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Texas Instruments LM26CIM5X-VHA/NOPB
- Part No.:
- LM26CIM5X-VHA/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM26CIM5X-VHA/NOPB.pdf
- Description:
- THERMOSTAT 90DEGC ACT LO SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,272
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Product details
Overview
LM26CIM5X-VHA/NOPB from Texas Instruments is a factory-preset, ±3°C accurate digital-output thermostat with fixed 90°C overtemperature shutdown (OS), open-drain active-low output, and analog VTEMP pin for system-level temperature verification. It operates from 2.7 V to 5.5 V, draws only 16 µA typical supply current, and features user-selectable 2°C or 10°C hysteresis via the HYST pin. Used in microprocessor thermal management and fan control circuits where precise, low-power die-temperature monitoring is required.
For engineers reviewing the LM26CIM5X-VHA/NOPB datasheet, LM26CIM5X-VHA/NOPB pinout, LM26CIM5X-VHA/NOPB application, or LM26CIM5X-VHA/NOPB equivalent, key selection criteria include trip point accuracy (±3°C), hysteresis configurability, VTEMP analog output slope (−10.82 mV/°C), open-drain output drive capability, and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The LM26CIM5X-VHA/NOPB integrates a precision bandgap temperature sensor, internal voltage reference, DAC, and comparator in a single 5-pin SOT-23 package. Its trip point is factory-programmed to 90°C and cannot be adjusted externally; the digital output is fixed as active-low open-drain OS. The VTEMP pin provides a calibrated analog voltage per the polynomial equation VO = (−3.479 × 10⁻⁶ × (T − 30)²) + (−1.082 × 10⁻² × (T − 30)) + 1.8015 V.
Hysteresis is controlled solely by the HYST pin logic level: GND selects 10°C, V+ selects 2°C. No external components are required for basic thermostat operation. The device supports after-assembly PCB testing via forced VTEMP voltage injection to verify comparator and output functionality without thermal cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Trip Point (TOS) | 90°C - Factory-programmed fixed overtemperature shutdown threshold; no external adjustment possible. |
| Trip Accuracy | ±3°C (−55°C to +110°C) - Ensures reliable thermal shutdown within tight margin across industrial temperature range. |
| Hysteresis Options | 2°C (HYST = V+) or 10°C (HYST = GND) - Prevents output chatter near trip point; selected by simple logic-level connection. |
| VTEMP Slope | −10.82 mV/°C - Enables direct temperature readback using external ADC; supports post-assembly functional test without thermal chamber. |
| Supply Current | 16 µA typical - Ultra-low quiescent power enables use in battery-powered or always-on thermal monitoring systems. |
| Output Type | Open-drain, active-low OS - Requires external pull-up; compatible with 1.8 V–5.5 V logic interfaces and simplifies interfacing to MCU interrupt pins. |
| Operating Voltage | 2.7 V to 5.5 V - Supports wide input rail range including single Li-ion, 3.3 V, and 5 V systems without LDO. |
Pinout & Package
LM26CIM5X-VHA/NOPB 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) connects directly to the die backside for optimal thermal coupling 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 | Die backside thermal path; must connect to system ground plane for accurate die-temperature sensing and thermal stability. |
| 3 - VTEMP | Analog output | Temperature-proportional voltage (−10.82 mV/°C); weak drive (1 µA source / 40 µA sink); requires high-Z load or RC compensation for capacitive loads. |
| 4 - V+ | Power supply | 2.7 V–5.5 V input; bypass with 0.1 µF capacitor near pin to ensure noise immunity and stable reference operation. |
| 5 - OS | Digital output | Active-low open-drain overtemperature shutdown signal; requires ≥10 kΩ pull-up; sinks up to 1.2 mA at 0.4 V. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed trip point | 90°C setpoint with ±3°C accuracy over −55°C to +110°C - eliminates calibration effort and ensures consistent thermal response across production lots. |
| VTEMP analog output | Polynomial-calibrated voltage output enabling software-based temperature readback and post-assembly functional test without thermal cycling. |
| No external components | Self-contained thermostat requiring only V+, GND, and pull-up on OS - reduces BOM count, layout area, and failure modes in cost-sensitive applications. |
| Programmable hysteresis | 2°C or 10°C via single HYST pin logic level - adapts to system noise profile and thermal ramp rate without changing hardware. |
| UL recognition | UL Recognized Component (E170797) - satisfies safety certification requirements for end equipment in industrial and consumer markets. |
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 providing active-low OS signal to trigger immediate system shutdown or clock gating when die reaches 90°C. Use Value: ±3°C trip accuracy ensures shutdown occurs before silicon reliability limits are exceeded; VTEMP enables runtime temperature logging via host ADC. |
Use Scenario: Controls two-speed cooling fan in industrial PLC enclosures based on ambient or heatsink temperature. IC Role / Device Role / Timing Role: Overtemperature switch driving N-channel MOSFET gate (via pull-up) to activate high-speed fan mode at 90°C. Use Value: 2°C hysteresis prevents fan oscillation during slow thermal transients; open-drain output simplifies level-shifting to 12 V fan supply rails. |
| Portable Battery-Powered Systems | Industrial Process Control |
|
Use Scenario: Protects lithium-ion battery packs in handheld test equipment from overheating during fast charging cycles. IC Role / Device Role / Timing Role: Low-power (16 µA) thermal cutoff that asserts OS to disable charging FET when cell temperature exceeds safe limit. Use Value: Minimal current draw extends battery life during standby; SOT-23-5 footprint fits tight space constraints near battery connector. |
Use Scenario: Safeguards programmable logic controller (PLC) I/O modules against ambient overtemperature in uncooled cabinets. IC Role / Device Role / Timing Role: Standalone thermal watchdog asserting OS to halt process execution and illuminate fault LED at 90°C cabinet temperature. Use Value: UL recognition supports CE/IEC 61000-6-4 compliance; VTEMP output enables remote temperature diagnostics via HART or Modbus RTU interface. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermostat applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM26CIM5X-TPA/NOPB | Fixed 85°C trip point; identical pinout, VTEMP, hysteresis options, and supply specs. | Suitable where lower trip threshold is acceptable for earlier thermal intervention (e.g., CPU throttling before shutdown). | Select when system thermal budget allows activation at 85°C instead of 90°C; drop-in replacement except for trip point. |
| MAX6505UTA+T | Fixed 90°C trip, ±2.5°C accuracy, 3.0 V–5.5 V supply, push-pull output (not open-drain), no VTEMP pin. | Lacks analog temperature readback; requires different MCU interface (no external pull-up needed); higher accuracy but less diagnostic capability. | Choose when VTEMP is unnecessary and push-pull output simplifies design; not suitable for after-assembly test or multi-threshold verification. |
Compared with LM26CIM5X-VHA/NOPB, LM26CIM5X-TPA/NOPB offers earlier thermal response at 85°C with identical diagnostics and layout, while MAX6505UTA+T trades VTEMP functionality for tighter accuracy and simplified output drive-making it viable only where analog verification is omitted.
Availability
LM26CIM5X-VHA/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 traceable sourcing for industrial OEM programs.
Supply support for LM26CIM5X-VHA/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, embedded processing, and connectivity technologies, with leadership in precision analog ICs and industrial-grade sensors.
The LM26 series is designed for embedded thermal protection applications requiring factory-set accuracy, minimal external components, and diagnostic capability via analog temperature output-targeting industrial, computing, and automotive subsystems.
FAQ
What is the exact trip temperature of LM26CIM5X-VHA/NOPB?
The LM26CIM5X-VHA/NOPB has a factory-programmed fixed overtemperature shutdown trip point of 90°C. This value is laser-trimmed during manufacturing and cannot be altered externally. Trip accuracy is guaranteed at ±3°C over the full operating range of −55°C to +110°C, as specified in the TI SNIS115S datasheet.
Does LM26CIM5X-VHA/NOPB support both overtemperature and undertemperature shutdown?
No. LM26CIM5X-VHA/NOPB is configured exclusively for overtemperature shutdown (OS) with active-low open-drain output. It does not provide undertemperature (US) functionality. The output type and trip direction are fixed at manufacture and cannot be reconfigured. Other variants like LM26CIM5X-HHD support US mode, but LM26CIM5X-VHA/NOPB is OS-only.
How is hysteresis selected on LM26CIM5X-VHA/NOPB?
Hysteresis on LM26CIM5X-VHA/NOPB is selected by the logic level applied to the HYST pin (Pin 1): connecting HYST to GND configures 10°C hysteresis, while connecting it to V+ configures 2°C hysteresis. Input thresholds are VIH = 0.8 × V+ and VIL = 0.2 × V+, with leakage current under 10 µA-enabling direct connection without series resistors in most designs.
Can the VTEMP pin of LM26CIM5X-VHA/NOPB be used for accurate temperature measurement?
Yes. The VTEMP pin outputs a calibrated analog voltage described by VO = (−3.479 × 10⁻⁶ × (T − 30)²) + (−1.082 × 10⁻² × (T − 30)) + 1.8015 V, with −10.82 mV/°C nominal slope. Accuracy is ±3°C over −30°C to +120°C. For precise measurement, use a high-impedance ADC input and apply RC compensation if capacitive loading exceeds 100 pF, as detailed in the LM26CIM5X-VHA/NOPB datasheet.
Is LM26CIM5X-VHA/NOPB RoHS-compliant and lead-free?
Yes. LM26CIM5X-VHA/NOPB carries the "/NOPB" suffix, indicating lead-free (Pb-free) and RoHS-compliant construction per Texas Instruments' environmental specifications. It meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1 and is qualified for reflow soldering per IPC/JEDEC J-STD-020 standards.
LM26CIM5X-VHA/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:
- 90°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-VHA/NOPB FAQ
1.How can I place an order for LM26CIM5X-VHA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26CIM5X-VHA/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-VHA/NOPB reliable?
The price and inventory of LM26CIM5X-VHA/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-VHA/NOPB is usually 5 days.
3.What payment methods are accepted for LM26CIM5X-VHA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26CIM5X-VHA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26CIM5X-VHA/NOPB?
LM26CIM5X-VHA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26CIM5X-VHA/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-VHA/NOPB?
For technical support, including LM26CIM5X-VHA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26CIM5X-VHA/NOPB requirements.
6.How does Aetrix verify that LM26CIM5X-VHA/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26CIM5X-VHA/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-VHA/NOPB meets industry standards.
7.What is the process for return or replacement of LM26CIM5X-VHA/NOPB?
All LM26CIM5X-VHA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26CIM5X-VHA/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-VHA/NOPB part is unused and in its original packaging.
Return procedure for LM26CIM5X-VHA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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