Microchip Technology 47L04-I/P

Overview

47L04-I/P from Microchip Technology is a 4 Kbit (512 × 8) I²C serial EERAM combining volatile SRAM with nonvolatile EEPROM backup. It operates from 2.7V–3.6V, supports up to 1 MHz I²C, and delivers automatic power-loss data retention via VCAP capacitor-assisted store/recall. Used in industrial sensor nodes requiring infrequent but critical state preservation across power cycles.

For engineers reviewing the 47L04-I/P datasheet, 47L04-I/P pinout, 47L04-I/P application, or 47L04-I/P equivalent, this page provides verified functional identity, validated I²C timing behavior, confirmed auto-store trip voltage (2.4–2.6 V), real-world endurance (1M EEPROM store cycles), and precise package mapping to 8-lead PDIP - all extracted from Microchip DS20005371E.

Technical Context

The 47L04-I/P implements a dual-memory architecture: 512 × 8-bit SRAM for high-speed read/write access and on-chip EEPROM for nonvolatile backup. Store and recall operations are triggered by VCC fall/rise crossing VTRIP (2.4–2.6 V), hardware pulse on HS pin, or software command (0x33/0xDD) to COMMAND register.

I²C interface complies with standard 100 kHz/400 kHz/1 MHz modes, features Schmitt-trigger inputs (SDA/SCL/HS), supports cascading up to four devices via A1/A2 address pins, and enforces write protection through BP<2:0> bits in the STATUS register (00h) - configurable from 1/64 to full array lock.

Key Specifications

Pinout & Package

47L04-I/P is supplied in an 8-lead PDIP (Plastic Dual In-line Package) with 0.3-inch body width and standard through-hole mounting footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 47L04-I/SN, the 47L04-I/P offers identical electrical and functional behavior but enables through-hole prototyping and legacy manufacturing; versus 47L16-I/P, it trades capacity for lower cost and reduced standby current in memory-light designs.

Availability

47L04-I/P is available at Aetrix Electronics and suitable for industrial sensor nodes, smart energy meters, and programmable logic controller modules requiring stable component supply with guaranteed long-term availability.

Supply support for 47L04-I/P 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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions for industrial, automotive, and consumer markets.

The 47L04-I/P belongs to Microchip's EERAM product line - designed specifically to replace battery-backed SRAM and discrete EEPROM+SRAM combinations in systems demanding seamless, autonomous nonvolatile data retention.

FAQ

What is the exact memory organization of the 47L04-I/P?

The 47L04-I/P contains 512 × 8-bit SRAM (4,096 bits total), internally organized as a linear byte-addressable array. The EEPROM backup mirrors this structure, storing the same 512 bytes. Addressing uses two-byte addressing (high/low) per I²C protocol, with the internal Address Pointer incrementing automatically during sequential reads/writes. This layout is fixed and confirmed in DS20005371E Section 2.3.

How does the VCAP capacitor affect 47L04-I/P operation?

The VCAP pin on the 47L04-I/P requires a 5–6.8 µF tantalum or ceramic capacitor to enable Auto-Store functionality. When VCC drops below the 2.4–2.6 V trip threshold, charge stored in VCAP sustains internal circuitry long enough to complete the ≤8 ms SRAM→EEPROM transfer. Without VCAP, Auto-Store must be disabled (ASE = 0) and manual store via HS pin or software command must be used - otherwise EEPROM corruption may occur.

Can the 47L04-I/P be used without external pull-up resistors on SDA/SCL?

No - the 47L04-I/P requires external pull-up resistors on both SDA and SCL lines, as its I²C interface uses open-drain outputs. Typical values are 2.2 kΩ to 4.7 kΩ for 1 MHz operation, sized per bus capacitance (≤400 pF per DS20005371E Table 1-1). Omitting pull-ups prevents proper logic level establishment and violates I²C bus specification, causing communication failure.

What happens if a write attempt targets a protected SRAM block in the 47L04-I/P?

If the 47L04-I/P STATUS register BP<2:0> bits configure write protection and a host attempts to write to a locked address range, the device will not acknowledge the final data byte (NoACK), terminate the current operation, and leave the Address Pointer unchanged. No data is written, and the SRAM remains unmodified - providing hardware-enforced data integrity without MCU intervention.

Is the 47L04-I/P AEC-Q100 qualified?

No - the 47L04-I/P is specified for Industrial (-40°C to +85°C) and Extended (-40°C to +125°C) temperature ranges but is not AEC-Q100 qualified. While the 47L04 family includes AEC-Q100 variants (e.g., 47L04T-I/P), the standard 47L04-I/P part number denotes industrial-grade qualification only. Automotive designs require explicit validation of the 'T' suffix variant.