Microchip Technology 47L04T-I/SN

Overview

47L04T-I/SN from Microchip Technology is a 4 Kbit I²C serial EERAM (SRAM with integrated EEPROM backup), organized as 512 × 8 bits, operating from 2.7V–3.6V, supporting up to 1 MHz I²C interface, and featuring automatic power-loss store/recall via external VCAP capacitor. It serves as nonvolatile data buffer in industrial control modules where SRAM speed and EEPROM endurance are jointly required.

For engineers reviewing the 47L04T-I/SN datasheet, 47L04T-I/SN pinout, 47L04T-I/SN application, or 47L04T-I/SN equivalent, key selection considerations include its 8 ms max store time, software/hardware-triggered store capability, 1 million EEPROM store cycles, and AEC-Q100-qualified operation across –40°C to +85°C.

Technical Context

The 47L04T-I/SN implements a dual-memory architecture: volatile 512×8-bit SRAM for high-speed read/write access and nonvolatile EEPROM for persistent backup. Store and recall operations are managed by dedicated control logic that monitors VCC and VCAP voltage thresholds (VTRIP = 2.4–2.6 V) to trigger auto-store on power-down and auto-recall on power-up.

It uses standard I²C protocol with 7-bit client address (1010 A2 A1 0), supports byte/sequential reads/writes, and includes a write-protected STATUS register (00h) and write-only COMMAND register (55h) for configuring ASE, BP bits, and initiating software store/recall commands.

Key Specifications

Pinout & Package

47L04T-I/SN is housed in an 8-lead SOIC package (SN suffix), with gull-wing leads, 1.27 mm pitch, and JEDEC MS-012AC footprint. Pin functions are electrically validated per DS20005371E.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar EERAM applications.

Compared with 47L04T-I/SN, the 47L04-I/P offers identical functionality in through-hole form for development flexibility, while the 47L16T-I/SN scales capacity within the same footprint - enabling seamless migration paths without redesigning power or signal integrity.

Availability

47L04T-I/SN is available at Aetrix Electronics and suitable for industrial PLC data logging, smart energy meter configuration storage, and automotive body control modules requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.

Supply support for 47L04T-I/SN 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

Microchip Technology Inc. is a leading provider of microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 47L04T-I/SN belongs to Microchip's EERAM product line - engineered specifically for applications needing both SRAM-speed access and EEPROM-level nonvolatility without external backup power sources.

FAQ

What is the primary function of the 47L04T-I/SN?

The 47L04T-I/SN is a 4 Kbit I²C serial EERAM that combines fast SRAM (512 × 8 bits) with integrated EEPROM backup. Its core function is to provide instantaneous read/write access during normal operation and automatically preserve SRAM contents to EEPROM upon power loss - eliminating the need for external batteries or capacitors beyond the required VCAP.

How does the 47L04T-I/SN handle power failure events?

The 47L04T-I/SN monitors VCC and VCAP voltage levels. When VCC drops below the trip threshold (2.4–2.6 V), it triggers automatic store of SRAM contents to EEPROM using charge stored in the external VCAP capacitor. This process completes in ≤8 ms and requires no host intervention - ensuring data integrity even during abrupt power loss.

Can the 47L04T-I/SN be used without connecting a VCAP capacitor?

Yes, but only if Auto-Store is disabled (ASE = 0) and VCAP is tied directly to VCC. In this mode, manual store must be initiated via the HS pin or software command. Omitting VCAP while enabling Auto-Store risks EEPROM data corruption during power loss - Microchip explicitly requires VCAP for reliable auto-store operation.

What I²C address does the 47L04T-I/SN use, and how is it configured?

The 47L04T-I/SN uses a 7-bit I²C client address formed as 1010 A2 A1 0, where A2 and A1 are hardware pins tied high or low to select one of four possible addresses (0xA0, 0xA2, 0xA4, or 0xA6). The R/W bit (LSB) determines read (1) or write (0) operation - enabling up to four devices on the same I²C bus without address conflict.

Is the 47L04T-I/SN suitable for automotive applications?

Yes - the 47L04T-I/SN carries the "I" temperature grade (–40°C to +85°C) and is AEC-Q100 qualified. It meets automotive reliability standards for data retention, endurance, and ESD immunity, making it appropriate for body control modules, infotainment configuration storage, and other under-dash applications where battery-backed RAM is impractical.