My Inquiry
My Account
Texas Instruments LM56BIM
- Part No.:
- LM56BIM
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM56BIM.pdf
- Description:
- SENSOR ANALOG -40C-125C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:359
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM56BIM from Texas Instruments is a precision dual-output low-power thermostat IC with internal temperature sensing, two open-collector digital outputs (OUT1/OUT2), ±3°C trip point accuracy over −40°C to +125°C, 1.250V ±1% internal voltage reference, and 5°C typical hysteresis. It enables independent high- and low-temperature monitoring in microprocessor thermal management systems.
For engineers reviewing the LM56BIM datasheet, LM56BIM pinout, LM56BIM application, or LM56BIM equivalent, this page delivers verified technical context, package-specific pin functions, real-world thermal trip design constraints, and validated alternative options for industrial and embedded thermal protection circuits.
Technical Context
The LM56BIM integrates an internal bandgap voltage reference (1.250V), two precision comparators with built-in 5°C hysteresis, and a linear temperature sensor output (6.20 mV/°C) referenced to 395 mV at 0°C. Trip points VT1 and VT2 are set externally via three resistors dividing VREF, enabling user-defined thresholds.
Its dual open-collector outputs drive external logic or interface circuitry directly-OUT1 asserts LOW above T1 and releases HIGH below (T1 − 5°C); OUT2 behaves identically relative to T2. The device operates from 2.7V to 10V with only 230 μA max supply current, supporting battery-powered and low-quiescent systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V–10V - supports both 3.0V and 5V systems without level-shifting |
| Supply Current | 230 μA (max) - enables multi-year operation on coin-cell batteries |
| VREF Output | 1.250V ±1% - stable reference for accurate resistor-based trip point setting |
| Temp Sensor Sensitivity | +6.20 mV/°C - linear analog output used to calculate absolute temperature or calibrate VT1/VT2 |
| Tripoint Accuracy | ±3°C (−40°C to +125°C) - guaranteed worst-case error across full industrial operating range |
| Hysteresis | 5°C typical - prevents output oscillation near trip thresholds under slow thermal transients |
| Output Type | Open-collector (OUT1/OUT2) - allows wired-OR logic, pull-up to any compatible voltage rail ≤10V |
Pinout & Package
LM56BIM is packaged 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 gull-wing leads and standard 1.27 mm pitch.
| 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 |
| GND | Ground reference | Common return for all internal circuits and external resistor network |
| VREF | 1.250V bandgap reference output | Must source 50 µA load to maintain ±1% accuracy; drives external resistor divider |
| VTEMP | Temperature sensor analog output | Outputs (6.20 mV/°C × T) + 395 mV; 1500 Ω max output impedance |
| OUT1 | Digital output 1 (active LOW) | Goes LOW when temperature > T1; HIGH when < (T1 − 5°C); open-collector, ≤0.4V @ 50 µA sink |
| OUT2 | Digital output 2 (active LOW) | Goes LOW when temperature > T2; HIGH when < (T2 − 5°C); open-collector, ≤0.4V @ 50 µA sink |
| VT1 | Trip point 1 input | Comparator input for OUT1; voltage set by R1/(R1+R2+R3) × VREF |
| VT2 | Trip point 2 input | Comparator input for OUT2; voltage set by (R1+R2)/(R1+R2+R3) × VREF |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent trip points | Enables high-temp shutdown AND low-temp warning (e.g., fan ON/OFF hysteresis control) |
| Internal 1.250V reference | Eliminates need for external reference; ±1% tolerance ensures consistent VT1/VT2 scaling |
| 5°C internal hysteresis | Prevents chatter during slow thermal transitions without external RC components |
| 230 μA max quiescent current | Supports always-on thermal monitoring in portable 3V systems with minimal battery drain |
| −40°C to +125°C operation | Validated performance across full industrial temperature range without derating |
Applications
| Microprocessor Thermal Management | Fan Control |
|---|---|
|
Use Scenario: Monitoring CPU die temperature via PCB-mounted LM56BIM adjacent to processor package. IC Role / Device Role / Timing Role: Dual-output thermostat providing independent overtemp alert (OUT1) and throttling enable (OUT2) signals. Use Value: Enables precise 5°C hysteresis between fan activation (T2) and processor shutdown (T1), reducing thermal cycling stress. |
Use Scenario: Controlling cooling fan speed staging in HVAC controller based on heatsink temperature. IC Role / Device Role / Timing Role: Temperature-sensing comparator generating logic-level fan ON/OFF commands. Use Value: Eliminates need for microcontroller polling; direct hardware-driven response with <10 ms latency. |
| Industrial Process Control | Electronic System Protection |
|
Use Scenario: Monitoring ambient cabinet temperature in programmable logic controller (PLC) enclosure. IC Role / Device Role / Timing Role: Standalone thermal watchdog asserting fault signal if enclosure exceeds safe operating limit. Use Value: Provides fail-safe shutdown path independent of main controller firmware integrity. |
Use Scenario: Preventing lithium-ion battery pack overcharge/overdischarge due to thermal runaway. IC Role / Device Role / Timing Role: Dual-threshold sensor triggering charge cutoff (OUT1) and system disable (OUT2) at escalating temperatures. Use Value: Meets IEC 62133 thermal safety requirements with deterministic, analog-hardened response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output thermostat applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM56CIM | ±4°C trip accuracy over −40°C to +125°C (vs. ±3°C for LM56BIM); otherwise identical architecture and pinout | Suitable where wider thermal tolerance is acceptable, e.g., non-critical appliance monitoring | Select LM56CIM only if ±4°C error budget suffices; LM56BIM preferred for precision industrial use. |
| MAX6505 | Single-output, 3-pin SOT23 package; ±3°C accuracy; no VREF or VTEMP pins; fixed 125°C trip | Limited to single-threshold detection; no user-configurable VT1/VT2 or analog temperature readback | Choose MAX6505 only for space-constrained, single-point overtemp cutoff; LM56BIM required for dual thresholds or calibration. |
Compared with LM56CIM, LM56BIM offers tighter trip accuracy (±3°C vs. ±4°C) for critical thermal margins; compared with MAX6505, it provides dual outputs, external trip programming, and analog temperature telemetry-making LM56BIM uniquely suited for adaptive thermal management systems.
Availability
LM56BIM is available at Aetrix Electronics and suitable for microprocessor thermal management, fan control, industrial process control, and electronic system protection requiring stable component supply across extended temperature ranges.
Supply support for LM56BIM 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 product line was designed specifically for low-power, dual-threshold thermal monitoring in embedded systems-emphasizing accuracy, simplicity, and robustness across harsh industrial environments.
FAQ
What is the operating temperature range of the LM56BIM?
The LM56BIM is specified to operate from −40°C to +125°C. Its trip point accuracy is guaranteed at ±3°C across this entire range, making it suitable for demanding industrial and automotive under-hood applications where ambient conditions vary widely. This rating is confirmed in the Electrical Characteristics table and Operating Ratings section of the official TI datasheet SNIS120G.
How are the trip points VT1 and VT2 set on the LM56BIM?
VT1 and VT2 are set externally using three resistors (R1, R2, R3) that divide the internal 1.250V reference (VREF). VT1 = 1.250V × R1/(R1+R2+R3); VT2 = 1.250V × (R1+R2)/(R1+R2+R3). The sum R1+R2+R3 is recommended at 27 kΩ to minimize bias current error. These equations are explicitly defined in the LM56BIM functional description and typical application diagrams.
Does the LM56BIM require external components to function?
Yes-the LM56BIM 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 (since they are open-collector). No external hysteresis components are needed, as 5°C hysteresis is built-in. These requirements are documented in the Pin Functions and Typical Application sections of the LM56BIM datasheet.
Can the LM56BIM directly drive a cooling fan?
No-the LM56BIM's OUT1 and OUT2 outputs are open-collector with 50 µA sink capability and 0.4V max saturation voltage at 50 µA. They cannot drive fan motors directly. Instead, they must interface with external driver circuitry (e.g., MOSFET gate driver or transistor switch) as shown in Figure 18 of the LM56BIM datasheet for audio amplifier overtemperature protection.
What is the purpose of the VTEMP pin on the LM56BIM?
The VTEMP pin outputs an analog voltage proportional to die temperature: VTEMP = (6.20 mV/°C × T) + 395 mV. This allows users to read absolute temperature digitally (via ADC) or verify trip point calibration. Its 1500 Ω output impedance and linearity are characterized across −40°C to +125°C, and it is explicitly described in the Functional Description and Electrical Characteristics tables of the LM56BIM datasheet.
LM56BIM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Not For New Designs
- 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 FAQ
1.How can I place an order for LM56BIM through Aetrix?
Please submit a Request for Quotation (RFQ) for LM56BIM 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 reliable?
The price and inventory of LM56BIM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM56BIM is usually 5 days.
3.What payment methods are accepted for LM56BIM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM56BIM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM56BIM?
LM56BIM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM56BIM 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?
For technical support, including LM56BIM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM56BIM requirements.
6.How does Aetrix verify that LM56BIM is sourced from the original manufacturer or authorized distributors?
All LM56BIM 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 meets industry standards.
7.What is the process for return or replacement of LM56BIM?
All LM56BIM units undergo pre-shipment inspection (PSI). If there is an issue with LM56BIM, 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 part is unused and in its original packaging.
Return procedure for LM56BIM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM56BIM 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…
