Microchip Technology AT24C08D-MAHM-E

Overview

AT24C08D-MAHM-E from Microchip Technology is an I²C-compatible 8-Kbit serial EEPROM organized as 1,024 × 8 bits, operating from 1.7V to 3.6V across -40°C to +85°C industrial temperature range. It supports 100 kHz standard mode, 400 kHz fast mode, and 1 MHz fast mode plus (FM+) I²C communication, with hardware write protection via WP pin and ultra-low standby current of 0.8 μA max - deployed in embedded system configuration storage, sensor calibration data retention, and power-fail-safe parameter backup.

For engineers reviewing the AT24C08D-MAHM-E datasheet, AT24C08D-MAHM-E pinout, AT24C08D-MAHM-E application, or AT24C08D-MAHM-E equivalent, key selection considerations include VCC voltage compatibility (1.7–3.6V), FM+ support at ≥2.5V, 16-byte page write capability, WP pin availability in MAHM-E package, and industrial-grade reliability (1M write cycles, 100-year data retention).

Technical Context

The AT24C08D-MAHM-E implements a true I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and bidirectional open-drain data transfer protocol. Its internal architecture includes a hardware address comparator (A2 input), high-voltage generation circuit for EEPROM programming, and POR-controlled reset behavior requiring ≥100 µs delay after stable VCC before first command.

Memory is organized into 64 pages of 16 bytes each, supporting byte-write, partial-page-write, random-read, and sequential-read operations. Write protection is implemented via dedicated WP pin tied to VCC (full-array lock) or GND (normal operation); A2 pin enables dual-device addressing on shared bus, with internal pull-down if floating.

Key Specifications

Pinout & Package

AT24C08D-MAHM-E is packaged in an 8-pad UDFN (2.0 mm × 1.6 mm, 0.5 mm pitch) with exposed pad. Pin 1 = NC, Pin 2 = NC, Pin 3 = A2, Pin 4 = GND, Pin 5 = SDA, Pin 6 = SCL, Pin 7 = WP, Pin 8 = VCC. Exposed pad may be connected to GND or left floating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C08C-SSHM-T, AT24C08D-MAHM-E offers faster 1 MHz FM+ operation and lower 1.7V minimum VCC but requires UDFN assembly; versus M95M01-RDW6TP/K, it provides native I²C simplicity and hardware write protection at the cost of lower density and interface exclusivity.

Availability

AT24C08D-MAHM-E is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and power-fail safe logging requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for AT24C08D-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 leading provider of microcontrollers, analog components, and memory solutions, with ISO 9001-certified manufacturing and global distribution infrastructure.

The AT24Cxx series delivers cost-optimized, low-voltage serial EEPROMs designed specifically for space-constrained, power-sensitive industrial and commercial systems requiring guaranteed data integrity over decades.

FAQ

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

AT24C08D-MAHM-E supports three I²C modes: 100 kHz standard mode (1.7–3.6V), 400 kHz fast mode (1.7–3.6V), and 1 MHz fast mode plus (FM+) - but FM+ requires VCC ≥2.5V. The 1 MHz capability enables faster parameter updates in time-critical applications such as real-time sensor recalibration. All timing parameters, including tLOW, tHIGH, and tAA, are fully specified in the DS20006022A datasheet for each mode.

Does AT24C08D-MAHM-E include hardware write protection?

Yes, AT24C08D-MAHM-E includes a dedicated Write-Protect (WP) pin (Pin 7). When WP is tied to VCC, all write operations to the entire memory array are inhibited; when tied to GND, normal writes are enabled. This hardware lock operates independently of software commands and remains active during power transitions, preventing accidental overwrites during brown-out events or firmware glitches - a key reliability feature confirmed in the device's DC characteristics table.

What package type is used for AT24C08D-MAHM-E?

AT24C08D-MAHM-E uses an 8-pad UDFN package (2.0 mm × 1.6 mm, 0.5 mm pitch) with exposed thermal pad. Pinout matches the standard 8-lead SOIC/TSSOP arrangement but in miniature form factor. The exposed pad may be connected to GND for improved thermal performance or left floating. This package is optimized for high-density PCB layouts in space-constrained industrial and IoT edge devices.

How many write cycles can AT24C08D-MAHM-E endure?

AT24C08D-MAHM-E is rated for 1,000,000 write cycles per memory location under industrial conditions (TA = 25°C, VCC within 1.7–3.6V). This endurance is validated per JEDEC standards and documented in Table 4-6 of the DS20006022A datasheet. Combined with 100-year data retention at 55°C, this makes AT24C08D-MAHM-E suitable for applications requiring frequent field updates, such as adaptive calibration in industrial sensors.

Is the A2 pin on AT24C08D-MAHM-E functional, and how should it be used?

Yes, the A2 pin (Pin 3) on AT24C08D-MAHM-E is fully functional and serves as the hardware address bit for I²C slave addressing. It allows up to two AT24C08D devices on the same bus by setting A2 = 0 or 1. If left unconnected, the internal strong pull-down biases it to logic '0'. Microchip recommends hard-wiring A2 to GND or VCC for deterministic operation - especially critical in noise-prone environments where capacitive coupling could cause unintended address shifts.