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Texas Instruments LM27CIM5-1HJ/NOPB
- Part No.:
- LM27CIM5-1HJ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM27CIM5-1HJ/NOPB.pdf
- Description:
- THERMOSTAT 130DEG ACT LO SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,524
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Product details
Overview
LM27CIM5-1HJ/NOPB from Texas Instruments is a factory-preset, ±3°C accurate digital thermostat IC with 130°C overtemperature shutdown trip point, open-drain active-low OS output, and selectable 2°C/10°C hysteresis via HYST pin. It integrates precision temperature sensing, internal voltage reference, DAC, and comparator in a single SOT-23-5 package for thermal protection of power stages and microprocessors.
For engineers reviewing the LM27CIM5-1HJ/NOPB datasheet, LM27CIM5-1HJ/NOPB pinout, LM27CIM5-1HJ/NOPB application, or LM27CIM5-1HJ/NOPB equivalent, key selection criteria include trip point accuracy (±3°C max), VTEMP analog output linearity (−10.82 mV/°C), supply current (15 µA typ), hysteresis configurability, and open-drain output compatibility with CMOS logic levels.
Technical Context
The LM27CIM5-1HJ/NOPB implements a monolithic temperature-sensing architecture with an internal bandgap reference, 12-bit DAC for trip-point programming, and rail-to-rail comparator driving an open-drain output stage. Its VTEMP pin delivers a quadratic voltage-vs-temperature transfer function defined by VO = (−3.552×10⁻⁶×(T−30)²) + (−10.69576×10⁻³×(T−30)) + 1.8386 V.
Hysteresis is digitally selected: HYST = GND yields 10°C typical hysteresis; HYST = V+ yields 2°C typical hysteresis. The device operates across full industrial temperature range (−40°C to +150°C ambient) with 2.7V–5.5V supply and exhibits >60 dB PSRR against 100Hz–1MHz noise on V+.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Trip Point Temperature | 130°C - factory-programmed fixed overtemperature shutdown threshold; no external adjustment required. |
| Trip Accuracy | ±3°C (max) - ensures reliable thermal margin for safety-critical shutdown without calibration. |
| Supply Voltage Range | 2.7V to 5.5V - supports direct connection to common logic rails (3.3V, 5V) with 0.1µF bypass capacitor. |
| Quiescent Current | 15 µA (typ), 40 µA (max) - enables always-on thermal monitoring in battery-powered systems. |
| VTEMP Output Slope | −10.82 mV/°C - enables post-assembly board-level temperature verification using measured voltage. |
| Hysteresis Options | 2°C (HYST = V+) or 10°C (HYST = GND) - prevents output chatter near trip point under noisy thermal conditions. |
| Digital Output Type | Active-low open-drain OS - allows wired-OR configuration and flexible pull-up voltage selection (up to 5.5V). |
Pinout & Package
LM27CIM5-1HJ/NOPB is housed in a 5-pin SOT-23 (DBV) package with exposed thermal pad not electrically connected. Pin 1 (HYST) controls hysteresis; Pin 2 (GND) serves as thermal reference plane; Pin 3 (VTEMP) provides analog temperature voltage; Pin 4 (V+) supplies power; Pin 5 (OS) delivers open-drain overtemperature alert.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - HYST | Digital input | Selects hysteresis: GND = 10°C, V+ = 2°C; must be driven to valid logic level before operation. |
| 2 - GND | Ground reference | Connected to die backside; establishes thermal baseline and electrical return path for all internal circuits. |
| 3 - VTEMP | Analog output | Quadratic voltage proportional to die temperature; weak drive (1 µA source / 40 µA sink); requires high-Z load. |
| 4 - V+ | Power supply | 2.7V–5.5V input; bypass capacitor mandatory; powers internal reference, DAC, sensor, and comparator. |
| 5 - OS | Digital output | Open-drain active-low overtemperature signal; requires external pull-up resistor ≥10 kΩ to system rail. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Full thermostat functionality-including reference, DAC, sensor, comparator, and output-integrated into single SOT-23-5 IC. |
| VTEMP-enabled after-assembly test | Voltage output allows functional verification of sensor, DAC, and comparator without thermal chamber or heating. |
| Factory-programmed trip point | 130°C setpoint laser-trimmed during manufacturing; eliminates field calibration and reduces BOM count. |
| High PSRR noise immunity | Rejects 200 mVpp sine/square wave noise up to 1 MHz on V+ supply without false triggering. |
| Thermal mounting flexibility | GND pin thermally coupled to die backside; enables accurate PCB surface temperature sensing when soldered directly. |
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 overtemperature shutdown signal to processor reset controller or power management IC. Use Value: Ensures immediate system shutdown at precisely 130°C with ±3°C accuracy, preventing silicon degradation during sustained overload. |
Use Scenario: Controls cooling fan speed in industrial motor drives based on heatsink temperature feedback. IC Role / Device Role / Timing Role: Overtemperature detector triggering fan activation via MOSFET gate driver when heatsink exceeds safe limit. Use Value: Enables simple two-speed fan control using open-drain OS output to pull down gate resistor network, reducing component count vs. analog solutions. |
| Industrial Process Control | Electronic System Protection |
|
Use Scenario: Protects PLC I/O modules from overheating due to ambient temperature rise or internal power dissipation. IC Role / Device Role / Timing Role: Standalone thermal watchdog asserting fault signal to system supervisor IC upon exceeding 130°C. Use Value: Provides fail-safe shutdown independent of main controller firmware, meeting SIL-2 functional safety requirements for thermal hazards. |
Use Scenario: Safeguards power supply units in telecom equipment against transformer or MOSFET thermal runaway. IC Role / Device Role / Timing Role: Directly interrupts primary-side PWM controller enable line via OS output during overtemperature event. Use Value: Achieves <100 ms response time from thermal excursion to shutdown, limiting energy dissipation and preventing catastrophic failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overtemperature shutdown applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM27CIM5-2HJ/NOPB | 140°C trip point (vs. 130°C); identical package, pinout, and electrical specs. | Suitable where higher thermal margin is needed before shutdown (e.g., high-ambient industrial enclosures). | Select when system thermal design requires later intervention; same layout and firmware integration. |
| MAX6505UTP130+T | 130°C trip, ±2.5°C accuracy, 3.0V–5.5V supply, push-pull output (not open-drain). | Lacks VTEMP analog output; requires different pull-up strategy and offers tighter accuracy but less flexibility. | Choose if push-pull output simplifies interface and ±2.5°C tolerance is critical; verify logic-level compatibility. |
Compared with LM27CIM5-1HJ/NOPB, LM27CIM5-2HJ/NOPB delays shutdown by 10°C for higher thermal headroom, while MAX6505UTP130+T trades VTEMP diagnostics and open-drain flexibility for improved accuracy and integrated push-pull drive.
Availability
LM27CIM5-1HJ/NOPB is available at Aetrix Electronics and suitable for microprocessor thermal management, fan control, industrial process control, electronic system protection, and HVAC thermal monitoring requiring stable component supply and long-term lifecycle support.
Supply support for LM27CIM5-1HJ/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 connectivity technologies with over 90 years of innovation in precision analog ICs.
The LM27 series was designed specifically for robust, low-power overtemperature protection in space-constrained applications, emphasizing factory-trimmed accuracy, minimal external components, and diagnostic capability via VTEMP.
FAQ
What is the exact trip temperature of LM27CIM5-1HJ/NOPB?
The LM27CIM5-1HJ/NOPB has a factory-programmed overtemperature shutdown trip point of exactly 130°C. This value is laser-trimmed during manufacturing and specified with a maximum error of ±3°C across −40°C to +150°C ambient temperature. The trip point cannot be adjusted externally and remains stable over time and supply voltage variations.
How does the HYST pin affect hysteresis in LM27CIM5-1HJ/NOPB?
In LM27CIM5-1HJ/NOPB, the HYST pin selects between two hysteresis values: connecting HYST to GND sets typical hysteresis to 10°C, while connecting HYST to V+ sets it to 2°C. This digital selection prevents output oscillation near the 130°C trip point under slow thermal transients or noise. The pin must be held at a valid logic level before power-up for correct initialization.
Can LM27CIM5-1HJ/NOPB be used for undertemperature detection?
No - LM27CIM5-1HJ/NOPB is factory-configured exclusively for overtemperature shutdown (OS) with a 130°C trip point. While the LM27 family includes US variants for undertemperature detection, the -1HJ suffix denotes active-low open-drain OS functionality only. For undertemperature applications, consider LM27CIM5-K variants or alternate devices.
What is the purpose of the VTEMP pin on LM27CIM5-1HJ/NOPB?
The VTEMP pin on LM27CIM5-1HJ/NOPB provides an analog voltage output that follows a precise quadratic function of die temperature: VO = (−3.552×10⁻⁶×(T−30)²) + (−10.69576×10⁻³×(T−30)) + 1.8386 V. It enables post-assembly verification of sensor functionality and permits calibrated temperature measurement when interfaced with a high-impedance ADC.
Is LM27CIM5-1HJ/NOPB RoHS compliant and lead-free?
Yes - LM27CIM5-1HJ/NOPB carries the /NOPB suffix indicating lead-free (Pb-free) construction and full compliance with EU RoHS Directive (10-substance restriction). It features green molding compound (≤1000 ppm Br/Cl), Sn (tin) lead finish, and meets JEDEC MSL Level-1 moisture sensitivity classification for standard reflow processes.
LM27CIM5-1HJ/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:
- 130°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
LM27CIM5-1HJ/NOPB FAQ
1.How can I place an order for LM27CIM5-1HJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM27CIM5-1HJ/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 LM27CIM5-1HJ/NOPB reliable?
The price and inventory of LM27CIM5-1HJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM27CIM5-1HJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM27CIM5-1HJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM27CIM5-1HJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM27CIM5-1HJ/NOPB?
LM27CIM5-1HJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM27CIM5-1HJ/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 LM27CIM5-1HJ/NOPB?
For technical support, including LM27CIM5-1HJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM27CIM5-1HJ/NOPB requirements.
6.How does Aetrix verify that LM27CIM5-1HJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM27CIM5-1HJ/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 LM27CIM5-1HJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM27CIM5-1HJ/NOPB?
All LM27CIM5-1HJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM27CIM5-1HJ/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 LM27CIM5-1HJ/NOPB part is unused and in its original packaging.
Return procedure for LM27CIM5-1HJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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