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Texas Instruments LM56BIMM/NOPB
- Part No.:
- LM56BIMM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM56BIMM/NOPB.pdf
- Description:
- SENSOR ANALOG -40C-125C 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,264
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Product details
Overview
LM56BIMM/NOPB from Texas Instruments is a precision dual-output low-power thermostat IC with internal temperature sensing, two open-collector digital outputs (OUT1/OUT2), 1.250V ±1% bandgap reference, and 5°C typical hysteresis. It operates from 2.7V to 10V supply and draws ≤230 μA, enabling thermal monitoring in microprocessor systems, fan control, and industrial process control.
For engineers reviewing the LM56BIMM/NOPB datasheet, LM56BIMM/NOPB pinout, LM56BIMM/NOPB application, or LM56BIMM/NOPB equivalent, this device delivers verified trip point accuracy (±2°C max over −40°C to +85°C), resistor-programmable dual thresholds, and VSSOP-8 packaging optimized for space-constrained thermal management designs.
Technical Context
The LM56BIMM/NOPB integrates an internal temperature sensor with 6.20 mV/°C output sensitivity and two independent comparators that compare VT1/VT2 analog inputs-derived from external resistor dividers of the 1.250V reference-against the sensor voltage. Each comparator includes built-in hysteresis (5°C typical) to prevent output oscillation near trip points.
Its open-collector outputs (OUT1, OUT2) drive TTL-compatible loads and require external pull-up resistors. The VREF pin supplies a stable 1.250V reference with ±1% error and must be loaded with 50 μA for specified trip accuracy; VTEMP provides the raw sensor voltage for external calibration or secondary processing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V–10V - supports both 3.0V and 5V systems without level-shifting |
| Quiescent Current | ≤230 μA - enables battery-powered operation for >1 year in low-duty-cycle thermal monitoring |
| VREF Output | 1.250V ±1% - precision reference for setting accurate, resistor-defined trip points |
| Hysteresis | 5°C typical - prevents chatter during slow temperature transitions near setpoints |
| Trip Accuracy (−40°C to +85°C) | ±2°C max - guaranteed for LM56B grade, critical for reliable thermal shutdown margins |
| Temperature Sensitivity | +6.20 mV/°C - linear sensor output enables direct voltage-to-temperature conversion |
| Output Type | Open-collector (OUT1/OUT2) - allows wired-OR logic and flexible pull-up voltage selection up to 10V |
Pinout & Package
VSSOP-8 (DGK) package: 3.0 mm × 3.0 mm, 1.1 mm max height, lead pitch 0.65 mm, exposed thermal pad (PowerPAD™), RoHS-compliant matte tin (SN) finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive supply input | Bypass with 0.1 µF capacitor to GND; supports 2.7–10V operation |
| GND | Ground reference | Common return for supply, reference, sensor, and outputs |
| VREF | 1.250V bandgap reference output | Must source 50 µA load for specified trip accuracy; drives external resistor divider |
| VTEMP | Internal temperature sensor output | Provides 395 mV + 6.20 mV/°C signal; 1500 Ω max 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 | Comparator 1 threshold input | Accepts resistor-divider voltage from VREF to set first trip point T1 |
| VT2 | Comparator 2 threshold input | Accepts resistor-divider voltage from VREF to set second trip point T2 |
Key Features
| Feature | Design Value |
|---|---|
| Dual programmable trip points | Two independent thresholds (T1, T2) set via external resistors on VT1/VT2 pins |
| Integrated temperature sensing | No external sensor required; monolithic die temperature measurement with 6.20 mV/°C linearity |
| Low-power operation | 230 μA max supply current enables use in always-on thermal supervision circuits |
| Stable internal reference | 1.250V ±1% VREF ensures consistent trip point definition across voltage and temperature |
| Guaranteed hysteresis | 5°C typical internal hysteresis eliminates need for external positive feedback networks |
Applications
| Microprocessor Thermal Management | Fan Control |
|---|---|
Use Scenario: Monitoring CPU die temperature to trigger throttling or shutdown before thermal damage occurs. IC Role / Device Role / Timing Role: Dual-output thermostat providing independent high-temp alert (OUT1) and critical shutdown (OUT2) signals. Use Value: Enables precise, resistor-tuned response at 80°C (alert) and 95°C (shutdown) with ±2°C accuracy over −40°C to +85°C. |
Use Scenario: Activating cooling fans in portable electronics or industrial enclosures based on ambient or heatsink temperature. IC Role / Device Role / Timing Role: Temperature-triggered switch driving fan enable lines via open-collector outputs with pull-up resistors. Use Value: Eliminates external comparators and references; hysteresis prevents fan cycling near setpoint, extending motor life. |
| Industrial Process Control | Electronic System Protection |
Use Scenario: Monitoring cabinet temperature in PLCs or power converters to prevent component derating or failure. IC Role / Device Role / Timing Role: Localized thermal sensor and decision element interfacing directly with controller GPIO or relay drivers. Use Value: Operates reliably from −40°C to +125°C ambient; VSSOP-8 footprint minimizes PCB area in dense control modules. |
Use Scenario: Safeguarding battery-powered medical devices or test equipment against overheating during extended operation. IC Role / Device Role / Timing Role: Standalone thermal watchdog asserting fault signals to system supervisor ICs or microcontrollers. Use Value: Low 230 μA quiescent current preserves battery life while maintaining continuous protection coverage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output thermostat applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMT70AIDGKR | Analog-output precision temperature sensor (±0.1°C) with I²C interface; no built-in comparators or digital outputs | Requires external MCU or comparator circuitry to implement dual-threshold logic | Choose when higher sensor accuracy and digital communication are needed, not standalone switching |
| MAX6505ASA+ | Single-output thermostat in SO-8; fixed 45°C trip point; no resistor programming or dual thresholds | Lacks programmability and second output; limited to single-point overtemperature detection | Choose only for cost-sensitive, single-threshold applications where flexibility is not required |
Compared with LMT70AIDGKR and MAX6505ASA+, the LM56BIMM/NOPB uniquely delivers factory-trimmed dual programmable thresholds, integrated reference, and open-collector outputs in one VSSOP-8 package-enabling immediate thermal switching without firmware or additional components.
Availability
LM56BIMM/NOPB is available at Aetrix Electronics and suitable for microprocessor thermal management, fan control, and industrial process control requiring stable component supply and long-term design continuity.
Supply support for LM56BIMM/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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in precision analog ICs and thermal solutions.
The LM56 series belongs to TI's precision analog temperature sensing product line, designed specifically for low-power, resistor-programmable thermal monitoring in space-constrained and battery-operated systems.
FAQ
What is the operating temperature range of the LM56BIMM/NOPB?
The LM56BIMM/NOPB is rated for operation from −40°C to +125°C ambient temperature. This full industrial range is validated per the LM56BIM grade specification and applies to all electrical characteristics including trip point accuracy, reference stability, and output behavior. The LM56BIMM/NOPB maintains ±2°C trip accuracy from −40°C to +85°C, making it suitable for demanding thermal supervision tasks in harsh environments.
How do I set the two temperature trip points (T1 and T2) for the LM56BIMM/NOPB?
You set T1 and T2 by connecting external resistors R1, R2, and R3 between VREF, VT1, VT2, and GND to form two voltage dividers. With R1+R2+R3 = 27 kΩ, VT1 = 1.250V × R1/(R1+R2+R3) and VT2 = 1.250V × (R1+R2)/(R1+R2+R3). Since VTEMP = 395 mV + 6.20 mV/°C × T, solving for T gives T1 = (VT1 − 395 mV)/6.20 mV/°C. The LM56BIMM/NOPB datasheet provides exact resistor calculation examples.
Does the LM56BIMM/NOPB require external components to function?
Yes-the LM56BIMM/NOPB requires three external resistors (R1, R2, R3) to define VT1 and VT2 trip voltages, plus pull-up resistors on OUT1 and OUT2 (typically 4.7 kΩ to V+). A 0.1 µF bypass capacitor on V+ to GND is also mandatory for stable operation. No external sensor or reference is needed, as both are integrated. The LM56BIMM/NOPB is not functional without these minimal external components.
What is the purpose of the VREF pin on the LM56BIMM/NOPB?
The VREF pin on the LM56BIMM/NOPB provides a precision 1.250V ±1% bandgap voltage reference used to generate VT1 and VT2 threshold voltages via external resistor dividers. To maintain guaranteed trip point accuracy, VREF must source a 50 µA load-typically achieved by connecting the resistor network. Using VREF directly as a system reference is possible but requires careful load management to avoid degrading LM56BIMM/NOPB thermal performance.
Can the LM56BIMM/NOPB directly drive a fan motor?
No-the LM56BIMM/NOPB cannot directly drive a fan motor. Its OUT1 and OUT2 pins are open-collector outputs rated for ≤50 µA sink current and 0.4V max low-level voltage at 50 µA. These outputs are intended to interface with logic inputs, optocouplers, or transistor bases-not inductive loads. To control a fan, use the LM56BIMM/NOPB outputs to enable a MOSFET or driver IC such as the TI DRV8876 or discrete NPN/PNP pair.
LM56BIMM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-VSSOP
LM56BIMM/NOPB FAQ
1.How can I place an order for LM56BIMM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM56BIMM/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 LM56BIMM/NOPB reliable?
The price and inventory of LM56BIMM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM56BIMM/NOPB is usually 5 days.
3.What payment methods are accepted for LM56BIMM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM56BIMM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM56BIMM/NOPB?
LM56BIMM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM56BIMM/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 LM56BIMM/NOPB?
For technical support, including LM56BIMM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM56BIMM/NOPB requirements.
6.How does Aetrix verify that LM56BIMM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM56BIMM/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 LM56BIMM/NOPB meets industry standards.
7.What is the process for return or replacement of LM56BIMM/NOPB?
All LM56BIMM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM56BIMM/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 LM56BIMM/NOPB part is unused and in its original packaging.
Return procedure for LM56BIMM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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