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NXP Semiconductors SA56004FD,112
- Part No.:
- SA56004FD,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SA56004FD,112.pdf
- Description:
- SENSOR DIGITAL -40C-125C 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,895
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Product details
Overview
SA56004FD,112 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 rate 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,112 datasheet, SA56004FD,112 pinout, SA56004FD,112 application, or SA56004FD,112 equivalent, key selection considerations include its SO8 package, factory-programmed SMBus address (1001 101), 3.0–3.6 V supply range, open-drain ALERT/T_CRIT outputs, and remote offset calibration capability.
Technical Context
The SA56004FD,112 integrates a Σ-Δ A/D converter with separate local and remote sensing paths, supporting simultaneous 11-bit (0.125 °C LSB) temperature measurements. Its register-mapped SMBus 2.0 interface includes timeout protection, configurable RUN/STOP control, and status-driven interrupt latching via ALERT and T_CRIT pins.
It implements dual alarm architecture: ALERT signals out-of-range conditions (local/remote HIGH/LOW thresholds), while T_CRIT activates only on critical overtemperature events (programmable at 85 °C default). Remote diode measurement uses D+/D− current source/sink terminals with factory-trimmed offset compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 11-bit (0.125 °C LSB) for local and remote temperature data |
| Remote Accuracy | ±1 °C over −40 °C to +125 °C, achieved via factory trimming |
| Supply Voltage | 3.0 V to 3.6 V - ensures compatibility with modern low-voltage server logic rails |
| Conversion Rate | Programmable from 0.0625 Hz to 26 Hz - enables dynamic power/accuracy trade-offs |
| SMBus Address | Factory-programmed 7-bit address 1001 101 - supports up to eight devices on one bus |
| Operating Temp | −40 °C to +125 °C - qualified for industrial and server-grade thermal environments |
| Interface | SMBus 2.0 and I²C Standard/Fast-mode compatible - interoperable with common system controllers |
Pinout & Package
SA56004FD,112 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 circuitry and bias for D+/D− diode excitation |
| D+ | Diode anode current source | Provides constant current to forward-bias external PNP substrate or NPN transistor diode junction |
| D− | Diode cathode current sink | Completes remote diode bias path; enables accurate ΔVBE measurement |
| T_CRIT | Critical overtemperature output | Open-drain, active-low signal used to trigger fan activation or emergency shutdown |
| GND | Power ground reference | Common return for analog and digital sections; critical for noise-sensitive temperature measurement |
| ALERT | General over/undertemperature alarm | Open-drain, active-low interrupt indicating violation of any programmed HIGH/LOW threshold |
| SDATA | SMBus/I²C bidirectional data line | Open-drain interface requiring external pull-up; carries command/data packets per SMBus 2.0 |
| SCLK | SMBus/I²C clock input | Master-generated clock synchronizing all register reads/writes and conversion triggers |
Key Features
| Feature | Design Value |
|---|---|
| Remote diode offset calibration | Adjustable via RTOHB/RTOLB registers - corrects for transistor-specific VBE non-idealities |
| Programmable T_CRIT hysteresis | Configurable 1–31 °C hysteresis (TH register) - prevents chatter during critical thermal transitions |
| Undervoltage lockout (UVLO) | Prevents erroneous readings below valid VDD threshold - ensures reliable startup behavior |
| One-shot conversion mode | Initiated by writing 0Fh to command register - enables precise timing control in low-power standby |
| Latch-up immunity | Tested to JEDEC JESD78 (>100 mA) - guarantees robustness in noisy server power environments |
Applications
| Server CPU Thermal Monitoring | Laptop GPU Temperature Control |
|---|---|
Use Scenario: Real-time tracking of multi-core processor die temperature using integrated PNP substrate diode. IC Role / Device Role / Timing Role: Remote temperature sensor providing 0.125 °C resolution readings every 62.5 ms (16 Hz default) to BMC firmware. Use Value: Enables dynamic frequency scaling and fan speed modulation before thermal throttling occurs. |
Use Scenario: Compact thermal supervision of discrete GPU die via 2N3904-connected diode on space-constrained motherboard. IC Role / Device Role / Timing Role: Local + remote dual-channel sensor delivering synchronized readings to embedded EC controller. Use Value: Prevents GPU thermal shutdown by triggering active cooling at 70 °C (programmable RHSHB) with 10 °C hysteresis. |
| Industrial PLC Cabinet Management | Network Switch ASIC Thermal Protection |
Use Scenario: Ambient and component-level temperature monitoring inside sealed industrial control cabinets operating at −40 °C to +85 °C. IC Role / Device Role / Timing Role: Local sensor (±2 °C accuracy) and remote channel for power MOSFET junction monitoring. Use Value: Triggers cabinet ventilation when local temperature exceeds 75 °C (LHS) and disables output stages if remote diode hits 105 °C (RCS). |
Use Scenario: High-density 1U switch with multiple ASICs requiring independent thermal zones and shared SMBus alert line. IC Role / Device Role / Timing Role: One SA56004FD,112 per ASIC, each with unique SMBus address (1001 101) sharing single ALERT net. Use Value: Reduces BOM count vs. discrete sensors while enabling per-ASIC T_CRIT shutdown without bus contention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar remote/local digital temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM86IMX/NOPB | Same SO8 package and pinout; identical 11-bit resolution and SMBus interface; lacks remote offset register | No remote diode calibration - less accurate with non-ideal transistors like 2N3906 | Choose LM86IMX/NOPB only if remote diode matching is consistent across production units |
| MAX6657ESA+ | SO8 package; same ALERT/T_CRIT outputs; 12-bit resolution (0.0625 °C) but no T_CRIT hysteresis register | Higher resolution but fixed 10 °C T_CRIT hysteresis - less flexible for fast-transient ASICs | Select MAX6657ESA+ when sub-0.1 °C resolution is prioritized over programmable hysteresis |
Compared with LM86IMX/NOPB and MAX6657ESA+, SA56004FD,112 uniquely combines factory-trimmed ±1 °C remote accuracy, programmable T_CRIT hysteresis, and remote offset calibration - making it optimal for high-reliability server and industrial thermal designs where diode variation must be compensated.
Availability
SA56004FD,112 is available at Aetrix Electronics and suitable for server motherboard thermal management, industrial PLC cabinet monitoring, and network switch ASIC protection requiring stable component supply across extended temperature ranges.
Supply support for SA56004FD,112 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.
The SA56004X family was designed specifically for high-accuracy, multi-point thermal monitoring in enterprise computing platforms - emphasizing SMBus reliability, remote diode fidelity, and robust interrupt handling for mission-critical systems.
FAQ
What is the factory-programmed SMBus address for SA56004FD,112?
The SA56004FD,112 has a fixed 7-bit SMBus slave address of 1001 101 (0x4D in hexadecimal), as defined in Table 4 of the datasheet. This address is stored in OTP memory and cannot be modified. It allows up to eight SA56004X devices - including SA56004FD,112 - to coexist on the same SMBus without conflict when using distinct address variants.
Does SA56004FD,112 support both SMBus and I²C protocols?
Yes, SA56004FD,112 is fully compatible with SMBus 2.0 and I²C Standard-mode (100 kHz) and Fast-mode (400 kHz). Its open-drain SDATA and SCLK pins meet electrical specifications for both buses, and its timeout protocol satisfies SMBus requirements. No configuration is needed to switch between protocols - behavior is determined by the master controller's signaling.
How is remote diode accuracy maintained across temperature and process variation in SA56004FD,112?
SA56004FD,112 achieves ±1 °C remote accuracy through factory trimming of internal current sources and offset compensation circuitry. Each unit undergoes calibration against traceable thermal standards, and the resulting correction values are stored in OTP. Additionally, the SA56004FD,112 provides user-accessible remote offset registers (RTOHB/RTOLB) to fine-tune for specific diode characteristics post-deployment.
Can SA56004FD,112 operate outside the 3.0–3.6 V supply range specified in the datasheet?
No - SA56004FD,112 is rated strictly for 3.0 V to 3.6 V operation. The datasheet specifies undervoltage lockout (UVLO) that disables measurement functionality below ~2.85 V to prevent invalid readings. Operation above 3.6 V risks permanent damage, as absolute maximum ratings cap VDD at 3.8 V. For wider supply ranges, consider alternative sensors with integrated LDOs or voltage supervisors.
What is the function of the T_CRIT hysteresis register (TH) in SA56004FD,112?
The TH register (address 21h) configures hysteresis for the T_CRIT output, ranging from 1 °C to 31 °C in 1 °C steps. This prevents rapid toggling of the T_CRIT signal during thermal transients near the critical threshold. For example, if RCS is set to 105 °C and TH = 0Ah (10 °C), T_CRIT deasserts only when temperature falls to 95 °C - ensuring stable fan control or shutdown sequencing in SA56004FD,112-based systems.
SA56004FD,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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,112 FAQ
1.How can I place an order for SA56004FD,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA56004FD,112 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,112 reliable?
The price and inventory of SA56004FD,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA56004FD,112 is usually 5 days.
3.What payment methods are accepted for SA56004FD,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA56004FD,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA56004FD,112?
SA56004FD,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA56004FD,112 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,112?
For technical support, including SA56004FD,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA56004FD,112 requirements.
6.How does Aetrix verify that SA56004FD,112 is sourced from the original manufacturer or authorized distributors?
All SA56004FD,112 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,112 meets industry standards.
7.What is the process for return or replacement of SA56004FD,112?
All SA56004FD,112 units undergo pre-shipment inspection (PSI). If there is an issue with SA56004FD,112, 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,112 part is unused and in its original packaging.
Return procedure for SA56004FD,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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