Microchip Technology AT24C04C-STUM-T

Overview

AT24C04C-STUM-T from Microchip Technology is a 4-Kbit I²C-compatible serial EEPROM organized as 512 × 8 bits, operating from 1.7V to 5.5V with industrial temperature range (−40°C to +85°C), 1 MHz Fast Mode Plus support at ≥2.5V, and hardware write-protection via WP pin - used for nonvolatile parameter storage in embedded controllers, power management units, and sensor calibration modules.

For engineers reviewing the AT24C04C-STUM-T datasheet, AT24C04C-STUM-T pinout, AT24C04C-STUM-T application, or AT24C04C-STUM-T equivalent, key selection considerations include I²C bus voltage compatibility (1.7–5.5V), page-write capability (16-byte pages), ultra-low standby current (≤6 μA), and hardware address inputs (A1/A2) enabling up to four devices on one bus.

Technical Context

The AT24C04C-STUM-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) speeds depending on VCC level. It uses an internal high-voltage generation circuit for EEPROM programming and includes a Power-on Reset (POR) circuit with 100 µs tPUP delay after stable VCC.

Memory is organized into 32 pages of 16 bytes each, supporting byte-write, page-write, random-read, and sequential-read operations. The A1 and A2 pins serve as hardwired device address inputs (A1 active on AT24C04C only), enabling up to four devices on a shared bus; WP pin provides full-array hardware write protection when tied to VCC.

Key Specifications

Pinout & Package

AT24C04C-STUM-T is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with gull-wing leads, RoHS-compliant, lead-free finish, and moisture sensitivity level (MSL) 3 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C04C-STUM-T, AT24C04D-STUM-T offers improved ESD robustness and tighter low-voltage timing, while M24C04-RMN6TP reduces address flexibility (no A1) but provides identical core functionality in a smaller TSSOP package - both require validation of WP pin behavior and page-write timing in target application.

Availability

AT24C04C-STUM-T is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter configuration storage, and embedded controller boot parameter retention requiring stable component supply across multi-year production cycles.

Supply support for AT24C04C-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 Inc. is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.

The AT24C04C belongs to Microchip's legacy I²C serial EEPROM product line, designed specifically for reliable, low-power, and cost-effective nonvolatile data storage in industrial, automotive, and consumer control systems.

FAQ

What is the maximum I²C clock frequency supported by the AT24C04C-STUM-T?

The AT24C04C-STUM-T supports 100 kHz Standard Mode across its full 1.7–5.5V range, 400 kHz Fast Mode also from 1.7–5.5V, and 1 MHz Fast Mode Plus only when VCC is 2.5V or higher. These modes are not simultaneously active - the host must configure clock speed according to applied VCC and noise conditions. The AT24C04C-STUM-T does not auto-negotiate speed; timing compliance must be verified per Table 4-3 in DS20006127B.

Does the AT24C04C-STUM-T require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C04C-STUM-T requires external pull-up resistors on both SDA and SCL lines because SDA is open-drain and SCL is a CMOS input. Microchip specifies maximum pull-up values of 10 kΩ for 100 kHz, 4 kΩ for 400 kHz, and 1.3 kΩ for 1 MHz operation, with recommended resistor tolerance ≤5% and placement near the bus master. Failure to use appropriate pull-ups will cause communication failures or excessive rise times violating I²C timing specs.

How does the Write-Protect (WP) pin function on the AT24C04C-STUM-T?

The WP pin on the AT24C04C-STUM-T disables all write operations (byte, page, and erase) when driven to VCC; it enables normal writes when tied to GND. If left floating, the internal weak pull-down asserts GND logic, permitting writes - but Microchip recommends hardwiring WP to avoid noise-induced false writes. The AT24C04C-STUM-T does not support partial-array protection; WP activation always protects the entire 4-Kbit memory space.

Can the AT24C04C-STUM-T operate reliably at 1.7V supply voltage?

Yes, the AT24C04C-STUM-T is fully specified for operation at 1.7V, including DC characteristics (e.g., ICC1 ≤1.0 mA during read), AC timing (100 kHz and 400 kHz modes), and functional correctness. However, 1 MHz Fast Mode Plus is disabled below 2.5V, and power-up slew rate must not exceed 0.1 V/µs. At 1.7V, VOL remains ≤0.2V with IOL = 0.15 mA, ensuring compatible logic levels with 1.8V microcontrollers.

What is the memory organization and addressing scheme of the AT24C04C-STUM-T?

The AT24C04C-STUM-T organizes its 4-Kbit memory as 512 words × 8 bits, grouped into 32 pages of 16 bytes each. Its 7-bit I²C slave address is formed as 1010xx0, where 'xx' corresponds to the logic states of A2 and A1 pins (hardwired to GND/VCC). This allows up to four AT24C04C-STUM-T devices on one bus. Internal address counter auto-increments during sequential reads, wrapping from 511 back to 0.