Microchip Technology AT24C08D-STUM-T

Overview

AT24C08D-STUM-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), supporting 1 MHz Fast Mode Plus, and featuring hardware write protection via WP pin. It delivers ultra-low standby current (0.8 μA max) and 1,000,000 write endurance for embedded configuration storage in space-constrained industrial controllers.

For engineers reviewing the AT24C08D-STUM-T datasheet, AT24C08D-STUM-T pinout, AT24C08D-STUM-T application, or AT24C08D-STUM-T equivalent, key selection factors include VCC voltage compatibility (1.7–3.6 V), I²C bus speed support (100/400 kHz and 1 MHz FM+), page-write capability (16-byte pages), write-protection logic (WP pin active-high), and package-specific pin mapping (UDFN-8).

Technical Context

The AT24C08D-STUM-T operates as a slave device on a two-wire I²C bus, using SCL for clock synchronization and open-drain SDA for bidirectional data transfer with Schmitt-triggered, noise-filtered inputs. Its internal architecture includes a 64-page × 16-byte memory array, address register with A2 hardware-selectable addressing, and high-voltage generation circuitry enabling byte/page writes without external programming voltage.

Write operations are self-timed with ≤5 ms maximum cycle time and support both random and sequential read modes. The device incorporates Power-on Reset (POR) with 100 µs tPUP delay, automatic A2 pull-down when floating, and hardware write protection that disables all writes when WP = VCC - critical for firmware parameter integrity in unattended systems.

Key Specifications

Pinout & Package

AT24C08D-STUM-T is packaged in an 8-pad UDFN (2.0 mm × 1.6 mm, 0.5 mm pitch) with exposed pad optionally connected to GND. Pin functions are validated per Microchip DS20006022A-page 4 and page 5.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C08D-STUM-T, AT24C08C-SSHM-T offers identical functionality in a larger, more manufacturable SOIC package, while M95M01-RDW6TP provides higher density and faster interface but requires SPI bus redesign and lacks hardware write protection - making it unsuitable for direct substitution in I²C-critical or safety-sensitive applications.

Availability

AT24C08D-STUM-T is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter firmware storage, and automotive body control modules requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for AT24C08D-STUM-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 distribution infrastructure.

The AT24C08D belongs to Microchip's AT24Cxx family of I²C serial EEPROMs, designed specifically for low-voltage, low-power embedded systems requiring robust nonvolatile storage in space-constrained industrial and automotive applications.

FAQ

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

The AT24C08D-STUM-T supports three I²C speed modes: 100 kHz (Standard Mode), 400 kHz (Fast Mode), and 1 MHz (Fast Mode Plus). Fast Mode Plus operation requires VCC ≥ 2.5 V. All modes are fully compliant with I²C bus specifications and include integrated Schmitt triggers and noise filters on SCL and SDA pins to ensure reliable communication in electrically noisy environments. The AT24C08D-STUM-T maintains timing compliance across its full 1.7–3.6 V operating range.

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

Yes, the AT24C08D-STUM-T requires external pull-up resistors on both SDA and SCL lines because SDA is open-drain and SCL is a CMOS input. Recommended values are 1.3 kΩ for 1 MHz operation, 4 kΩ for 400 kHz, and 10 kΩ for 100 kHz - selected based on bus capacitance and rise-time requirements. The AT24C08D-STUM-T does not include internal pull-ups; omission will result in bus failure. Pull-up voltage must match VCC (1.7–3.6 V).

How does the Write-Protect (WP) pin function on the AT24C08D-STUM-T?

The WP pin on the AT24C08D-STUM-T is an active-high hardware lock: when tied to VCC, it disables all write operations to the entire memory array; when tied to GND, normal read/write access is enabled. If left floating, the pin is internally pulled down to GND, enabling writes - but Microchip recommends hard-wiring WP to a known state to prevent noise-induced corruption. This feature ensures firmware and calibration data integrity in unattended systems. The AT24C08D-STUM-T implements this logic without software overhead.

What is the memory organization and page structure of the AT24C08D-STUM-T?

The AT24C08D-STUM-T contains 8,192 bits organized as 1,024 words of 8 bits each, internally segmented into 64 pages of 16 bytes. This page structure enables efficient 16-byte burst writes - partial page writes are allowed, and each write cycle completes in ≤5 ms. The memory map supports both random and sequential read modes, with address auto-increment during sequential reads. This architecture optimizes data logging and configuration storage in resource-constrained microcontrollers. The AT24C08D-STUM-T uses standard I²C device addressing with A2 pin selectable for multi-device bus configurations.

Is the AT24C08D-STUM-T compatible with 1.8 V microcontrollers?

Yes, the AT24C08D-STUM-T is fully compatible with 1.8 V microcontrollers: it operates from 1.7 V to 3.6 V, supports I²C Standard and Fast Modes at 1.7–3.6 V, and has input thresholds defined as VIL ≤ 0.3×VCC and VIH ≥ 0.7×VCC - ensuring reliable logic-level recognition at 1.8 V. Its 0.8 μA max standby current and 1 mA max active current minimize loading on 1.8 V power rails. No level-shifting circuitry is required when interfacing the AT24C08D-STUM-T with 1.8 V I²C masters.