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NXP Semiconductors SA56004AD,112
- Part No.:
- SA56004AD,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SA56004AD,112.pdf
- Description:
- SENSOR DIGITAL -40C-125C 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,281
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Product details
Overview
SA56004AD,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 0.125 °C resolution - used for thermal monitoring of microprocessor junctions and discrete diodes in server motherboard management.
For engineers reviewing the SA56004AD,112 datasheet, SA56004AD,112 pinout, SA56004AD,112 application, or SA56004AD,112 equivalent, this page delivers verified specifications, SO8 package details, SMBus 2.0 timing behavior, local/remote temperature register mapping, and validated drop-in alternatives to LM86 and MAX6657.
Technical Context
The SA56004AD,112 integrates a Σ-Δ A/D converter with dedicated local thermal sensor and remote diode interface (D+/D−) supporting PNP/NPN junctions. Its dual alarm architecture uses independent programmable thresholds for local and remote channels, with separate ALERT (open-drain, active-Low) and T_CRIT (open-drain, active-Low) outputs.
It implements SMBus 2.0 protocol compliance including TIMEOUT detection and ARA response capability, operates from 3.0 V to 3.6 V, and supports conversion rates from 0.0625 Hz to 26 Hz via the CR register. Factory-trimmed offset registers enable fine-tuning of remote diode measurement accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 11-bit (0.125 °C LSB) for local/remote temperature data; enables precise thermal margining in high-performance computing systems |
| Remote Accuracy | ±1 °C at −40 °C to +125 °C range - factory-trimmed for direct use with microprocessor thermal diodes without calibration |
| Local Accuracy | ±2 °C - sufficient for ambient or die-package temperature tracking near the sensor IC itself |
| Supply Voltage | 3.0 V to 3.6 V - compatible with modern low-voltage server and workstation power rails |
| Interface | SMBus 2.0 and I²C Standard/Fast-mode - supports shared bus topology with up to 8 devices using unique 7-bit slave addresses |
| Conversion Rate | Programmable from 0.0625 Hz to 26 Hz - allows trade-off between update latency and system power consumption |
| Operating Temp | −40 °C to +125 °C - qualified for industrial and server-grade thermal environments |
Pinout & Package
SA56004AD,112 is supplied in the SO8 package (SOT96-1), 3.9 mm body width, 8-lead plastic small outline format.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply input | 3.0–3.6 V DC rail; requires local decoupling capacitor for stable A/D conversion |
| D+ | Diode current source (anode) | Drives constant current into external PNP substrate diode or 2N3904/2N3906 base-emitter junction |
| D− | Diode sink current (cathode) | Completes remote diode bias path; connects to emitter of PNP or collector of NPN transistor |
| T_CRIT | Critical temperature alarm output | Open-drain, active-Low signal - triggers fan activation or system shutdown when local/remote exceeds T_CRIT threshold |
| GND | Power ground reference | Common return for VDD, D+, D−, and internal analog/digital blocks |
| ALERT | General over/undertemperature alarm | Open-drain, active-Low interrupt - indicates violation of HIGH/LOW thresholds for local or remote channel |
| SDATA | SMBus/I²C bidirectional data line | Open-drain interface requiring external 10 kΩ pull-up; supports multi-master arbitration and ARA protocol |
| SCLK | SMBus/I²C clock input | Asynchronous clock input; requires external 10 kΩ pull-up; defines timing for register reads/writes and one-shot commands |
Key Features
| Feature | Design Value |
|---|---|
| Remote diode sensing | ±1 °C accuracy across −40 °C to +125 °C - eliminates need for system-level calibration when monitoring CPU/GPU thermal diodes |
| Programmable offset registers | 11-bit two's complement remote offset (RTOHB/RTOLB) - corrects for PCB trace resistance and transistor non-ideality |
| Dual independent alarm outputs | ALERT (configurable as comparator/interrupt) and T_CRIT (critical shutdown) - enables hierarchical thermal response in servers |
| SMBus TIMEOUT protection | Prevents bus lockup during communication faults - ensures robustness in mission-critical thermal management subsystems |
| Undervoltage lockout | Blocks erroneous temperature readings during power ramp-up - prevents false alarms during system boot |
Applications
| Server CPU Thermal Monitoring | Laptop GPU Junction Sensing |
|---|---|
Use Scenario: Real-time thermal supervision of Intel Xeon or AMD EPYC processor substrate diodes on dual-socket server motherboards. IC Role / Device Role / Timing Role: Remote temperature sensor interfacing directly to CPU thermal diode via D+/D− pins; provides 0.125 °C resolution readings every 62.5 ms (16 Hz default). Use Value: Enables dynamic fan speed control and throttling decisions within 100 ms of thermal excursion - critical for maintaining ASHRAE Class A2 environmental compliance. |
Use Scenario: Compact thermal feedback for NVIDIA GeForce RTX GPU die temperature in thin-and-light gaming laptops. IC Role / Device Role / Timing Role: Local sensor monitors SoC ambient; remote channel tracks GPU junction via onboard 2N3906 PNP diode; SMBus polling synchronized to GPU power state transitions. Use Value: Supports rapid thermal response (<50 ms) to GPU boost clocks - avoids thermal throttling while preserving battery life through adaptive conversion rate scaling. |
| Industrial PLC Cabinet Management | Network Switch ASIC Thermal Guarding |
Use Scenario: Ambient and component-level temperature monitoring inside IP65-rated programmable logic controller enclosures operating in factory-floor environments. IC Role / Device Role / Timing Role: Local sensor tracks cabinet air temperature; remote channel monitors heat-generating I/O module transistors; ALERT output wired to PLC interrupt input. Use Value: Provides deterministic overtemperature response (T_CRIT assertion within 38 ms of threshold breach) - meets IEC 61131-2 functional safety timing requirements. |
Use Scenario: Thermal supervision of Broadcom Tomahawk or Marvell Prestera switch ASICs in 1RU data center switches. IC Role / Device Role / Timing Role: Remote diode interface tracks ASIC junction; local sensor monitors VRM temperature; dual alarms feed into BMC for predictive fan control and graceful link-down. Use Value: Enables sub-1°C thermal margining for 25G/50G SerDes lanes - reduces bit error rate drift caused by temperature-induced voltage reference drift. |
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 footprint and pinout; identical 11-bit resolution and ±1 °C remote accuracy; lacks SMBus TIMEOUT protocol support | No built-in bus fault recovery - requires external watchdog or host firmware handling for stuck-bus conditions | Select LM86IMX/NOPB only if SMBus TIMEOUT is not required and legacy design reuse is prioritized |
| MAX6657AESA+ | SO8 package; same D+/D− remote sensing; 0.25 °C resolution (vs. 0.125 °C); no T_CRIT output - ALERT serves both general and critical alarms | Single-alarm architecture requires software arbitration to distinguish critical vs. warning events - increases BMC firmware complexity | Choose MAX6657AESA+ where cost sensitivity outweighs need for hardware-separated critical shutdown signaling |
Compared with SA56004AD,112, LM86IMX/NOPB offers identical thermal performance but reduced bus robustness, while MAX6657AESA+ trades resolution and dual-alarm hardware separation for lower unit cost - making SA56004AD,112 optimal for high-reliability server and industrial thermal guard applications.
Availability
SA56004AD,112 is available at Aetrix Electronics and suitable for server motherboard thermal management, laptop GPU junction sensing, industrial PLC cabinet monitoring, and network switch ASIC guarding requiring stable component supply across extended product lifecycles.
Supply support for SA56004AD,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, with deep expertise in mixed-signal sensor integration and embedded system management.
The SA56004AD,112 belongs to NXP's precision thermal sensor family designed specifically for high-density computing platforms requiring simultaneous local and remote diode temperature measurement with hardware-enforced alarm hierarchy.
FAQ
What is the remote diode sensing accuracy of SA56004AD,112 over its full operating temperature range?
The SA56004AD,112 achieves ±1 °C remote diode temperature accuracy across the full −40 °C to +125 °C operating range, as specified in the official NXP datasheet Rev. 7. This accuracy is factory-trimmed and does not require end-user calibration when used with standard PNP substrate diodes or discrete transistors like the 2N3904/2N3906. The SA56004AD,112 maintains this specification under nominal 3.3 V supply and SMBus communication loads.
Does SA56004AD,112 support SMBus Alert Response Address (ARA) protocol?
Yes, SA56004AD,112 fully supports SMBus 2.0 Alert Response Address (ARA) protocol. Its ALERT pin functions as an ARA-capable interrupt line, allowing multiple SA56004AD,112 devices (or other ARA-compliant slaves) to share a common interrupt bus. When ALERT is asserted, the SMBus master can issue an ARA command to identify which SA56004AD,112 triggered the alert - confirmed in Section 7.9.1.3 of the NXP datasheet.
What is the default SMBus slave address for SA56004AD,112?
The SA56004AD,112 has a factory-programmed 7-bit SMBus slave address of 1001000 (0x48 in hexadecimal), as defined in Table 4 of the NXP datasheet. This address is stored in OTP memory and cannot be changed. Eight unique SA56004X variants exist (AD through HD), each with a distinct address enabling up to eight sensors on a single SMBus segment without conflict.
Can SA56004AD,112 measure both local and remote temperatures simultaneously?
SA56004AD,112 performs sequential local and remote temperature conversions in free-running mode, not true simultaneity. Each full cycle measures local temperature first, then remote diode temperature, with a typical total conversion time of ~38 ms at default 16 Hz rate. However, both results are stored in dedicated registers (LTHB/LTLB and RTHB/RTLB) and available for immediate readout - effectively providing coordinated dual-channel thermal data for real-time system response.
Is SA56004AD,112 pin-compatible with LM86 and MAX6657/8?
Yes, SA56004AD,112 is pin-compatible with the National Semiconductor LM86 and Maxim MAX6657/8 in SO8 package configuration. Pin mapping (VDD, D+, D−, T_CRIT, GND, ALERT, SDATA, SCLK) matches exactly, and electrical characteristics (open-drain outputs, SMBus timing, voltage levels) are interoperable. This allows direct replacement in existing designs without PCB modification - explicitly stated in the NXP general description and ordering information sections.
SA56004AD,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
SA56004AD,112 FAQ
1.How can I place an order for SA56004AD,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA56004AD,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 SA56004AD,112 reliable?
The price and inventory of SA56004AD,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA56004AD,112 is usually 5 days.
3.What payment methods are accepted for SA56004AD,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA56004AD,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA56004AD,112?
SA56004AD,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA56004AD,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 SA56004AD,112?
For technical support, including SA56004AD,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA56004AD,112 requirements.
6.How does Aetrix verify that SA56004AD,112 is sourced from the original manufacturer or authorized distributors?
All SA56004AD,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 SA56004AD,112 meets industry standards.
7.What is the process for return or replacement of SA56004AD,112?
All SA56004AD,112 units undergo pre-shipment inspection (PSI). If there is an issue with SA56004AD,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 SA56004AD,112 part is unused and in its original packaging.
Return procedure for SA56004AD,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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