Texas Instruments LM26CIM5X-YPE/NOPB

Overview

LM26CIM5X-YPE/NOPB from Texas Instruments is a factory-preset, ±3°C accurate digital-output thermostat in SOT-23-5 package, with fixed 85°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 for microprocessor thermal protection and fan control.

For engineers reviewing the LM26CIM5X-YPE/NOPB datasheet, LM26CIM5X-YPE/NOPB pinout, LM26CIM5X-YPE/NOPB application, or LM26CIM5X-YPE/NOPB equivalent, key selection criteria include trip accuracy (±3°C), hysteresis configurability (2°C or 10°C), VTEMP analog output slope (−10.82 mV/°C), supply current (16 µA typical), and open-drain output compatibility with CMOS logic and interrupt controllers.

Technical Context

The LM26CIM5X-YPE/NOPB implements a precision analog temperature sensing front-end feeding an internal comparator with factory-trimmed DAC-based reference. Its trip point is fixed at 85°C and cannot be adjusted post-manufacture. The comparator output drives an open-drain MOSFET stage, requiring external pull-up for logic-level compatibility.

Hysteresis is implemented digitally by shifting the internal reference voltage-by either 2°C (HYST = V+) or 10°C (HYST = GND)-to prevent output oscillation near threshold. The VTEMP pin provides a calibrated analog voltage following VO = (−3.479 × 10⁻⁶ × (T − 30)²) + (−1.082 × 10⁻² × (T − 30)) + 1.8015 V, enabling post-assembly validation and system-level temperature monitoring.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package, 2.90 mm × 1.60 mm body size, with exposed thermal pad not electrically connected. Pin 2 (GND) thermally couples to die backside for accurate lead-temperature sensing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar thermostat applications.

Compared with LM26CIM5X-YPE/NOPB, LM26CIM5-TPA offers identical performance in non-RoHS environments, while MAX6505UTA+T sacrifices accuracy and diagnostic capability for lower unit cost-making it viable only for cost-driven, functionally minimal thermal cutoffs.

Availability

LM26CIM5X-YPE/NOPB is available at Aetrix Electronics and suitable for microprocessor thermal management, fan control, portable battery-powered systems, and industrial process control requiring stable component supply across extended product lifecycles.

Supply support for LM26CIM5X-YPE/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 designing analog and embedded processing chips for industrial, automotive, and consumer applications.

The LM26 series was developed as a precision, single-chip thermostat family targeting thermal protection in space-constrained, low-power systems-emphasizing factory-set accuracy, zero-component operation, and post-assembly testability via VTEMP.

FAQ

What is the exact trip temperature and hysteresis behavior of the LM26CIM5X-YPE/NOPB?

The LM26CIM5X-YPE/NOPB has a factory-programmed trip point of exactly 85°C. When temperature rises above 85°C, the OS output goes low. It returns high only after temperature falls to (85°C − THYST). THYST is 2°C if HYST pin is connected to V+, or 10°C if HYST is grounded. This behavior is confirmed in TI's SNIS115S datasheet Section 7.5 and Figure 8.

Can the LM26CIM5X-YPE/NOPB be used without external components?

Yes-the LM26CIM5X-YPE/NOPB operates fully functional with only a 0.1 µF ceramic bypass capacitor on the V+ pin. No resistors, thermistors, or external references are needed. This is explicitly stated in the "Features" section of the SNIS115S datasheet and verified in the Typical Application schematics (Figures 8–13).

How does the VTEMP pin function, and what is its practical design value in the LM26CIM5X-YPE/NOPB?

The VTEMP pin outputs a voltage proportional to temperature per VO = (−3.479 × 10⁻⁶ × (T − 30)²) + (−1.082 × 10⁻² × (T − 30)) + 1.8015 V. Its primary design value is enabling after-assembly PCB testing: by forcing VTEMP to ground, engineers can verify OS toggles correctly-confirming full signal chain integrity (sensor → DAC → comparator → output) without thermal chamber cycling. This is detailed in Section 8.4.1 of the datasheet.

Is the LM26CIM5X-YPE/NOPB RoHS-compliant and lead-free?

Yes-the /NOPB suffix in LM26CIM5X-YPE/NOPB explicitly denotes "No Lead (Pb)-Free" and RoHS-compliant packaging per TI's official part numbering convention. This is confirmed in TI's LM26 orderable addendum and packaging documentation (SLYY001).

What is the maximum allowable load on the OS output of the LM26CIM5X-YPE/NOPB?

The OS output is rated to sink ≥1.2 mA at VO = 0.4 V (per Section 7.5 Electrical Characteristics). For reliable operation, use a pull-up resistor ≥10 kΩ to V+. At 5.5 V supply, this limits sink current to ≤550 µA-well within spec and minimizing self-heating (<0.11°C junction rise per Table 3). Exceeding 3.2 mA risks exceeding absolute max ratings and degrading trip accuracy.