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Texas Instruments LM26CIM5X-TPA/NOPB
- Part No.:
- LM26CIM5X-TPA/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM26CIM5X-TPA/NOPB.pdf
- Description:
- THERMOSTAT 85DEGC ACT LO SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,165
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Product details
Overview
LM26CIM5X-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.
For engineers reviewing the LM26CIM5X-TPA/NOPB datasheet, LM26CIM5X-TPA/NOPB pinout, LM26CIM5X-TPA/NOPB application, or LM26CIM5X-TPA/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 output drive capability.
Technical Context
The LM26CIM5X-TPA/NOPB implements a monolithic temperature-sensing architecture with an internal NTC-based sensor feeding a precision comparator referenced to a factory-trimmed DAC. Trip point is fixed at 85°C and cannot be adjusted post-manufacture.
Hysteresis is controlled exclusively by the HYST pin: logic low (GND) selects 10°C hysteresis; logic high (V+) selects 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 monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Trip Point (TOS) | Fixed at 85°C - triggers OS output LOW when die temperature exceeds this threshold. |
| Trip Accuracy | ±3°C over −55°C to +110°C - defines maximum deviation between actual and programmed trip point under operating conditions. |
| Hysteresis | 2°C (HYST = V+) or 10°C (HYST = GND) - prevents output chatter near trip point by shifting comparator reference after activation. |
| VTEMP Slope | −10.82 mV/°C - enables direct temperature calculation from analog output voltage without external calibration. |
| Supply Current | 16 µA typical - ultra-low quiescent current supports battery-powered and always-on thermal monitoring systems. |
| Supply Voltage | 2.7 V to 5.5 V - compatible with common logic rails including 3.3 V and 5 V microcontroller I/O domains. |
| Digital Output | Open-drain, active-low OS - requires external pull-up resistor ≥10 kΩ; interfaces directly with MCU interrupt or power control logic. |
Pinout & Package
LM26CIM5X-TPA/NOPB is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, with thermal pad connected to GND (pin 2) for enhanced thermal coupling to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | HYST | Digital input controlling hysteresis: GND = 10°C, V+ = 2°C; input leakage <10 µA allows simple resistor interface. |
| 2 | GND | Power ground and thermal reference; backside of die bonded to lead frame for accurate lead-temperature sensing. |
| 3 | VTEMP | Analog temperature-proportional output; weak drive (1 µA source / 40 µA sink); requires series resistor if capacitive load >100 pF. |
| 4 | V+ | Positive supply input; must be bypassed with 0.1 µF capacitor; supports 2.7–5.5 V operation with high noise immunity. |
| 5 | OS | Open-drain active-low overtemperature shutdown output; sinks current when T ≥ 85°C; pulls low to signal thermal fault condition. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Full thermostat functionality-including reference, DAC, sensor, and comparator-integrated in single IC; eliminates BOM count and layout complexity. |
| VTEMP analog output | Enables post-assembly PCB testing and real-time temperature readback using host ADC; supports equation-based conversion with ±3°C error bound. |
| Factory-programmed trip point | 85°C set point laser-trimmed during manufacturing; ensures consistent, repeatable thermal response without field calibration. |
| Programmable hysteresis | Two discrete hysteresis options (2°C or 10°C) selected via single digital input (HYST), allowing optimization for system noise and thermal ramp rate. |
| UL recognition | Qualified as UL Recognized Component (E170770), supporting compliance in safety-critical thermal protection applications. |
Applications
| Microprocessor Thermal Management | Fan Control |
|---|---|
Use Scenario: Monitors CPU die temperature in embedded computing systems to prevent thermal throttling or permanent damage. IC Role / Device Role / Timing Role: Digital thermostat providing active-low OS signal to trigger immediate system shutdown or clock gating upon reaching 85°C. Use Value: ±3°C trip accuracy ensures reliable protection within safe silicon junction limits; open-drain output interfaces directly with processor reset or PMIC enable inputs. |
Use Scenario: Controls two-speed DC fan in industrial enclosures where ambient temperature rises above safe operating range. IC Role / Device Role / Timing Role: Overtemperature switch asserting OS low to activate high-speed fan mode or disable heater elements at 85°C. Use Value: Programmable 2°C/10°C hysteresis prevents fan oscillation during slow thermal transients; VTEMP output allows closed-loop speed adjustment via host controller. |
| Portable Battery-Powered Systems | Industrial Process Control |
Use Scenario: Protects lithium-ion battery packs and charging circuits from thermal runaway during fast charging or high-load discharge. IC Role / Device Role / Timing Role: Low-power (16 µA typical) thermal cutoff that asserts OS to disconnect charging FET or disable power path when cell temperature exceeds 85°C. Use Value: Ultra-low supply current extends battery life in always-monitoring configurations; SOT-23 footprint minimizes PCB area in space-constrained designs. |
Use Scenario: Safeguards PLC I/O modules and motor drives against overheating due to overload, blocked airflow, or ambient temperature excursions. IC Role / Device Role / Timing Role: Standalone thermal watchdog asserting OS to initiate controlled shutdown sequence or alert SCADA system via optocoupler interface. Use Value: UL recognition supports functional safety requirements; VTEMP output enables diagnostic logging of thermal history without additional sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermostat applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM26CIM5X-RPA/NOPB | Fixed 65°C trip point; identical pinout, package, and hysteresis programming. | Suitable for lower-threshold thermal protection (e.g., power supply regulation, LED driver derating). | Select when system thermal margin requires earlier intervention than 85°C; no layout changes needed. |
| LM26CIM5X-SHA/NOPB | Fixed 75°C trip point; same architecture, VTEMP output, and open-drain OS functionality. | Optimized for mid-range thermal thresholds (e.g., FPGA thermal throttling, DC-DC converter overtemp). | Choose for tighter thermal guardbanding between nominal operation and failure; shares identical footprint and biasing. |
Compared with LM26CIM5X-TPA/NOPB, the RPA variant offers earlier shutdown at 65°C for conservative thermal budgets, while the SHA variant provides intermediate 75°C triggering-both retain identical hysteresis control, VTEMP functionality, and SOT-23 compatibility, enabling drop-in replacement where trip point is the sole differentiator.
Availability
LM26CIM5X-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 traceability.
Supply support for LM26CIM5X-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 ICs and industrial-grade temperature sensors.
The LM26 series is designed for reliable, factory-calibrated thermal protection in space- and power-constrained systems, targeting applications where deterministic overtemperature response and minimal external components are critical.
FAQ
What is the exact trip temperature of LM26CIM5X-TPA/NOPB?
The LM26CIM5X-TPA/NOPB has a factory-programmed, non-adjustable overtemperature trip point of 85°C. This value is laser-trimmed during manufacturing and specified with ±3°C accuracy across −55°C to +110°C ambient temperature range. The trip point is fixed and cannot be altered by external circuitry or configuration pins.
How does the HYST pin affect hysteresis behavior in LM26CIM5X-TPA/NOPB?
In LM26CIM5X-TPA/NOPB, the HYST pin selects between two hysteresis values: connecting HYST to GND configures 10°C hysteresis, while connecting it to V+ selects 2°C hysteresis. This digital input determines how far the temperature must fall below 85°C before the OS output returns HIGH, preventing output oscillation near the trip threshold.
Can LM26CIM5X-TPA/NOPB be used for undertemperature detection?
No. LM26CIM5X-TPA/NOPB is factory-configured exclusively for overtemperature shutdown (OS) with active-low open-drain output. It does not support undertemperature (US) functionality. For undertemperature detection, alternate variants such as LM26CIM5X-HHD/NOPB (0°C US) must be selected.
What is the purpose and design limitation of the VTEMP pin on LM26CIM5X-TPA/NOPB?
The VTEMP pin on LM26CIM5X-TPA/NOPB provides 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. It has very weak drive capability (1 µA source / 40 µA sink), so external loading must be minimized; capacitive loads >100 pF require series resistance per TI Application Note SNIS115S.
Is LM26CIM5X-TPA/NOPB compatible with 3.3 V microcontroller I/O interfaces?
Yes. LM26CIM5X-TPA/NOPB operates from 2.7 V to 5.5 V and features an open-drain OS output compatible with 3.3 V logic. When used with a 3.3 V pull-up resistor, the OS pin asserts LOW (<0.4 V) under overtemperature condition and floats HIGH (≈3.3 V) otherwise, enabling direct connection to GPIO interrupt pins of 3.3 V MCUs without level-shifting.
LM26CIM5X-TPA/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
LM26CIM5X-TPA/NOPB FAQ
1.How can I place an order for LM26CIM5X-TPA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26CIM5X-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 LM26CIM5X-TPA/NOPB reliable?
The price and inventory of LM26CIM5X-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 LM26CIM5X-TPA/NOPB is usually 5 days.
3.What payment methods are accepted for LM26CIM5X-TPA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26CIM5X-TPA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26CIM5X-TPA/NOPB?
LM26CIM5X-TPA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26CIM5X-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 LM26CIM5X-TPA/NOPB?
For technical support, including LM26CIM5X-TPA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26CIM5X-TPA/NOPB requirements.
6.How does Aetrix verify that LM26CIM5X-TPA/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26CIM5X-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 LM26CIM5X-TPA/NOPB meets industry standards.
7.What is the process for return or replacement of LM26CIM5X-TPA/NOPB?
All LM26CIM5X-TPA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26CIM5X-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 LM26CIM5X-TPA/NOPB part is unused and in its original packaging.
Return procedure for LM26CIM5X-TPA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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