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Texas Instruments LM26CIM5-SPA/NOPB
- Part No.:
- LM26CIM5-SPA/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM26CIM5-SPA/NOPB.pdf
- Description:
- THERMOSTAT 75DEGC ACT LO SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:11,419
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Product details
Overview
LM26CIM5-SPA/NOPB from Texas Instruments is a factory-preset, ±3°C accurate digital-output thermostat with fixed 70°C overtemperature shutdown trip point, open-drain active-low OS output, and programmable 2°C/10°C hysteresis via HYST pin. It integrates temperature sensor, reference, DAC, and comparator in a single SOT-23-5 package and operates from 2.7 V to 5.5 V supply. Used for microprocessor thermal shutdown and fan control in portable systems.
For engineers reviewing the LM26CIM5-SPA/NOPB datasheet, LM26CIM5-SPA/NOPB pinout, LM26CIM5-SPA/NOPB application, or LM26CIM5-SPA/NOPB equivalent, key selection criteria include trip point accuracy (±3°C), hysteresis configuration (HYST pin logic level), VTEMP analog output slope (−10.82 mV/°C), supply current (16 µA typical), and open-drain OS drive capability with ≥10 kΩ pullup.
Technical Context
The LM26CIM5-SPA/NOPB implements a precision analog temperature sensing front-end feeding an internal comparator with factory-trimmed trip threshold (70°C) and selectable hysteresis (2°C or 10°C). Its VTEMP pin delivers a nonlinear voltage output defined by VO = (−3.479 × 10⁻⁶ × (T − 30)²) + (−1.082 × 10⁻² × (T − 30)) + 1.8015 V, enabling post-assembly calibration verification.
Digital functionality is fixed per part number: LM26CIM5-SPA/NOPB is configured as OS (overtemperature shutdown), active-low, open-drain output only - no US or push-pull variants. The HYST input determines hysteresis magnitude (GND = 10°C, V+ = 2°C), and GND pin serves as both power return and thermal reference plane via die backside attachment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Trip Point | 70°C fixed factory preset; triggers OS low when die temperature exceeds 70°C |
| Accuracy | ±3°C over −55°C to +110°C; includes sensor, reference, DAC, and comparator errors |
| Hysteresis | 2°C (HYST = V+) or 10°C (HYST = GND); prevents output chatter near trip point |
| VTEMP Slope | −10.82 mV/°C nominal; enables external ADC-based temperature readback and board-level functional test |
| Supply Current | 16 µA typical at 25°C; supports ultra-low-power battery-operated thermal monitoring |
| Supply Range | 2.7 V to 5.5 V; compatible with 3.3 V and 5 V system rails without regulation |
| Output Type | Open-drain OS, active-low; requires external pullup ≥10 kΩ for interrupt or power-control signaling |
Pinout & Package
LM26CIM5-SPA/NOPB is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, with GND (pin 2) thermally connected to the die backside for accurate lead-temperature coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - HYST | Digital input | Selects hysteresis: GND = 10°C, V+ = 2°C; VIH ≥ 0.8×V+, VIL ≤ 0.2×V+ |
| 2 - GND | Power ground & thermal reference | Connected to die backside; must be tied to system ground and large copper pour for thermal stability |
| 3 - VTEMP | Analog output | Temperature-proportional voltage; weak drive (1 µA source / 40 µA sink); requires high-Z load or series R for capacitive loads |
| 4 - V+ | Power supply | 2.7 V–5.5 V input; requires 0.1 µF bypass capacitor close to pin |
| 5 - OS | Digital output | Open-drain, active-low overtemperature shutdown signal; sinks current when T ≥ 70°C |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed trip point | 70°C setpoint with ±3°C accuracy across −55°C to +110°C, eliminating external calibration components |
| Programmable hysteresis | 2°C or 10°C via single HYST pin logic level - no external resistors or configuration registers needed |
| VTEMP analog output | Enables post-assembly PCB testing by forcing VTEMP to verify comparator and OS functionality without thermal chamber |
| No external components required | Operates standalone with only V+ bypass cap; eliminates BOM cost and layout area vs discrete thermostats |
| UL recognition | Meets UL 1577 requirements for reinforced insulation, supporting safety-critical thermal protection in end equipment |
Applications
| Microprocessor Thermal Management | Fan Control |
|---|---|
Use Scenario: Monitors CPU die temperature in embedded controllers to prevent thermal throttling or lockup. IC Role / Device Role / Timing Role: Overtemperature shutdown sensor with 70°C trip point and open-drain OS output driving processor reset or PMIC enable. Use Value: Prevents silicon damage by asserting OS low within ±3°C of actual junction temperature, with 2°C hysteresis minimizing false triggers during transient spikes. | Use Scenario: Controls two-speed cooling fan in industrial gateway devices based on enclosure temperature. IC Role / Device Role / Timing Role: Thermostat triggering fan high-speed mode at 70°C using OS output to switch N-channel MOSFET gate. Use Value: Enables simple, reliable fan staging without microcontroller firmware - OS drives gate directly with <1 µA quiescent current draw. |
| Portable Battery-Powered Systems | Electronic System Protection |
Use Scenario: Safeguards Li-ion battery pack during fast charging in handheld medical instruments. IC Role / Device Role / Timing Role: Monitors charger IC temperature; OS output disables charging path via load switch when >70°C. Use Value: Adds fail-safe thermal cutoff independent of host MCU, drawing only 16 µA to extend battery runtime between charges. | Use Scenario: Protects power supply modules in telecom base stations from overheating due to airflow blockage. IC Role / Device Role / Timing Role: Detects heatsink temperature rise; OS signal initiates graceful shutdown sequence before critical failure. Use Value: Provides deterministic 70°C trip with ±3°C accuracy and 10°C hysteresis (HYST=GND) to avoid nuisance trips during ambient fluctuations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermostat applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM26CIM5-RPA/NOPB | Fixed 65°C trip point; identical pinout, package, and electrical specs | Suitable where lower thermal margin is acceptable (e.g., lower-power SoCs) | Select when system thermal budget requires earlier shutdown than 70°C |
| LM26CIM5-TPA/NOPB | Fixed 85°C trip point; same SOT-23-5 footprint and OS/open-drain behavior | Used in higher-thermal-mass systems (e.g., motor drives) needing later intervention | Choose when ambient or heatsink thermal inertia delays temperature rise to critical levels |
Compared with LM26CIM5-RPA/NOPB and LM26CIM5-TPA/NOPB, the LM26CIM5-SPA/NOPB provides a mid-range 70°C trip optimized for general-purpose microprocessor and power stage thermal management - balancing early warning against false positives in dynamically loaded systems.
Availability
LM26CIM5-SPA/NOPB is available at Aetrix Electronics and suitable for microprocessor thermal management, fan control, and portable battery-powered systems requiring stable component supply and long-term lifecycle support.
Supply support for LM26CIM5-SPA/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 and embedded processing chips for industrial, automotive, and consumer applications.
The LM26 series is a family of factory-programmable thermostats targeting board-level thermal protection with integrated sensing, reference, and digital output - designed for simplicity, accuracy, and reliability in space-constrained systems.
FAQ
What is the exact trip temperature and accuracy of the LM26CIM5-SPA/NOPB?
The LM26CIM5-SPA/NOPB has a factory-preset trip point of 70°C with total accuracy of ±3°C over the −55°C to +110°C operating range. This specification includes contributions from the internal temperature sensor, voltage reference, DAC, and comparator offset errors. Accuracy degrades to ±4°C at 120°C, per TI's SNIS115S datasheet Section 7.5.
How does the HYST pin affect hysteresis behavior in the LM26CIM5-SPA/NOPB?
The HYST pin on the LM26CIM5-SPA/NOPB selects between two hysteresis values: connecting HYST to GND sets 10°C hysteresis, while connecting it to V+ sets 2°C hysteresis. This changes the temperature delta between OS activation and deactivation - e.g., at 70°C trip with 10°C hysteresis, OS goes low at 70°C and returns high only below 60°C. The pin accepts standard CMOS logic levels (VIH ≥ 0.8×V+, VIL ≤ 0.2×V+).
Can the LM26CIM5-SPA/NOPB be used for undertemperature detection?
No, the LM26CIM5-SPA/NOPB is factory-configured exclusively for overtemperature shutdown (OS) with active-low open-drain output. It does not support undertemperature (US) functionality or push-pull output modes. For undertemperature detection, alternate part numbers such as LM26CIM5-HHD/NOPB (0°C US) or LM26CIM5-BPB/NOPB (−45°C US) must be selected - these share the same SOT-23-5 package but differ in trip point and output logic.
What is the purpose and drive capability of the VTEMP pin on the LM26CIM5-SPA/NOPB?
The VTEMP pin on the LM26CIM5-SPA/NOPB provides an analog voltage proportional to die temperature, defined by VO = (−3.479 × 10⁻⁶ × (T − 30)²) + (−1.082 × 10⁻² × (T − 30)) + 1.8015 V. It has very limited drive strength: ≤1 µA source, ≤40 µA sink. This allows use with high-impedance ADC inputs or for after-assembly functional testing - but requires series resistance if driving capacitive loads (>100 pF) to prevent oscillation.
Is the LM26CIM5-SPA/NOPB RoHS-compliant and UL-recognized?
Yes, the LM26CIM5-SPA/NOPB is RoHS-compliant (lead-free, halogen-free) and UL Recognized under Component Recognition Service (File E169910), meeting UL 1577 for reinforced insulation. This certification validates its suitability in safety-critical thermal protection circuits where isolation integrity is mandated, such as industrial power supplies and medical equipment.
LM26CIM5-SPA/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:
- Hot
- Switching Temperature:
- 70°C
- Accuracy:
- ±3°C
- Current - Output (Max):
- -
- Output Type:
- Open Drain
- Output:
- Active Low
- Output Function:
- /OverTemp
- 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-SPA/NOPB FAQ
1.How can I place an order for LM26CIM5-SPA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26CIM5-SPA/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-SPA/NOPB reliable?
The price and inventory of LM26CIM5-SPA/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-SPA/NOPB is usually 5 days.
3.What payment methods are accepted for LM26CIM5-SPA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26CIM5-SPA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26CIM5-SPA/NOPB?
LM26CIM5-SPA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26CIM5-SPA/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-SPA/NOPB?
For technical support, including LM26CIM5-SPA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26CIM5-SPA/NOPB requirements.
6.How does Aetrix verify that LM26CIM5-SPA/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26CIM5-SPA/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-SPA/NOPB meets industry standards.
7.What is the process for return or replacement of LM26CIM5-SPA/NOPB?
All LM26CIM5-SPA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26CIM5-SPA/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-SPA/NOPB part is unused and in its original packaging.
Return procedure for LM26CIM5-SPA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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