Use Scenario: Monitoring CPU die temperature in embedded controllers to prevent thermal throttling or shutdown. IC Role / Device Role / Timing Role: Dual-threshold thermostat providing independent high-temp alert (OUT1) and critical overtemp shutdown signal (OUT2). Use Value: Enables staged cooling response: fan starts at T1 (e.g., 75°C), full-speed or system reset triggers at T2 (e.g., 85°C), with built-in 5°C hysteresis preventing chatter. |
Use Scenario: Controlling DC cooling fans in industrial enclosures where ambient temperature varies widely. IC Role / Device Role / Timing Role: Temperature-sensing comparator generating ON/OFF control signals based on heatsink or chassis temperature. Use Value: Eliminates need for external ADC, op-amps, or microcontroller firmware-direct hardware-based fan activation with ±2°C accuracy over −40°C to +125°C. |
| Portable Battery-Powered Systems | Industrial Process Control |
Use Scenario: Protecting Li-ion battery packs or power management ICs from overheating during charging or discharge. IC Role / Device Role / Timing Role: Low-power thermal watchdog asserting fault signals to battery fuel gauge or charger IC. Use Value: 230 μA supply current extends battery life; dual outputs allow separate alerts for warning (T1) and emergency cutoff (T2) without additional logic. |
Use Scenario: Monitoring temperature of PLC I/O modules or motor drives in factory automation cabinets. IC Role / Device Role / Timing Role: Standalone thermal protector interfacing directly with opto-isolated inputs or relay drivers. Use Value: SOIC packaging supports automated assembly; −40°C to +125°C rating ensures reliability in uncontrolled industrial environments without calibration drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output thermostat applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2995IMS8#TRPBF | Single 1.25 V reference, but adds I²C interface and programmable thresholds; higher supply current (500 μA) | Requires MCU host for configuration; supports dynamic threshold adjustment and remote readback | Select when digital configurability and telemetry outweigh ultra-low power needs. |
| MAX6505ESA+ | Single-output, no VREF output, fixed 1.25 V internal reference; ±3°C accuracy (C-grade), 12 μA supply current | Lacks dual trip capability and external resistor flexibility; optimized for minimal footprint and lowest power | Select for cost-sensitive, single-threshold applications where board space and quiescent current are paramount. |
Compared with LM56BIM/NOPB, LTC2995 offers digital control at higher power and complexity, while MAX6505 provides lower power and smaller size but sacrifices dual outputs and resistor-programmable thresholds-making LM56BIM/NOPB optimal for fixed dual-threshold, analog-configured thermal protection.
Availability
LM56BIM/NOPB is available at Aetrix Electronics and suitable for microprocessor thermal management, fan control, and portable battery-powered 3.0 V or 5.0 V systems requiring stable component supply across extended temperature ranges.
Supply support for LM56BIM/NOPB 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, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and industrial-grade performance.
The LM56 series belongs to TI's precision analog temperature sensing product line, designed specifically for hardware-based thermal protection in resource-constrained embedded systems without MCU intervention.
FAQ
What is the operating temperature range of the LM56BIM/NOPB?
The LM56BIM/NOPB is specified to operate from −40°C to +125°C. Its trip point accuracy is guaranteed at ±2°C maximum over this full range, making it suitable for harsh industrial and automotive under-hood environments. The internal temperature sensor tracks die temperature, and thermal response depends on PCB layout and lead conduction-not ambient air.
How do I configure the two temperature trip points T1 and T2 for LM56BIM/NOPB?
T1 and T2 are set using three external resistors (R1, R2, R3) connected between VREF, VT1, VT2, and GND. With R1+R2+R3 = 27 kΩ, VT1 = 1.250 V × R1/(R1+R2+R3) and VT2 = 1.250 V × (R1+R2)/(R1+R2+R3). Then solve T1 = (VT1 − 395 mV)/6.20 mV/°C and similarly for T2. TI provides design calculators and application notes for precise resistor selection.
Does LM56BIM/NOPB require external pull-up resistors on its outputs?
Yes, LM56BIM/NOPB features open-collector outputs (OUT1 and OUT2), so external pull-up resistors to V+ or another logic rail are mandatory. Typical values range from 4.7 kΩ to 10 kΩ. These resistors define the HIGH-level voltage and current-sinking capability; the outputs can sink ≥50 μA while maintaining ≤0.4 V LOW-level.
Can LM56BIM/NOPB directly drive a fan motor?
No, LM56BIM/NOPB cannot directly drive a fan motor. Its outputs are rated for ≤50 μA sink current and are intended for logic-level signaling only. To control a fan, interface OUT1 or OUT2 to a transistor, MOSFET gate driver, or dedicated fan controller IC. The datasheet explicitly states these outputs "are not intended to directly drive a fan motor."
What is the purpose of the VREF pin on LM56BIM/NOPB, and how should it be used?
The VREF pin delivers a precision 1.250 V ±1% bandgap reference used to generate VT1 and VT2 trip voltages via external resistor dividers. It must source a nominal 50 μA load to maintain accuracy; loading outside 30–50 μA degrades trip point stability. Do not leave VREF floating or connect it directly to high-impedance nodes-always tie it into the R1/R2/R3 network as shown in TI's typical application diagrams.
LM56BIM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Sensor Type:
- Analog, Local
- Sensing Temperature - Local:
- -40°C ~ 125°C
- Sensing Temperature - Remote:
- -
- Output Type:
- Analog Voltage
- Voltage - Supply:
- 2.7V ~ 10V
- Resolution:
- 6.2mV/°C
- Features:
- Output Switch
- Accuracy - Highest (Lowest):
- ±2°C (±3°C)
- Test Condition:
- 25°C ~ 85°C (-40°C ~ 125°C)
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
LM56BIM/NOPB FAQ
1.How can I place an order for LM56BIM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM56BIM/NOPB 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 LM56BIM/NOPB reliable?
The price and inventory of LM56BIM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM56BIM/NOPB is usually 5 days.
3.What payment methods are accepted for LM56BIM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM56BIM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM56BIM/NOPB?
LM56BIM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM56BIM/NOPB 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 LM56BIM/NOPB?
For technical support, including LM56BIM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM56BIM/NOPB requirements.
6.How does Aetrix verify that LM56BIM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM56BIM/NOPB 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 LM56BIM/NOPB meets industry standards.
7.What is the process for return or replacement of LM56BIM/NOPB?
All LM56BIM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM56BIM/NOPB, 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 LM56BIM/NOPB part is unused and in its original packaging.
Return procedure for LM56BIM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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