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NXP Semiconductors SA56004BD,118
- Part No.:
- SA56004BD,118
- Manufacturer:
- NXP Semiconductors
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SA56004BD,118.pdf
- Description:
- SENSOR DIGITAL -40C-125C 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,163
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Product details
Overview
SA56004BD,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 thermal management systems.
For engineers reviewing the SA56004BD,118 datasheet, SA56004BD,118 pinout, SA56004BD,118 application, or SA56004BD,118 equivalent, key selection criteria include its SO8 package, 3.0–3.6 V supply, 11-bit 0.125 °C resolution, SMBus 2.0 TIMEOUT support, and factory-programmed I²C address 1001001b - critical for multi-sensor server board integration.
Technical Context
The SA56004BD,118 integrates a Σ-Δ A/D converter with separate local and remote sensing paths, using D+ and D− pins to bias external diodes for remote junction measurement. Its register-mapped architecture supports independent configuration of local/remote high/low thresholds and T_CRIT limits via SMBus commands.
It implements dual interrupt outputs: ALERT (open-drain, active-low, maskable per status bit) and T_CRIT (open-drain, active-low, independently configurable for local or remote channel exceedance). The device supports software standby mode (<10 µA quiescent current) and one-shot conversion initiation while retaining register state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 11-bit (0.125 °C LSB) for remote/local temp data; enables precise thermal margining in CPU/GPU thermal throttling. |
| Remote Accuracy | ±1 °C at −40 °C to +125 °C after factory trimming; eliminates need for system-level calibration against processor diode junctions. |
| Supply Voltage | 3.0 V to 3.6 V; compatible with standard 3.3 V server logic rails without level-shifting. |
| Interface | SMBus 2.0 and I²C Standard/Fast-mode; supports TIMEOUT protocol to prevent bus lockup during sensor fault conditions. |
| Conversion Rate | Programmable 0.0625 Hz to 26 Hz; allows dynamic adjustment between low-power monitoring (e.g., idle servers) and rapid response (e.g., thermal emergency). |
| Operating Temp | −40 °C to +125 °C ambient; validated for use inside server chassis near CPUs, VRMs, and memory modules. |
| Slave Address | Factory-programmed 7-bit address 1001001b (0x49); enables co-location with up to seven other SA56004X variants on same SMBus segment. |
Pinout & Package
SA56004BD,118 is supplied in the SO8 (SOT96-1) plastic small outline package, 3.9 mm body width, lead pitch 1.27 mm, RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply input | Accepts 3.0–3.6 V; powers internal regulator, A/D, and SMBus interface; requires local 100 nF decoupling. |
| D+ | Diode anode current source | Provides constant-current bias (≈10 µA) to external PNP substrate diode or NPN transistor base-emitter junction. |
| D− | Diode cathode sink | Completes remote diode bias path; connects to emitter (PNP) or collector (NPN); must be routed with matched trace length to D+. |
| T_CRIT | Critical temperature alarm output | Open-drain, active-low; drives cooling fan enable or system shutdown controller; requires external 4.7 kΩ pull-up to VDD. |
| GND | Power ground reference | Analog/digital common return; must be connected to low-impedance system ground plane adjacent to VDD decoupling. |
| ALERT | General temperature alert output | Open-drain, active-low; signals out-of-range local or remote temperature; shares interrupt line with other SMBus devices. |
| SDATA | SMBus/I²C bidirectional data | Open-drain data line; requires 10 kΩ pull-up; supports multi-master arbitration and ARA protocol for interrupt source identification. |
| SCLK | SMBus/I²C clock input | Asynchronous clock input; driven by host controller; timing compliant with SMBus 2.0 Fast-mode (400 kHz max). |
Key Features
| Feature | Design Value |
|---|---|
| Remote diode offset correction | Configurable via RTOHB/RTOLB registers; compensates for transistor package parasitics and PCB trace resistance to maintain ±1 °C accuracy. |
| Undervoltage lockout | Prevents erroneous temperature readings during power ramp-up or brownout; ensures valid data only when VDD ≥ 2.7 V. |
| Programmable T_CRIT hysteresis | Adjustable 1–31 °C via TH register; prevents thermal oscillation during fan activation/deactivation cycles in closed-loop cooling systems. |
| Latch-up immunity | Tested to JEDEC JESD78 (>100 mA); ensures robustness against transient ESD events on D+/D− lines in high-density server boards. |
| Alert mode flexibility | Selectable comparator or interrupt mode via AM register bit D0; supports both polling-based and interrupt-driven firmware architectures. |
Applications
| Server CPU Thermal Monitoring | Laptop GPU Thermal Throttling |
|---|---|
Use Scenario: Real-time tracking of Intel Xeon or AMD EPYC processor die temperature via integrated substrate PNP diode. 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 frequency scaling. Use Value: Enables precise thermal headroom management without requiring dedicated analog front-end circuitry or ADC resources on host SoC. | Use Scenario: Monitoring 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 control loop in embedded controller (EC) firmware. Use Value: Delivers ±1 °C remote accuracy at 3.3 V supply, eliminating need for external voltage references or calibration tables in thin-client designs. |
| Industrial PLC Cabinet Cooling | Network Switch ASIC Thermal Protection |
Use Scenario: Detecting overheating in DIN-rail mounted programmable logic controllers operating in uncooled enclosures at 70 °C ambient. IC Role / Device Role / Timing Role: System-level thermal watchdog triggering forced-air cooling via T_CRIT output when cabinet internal temperature exceeds 85 °C. Use Value: Provides fail-safe shutdown path independent of host processor, meeting IEC 61508 functional safety requirements for industrial control. | Use Scenario: Protecting Broadcom or Marvell switch ASICs by monitoring thermal diode on BGA package using SA56004BD,118's D+/D− interface. IC Role / Device Role / Timing Role: Remote temperature sensor integrated into 1U switch management subsystem, reporting via SMBus to baseboard management controller. Use Value: Supports hot-swap capable thermal monitoring with SMBus TIMEOUT recovery, preventing bus hang during ASIC thermal fault conditions. |
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 |
|---|---|---|---|
| LM86IMMX/NOPB | Same SO8 package and pinout; identical 11-bit resolution and ±1 °C remote accuracy; but operates at 3.0–3.6 V only (no 5 V tolerance); lacks T_CRIT hysteresis register. | Valid drop-in replacement where T_CRIT hysteresis is not required; requires verification of SMBus address conflict (LM86 uses 1001100b vs. SA56004BD,118's 1001001b). | Select LM86IMMX/NOPB only if existing design already uses LM86 firmware and address mapping; verify compatibility with existing SMBus topology. |
| MAX6657ESA+ | SO8 package; same 11-bit resolution and ±1 °C remote accuracy; supports 3.0–5.5 V supply; includes built-in EEPROM for offset storage; no ALERT mask bit in config register. | Preferred for mixed-voltage systems (3.3 V and 5 V domains); EEPROM enables permanent offset calibration; lacks SMBus TIMEOUT protocol support. | Choose MAX6657ESA+ when board-level voltage rails exceed 3.6 V or when non-volatile offset storage is required across power cycles. |
Compared with LM86IMMX/NOPB and MAX6657ESA+, SA56004BD,118 offers unique SMBus TIMEOUT resilience and programmable T_CRIT hysteresis-critical for high-availability server platforms where bus reliability and thermal control stability are prioritized over supply voltage flexibility.
Availability
SA56004BD,118 is available at Aetrix Electronics and suitable for server thermal management, laptop GPU protection, industrial PLC cooling, and network switch ASIC monitoring requiring stable component supply across extended production lifecycles.
Supply support for SA56004BD,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 sensor signal conditioning and embedded system management.
The SA56004X family was designed specifically for high-reliability thermal monitoring in multi-core server and workstation platforms, emphasizing SMBus robustness, diode interface precision, and dual-alarm interrupt architecture.
FAQ
What is the factory-programmed SMBus slave address for SA56004BD,118?
The SA56004BD,118 has a factory-programmed 7-bit SMBus slave address of 1001001b (0x49), as defined in Table 4 of the NXP datasheet. This address is stored in OTP memory and cannot be modified. It enables direct interoperability with host controllers expecting this address and avoids conflicts when multiple SA56004X sensors share the same bus - provided other variants use distinct addresses like 1001010b (SA56004CD) or 1001100b (SA56004ED).
Does SA56004BD,118 support both local and remote temperature sensing simultaneously?
Yes, SA56004BD,118 performs concurrent local (on-chip) and remote (external diode) temperature measurements in free-running mode. Its Σ-Δ A/D converter alternates between channels, storing results in separate LTHB/LTLB and RTHB/RTLB registers. The default conversion rate is 16 Hz, yielding ~62.5 ms cycle time per channel, and both values are available for real-time comparison against independently programmable HIGH/LOW/T_CRIT thresholds.
How does the T_CRIT output differ from the ALERT output on SA56004BD,118?
The T_CRIT output on SA56004BD,118 is a dedicated critical-temperature alarm that activates only when local or remote temperature exceeds its specific threshold register (LCS/RCS), while ALERT responds to any out-of-range condition - including local/remote HIGH/LOW violations. T_CRIT is typically used for irreversible actions (e.g., system shutdown), whereas ALERT serves general thermal interrupts. Both are open-drain and require external pull-ups, but their enable masks (bits 2/4 vs. bit 7 in CON register) are controlled independently.
Can SA56004BD,118 measure temperature using a 2N3906 PNP transistor as the remote diode?
Yes, SA56004BD,118 explicitly supports PNP transistors like the 2N3906 as remote diodes. Its D+ pin sources current into the emitter, and D− sinks current from the collector, effectively biasing the base-emitter junction. The datasheet confirms compatibility with "substrate PNP of a microprocessor or a diode connected transistor such as the 2N3904 (NPN) or 2N3906 (PNP)", and factory trimming ensures ±1 °C accuracy across the full −40 °C to +125 °C range when used with these devices.
What is the purpose of the remote temperature offset registers in SA56004BD,118?
SA56004BD,118 includes RTOHB and RTOLB registers to apply fine-grained correction (±63.875 °C in 0.125 °C steps) to remote diode measurements, compensating for parasitic resistances in PCB traces, transistor package effects, or non-ideal diode behavior. This offset is added algebraically to the raw remote reading before comparison with threshold registers, enabling system-level calibration without modifying host firmware - critical for achieving ±1 °C accuracy across diverse board layouts and component batches.
SA56004BD,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
SA56004BD,118 FAQ
1.How can I place an order for SA56004BD,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA56004BD,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 SA56004BD,118 reliable?
The price and inventory of SA56004BD,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA56004BD,118 is usually 5 days.
3.What payment methods are accepted for SA56004BD,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA56004BD,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA56004BD,118?
SA56004BD,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA56004BD,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 SA56004BD,118?
For technical support, including SA56004BD,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA56004BD,118 requirements.
6.How does Aetrix verify that SA56004BD,118 is sourced from the original manufacturer or authorized distributors?
All SA56004BD,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 SA56004BD,118 meets industry standards.
7.What is the process for return or replacement of SA56004BD,118?
All SA56004BD,118 units undergo pre-shipment inspection (PSI). If there is an issue with SA56004BD,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 SA56004BD,118 part is unused and in its original packaging.
Return procedure for SA56004BD,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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