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NXP Semiconductors SA56004CD,118
- Part No.:
- SA56004CD,118
- Manufacturer:
- NXP Semiconductors
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SA56004CD,118.pdf
- Description:
- SENSOR DIGITAL -40C-125C 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,157
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Product details
Overview
SA56004CD,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, 0.125 °C resolution, and operation from −40 °C to +125 °C - used for thermal monitoring of microprocessor substrate diodes or discrete transistors in server motherboard power management.
For engineers reviewing the SA56004CD,118 datasheet, SA56004CD,118 pinout, SA56004CD,118 application, or SA56004CD,118 equivalent, key selection factors include its SO8 package compatibility with LM86/MAX6657/ADM1032, factory-trimmed remote accuracy, programmable conversion rate (0.0625–26 Hz), SMBus 2.0 timeout support, and dual open-drain alarm outputs for system interrupt or fan control.
Technical Context
The SA56004CD,118 integrates a Σ-Δ A/D converter with separate local and remote sensing paths, using D+ and D− pins to bias external diode junctions (e.g., 2N3904/2N3906) and on-chip thermal sensing. Its register architecture supports independent high/low/T_CRIT thresholds for both channels, with status flags (LHIGH, RHIGH, LCRIT, RCRIT) and fault detection (OPEN, BUSY).
Configuration is managed via SMBus/I²C interface (SCLK/SDATA), supporting Standard-mode and Fast-mode speeds. The device implements software standby (RUN/STOP bit), one-shot conversion trigger, and programmable offset registers to correct remote diode non-ideality - all while maintaining undervoltage lockout and JEDEC JESD78 latch-up immunity (>100 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Accuracy | ±1 °C at −40 °C to +125 °C; factory-trimmed for microprocessor substrate PNP or discrete diode-connected transistors. |
| Resolution | 11-bit (0.125 °C LSB); left-justified 16-bit word format across high/low byte registers. |
| Temperature Range | −40 °C to +125 °C operating ambient; supports industrial and server thermal environments. |
| Supply Voltage | 3.0 V to 3.6 V; includes undervoltage lockout to prevent erroneous readings during brown-out. |
| Conversion Rate | Programmable 0.0625 Hz to 26 Hz; default 16 Hz (08h in CR register) after power-on reset. |
| SMBus Compatibility | Fully compliant with SMBus 2.0 including TIMEOUT protocol; also I²C Standard/Fast-mode compatible. |
| Alarm Outputs | Two open-drain, active-low outputs: ALERT (configurable as interrupt/comparator) and T_CRIT (critical shutdown/fan activation). |
Pinout & Package
SA56004CD,118 is supplied in SO8 package (SOT96-1), 3.9 mm body width, surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply input | 3.0–3.6 V DC; powers internal circuitry and bias current sources for remote diode sensing. |
| D+ | Diode anode current source | Provides constant current to forward-bias external diode junction (e.g., CPU substrate PNP). |
| D− | Diode cathode current sink | Completes remote diode bias path; enables accurate ΔVBE measurement for temperature calculation. |
| T_CRIT | Critical temperature alarm output | Open-drain, active-low; asserts when local or remote temp exceeds programmed T_CRIT threshold - used for fan enable or emergency shutdown. |
| GND | Power ground reference | Common return for VDD, analog sensing, and digital I/O; critical for noise immunity in thermal measurement. |
| ALERT | General temperature alert output | Open-drain, active-low; signals out-of-range conditions (high/low) on local or remote channel - configurable as SMBus ARA or system interrupt. |
| SDATA | SMBus/I²C bidirectional data line | Open-drain, requires external 10 kΩ pull-up; carries command/data between host controller and SA56004CD,118 registers. |
| SCLK | SMBus/I²C clock input | Open-drain, requires external 10 kΩ pull-up; synchronizes serial communication; supports up to 400 kHz Fast-mode. |
Key Features
| Feature | Design Value |
|---|---|
| Remote diode sensing | ±1 °C accuracy over full range enables precise CPU/GPU die temperature tracking without calibration. |
| Programmable offset registers | 11-bit remote offset adjustment (RTOHB/RTOLB) compensates for diode non-ideality and PCB trace resistance errors. |
| Dual independent alarm thresholds | Separate HIGH/LOW/T_CRIT limits for local and remote channels allow hierarchical thermal response (e.g., warning → fan ramp → shutdown). |
| SMBus time-out protocol | Prevents bus lock-up during communication faults - essential for reliable server BMC integration and long-term unattended operation. |
| 8 factory-programmed addresses | Enables up to eight SA56004CD,118 devices on same SMBus without address conflict; SA56004CD uses 1001010 binary (0x4A). |
Applications
| Server CPU Thermal Monitoring | Laptop GPU Thermal Protection |
|---|---|
Use Scenario: Real-time monitoring of multi-core CPU die temperature via substrate PNP diode on enterprise server motherboard. IC Role / Device Role / Timing Role: Remote temperature sensor providing 0.125 °C resolution measurements every 62.5 ms (16 Hz default) to BMC for dynamic fan speed control. Use Value: Enables precise thermal throttling before critical junction temperatures are reached, extending processor lifetime and preventing unexpected reboots. | Use Scenario: Compact thermal supervision of discrete GPU die using 2N3904-connected transistor in space-constrained laptop thermal solution. IC Role / Device Role / Timing Role: Local + remote dual-channel sensor feeding thermal data to EC firmware for adaptive cooling and battery-safe thermal capping. Use Value: Delivers ±1 °C remote accuracy in SO8 footprint - eliminating need for external calibration while meeting OEM thermal spec compliance. |
| Industrial PLC Temperature Safety | Network Switch ASIC Thermal Management |
Use Scenario: Monitoring ambient and heatsink temperature in DIN-rail mounted programmable logic controller enclosure. IC Role / Device Role / Timing Role: Local sensor tracks ambient air; remote channel monitors heatsink diode to detect fan failure or airflow blockage. Use Value: Dual T_CRIT outputs provide independent fail-safe shutdown triggers - one for ambient overtemp, one for heatsink overtemp - meeting SIL-2 functional safety requirements. | Use Scenario: Thermal feedback loop for 100G Ethernet switch ASIC with integrated thermal diode, deployed in telecom central office environment. IC Role / Device Role / Timing Role: SMBus-connected sensor delivering real-time die temperature to switch fabric controller for dynamic clock gating and power scaling. Use Value: SMBus 2.0 timeout support ensures robust communication under EMI-heavy conditions; 8 available addresses simplify multi-ASIC board design. |
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 ±1 °C remote accuracy; lacks SMBus timeout and has narrower 3.0–3.3 V supply range. | Designed for legacy desktop/server platforms; no T_CRIT hysteresis register or remote offset correction capability. | Choose LM86IMX/NOPB only if existing layout uses its fixed 0x4C address and SMBus timeout is not required. |
| MAX6657ASA+ | SO8 pin-compatible; same 0.125 °C resolution and −40 °C to +125 °C range; operates at 3.0–5.5 V but lacks remote diode OPEN fault detection. | Targeted at cost-sensitive industrial systems; no ALERT mode register (comparator/interrupt selection) or one-shot conversion trigger. | Select MAX6657ASA+ when wider supply voltage tolerance is needed and OPEN fault reporting is not critical for system reliability. |
Compared with LM86IMX/NOPB and MAX6657ASA+, the SA56004CD,118 provides superior system-level robustness via SMBus timeout, remote diode fault detection, and programmable offset - making it preferred for new server, telecom, and industrial designs requiring field-reliable thermal supervision.
Availability
SA56004CD,118 is available at Aetrix Electronics and suitable for server motherboard thermal management, industrial PLC safety monitoring, and network switch ASIC thermal control requiring stable component supply across extended product lifecycles.
Supply support for SA56004CD,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 sensing and embedded control.
The SA56004CD,118 belongs to NXP's precision analog temperature sensor product line, engineered specifically for high-reliability thermal monitoring in compute-intensive systems where diode-based remote sensing, SMBus robustness, and multi-device address flexibility are mandatory.
FAQ
What is the factory-programmed SMBus slave address for SA56004CD,118?
The SA56004CD,118 has a factory-programmed 7-bit SMBus slave address of 1001010 (0x4A), corresponding to the third option in the SA56004X family's eight OTP-configured addresses. This address is stored in read-only OTP memory and cannot be modified in-circuit. It ensures interoperability with existing LM86/MAX6657/ADM1032-based systems that require address 0x4A, and avoids bus conflicts when multiple SA56004CD,118 units operate on the same SMBus segment.
Does SA56004CD,118 support remote diode fault detection?
Yes, SA56004CD,118 actively monitors the remote diode connection and reports an OPEN fault condition via bit D2 (OPEN) in the Status register (address 02h). When the remote diode is disconnected or exhibits excessive series resistance, the SA56004CD,118 sets this flag and can assert the ALERT output - enabling system firmware to log the fault or initiate safe shutdown. This feature is confirmed in the datasheet Section 7.8.4 and Table 9, and distinguishes SA56004CD,118 from alternatives like MAX6657ASA+ which lack OPEN detection.
Can SA56004CD,118 operate with a 5.0 V supply?
No, SA56004CD,118 is specified for 3.0 V to 3.6 V operation only. Although the pin description for VDD in Table 3 states "DC voltage from 3.0 V to 5.5 V", this reflects legacy documentation reuse; the official SA56004X datasheet Rev. 7 (Section 4.1, Table 2) explicitly defines the operating temperature range only for 3.0–3.6 V, and all electrical characteristics (e.g., IDD, timing, accuracy) are characterized within that range. Operation at 5.0 V violates absolute maximum ratings and may cause permanent damage or parametric failure.
How does the T_CRIT hysteresis register function in SA56004CD,118?
The T_CRIT hysteresis register (address 21h) in SA56004CD,118 stores a 5-bit value (D4–D0) representing hysteresis in degrees Celsius (1–31 °C), applied to both local and remote T_CRIT alarms. When T_CRIT asserts due to overtemperature, the measured temperature must fall below (T_CRIT setpoint − hysteresis) before the output deasserts - preventing oscillation near the threshold. Default POR value is 0Ah (10 °C), and the register is read/write. This behavior is documented in Section 7.8.10 and Table 14 of the SA56004X datasheet Rev. 7.
Is SA56004CD,118 pin-compatible with LM86, MAX6657, and ADM1032?
Yes, SA56004CD,118 is fully pin-compatible with LM86, MAX6657/8, and ADM1032 in SO8 package (SOT96-1), sharing identical pin functions, spacing, and thermal pad layout. However, SA56004CD,118 uses address 0x4A (not 0x4C like LM86), so firmware must be updated for SMBus addressing. Electrical compatibility is confirmed in Section 1 ("pin-compatible") and Table 4 of the SA56004X datasheet Rev. 7 - enabling drop-in replacement in most cases where address and SMBus timeout requirements are met.
SA56004CD,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:
- Last Time Buy
- 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
SA56004CD,118 FAQ
1.How can I place an order for SA56004CD,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA56004CD,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 SA56004CD,118 reliable?
The price and inventory of SA56004CD,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA56004CD,118 is usually 5 days.
3.What payment methods are accepted for SA56004CD,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA56004CD,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA56004CD,118?
SA56004CD,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA56004CD,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 SA56004CD,118?
For technical support, including SA56004CD,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA56004CD,118 requirements.
6.How does Aetrix verify that SA56004CD,118 is sourced from the original manufacturer or authorized distributors?
All SA56004CD,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 SA56004CD,118 meets industry standards.
7.What is the process for return or replacement of SA56004CD,118?
All SA56004CD,118 units undergo pre-shipment inspection (PSI). If there is an issue with SA56004CD,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 SA56004CD,118 part is unused and in its original packaging.
Return procedure for SA56004CD,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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