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Texas Instruments LM26CIM5-HHD/NOPB
- Part No.:
- LM26CIM5-HHD/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM26CIM5-HHD/NOPB.pdf
- Description:
- THERMOSTAT 0DEGC ACT HI SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:904
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Product details
Overview
LM26CIM5-HHD/NOPB from Texas Instruments is a factory-preset, ±3°C accurate undertemperature shutdown thermostat in SOT-23-5 package with active-high push-pull digital output, 0°C trip point (TUS), and programmable 2°C/10°C hysteresis via HYST pin. It integrates temperature sensor, reference, DAC, and comparator for standalone thermal protection in battery-powered systems and industrial controls.
For engineers reviewing the LM26CIM5-HHD/NOPB datasheet, LM26CIM5-HHD/NOPB pinout, LM26CIM5-HHD/NOPB application, or LM26CIM5-HHD/NOPB equivalent, key selection criteria include trip point accuracy (±3°C), VTEMP analog output slope (−10.82 mV/°C), supply current (16 µA typical), hysteresis configuration (HYST = V+ → 2°C), and push-pull output drive capability (0.8×V+ min high-level voltage).
Technical Context
The LM26CIM5-HHD/NOPB implements an internal NTC temperature sensor with polynomial VTEMP output equation: VTEMP = (−3.479×10⁻⁶×(T−30)²) + (−1.082×10⁻²×(T−30)) + 1.8015 V. Its comparator compares this against a DAC-set reference to trigger US (undertemperature shutdown) at 0°C.
Pin 5 is factory-programmed as active-high push-pull US output - it drives HIGH when die temperature falls below 0°C and LOW when temperature rises above (0°C + THYST). Hysteresis is selected digitally: HYST = V+ yields 2°C, HYST = GND yields 10°C - preventing output oscillation near threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Trip Point | 0°C undertemperature shutdown (TUS), factory-preset, ±3°C accuracy over −55°C to +110°C |
| Output Type | Active-high push-pull US output - no external pullup required; drives ≥0.8×V+ at 500 µA source |
| Hysteresis | Selectable 2°C (HYST = V+) or 10°C (HYST = GND); prevents chatter during slow temperature transitions |
| VTEMP Output | Analog voltage proportional to die temperature; −10.82 mV/°C slope; enables post-assembly calibration and system-level temperature monitoring |
| Supply Range | 2.7 V to 5.5 V; 16 µA typical quiescent current - suitable for always-on battery monitoring |
| Package | SOT-23-5 (DBV), 2.90 mm × 1.60 mm body; GND pin (Pin 2) thermally connected to die backside for accurate lead-temperature coupling |
Pinout & Package
SOT-23-5 (DBV) package with exposed thermal pad not electrically connected; Pin 2 (GND) provides primary thermal path from die to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - HYST | Digital input | Hysteresis select: logic HIGH (V+) → 2°C; logic LOW (GND) → 10°C; input leakage <10 µA |
| 2 - GND | Power ground | Die backside connected directly to lead frame; primary thermal conduction path to PCB |
| 3 - VTEMP | Analog output | Temperature-proportional voltage; weak drive (1 µA source / 40 µA sink); requires high-Z ADC or series resistor for capacitive loads |
| 4 - V+ | Power supply | 2.7–5.5 V input; bypass with 0.1 µF capacitor; excellent noise rejection (200 mVp-p up to 1 MHz) |
| 5 - US | Digital output | Factory-programmed active-high push-pull undertemperature shutdown; drives HIGH ≤0°C, LOW > (0°C + THYST) |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Self-contained thermostat: integrated sensor, reference, DAC, comparator, and output driver eliminate discrete BOM |
| VTEMP analog output | Enables after-assembly functional test by forcing VTEMP to verify US output state transition - no thermal chamber needed |
| Programmable hysteresis | Two-point hysteresis selection (2°C or 10°C) via single digital input eliminates need for external resistors or timing networks |
| Push-pull US output | Active-high logic compatible with microcontroller GPIOs without pullup resistors - reduces board space and power loss |
| ±3°C trip accuracy | Guaranteed over full operating range (−55°C to +110°C), enabling reliable cold-start detection in automotive and industrial environments |
Applications
| Microprocessor Cold-Start Protection | Fan Control in HVAC Systems |
|---|---|
Use Scenario: Prevents CPU operation below minimum junction temperature during cold ambient startup. IC Role / Device Role / Timing Role: Undertemperature shutdown monitor asserting active-high US signal to processor reset controller. Use Value: Ensures silicon reliability by blocking execution until die reaches safe operating temperature (0°C), avoiding parametric shift in low-VGS MOSFETs and PLL lock failure. | Use Scenario: Activates auxiliary heating element or disables cooling fan when ambient drops below freezing in ducted HVAC units. IC Role / Device Role / Timing Role: Cold-sensing thermostat driving relay control logic via US output. Use Value: Eliminates condensation-induced corrosion and coil freeze damage by maintaining minimum air-handling temperature - no external thermistor or ADC required. |
| Portable Medical Device Battery Monitoring | Industrial PLC I/O Module Thermal Safety |
Use Scenario: Monitors lithium-ion battery pack temperature during charging in sub-zero field conditions. IC Role / Device Role / Timing Role: Undertemperature cutoff switch halting charge current when cell temperature falls below 0°C. Use Value: Prevents copper plating and capacity loss by enforcing JEITA-compliant charging limits - VTEMP output allows host MCU to log temperature history without additional sensing circuitry. | Use Scenario: Detects abnormal cabinet cooling in outdoor-rated programmable logic controllers operating in arctic climates. IC Role / Device Role / Timing Role: Standalone cold-sense node triggering watchdog timeout or alarm relay when enclosure temperature drops below operational threshold. Use Value: Maintains deterministic I/O timing by ensuring FPGA and analog front-end remain within spec; ±3°C accuracy avoids false trips from thermal gradients across DIN-rail mounted chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar undertemperature shutdown applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM26CIM5-BPB | −45°C trip point, active-low open-drain US output, same 2.7–5.5 V supply and ±3°C accuracy | Designed for deep-cold industrial storage monitoring; requires external pullup and level-shifting for active-high MCU interfaces | Select when lower trip point is required and system design accommodates open-drain signaling. |
| MAX6505UTA+T | 0°C trip, active-low open-drain output, 1.7–5.5 V supply, ±2°C accuracy, SOT-23-5 package | Lacks VTEMP analog output; no hysteresis programming - fixed 2°C hysteresis; higher supply current (25 µA typical) | Choose when minimal footprint and tighter trip accuracy are prioritized over diagnostic capability and hysteresis flexibility. |
Compared with LM26CIM5-BPB and MAX6505UTA+T, the LM26CIM5-HHD/NOPB uniquely delivers active-high push-pull output at 0°C with programmable hysteresis and integrated VTEMP diagnostics - reducing component count and enabling in-system calibration without sacrificing accuracy or thermal response.
Availability
LM26CIM5-HHD/NOPB is available at Aetrix Electronics and suitable for microprocessor cold-start protection, HVAC fan control, portable medical device battery monitoring, and industrial PLC I/O module thermal safety requiring stable component supply and long-term lifecycle support.
Supply support for LM26CIM5-HHD/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 company designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer applications.
The LM26 product line delivers factory-programmable thermostats with integrated temperature sensing and digital outputs for reliable, low-power thermal management in space-constrained systems.
FAQ
What is the exact trip point and hysteresis behavior of the LM26CIM5-HHD/NOPB?
The LM26CIM5-HHD/NOPB is factory-programmed for 0°C undertemperature shutdown (TUS). Its hysteresis is user-selectable: connecting HYST to V+ sets THYST = 2°C, so US goes HIGH at 0°C and returns LOW only when temperature rises above +2°C; connecting HYST to GND sets THYST = 10°C, so US returns LOW only above +10°C. This behavior is confirmed in TI's SNIS115S datasheet Section 7.5 and Figure 5.
Does the LM26CIM5-HHD/NOPB require external components to operate?
No, the LM26CIM5-HHD/NOPB operates autonomously with only a 0.1 µF bypass capacitor on V+. It contains an integrated temperature sensor, voltage reference, DAC, comparator, and push-pull output driver. No external resistors, thermistors, or op-amps are needed - verified in the "No External Components Required" feature (Section 1) and Typical Application schematics (Figures 10–13) of the LM26 datasheet.
How is the VTEMP pin used in system-level testing for the LM26CIM5-HHD/NOPB?
The VTEMP pin enables after-assembly PCB testing of the LM26CIM5-HHD/NOPB by allowing direct voltage injection to force US output state changes. For example, grounding VTEMP while monitoring US verifies comparator and output stage functionality without thermal cycling. This procedure is documented in Section 8.4.1 of the SNIS115S datasheet and supports production test efficiency and field-repair validation.
What is the supply current consumption of the LM26CIM5-HHD/NOPB across temperature and voltage?
The LM26CIM5-HHD/NOPB draws 16 µA typical and 40 µA maximum supply current over the full operating range (−55°C to +125°C) and supply voltage (2.7 V to 5.5 V), per Electrical Characteristics Table 7.5 in SNIS115S. This ultra-low quiescent current enables multi-year battery life in always-on cold-monitoring applications such as remote environmental sensors.
Can the LM26CIM5-HHD/NOPB be used for overtemperature detection?
No - the LM26CIM5-HHD/NOPB is factory-configured exclusively for undertemperature shutdown (US) at 0°C. It does not support overtemperature (OS) functionality. Other variants like LM26CIM5-TPA (85°C OS) or LM26CIM5-RPA (65°C OS) provide overtemperature detection, but LM26CIM5-HHD/NOPB's output logic, trip point, and internal DAC setting are permanently fixed for US operation as specified in the Device Comparison Table (Section 5) of SNIS115S.
LM26CIM5-HHD/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Trip Temperature Threshold:
- Cold
- Switching Temperature:
- 0°C
- Accuracy:
- ±3°C
- Current - Output (Max):
- -
- Output Type:
- Push-Pull
- Output:
- Active High
- Output Function:
- UnderTemp
- Selectable Hysteresis:
- Yes
- Features:
- -
- Voltage - Supply:
- 2.7 V ~ 5.5 V
- Current - Supply:
- 16µA
- Operating Temperature:
- -55°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-23-5
LM26CIM5-HHD/NOPB FAQ
1.How can I place an order for LM26CIM5-HHD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26CIM5-HHD/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 LM26CIM5-HHD/NOPB reliable?
The price and inventory of LM26CIM5-HHD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM26CIM5-HHD/NOPB is usually 5 days.
3.What payment methods are accepted for LM26CIM5-HHD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26CIM5-HHD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26CIM5-HHD/NOPB?
LM26CIM5-HHD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26CIM5-HHD/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 LM26CIM5-HHD/NOPB?
For technical support, including LM26CIM5-HHD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26CIM5-HHD/NOPB requirements.
6.How does Aetrix verify that LM26CIM5-HHD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26CIM5-HHD/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 LM26CIM5-HHD/NOPB meets industry standards.
7.What is the process for return or replacement of LM26CIM5-HHD/NOPB?
All LM26CIM5-HHD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26CIM5-HHD/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 LM26CIM5-HHD/NOPB part is unused and in its original packaging.
Return procedure for LM26CIM5-HHD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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