Renesas SAP51D-B-G1-R

Overview

SAP51D-B-G1-R from Integrated Device Technology is a universal AS-Interface (AS-i) transceiver IC compliant with AS-Interface Complete Specification V3.0, designed for physical-layer interface in master or slave nodes. It delivers 55mA electronic inductor current drive, supports 5.33/16MHz crystal frequencies via automatic detection, and operates across -25°C to +85°C. Used in industrial sensor/actuator interconnection over two-wire unshielded cable carrying both power and data.

For engineers reviewing the SAP51D-B-G1-R datasheet, SAP51D-B-G1-R pinout, SAP51D-B-G1-R application, or SAP51D-B-G1-R equivalent, key selection considerations include AS-i V3.0 compliance, SOP16 package compatibility, dual-mode programmability (Standard Slave or Master), integrated burst protection, and EEPROM-based configuration storage for field deployment.

Technical Context

The SAP51D-B-G1-R implements a full AS-i physical layer with integrated receiver, transmitter, and electronic inductor - eliminating external coil requirements. Its on-chip oscillator supports automatic 5.33/16MHz crystal detection, and its main state machine handles AS-i telegram encoding/decoding, timing control, and safety-critical watchdog functions including clock and communication monitors.

Configuration is stored in internal EEPROM and supports three operational modes: Standard Slave Mode (default), Master Mode, and Safety Mode (SAP5S only - not applicable to SAP51). The device features dedicated parameter (P[3:0]/PSTBn) and data (D[3:0]/DSTBn) ports with synchronous I/O capability and input filtering for noise immunity in harsh industrial environments.

Key Specifications

Pinout & Package

SAP51D-B-G1-R is housed in a 16-pin SOP (300 mil) surface-mount package with 1.27 mm pitch, optimized for automated assembly and industrial board-level reliability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar AS-i physical layer interface applications.

Compared with ASI4U and SAP5SD-B-G1-R, the SAP51D-B-G1-R offers optimal balance of configurability, external MCU integration, and cost efficiency for non-safety AS-i slave and master implementations - especially where field reprogramming and legacy system compatibility are priorities.

Availability

SAP51D-B-G1-R is available at Aetrix Electronics and suitable for AS-i slave modules, AS-i master controllers, and industrial sensor nodes requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant packaging.

Supply support for SAP51D-B-G1-R 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

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, interface, and RF solutions for communications and industrial markets.

The SAP51/SAP5S product line was developed specifically for AS-Interface physical layer implementation in harsh industrial environments - delivering robust two-wire bus connectivity with integrated power and data transport.

FAQ

What is the primary function of the SAP51D-B-G1-R in an AS-i network?

The SAP51D-B-G1-R serves as a universal AS-Interface physical-layer transceiver, enabling bidirectional data and power transmission over a two-wire unshielded cable. It functions as either a master or standard slave node, handling AS-i V3.0-compliant signal modulation, bus power regulation (via UOUT), and digital I/O interfacing. Its role is strictly physical-layer - it does not execute safety protocols or run application firmware.

Does the SAP51D-B-G1-R support AS-i Safety Mode?

No, the SAP51D-B-G1-R does not support AS-i Safety Mode. That functionality is exclusive to the SAP5S variant (e.g., SAP5SD-B-G1-R), which includes a dedicated cryptographic safety code generator and safety EEPROM area. The SAP51D-B-G1-R is designated for standard AS-i applications only and lacks the hardware blocks required for SIL2-certified safety communication.

What crystal frequencies are supported by the SAP51D-B-G1-R?

The SAP51D-B-G1-R supports 5.33 MHz and 16 MHz crystals with automatic frequency detection - no configuration register setting is needed. The oscillator circuit uses internal load capacitance, so external capacitors are typically unnecessary unless board parasitics require fine-tuning. Both frequencies comply with AS-i V3.0 timing budgets for master and slave operation.

How is the SAP51D-B-G1-R configured for Master vs. Slave operation?

The SAP51D-B-G1-R is configured via internal EEPROM contents loaded at power-up. Default behavior is Standard Slave Mode, but Master Mode can be enabled by writing the appropriate mode bit to the EEPROM configuration area using IDT's AS-Interface Programmer Kit USB or compatible handheld tool. Startup pin strapping (P[3:0]) provides fallback mode selection if EEPROM is blank or corrupted.

What package type and pin count does the SAP51D-B-G1-R use?

The SAP51D-B-G1-R uses a 16-pin SOP (Small Outline Package) with 300 mil body width and 1.27 mm lead pitch. This matches the SOP16 footprint defined in the datasheet (Figure 7.2 and Table 7.1), and is distinct from the SOP20 variant used by SAP51D-A-G1-R. Pin assignments are fixed and documented in Table 7.1 and Figure 7.2 of the official IDT datasheet.