My Inquiry
My Account
Texas Instruments LM56CIMM
- Part No.:
- LM56CIMM
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM56CIMM.pdf
- Description:
- SENSOR ANALOG -40C-125C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,580
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM56CIMM 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 LM56CIMM datasheet, LM56CIMM pinout, LM56CIMM application, or LM56CIMM equivalent, this page delivers verified specifications, VSSOP-8 package details, trip-point configuration methodology, and real-world thermal protection use cases - all grounded in TI's SNIS120G revision G datasheet.
Technical Context
The LM56CIMM 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 voltages derived from the 1.250V bandgap reference via resistor dividers. Its dual-threshold architecture enables discrete high/low-temperature event detection without external logic.
Each comparator includes built-in hysteresis (5°C typical) and drives open-collector outputs capable of sinking up to 50 µA while maintaining TTL-compatible logic levels. The device operates across −40°C to +125°C with supply current capped at 230 µA over 2.7V–10V input range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7V–10V - supports direct connection to 3.0V or 5V system rails without regulation. |
| Quiescent Current | 230 µA max - enables battery-powered operation for months in portable thermal monitoring. |
| VREF Output | 1.250V ±1% - stable reference for precise resistor-divider-based trip-point setting. |
| Temp Sensor Sensitivity | +6.20 mV/°C - linear analog output enabling accurate ambient or junction temperature derivation. |
| Hysteresis | 5°C typical - prevents output oscillation near trip points in noisy thermal environments. |
| Trip Accuracy (−40°C to +125°C) | ±4°C max - specified for LM56CIM grade, critical for safety-critical thermal shutdown margins. |
| Digital Outputs | Open-collector, TTL-level compatible - allows wired-OR logic and flexible pull-up voltage selection. |
Pinout & Package
VSSOP-8 (DGK) package: 3.0 mm × 3.0 mm, 1.1 mm max height, exposed pad optional, RoHS-compliant, moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive supply input | Bypass with 0.1 µF capacitor to GND; supports 2.7V–10V operation. |
| GND | Ground reference | Common return for supply, reference, sensor, and outputs. |
| VREF | 1.250V bandgap reference output | Must source 50 µA load to maintain ±1% accuracy; sets VT1/VT2 divider points. |
| VTEMP | Temperature sensor analog output | Linear +6.20 mV/°C + 395 mV; max 1500 Ω output impedance. |
| OUT1 | Active-low digital output #1 | Open-collector; goes LOW above T1, HIGH below (T1 – 5°C); not for direct fan drive. |
| OUT2 | Active-low digital output #2 | Open-collector; goes LOW above T2, HIGH below (T2 – 5°C); independent of OUT1. |
| VT1 | Comparator #1 threshold input | Accepts voltage divider output defining first trip point (e.g., 82°C = ~0.903V). |
| VT2 | Comparator #2 threshold input | Accepts voltage divider output defining second trip point (e.g., 75°C = ~0.842V). |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent thermal thresholds | Enables separate overtemperature alarm and cooling activation (e.g., fan ON/OFF hysteresis). |
| Internal 1.250V ±1% reference | Eliminates need for external reference; ensures consistent VT1/VT2 scaling across temperature and supply. |
| Low 230 µA supply current | Extends battery life in portable 3.0V/5V systems such as handheld instruments or IoT edge sensors. |
| −40°C to +125°C operating range | Validated performance across automotive under-hood, industrial PLC, and HVAC controller environments. |
| VSSOP-8 footprint | 3.0 mm × 3.0 mm size saves PCB area vs. SOIC-8; compatible with standard reflow profiles (MSL 1). |
Applications
| Microprocessor Thermal Management | Fan Control |
|---|---|
Use Scenario: Monitoring CPU die temperature in embedded computing modules to prevent thermal throttling or shutdown. IC Role / Device Role / Timing Role: Dual-threshold thermostat providing independent high-temp alert (OUT1) and active cooling enable (OUT2) signals. Use Value: Enables precise 5°C hysteresis between fan activation (e.g., 80°C) and deactivation (75°C), reducing acoustic noise and power cycling stress. |
Use Scenario: Regulating airflow in industrial motor drives where heatsink temperature must stay within safe limits. IC Role / Device Role / Timing Role: Direct interface between heatsink-mounted sensor and fan driver circuitry via open-collector outputs. 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 single-cell Li-ion batteries (3.0V–4.2V). IC Role / Device Role / Timing Role: Low-quiescent-current thermal watchdog that triggers shutdown before battery or sensor damage occurs. Use Value: 230 µA max supply current preserves battery runtime; wide 2.7V–10V range accommodates battery discharge curve. |
Use Scenario: Monitoring cabinet temperature in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Standalone thermal supervisor interfacing with relay drivers or PLC input modules. Use Value: −40°C to +125°C rating ensures reliability in unconditioned enclosures; VSSOP-8 eases layout in space-constrained DIN-rail mounts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-threshold thermal protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2995IMS8#TRPBF | Single-threshold, I²C digital output; no internal sensor; requires external thermistor or diode. | Requires microcontroller interface and calibration; lacks analog VTEMP output for diagnostics. | Choose when digital bus integration and remote sensing are prioritized over simplicity and analog visibility. |
| MAX6505ESA+ | Single-output, ±3°C accuracy over −40°C to +125°C; SO-8 only; no VREF output. | Cannot implement dual hysteresis without external components; limited configurability. | Choose for cost-sensitive single-alarm applications where board space and feature count are secondary. |
Compared with LTC2995IMS8#TRPBF and MAX6505ESA+, the LM56CIMM uniquely combines dual independent thresholds, integrated temperature sensing, analog VTEMP output, and a precision internal reference - making it optimal for self-contained, microcontroller-free thermal control loops requiring deterministic timing and minimal external components.
Availability
LM56CIMM 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 across extended temperature ranges.
Supply support for LM56CIMM 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 connectivity technologies, with decades of expertise in precision analog IC design and industrial-grade reliability.
The LM56 product line was designed specifically for low-power, dual-threshold thermal supervision in resource-constrained systems - emphasizing accuracy, simplicity, and robustness across harsh environmental conditions.
FAQ
What is the operating temperature range for the LM56CIMM?
The LM56CIMM is rated for continuous operation from −40°C to +125°C, matching the LM56CIM grade specification. This range is validated per TI's SNIS120G datasheet and applies to all electrical characteristics including trip-point accuracy (±4°C max over full range), supply current, and VREF stability. The VSSOP-8 package supports this rating with appropriate PCB thermal design.
How do I configure the two temperature trip points (T1 and T2) on the LM56CIMM?
Configure T1 and T2 using three external resistors (R1, R2, R3) forming voltage dividers from the LM56CIMM's 1.250V VREF pin to GND. VT1 = 1.250V × R1/(R1+R2+R3); VT2 = 1.250V × (R1+R2)/(R1+R2+R3). With total resistance fixed at 27 kΩ, resistor values are calculated directly from desired trip voltages - which map to temperature via VTEMP = 6.20 mV/°C × T + 395 mV.
Does the LM56CIMM require external components to function?
Yes - the LM56CIMM requires three external resistors to set VT1 and VT2 trip voltages, a 0.1 µF bypass capacitor on V+, and pull-up resistors on OUT1 and OUT2 (open-collector outputs). No external sensor is needed: the internal temperature sensor and 1.250V reference are fully integrated. VREF must source a 50 µA load for guaranteed accuracy.
What is the accuracy of the LM56CIMM's temperature sensing over its full operating range?
For the LM56CIMM (LM56CIM grade), trip point accuracy is ±4°C maximum over −40°C to +125°C, inclusive of VREF error, comparator offset, and temperature sensitivity errors. At +25°C, accuracy is ±3°C max; from +25°C to +85°C, it remains ±3°C max. This is distinct from the tighter ±2°C spec of the LM56BIM grade.
Can the LM56CIMM directly drive a cooling fan?
No - the LM56CIMM's OUT1 and OUT2 are open-collector outputs rated for ≤50 µA sink current and 0.4V max low-level voltage at 50 µA. They are not designed to drive fan motors directly. Instead, they interface with external driver transistors, MOSFETs, or fan controller ICs. TI's datasheet explicitly states these outputs "are not intended to directly drive a fan motor."
LM56CIMM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
LM56CIMM FAQ
1.How can I place an order for LM56CIMM through Aetrix?
Please submit a Request for Quotation (RFQ) for LM56CIMM 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 reliable?
The price and inventory of LM56CIMM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM56CIMM is usually 5 days.
3.What payment methods are accepted for LM56CIMM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM56CIMM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM56CIMM?
LM56CIMM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM56CIMM 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?
For technical support, including LM56CIMM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM56CIMM requirements.
6.How does Aetrix verify that LM56CIMM is sourced from the original manufacturer or authorized distributors?
All LM56CIMM 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 meets industry standards.
7.What is the process for return or replacement of LM56CIMM?
All LM56CIMM units undergo pre-shipment inspection (PSI). If there is an issue with LM56CIMM, 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 part is unused and in its original packaging.
Return procedure for LM56CIMM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM56CIMM Tags
-
MCP9700T-E/TT
Microchip Technology
-
MCP9700T-E/LT
Microchip Technology
-
MCP9701T-E/TT
Microchip Technology
-
MCP9701T-E/LT
Microchip Technology
-
TMP235A4DBZR
Texas Instruments
-
MCP9700AT-E/TT
Microchip Technology
-
MCP9700AT-E/LT
Microchip Technology
-
MCP9701AT-E/LT
Microchip Technology
-
MCP9701AT-E/TT
Microchip Technology
,TO-226_straightlead.jpg)
-
LM335Z
STMicroelectronics
-
TMP1075NDRLR
Texas Instruments
-
TMP1075DGKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
