Microchip Technology AT24C04C-MAPD-T

Overview

AT24C04C-MAPD-T from Microchip Technology (formerly Atmel) is a 4-kilobit automotive-grade serial EEPROM organized as 512 words × 8 bits, supporting I²C-compatible 2-wire interface at up to 400 kHz, with 16-byte page write capability, hardware write protection via WP pin, and operation from 2.5V to 5.5V. It is used for nonvolatile parameter storage in engine control units, airbag modules, and ADAS sensors requiring AEC-Q100 Grade 1 reliability.

For engineers reviewing the AT24C04C-MAPD-T datasheet, AT24C04C-MAPD-T pinout, AT24C04C-MAPD-T application, or AT24C04C-MAPD-T equivalent, key selection criteria include its -40°C to +125°C temperature range, 1,000,000 write cycles endurance, 100-year data retention, UDFN-8 package footprint, and compatibility with microcontroller-based automotive subsystems requiring robust, low-power configuration memory.

Technical Context

The AT24C04C-MAPD-T implements a fully synchronous I²C slave interface with Schmitt-triggered SCL/SDA inputs for noise immunity, supports both byte and 16-byte page writes with self-timed internal write cycle (≤5 ms), and uses hardwired A2/A1 address pins to enable up to four devices on a single bus. Its internal architecture includes a high-voltage pump for EEPROM programming and automatic address rollover during sequential reads.

It features dedicated Write Protect (WP) logic that disables all write operations when pulled high, supports acknowledge polling for write completion detection, and maintains an internal address counter across power cycles as long as VCC remains stable - enabling seamless current-address read operations after power-up or wake-up events.

Key Specifications

Pinout & Package

AT24C04C-MAPD-T is housed in an 8-pad Ultra Thin Dual No-Lead (UDFN) package measuring 2.0 mm × 3.0 mm with 0.50 mm pitch (package code 8MA2). This RoHS-compliant, lead-free/halogen-free package supports automated surface-mount assembly and provides thermal performance suitable for high-density automotive PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M24C04-RMN6TP and R1EX24004ASAS0I, the AT24C04C-MAPD-T uniquely supports full AEC-Q100 Grade 1 operation (-40°C to +125°C) in the smallest footprint (UDFN-8), making it the only option qualified for direct integration into engine management and brake-by-wire ECUs without thermal derating.

Availability

AT24C04C-MAPD-T is available at Aetrix Electronics and suitable for engine control units, ADAS sensor modules, and electronic power steering systems requiring stable component supply across extended automotive lifecycles.

Supply support for AT24C04C-MAPD-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

Microchip Technology is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with deep expertise in automotive qualification and long-term product support.

The AT24C04C-MAPD-T belongs to Microchip's automotive serial EEPROM product line, designed specifically for AEC-Q100-compliant nonvolatile data storage in harsh-temperature vehicle subsystems where reliability, low power, and I²C interoperability are mandatory.

FAQ

What is the maximum I²C clock frequency supported by the AT24C04C-MAPD-T?

The AT24C04C-MAPD-T supports a maximum I²C clock frequency of 400 kHz when operating at VCC = 2.5V, as specified in the AC characteristics table. This matches standard Fast-mode I²C timing and ensures interoperability with automotive microcontrollers such as NXP S32K and Infineon AURIX families without requiring clock stretching or custom timing adjustments.

Does the AT24C04C-MAPD-T require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C04C-MAPD-T requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Typical values range from 1.3 kΩ (for 2.5V/5.5V operation) to 10 kΩ (for 1.7V operation), as defined in the AC measurement conditions section of the datasheet.

How does the Write Protect (WP) pin function on the AT24C04C-MAPD-T?

When the WP pin of the AT24C04C-MAPD-T is driven high (to VCC), it disables all write operations to the entire memory array - including byte, page, and sequential writes - while preserving full read functionality. When WP is grounded, normal read/write operations resume. This hardware-level protection prevents corruption during power-up, reset, or EMI events.

What package type is used for the AT24C04C-MAPD-T, and what are its dimensions?

The AT24C04C-MAPD-T uses an 8-pad Ultra Thin Dual No-Lead (UDFN) package designated as 8MA2, measuring 2.0 mm × 3.0 mm with 0.50 mm pin pitch. Its low-profile construction (0.55 mm max height) supports high-density automotive PCB layouts and automated reflow assembly per JEDEC J-STD-020 moisture sensitivity level 3.

Is the AT24C04C-MAPD-T compatible with other devices in the AT24CxxC family?

Yes, the AT24C04C-MAPD-T shares identical I²C protocol, pinout, and command structure with AT24C01C, AT24C02C, and AT24C08C variants. However, memory size, page length (16 bytes vs. 8 bytes), and address pin usage differ - for example, A0 is NC on AT24C04C-MAPD-T but active on AT24C01C/02C, requiring schematic review before substitution.