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Texas Instruments LM95241CIMM-2/NOPB
- Part No.:
- LM95241CIMM-2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM95241CIMM-2/NOPB.pdf
- Description:
- SENSOR DIGITAL 0C-85C 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,336
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Product details
Overview
LM95241CIMM-2/NOPB from Texas Instruments is a dual remote diode temperature sensor IC with SMBus 2.0 interface and TruTherm™ technology for precision thermal monitoring of 65nm/90nm Intel processors and discrete transistors (e.g., MMBT3904). It measures local die temperature plus two remote junctions with ±1.25°C accuracy (TA=20–40°C, TD=45–85°C), 0.03125°C resolution with digital filtering, and operates from 3.0 V to 3.6 V. It is used in laptop/desktop thermal management systems requiring high-accuracy, low-power, multi-zone sensing.
For engineers reviewing the LM95241CIMM-2/NOPB datasheet, LM95241CIMM-2/NOPB pinout, LM95241CIMM-2/NOPB application, or LM95241CIMM-2/NOPB equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts - all grounded in TI's SNIS143E datasheet and official product documentation.
Technical Context
The LM95241CIMM-2/NOPB implements a sigma-delta ADC with ΔVBE sensing architecture to measure three thermal zones: its own die (local) and two external diode-connected transistors. Its TruTherm™ circuitry compensates for non-ideality spread in 65nm/90nm Intel processor thermal diodes, enabling accurate readings without external calibration.
It supports programmable digital filtering (11-bit → 13-bit resolution), selectable remote diode models (Intel 65nm/90nm vs. MMBT3904), and SMBus 2.0-compliant communication at up to 100 kHz. The device features dedicated D1+/D1− and D2+/D2− analog front-end channels with integrated analog filtering, diode fault detection, and 1-shot conversion control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Temp Accuracy | ±1.25°C max (TA=20–40°C, TD=45–85°C); enables reliable CPU thermal throttling decisions |
| Local Temp Accuracy | ±3.0°C max (TA=0–85°C); sufficient for ambient or PCB hotspot monitoring |
| Resolution (w/ filtering) | 13-bit unsigned / 12-bit + sign; 0.03125°C LSB resolves sub-degree changes above 127°C |
| Supply Voltage | 3.0 V to 3.6 V; compatible with standard 3.3 V system rails and bypassed via 0.1 µF + 100 pF |
| Avg. Supply Current | 471 µA typical at 1 Hz conversion; supports battery-sensitive portable designs |
| SMBus Compatibility | Fully compliant with SMBus 2.0 spec (10–100 kHz, tTIMEOUT=25–35 ms); interoperable with host BMC/EC |
| Operating Temp Range | 0°C to +85°C ambient (LM95241CIMM grade); qualified for commercial computing environments |
Pinout & Package
LM95241CIMM-2/NOPB uses an 8-pin VSSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch) with exposed thermal pad (not electrically connected). Pin assignments are fixed per TI SNIS143E Rev. MARCH 2013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D1+ | Diode current source (Channel 1) | Drives bias current into remote diode anode; supports Intel 65nm/90nm or MMBT3904 thermal diodes |
| D1− | Diode return current sink (Channel 1) | Completes D1+ current path; fault detection triggers if shorted to GND/VDD or floating |
| D2+ | Diode current source (Channel 2) | Independent second channel for GPU, VRM, or auxiliary IC temperature monitoring |
| D2− | Diode return current sink (Channel 2) | Enables simultaneous dual-remote sensing without multiplexing delay or crosstalk |
| GND | Power supply ground | Low-noise reference for analog front-end; must connect to clean system ground plane |
| VDD | Positive supply input | 3.0–3.6 V rail; requires local 0.1 µF + 100 pF decoupling; noise <200 mVp-p |
| SMBDAT | SMBus bidirectional data line | Open-drain output; requires external pull-up (≤82 kΩ @ 3.0 V); supports I²C compatibility |
| SMBCLK | SMBus clock input | Asynchronous master-driven clock; no clock stretching; timing meets SMBus 2.0 tLOW/tHIGH specs |
Key Features
| Feature | Design Value |
|---|---|
| TruTherm™ technology | Reduces non-ideality spread across 65nm/90nm Intel processors, enabling ±1.25°C accuracy without per-unit calibration |
| Dual independent remote channels | Simultaneous D1+/D1− and D2+/D2− inputs allow concurrent CPU + GPU or CPU + VRM thermal monitoring |
| Programmable digital filtering | Switches resolution from 11-bit (0.125°C LSB) to 13-bit (0.03125°C LSB), improving noise immunity for long PCB traces |
| Remote diode model selection | Register-selectable Intel 65nm/90nm or MMBT3904 mode ensures optimal accuracy for each diode type |
| Diode fault detection | Flags open-circuit, short-to-rail, or floating conditions on D1/D2 and reports −128.000°C (signed) or +255.875°C (unsigned) |
Applications
| Processor Thermal Management | Desktop System Monitoring |
|---|---|
Use Scenario: Real-time die temperature tracking of dual-core Intel CPUs on 65nm/90nm processes in thin-and-light laptops. IC Role / Device Role / Timing Role: Dual remote diode sensor providing SMBus-accessible CPU core and graphics die temperatures at 1–10 Hz update rates. Use Value: Enables dynamic thermal throttling and fan speed control with ±1.25°C accuracy, preventing thermal shutdown while maximizing performance. |
Use Scenario: Multi-zone thermal supervision in ATX desktop motherboards with discrete GPU, VRM, and chipset. IC Role / Device Role / Timing Role: Local sensor monitors ambient PCB temperature; D1+/D1− and D2+/D2− track CPU and GPU junctions independently. Use Value: Eliminates need for separate local + remote sensors; single IC reduces BOM count and layout complexity. |
| Workstation Thermal Control | Embedded Computing Platforms |
Use Scenario: High-reliability thermal monitoring in dual-socket Xeon workstations where CPU junction accuracy directly impacts cooling algorithm stability. IC Role / Device Role / Timing Role: Precision RDTS interfacing with baseboard management controller (BMC) via SMBus for system-level thermal policy enforcement. Use Value: TruTherm™ compensation ensures consistent accuracy across processor lots, reducing qualification overhead. |
Use Scenario: Fanless industrial embedded systems using MMBT3904-based thermal diodes on SoC power stages. IC Role / Device Role / Timing Role: Remote diode sensor configured for discrete transistor model, reading VRM FET junction temperature with 0.03125°C resolution. Use Value: Digital filtering allows >10 cm trace lengths between sensor and diode, easing mechanical integration in compact enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual remote diode temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM95235CIMM/NOPB | Single remote channel; same VSSOP-8 package, 3.0–3.6 V supply, and TruTherm™ support but lacks D2+/D2− inputs | Only suitable when monitoring one remote IC (e.g., CPU only) and local temperature; cannot replace dual-channel requirement | Select LM95241CIMM-2/NOPB when dual remote sensing is mandatory; LM95235CIMM/NOPB only for cost-constrained single-zone designs |
| MAX6642AESA+ | Maxim dual remote sensor; 12-bit resolution (0.0625°C LSB), ±2.0°C remote accuracy, 2.7–5.5 V supply, SO-8 package | Wider voltage range and SO-8 footprint; no TruTherm™-requires external calibration for Intel 65nm/90nm diodes | Choose MAX6642AESA+ only if board space allows SO-8 and system firmware can accommodate lower accuracy or calibration routines |
Compared with LM95235CIMM/NOPB and MAX6642AESA+, the LM95241CIMM-2/NOPB uniquely delivers dual-channel 65nm/90nm-optimized sensing in VSSOP-8 with guaranteed ±1.25°C accuracy and zero-calibration operation-making it irreplaceable for high-fidelity laptop/desktop thermal subsystems.
Availability
LM95241CIMM-2/NOPB is available at Aetrix Electronics and suitable for laptop thermal management, desktop motherboard design, and workstation cooling systems requiring stable component supply, long-term lifecycle assurance, and TI-authorized traceability.
Supply support for LM95241CIMM-2/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 focused on analog and embedded processing technologies, with decades of expertise in precision sensing, power management, and interface solutions.
The LM95241CIMM-2/NOPB belongs to TI's TruTherm™ temperature sensor family, engineered specifically for high-accuracy thermal monitoring of advanced-process microprocessors and discrete power devices in computing platforms.
FAQ
What is the SMBus address of the LM95241CIMM-2/NOPB?
The LM95241CIMM-2/NOPB has a fixed 7-bit SMBus slave address of 0x2A (binary 0101010), as defined by TI's internal A6–A0 mapping for the -2 variant. This address is hardwired and not software-configurable. The LM95241CIMM-2/NOPB responds only to this address on the bus, ensuring predictable communication in multi-sensor systems without address conflicts.
Does the LM95241CIMM-2/NOPB support both Intel 65nm and 90nm thermal diodes?
Yes, the LM95241CIMM-2/NOPB supports both Intel 65nm and 90nm thermal diodes via its TruTherm™ technology and programmable Remote Diode Model Select register. TI's SNIS143E datasheet confirms accuracy is ensured for either process node when TruTherm mode is enabled - no hardware change or external component adjustment is required to switch between them.
How does the LM95241CIMM-2/NOPB handle remote diode faults?
The LM95241CIMM-2/NOPB detects D1+/D1− or D2+/D2− faults including shorts to GND/VDD, open circuits, and floating connections. Upon detection, it reports −128.000°C (signed format) or +255.875°C (unsigned format) and sets the corresponding RD1M or RD2M bit in the Status Register (02h), enabling immediate firmware-level error handling without external supervision.
What is the maximum conversion time for the LM95241CIMM-2/NOPB?
The LM95241CIMM-2/NOPB has a maximum conversion time of 88.9 ms when TruTherm mode is enabled for both remote channels, as specified in the Temperature-to-Digital Converter Characteristics table. This includes sequential measurement of local, remote 1, and remote 2 temperatures - a fixed timing budget unaffected by SMBus activity or register reads.
Can the LM95241CIMM-2/NOPB measure temperatures above 127°C?
Yes, the LM95241CIMM-2/NOPB supports temperatures above 127°C using its 13-bit unsigned remote temperature format (0.03125°C LSB), which resolves up to +255.875°C. This capability is explicitly enabled when digital filtering is active and unsigned resolution is selected - critical for monitoring VRM hotspots or GPU junctions under sustained load.
LM95241CIMM-2/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- TruTherm™
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Sensor Type:
- Digital, Local/Remote
- Sensing Temperature - Local:
- 0°C ~ 85°C
- Sensing Temperature - Remote:
- 0°C ~ 85°C
- Output Type:
- SMBus
- Voltage - Supply:
- 3V ~ 3.6V
- Resolution:
- 10 b (Local), 12 b (Remote)
- Features:
- One-Shot, Programmable Resolution, Shutdown Mode, Standby Mode
- Accuracy - Highest (Lowest):
- ±3°C
- Test Condition:
- 0°C ~ 85°C
- Operating Temperature:
- 0°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-VSSOP
LM95241CIMM-2/NOPB FAQ
1.How can I place an order for LM95241CIMM-2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM95241CIMM-2/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 LM95241CIMM-2/NOPB reliable?
The price and inventory of LM95241CIMM-2/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM95241CIMM-2/NOPB is usually 5 days.
3.What payment methods are accepted for LM95241CIMM-2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM95241CIMM-2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM95241CIMM-2/NOPB?
LM95241CIMM-2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM95241CIMM-2/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 LM95241CIMM-2/NOPB?
For technical support, including LM95241CIMM-2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM95241CIMM-2/NOPB requirements.
6.How does Aetrix verify that LM95241CIMM-2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM95241CIMM-2/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 LM95241CIMM-2/NOPB meets industry standards.
7.What is the process for return or replacement of LM95241CIMM-2/NOPB?
All LM95241CIMM-2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM95241CIMM-2/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 LM95241CIMM-2/NOPB part is unused and in its original packaging.
Return procedure for LM95241CIMM-2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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