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Texas Instruments LM26CIM5-XPA/NOPB
- Part No.:
- LM26CIM5-XPA/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM26CIM5-XPA/NOPB.pdf
- Description:
- THERMOSTAT 105DEG ACT LO SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,714
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Product details
Overview
LM26CIM5-XPA/NOPB from Texas Instruments is a factory-preset, ±3°C accurate digital-output thermostat with fixed 105°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 for microprocessor thermal protection and fan control.
For engineers reviewing the LM26CIM5-XPA/NOPB datasheet, LM26CIM5-XPA/NOPB pinout, LM26CIM5-XPA/NOPB application, or LM26CIM5-XPA/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 = GND → 10°C), and open-drain output drive capability (≤0.4 V at 1.2 mA).
Technical Context
The LM26CIM5-XPA/NOPB implements a precision analog temperature sensing path feeding an internal comparator with factory-trimmed reference and DAC, enabling fixed 105°C trip point without external components. Its VTEMP pin outputs a calibrated voltage defined by VO = (−3.479 × 10⁻⁶ × (T − 30)²) + (−1.082 × 10⁻² × (T − 30)) + 1.8015 V, supporting post-assembly validation.
Hysteresis is digitally selected: HYST = GND yields 10°C hysteresis (TOS − THYST = 95°C), while HYST = V+ yields 2°C (TOS − THYST = 103°C). The open-drain OS output requires ≥10 kΩ pullup and sinks ≤1.2 mA to assert LOW at trip, with <0.4 V saturation under load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Trip Point (TOS) | 105°C fixed - triggers OS LOW when die temperature exceeds 105°C; used for thermal shutdown of CPUs or power stages. |
| Trip Accuracy | ±3°C (−55°C to +110°C) - ensures reliable activation within 3°C of setpoint without calibration. |
| Hysteresis | 10°C typical (HYST = GND) - prevents output chatter during slow temperature transitions near trip point. |
| VTEMP Slope | −10.82 mV/°C - enables system-level temperature monitoring via ADC with known linear coefficient. |
| Supply Current | 16 µA typical (2.7–5.5 V) - supports battery-powered systems with multi-year operation on coin cells. |
| Output Type | Open-drain, active-low OS - interfaces directly with MCU interrupt pins or logic-level MOSFET gates without level-shifting. |
| Package | SOT-23 (DBV), 2.90 mm × 1.60 mm - surface-mount compatible with high-density PCB layouts and automated assembly. |
Pinout & Package
LM26CIM5-XPA/NOPB uses a 5-pin SOT-23 (DBV) package with exposed thermal pad not connected internally; GND (pin 2) serves as primary thermal conduction path from die backside.
| 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 | Die backside bonded to lead frame; primary thermal path and reference for all internal circuitry. |
| 3 - VTEMP | Analog output | Temperature-proportional voltage (−10.82 mV/°C); weak drive (1 µA source / 40 µA sink) requires high-Z ADC interface. |
| 4 - V+ | Power supply | 2.7–5.5 V input; requires 0.1 µF ceramic bypass capacitor close to pin for noise immunity. |
| 5 - OS | Digital output | Open-drain, active-low overtemperature signal; must be pulled up externally (≥10 kΩ) to V+ or logic rail. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Factory-programmed trip point and hysteresis eliminate need for resistors, capacitors, or trimming circuits. |
| VTEMP analog output | Enables post-assembly board testing and real-time temperature readback without adding discrete sensors. |
| Programmable hysteresis | Two-point selection (2°C or 10°C) via single digital input accommodates varying system noise and thermal ramp rates. |
| UL recognition | Meets UL 1577 requirements for reinforced insulation, supporting safety-critical thermal protection in industrial equipment. |
| High PSRR | Immune to 400 kHz square-wave (1 Vpp) and 100 Hz–1 MHz sine-wave (200 mVpp) supply noise - eliminates false trips in noisy environments. |
Applications
| Microprocessor Thermal Management | Fan Control |
|---|---|
|
Use Scenario: Monitors CPU die temperature in embedded computing modules to prevent thermal throttling or permanent damage. IC Role / Device Role / Timing Role: Digital thermostat asserting OS LOW at 105°C to trigger immediate system shutdown or clock gating. Use Value: ±3°C trip accuracy ensures shutdown occurs before silicon reliability limits are exceeded, while 10°C hysteresis prevents oscillation during thermal recovery. |
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 N-channel MOSFET gate; OS LOW activates high-speed mode. Use Value: Open-drain output interfaces directly with logic-level MOSFETs; VTEMP output allows firmware to log actual temperature for predictive maintenance. |
| Portable Battery-Powered Systems | Industrial Process Control |
|
Use Scenario: Protects Li-ion battery packs in handheld test equipment from overtemperature during fast charging. IC Role / Device Role / Timing Role: Standalone thermal cutoff with ultra-low quiescent current (16 µA typical) minimizing standby drain. Use Value: 2.7 V minimum supply enables operation across full battery discharge curve; SOT-23 footprint saves space in compact enclosures. |
Use Scenario: Safeguards PLC I/O modules against ambient overheating in unventilated control cabinets. IC Role / Device Role / Timing Role: Fixed-point thermostat monitoring module case temperature; OS LOW disables output drivers to prevent thermal runaway. Use Value: UL recognition validates use in safety-rated subsystems; 105°C trip aligns with industrial component derating guidelines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermostat applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM26CIM5-VPA/NOPB | Fixed 95°C trip point; identical pinout, hysteresis, and VTEMP characteristics. | Used where lower thermal margin is acceptable (e.g., ambient-limited enclosures). | Select when system thermal design targets shutdown below 105°C to preserve component lifetime. |
| MAX6505UTP+T | 4-pin SOT-23, 105°C trip, push-pull output (no pullup required), ±2.5°C accuracy. | Lacks VTEMP analog output; higher supply current (25 µA typical). | Choose when board space is constrained and analog monitoring is unnecessary; push-pull simplifies BOM. |
Compared with LM26CIM5-XPA/NOPB, LM26CIM5-VPA/NOPB offers earlier shutdown for tighter thermal margins, while MAX6505UTP+T trades VTEMP functionality for simpler output drive and slightly better accuracy-both require no PCB changes but differ in thermal response and diagnostic capability.
Availability
LM26CIM5-XPA/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 LM26CIM5-XPA/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 product line delivers factory-programmed thermostats for system-level thermal protection, designed specifically for reliability-critical applications in computing, industrial automation, and power electronics where consistent trip behavior and minimal external components are essential.
FAQ
What is the exact trip temperature of LM26CIM5-XPA/NOPB and how is it programmed?
The LM26CIM5-XPA/NOPB has a fixed factory-programmed overtemperature trip point of 105°C. This value is laser-trimmed during manufacturing and cannot be adjusted in-circuit. Trip accuracy is specified as ±3°C across −55°C to +110°C ambient, including errors from reference, DAC, comparator offset, and temperature sensitivity. The LM26CIM5-XPA/NOPB part number encodes "XPA" per TI's template: X = 100°C, P = +5°C, yielding 105°C.
How does the HYST pin affect hysteresis in LM26CIM5-XPA/NOPB?
In LM26CIM5-XPA/NOPB, the HYST pin selects between two hysteresis values: connecting HYST to GND sets typical hysteresis to 10°C (TOS − THYST = 95°C), while connecting HYST to V+ sets it to 2°C (TOS − THYST = 103°C). This digital selection prevents output oscillation near the trip point and accommodates varying thermal ramp rates and system noise levels without external components.
Can LM26CIM5-XPA/NOPB be used for undertemperature detection?
No. The LM26CIM5-XPA/NOPB is factory-configured exclusively for overtemperature shutdown (OS) with active-low open-drain output. While the broader LM26 family includes US (undertemperature shutdown) variants, the XPA suffix denotes OS functionality only. For undertemperature applications, alternative part numbers such as LM26CIM5-HHD (0°C US) must be selected.
What is the purpose and drive capability of the VTEMP pin on LM26CIM5-XPA/NOPB?
The VTEMP pin on LM26CIM5-XPA/NOPB provides an analog voltage proportional to die temperature (−10.82 mV/°C), enabling post-assembly verification and real-time monitoring. It has very weak drive capability: ≤1 µA source current and ≤40 µA sink current. Connecting low-impedance loads or capacitive traces (>100 pF) without series resistance risks oscillation; TI recommends adding 820 Ω–10 kΩ series resistance for stability.
Is LM26CIM5-XPA/NOPB compatible with 3.3 V and 5 V supply rails?
Yes. LM26CIM5-XPA/NOPB operates across 2.7 V to 5.5 V, making it fully compatible with both 3.3 V and 5 V logic systems. Its open-drain OS output can be pulled up to any voltage ≤5.5 V, including 3.3 V MCU interrupt inputs. Supply current remains stable (16 µA typical) across this range, and HYST input thresholds scale with V+ (VIH = 0.8 × V+, VIL = 0.2 × V+), ensuring robust logic-level compatibility.
LM26CIM5-XPA/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:
- 105°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-XPA/NOPB FAQ
1.How can I place an order for LM26CIM5-XPA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26CIM5-XPA/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-XPA/NOPB reliable?
The price and inventory of LM26CIM5-XPA/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-XPA/NOPB is usually 5 days.
3.What payment methods are accepted for LM26CIM5-XPA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26CIM5-XPA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26CIM5-XPA/NOPB?
LM26CIM5-XPA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26CIM5-XPA/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-XPA/NOPB?
For technical support, including LM26CIM5-XPA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26CIM5-XPA/NOPB requirements.
6.How does Aetrix verify that LM26CIM5-XPA/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26CIM5-XPA/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-XPA/NOPB meets industry standards.
7.What is the process for return or replacement of LM26CIM5-XPA/NOPB?
All LM26CIM5-XPA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26CIM5-XPA/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-XPA/NOPB part is unused and in its original packaging.
Return procedure for LM26CIM5-XPA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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