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Texas Instruments LM27CIM5X-ZHJ/NOPB
- Part No.:
- LM27CIM5X-ZHJ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM27CIM5X-ZHJ/NOPB.pdf
- Description:
- THERMOSTAT 120DEG ACT LO SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,531
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Product details
Overview
LM27CIM5X-ZHJ/NOPB from Texas Instruments is a factory-preset, ±3°C accurate digital thermostat IC with open-drain active-low OS output, 120°C trip point, and integrated temperature sensor delivering VTEMP analog output (−10.82 mV/°C). It operates from 2.7V to 5.5V, draws only 15 µA typical supply current, and is used for overtemperature shutdown in microprocessor thermal management and fan control circuits.
For engineers reviewing the LM27CIM5X-ZHJ/NOPB datasheet, LM27CIM5X-ZHJ/NOPB pinout, LM27CIM5X-ZHJ/NOPB application, or LM27CIM5X-ZHJ/NOPB equivalent, key selection considerations include trip point accuracy (±3°C max), selectable 2°C/10°C hysteresis via HYST pin, VTEMP slope (−10.82 mV/°C), SOT-23-5 package compatibility, and open-drain output drive capability (1.2 mA sink at 0.4 V).
Technical Context
The LM27CIM5X-ZHJ/NOPB integrates a precision bandgap reference, DAC-based trip-point setting, and comparator with internal temperature sensing. Its VTEMP output follows a quadratic equation: VTEMP = (−3.552×10⁻⁶×(T−30)²) + (−10.69576×10⁻³×(T−30)) + 1.8386 V, enabling post-assembly calibration verification.
Hysteresis is digitally selected: HYST = GND yields 10°C typical hysteresis; HYST = V+ yields 2°C typical hysteresis. The OS output is factory-programmed as active-low, open-drain, and asserts LOW when die temperature exceeds 120°C (TOS), releasing HIGH after cooling below (120°C − THYST).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7 V to 5.5 V - supports single-supply operation across common logic rails with 0.1 µF bypass capacitor required. |
| Supply Current | 15 µA typical, 40 µA max - enables ultra-low-power thermal monitoring in battery-powered systems. |
| Temperature Trip Point | 120°C ±3°C max - factory-trimmed for precise overtemperature detection in CPU/GPU thermal protection. |
| Hysteresis | 2°C or 10°C typical - selectable via HYST pin to prevent chatter near trip point under noisy thermal conditions. |
| VTEMP Output Slope | −10.82 mV/°C - provides calibrated analog voltage proportional to die temperature for system-level validation. |
| Digital Output Type | Open-drain, active-low OS - requires external pull-up; sinks ≥1.2 mA at 0.4 V for direct interface with MCU interrupt or power controller. |
| Package | SOT-23-5 (DBV) - surface-mount, 2.9 mm × 1.6 mm footprint with exposed thermal pad; JEDEC MO-178 compliant. |
Pinout & Package
SOT-23-5 plastic package (DBV), 2.9 mm × 1.6 mm × 1.45 mm height, with lead-free (Sn) finish and RoHS-compliant green material. Pin 2 (GND) connects directly to die backside for optimal thermal coupling.
| 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 trip event. |
| 2 - GND | Ground reference | Die backside connected to lead frame; primary thermal path to PCB; must be low-impedance system ground. |
| 3 - VTEMP | Analog output | Quadratic voltage vs. temperature (−10.82 mV/°C slope); max 1 µA source / 40 µA sink; requires high-Z load or series R for capacitive loads. |
| 4 - V+ | Power supply | 2.7–5.5 V input; PSRR ensures immunity to 400 kHz square-wave noise on supply rail. |
| 5 - OS | Digital output | Active-low, open-drain overtemperature shutdown signal; requires ≥10 kΩ pull-up; asserts LOW at T ≥ 120°C. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Full thermostat functionality (reference, DAC, sensor, comparator, output) integrated into single SOT-23-5 IC. |
| VTEMP-enabled after-assembly testing | VTEMP output allows functional verification of sensor, DAC, and comparator without thermal chamber - measure voltage, calculate T, force trigger. |
| Factory-programmable trip point | 120°C set point laser-trimmed during manufacture; eliminates field calibration and reduces BOM count. |
| High PSRR | Immune to 1 Vpp 400 kHz square-wave noise on V+, preventing false trips in electrically noisy environments like motor drives or SMPS. |
| Thermal mounting flexibility | GND-pin thermal conduction enables direct attachment to heatsink or PCB copper; measures board temperature within ±0.06°C of lead attachment point. |
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 system power controller or host MCU interrupt line. Use Value: 120°C trip point with ±3°C accuracy ensures reliable protection before silicon degradation begins; open-drain OS output interfaces directly with 3.3 V or 5 V logic. |
Use Scenario: Controls two-speed fan in industrial HVAC unit based on heatsink temperature rise. IC Role / Device Role / Timing Role: Overtemperature detector triggering fan speed increase when heatsink reaches critical threshold. Use Value: 10°C hysteresis (HYST = GND) prevents rapid fan cycling near trip point; low 15 µA quiescent current minimizes standby power impact. |
| Portable Battery-Powered Systems | Industrial Process Control |
Use Scenario: Protects Li-ion battery pack during fast charging by halting charge if cell temperature exceeds safe limit. IC Role / Device Role / Timing Role: Standalone thermal cutoff with VTEMP output used for both safety shutdown and real-time temperature telemetry. Use Value: Quadratic VTEMP equation enables accurate temperature readback without external ADC; 2.7 V minimum supply supports operation down to depleted battery voltage. |
Use Scenario: Safeguards PLC I/O module against overheating due to ambient temperature rise or internal fault conditions. IC Role / Device Role / Timing Role: Factory-set 120°C watchdog for enclosure temperature, asserting OS to disable outputs and log fault. Use Value: ±3°C trip accuracy ensures compliance with IEC 61000-6-4 thermal safety margins; SOT-23-5 package fits tight board space constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital thermostat applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM27CIM5-1HJ/NOPB | 130°C trip point (vs. 120°C); identical SOT-23-5 package, pinout, and electrical specs. | Used where higher thermal margin is needed before shutdown, e.g., in high-ambient industrial enclosures. | Select when system thermal design requires later intervention; no PCB changes needed but trip behavior differs. |
| LM57CIMM-3/NOPB | Adjustable trip point (−55°C to +130°C) via external resistor; includes ALERT and OT outputs; 6-pin WSON package. | Supports dual-threshold (over/under) monitoring and programmable hysteresis; requires external component. | Choose when flexibility outweighs simplicity; not drop-in - different pin count, footprint, and configuration method. |
Compared with LM27CIM5X-ZHJ/NOPB, LM27CIM5-1HJ/NOPB offers identical functionality at a higher trip point, while LM57CIMM-3/NOPB trades fixed simplicity for field-adjustability and dual-output capability - requiring layout revision and calibration effort.
Availability
LM27CIM5X-ZHJ/NOPB is available at Aetrix Electronics and suitable for microprocessor thermal management, fan control, and portable battery-powered systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for LM27CIM5X-ZHJ/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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer applications.
The LM27 series is part of TI's precision analog temperature sensing portfolio, engineered specifically for factory-programmed, low-power, single-threshold thermal protection in space-constrained systems.
FAQ
What is the exact trip temperature and accuracy of the LM27CIM5X-ZHJ/NOPB?
The LM27CIM5X-ZHJ/NOPB has a factory-preset overtemperature trip point of 120°C with a maximum accuracy of ±3°C across −40°C to +150°C ambient. This specification includes errors from the internal voltage reference, DAC, comparator offset, and temperature sensitivity - verified per TI's SNIS124D datasheet Electrical Characteristics table.
How does the HYST pin affect hysteresis behavior in the LM27CIM5X-ZHJ/NOPB?
In the LM27CIM5X-ZHJ/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 occurs before the trip event and determines the temperature window (TOS − THYST) required for OS output deassertion, preventing oscillation near the threshold.
Can the LM27CIM5X-ZHJ/NOPB be used for undertemperature detection?
No - the LM27CIM5X-ZHJ/NOPB is factory-programmed exclusively for overtemperature shutdown (OS) with a 120°C trip point. While the LM27 family includes US variants (e.g., LM27CIM5-Kxx), the ZHJ suffix denotes active-low OS output only. For undertemperature detection, a different variant such as LM27CIM5-ZKJ/NOPB would be required.
What is the purpose and loading limit of the VTEMP pin on the LM27CIM5X-ZHJ/NOPB?
The VTEMP pin on the LM27CIM5X-ZHJ/NOPB provides an analog voltage proportional to die temperature, following a quadratic equation. It sources ≤1 µA and sinks ≤40 µA - exceeding these limits causes significant error. Capacitive loads >100 pF require series resistance (e.g., 8.2 kΩ for 1 nF) to prevent oscillation, as specified in the VTEMP Loading section of the datasheet.
Is the LM27CIM5X-ZHJ/NOPB pin-compatible with other LM27 variants in SOT-23-5 package?
Yes - all LM27 variants in the SOT-23-5 (DBV) package, including LM27CIM5X-ZHJ/NOPB, share identical pinout, footprint, and electrical interface. Pin 1 (HYST), Pin 2 (GND), Pin 3 (VTEMP), Pin 4 (V+), and Pin 5 (OS) perform the same functions across the family; only trip point and output logic are factory-programmed differences.
LM27CIM5X-ZHJ/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:
- 120°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
LM27CIM5X-ZHJ/NOPB FAQ
1.How can I place an order for LM27CIM5X-ZHJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM27CIM5X-ZHJ/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 LM27CIM5X-ZHJ/NOPB reliable?
The price and inventory of LM27CIM5X-ZHJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM27CIM5X-ZHJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM27CIM5X-ZHJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM27CIM5X-ZHJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM27CIM5X-ZHJ/NOPB?
LM27CIM5X-ZHJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM27CIM5X-ZHJ/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 LM27CIM5X-ZHJ/NOPB?
For technical support, including LM27CIM5X-ZHJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM27CIM5X-ZHJ/NOPB requirements.
6.How does Aetrix verify that LM27CIM5X-ZHJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM27CIM5X-ZHJ/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 LM27CIM5X-ZHJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM27CIM5X-ZHJ/NOPB?
All LM27CIM5X-ZHJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM27CIM5X-ZHJ/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 LM27CIM5X-ZHJ/NOPB part is unused and in its original packaging.
Return procedure for LM27CIM5X-ZHJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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