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Texas Instruments LM26CIM5-TPA/NOPB
- Part No.:
- LM26CIM5-TPA/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM26CIM5-TPA/NOPB.pdf
- Description:
- THERMOSTAT 85DEGC ACT LO SOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM26CIM5-TPA/NOPB from Texas Instruments is a factory-preset, ±3°C accurate digital-output thermostat with fixed 85°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 5-pin SOT-23 package and supports microprocessor thermal shutdown applications requiring precise, self-contained temperature monitoring without external components.
For engineers reviewing the LM26CIM5-TPA/NOPB datasheet, LM26CIM5-TPA/NOPB pinout, LM26CIM5-TPA/NOPB application, or LM26CIM5-TPA/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 (GND = 10°C, V+ = 2°C), and open-drain OS output compatibility with 3.3 V/5 V logic systems.
Technical Context
The LM26CIM5-TPA/NOPB implements a monolithic temperature-sensing architecture with an internal NTC-based sensor feeding a precision comparator referenced to a factory-trimmed DAC. Its trip point is permanently set to 85°C during manufacturing and cannot be adjusted externally.
Digital output behavior is fixed as active-low open-drain OS (overtemperature shutdown), while hysteresis is dynamically selected by HYST pin voltage: GND yields 10°C hysteresis, V+ yields 2°C hysteresis. The VTEMP pin provides a calibrated analog voltage output governed by VO = (−3.479 × 10⁻⁶ × (T − 30)²) + (−1.082 × 10⁻² × (T − 30)) + 1.8015 V, enabling post-assembly verification and system-level temperature readback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Trip Point | Fixed at 85°C - triggers OS low when die temperature exceeds 85°C; used for thermal shutdown in CPUs, power stages, or battery packs. |
| Trip Accuracy | ±3°C over −55°C to +110°C - ensures reliable activation within defined thermal safety margin without calibration. |
| Hysteresis Options | 2°C (HYST = V+) or 10°C (HYST = GND) - prevents output oscillation near trip point; choice depends on system thermal noise and ramp rate. |
| VTEMP Slope | −10.82 mV/°C - enables direct temperature measurement using external ADC; supports after-assembly functional test without thermal chamber. |
| Supply Current | 16 µA typical - ultra-low quiescent draw suitable for always-on thermal monitoring in battery-powered systems. |
| Supply Voltage | 2.7 V to 5.5 V - compatible with single-cell Li-ion (3.0–4.2 V), 3.3 V logic rails, and 5 V legacy systems. |
| Output Type | Open-drain OS, active-low - requires external pull-up; interfaces directly with MCU interrupt pins or enable inputs of PMICs/fan drivers. |
Pinout & Package
LM26CIM5-TPA/NOPB is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, with pin 2 (GND) thermally connected to the die backside for accurate lead-temperature sensing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - HYST | Digital input | Selects hysteresis: GND = 10°C, V+ = 2°C; high-impedance input (<10 µA leakage); no external pull required. |
| 2 - GND | Power ground | Die thermal reference plane; must connect to system ground; determines sensed temperature via lead-frame conduction. |
| 3 - VTEMP | Analog output | Temperature-proportional voltage (−10.82 mV/°C); 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; requires 0.1 µF bypass capacitor close to pin; rejects >200 mVp-p noise up to 1 MHz. |
| 5 - OS | Digital output | Active-low open-drain overtemperature shutdown signal; sinks ≥1.2 mA at 0.4 V; needs ≥10 kΩ pull-up to V+ or logic rail. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-preset 85°C trip point | Eliminates need for external resistors or trimming; guarantees repeatable thermal shutdown threshold across production lots. |
| VTEMP analog output with equation | Enables real-time die temperature readback and post-assembly validation without thermal cycling; supports diagnostic firmware routines. |
| No external components required | Reduces BOM count and PCB area; simplifies layout and qualification for space-constrained embedded systems. |
| UL Recognized Component | Meets UL 60950-1 requirements for end-equipment safety certification; reduces compliance burden in industrial and consumer designs. |
| 2.7–5.5 V wide supply range | Supports direct connection to battery monitors, LDO outputs, or microcontroller I/O rails without level-shifting. |
Applications
| Microprocessor Thermal Management | Fan Control |
|---|---|
|
Use Scenario: Monitors CPU die temperature in laptops or edge compute modules to prevent thermal throttling or permanent damage. IC Role / Device Role / Timing Role: Digital thermostat providing active-low OS signal to processor's THERMTRIP# input or system PMIC enable pin. Use Value: Triggers immediate shutdown at precisely 85°C ±3°C, preventing junction temperatures exceeding safe operating limits under sustained load. |
Use Scenario: Controls two-speed DC fan in industrial power supplies based on heatsink temperature. IC Role / Device Role / Timing Role: Overtemperature switch driving fan enable line via MOSFET gate; hysteresis prevents fan chatter near threshold. Use Value: Enables simple, robust fan staging without microcontroller-OS low activates high-speed mode; 10°C hysteresis ensures stable transition. |
| Portable Battery-Powered Systems | Electronic System Protection |
|
Use Scenario: Protects Li-ion battery packs during fast charging by monitoring cell-can temperature. IC Role / Device Role / Timing Role: Trip-point sensor interfacing with battery protection IC or charger controller to disable charge path. Use Value: Ultra-low 16 µA supply current extends standby life; 85°C threshold aligns with common cell thermal cutoff specifications. |
Use Scenario: Safeguards FPGA or ASIC power delivery by disabling VRMs when VRM MOSFET temperature exceeds safe limit. IC Role / Device Role / Timing Role: Standalone thermal watchdog asserting OS to PMIC's EN pin or FPGA's POR circuit. Use Value: Provides fail-safe, hardware-level protection independent of firmware; open-drain output allows wired-OR with other fault signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermostat applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6505UTP+T | Fixed 85°C trip, push-pull active-high output, 2.7–5.5 V supply, ±3°C accuracy, SOT-23-5 | Requires logic inversion for MCU interrupt; no VTEMP output; lacks hysteresis programming pin | Choose when active-high signaling or elimination of external pull-up is preferred; not suitable for VTEMP-based diagnostics. |
| TC622EOA | Adjustable trip via resistor divider, open-drain active-low OS, 2.7–5.5 V, ±4°C accuracy, SOIC-8 | Larger footprint; requires external resistor network; no VTEMP output; fixed 10°C hysteresis | Choose when trip point flexibility (−40°C to +125°C) outweighs size and diagnostic capability constraints. |
Compared with LM26CIM5-TPA/NOPB, MAX6505UTP+T offers simpler interface but removes VTEMP-based validation and hysteresis control, while TC622EOA trades factory precision and compactness for field-adjustability and higher accuracy tolerance.
Availability
LM26CIM5-TPA/NOPB is available at Aetrix Electronics and suitable for microprocessor thermal management, fan control, and portable battery-powered systems requiring stable component supply, long-term lifecycle support, and guaranteed factory-trimmed accuracy.
Supply support for LM26CIM5-TPA/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 specializing in analog and embedded processing technologies, with leadership in precision analog, power management, and signal chain solutions.
The LM26 series was designed as a family of factory-programmable thermostats targeting cost-sensitive, space-constrained thermal protection applications where simplicity, reliability, and zero-calibration operation are critical.
FAQ
What is the exact trip temperature of the LM26CIM5-TPA/NOPB?
The LM26CIM5-TPA/NOPB has a factory-programmed trip point of exactly 85°C. This value is laser-trimmed during manufacturing and remains fixed across its operating temperature range of −55°C to +125°C. The device asserts its OS output low when the die temperature exceeds 85°C and releases it high when temperature falls below (85°C − THYST), where THYST is either 2°C or 10°C depending on the HYST pin state.
Can the LM26CIM5-TPA/NOPB be used for undertemperature detection?
No, the LM26CIM5-TPA/NOPB is configured exclusively for overtemperature shutdown (OS) with active-low open-drain output. It does not support undertemperature (US) functionality. Other variants in the LM26 family-such as LM26CIM5-HHD or LM26CIM5-BPB-are factory-programmed for US operation, but LM26CIM5-TPA/NOPB is fixed to OS mode per its part number suffix "TPA" and Device Comparison Table entry.
How does the VTEMP pin function in the LM26CIM5-TPA/NOPB?
The VTEMP pin on the LM26CIM5-TPA/NOPB delivers an analog voltage proportional to die temperature, following VO = (−3.479 × 10⁻⁶ × (T − 30)²) + (−1.082 × 10⁻² × (T − 30)) + 1.8015 V, with a nominal slope of −10.82 mV/°C. It supports post-assembly testing and real-time temperature monitoring but has limited drive strength (1 µA source / 40 µA sink), requiring high-impedance ADC input or series resistance for capacitive loads.
What hysteresis values are supported by the LM26CIM5-TPA/NOPB and how are they selected?
The LM26CIM5-TPA/NOPB supports two hysteresis values: 2°C and 10°C. These are selected solely by the voltage applied to the HYST pin: connecting HYST to V+ selects 2°C hysteresis, while connecting HYST to GND selects 10°C hysteresis. No external components are needed-the internal comparator automatically adjusts its reference offset based on this digital input state.
Is the LM26CIM5-TPA/NOPB RoHS compliant and lead-free?
Yes, the LM26CIM5-TPA/NOPB is RoHS compliant and lead-free. The "/NOPB" suffix explicitly denotes lead-free packaging per JEDEC J-STD-609, and the device meets TI's environmental compliance standards including exemption 7a for lead in high-melting-temperature solder alloys. Full material declarations and certificates are available through TI's Quality & Environmental Information portal.
LM26CIM5-TPA/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:
- 85°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-TPA/NOPB FAQ
1.How can I place an order for LM26CIM5-TPA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26CIM5-TPA/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-TPA/NOPB reliable?
The price and inventory of LM26CIM5-TPA/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-TPA/NOPB is usually 5 days.
3.What payment methods are accepted for LM26CIM5-TPA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26CIM5-TPA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26CIM5-TPA/NOPB?
LM26CIM5-TPA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26CIM5-TPA/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-TPA/NOPB?
For technical support, including LM26CIM5-TPA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26CIM5-TPA/NOPB requirements.
6.How does Aetrix verify that LM26CIM5-TPA/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26CIM5-TPA/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-TPA/NOPB meets industry standards.
7.What is the process for return or replacement of LM26CIM5-TPA/NOPB?
All LM26CIM5-TPA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26CIM5-TPA/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-TPA/NOPB part is unused and in its original packaging.
Return procedure for LM26CIM5-TPA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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