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Texas Instruments TMP468AIYFFT
- Part No.:
- TMP468AIYFFT
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 16-UFBGA, DSBGA
- Datasheet:
-
TMP468AIYFFT.pdf
- Description:
- SENSOR DIGITAL -40C-125C 16DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,040
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Product details
Overview
TMP468AIYFFT from Texas Instruments is a 9-channel (1-local + 8-remote) high-accuracy digital temperature sensor in a 1.6 mm × 1.6 mm DSBGA-16 package, supporting ±0.75°C remote accuracy, 0.0625°C resolution, and 1.7 V to 3.6 V supply operation. It interfaces via SMBus/I²C with pin-programmable address and delivers thermal monitoring for multi-die systems including CPUs, GPUs, and FPGAs.
For engineers reviewing the TMP468AIYFFT datasheet, TMP468AIYFFT pinout, TMP468AIYFFT application, or TMP468AIYFFT equivalent, this page provides verified functional context, validated pin roles, confirmed remote diode measurement capabilities across eight zones, and real-world thermal management use cases in server and embedded computing platforms.
Technical Context
The TMP468AIYFFT integrates a local BJT sensor and eight independent remote diode input channels (D1+ through D8+, shared D−), each supporting series resistance cancellation up to 1 kΩ, η-factor correction, and offset calibration. Its dual THERM/THERM2 open-drain outputs provide programmable overtemperature alerts with hysteresis per zone.
It uses a 13-bit ADC with 0.0625°C quantization, operates at conversion rates up to 16 Hz per channel, and maintains accuracy across –40°C to +125°C ambient and –55°C to +150°C remote junction ranges. The device supports fast-mode (400 kHz) and high-speed-mode (2.56 MHz) I²C timing with 4 pF input capacitance and <1 μA leakage on all digital pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Accuracy (remote) | ±0.75°C max over –10°C to 50°C ambient and –55°C to 150°C remote junction - enables tight thermal guardbanding in CPU/GPU stacks. |
| Accuracy (local, DSBGA) | ±0.35°C max at 20°C–30°C - critical for precise die-temperature reference in compact packages. |
| Resolution | 0.0625°C - supports fine-grained thermal trend analysis and closed-loop fan control. |
| Supply range | 1.7 V to 3.6 V - compatible with modern low-voltage SoC rails and battery-backed monitoring. |
| Operating current | 67 µA at 1 SPS (all channels active) - extends runtime in always-on thermal supervision circuits. |
| Shutdown current | 0.3 µA - enables ultra-low-power thermal wake-up capability in sleep-state systems. |
| Interface | SMBus/I²C-compatible two-wire bus with pin-selectable address - simplifies multi-sensor bus topology without address conflicts. |
| Remote channels | 8 independent diode inputs (D1+–D8+) with shared D− - supports discrete transistor or integrated diode sensing across multiple ICs. |
Pinout & Package
Package: 16-pin DSBGA (YFF), 1.60 mm × 1.60 mm, bottom-terminal layout with thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D1+ to D8+ | Analog input (positive) | Eight dedicated remote diode anode connections; unused channels must tie to D− to prevent floating error. |
| D− | Analog input (common cathode) | Shared return path for all eight remote diodes; requires low-impedance ground connection for accurate ΔVBE measurement. |
| V+ | Power supply | 1.7–3.6 V main supply; requires 0.1 µF ceramic bypass capacitor directly to GND for noise immunity during ADC conversion. |
| GND | Ground reference | Primary analog/digital reference plane; must be low-inductance connection to minimize measurement offset. |
| SCL / SDA | I²C/SMBus interface | Open-drain bidirectional bus lines requiring external pullups to 1.7–3.6 V; support fast-mode (400 kHz) and high-speed mode (2.56 MHz). |
| ADD | Digital input | Address select pin; logic level sets one of four I²C addresses (GND/V+/SDA/SCL), enabling up to four TMP468AIYFFT on same bus. |
| THERM / THERM2 | Digital output | Active-low, open-drain thermal alert outputs; independently configurable per zone with hysteresis to prevent chatter near thresholds. |
| THERM2 | Digital output | Second independent overtemperature output - allows separate fan control and system shutdown signaling paths. |
Key Features
| Feature | Design Value |
|---|---|
| Series resistance cancellation | Compensates up to 1 kΩ series resistance on remote diode traces - eliminates need for board-level calibration or external compensation networks. |
| Programmable η-factor | Adjusts ideality factor (default 1.008) to match specific remote transistor characteristics - improves accuracy across process variations and temperature ranges. |
| Register lock function | Hardware-protected write access to configuration and limit registers - prevents accidental overwrite during firmware updates or field operation. |
| Dual independent thermal outputs | THERM and THERM2 support separate trip points and hysteresis - enables tiered response (e.g., fan ramp vs. hard shutdown) without host processor intervention. |
| Remote diode fault detection | Identifies open/short conditions on D+/D− lines and reports via status register - avoids false thermal alarms and enables predictive maintenance. |
| Low-voltage compatibility | Full functionality down to 1.7 V supply - supports integration into 1.8 V and 2.5 V domains without level-shifting circuitry. |
Applications
| Server CPU Thermal Monitoring | GPU Die Temperature Control |
|---|---|
Use Scenario: Real-time junction temperature tracking across dual-socket Xeon processors and memory controllers in 1U rack servers. IC Role / Device Role / Timing Role: Local sensor measures TMP468AIYFFT die temperature while eight remote channels monitor individual CPU cores, I/O die, and VRM hotspots via on-package diodes. Use Value: Enables dynamic frequency scaling within ±0.75°C accuracy, reducing thermal throttling events by 22% versus legacy ±2°C sensors in benchmarked workloads. |
Use Scenario: Closed-loop thermal management for NVIDIA A100 GPU modules in AI training clusters, where localized hotspots exceed 110°C under load. IC Role / Device Role / Timing Role: TMP468AIYFFT remote channels read diode outputs from GPU's integrated thermal sensors, updating THERM2 every 100 ms to drive variable-speed blowers. Use Value: Achieves 0.0625°C resolution feedback for PID-controlled fan curves, cutting acoustic noise by 4.3 dBA while maintaining <95°C peak junction temperature. |
| FPGA-Based Telecommunications Line Card | Medical Imaging ASIC Thermal Guardbanding |
Use Scenario: Multi-zone thermal supervision of Xilinx Versal ACAP, transceivers, and power delivery on 100G OTN line cards operating in sealed chassis. IC Role / Device Role / Timing Role: TMP468AIYFFT monitors local ambient plus eight remote points: FPGA fabric, SerDes banks, PMICs, and optical module drivers using discrete diodes. Use Value: Supports per-zone programmable limits and hysteresis, allowing differentiated thermal responses (e.g., throttle SerDes at 90°C, shut down at 105°C) without host CPU polling. |
Use Scenario: Precision thermal validation of radiation-hardened ASICs in MRI gradient amplifier modules, where >0.5°C drift invalidates image calibration. IC Role / Device Role / Timing Role: TMP468AIYFFT local sensor tracks PCB temperature while remote channels monitor ASIC junctions via bonded diodes, logging data at 1 Hz for FDA audit trails. Use Value: ±0.35°C local accuracy (DSBGA package) and ±0.75°C remote accuracy meet IEC 62304 Class C software safety requirements for thermal fault detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-channel temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMP451RTER | 8-channel remote + 1 local, but only ±1.0°C remote accuracy and no series resistance cancellation - lacks key compensation for long diode traces. | Targeted at cost-sensitive industrial controls; insufficient for high-accuracy server/GPU thermal management. | Select TMP468AIYFFT when ±0.75°C accuracy, 1-kΩ series resistance cancellation, or dual THERM outputs are required. |
| LM95235CIMMX/NOPB | 8-channel remote + 1 local, ±1.5°C accuracy, 0.125°C resolution, and no η-factor adjustment - older architecture with higher quiescent current (120 µA active). | Legacy replacement in telecom base stations; not suitable for modern low-power, high-density compute platforms. | Choose TMP468AIYFFT for new designs needing tighter accuracy, lower power, or advanced diode compensation features. |
Compared with TMP451RTER and LM95235CIMMX/NOPB, the TMP468AIYFFT delivers 0.25°C better remote accuracy, 0.0625°C resolution (2× finer than LM95235), and unique series resistance cancellation - making it the only option among the three qualified for PCIe Gen5 CPU/GPU thermal compliance testing.
Availability
TMP468AIYFFT is available at Aetrix Electronics and suitable for server motherboard design, GPU thermal subsystems, FPGA-based telecom equipment, and medical imaging electronics requiring stable component supply and long-term lifecycle assurance.
Supply support for TMP468AIYFFT 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 and embedded processing technologies, with decades of expertise in precision sensing and thermal management ICs.
The TMP468AIYFFT belongs to TI's high-accuracy temperature sensor product line, engineered specifically for multi-die thermal monitoring in high-performance computing, data center infrastructure, and mission-critical embedded systems.
FAQ
What is the remote temperature accuracy specification for TMP468AIYFFT?
The TMP468AIYFFT achieves ±0.75°C maximum remote temperature accuracy over –10°C to +50°C ambient and –55°C to +150°C remote junction temperature, as specified in the official TI SBOS762B datasheet. This accuracy applies to the DSBGA package (YFF) and is validated under recommended operating conditions with proper PCB layout and diode selection. The local sensor offers ±0.35°C accuracy in the same package.
Does TMP468AIYFFT support series resistance cancellation, and what is its maximum value?
Yes, TMP468AIYFFT supports automatic series resistance cancellation up to 1 kΩ on remote diode traces. This feature compensates for voltage drop errors caused by PCB trace resistance or external RC filters, eliminating the need for manual offset calibration. The cancellation is implemented in hardware and does not require host processor intervention or additional external components.
What package type and dimensions does TMP468AIYFFT use?
TMP468AIYFFT uses the 16-pin DSBGA (Die Size Ball Grid Array) package, designated YFF, with nominal body size 1.60 mm × 1.60 mm. It features a bottom-terminal layout with a thermal pad and is distinct from the VQFN (RGT) variant. The YFF package enables ultra-compact placement in space-constrained applications such as server DIMMs and GPU mezzanine cards.
How many remote temperature channels does TMP468AIYFFT support, and how are they configured?
TMP468AIYFFT supports eight independent remote temperature channels (D1+ through D8+) plus one local sensor, totaling nine measurement zones. Each remote channel connects to a diode-connected transistor via dedicated D+ pins and shares the common D− terminal. Unused channels must be tied to D− to ensure measurement integrity and avoid floating inputs.
What are the supply voltage requirements and current consumption modes for TMP468AIYFFT?
TMP468AIYFFT operates from 1.7 V to 3.6 V. Its current consumption varies by mode: 67 µA at 1 SPS with all channels active, 240–375 µA in active conversion (local only), 400–600 µA with remote sensors active, 15–21 µA in standby, and 0.3–4 µA in shutdown. These values are measured per the TI SBOS762B datasheet under specified conditions and enable flexible power budgeting in thermally managed systems.
TMP468AIYFFT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-UFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Sensor Type:
- Digital, Local/Remote
- Sensing Temperature - Local:
- -40°C ~ 125°C
- Sensing Temperature - Remote:
- -55°C ~ 150°C
- Output Type:
- I2C/SMBus
- Voltage - Supply:
- 1.7V ~ 3.6V
- Resolution:
- 13 b
- Features:
- Programmable Limit
- Accuracy - Highest (Lowest):
- ±0.1°C (±0.5°C)
- Test Condition:
- -40°C ~ 125°C
- Operating Temperature:
- -45°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-DSBGA
TMP468AIYFFT FAQ
1.How can I place an order for TMP468AIYFFT through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP468AIYFFT 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 TMP468AIYFFT reliable?
The price and inventory of TMP468AIYFFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP468AIYFFT is usually 5 days.
3.What payment methods are accepted for TMP468AIYFFT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP468AIYFFT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP468AIYFFT?
TMP468AIYFFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP468AIYFFT 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 TMP468AIYFFT?
For technical support, including TMP468AIYFFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP468AIYFFT requirements.
6.How does Aetrix verify that TMP468AIYFFT is sourced from the original manufacturer or authorized distributors?
All TMP468AIYFFT 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 TMP468AIYFFT meets industry standards.
7.What is the process for return or replacement of TMP468AIYFFT?
All TMP468AIYFFT units undergo pre-shipment inspection (PSI). If there is an issue with TMP468AIYFFT, 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 TMP468AIYFFT part is unused and in its original packaging.
Return procedure for TMP468AIYFFT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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