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Texas Instruments LM56CIMM/NOPB
- Part No.:
- LM56CIMM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM56CIMM/NOPB.pdf
- Description:
- SENSOR ANALOG -40C-125C 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:352
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Product details
Overview
LM56CIM/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 only 230 μA max, enabling thermal monitoring in battery-powered systems like portable electronics and microprocessor thermal management.
For engineers reviewing the LM56CIM/NOPB datasheet, LM56CIM/NOPB pinout, LM56CIM/NOPB application, or LM56CIM/NOPB equivalent, this page delivers verified technical context, exact pin functions, trip-point design methodology, real-world thermal control use cases, and validated alternative parts for industrial and embedded thermal protection designs.
Technical Context
The LM56CIM/NOPB integrates an internal temperature sensor with +6.20 mV/°C output sensitivity and 395 mV offset, feeding two independent comparators referenced to externally set VT1 and VT2 thresholds derived from the 1.250V VREF via resistor dividers. Each comparator includes built-in hysteresis (5°C typical) to prevent output oscillation near trip points.
Its dual open-collector outputs drive external pull-up networks for TTL-level logic compatibility, while VREF requires a precise 50 μA load to maintain trip-point accuracy. The device supports operation across −40°C to +125°C ambient, with trip-point accuracy of ±3°C (max) over the full range for the C-grade variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7V–10V - Enables direct interface with 3.0V or 5V systems without regulation. |
| Supply Current | 230 μA (max) - Supports multi-year battery life in portable thermal monitors. |
| VREF Output | 1.250V ±1% - Stable reference for accurate external resistor-based trip-point setting. |
| Temp Sensor Sensitivity | +6.20 mV/°C - Linear analog output used with VT1/VT2 inputs to define temperature thresholds. |
| Hysteresis | 5°C typical - Prevents chatter during slow thermal transitions; internally fixed, not user-adjustable. |
| Trip Accuracy (−40°C to +125°C) | ±4°C (max) - Guaranteed worst-case error for LM56CIM grade, critical for safety-critical thermal shutdown. |
| Output Type | Open-collector (OUT1/OUT2) - Allows flexible voltage-level translation and wired-OR fan/fault signaling. |
Pinout & Package
LM56CIM/NOPB is housed in an 8-pin SOIC (D) package (JEDEC MS-012, 3.91 mm width), with 1.27 mm lead pitch and 1.75 mm max height. Pin 1 is marked by a beveled corner or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive supply input | Accepts 2.7V–10V; must be bypassed with 0.1 µF capacitor to GND for noise immunity. |
| GND | Ground reference | Common return for all internal circuits and external resistor divider network. |
| VREF | 1.250V bandgap reference output | Must source exactly 50 µA load to meet trip-point accuracy spec; drives R1+R2+R3 divider. |
| VTEMP | Temperature sensor analog output | Outputs (6.20 mV/°C × T) + 395 mV; connects to VT1/VT2 inputs to set trip points. |
| OUT1 | Digital output 1 (active-low) | Goes LOW when temperature exceeds T1; HIGH when below (T1 – 5°C); open-collector, requires pull-up. |
| OUT2 | Digital output 2 (active-low) | Goes LOW when temperature exceeds T2; HIGH when below (T2 – 5°C); open-collector, requires pull-up. |
| VT1 | Comparator 1 threshold input | Compares against VTEMP to trigger OUT1; set by resistor divider from VREF. |
| VT2 | Comparator 2 threshold input | Compares against VTEMP to trigger OUT2; set by second tap on same resistor divider. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent thermal trip points | Enables hierarchical thermal response-e.g., warning at T1, shutdown at higher T2-using single resistor network. |
| Internal 1.250V ±1% voltage reference | Eliminates need for external reference; enables stable trip-point setting across supply and temperature variations. |
| Integrated temperature sensor with +6.20 mV/°C slope | Provides calibrated analog output directly usable for comparator inputs-no calibration required. |
| 5°C typical hysteresis per output | Prevents output oscillation during slow thermal drift; internally generated-no external components needed. |
| SOIC-8 package with industry-standard footprint | Ensures drop-in compatibility with existing layouts; supports automated assembly and reflow per JEDEC MS-012. |
Applications
| Microprocessor Thermal Management | Fan Control |
|---|---|
Use Scenario: Monitoring CPU die temperature in embedded controllers or SoCs to prevent thermal throttling or damage. IC Role / Device Role / Timing Role: LM56CIM/NOPB acts as autonomous thermal decision engine-comparing sensed temperature against two user-defined thresholds without MCU intervention. Use Value: Reduces firmware overhead and system latency in thermal response; OUT1 triggers warning interrupt, OUT2 asserts hardware reset or power-down signal. |
Use Scenario: Controlling cooling fan speed stages in HVAC or industrial enclosures based on ambient or heatsink temperature. IC Role / Device Role / Timing Role: LM56CIM/NOPB provides dual hysteresis-controlled switching: OUT1 activates low-speed fan, OUT2 engages high-speed mode above critical threshold. Use Value: Eliminates need for ADC + software polling; ensures deterministic, jitter-free fan staging with no processor dependency. |
| Portable Battery-Powered Systems | Electronic System Protection |
Use Scenario: Overtemperature cutoff in handheld medical devices or IoT sensors operating from single-cell Li-ion (3.0V–4.2V). IC Role / Device Role / Timing Role: LM56CIM/NOPB serves as ultra-low-power thermal watchdog-drawing only 230 μA while continuously monitoring battery or PCB temperature. Use Value: Extends battery runtime versus microcontroller-based solutions; enables safe operation up to +125°C ambient with ±4°C accuracy. |
Use Scenario: Safeguarding power amplifiers, motor drivers, or LED drivers against thermal runaway in industrial equipment. IC Role / Device Role / Timing Role: LM56CIM/NOPB monitors heatsink temperature via direct mounting; OUT2 asserts fault signal to disable gate driver or cut power supply enable line. Use Value: Provides fail-safe, analog-hardwired protection independent of system firmware-critical for functional safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output thermal monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2995IMS#TRPBF | Single-output, I²C digital output; ±1.5°C accuracy; 2.7V–5.5V supply; no internal VREF or analog sensor. | Requires MCU for configuration and readback; lacks autonomous dual-threshold decision logic. | Select when digital interface, higher accuracy, or programmability outweigh need for autonomous analog decision-making. |
| MAX6505UTA+T | Single-output, open-drain; ±3°C accuracy; 2.7V–5.5V; internal sensor only-no VREF or VT inputs. | Fixed trip point (125°C); no user-configurable thresholds or dual outputs. | Select only for simple overtemperature latch applications where adjustable dual thresholds are unnecessary. |
Compared with LTC2995IMS#TRPBF and MAX6505UTA+T, the LM56CIM/NOPB uniquely delivers two independently configurable thermal trip points using passive resistors, autonomous analog decision logic, and guaranteed ±4°C accuracy over −40°C to +125°C-all within a 230 μA quiescent current budget.
Availability
LM56CIM/NOPB is available at Aetrix Electronics and suitable for microprocessor thermal management, fan control, portable battery-powered 3.0V or 5V systems, and electronic system protection requiring stable component supply and long-term industrial availability.
Supply support for LM56CIM/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 technologies with emphasis on reliability, precision, and energy efficiency.
The LM56 product line was designed specifically for autonomous, low-power thermal monitoring in space-constrained and battery-sensitive applications-providing dual hysteresis-controlled outputs without MCU involvement.
FAQ
What is the operating temperature range for the LM56CIM/NOPB?
The LM56CIM/NOPB is specified to operate across −40°C to +125°C ambient temperature. Its internal temperature sensor and comparators maintain guaranteed performance-including ±4°C trip-point accuracy over this full range-making it suitable for harsh industrial and automotive under-hood environments where thermal protection must remain reliable at extremes.
How do I set the two temperature trip points (T1 and T2) for the LM56CIM/NOPB?
You set T1 and T2 for the LM56CIM/NOPB using three external resistors (R1, R2, R3) connected as a voltage divider from VREF (1.250V) to GND. VT1 = 1.250V × R1/(R1+R2+R3) and VT2 = 1.250V × (R1+R2)/(R1+R2+R3). Since VTEMP = (6.20 mV/°C × T) + 395 mV, solving for R values yields precise trip temperatures-e.g., 75°C and 85°C for fan control hysteresis.
Does the LM56CIM/NOPB require external components to function?
Yes-the LM56CIM/NOPB requires three external resistors to define VT1 and VT2 trip voltages, a 0.1 µF bypass capacitor on V+, and pull-up resistors on OUT1 and OUT2 (open-collector outputs). VREF must source a precise 50 µA load, typically achieved by sizing the resistor divider network to draw that current. No external capacitors are needed on VTEMP or VREF for stability.
What is the difference between LM56CIM/NOPB and LM56BIM/NOPB?
The LM56CIM/NOPB is the C-grade version with ±3°C trip-point accuracy at +25°C and ±4°C over −40°C to +125°C, while the LM56BIM/NOPB is the tighter B-grade with ±2°C/±3°C accuracy. Both share identical pinout, functionality, and SOIC-8 packaging. The "CIM" suffix denotes Commercial Industrial grade (−40°C to +125°C), and "NOPB" indicates lead-free, RoHS-compliant finish.
Can the LM56CIM/NOPB directly drive a cooling fan?
No-the LM56CIM/NOPB outputs (OUT1 and OUT2) are open-collector and rated for ≤50 μA sink current at 0.4V, insufficient to drive even small DC fans. They are intended to interface with external driver circuitry such as MOSFET gates, optocouplers, or logic-level fan controllers. Direct fan connection would violate absolute maximum ratings and cause output failure.
LM56CIMM/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):
- ±3°C (±4°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
LM56CIMM/NOPB FAQ
1.How can I place an order for LM56CIMM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM56CIMM/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 LM56CIMM/NOPB reliable?
The price and inventory of LM56CIMM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM56CIMM/NOPB is usually 5 days.
3.What payment methods are accepted for LM56CIMM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM56CIMM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM56CIMM/NOPB?
LM56CIMM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM56CIMM/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 LM56CIMM/NOPB?
For technical support, including LM56CIMM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM56CIMM/NOPB requirements.
6.How does Aetrix verify that LM56CIMM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM56CIMM/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 LM56CIMM/NOPB meets industry standards.
7.What is the process for return or replacement of LM56CIMM/NOPB?
All LM56CIMM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM56CIMM/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 LM56CIMM/NOPB part is unused and in its original packaging.
Return procedure for LM56CIMM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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