Microchip Technology AT24C04C-MAPD-E

Overview

AT24C04C-MAPD-E from Microchip Technology (formerly Atmel) is a 4-kilobit automotive-grade serial EEPROM organized as 512 × 8 bits, supporting I²C-compatible 2-wire interface at up to 400 kHz, with 1.7V–5.5V operation, -40°C to +125°C Grade 1 temperature range, and hardware write protection via WP pin. It is used for nonvolatile parameter storage in engine control units, ADAS sensor modules, and infotainment system configuration memory.

For engineers reviewing the AT24C04C-MAPD-E datasheet, AT24C04C-MAPD-E pinout, AT24C04C-MAPD-E application, or AT24C04C-MAPD-E equivalent, key selection factors include its AEC-Q100 Grade 1 qualification, 16-byte page write capability, 5 ms max self-timed write cycle, Schmitt-trigger inputs for noise immunity, and UDFN-8 package compatibility with space-constrained automotive PCB layouts.

Technical Context

The AT24C04C-MAPD-E implements a standard I²C protocol with fixed 7-bit device address prefix '1010', where A2 and A1 pins determine hardwired slave addressing (A0 is NC). Its internal architecture includes an 8-bit data register, address counter, EEPROM array with high-voltage pump for write/erase, and serial control logic synchronized to SCL.

It supports byte and 16-byte page writes, current/random/sequential reads, and acknowledge polling during write cycles. The device enters low-power standby mode after Stop condition or power-up, with typical ISB3 = 4.0 μA at 5.0 V and full functionality retained across its extended automotive temperature range.

Key Specifications

Pinout & Package

AT24C04C-MAPD-E uses an 8-pad UDFN package (2.0 mm × 3.0 mm, 0.5 mm pitch), optimized for compact automotive PCBs. Pin 1 is marked by a dot or beveled corner; the package is lead-free and halogen-free per RoHS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M24C04-RMN6TP and CAT24C04HU4IGT3, AT24C04C-MAPD-E uniquely delivers full AEC-Q100 Grade 1 qualification (-40°C to +125°C) in the same UDFN-8 package, making it the only option qualified for direct integration into engine, transmission, and brake control ECUs without derating.

Availability

AT24C04C-MAPD-E is available at Aetrix Electronics and suitable for automotive powertrain control, ADAS sensor calibration, and body electronics requiring stable component supply across extended temperature and voltage ranges.

Supply support for AT24C04C-MAPD-E 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 and industrial embedded systems.

The AT24CxxC family was designed specifically for automotive applications demanding AEC-Q100 qualification, low-voltage operation, and robust I²C communication in harsh environments - directly addressing needs in ECU, ADAS, and body electronics.

FAQ

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

The AT24C04C-MAPD-E supports a maximum I²C clock frequency of 400 kHz at VCC ≥ 2.5 V. This allows efficient configuration loading in automotive subsystems while maintaining timing margins for noise resilience. The device meets standard-mode I²C timing requirements including tLOW (1200 ns min), tHIGH (600 ns min), and tSU.DAT (100 ns min), ensuring interoperability with common automotive microcontrollers.

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

Yes, AT24C04C-MAPD-E requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and speed; for 400 kHz operation with ≤400 pF total bus capacitance, 4.7 kΩ is recommended. These resistors ensure proper logic high levels and meet rise time specifications (tR ≤ 300 ns).

How is device addressing configured for AT24C04C-MAPD-E on an I²C bus?

AT24C04C-MAPD-E uses a 7-bit I²C slave address with prefix '1010', followed by two hardware-configurable bits (A2 and A1); A0 is not connected. This allows up to four AT24C04C-MAPD-E devices on the same bus. Valid addresses are 0x50–0x53 depending on A2/A1 logic levels. The eighth bit indicates R/W direction, matching standard I²C addressing conventions used by automotive MCUs.

What is the purpose of the WP pin on AT24C04C-MAPD-E, and how should it be used?

The WP (Write Protect) pin on AT24C04C-MAPD-E provides hardware-level write inhibition. When pulled high to VCC, it disables all write operations to the entire memory array; when grounded, normal read/write functions operate. In automotive systems, WP is commonly tied to a system supervisor IC output that asserts during brown-out or reset, preventing corruption during unstable power conditions - a critical feature for AT24C04C-MAPD-E reliability.

Is AT24C04C-MAPD-E pin-compatible with other packages in the AT24C04C family?

No - AT24C04C-MAPD-E uses an 8-pad UDFN package (2.0 mm × 3.0 mm), while AT24C04C-SSPD-T uses 8-lead SOIC and AT24C04C-XPD-T uses 8-lead TSSOP. Although all share identical pin functions and ordering code logic (e.g., 'MAPD' = UDFN + Grade 1 + 2.5–5.5V), mechanical dimensions, solder pad layout, and thermal characteristics differ. PCB layout must match the specific package; no physical interchangeability exists between AT24C04C-MAPD-E and SOIC/TSSOP variants.