NXP Semiconductors SA56004GDP,118

Overview

SA56004GDP,118 from NXP Semiconductors is an SMBus/I²C-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 (0.0625–26 Hz) for thermal monitoring in server CPU subsystems.

For engineers reviewing the SA56004GDP,118 datasheet, SA56004GDP,118 pinout, SA56004GDP,118 application, or SA56004GDP,118 equivalent, this device delivers precise local/remote sensing across −40 °C to +125 °C, factory-trimmed diode interface compatibility with 2N3904/2N3906 transistors, and SMBus timeout protocol support for robust system thermal management.

Technical Context

The SA56004GDP,118 integrates a Σ-Δ A/D converter with separate local thermal sensor and remote diode sensing channels, each with independent high/low/T_CRIT threshold registers and offset correction capability. Its architecture supports simultaneous local and remote temperature measurement with 0.125 °C resolution (11-bit two's complement format).

It implements SMBus 2.0-compliant communication with open-drain SDATA/SCLK, ALERT, and T_CRIT outputs requiring external 10 kΩ pull-ups. The device features programmable fault queue behavior (single vs. triple-out-of-limit detection), undervoltage lockout, and JEDEC JESD78 latch-up immunity exceeding 100 mA.

Key Specifications

Pinout & Package

TSSOP8 package (SOT505-1): plastic thin shrink small outline, 8 leads, 3 mm body width, lead pitch 0.65 mm, RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar remote/local digital temperature sensor applications.

Compared with LM86IMMX/NOPB and MAX6657AESA+, the SA56004GDP,118 provides superior remote accuracy (±1 °C), dedicated remote offset correction, and programmable T_CRIT hysteresis - enabling tighter thermal guardbanding and reduced false-trigger events in high-reliability server and industrial systems.

Availability

SA56004GDP,118 is available at Aetrix Electronics and suitable for server motherboard design, industrial PLC thermal management, and network equipment ASIC monitoring requiring stable component supply across extended temperature ranges.

Supply support for SA56004GDP,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 company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The SA56004GDP,118 belongs to NXP's precision analog sensor portfolio, designed specifically for high-accuracy thermal monitoring in compute-intensive systems where reliability, SMBus robustness, and diode interface flexibility are critical.

FAQ

What is the remote diode interface configuration supported by the SA56004GDP,118?

The SA56004GDP,118 supports remote temperature sensing via a constant-current-excited diode junction, compatible with microprocessor substrate PNP diodes or discrete transistors such as the 2N3904 (NPN) and 2N3906 (PNP). Pin D+ supplies ≈10 µA current to the diode anode, while D− sinks current from the cathode, enabling accurate junction voltage measurement for temperature calculation. This interface is factory trimmed to achieve ±1 °C remote accuracy.

Does the SA56004GDP,118 support both SMBus and I²C protocols?

Yes, the SA56004GDP,118 is fully compatible with SMBus 2.0 and I²C Standard-mode (100 kHz) and Fast-mode (400 kHz). It implements SMBus timeout protocol for enhanced bus reliability and uses open-drain SDATA and SCLK pins requiring external 10 kΩ pull-up resistors. The device responds to standard SMBus read/write commands and supports Alert Response Address (ARA) functionality for multi-device interrupt arbitration.

How does the T_CRIT output differ from the ALERT output on the SA56004GDP,118?

The T_CRIT output on the SA56004GDP,118 is a dedicated critical-temperature alarm that activates when either local or remote temperature exceeds its independently programmable threshold (LCS/RCS registers), typically used for emergency fan activation or system shutdown. In contrast, the ALERT output signals general out-of-range conditions (high/low thresholds for both channels) and supports configurable latching behavior via the fault queue bit. Both are open-drain, active-low outputs requiring external pull-ups.

Can the SA56004GDP,118 operate outside the 3.0 V to 3.6 V supply range?

No - the SA56004GDP,118 is specified only for operation between 3.0 V and 3.6 V. An internal undervoltage lockout circuit disables temperature conversion and holds outputs in a safe state if VDD falls below the threshold, preventing erroneous readings. Operation at 5 V or below 3.0 V is not supported and may cause functional failure or damage. The device is not rated for 5 V-tolerant I/O.

What package type and footprint does the SA56004GDP,118 use?

The SA56004GDP,118 uses the TSSOP8 package (SOT505-1): an 8-lead, plastic thin shrink small outline package with 3 mm body width and 0.65 mm lead pitch. It is RoHS compliant and designed for surface-mount reflow assembly. This package is pin-compatible with SO8 and HVSON8 variants of the SA56004X family, enabling layout reuse across thermal performance tiers.