Microchip Technology 24AA02H-I/MS

Overview

24AA02H-I/MS from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory with hardware write-protect for the upper half-array (80h–FFh), 1.7V to 5.5V operation, and industrial temperature range (−40°C to +85°C). It features Schmitt-trigger inputs, slope-controlled outputs, 8-byte page write buffer, and 1 μA standby current - deployed in embedded system configuration storage, sensor calibration data retention, and secure device identity storage.

For engineers reviewing the 24AA02H-I/MS datasheet, 24AA02H-I/MS pinout, 24AA02H-I/MS application, or 24AA02H-I/MS equivalent, this page delivers verified electrical specifications, MSOP-8 package layout, I²C timing compliance (up to 400 kHz at V_CC ≥ 2.5V), half-array write-protection behavior, and validated alternative parts for design continuity and supply resilience.

Technical Context

The 24AA02H-I/MS implements a two-wire I²C interface with fixed 7-bit client address (1010xxxR/W) and no internal connection to A0–A2 pins - enabling single-device bus placement without address conflicts. Its memory controller supports byte and page write modes with self-timed erase/write cycles (max 5 ms), automatic address pointer incrementing, and ACK polling for cycle completion detection.

Hardware write-protection is implemented via the WP pin: tied to V_SS, full array access is enabled; tied to V_CC, addresses 80h–FFh are write-inhibited while reads remain unrestricted. All I/O pins feature Schmitt-trigger inputs and noise-filtering circuitry (50 ns spike suppression), ensuring robust operation on electrically noisy PCBs.

Key Specifications

Pinout & Package

24AA02H-I/MS is supplied in an 8-lead MSOP (Micro Small Outline Package) with 0.65 mm pitch, 3.0 mm × 3.0 mm body, and exposed pad (optional V_SS connection per Microchip Drawing C04-057-MS Rev E).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC02B-I/MS, the 24AA02H-I/MS enables lower-voltage operation critical for modern ultra-low-power systems; compared with AT24C02D-MAHM-T, it offers tighter industrial temp grade and lower standby current but lacks AEC-Q100 certification - guiding selection based on voltage, temperature, and qualification needs.

Availability

24AA02H-I/MS is available at Aetrix Electronics and suitable for embedded configuration storage, sensor calibration data retention, and secure device identity applications requiring stable component supply, long-term data integrity, and industrial temperature performance.

Supply support for 24AA02H-I/MS 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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24AA02H belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power nonvolatile data storage in space-constrained embedded systems where I²C simplicity and hardware write protection are essential.

FAQ

What is the minimum operating voltage for the 24AA02H-I/MS?

The 24AA02H-I/MS operates down to 1.7V, making it compatible with 1.8V logic families without level shifters. This is confirmed in the Device Selection Table and Electrical Characteristics section of DS20002105B, where V_CC min is specified as 1.7V for industrial temperature range. The 24LC02BH variant requires 2.5V minimum, distinguishing the 24AA02H-I/MS for ultra-low-voltage designs.

How does the write-protect function work on the 24AA02H-I/MS?

The WP pin on the 24AA02H-I/MS enables hardware-based write protection: when tied to V_CC, addresses 80h–FFh (upper 128 bytes) become write-inhibited while reads remain fully functional; when tied to V_SS, the entire 256-byte array is writable. This behavior is documented in Section 2.4 and Figure 6-3 of DS20002105B and applies identically to the 24AA02H-I/MS MSOP package.

Is the 24AA02H-I/MS AEC-Q100 qualified?

No, the 24AA02H-I/MS is not AEC-Q100 qualified. While the broader 24XX02H family includes automotive-qualified variants (e.g., 24AA02E48), the 24AA02H-I/MS is specified for industrial temperature range (−40°C to +85°C) only. AEC-Q100 qualification is explicitly stated for other part numbers like 24AA02E48 in Microchip's official documentation and packaging markings.

What is the maximum I²C clock frequency supported by the 24AA02H-I/MS?

The 24AA02H-I/MS supports up to 400 kHz I²C clock frequency when V_CC is 2.5V or higher, and 100 kHz when V_CC is between 1.7V and 2.5V. This dual-speed capability is defined in Table 1-2 (AC Characteristics) of DS20002105B and applies directly to the 24AA02H-I/MS in MSOP package.

Does the 24AA02H-I/MS require external pull-up resistors on SDA and SCL lines?

Yes, the 24AA02H-I/MS requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Typical values are 2 kΩ for 400 kHz operation and 10 kΩ for 100 kHz, as specified in Section 2.2 (SDA description) and Figure 4-1 of DS20002105B. These resistors ensure proper bus voltage levels and timing compliance.