Microchip Technology AT24C08C-MAHM-T

Overview

AT24C08C-MAHM-T from Microchip Technology is an 8-Kbit (1,024 × 8) I²C-compatible serial EEPROM in an 8-pad UDFN package, operating from 1.7V to 5.5V with industrial temperature range (−40°C to +85°C), 1 MHz Fast Mode Plus support, and hardware write-protection via WP pin - used for nonvolatile configuration storage in embedded controllers and sensor modules.

For engineers reviewing the AT24C08C-MAHM-T datasheet, AT24C08C-MAHM-T pinout, AT24C08C-MAHM-T application, or AT24C08C-MAHM-T equivalent, key selection criteria include I²C bus voltage compatibility (1.7–5.5V), page-write timing (≤5 ms), standby current (≤6 μA), and UDFN-8 footprint constraints for space-constrained PCBs.

Technical Context

The AT24C08C-MAHM-T implements a two-wire I²C interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) clock rates depending on VCC level. Its memory is organized as 64 pages of 16 bytes each, enabling partial-page writes and sequential reads without address wraparound.

It features internal pull-downs on A2 and WP pins (floating-safe operation), a dedicated Write-Protect pin that disables all writes when tied to VCC, and Power-on Reset circuitry requiring ≥100 µs delay after stable VCC before first command. The device uses no A1 pin - confirmed for AT24C08C family - simplifying address decoding to A2-only hardware addressing (up to 2 devices per bus).

Key Specifications

Pinout & Package

AT24C08C-MAHM-T is housed in an 8-pad UDFN (Ultra Thin Dual Flat No-lead) package, 2.0 mm × 1.6 mm × 0.55 mm, with wettable flank leads for automated optical inspection (AOI) and enhanced solder joint reliability. 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 AT24C08D-MAHM-T, the AT24C08C-MAHM-T provides identical functionality at lower cost and broader qualification history, while M24C08-RMN6TP trades package flexibility and noise resilience for footprint compatibility - making AT24C08C-MAHM-T the optimal balance of size, reliability, and design maturity for new industrial designs.

Availability

AT24C08C-MAHM-T is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter configuration storage, and IoT edge device identity management requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.

Supply support for AT24C08C-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 Inc. is a leading provider of microcontrollers, analog components, and nonvolatile memory solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.

The AT24C08C-MAHM-T belongs to Microchip's serial EEPROM product line, engineered specifically for low-voltage, low-power, and high-reliability embedded applications where deterministic I²C communication and long-term data integrity are essential.

FAQ

What is the maximum I²C clock frequency supported by the AT24C08C-MAHM-T?

The AT24C08C-MAHM-T supports up to 1 MHz Fast Mode Plus operation when VCC is 2.5V or higher. At 1.7V–2.5V, it operates up to 400 kHz Fast Mode. This dual-speed capability allows designers to optimize bus throughput based on system voltage rails without changing firmware or hardware. The AT24C08C-MAHM-T maintains full timing compliance across both modes per DS20006127B.

Does the AT24C08C-MAHM-T require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C08C-MAHM-T requires external pull-up resistors on both SDA and SCL lines because both pins are open-drain. Recommended values are ≤1.3 kΩ for 1 MHz operation, ≤4 kΩ for 400 kHz, and ≤10 kΩ for 100 kHz - matched to bus capacitance and speed requirements. The AT24C08C-MAHM-T does not include internal pull-ups, and omission will result in bus failure.

How many devices can share the same I²C bus with the AT24C08C-MAHM-T?

Up to two AT24C08C-MAHM-T devices can share a single I²C bus, using the A2 pin to select between addresses 0x50 and 0x51. Unlike the AT24C04C, the AT24C08C omits the A1 pin - confirmed in the datasheet pin table and block diagram - so only one hardware address bit is available. This limitation is inherent to the AT24C08C-MAHM-T silicon design.

What happens to the WP pin if it is left unconnected on the AT24C08C-MAHM-T?

If the WP pin is left unconnected on the AT24C08C-MAHM-T, it is internally pulled down to GND, enabling normal write operations. However, Microchip recommends tying WP to a defined logic level (GND for write-enable, VCC for full-array protection) due to potential capacitive coupling in noisy environments. This behavior is explicitly documented in the DS20006127B Pin Descriptions section for AT24C08C-MAHM-T.

Is the AT24C08C-MAHM-T compatible with 1.8V I²C systems?

Yes, the AT24C08C-MAHM-T is fully compatible with 1.8V I²C systems: it operates down to 1.7V VCC, supports Standard Mode (100 kHz) across the full 1.7–5.5V range, and meets I²C voltage threshold specifications (VIL ≤ 0.3×VCC, VIH ≥ 0.7×VCC). Its Schmitt-triggered inputs ensure robust noise immunity at 1.8V - a key advantage over non-filtered EEPROMs in mixed-voltage designs.