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Texas Instruments LM56CIM/NOPB
- Part No.:
- LM56CIM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM56CIM/NOPB.pdf
- Description:
- SENSOR ANALOG -40C-125C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:11,911
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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 - used for thermal management in microprocessor systems, fan control, and industrial process monitoring.
For engineers reviewing the LM56CIM/NOPB datasheet, LM56CIM/NOPB pinout, LM56CIM/NOPB application, or LM56CIM/NOPB equivalent, this page delivers verified specifications, SOIC-8 package details, trip point accuracy (±3°C max over −40°C to +125°C), VTEMP output linearity (6.20 mV/°C), and real-world thermal protection use cases.
Technical Context
The LM56CIM/NOPB integrates an internal temperature sensor whose output voltage (VTEMP) scales linearly at 6.20 mV/°C with offset 395 mV, feeding two independent comparators referenced to externally set VT1 and VT2 voltages derived from the 1.250V bandgap reference. Each comparator drives an open-collector output with built-in 5°C hysteresis to prevent chatter near trip points.
It operates from 2.7V to 10V supply, draws only 230 μA maximum quiescent current, and supports external resistor networks (R1+R2+R3 = 27 kΩ) to configure dual temperature thresholds - enabling discrete thermal shutdown and staged cooling activation without microcontroller intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V–10V - compatible with 3.0V and 5V battery-powered or industrial systems without level-shifting. |
| Quiescent Current | 230 μA max - enables always-on thermal monitoring in portable and energy-sensitive applications. |
| VREF Output | 1.250V ±1% - stable reference for accurate resistor-divider-based trip point setting across temperature. |
| VTEMP Sensitivity | +6.20 mV/°C - linear analog output allows direct calibration of absolute temperature with known offset (395 mV at 0°C). |
| Temperature Accuracy | ±3°C max (−40°C to +125°C) - specified for LM56CIM grade, sufficient for non-critical thermal protection and fan staging. |
| Hysteresis | 5°C typical - prevents oscillation during slow temperature transitions; internally fixed, no external components needed. |
| Digital Outputs | Open-collector TTL-compatible - supports wired-OR logic, pull-up to any voltage ≤10V, and direct interface to MOSFET gates or optocouplers. |
Pinout & Package
LM56CIM/NOPB is housed in an 8-pin SOIC (D) package (JEDEC MS-012, variation AA), 3.91 mm wide × 4.90 mm long × 1.75 mm max height, with gull-wing leads and RoHS-compliant matte tin (SN) lead finish. Pin 1 is marked by a beveled corner or dot; device orientation follows standard SOIC quadrant Q1 tape feed.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive supply input | Accepts 2.7V–10V; requires 0.1 µF bypass capacitor to GND for noise immunity and stability. |
| GND | Ground reference | Common return for all internal circuits and external resistor network; must be low-impedance. |
| VREF | Bandgap voltage reference output | 1.250V ±1% source; must drive ≤50 µA load to maintain trip point accuracy. |
| VTEMP | Temperature sensor analog output | Linear voltage output: (6.20 mV/°C × T) + 395 mV; max 1500 Ω output impedance. |
| OUT1 | First digital output (active LOW) | Open-collector; goes LOW when T > T1, HIGH when T < (T1 – 5°C); not rated for motor loads. |
| OUT2 | Second digital output (active LOW) | Open-collector; goes LOW when T > T2, HIGH when T < (T2 – 5°C); independent of OUT1 timing. |
| VT1 | Trip point 1 voltage input | Comparator input for OUT1; sets T1 via resistor divider from VREF (e.g., VT1 = 1.250V × R1/(R1+R2+R3)). |
| VT2 | Trip point 2 voltage input | Comparator input for OUT2; sets T2 via same divider (e.g., VT2 = 1.250V × (R1+R2)/(R1+R2+R3)). |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent thermal trip points | Configurable via three external resistors - enables high/low threshold detection (e.g., warning + shutdown) in one IC. |
| Internal temperature sensor with linear output | VTEMP = (6.20 mV/°C × T) + 395 mV - eliminates need for external sensor and ADC in basic thermal feedback loops. |
| Fixed 5°C hysteresis per output | Internally generated - removes requirement for external hysteresis resistors or Schmitt-trigger circuitry. |
| Low-power operation | 230 μA max supply current - suitable for always-on monitoring in battery-backed or energy-harvesting systems. |
| Robust comparator architecture | Input bias current ≤300 nA - minimizes resistor-divider error when using 27 kΩ total network resistance. |
Applications
| Microprocessor Thermal Management | Fan Control |
|---|---|
Use Scenario: Monitoring CPU die temperature on embedded boards to prevent thermal throttling or lockup. IC Role / Device Role / Timing Role: Dual-output thermostat providing early-warning (OUT1) and critical-shutdown (OUT2) signals based on configurable thresholds. Use Value: Enables staged response - e.g., OUT1 triggers fan ramp-up at 75°C, OUT2 forces system reset at 95°C - without firmware involvement. |
Use Scenario: Controlling DC cooling fans in industrial enclosures where ambient temperature varies widely. IC Role / Device Role / Timing Role: Direct drive of fan enable lines via open-collector outputs with built-in hysteresis to avoid rapid cycling. Use Value: Eliminates need for external comparators or microcontroller polling; reduces BOM count and firmware complexity. |
| Portable Battery-Powered Systems | Industrial Process Control |
Use Scenario: Overtemperature protection in handheld medical devices powered by 3.0V Li-ion batteries. IC Role / Device Role / Timing Role: Low-quiescent-current thermal monitor ensuring safe operation under varying load and ambient conditions. Use Value: 230 μA max supply current extends battery life while maintaining reliable thermal guardbanding. |
Use Scenario: Monitoring heat exchanger or motor winding temperature in factory automation equipment. IC Role / Device Role / Timing Role: Standalone thermal switch interfacing with PLC inputs or solid-state relays for safety interlocks. Use Value: −40°C to +125°C operating range and ±3°C accuracy meet industrial environmental requirements without calibration. |
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-output, I²C digital temperature monitor with alert; no analog VTEMP output or resistor-programmable thresholds. | Requires MCU interface and firmware; lacks direct open-collector switching for fan/relay control. | Choose when digital bus integration and programmable alerts outweigh need for analog simplicity and zero-MCU operation. |
| MAX6505ESA+ | Single-output, fixed-threshold (e.g., 125°C) thermal switch in 8-pin SOIC; no VREF, no VTEMP, no user-configurable trip points. | Only provides one hardwired shutdown point; no hysteresis adjustment or dual-stage capability. | Choose only for cost-sensitive single-threshold applications where flexibility and diagnostics are unnecessary. |
Compared with LTC2995IMS8#TRPBF and MAX6505ESA+, the LM56CIM/NOPB uniquely delivers dual independently configurable trip points, analog temperature output, and zero-MCU open-collector switching - making it optimal for deterministic, hardware-only thermal protection architectures.
Availability
LM56CIM/NOPB is available at Aetrix Electronics and suitable for microprocessor thermal management, fan control, and portable battery-powered 3.0V or 5V systems 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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in precision analog ICs and industrial-grade reliability.
The LM56 series belongs to TI's precision temperature sensing product line, designed specifically for hardware-based thermal protection in resource-constrained systems where MCU-free operation, low power, and configurability are essential.
FAQ
What is the operating temperature range of the LM56CIM/NOPB?
The LM56CIM/NOPB is specified to operate from −40°C to +125°C ambient temperature. This full industrial range is guaranteed for all electrical characteristics including trip point accuracy (±3°C max), VREF stability, and output leakage. The internal temperature sensor tracks die temperature closely, and PCB layout - especially thermal coupling to copper planes - directly impacts measurement fidelity.
How do I configure the two temperature trip points for LM56CIM/NOPB?
You configure T1 and T2 for LM56CIM/NOPB using three external resistors (R1, R2, R3) forming a voltage divider from VREF (1.250V). VT1 = 1.250V × R1/(R1+R2+R3) sets OUT1's trip point; VT2 = 1.250V × (R1+R2)/(R1+R2+R3) sets OUT2's. Total resistance should be 27 kΩ to minimize bias current error. Example: For T1 = 75°C and T2 = 90°C, calculate VT1 = 852.5 mV and VT2 = 945.5 mV, then solve for R1, R2, R3.
Does the LM56CIM/NOPB require external hysteresis components?
No, the LM56CIM/NOPB includes fixed 5°C typical hysteresis internally for both OUT1 and OUT2 - no external capacitors, resistors, or feedback paths are needed. This hysteresis is implemented in the comparator stage and ensures stable switching without oscillation during slow temperature ramps, simplifying design and reducing component count.
Can LM56CIM/NOPB directly drive a cooling fan?
No, LM56CIM/NOPB outputs are open-collector and rated only for ≤50 μA sink current - insufficient for driving fan coils or motors directly. They must interface through external driver circuitry such as a small-signal NPN transistor, MOSFET gate driver, or optocoupler. The datasheet explicitly states "not intended to directly drive a fan motor" due to output current limitations.
What is the accuracy specification for LM56CIM/NOPB over temperature?
The LM56CIM/NOPB has a trip point accuracy of ±3°C maximum over the full −40°C to +125°C operating range. At +25°C, accuracy is ±3°C max; from +25°C to +85°C, it remains ±3°C max. This includes errors from VREF tolerance, comparator offset, and temperature sensitivity drift - but excludes external resistor tolerance effects, which add ~±0.4°C for 0.5% resistors.
LM56CIM/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):
- ±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-SOIC
LM56CIM/NOPB FAQ
1.How can I place an order for LM56CIM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM56CIM/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 LM56CIM/NOPB reliable?
The price and inventory of LM56CIM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM56CIM/NOPB is usually 5 days.
3.What payment methods are accepted for LM56CIM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM56CIM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM56CIM/NOPB?
LM56CIM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM56CIM/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 LM56CIM/NOPB?
For technical support, including LM56CIM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM56CIM/NOPB requirements.
6.How does Aetrix verify that LM56CIM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM56CIM/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 LM56CIM/NOPB meets industry standards.
7.What is the process for return or replacement of LM56CIM/NOPB?
All LM56CIM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM56CIM/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 LM56CIM/NOPB part is unused and in its original packaging.
Return procedure for LM56CIM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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