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NXP Semiconductors SA56004BD,112
- Part No.:
- SA56004BD,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SA56004BD,112.pdf
- Description:
- SENSOR DIGITAL -40C-125C 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,226
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Product details
Overview
SA56004BD,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 rates from 0.0625 Hz to 26 Hz. It monitors microprocessor thermal diodes or discrete transistors (e.g., 2N3904/2N3906) in server thermal management systems.
For engineers reviewing the SA56004BD,112 datasheet, SA56004BD,112 pinout, SA56004BD,112 application, or SA56004BD,112 equivalent, key selection criteria include remote diode interface compatibility, SMBus 2.0 timeout support, open-drain ALERT/T_CRIT interrupt behavior, and factory-trimmed ±1 °C remote accuracy across −40 °C to +125 °C.
Technical Context
The SA56004BD,112 integrates a Σ-Δ A/D converter with separate local and remote sensing paths, supporting simultaneous 11-bit (0.125 °C LSB) remote diode and on-chip temperature measurements. Its register-mapped SMBus interface enables independent configuration of local/remote high/low thresholds and T_CRIT limits, with status flags for BUSY, LCRIT, RCRIT, OPEN, and alarm conditions.
It implements SMBus time-out protocol compliance and supports both interrupt and comparator modes for the ALERT output via the ALERT Mode (AM) register. The device operates in free-running or software standby mode (IDD < 10 μA), with conversion rate controlled by a 4-bit CR register and remote offset correction via dedicated RTOHB/RTOLB registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Accuracy | ±1 °C at −25 °C to +100 °C; enables precise CPU die thermal monitoring without calibration. |
| Local Accuracy | ±2 °C over full range; sufficient for ambient or package-level system temperature tracking. |
| Resolution | 11-bit (0.125 °C LSB) for remote/local temp data; allows fine-grained thermal trend analysis. |
| Supply Voltage | 3.0 V to 3.6 V; compatible with standard 3.3 V logic rails and avoids level-shifting overhead. |
| Operating Range | −40 °C to +125 °C; supports industrial and server-grade thermal environments. |
| Interface | SMBus 2.0 and I²C Standard/Fast-mode; ensures interoperability with host controllers using common two-wire protocols. |
| Conversion Rate | Programmable 0.0625 Hz to 26 Hz; balances power consumption vs. thermal response latency. |
Pinout & Package
SA56004BD,112 is supplied in 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; powers internal circuitry and diode bias current source. |
| D+ | Diode anode current source | Provides 10 μA constant current to forward-bias external PNP or NPN diode junctions. |
| D− | Diode cathode sink | Completes remote diode measurement path; requires connection to diode cathode. |
| T_CRIT | Critical temperature alarm output | Open-drain, active-low; triggers fan activation or emergency shutdown when local/remote exceeds T_CRIT threshold. |
| GND | Power ground reference | Common return for VDD, analog sensing, and digital I/O; must be low-impedance for accuracy. |
| ALERT | General over/undertemperature alarm | Open-drain, active-low; signals out-of-range local or remote temperature per programmed HIGH/LOW thresholds. |
| SDATA | SMBus/I²C bidirectional data line | Open-drain, requires external 10 kΩ pull-up; carries command, address, and register data. |
| SCLK | SMBus/I²C clock input | Open-drain, requires external 10 kΩ pull-up; synchronizes serial communication with host controller. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed remote accuracy | ±1 °C over −25 °C to +100 °C eliminates need for system-level calibration during production. |
| Programmable remote offset | RTOHB/RTOLB registers allow fine-tuning of remote diode readings to compensate for transistor-specific non-idealities. |
| Dual independent alarm outputs | Separate ALERT (configurable HIGH/LOW) and T_CRIT (critical-only) pins enable tiered thermal response strategies. |
| SMBus timeout compliance | Prevents bus lockup during communication faults; enhances reliability in multi-slave server backplanes. |
| Undervoltage lockout | Blocks erroneous temperature reads during power ramp-up or brownout, ensuring valid data only under stable VDD. |
Applications
| Server CPU Thermal Monitoring | Laptop System Fan Control |
|---|---|
Use Scenario: Real-time tracking of microprocessor die temperature using integrated substrate PNP diode. IC Role / Device Role / Timing Role: Remote diode sensor with 0.125 °C resolution and ±1 °C accuracy, interfacing via D+/D− pins. Use Value: Enables dynamic fan speed adjustment before thermal throttling occurs, preserving performance and acoustics. | Use Scenario: Coordinating cooling response across CPU, GPU, and chipset in space-constrained mobile platforms. IC Role / Device Role / Timing Role: Dual-sensing node providing local ambient and remote component temperature to EC firmware. Use Value: Reduces thermal runaway risk by triggering T_CRIT-driven forced shutdown if critical thresholds are exceeded. |
| Industrial PLC Temperature Supervision | Network Switch ASIC Thermal Protection |
Use Scenario: Monitoring heat-sensitive analog signal conditioning circuits in programmable logic controllers. IC Role / Device Role / Timing Role: Local temperature sensor with ±2 °C accuracy and SMBus alerting for environmental derating. Use Value: Supports predictive maintenance by logging long-term ambient drift and correlating with analog performance degradation. | Use Scenario: Protecting high-power Ethernet switch ASICs operating at up to 125 °C junction temperature. IC Role / Device Role / Timing Role: Remote diode monitor connected to ASIC's built-in thermal diode, reporting via SMBus to BMC. Use Value: Ensures compliance with IEEE 802.3az EEE thermal limits by activating link-down or power reduction on T_CRIT assertion. |
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 package and pinout; identical ALERT/T_CRIT functionality but lacks SMBus timeout protocol support. | Valid for legacy SMBus hosts without timeout enforcement; not recommended for new server designs requiring robust bus fault recovery. | Select LM86IMX/NOPB only if SMBus timeout is unused and cost sensitivity outweighs long-term bus reliability requirements. |
| MAX6657ESA+ | SO8 package with matching pin assignment; supports same 0.125 °C resolution but specifies ±2 °C remote accuracy (vs. ±1 °C for SA56004BD,112). | Suitable for less demanding thermal control where ±2 °C tolerance is acceptable; no factory-trimmed remote calibration. | Choose MAX6657ESA+ when absolute remote accuracy is secondary to broad vendor availability and legacy design continuity. |
Compared with LM86IMX/NOPB and MAX6657ESA+, SA56004BD,112 delivers superior remote diode accuracy (±1 °C), mandatory SMBus timeout compliance, and programmable remote offset-making it the preferred choice for high-reliability server and industrial thermal management where precision and bus robustness are critical.
Availability
SA56004BD,112 is available at Aetrix Electronics and suitable for server thermal management, laptop fan control, and industrial PLC supervision requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SA56004BD,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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in mixed-signal sensor ICs and system management interfaces.
The SA56004BD,112 belongs to NXP's SA56004X family of SMBus temperature sensors, designed specifically for high-accuracy, dual-point thermal monitoring in mission-critical computing infrastructure where reliability and protocol compliance are non-negotiable.
FAQ
What is the remote temperature accuracy specification for SA56004BD,112?
The SA56004BD,112 achieves ±1 °C remote diode temperature accuracy over −25 °C to +100 °C, verified by factory trimming. This applies to standard PNP substrate diodes or discrete NPN/PNP transistors like 2N3904/2N3906 connected to the D+ and D− pins. Local on-chip sensing accuracy is ±2 °C across the full −40 °C to +125 °C operating range. These values are specified in the official NXP SA56004X datasheet Rev. 7.
Does SA56004BD,112 support SMBus timeout protocol?
Yes, SA56004BD,112 fully complies with SMBus 2.0 timeout protocol requirements. This feature prevents bus lockup during communication errors by automatically releasing the bus after a defined timeout period. It is implemented in hardware and requires no software configuration. The timeout behavior is documented in Section 7.1 of the SA56004X datasheet and distinguishes SA56004BD,112 from alternatives like LM86IMX/NOPB that lack this capability.
What package type is used for SA56004BD,112?
SA56004BD,112 is packaged in SO8 (SOT96-1), an 8-lead plastic small outline package with 3.9 mm body width. This matches the pinout and footprint of industry-standard equivalents including LM86, MAX6657/8, and ADM1032. The SO8 variant is optimized for through-hole and surface-mount assembly in server motherboards and industrial control boards.
How does the ALERT output function in interrupt mode for SA56004BD,112?
In interrupt mode (default), SA56004BD,112 asserts ALERT low when any temperature alarm condition occurs (LHIGH, LLOW, RHIGH, RLOW, LCRIT, or RCRIT). Reading the Status register (address 02h) automatically clears the alarm flags and deasserts ALERT, while also setting the ALERT mask bit (bit 7 of CON register) to prevent re-triggering until the host resets it. This ensures clean interrupt service routine handling without spurious repeats.
Can SA56004BD,112 measure both local and remote temperatures simultaneously?
Yes, SA56004BD,112 performs concurrent local (on-die) and remote (diode-connected transistor) temperature measurements in free-running mode. Each conversion cycle updates both the Local Temperature Data Register (LTHB/LTLB) and Remote Temperature Data Register (RTHB/RTLB) with 11-bit, 0.125 °C resolution values. The device uses a shared Σ-Δ ADC with multiplexed inputs, and conversion timing is governed by the programmable Conversion Rate register (CR).
SA56004BD,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
SA56004BD,112 FAQ
1.How can I place an order for SA56004BD,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA56004BD,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 SA56004BD,112 reliable?
The price and inventory of SA56004BD,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA56004BD,112 is usually 5 days.
3.What payment methods are accepted for SA56004BD,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA56004BD,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA56004BD,112?
SA56004BD,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA56004BD,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 SA56004BD,112?
For technical support, including SA56004BD,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA56004BD,112 requirements.
6.How does Aetrix verify that SA56004BD,112 is sourced from the original manufacturer or authorized distributors?
All SA56004BD,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 SA56004BD,112 meets industry standards.
7.What is the process for return or replacement of SA56004BD,112?
All SA56004BD,112 units undergo pre-shipment inspection (PSI). If there is an issue with SA56004BD,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 SA56004BD,112 part is unused and in its original packaging.
Return procedure for SA56004BD,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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