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Texas Instruments LM26CIM5-VHA/NOPB
- Part No.:
- LM26CIM5-VHA/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM26CIM5-VHA/NOPB.pdf
- Description:
- THERMOSTAT 90DEGC ACT LO SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:834
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Product details
Overview
LM26CIM5-VHA/NOPB from Texas Instruments is a factory-preset, ±3°C accurate digital-output thermostat with fixed 90°C overtemperature shutdown trip point, open-drain active-low OS output, and programmable 2°C/10°C hysteresis via HYST pin. It operates from 2.7 V to 5.5 V, draws only 16 µA typical supply current, and provides analog VTEMP output for post-assembly verification in thermal protection circuits.
For engineers reviewing the LM26CIM5-VHA/NOPB datasheet, LM26CIM5-VHA/NOPB pinout, LM26CIM5-VHA/NOPB application, or LM26CIM5-VHA/NOPB equivalent, key selection criteria include trip point accuracy (±3°C), hysteresis configuration flexibility, VTEMP slope (−10.82 mV/°C), and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The LM26CIM5-VHA/NOPB integrates a precision temperature sensor, internal voltage reference, DAC, and comparator in a single die. Its trip point is factory-programmed to 90°C and cannot be adjusted externally; the comparator output triggers OS low when die temperature exceeds 90°C and returns high after cooling below (90°C − THYST).
Hysteresis is selected digitally: HYST = GND yields 10°C hysteresis (trip return at 80°C), while HYST = V+ yields 2°C hysteresis (trip return at 88°C). The VTEMP pin outputs a calibrated analog voltage defined by VO = (−3.479 × 10⁻⁶ × (T − 30)²) + (−1.082 × 10⁻² × (T − 30)) + 1.8015 V, enabling system-level temperature readback without external sensors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Trip Point | Fixed at 90°C - triggers overtemperature shutdown event without calibration or external components. |
| Accuracy | ±3°C over −55°C to +110°C - ensures reliable thermal margin in microprocessor and power supply protection. |
| Hysteresis | Selectable 2°C or 10°C - prevents output chatter during slow thermal transitions near trip point. |
| VTEMP Slope | −10.82 mV/°C - enables direct ADC measurement of die temperature for diagnostics and validation. |
| Supply Current | 16 µA typical - supports ultra-low-power battery-operated systems and always-on thermal monitoring. |
| Output Type | Open-drain active-low OS - interfaces directly with MCU interrupt pins or logic-level power controllers using external pull-up. |
| Operating Voltage | 2.7 V to 5.5 V - compatible with 3.3 V and 5 V logic domains without level-shifting. |
Pinout & Package
LM26CIM5-VHA/NOPB is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, with exposed thermal pad not electrically connected. Pin 2 (GND) serves as both electrical ground and primary thermal conduction path to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - HYST | Digital input | Controls 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 for thermal conduction; must be tied to system ground plane for accuracy and noise immunity. |
| 3 - VTEMP | Analog output | Provides temperature-proportional voltage; weak drive (1 µA source / 40 µA sink) requires high-impedance ADC or buffered readout. |
| 4 - V+ | Power supply | Accepts 2.7–5.5 V; requires 0.1 µF ceramic bypass capacitor placed adjacent to pin for noise rejection. |
| 5 - OS | Digital output | Open-drain active-low overtemperature signal; requires ≥10 kΩ pull-up to V+ or controller I/O rail. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 90°C trip point | Eliminates need for external calibration components or firmware compensation in thermal shutdown designs. |
| VTEMP analog output | Enables post-assembly functional test by forcing VTEMP to verify comparator and output stage operation without thermal chamber. |
| Programmable hysteresis | Allows system-level optimization: 2°C for fast-response fan control, 10°C for noisy industrial environments. |
| No external components required | Reduces BOM count and layout area; simplifies qualification for safety-critical applications like power supply OVP. |
| UL recognition | Meets UL 1577 requirements for reinforced insulation - supports compliance in AC/DC adapter and industrial power designs. |
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 hard-wired overtemperature shutdown signal to PMIC or reset controller. Use Value: ±3°C trip accuracy ensures shutdown occurs before silicon junction exceeds safe operating limit (e.g., 105°C), preserving reliability. | Use Scenario: Controls two-speed DC fan in industrial motor drives based on heatsink temperature. IC Role / Device Role / Timing Role: Trip-point switch triggering fan speed increase at 90°C; hysteresis prevents oscillation during transient heating. Use Value: 2°C hysteresis setting enables rapid response to sudden load spikes while avoiding false triggers from ambient airflow fluctuations. |
| Portable Battery-Powered Systems | Electronic System Protection |
Use Scenario: Guards lithium-ion battery packs against overtemperature during fast charging in handheld medical devices. IC Role / Device Role / Timing Role: Standalone thermal cutoff that disables charging FET gate driver upon reaching 90°C. Use Value: 16 µA quiescent current extends battery runtime during standby; open-drain output interfaces directly with low-voltage charge management ICs. | Use Scenario: Provides redundant overtemperature detection in telecom power supplies alongside digital thermal sensors. IC Role / Device Role / Timing Role: Hardware-level fail-safe that cuts auxiliary bias supply if main converter MOSFETs exceed safe junction temperature. Use Value: UL recognition and ±3°C accuracy support dual-redundancy architectures meeting IEC 62368-1 safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermostat applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM26CIM5-TPA/NOPB | Fixed 85°C trip point; identical pinout, hysteresis options, and VTEMP functionality. | Suitable where lower trip threshold is acceptable for earlier thermal intervention in microprocessor or FPGA applications. | Select when system thermal margin requires shutdown before reaching 90°C - no layout or firmware changes needed. |
| MAX6505UTA+T | Fixed 95°C trip point; 3-pin SOT-23 package; no VTEMP output; 5 µA supply current. | Limited to basic shutdown-only use cases where analog temperature readback is unnecessary and board space is extremely constrained. | Choose only if VTEMP diagnostics are omitted and footprint reduction outweighs loss of post-assembly test capability. |
Compared with LM26CIM5-VHA/NOPB, LM26CIM5-TPA/NOPB offers earlier shutdown at 85°C with full feature parity, while MAX6505UTA+T sacrifices VTEMP and hysteresis flexibility for minimal size and ultra-low current - making it suitable only for cost- and space-sensitive applications lacking diagnostic requirements.
Availability
LM26CIM5-VHA/NOPB is available at Aetrix Electronics and suitable for microprocessor thermal management, portable battery-powered systems, and electronic system protection requiring stable component supply across extended production lifecycles.
Supply support for LM26CIM5-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 and embedded processing technologies, with leadership in precision analog ICs and power management solutions.
The LM26 series was designed specifically for hardware-based thermal protection in space-constrained, low-power systems - delivering factory-calibrated accuracy without software dependency or external passive components.
FAQ
What is the exact trip temperature of LM26CIM5-VHA/NOPB and how is it set?
The LM26CIM5-VHA/NOPB has a factory-programmed trip point of exactly 90°C for overtemperature shutdown. This value is laser-trimmed during manufacturing and cannot be altered externally. It is specified with ±3°C accuracy over −55°C to +110°C ambient, ensuring consistent behavior across production lots without calibration. The trip point is permanently encoded in the device's internal DAC and reference circuitry.
Can LM26CIM5-VHA/NOPB be used for undertemperature detection?
No, LM26CIM5-VHA/NOPB is configured exclusively for overtemperature shutdown (OS) with active-low open-drain output. Its output function and trip direction are fixed at manufacture. For undertemperature applications, TI offers variants such as LM26CIM5-HHD/NOPB (0°C US output) or LM26CIM5-BPB/NOPB (−45°C US output), which share the same SOT-23-5 package but differ in output polarity and trip direction.
How does the HYST pin affect hysteresis in LM26CIM5-VHA/NOPB?
In LM26CIM5-VHA/NOPB, the HYST pin selects between two hysteresis values: connecting HYST to GND sets 10°C hysteresis (return at 80°C), while connecting HYST to V+ sets 2°C hysteresis (return at 88°C). This is implemented via internal resistor ladder and comparator threshold adjustment - no external components are needed. Input thresholds are VIH = 0.8×V+ and VIL = 0.2×V+, supporting direct MCU GPIO control.
What is the purpose and drive capability of the VTEMP pin on LM26CIM5-VHA/NOPB?
The VTEMP pin on LM26CIM5-VHA/NOPB provides an analog voltage proportional to die temperature, defined by VO = (−3.479 × 10⁻⁶ × (T − 30)²) + (−1.082 × 10⁻² × (T − 30)) + 1.8015 V. It has weak drive capability: ≤1 µA source, ≤40 µA sink. This limits interfacing to high-impedance inputs only - direct connection to ADCs with >1 MΩ input impedance is safe; op-amp buffering is recommended for driving cables or low-impedance loads.
Is LM26CIM5-VHA/NOPB RoHS-compliant and what packaging does it use?
Yes, LM26CIM5-VHA/NOPB is RoHS-compliant and supplied in tape-and-reel packaging per JEDEC standard J-STD-020. It uses a 5-pin SOT-23 (DBV) plastic package with 2.90 mm × 1.60 mm body size and 0.95 mm height. The "/NOPB" suffix explicitly denotes lead-free (Pb-free) construction, and the device meets TI's green chemistry requirements including halogen-free molding compound.
LM26CIM5-VHA/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:
- 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
LM26CIM5-VHA/NOPB FAQ
1.How can I place an order for LM26CIM5-VHA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26CIM5-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 LM26CIM5-VHA/NOPB reliable?
The price and inventory of LM26CIM5-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 LM26CIM5-VHA/NOPB is usually 5 days.
3.What payment methods are accepted for LM26CIM5-VHA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26CIM5-VHA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26CIM5-VHA/NOPB?
LM26CIM5-VHA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26CIM5-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 LM26CIM5-VHA/NOPB?
For technical support, including LM26CIM5-VHA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26CIM5-VHA/NOPB requirements.
6.How does Aetrix verify that LM26CIM5-VHA/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26CIM5-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 LM26CIM5-VHA/NOPB meets industry standards.
7.What is the process for return or replacement of LM26CIM5-VHA/NOPB?
All LM26CIM5-VHA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26CIM5-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 LM26CIM5-VHA/NOPB part is unused and in its original packaging.
Return procedure for LM26CIM5-VHA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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