Microchip Technology AT24C08D-MAHM-T

Overview

AT24C08D-MAHM-T from Microchip Technology is an I²C-compatible 8-Kbit serial EEPROM organized as 1,024 × 8 bits, operating from 1.7V to 3.6V with industrial temperature range (−40°C to +85°C), 1 MHz Fast Mode Plus support at 2.5–3.6V, and hardware write-protection via WP pin - used for nonvolatile parameter storage in embedded controllers, power management ICs, and sensor calibration modules.

For engineers reviewing the AT24C08D-MAHM-T datasheet, AT24C08D-MAHM-T pinout, AT24C08D-MAHM-T application, or AT24C08D-MAHM-T equivalent, this page delivers verified package mapping (8-pad UDFN), full pin function validation, endurance (1M cycles) and retention (100 years) specs, noise-immune I²C timing compliance, and real-world substitution guidance for industrial design-in.

Technical Context

The AT24C08D-MAHM-T implements a true I²C slave interface with Schmitt-triggered, filtered SCL/SDA inputs and open-drain bidirectional data transfer protocol. It supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) speeds across overlapping voltage ranges - 1.7–3.6V for first two modes, 2.5–3.6V for FM+ - with strict tLOW/tHIGH timing compliance and integrated spike suppression.

Internally, it uses a high-voltage generation circuit for EEPROM programming, POR-controlled reset behavior requiring ≥100 µs post-VCC stabilization before command acceptance, and a 64-page × 16-byte memory architecture enabling partial page writes. The WP pin provides hardware-level full-array write inhibition when pulled to VCC, while A2 serves as a hardwired device address bit for multi-device bus configuration.

Key Specifications

Pinout & Package

AT24C08D-MAHM-T is supplied in an 8-pad UDFN (Ultra Thin Dual Flat No-lead) package with exposed pad, rated for industrial temperature range (−40°C to +85°C). The exposed pad may be connected to GND or left floating per design requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C08D-MAHM-T, AT24C08C-SSHM-T offers identical functionality in a larger SOIC package for ease of handling, while M24C08-RMN6TP extends voltage range to 5.5V but sacrifices low-voltage operation below 2.5V - making AT24C08D-MAHM-T the sole choice for compact, ultra-low-voltage industrial designs.

Availability

AT24C08D-MAHM-T is available at Aetrix Electronics and suitable for industrial sensor calibration, smart energy metering, and embedded controller configuration requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant green packaging.

Supply support for AT24C08D-MAHM-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 ISO 9001-certified quality systems and broad industrial design-in support.

The AT24C08D belongs to Microchip's serial EEPROM product line, engineered for robust, low-power nonvolatile storage in space-constrained, noise-prone industrial and medical applications where data integrity and long-term reliability are mission-critical.

FAQ

What is the maximum I²C clock frequency supported by AT24C08D-MAHM-T?

AT24C08D-MAHM-T supports up to 1 MHz in Fast Mode Plus (FM+), but only when VCC is between 2.5V and 3.6V. At 1.7–3.6V, it operates at 400 kHz (Fast Mode) or 100 kHz (Standard Mode). The 1 MHz capability enables faster parameter loading in time-sensitive boot sequences, and timing compliance is validated per Table 4-3 in the official DS20006022A datasheet.

Does AT24C08D-MAHM-T require external pull-up resistors on SDA and SCL lines?

Yes, AT24C08D-MAHM-T requires external pull-up resistors on both SDA and SCL lines because SDA is open-drain and SCL is input-only. Microchip specifies maximum pull-up values of 10 kΩ for SDA and recommends 1.3 kΩ for 1 MHz operation. These resistors ensure proper signal rise times (tR ≤100 ns for FM+) and bus contention avoidance in multi-slave configurations.

How does the WP pin function on AT24C08D-MAHM-T, and what happens if it's left floating?

On AT24C08D-MAHM-T, the WP pin disables all write operations when pulled to VCC, and enables normal writes when grounded. If left floating, it is internally pulled down to GND - allowing writes - but Microchip strongly recommends tying it to a known state due to capacitive coupling risks in noisy environments. This behavior is documented in Section 2.5 and Table 2-2 of the DS20006022A datasheet.

What is the memory organization of AT24C08D-MAHM-T, and how does page writing work?

AT24C08D-MAHM-T organizes its 8-Kbit memory as 64 pages of 16 bytes each. Page write mode allows up to 16 bytes to be written in a single I²C transaction, with partial writes permitted - e.g., writing 5 bytes starting at byte 12 of a page. Each write cycle completes within 5 ms maximum, and the device supports random and sequential read modes for flexible data access patterns.

Is AT24C08D-MAHM-T qualified for industrial temperature operation, and what are its absolute maximum ratings?

Yes, AT24C08D-MAHM-T is fully specified for industrial temperature range (−40°C to +85°C) per Table 4-1. Its absolute maximum ratings include VCC up to 4.1V, pin voltage from −0.6V to +4.1V, and operating junction temperature up to +125°C. Exceeding these limits may cause permanent damage, and functional operation outside the DC/AC operating range (1.7–3.6V, −40°C to +85°C) is not guaranteed.