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Texas Instruments LM26CIM5-PHA/NOPB
- Part No.:
- LM26CIM5-PHA/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM26CIM5-PHA/NOPB.pdf
- Description:
- THERMOSTAT 50DEGC ACT LO SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:359
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Product details
Overview
LM26CIM5-PHA/NOPB from Texas Instruments is a factory-preset, ±3°C accurate digital-output thermostat in 5-pin SOT-23 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 thermal protection in microprocessor systems and fan control.
For engineers reviewing the LM26CIM5-PHA/NOPB datasheet, LM26CIM5-PHA/NOPB pinout, LM26CIM5-PHA/NOPB application, or LM26CIM5-PHA/NOPB equivalent, key selection criteria include trip accuracy (±3°C), VTEMP analog output slope (−10.82 mV/°C), supply current (16 µA typical), hysteresis configurability, and SOT-23 thermal coupling capability.
Technical Context
The LM26CIM5-PHA/NOPB implements a monolithic temperature-sensing architecture with an internal NTC-based sensor feeding a precision comparator referenced to a factory-trimmed DAC. Its trip point is permanently set to 85°C during manufacturing and cannot be adjusted externally.
Hysteresis is controlled solely by the logic level on the HYST pin: GND selects 10°C, V+ selects 2°C. The VTEMP pin provides a calibrated analog voltage output governed by VO = (−3.479 × 10⁻⁶ × (T − 30)²) + (−1.082 × 10⁻² × (T − 30)) + 1.8015 V, enabling post-assembly verification and system-level temperature monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Trip Point (TOS) | Fixed at 85°C - triggers OS low when die temperature exceeds this threshold. |
| Trip Accuracy | ±3°C over −55°C to +110°C - ensures reliable thermal shutdown within defined margin. |
| Hysteresis Options | 2°C (HYST = V+) or 10°C (HYST = GND) - prevents output oscillation near trip point. |
| VTEMP Slope | −10.82 mV/°C - enables direct temperature calculation using external ADC. |
| Supply Voltage Range | 2.7 V to 5.5 V - compatible with common low-voltage embedded rails including 3.3 V and 5 V. |
| Quiescent Current | 16 µA typical - minimizes power impact in battery-powered or always-on thermal monitoring. |
| Digital Output Type | Open-drain, active-low OS - requires external pull-up; interfaces directly with MCU interrupt or enable pins. |
Pinout & Package
LM26CIM5-PHA/NOPB is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, with thermal pad connected internally to GND (pin 2) for enhanced heat transfer from die to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - HYST | Digital input | Selects hysteresis: GND = 10°C, V+ = 2°C; input leakage <10 µA allows simple resistor biasing. |
| 2 - GND | Power ground | Connected to die backside; primary thermal path to PCB; must be low-impedance to system ground. |
| 3 - VTEMP | Analog output | Temperature-proportional voltage (−10.82 mV/°C); weak drive (1 µA source / 40 µA sink); requires high-Z load or series R for capacitive stability. |
| 4 - V+ | Power supply | 2.7–5.5 V input; requires 0.1 µF bypass capacitor close to pin for noise immunity and stable operation. |
| 5 - OS | Digital output | Open-drain, active-low overtemperature shutdown signal; requires ≥10 kΩ pull-up; sinks up to 3.2 mA. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-preset 85°C trip point | Eliminates external calibration or trimming components; guarantees consistent thermal response across production units. |
| VTEMP analog output | Enables after-assembly functional test by forcing VTEMP to verify OS transition, confirming full signal chain integrity without thermal chamber. |
| Programmable hysteresis | Two discrete hysteresis values (2°C or 10°C) selected via single logic-level pin - adapts to system noise and thermal ramp rate without redesign. |
| No external components required | Self-contained sensing and decision circuitry - reduces BOM count, layout area, and qualification effort versus discrete thermistor + comparator solutions. |
| UL recognition | Meets UL 1459/60950-1 requirements - supports safety-critical thermal protection in certified end equipment without additional isolation or redundancy. |
Applications
| Microprocessor Thermal Management | Fan Control |
|---|---|
|
Use Scenario: Monitors CPU die temperature in laptops or embedded controllers to prevent thermal throttling or permanent damage. IC Role / Device Role / Timing Role: Digital thermostat providing overtemperature shutdown signal to processor reset or power management IC. Use Value: ±3°C trip accuracy ensures shutdown occurs before silicon reliability limits are exceeded; 85°C setting aligns with common x86/ARM thermal spec thresholds. |
Use Scenario: Controls two-speed cooling fan in industrial power supplies or network switches based on heatsink temperature. IC Role / Device Role / Timing Role: Temperature switch driving MOSFET gate or fan enable line to activate high-speed mode above 85°C. Use Value: Open-drain OS output directly interfaces with logic-level MOSFET drivers; programmable hysteresis avoids fan chatter during slow thermal transients. |
| Portable Battery-Powered Systems | Industrial Process Control |
|
Use Scenario: Protects Li-ion battery packs or charging circuits from overheating during fast-charge cycles in handheld medical devices. IC Role / Device Role / Timing Role: Low-power thermal cutoff that disables charge path when cell temperature exceeds safe limit. Use Value: 16 µA typical supply current extends battery life; SOT-23 footprint minimizes board space in compact enclosures. |
Use Scenario: Safeguards PLC I/O modules or motor drives against ambient overtemperature in factory environments. IC Role / Device Role / Timing Role: Standalone thermal watchdog verifying heatsink integrity before enabling high-current outputs. Use Value: UL recognition supports compliance with IEC 61000-6-2/6-4; −55°C to +125°C operating range covers extended industrial temperature grades. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermostat applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM26CIM5-TPA | Identical pinout, package, and electrical specs; same 85°C trip point and open-drain OS output; differs only in top-mark (TTPA vs. TPHA) and RoHS suffix (/NOPB vs. no suffix). | No functional difference; both support identical hysteresis configuration and VTEMP usage. | Select LM26CIM5-TPA if legacy sourcing or non-RoHS compliance is required; otherwise LM26CIM5-PHA/NOPB preferred for lead-free assembly. |
| MAX6505UTP+T | 85°C trip, open-drain output, but uses internal bandgap reference instead of DAC-based trimming; ±4°C accuracy over −55°C to +125°C; 2.7–5.5 V supply. | Lacks VTEMP analog output - eliminates post-assembly verification capability and system-level temperature telemetry. | Choose MAX6505UTP+T only when lowest cost is critical and VTEMP functionality is unnecessary; LM26CIM5-PHA/NOPB offers superior diagnostic capability and tighter trip accuracy. |
Compared with LM26CIM5-TPA, LM26CIM5-PHA/NOPB provides identical thermal switching performance with RoHS-compliant packaging, while MAX6505UTP+T trades VTEMP diagnostics and ±3°C accuracy for lower unit cost and simplified internal architecture.
Availability
LM26CIM5-PHA/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 verified thermal accuracy.
Supply support for LM26CIM5-PHA/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, embedded processing, and connectivity technologies, with leadership in precision analog and thermal management ICs.
The LM26 product line delivers factory-programmed thermostats for system-level thermal protection, designed to replace discrete thermistor-comparator solutions with higher accuracy, smaller footprint, and built-in diagnostics.
FAQ
What is the exact trip temperature of LM26CIM5-PHA/NOPB?
The LM26CIM5-PHA/NOPB has a factory-preset overtemperature shutdown trip point of exactly 85°C. This value is laser-trimmed during manufacturing and remains fixed across all operating conditions; it is not adjustable via external components or programming. The trip accuracy is specified as ±3°C over −55°C to +110°C ambient, ensuring reliable activation before critical thermal limits are breached in the host system.
How does the HYST pin configure hysteresis on LM26CIM5-PHA/NOPB?
On the LM26CIM5-PHA/NOPB, the HYST pin selects between two hysteresis values: connecting HYST to GND sets 10°C hysteresis, while connecting it to V+ sets 2°C hysteresis. This digital input has VIH = 0.8 × V+ and VIL = 0.2 × V+, with leakage current under 10 µA. No external pull-up/down resistors are needed - direct connection to rail or ground suffices. The selected hysteresis determines the temperature delta between OS activation and deactivation.
Can LM26CIM5-PHA/NOPB be used for undertemperature detection?
No, the LM26CIM5-PHA/NOPB is configured exclusively for overtemperature shutdown (OS) with active-low open-drain output. It does not support undertemperature (US) functionality. The part number suffix "PHA" and device comparison table confirm it is preprogrammed as OS output only. For undertemperature applications, alternate variants such as LM26CIM5-HHD (0°C US) or LM26CIM5-BPB (−45°C US) must be selected.
What is the purpose and limitation of the VTEMP pin on LM26CIM5-PHA/NOPB?
The VTEMP pin on LM26CIM5-PHA/NOPB provides an analog voltage proportional to die temperature, following VO = (−3.479 × 10⁻⁶ × (T − 30)²) + (−1.082 × 10⁻² × (T − 30)) + 1.8015 V, with −10.82 mV/°C slope. It enables after-assembly testing and system-level temperature monitoring. However, its drive strength is limited (1 µA source / 40 µA sink), so it must interface with high-impedance inputs or use series resistance to prevent oscillation under capacitive loading.
Is LM26CIM5-PHA/NOPB compatible with standard SOT-23 footprints and reflow profiles?
Yes, LM26CIM5-PHA/NOPB uses the industry-standard 5-pin SOT-23 (DBV) package with 2.90 mm × 1.60 mm body size and 0.95 mm height. It is qualified for standard Pb-free reflow per JEDEC J-STD-020, with peak temperature up to 260°C. The GND pin (pin 2) connects internally to the die backside, making thermal pad design optional but recommended for improved heat dissipation in high-ambient applications.
LM26CIM5-PHA/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:
- 50°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-PHA/NOPB FAQ
1.How can I place an order for LM26CIM5-PHA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26CIM5-PHA/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-PHA/NOPB reliable?
The price and inventory of LM26CIM5-PHA/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-PHA/NOPB is usually 5 days.
3.What payment methods are accepted for LM26CIM5-PHA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26CIM5-PHA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26CIM5-PHA/NOPB?
LM26CIM5-PHA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26CIM5-PHA/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-PHA/NOPB?
For technical support, including LM26CIM5-PHA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26CIM5-PHA/NOPB requirements.
6.How does Aetrix verify that LM26CIM5-PHA/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26CIM5-PHA/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-PHA/NOPB meets industry standards.
7.What is the process for return or replacement of LM26CIM5-PHA/NOPB?
All LM26CIM5-PHA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26CIM5-PHA/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-PHA/NOPB part is unused and in its original packaging.
Return procedure for LM26CIM5-PHA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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