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Texas Instruments LM27CIM5-2HJ/NOPB
- Part No.:
- LM27CIM5-2HJ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM27CIM5-2HJ/NOPB.pdf
- Description:
- THERMOSTAT 140DEG ACT LO SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,675
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Product details
Overview
LM27CIM5-2HJ/NOPB from Texas Instruments is a factory-preset, ±3°C accurate digital thermostat IC with 140°C overtemperature shutdown trip point, open-drain active-low OS output, and analog VTEMP output (−10.82 mV/°C). It operates from 2.7V to 5.5V, draws only 15 µA typical supply current, and is housed in a 5-pin SOT-23 package for microprocessor thermal protection and fan control applications.
For engineers reviewing the LM27CIM5-2HJ/NOPB datasheet, LM27CIM5-2HJ/NOPB pinout, LM27CIM5-2HJ/NOPB application, or LM27CIM5-2HJ/NOPB equivalent, this page delivers verified trip-point accuracy, hysteresis configuration options (2°C/10°C), VTEMP calibration equation, thermal mounting guidance, and real-world fan control interface examples - all grounded in TI's SNIS124D revision C datasheet.
Technical Context
The LM27CIM5-2HJ/NOPB integrates a precision bandgap reference, DAC-based trip-point programming, and a monolithic temperature sensor with quadratic VTEMP output (VO = −3.552×10⁻⁶(T−30)² −10.69576×10⁻³(T−30) + 1.8386 V). Its comparator compares VTEMP against a factory-set threshold to drive the OS output.
Hysteresis is digitally selected via HYST pin: GND yields 10°C, V+ yields 2°C (typical). The open-drain OS output supports CMOS logic levels with ≤0.4 V low-state voltage at 1.2 mA sink, and requires an external ≥10 kΩ pull-up resistor for system interrupt signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Trip Point Temperature | 140°C factory preset; triggers OS LOW when die temperature exceeds 140°C, returns HIGH after cooling to 138°C (2°C hysteresis) or 130°C (10°C hysteresis). |
| Temperature Accuracy | ±3°C maximum error across −40°C to +150°C ambient; includes VREF, DAC, comparator offset, and sensor sensitivity errors. |
| VTEMP Output Slope | −10.82 mV/°C; enables post-assembly board-level temperature verification using measured voltage and TI's quadratic calibration equation. |
| Supply Voltage Range | 2.7V to 5.5V; supports direct connection to common logic rails; requires 0.1 µF bypass capacitor on V+ for noise immunity. |
| Quiescent Current | 15 µA typical / 40 µA maximum; enables always-on thermal monitoring in battery-powered systems without significant power penalty. |
| Hysteresis Selection | Digital input on HYST pin: connect to GND for 10°C hysteresis or to V+ for 2°C hysteresis - no external components needed. |
| Digital Output Type | Open-drain, active-low OS; compatible with 3.3V/5V CMOS logic; requires external pull-up for interrupt signaling to MCU or power controller. |
Pinout & Package
LM27CIM5-2HJ/NOPB uses the industry-standard 5-pin SOT-23 (DBV) package with 1.45 mm max height, JEDEC MO-178 compliant footprint, and exposed metal pad for thermal conduction to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - HYST | Hysteresis control input | Digital select: GND → 10°C hysteresis; V+ → 2°C hysteresis; defines thermal recovery margin before OS deasserts. |
| 2 - GND | Ground reference & thermal path | Connected directly to die backside; provides primary thermal conduction path to PCB; must be tied to system ground. |
| 3 - VTEMP | Analog temperature-sensing output | Quadratic voltage output proportional to die temperature; weak drive (1 µA source / 40 µA sink); used for calibration and functional test. |
| 4 - V+ | Positive supply input | 2.7V–5.5V operation; requires local 0.1 µF ceramic bypass capacitor; PSRR rejects up to 200 mVp-p 100 Hz–1 MHz noise. |
| 5 - OS | Overtemperature shutdown output | Open-drain, active-low; sinks ≥1.2 mA at V+ ≥2.7V; drives MCU interrupt or MOSFET gate via ≥10 kΩ pull-up; asserts at 140°C. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed trip point | 140°C set at wafer level; eliminates external resistors or trimming; ensures repeatable, production-ready thermal shutdown behavior. |
| VTEMP-enabled after-assembly test | Allows full functional verification of sensor, DAC, and comparator on assembled PCB by forcing VTEMP and observing OS state transitions. |
| No external components required | Self-contained thermostat: internal reference, DAC, sensor, and comparator eliminate BOM count, layout area, and calibration labor. |
| High PSRR architecture | Rejects 400 kHz square-wave (1 Vp-p) and 100 Hz–1 MHz sine-wave (200 mVp-p) noise on V+, preventing false trips in noisy power environments. |
| SOT-23 thermal mounting flexibility | GND pin bonded to die backside enables direct thermal coupling to PCB copper; achieves <±0.06°C error vs. surface temperature when properly mounted. |
Applications
| Microprocessor Thermal Management | Fan Speed Control |
|---|---|
|
Use Scenario: Monitors CPU die temperature in embedded computing modules to prevent thermal throttling or permanent damage during sustained load. IC Role / Device Role / Timing Role: Digital thermostat providing overtemperature shutdown signal to system power controller or host MCU interrupt line. Use Value: Triggers immediate OS LOW at precisely 140°C (±3°C), enabling deterministic thermal shutdown before silicon reliability limits are exceeded. |
Use Scenario: Controls two-speed fan operation in industrial controllers: slow speed at normal temperature, high speed when junction exceeds 140°C. IC Role / Device Role / Timing Role: Overtemperature event detector driving N-channel MOSFET gate via open-drain OS output and pull-up resistor. Use Value: Eliminates need for analog comparators and thermistors; reduces component count while maintaining ±3°C trip accuracy and configurable hysteresis. |
| Portable Battery-Powered Systems | Industrial Process Control |
|
Use Scenario: Protects Li-ion battery packs and charging circuits from thermal runaway during fast-charge cycles in handheld medical devices. IC Role / Device Role / Timing Role: Low-power thermal watchdog with 15 µA quiescent current, asserting OS to disable charge FET when cell temperature reaches 140°C. Use Value: Extends battery runtime by minimizing standby current; VTEMP output allows factory calibration verification without thermal chambers. |
Use Scenario: Safeguards motor drives and PLC I/O modules against overheating in enclosed cabinets with limited airflow. IC Role / Device Role / Timing Role: Standalone thermal cutoff device interfacing directly with 24V DC control logic via optocoupler or level-shifting transistor. Use Value: Provides fail-safe shutdown independent of firmware; ±3°C accuracy ensures compliance with IEC 61800-5-1 thermal class requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overtemperature shutdown applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM27CIM5-1HJ/NOPB | 130°C trip point (10°C lower); identical pinout, package, and electrical specs. | Suitable for systems requiring earlier thermal intervention, e.g., lower-Tj MOSFET protection or tighter safety margins. | Select when 130°C shutdown aligns with system thermal design; no PCB or firmware changes needed. |
| LM27CIM5-ZHJ/NOPB | 120°C trip point (20°C lower); same SOT-23-5 DBV package and open-drain OS functionality. | Preferred for cost-sensitive consumer appliances where lower trip thresholds reduce thermal stress on plastic enclosures. | Choose for legacy designs migrating from 120°C setpoint; maintains identical interface and layout compatibility. |
Compared with LM27CIM5-2HJ/NOPB, the 130°C and 120°C variants provide earlier thermal warning points while preserving identical hysteresis selection, VTEMP calibration, and low-power operation - enabling scalable thermal protection across product families without redesigning the sensing interface.
Availability
LM27CIM5-2HJ/NOPB is available at Aetrix Electronics and suitable for microprocessor thermal management, fan control, and portable battery-powered systems requiring stable component supply and guaranteed long-term availability.
Supply support for LM27CIM5-2HJ/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 leader specializing in analog, embedded processing, and high-reliability ICs, with decades of expertise in precision temperature sensing and power management solutions.
The LM27 series is part of TI's precision thermal protection portfolio, designed specifically for factory-programmable, single-chip overtemperature shutdown in space-constrained, high-reliability applications such as computing, industrial automation, and portable electronics.
FAQ
What is the exact trip point temperature of LM27CIM5-2HJ/NOPB?
The LM27CIM5-2HJ/NOPB has a factory-programmed overtemperature shutdown trip point of exactly 140°C. This value is laser-trimmed during manufacturing and specified with ±3°C maximum accuracy across −40°C to +150°C ambient temperature. The trip point is fixed and cannot be adjusted externally - it is defined by the "2HJ" suffix per TI's part numbering scheme.
How does the HYST pin configure hysteresis on LM27CIM5-2HJ/NOPB?
On LM27CIM5-2HJ/NOPB, the HYST pin selects hysteresis magnitude: connecting HYST to GND sets 10°C hysteresis (OS returns HIGH at 130°C), while connecting HYST to V+ sets 2°C hysteresis (OS returns HIGH at 138°C). This digital selection requires no resistors or timing components and directly controls the comparator's feedback threshold within the IC.
Can LM27CIM5-2HJ/NOPB be used for undertemperature detection?
No - LM27CIM5-2HJ/NOPB is factory-configured exclusively for overtemperature shutdown (OS function). The "2HJ" suffix denotes active-low open-drain OS output with 140°C trip point. Undertemperature variants (e.g., US output) use different suffixes like "K" or "N"; LM27CIM5-2HJ/NOPB lacks internal US functionality and cannot be reconfigured.
What is the purpose of the VTEMP pin on LM27CIM5-2HJ/NOPB?
The VTEMP pin on LM27CIM5-2HJ/NOPB provides an analog voltage output proportional to die temperature, following VO = −3.552×10⁻⁶(T−30)² −10.69576×10⁻³(T−30) + 1.8386 V. It enables post-assembly functional testing, calibration verification, and non-intrusive temperature monitoring without requiring external sensors or ADC resources.
Is LM27CIM5-2HJ/NOPB RoHS-compliant and lead-free?
Yes - LM27CIM5-2HJ/NOPB is RoHS-compliant and lead-free, as confirmed by TI's packaging documentation. It carries the "/NOPB" suffix, indicating Green (RoHS & no Sb/Br) material content, Sn (tin) lead finish, and JEDEC Level-1 moisture sensitivity rating (260°C peak reflow). Full compliance data is available in TI's PACKAGE OPTION ADDENDUM.
LM27CIM5-2HJ/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:
- 140°C
- Accuracy:
- ±3°C
- Current - Output (Max):
- -
- Output Type:
- Open Drain
- Output:
- Active Low
- Output Function:
- /OverTemp, VTemp
- Selectable Hysteresis:
- Yes
- Features:
- -
- Voltage - Supply:
- 2.7 V ~ 5.5 V
- Current - Supply:
- 15µA
- Operating Temperature:
- -40°C ~ 150°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-23-5
LM27CIM5-2HJ/NOPB FAQ
1.How can I place an order for LM27CIM5-2HJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM27CIM5-2HJ/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 LM27CIM5-2HJ/NOPB reliable?
The price and inventory of LM27CIM5-2HJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM27CIM5-2HJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM27CIM5-2HJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM27CIM5-2HJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM27CIM5-2HJ/NOPB?
LM27CIM5-2HJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM27CIM5-2HJ/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 LM27CIM5-2HJ/NOPB?
For technical support, including LM27CIM5-2HJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM27CIM5-2HJ/NOPB requirements.
6.How does Aetrix verify that LM27CIM5-2HJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM27CIM5-2HJ/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 LM27CIM5-2HJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM27CIM5-2HJ/NOPB?
All LM27CIM5-2HJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM27CIM5-2HJ/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 LM27CIM5-2HJ/NOPB part is unused and in its original packaging.
Return procedure for LM27CIM5-2HJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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