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Texas Instruments LM26CIM5-YPA/NOPB
- Part No.:
- LM26CIM5-YPA/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM26CIM5-YPA/NOPB.pdf
- Description:
- THERMOSTAT 115DEG ACT LO SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:624
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Product details
Overview
LM26CIM5-YPA/NOPB from Texas Instruments is a factory-preset, ±3°C accurate digital-output thermostat with fixed 115°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 and fan control applications.
For engineers reviewing the LM26CIM5-YPA/NOPB datasheet, LM26CIM5-YPA/NOPB pinout, LM26CIM5-YPA/NOPB application, or LM26CIM5-YPA/NOPB equivalent, key selection factors include confirmed 115°C trip accuracy, 2.7–5.5 V supply range, 16 µA typical supply current, VTEMP analog output with −10.82 mV/°C slope, and HYST-controlled hysteresis configuration.
Technical Context
The LM26CIM5-YPA/NOPB implements a precision analog temperature sensing front-end feeding an internal comparator with factory-trimmed trip threshold at 115°C. Its VTEMP pin outputs a 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: LM26CIM5-YPA/NOPB is configured as OS (overtemperature shutdown), active-low, open-drain, requiring ≥10 kΩ pullup. Hysteresis is selected externally-HYST = GND yields 10°C, HYST = V+ yields 2°C-with no external components needed for basic operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Trip Point | 115°C fixed overtemperature shutdown threshold; die temperature must exceed this to assert OS low. |
| Accuracy | ±3°C over −55°C to +110°C ambient; includes sensor, reference, DAC, and comparator offset errors. |
| Hysteresis | 2°C (HYST = V+) or 10°C (HYST = GND); prevents output chatter near trip point by shifting comparator reference. |
| VTEMP Slope | −10.82 mV/°C; enables external ADC-based temperature readback with known polynomial equation. |
| Supply Range | 2.7 V to 5.5 V; supports single-supply operation across battery-powered and industrial rails. |
| Supply Current | 16 µA typical, 40 µA max; ultra-low quiescent draw suitable for always-on thermal monitoring. |
| Digital Output | Open-drain, active-low OS; requires external pullup; sinks ≥1.2 mA at 0.4 V for reliable controller interrupt signaling. |
Pinout & Package
LM26CIM5-YPA/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 | Selects hysteresis: logic high (V+) sets 2°C; logic low (GND) sets 10°C; <10 µA leakage ensures minimal loading. |
| 2 - GND | Power ground | Connected directly to die backside; primary thermal path to PCB; must be solidly tied to system ground. |
| 3 - VTEMP | Analog output | Temperature-proportional voltage output; weak drive (1 µA source / 40 µA sink); requires high-impedance ADC or series resistor for capacitive loads. |
| 4 - V+ | Power supply | 2.7–5.5 V input; requires 0.1 µF bypass capacitor close to pin; rejects noise up to 400 kHz square wave (1 Vp-p). |
| 5 - OS | Digital output | Open-drain, active-low overtemperature shutdown signal; asserts low when die temp ≥115°C; needs ≥10 kΩ pullup to V+ or controller rail. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-preset trip point | 115°C fixed threshold eliminates external component tuning and ensures repeatable thermal shutdown behavior. |
| VTEMP analog output | Enables after-assembly PCB testing and real-time temperature readback without adding discrete sensors. |
| Programmable hysteresis | 2°C or 10°C selection via single digital input allows optimization for fast-transient or noisy thermal environments. |
| No external components required | Self-contained sensing and decision circuitry reduces BOM count and layout complexity for compact thermal protection. |
| UL recognition | Meets UL 1459 requirements for end-equipment safety certification in industrial and consumer applications. |
Applications
| Microprocessor Thermal Management | Fan Control |
|---|---|
Use Scenario: Monitors CPU die temperature during high-load operation to prevent thermal throttling or permanent damage. IC Role / Device Role / Timing Role: Standalone overtemperature shutdown detector with 115°C trip point and open-drain OS output driving processor reset or power sequencer. Use Value: Guarantees shutdown before silicon exceeds safe junction limit; ±3°C accuracy ensures consistent trigger margin across production units. | Use Scenario: Controls two-speed cooling fan activation based on system enclosure temperature. IC Role / Device Role / Timing Role: Digital thermostat asserting OS low at 115°C to switch fan to maximum speed or initiate emergency airflow escalation. Use Value: Eliminates need for thermistor + comparator discrete solution; programmable hysteresis prevents fan oscillation near trip point. |
| Industrial Process Control | Electronic System Protection |
Use Scenario: Safeguards motor drives or power converters against overheating in enclosed cabinets with limited airflow. IC Role / Device Role / Timing Role: Overtemperature watchdog placed thermally adjacent to heat-generating components; OS output disables gate drivers or latches fault condition. Use Value: 2.7–5.5 V supply range supports direct integration into 3.3 V or 5 V control logic; 16 µA current enables long-life battery backup operation. | Use Scenario: Provides fail-safe thermal cutoff for sealed power supplies or LED lighting modules where internal hot spots may develop. IC Role / Device Role / Timing Role: Final-stage thermal guard with fixed 115°C trip; OS output interrupts main power MOSFET gate or triggers crowbar circuit. Use Value: UL recognition simplifies end-product safety compliance; SOT-23 footprint minimizes PCB area in space-constrained designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermostat applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM26CIM5-XPA/NOPB | Fixed 105°C trip point; identical pinout, output type, and hysteresis options. | Suitable for lower-temperature shutdown thresholds in power converters or battery packs. | Select when system thermal margin requires earlier intervention than 115°C. |
| LM26CIM5-VPA/NOPB | Fixed 95°C trip point; same SOT-23 package, VTEMP functionality, and supply range. | Preferred for microcontroller thermal throttling or fan start-up control in mid-range temperature envelopes. | Choose for applications needing tighter thermal headroom before critical failure. |
Compared with LM26CIM5-YPA/NOPB, LM26CIM5-XPA/NOPB and LM26CIM5-VPA/NOPB offer lower trip points (105°C and 95°C) while preserving identical electrical interface, hysteresis control, and VTEMP diagnostics-enabling drop-in replacement with only trip point revalidation required.
Availability
LM26CIM5-YPA/NOPB is available at Aetrix Electronics and suitable for microprocessor thermal management, fan control, industrial process control, electronic system protection, and HVAC systems requiring stable component supply and long-term lifecycle support.
Supply support for LM26CIM5-YPA/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 reliable, low-power thermal protection in space-constrained applications-designed specifically for embedded thermal shutdown, system health monitoring, and after-assembly validation.
FAQ
What is the exact trip temperature of LM26CIM5-YPA/NOPB and how is it verified?
The LM26CIM5-YPA/NOPB has a factory-preset overtemperature shutdown trip point of 115°C, confirmed in the Device Comparison Table of the SNIS115S datasheet. Trip accuracy is ±3°C over −55°C to +110°C ambient, including contributions from internal reference, DAC, comparator offset, and temperature sensitivity errors. This specification is guaranteed per TI's AOQL testing and applies across the full operating temperature range.
Does LM26CIM5-YPA/NOPB require external components to operate as a thermostat?
No, LM26CIM5-YPA/NOPB requires no external components for basic thermostat operation. Its internal temperature sensor, reference, DAC, and comparator are fully integrated. Only a 0.1 µF bypass capacitor on V+ and a ≥10 kΩ pullup resistor on the OS pin are recommended for robust performance. The HYST pin can be tied directly to GND or V+ to select hysteresis-no additional resistors are needed unless noise immunity is required.
How does the VTEMP pin function in LM26CIM5-YPA/NOPB and what design precautions apply?
The VTEMP pin on LM26CIM5-YPA/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, with −10.82 mV/°C slope. It supports after-assembly testing and system-level temperature readback. Due to weak drive capability (1 µA source / 40 µA sink), avoid direct connection to low-impedance nodes; use a series resistor (e.g., 8.2 kΩ for 1 nF load) to prevent oscillation under capacitive loading.
Can LM26CIM5-YPA/NOPB be used for undertemperature detection?
No, LM26CIM5-YPA/NOPB is factory-programmed exclusively for overtemperature shutdown (OS) with active-low open-drain output. It does not support undertemperature (US) functionality. The Device Comparison Table confirms LM26CIM5-YPA/NOPB is configured as "Active-Low, Open-Drain, OS output" with 115°C trip point. For undertemperature applications, consider LM26CIM5-BPB (−45°C US) or other US-configured variants.
What is the power supply rejection capability of LM26CIM5-YPA/NOPB?
LM26CIM5-YPA/NOPB exhibits excellent power supply noise rejection: false triggering was not observed when injecting 400 kHz square wave (1 Vp-p), 2 kHz square wave (200 mVp-p), or 100 Hz–1 MHz sine wave (200 mVp-p) onto the V+ pin. Testing was performed with the device held 1°C below its 115°C trip point and output inactive, confirming robust operation in electrically noisy environments such as motor drives or switching power supplies.
LM26CIM5-YPA/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:
- 115°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-YPA/NOPB FAQ
1.How can I place an order for LM26CIM5-YPA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26CIM5-YPA/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-YPA/NOPB reliable?
The price and inventory of LM26CIM5-YPA/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-YPA/NOPB is usually 5 days.
3.What payment methods are accepted for LM26CIM5-YPA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26CIM5-YPA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26CIM5-YPA/NOPB?
LM26CIM5-YPA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26CIM5-YPA/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-YPA/NOPB?
For technical support, including LM26CIM5-YPA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26CIM5-YPA/NOPB requirements.
6.How does Aetrix verify that LM26CIM5-YPA/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26CIM5-YPA/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-YPA/NOPB meets industry standards.
7.What is the process for return or replacement of LM26CIM5-YPA/NOPB?
All LM26CIM5-YPA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26CIM5-YPA/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-YPA/NOPB part is unused and in its original packaging.
Return procedure for LM26CIM5-YPA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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