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Texas Instruments TMP423BIDCNR
- Part No.:
- TMP423BIDCNR
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- SOT-23-8
- Datasheet:
-
TMP423BIDCNR.pdf
- Description:
- SENSOR DIGITAL -40C-125C SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,125
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Product details
Overview
TMP423BIDCNR from Texas Instruments is a triple-channel remote + local digital temperature sensor IC in SOT23-8 package, supporting ±1°C remote diode accuracy (max), 12-bit resolution per channel, and SMBus™/two-wire interface. It measures one local die temperature and three independent remote junctions (e.g., CPU, GPU, VRM) in server thermal management systems.
For engineers reviewing the TMP423BIDCNR datasheet, TMP423BIDCNR pinout, TMP423BIDCNR application, or TMP423BIDCNR equivalent, key selection criteria include remote channel count, series resistance cancellation up to 3 kΩ, n-factor correction for transistor ideality, SMBus address configurability (100 1101b), and operation from –40°C to +125°C ambient.
Technical Context
The TMP423BIDCNR implements a dedicated sigma-delta ADC per temperature channel with programmable conversion rate (0.0625–8 conversions/sec), automatic series resistance cancellation across all three remote channels, and configurable n-factor (η = 1.008 optimized) for PNP/NPN diode-connected transistors. Its SMBus interface supports write byte, read byte, send byte, and receive byte commands with 3.4 MHz max clock frequency and 25–35 ms timeout.
It features dual-mode temperature data format: standard binary (–40°C to +127°C) and extended binary (–64°C to +191°C) via RANGE bit in Configuration Register 1, with 0.0625°C resolution in low-byte fractional storage. Diode fault detection and open-circuit monitoring are implemented per remote channel using DXP1/DXP2/DXP3-to-DXN differential sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Accuracy | ±1°C max at +15°C to +85°C ambient, ±3°C max over full –40°C to +125°C ambient range - enables high-confidence thermal throttling without calibration. |
| Local Accuracy | ±1.5°C max over –40°C to +125°C - sufficient for on-die reference against remote hotspots. |
| Resolution | 12-bit (1°C integer + 0.0625°C fractional) - supports precise delta-T monitoring between processor cores and heatsink. |
| Supply Range | 2.7 V to 5.5 V - compatible with 3.3 V and 5 V system rails without level-shifting. |
| Quiescent Current | 32–38 μA at 0.0625 conv/sec; 400–525 μA at 8 conv/sec - scalable power for burst vs. continuous monitoring modes. |
| SMBus Address | 100 1101b (0x4D) - fixed for TMP423B variant, enabling multi-sensor bus addressing without external jumpers. |
| Operating Temp | –40°C to +125°C ambient - qualified for industrial and telecom equipment environments. |
Pinout & Package
SOT23-8 package (DCN designation), 2.9 mm × 1.6 mm × 1.0 mm body, gull-wing leads, JEDEC MO-178AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - DXP1 | Remote Channel 1 positive input | Connects to collector/base of PNP or emitter/base of NPN remote diode; requires no external biasing. |
| 2 - DXP2 | Remote Channel 2 positive input | Independent sensing node for second thermal zone; shares common DXN return path. |
| 3 - DXP3 | Remote Channel 3 positive input | Third independent remote sensing point; enables tri-point board-level thermal profiling. |
| 4 - DXN | Common remote negative input | Shared cathode/anode return for all three remote channels; reduces PCB routing complexity. |
| 5 - GND | Analog/digital ground reference | Must be connected to low-impedance system ground plane to minimize noise coupling into remote sensing paths. |
| 6 - SDA | SMBus data line (open-drain) | Requires external pull-up resistor to V+; supports multi-drop bus with other SMBus slaves. |
| 7 - SCL | SMBus clock line (open-drain) | Driven by host controller; 3.4 MHz max frequency enables fast polling of all four temperature registers. |
| 8 - V+ | Positive supply input | Accepts 2.7–5.5 V; internal UVLO (2.3–2.6 V) prevents erroneous readings during brownout. |
Key Features
| Feature | Design Value |
|---|---|
| Triple remote + local sensing | Simultaneous monitoring of CPU, memory, and VRM temperatures in single IC - eliminates need for multiple discrete sensors and I²C address conflicts. |
| Series resistance cancellation | Compensates up to 3 kΩ trace resistance per remote channel - removes PCB layout-induced temperature offset without calibration. |
| Programmable n-factor | Fixed η = 1.008 optimized for standard PNP/NPN transistors - ensures accurate remote junction modeling without manual tuning. |
| Diode fault detection | Auto-detects open-circuit, short-circuit, and reverse-biased conditions on each DXP/DXN pair - prevents false thermal shutdowns. |
| Extended temperature range | Configurable –64°C to +191°C mode via RANGE bit - supports cold-storage or high-temp industrial applications beyond default –40°C to +127°C. |
Applications
| Processor Thermal Monitoring | Server Rack Thermal Management |
|---|---|
|
Use Scenario: Real-time tracking of CPU core, memory module, and voltage regulator temperatures in 1U rack servers. IC Role / Device Role / Timing Role: Local sensor monitors SoC die temperature; DXP1/DXP2/DXP3 monitor discrete remote diodes embedded in CPU package, DIMM SPD, and VRM MOSFETs. Use Value: Enables dynamic fan speed control and per-component thermal throttling with <±1°C remote accuracy, reducing acoustic noise and extending component life. |
Use Scenario: Distributed thermal supervision across multiple blade servers within a shared chassis environment. IC Role / Device Role / Timing Role: Acts as primary temperature hub per blade, reporting local + three remote values over shared SMBus to central BMC. Use Value: Reduces inter-blade cabling and BMC GPIO count by consolidating four thermal inputs into one SMBus address (0x4D). |
| Telecom Central Office Equipment | Industrial PLC Control Cabinets |
|
Use Scenario: Monitoring power amplifier stages, DSP FPGAs, and cooling fans in carrier-grade baseband units operating at –5°C to +55°C ambient. IC Role / Device Role / Timing Role: Local sensor tracks FPGA junction temp; DXP1–DXP3 track PA transistor case, heatsink baseplate, and ambient intake air via thermistor-diode hybrids. Use Value: Supports fail-safe shutdown when any remote channel exceeds +85°C, meeting GR-63-CORE seismic/thermal reliability requirements. |
Use Scenario: Thermal protection of motor drive inverters, I/O modules, and power supplies inside sealed IP65-rated control cabinets. IC Role / Device Role / Timing Role: Mounted directly on main PCB near heat-generating components; DXP1–DXP3 wired to external diode sensors on power semiconductors. Use Value: Provides 12-bit resolution and series resistance cancellation to maintain accuracy despite long sensor traces (>15 cm) in noisy EMI environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-channel remote temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMP423AIDCNR | SMBus address 100 1100b (0x4C); identical electrical specs and pinout. | No functional difference; used where 0x4C address is required in multi-sensor bus topology. | Select TMP423AIDCNR only when bus address conflict with existing 0x4D devices necessitates alternate addressing. |
| LM95235CIMMX/NOPB | Two remote + one local channels; ±1.5°C remote accuracy; SPI-only interface; no series resistance cancellation. | Limited to dual-zone monitoring; requires SPI host and external compensation for PCB trace resistance. | Choose LM95235CIMMX/NOPB only if SPI interface is mandated and third remote channel is not required. |
Compared with TMP423AIDCNR, TMP423BIDCNR offers identical performance but fixed 0x4D addressing for deterministic bus allocation; versus LM95235CIMMX/NOPB, it delivers superior remote accuracy, triple-channel capability, and built-in series resistance cancellation - critical for high-density server thermal designs.
Availability
TMP423BIDCNR is available at Aetrix Electronics and suitable for server thermal management, telecom baseband units, and industrial PLC cabinet monitoring requiring stable component supply and long-term lifecycle support.
Supply support for TMP423BIDCNR 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 decades of expertise in precision sensing and industrial-grade IC design.
The TMP42x family was designed specifically for high-accuracy, multi-point thermal monitoring in space-constrained computing and communications infrastructure - delivering calibrated remote diode sensing without external compensation components.
FAQ
What is the SMBus address of the TMP423BIDCNR?
The TMP423BIDCNR has a fixed SMBus slave address of 100 1101b (0x4D), determined by its internal A1/A0 logic configuration. This address is distinct from TMP423AIDCNR (0x4C) and allows coexistence on the same SMBus segment when both variants are deployed. The address cannot be changed externally - it is hardwired per device variant.
How many remote temperature channels does the TMP423BIDCNR support?
The TMP423BIDCNR supports exactly three remote temperature sensing channels (via DXP1, DXP2, DXP3) plus one local die temperature channel. Each remote channel uses a dedicated positive input tied to a common DXN return, enabling independent measurement of three discrete thermal zones such as CPU, memory, and VRM in a single SOT23-8 package.
Does the TMP423BIDCNR require external calibration for remote diode accuracy?
No, the TMP423BIDCNR achieves ±1°C remote diode accuracy (max) across multiple IC manufacturers without factory or field calibration. This is enabled by its integrated series resistance cancellation circuitry and fixed n-factor (η = 1.008) optimized for standard PNP/NPN transistors - eliminating the need for user-defined compensation coefficients or lookup tables.
What is the maximum series resistance the TMP423BIDCNR can cancel on remote sensing lines?
The TMP423BIDCNR cancels up to 3 kΩ of series resistance per remote channel (DXP1–DXP3 to DXN), compensating for PCB trace resistance and connector contact resistance. This capability is confirmed in TI's SBOS398C datasheet Figure 4 and Figure 5, and ensures accurate remote junction temperature measurement without layout constraints or external RC filtering.
Can the TMP423BIDCNR operate with a 2.5 V supply voltage?
No, the TMP423BIDCNR requires a minimum supply voltage of 2.7 V per its Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.7 V may trigger undervoltage lockout (UVLO threshold 2.3–2.6 V), resulting in invalid temperature readings or communication failure. For 2.5 V systems, consider the TMP421C (DSBGA-8, 2.55 V min) or alternative families.
TMP423BIDCNR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Sensor Type:
- Digital, Local/Remote
- Sensing Temperature - Local:
- -40°C ~ 125°C
- Sensing Temperature - Remote:
- -64°C ~ 191°C
- Output Type:
- SMBus
- Voltage - Supply:
- 2.7V ~ 5.5V
- Resolution:
- 11 b
- Features:
- One-Shot, Output Switch, Programmable Limit, Shutdown Mode
- Accuracy - Highest (Lowest):
- ±1.5°C (±2.5°C)
- Test Condition:
- 15°C ~ 85°C (-40°C ~ 125°C)
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-23-8
TMP423BIDCNR FAQ
1.How can I place an order for TMP423BIDCNR through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP423BIDCNR 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 TMP423BIDCNR reliable?
The price and inventory of TMP423BIDCNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP423BIDCNR is usually 5 days.
3.What payment methods are accepted for TMP423BIDCNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP423BIDCNR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP423BIDCNR?
TMP423BIDCNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP423BIDCNR 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 TMP423BIDCNR?
For technical support, including TMP423BIDCNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP423BIDCNR requirements.
6.How does Aetrix verify that TMP423BIDCNR is sourced from the original manufacturer or authorized distributors?
All TMP423BIDCNR 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 TMP423BIDCNR meets industry standards.
7.What is the process for return or replacement of TMP423BIDCNR?
All TMP423BIDCNR units undergo pre-shipment inspection (PSI). If there is an issue with TMP423BIDCNR, 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 TMP423BIDCNR part is unused and in its original packaging.
Return procedure for TMP423BIDCNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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