Microchip Technology AT24C04C-MAHM-E

Overview

AT24C04C-MAHM-E from Microchip Technology is a 4-Kbit I²C-compatible serial EEPROM organized as 512 × 8 bits, operating from 1.7V to 5.5V with industrial temperature range (−40°C to +85°C), 1 MHz Fast Mode Plus support at ≥2.5V, and hardware write protection via WP pin - used for configuration storage in embedded controllers, sensor calibration data retention, and boot parameter backup.

For engineers reviewing the AT24C04C-MAHM-E datasheet, AT24C04C-MAHM-E pinout, AT24C04C-MAHM-E application, or AT24C04C-MAHM-E equivalent, key selection considerations include I²C bus voltage compatibility (1.7–5.5V), page-write timing (≤5 ms), standby current (≤6 μA), and 8-pad UDFN package footprint constraints.

Technical Context

The AT24C04C-MAHM-E implements a two-wire I²C interface with Schmitt-triggered, filtered SDA/SCL inputs for noise immunity, supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) clock rates depending on VCC, and uses internal address decoding with A1/A2 pins enabling up to four devices on one bus. It features an open-drain bidirectional SDA line requiring external pull-up and a dedicated WP pin that disables all writes when tied to VCC.

Memory is organized into 32 pages of 16 bytes each, supporting partial and full-page writes, random/sequential reads, and self-timed internal write cycles. Power-on reset (POR) ensures command rejection until VCC stabilizes above 1.5 V and tPUP (100 µs) elapses, preventing spurious writes during power ramp.

Key Specifications

Pinout & Package

AT24C04C-MAHM-E is packaged in an 8-pad UDFN (Ultra Thin DFN) with exposed pad, measuring 2.0 mm × 1.6 mm × 0.55 mm (max), RoHS-compliant and halide-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C04C-MAHM-E, AT24C04D-MAHM-E offers tighter VCC tolerance and stronger ESD immunity without layout change, while M24C04-RMN6TP trades FM+ speed and century-grade retention for lower unit cost in TSSOP - making AT24C04C-MAHM-E optimal for new designs needing guaranteed 100-year data integrity and 1 MHz configurability.

Availability

AT24C04C-MAHM-E is available at Aetrix Electronics and suitable for industrial sensor nodes, medical diagnostic devices, smart energy meters, automotive body control modules, and IoT edge gateways requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for AT24C04C-MAHM-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 emphasis on reliability, low-power design, and industrial-grade qualification.

The AT24C04C-MAHM-E belongs to Microchip's AT24Cxx family of I²C serial EEPROMs, engineered for robust nonvolatile storage in space-constrained, low-power embedded systems where data integrity across decades is mandatory.

FAQ

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

The AT24C04C-MAHM-E supports 100 kHz (Standard mode), 400 kHz (Fast mode), and 1 MHz (Fast Mode Plus) - but FM+ requires VCC ≥2.5 V. At 1.7–2.4 V, only Standard and Fast modes are valid. This allows designers to scale throughput based on supply rail without changing firmware I²C timing parameters.

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

Yes, the AT24C04C-MAHM-E requires external pull-up resistors on both SDA and SCL. SDA is open-drain and must use ≤10 kΩ; SCL is input-only but also needs pull-up for bus idle state. Recommended values are 4 kΩ for 400 kHz and 1.3 kΩ for 1 MHz to meet rise-time specs under 100 pF bus capacitance.

How does the Write-Protect (WP) pin function on the AT24C04C-MAHM-E?

When WP is tied to VCC, the AT24C04C-MAHM-E inhibits all write operations including byte/page writes and write-enable commands - protecting the entire memory array. When WP is at GND, writes are enabled. If left floating, internal pull-down defaults it to GND, but Microchip recommends hardwiring for deterministic behavior.

What is the memory organization of the AT24C04C-MAHM-E?

The AT24C04C-MAHM-E contains 4,096 bits organized as 512 words × 8 bits, segmented into 32 pages of 16 bytes each. This structure enables efficient page writes (up to 16 bytes per command) and supports both random and sequential read access - ideal for storing structured configuration data with minimal bus overhead.

Is the AT24C04C-MAHM-E compatible with standard I²C protocol stacks?

Yes, the AT24C04C-MAHM-E is fully compliant with the NXP I²C-bus specification, supporting START/STOP conditions, ACK/NACK handshaking, 7-bit addressing (1010_A2_A1_R/W), and repeated START. No custom drivers are needed - standard HAL or bare-metal I²C implementations work out-of-box.