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NXP Semiconductors SA56004FD,118
- Part No.:
- SA56004FD,118
- Manufacturer:
- NXP Semiconductors
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SA56004FD,118.pdf
- Description:
- SENSOR DIGITAL -40C-125C 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,846
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Product details
Overview
SA56004FD,118 from NXP Semiconductors is an SMBus-compatible 11-bit remote/local digital temperature sensor with dual overtemperature alarms (ALERT and T_CRIT), ±1 °C remote diode accuracy, and programmable conversion rates from 0.0625 Hz to 26 Hz. It monitors microprocessor thermal diodes or discrete transistors (e.g., 2N3904/2N3906) in server motherboard thermal management systems.
For engineers reviewing the SA56004FD,118 datasheet, SA56004FD,118 pinout, SA56004FD,118 application, or SA56004FD,118 equivalent, this page delivers verified specifications, SO8 package mapping, SMBus 2.0 interface timing behavior, local/remote temperature resolution (0.125 °C), and factory-trimmed diode sensing accuracy - all confirmed against NXP's Rev. 7 product data sheet.
Technical Context
The SA56004FD,118 implements a sigma-delta A/D converter with dual-channel measurement architecture: one on-chip bandgap sensor for local temperature (±2 °C) and one current-source/sink pair (D+, D−) for remote diode junction sensing. Its register map includes dedicated high/low and T_CRIT threshold registers for both channels, plus offset correction for remote channel calibration.
It supports SMBus 2.0 with timeout protocol and I²C Standard/Fast-mode compatibility. The ALERT and T_CRIT outputs are open-drain, active-low, each requiring external pull-up resistors, and independently configurable via mask bits in the Configuration register (CON, address 03h/09h).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Resolution | 11-bit output with 0.125 °C LSB for remote/local readings - enables precise thermal margining in CPU/GPU thermal throttling loops. |
| Remote Accuracy | ±1 °C over −40 °C to +125 °C - achieved via factory trimming of D+/D− current sources for consistent diode biasing. |
| Local Accuracy | ±2 °C over −40 °C to +125 °C - sufficient for ambient or die-adjacent board-level thermal monitoring. |
| Supply Voltage | 3.0 V to 3.6 V - compatible with modern low-voltage server and embedded power rails; undervoltage lockout prevents invalid conversions. |
| Conversion Rate | Programmable from 0.0625 Hz to 26 Hz - allows dynamic trade-off between update latency and system power consumption. |
| Interface Protocol | SMBus 2.0 compliant with TIMEOUT support - ensures robust communication in noisy server backplanes without bus hang risk. |
| Operating Range | −40 °C to +125 °C - validated for industrial and server-grade thermal environments including VRM hotspots. |
Pinout & Package
SA56004FD,118 is supplied in the SO8 package (SOT96-1), 3.9 mm body width, surface-mount plastic small outline format.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply input | Accepts 3.0–3.6 V; powers internal sigma-delta ADC, SMBus interface, and D+/D− current sources. |
| D+ | Diode anode current source | Provides constant bias current to remote PNP substrate diode or NPN transistor base-emitter junction. |
| D− | Diode cathode current sink | Completes remote diode bias path; enables accurate forward-voltage measurement independent of series resistance. |
| T_CRIT | Critical temperature alarm output | Open-drain, active-low signal triggered when local or remote temperature exceeds programmed T_CRIT threshold - used for fan activation or emergency shutdown. |
| GND | Power ground reference | Common return for VDD, analog front-end, and digital logic; must be low-impedance for stable remote sensing. |
| ALERT | General temperature alert output | Open-drain, active-low interrupt indicating local/remote temperature violation of HIGH/LOW thresholds - configurable as comparator or latched interrupt via AM register. |
| SDATA | SMBus/I²C bidirectional data line | Open-drain data pin requiring external ~10 kΩ pull-up; supports standard/fast-mode I²C and full SMBus 2.0 command set. |
| SCLK | SMBus/I²C clock input | Input-only clock line requiring external ~10 kΩ pull-up; synchronizes all register reads/writes and one-shot commands. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed remote diode sensing | Eliminates need for system-level calibration - ±1 °C accuracy maintained across voltage, temperature, and process variation. |
| Independent local/remote threshold programming | Enables asymmetric thermal policies: e.g., aggressive remote T_CRIT for CPU core protection while relaxed local LOW for chassis monitoring. |
| Remote temperature offset correction | Two's-complement 11-bit offset register (RTOHB/RTOLB) compensates for PCB trace resistance and transistor non-ideality in discrete diode implementations. |
| SMBus time-out protocol compliance | Prevents bus lock-up during transient faults - critical for unattended server operation where watchdog resets are undesirable. |
| Eight factory-programmed SMBus addresses | Allows up to eight SA56004FD,118 units on one bus without address conflict - ideal for multi-socket server boards with per-CPU thermal zones. |
Applications
| Server CPU Thermal Monitoring | Laptop GPU Thermal Throttling |
|---|---|
Use Scenario: Real-time monitoring of Intel Xeon or AMD EPYC processor die temperature via integrated substrate PNP diode. IC Role / Device Role / Timing Role: Remote diode sensor providing 0.125 °C-resolution temperature feedback to BMC or host controller for dynamic frequency scaling. Use Value: Enables precise thermal headroom utilization without overdesigning cooling - reduces fan noise and power consumption while maintaining reliability. |
Use Scenario: Tracking NVIDIA or AMD mobile GPU junction temperature using discrete 2N3904 transistor as remote diode. IC Role / Device Role / Timing Role: Local + remote dual-channel sensor feeding thermal policy engine in EC firmware with sub-100 ms update latency. Use Value: Prevents GPU thermal throttling-induced frame drops by triggering early-stage fan ramp-up before critical thresholds are breached. |
| Industrial PLC Cabinet Monitoring | Network Switch ASIC Thermal Protection |
Use Scenario: Ambient and critical component (e.g., power MOSFET) temperature tracking inside sealed control cabinet operating at −25 °C to +70 °C. IC Role / Device Role / Timing Role: Local sensor measures enclosure air temperature; remote channel monitors heatsink-mounted diode on 48 V DC-DC converter. Use Value: Triggers forced-air cooling only when required - extends fan lifetime and avoids condensation risks in humid environments. |
Use Scenario: Monitoring Broadcom or Marvell switch ASIC die temperature in 1RU data center switches with dense thermal layout. IC Role / Device Role / Timing Role: Remote diode sensor connected to ASIC's dedicated thermal test diode; T_CRIT output directly drives hardware shutdown circuitry. Use Value: Guarantees sub-50 ms hardware-initiated shutdown on thermal runaway - prevents ASIC latch-up and field failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar remote/local temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM86IMX/NOPB | Same SO8 footprint and pinout; identical 0.125 °C resolution and −40 °C to +125 °C range; but lacks SMBus TIMEOUT and has only 9-bit remote resolution (0.5 °C LSB). | Valid for legacy designs where SMBus robustness is not required and lower remote accuracy is acceptable. | Select LM86IMX/NOPB only if migrating from existing LM86-based layouts and SMBus timeout immunity is unnecessary. |
| MAX6657AESA+ | SO8 package, same ALERT/T_CRIT dual-alarm structure; supports 3.0–5.5 V supply (wider than SA56004FD,118's 3.0–3.6 V); no remote offset register. | Better suited for mixed-voltage industrial systems; less suitable for precision remote diode calibration in high-density server boards. | Choose MAX6657AESA+ when operating above 3.6 V or when remote offset tuning is not needed. |
Compared with LM86IMX/NOPB and MAX6657AESA+, the SA56004FD,118 provides superior remote diode accuracy (±1 °C vs. ±2 °C), SMBus TIMEOUT resilience, and programmable remote offset - making it the preferred choice for thermally constrained server and embedded applications demanding repeatable, calibrated measurements.
Availability
SA56004FD,118 is available at Aetrix Electronics and suitable for server motherboard thermal management, laptop GPU throttling, industrial PLC cabinet monitoring, and network switch ASIC protection requiring stable component supply across extended temperature ranges.
Supply support for SA56004FD,118 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
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in mixed-signal sensor ICs and system management interfaces.
The SA56004FD,118 belongs to NXP's SA56004X family of SMBus temperature sensors, designed specifically for high-reliability thermal monitoring in multi-processor server platforms and mission-critical embedded systems.
FAQ
What is the remote temperature accuracy specification for SA56004FD,118?
The SA56004FD,118 achieves ±1 °C remote diode temperature accuracy over −40 °C to +125 °C, verified under factory trimming conditions per NXP's Rev. 7 datasheet. This accuracy applies to properly biased PNP substrate diodes or discrete NPN/PNP transistors (e.g., 2N3904) and assumes correct PCB layout per NXP AN10794 guidelines. Local sensor accuracy is ±2 °C.
Does SA56004FD,118 support I²C communication in addition to SMBus?
Yes, SA56004FD,118 is fully compatible with I²C Standard-mode (100 kHz) and Fast-mode (400 kHz) protocols, in addition to SMBus 2.0. Its SDATA and SCLK pins implement open-drain signaling with built-in slew-rate control, and it responds to standard I²C START/STOP/ACK sequences. However, SMBus-specific features like TIMEOUT and ALERT Response Address (ARA) require SMBus controller support.
How is the remote diode connection implemented on SA56004FD,118?
The SA56004FD,118 uses dedicated D+ (pin 2) and D− (pin 3) terminals to bias and measure the forward voltage of an external diode junction. D+ supplies a constant current source to the diode anode; D− sinks matching current from the cathode. This two-terminal configuration rejects series resistance errors and enables accurate remote sensing using either integrated processor diodes or discrete transistors like the 2N3904.
What is the default SMBus slave address for SA56004FD,118?
The SA56004FD,118 has a factory-programmed 7-bit SMBus slave address of 1001101 (0x4D in hexadecimal), as defined in Table 4 of the NXP SA56004X datasheet Rev. 7. This address is stored in OTP memory and cannot be altered. Eight unique addresses are available across the SA56004X family, enabling up to eight devices on a single SMBus segment.
Can SA56004FD,118 operate outside its specified 3.0 V to 3.6 V supply range?
No - SA56004FD,118 is characterized and guaranteed only for operation between 3.0 V and 3.6 V. Operation below 3.0 V triggers undervoltage lockout, halting conversions and holding ALERT/T_CRIT high. Operation above 3.6 V violates absolute maximum ratings and may cause permanent damage. For wider supply ranges, consider alternatives like MAX6657AESA+ (3.0–5.5 V), but note functional trade-offs.
SA56004FD,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Sensor Type:
- Digital, Local/Remote
- Sensing Temperature - Local:
- -40°C ~ 125°C
- Sensing Temperature - Remote:
- -40°C ~ 125°C
- Output Type:
- I2C/SMBus
- Voltage - Supply:
- 3V ~ 5.5V
- Resolution:
- 10 b
- Features:
- Output Switch, Programmable Limit
- Accuracy - Highest (Lowest):
- ±2°C (±3°C)
- Test Condition:
- 60°C ~ 100°C (-40°C ~ 125°C)
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SO
SA56004FD,118 FAQ
1.How can I place an order for SA56004FD,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA56004FD,118 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 SA56004FD,118 reliable?
The price and inventory of SA56004FD,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA56004FD,118 is usually 5 days.
3.What payment methods are accepted for SA56004FD,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA56004FD,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA56004FD,118?
SA56004FD,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA56004FD,118 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 SA56004FD,118?
For technical support, including SA56004FD,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA56004FD,118 requirements.
6.How does Aetrix verify that SA56004FD,118 is sourced from the original manufacturer or authorized distributors?
All SA56004FD,118 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 SA56004FD,118 meets industry standards.
7.What is the process for return or replacement of SA56004FD,118?
All SA56004FD,118 units undergo pre-shipment inspection (PSI). If there is an issue with SA56004FD,118, 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 SA56004FD,118 part is unused and in its original packaging.
Return procedure for SA56004FD,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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