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Texas Instruments LM26CIM5-RPA
- Part No.:
- LM26CIM5-RPA
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM26CIM5-RPA.pdf
- Description:
- THERMOSTAT 65DEGC ACT LO SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,056
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Product details
Overview
LM26CIM5-RPA from Texas Instruments is a factory-preset, ±3°C accurate digital-output thermostat with 65°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, voltage reference, DAC, and comparator in a 5-pin SOT-23 package, operating from 2.7 V to 5.5 V supply and consuming only 16 µA typical supply current. Used for microprocessor thermal protection and fan control in portable systems.
For engineers reviewing the LM26CIM5-RPA datasheet, LM26CIM5-RPA pinout, LM26CIM5-RPA application, or LM26CIM5-RPA equivalent, key selection criteria include confirmed 65°C trip accuracy, open-drain OS output drive capability, HYST pin-controlled hysteresis selection, VTEMP analog output slope (−10.82 mV/°C), and SOT-23 thermal performance under self-heating conditions.
Technical Context
The LM26CIM5-RPA implements a precision analog temperature sensing path feeding an internal comparator with factory-trimmed trip threshold at 65°C. Its VTEMP pin delivers a nonlinear analog voltage defined by VO = (−3.479 × 10⁻⁶ × (T − 30)²) + (−1.082 × 10⁻² × (T − 30)) + 1.8015 V, enabling post-assembly calibration and system-level temperature verification.
Digital output behavior is determined by factory programming: OS is open-drain and active-low, asserting LOW when die temperature exceeds 65°C and returning HIGH only after cooling below (65°C − THYST). Hysteresis value (2°C or 10°C) is selected dynamically by pulling HYST to V+ or GND, respectively, preventing output oscillation near trip point.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Trip Point | 65°C fixed factory setting; triggers overtemperature shutdown event at die temperature ≥65°C |
| Accuracy | ±3°C over −55°C to +110°C range; ensures reliable thermal margin in safety-critical shutdown paths |
| Hysteresis | 2°C (HYST = V+) or 10°C (HYST = GND); prevents chatter during slow thermal transitions |
| VTEMP Slope | −10.82 mV/°C nominal; enables external ADC-based temperature readback with known polynomial correction |
| 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 single-cell Li-ion, 3.3 V, and 5 V logic rails without regulation |
| Output Type | Open-drain OS, active-low; requires external pullup ≥10 kΩ for interrupt or power-control signaling |
Pinout & Package
LM26CIM5-RPA is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, with exposed thermal pad not connected internally. Pin 2 (GND) provides direct thermal conduction path from die backside to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - HYST | Digital input | Selects hysteresis: GND = 10°C, V+ = 2°C; input leakage <10 µA allows direct connection without series resistor |
| 2 - GND | Power ground | Connected to die backside; primary thermal path to PCB; must be low-impedance ground plane connection |
| 3 - VTEMP | Analog output | Temperature-proportional voltage; weak drive (1 µA source / 40 µA sink); requires RC filtering for capacitive loads |
| 4 - V+ | Power supply | 2.7–5.5 V input; requires 0.1 µF ceramic bypass capacitor placed within 2 mm of pin |
| 5 - OS | Digital output | Open-drain, active-low overtemperature signal; sinks ≥1.2 mA at 0.4 V; pulls system interrupt or FET gate |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 65°C trip point | Eliminates external calibration; guarantees ±3°C accuracy across full industrial temperature range |
| Programmable hysteresis | Two discrete hysteresis values (2°C/10°C) selected via single digital input-no resistor network needed |
| VTEMP analog output | Enables post-assembly functional test by forcing VTEMP to trigger OS state change without thermal chamber |
| No external components required | Full thermostat functionality achieved with only 0.1 µF bypass cap; reduces BOM count and layout area |
| UL recognition | Meets UL 60950-1 requirements for end-equipment safety certification in computing and industrial systems |
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: Digital thermostat providing hardware-level overtemperature shutdown signal to reset controller or disable clock generator. Use Value: 65°C trip point aligns with common ARM Cortex-A series thermal throttle thresholds; ±3°C accuracy avoids premature shutdown during transient load spikes. | Use Scenario: Controls 12 V DC fan speed in industrial HMIs based on enclosure temperature. IC Role / Device Role / Timing Role: Overtemperature switch driving N-channel MOSFET gate to enable high-speed fan mode above 65°C. Use Value: Open-drain OS output interfaces directly with logic-level MOSFET; programmable hysteresis prevents fan cycling at ambient temperature fluctuations. |
| Portable Battery-Powered Systems | Industrial Process Control |
Use Scenario: Protects lithium-ion battery packs in handheld test equipment from thermal runaway. IC Role / Device Role / Timing Role: Standalone thermal cutoff that disables charging circuitry when cell temperature exceeds safe limit. Use Value: 16 µA quiescent current extends battery life during storage; SOT-23 footprint minimizes space on compact PCBs. | Use Scenario: Monitors motor driver heatsink temperature in PLC I/O modules to initiate derating or fault reporting. IC Role / Device Role / Timing Role: Hardware watchdog for thermal safety interlock, independent of firmware execution. Use Value: UL recognition supports compliance with IEC 61508 SIL-2 requirements; VTEMP output allows periodic diagnostic readback via host MCU ADC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermostat applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM26CIM5-SHA | Factory-trimmed 75°C trip point; identical pinout, package, and electrical specs | Requires higher thermal margin before shutdown; used where ambient rise delays critical failure | Select when system thermal mass demands later intervention than 65°C |
| LM26CIM5-SPA | Factory-trimmed 70°C trip point; same SOT-23-5 package and open-drain OS output | Narrower thermal window between warning and shutdown; suited for tighter thermal budgets | Choose for applications needing intermediate trip point between 65°C and 75°C |
Compared with LM26CIM5-SHA (75°C) and LM26CIM5-SPA (70°C), the LM26CIM5-RPA provides the earliest overtemperature response in this family, making it optimal for fast-rising thermal events in densely packed electronics where rapid shutdown preserves component integrity.
Availability
LM26CIM5-RPA 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-RPA 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LM26 product line delivers factory-programmable thermostats for hardware-level thermal protection, designed specifically for reliability-critical shutdown functions in space-constrained applications.
FAQ
What is the exact trip temperature and accuracy specification for LM26CIM5-RPA?
The LM26CIM5-RPA has a factory-preset overtemperature trip point of 65°C with guaranteed accuracy of ±3°C over the full operating range of −55°C to +110°C. This specification includes contributions from internal voltage reference, DAC, comparator offset, and temperature sensitivity errors as verified per TI's SNIS115S datasheet revision S. Accuracy degrades to ±4°C at 120°C.
How does the HYST pin affect hysteresis behavior in LM26CIM5-RPA?
The HYST pin on LM26CIM5-RPA selects between two hysteresis values: connecting HYST to GND sets 10°C hysteresis, while connecting it to V+ sets 2°C hysteresis. This digital control eliminates external resistors and allows dynamic adjustment. The hysteresis defines the temperature drop required after trip before OS returns HIGH-i.e., OS goes LOW at 65°C and returns HIGH at 63°C (2°C) or 55°C (10°C).
Can LM26CIM5-RPA be used for undertemperature detection?
No. LM26CIM5-RPA is factory-programmed exclusively for overtemperature shutdown (OS) with active-low open-drain output. It does not support undertemperature (US) functionality. Other variants like LM26CIM5-HHD or LM26CIM5-DPB provide US output, but LM26CIM5-RPA's output function is fixed as OS active-low per Device Comparison Table in SNIS115S.
What is the purpose and drive capability of the VTEMP pin on LM26CIM5-RPA?
The VTEMP pin on LM26CIM5-RPA 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 sources ≤1 µA and sinks ≤40 µA. Due to weak drive, it must interface with high-impedance nodes (e.g., MCU ADC input) and requires series resistance for capacitive loads >100 pF to prevent oscillation.
Is LM26CIM5-RPA compatible with standard SOT-23 PCB footprints and reflow profiles?
Yes. LM26CIM5-RPA uses the industry-standard 5-pin SOT-23 (DBV) package with 2.90 mm × 1.60 mm body size and 0.95 mm pitch. It is qualified for vapor-phase soldering up to 215°C (60 s) and infrared reflow up to 220°C (15 s), matching JEDEC J-STD-020D. Thermal pad is unconnected; no special stencil or thermal relief is required beyond standard SOT-23 layout guidelines.
LM26CIM5-RPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Trip Temperature Threshold:
- Hot
- Switching Temperature:
- 65°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-RPA FAQ
1.How can I place an order for LM26CIM5-RPA through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26CIM5-RPA 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-RPA reliable?
The price and inventory of LM26CIM5-RPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM26CIM5-RPA is usually 5 days.
3.What payment methods are accepted for LM26CIM5-RPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26CIM5-RPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26CIM5-RPA?
LM26CIM5-RPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26CIM5-RPA 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-RPA?
For technical support, including LM26CIM5-RPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26CIM5-RPA requirements.
6.How does Aetrix verify that LM26CIM5-RPA is sourced from the original manufacturer or authorized distributors?
All LM26CIM5-RPA 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-RPA meets industry standards.
7.What is the process for return or replacement of LM26CIM5-RPA?
All LM26CIM5-RPA units undergo pre-shipment inspection (PSI). If there is an issue with LM26CIM5-RPA, 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-RPA part is unused and in its original packaging.
Return procedure for LM26CIM5-RPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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