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Home > Products > Integrated Circuits (ICs) > Interface > Specialized

Renesas SAP51D-A-G1-T

Name: SAP51D-A-G1-T
Brand: Renesas
SKU: SAP51D-A-G1-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SAP51D-A-G1-T

Manufacturer:: Renesas

Category:: Specialized

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: SAP51D-A-G1-T.pdf

Description:: IC INTERFACE SPECIALIZED V3.0

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Product details

Overview

SAP51D-A-G1-T 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-A-G1-T datasheet, SAP51D-A-G1-T pinout, SAP51D-A-G1-T application, or SAP51D-A-G1-T equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (Standard Slave, Master), and real-world AS-i system integration guidance - including EEPROM-programmable configuration, burst protection, and dual LED status indication per V3.0 requirements.

Technical Context

The SAP51D-A-G1-T implements a full AS-i physical layer with integrated receiver, transmitter, and electronic inductor (55mA sink capability). Its internal oscillator supports automatic 5.33/16MHz crystal frequency detection, and it includes clock and communication watchdogs for fault resilience.

It features programmable operational modes (Standard Slave or Master) stored in on-chip EEPROM, with dedicated parameter/data ports (P[3:0], D[3:0]), DSTBn/PSTBn control signals, and PFAULT fault input. The device uses LTGP/LTGN as AS-i bus voltage terminals (16–34V DC) and provides UOUT (5V) and U5R (5V) regulated outputs.

Key Specifications

Parameter	Value and Actual Design Meaning
AS-i Compliance	Full compliance with AS-Interface Complete Specification V3.0 - ensures interoperability with certified masters, slaves, and safety devices in industrial networks.
Operating Voltage Range	16–34V DC on LTGP–LTGN bus pins - powers AS-i network and enables direct connection to standard industrial 24V supply rails.
Electronic Inductor Drive	55mA continuous sink current - eliminates need for external inductor in AS-i bus driver stage, reducing BOM count and board space.
Crystal Support	5.33MHz or 16MHz crystals with auto-detection - allows flexible timing source selection without firmware or hardware changes.
Temperature Range	-25°C to +85°C ambient - qualified for deployment in factory-floor environments including control cabinets and field-mounted I/O modules.
Digital I/O Drive	10mA sink capability on D[3:0] and P[3:0] - sufficient to directly drive optocouplers, logic-level inputs, or small LEDs without external buffers.
EEPROM Storage	On-chip nonvolatile memory for mode configuration, ID code, and user parameters - enables field reprogramming via handheld or USB programmer without component replacement.

Pinout & Package

SAP51D-A-G1-T is supplied in SOP20 (300 mil) package with 20-pin surface-mount footprint and standard gull-wing lead form. Pin assignments are defined per Figure 7.1 and Table 7.1 of the official datasheet.

Pin/Terminal	Circuit Role	Design Meaning
LTGP / LTGN	AS-i Bus Terminals	High-side (LTGP) and low-side (LTGN) connections to two-wire AS-i cable - carry combined 24V power and Manchester-encoded data.
UOUT / U5R	Regulated Outputs	UOUT supplies 5V @ up to 50mA for local logic; U5R supplies isolated 5V @ up to 50mA for external interface circuitry.
D[3:0] / P[3:0]	Data & Parameter Ports	Four-bit bidirectional data port (D) and four-bit parameter port (P) - used for I/O exchange and mode/configuration control in slave/master operation.
DSTBn / PSTBn	Strobe Inputs	Active-low strobes synchronizing data capture on D[3:0] and P[3:0]; DSTBn triggers data read/write, PSTBn controls parameter updates.
LED1 / LED2	Status Outputs	Open-drain outputs driving AS-i-compliant status LEDs - support all V3.0-defined indication modes (e.g., OK, ERROR, ADDR, SAFETY).
PFAULT	Fault Input	Active-high input signaling external fault condition (e.g., overtemperature, short-circuit) - forces device into safe state and updates status registers.
OSC1 / OSC2	Crystal Interface	Connects to external quartz crystal (5.33 or 16MHz); internal oscillator circuit provides clock for AS-i timing and protocol engine.
CDC	Current Detection	Monitors AS-i bus current for short-circuit detection and loopback timing calibration - critical for reliable telegram transmission and collision avoidance.

Key Features

Feature	Design Value
Universal Mode Support	Configurable as Standard Slave or Master via EEPROM - eliminates need for separate part numbers for different node roles in AS-i system design.
Integrated Electronic Inductor	55mA built-in current sink replaces discrete inductor - reduces bill-of-materials, improves EMI performance, and simplifies PCB layout for AS-i bus interface.
V3.0 LED Status Compliance	Dual open-drain LED drivers supporting all AS-Interface Complete Specification V3.0 status indication patterns - enables direct connection to standard AS-i status LEDs without external logic.
Burst Protection Circuitry	On-die transient suppression on LTGP/LTGN - withstands repetitive 50µs/0.5Hz pulses up to 50V, meeting industrial surge immunity requirements without external TVS.
Automatic Crystal Detection	Hardware-based recognition of 5.33MHz or 16MHz crystals at power-up - removes software dependency and ensures correct timing initialization across production batches.

Applications

AS-i Slave Modules	AS-i Master Modules
Use Scenario: Connecting binary sensors (e.g., limit switches, photoelectric sensors) and actuators (e.g., solenoid valves, indicator lamps) to an AS-i network in packaging machinery. IC Role / Device Role / Timing Role: Physical-layer transceiver handling Manchester encoding/decoding, bus power regulation, and I/O data framing for up to 4-bit input/output per slave address. Use Value: Enables cost-effective, two-wire wiring topology with integrated power delivery - reducing installation time and cable costs by >40% versus traditional discrete I/O wiring.	Use Scenario: Central controller in automotive assembly line PLC systems managing up to 31 AS-i slaves for real-time monitoring and actuation. IC Role / Device Role / Timing Role: AS-i master PHY implementing telegram generation, collision detection, and cyclic polling with <1ms response latency per slave. Use Value: Provides deterministic, low-jitter communication timing and built-in watchdogs - ensuring compliance with AS-i V3.0 cycle time guarantees (<5ms for 31 slaves).
Industrial I/O Gateways	Modular Fieldbus Couplers
Use Scenario: Retrofitting legacy analog/digital I/O modules with AS-i connectivity in food & beverage processing lines requiring IP67-rated enclosures. IC Role / Device Role / Timing Role: Bridge between microcontroller-based gateway logic and AS-i bus - managing UART-based host interface, EEPROM configuration, and dual LED status reporting. Use Value: Supports field reconfiguration via handheld programmer - enabling rapid commissioning and diagnostics without firmware update or hardware change.	Use Scenario: DIN-rail mounted coupler linking AS-i networks to higher-level fieldbuses (e.g., Profibus, EtherNet/IP) in chemical plant distributed control systems. IC Role / Device Role / Timing Role: Standalone AS-i master node providing synchronized data acquisition from multiple slaves and timestamped event reporting. Use Value: Delivers robust EMC performance (IEC 61000-4-2/4-4/4-5 compliant) and thermal protection - sustaining operation in electrically noisy, high-temperature cabinet environments.

AS-i Slave Modules

AS-i Master Modules

Use Scenario: Connecting binary sensors (e.g., limit switches, photoelectric sensors) and actuators (e.g., solenoid valves, indicator lamps) to an AS-i network in packaging machinery.

IC Role / Device Role / Timing Role: Physical-layer transceiver handling Manchester encoding/decoding, bus power regulation, and I/O data framing for up to 4-bit input/output per slave address.

Use Value: Enables cost-effective, two-wire wiring topology with integrated power delivery - reducing installation time and cable costs by >40% versus traditional discrete I/O wiring.

Use Scenario: Central controller in automotive assembly line PLC systems managing up to 31 AS-i slaves for real-time monitoring and actuation.

IC Role / Device Role / Timing Role: AS-i master PHY implementing telegram generation, collision detection, and cyclic polling with <1ms response latency per slave.

Use Value: Provides deterministic, low-jitter communication timing and built-in watchdogs - ensuring compliance with AS-i V3.0 cycle time guarantees (<5ms for 31 slaves).

Industrial I/O Gateways

Modular Fieldbus Couplers

Use Scenario: Retrofitting legacy analog/digital I/O modules with AS-i connectivity in food & beverage processing lines requiring IP67-rated enclosures.

IC Role / Device Role / Timing Role: Bridge between microcontroller-based gateway logic and AS-i bus - managing UART-based host interface, EEPROM configuration, and dual LED status reporting.

Use Value: Supports field reconfiguration via handheld programmer - enabling rapid commissioning and diagnostics without firmware update or hardware change.

Use Scenario: DIN-rail mounted coupler linking AS-i networks to higher-level fieldbuses (e.g., Profibus, EtherNet/IP) in chemical plant distributed control systems.

IC Role / Device Role / Timing Role: Standalone AS-i master node providing synchronized data acquisition from multiple slaves and timestamped event reporting.

Use Value: Delivers robust EMC performance (IEC 61000-4-2/4-4/4-5 compliant) and thermal protection - sustaining operation in electrically noisy, high-temperature cabinet environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ASI4U	Single-chip AS-i master/slave IC with integrated microcontroller core; requires no external MCU but has fixed firmware.	Targeted at fully self-contained AS-i nodes where host processor is unnecessary; lacks user-programmable EEPROM flexibility of SAP51D-A-G1-T.	Select ASI4U when minimizing system component count is prioritized over field reconfigurability and custom protocol extensions.
SAP5SD-A-G1-T	Functionally identical silicon with integrated Safety Mode (SAP5S variant); pin-compatible but includes cryptographic safety code generator.	Required only for SIL2/PLd-certified safety subsystems (e.g., emergency stop chains); not needed for standard automation I/O.	Choose SAP5SD-A-G1-T exclusively when AS-i Safety Mode compliance per EN 61508/IEC 61511 is mandated - otherwise SAP51D-A-G1-T offers optimal cost/performance balance.

Compared with ASI4U and SAP5SD-A-G1-T, the SAP51D-A-G1-T provides the most flexible, MCU-dependent AS-i PHY solution - offering full EEPROM programmability, proven thermal and burst resilience, and seamless integration into existing microcontroller-based architectures without safety overhead.

Availability

SAP51D-A-G1-T is available at Aetrix Electronics and suitable for AS-i slave modules, AS-i master controllers, and industrial I/O gateways requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for SAP51D-A-G1-T 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, memory interface, RF, and industrial communications ICs.

The SAP51/SAP5S product line was developed specifically for robust, low-cost AS-Interface physical layer implementation in harsh industrial environments - emphasizing EMC resilience, wide temperature operation, and field-programmable configurability.

FAQ

What is the primary function of the SAP51D-A-G1-T in an AS-i network?

The SAP51D-A-G1-T serves as the physical-layer transceiver for AS-Interface networks, handling Manchester encoding/decoding, bus power regulation (via LTGP/LTGN), and digital I/O interfacing. It functions as either a master or slave node depending on EEPROM configuration, and directly drives the two-wire AS-i cable carrying both power and data. Its role is foundational to AS-i communication integrity and timing accuracy.

Does the SAP51D-A-G1-T support AS-i Safety Mode?

No, the SAP51D-A-G1-T does not support AS-i Safety Mode. That functionality is exclusive to the SAP5S variant (e.g., SAP5SD-A-G1-T), which includes an integrated cryptographic safety code generator. The SAP51D-A-G1-T is designated for standard AS-i applications compliant with V3.0 but without safety certification requirements such as SIL2 or PLd.

What crystal frequencies are supported by the SAP51D-A-G1-T?

The SAP51D-A-G1-T supports both 5.33MHz and 16MHz crystals, with automatic frequency detection at power-up. This dual-frequency capability allows designers to select based on system timing precision needs and EMI considerations - 5.33MHz for lower radiated emissions, 16MHz for tighter timing margins in high-speed polling scenarios - without hardware or firmware modification.

How is configuration data stored and updated on the SAP51D-A-G1-T?

Configuration data for the SAP51D-A-G1-T - including operational mode (Slave/Master), ID code, and parameter settings - is stored in on-chip EEPROM. Programming is performed externally using IDT's AS-Interface Programmer Kit USB or compatible handheld tools. The EEPROM supports field updates without soldering or component replacement, enabling post-deployment reconfiguration and diagnostics.

What are the key thermal and electrical protections built into the SAP51D-A-G1-T?

The SAP51D-A-G1-T integrates thermal protection with cut-off at 150°C, burst protection rated for 50V/50µs pulses on LTGP/LTGN, and ESD tolerance of 1500V HBM. It also features clock and communication watchdogs to detect and recover from timing faults. These protections ensure reliable operation in industrial settings with voltage transients, temperature fluctuations, and electromagnetic noise - eliminating need for most external protection components.

SAP51D-A-G1-T Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Active

Applications:: Actuator Sensor Interface

Interface:: AS-i

Voltage - Supply:: 16V ~ 34V

Supplier Device Package:: 20-SOIC

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

SAP51D-A-G1-T FAQ

1.How can I place an order for SAP51D-A-G1-T through Aetrix?

Please submit a Request for Quotation (RFQ) for SAP51D-A-G1-T 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 SAP51D-A-G1-T reliable?

The price and inventory of SAP51D-A-G1-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SAP51D-A-G1-T is usually 5 days.

3.What payment methods are accepted for SAP51D-A-G1-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SAP51D-A-G1-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SAP51D-A-G1-T?

SAP51D-A-G1-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SAP51D-A-G1-T 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 SAP51D-A-G1-T?

For technical support, including SAP51D-A-G1-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SAP51D-A-G1-T requirements.

6.How does Aetrix verify that SAP51D-A-G1-T is sourced from the original manufacturer or authorized distributors?

All SAP51D-A-G1-T 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 SAP51D-A-G1-T meets industry standards.

7.What is the process for return or replacement of SAP51D-A-G1-T?

All SAP51D-A-G1-T units undergo pre-shipment inspection (PSI). If there is an issue with SAP51D-A-G1-T, 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 SAP51D-A-G1-T part is unused and in its original packaging.

Return procedure for SAP51D-A-G1-T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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