Microchip Technology AT24C01D-PUM

Overview

AT24C01D-PUM from Microchip Technology is a 1-Kbit I²C-compatible serial EEPROM organized as 128 × 8 bits, operating from 1.7V to 3.6V with industrial temperature range (−40°C to +85°C), 100/400 kHz I²C standard/fast mode support, and hardware write-protection via WP pin - used for nonvolatile configuration storage in microcontroller-based sensor nodes and power management modules.

For engineers reviewing the AT24C01D-PUM datasheet, AT24C01D-PUM pinout, AT24C01D-PUM application, or AT24C01D-PUM equivalent, key selection considerations include its 8-pin SOIC package, 5 ms max write cycle time, 1 µA standby current, Schmitt-triggered noise-immune inputs, and compatibility with multi-device I²C bus topologies using A0–A2 address pins.

Technical Context

The AT24C01D-PUM functions as an I²C slave device with fixed 7-bit device address prefix 1010b and three programmable hardware address bits (A0–A2), enabling up to eight devices on one bus. It implements open-drain SDA/SCL interfaces with integrated Schmitt triggers and spike filtering for robust noise immunity in electrically noisy environments.

Its memory architecture supports byte and 8-byte page writes, random/sequential reads, and hardware write protection via the WP pin. Internal high-voltage generation enables EEPROM cell programming without external charge pumps, and Power-on Reset (POR) ensures reliable initialization at VCC ≥ 1.5 V with tPUP ≥ 100 µs delay before first command acceptance.

Key Specifications

Pinout & Package

AT24C01D-PUM is supplied in an 8-lead SOIC package (3.9 mm × 4.9 mm body, 1.27 mm pitch). Pin functions are validated per Microchip DS20006100A-page 5 Table 2-1 and confirmed for this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C01D-PUM, AT24C01C-SSHM-T offers broader voltage tolerance but lacks 1 MHz Fast Mode Plus, while M24C01-RMN6TP provides identical functionality in thermally superior TSSOP packaging - both require validation of WP pin behavior and A0–A2 address decoding in existing firmware.

Availability

AT24C01D-PUM is available at Aetrix Electronics and suitable for smart sensor nodes, industrial PLC modules, medical wearables, and automotive body control units requiring stable component supply, long-term data retention, and low-power nonvolatile storage.

Supply support for AT24C01D-PUM 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 memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The AT24C01D-PUM belongs to Microchip's AT24Cxx family of I²C serial EEPROMs, designed specifically for low-voltage, low-power embedded systems requiring reliable, byte-addressable nonvolatile storage in space-constrained applications.

FAQ

What is the maximum I²C clock frequency supported by the AT24C01D-PUM?

The AT24C01D-PUM supports Standard Mode (100 kHz), Fast Mode (400 kHz), and Fast Mode Plus (1 MHz) - but FM+ requires VCC ≥ 2.5 V. At 1.7–2.4 V, only Standard and Fast modes are guaranteed. This allows designers to scale communication speed based on supply voltage and noise environment without changing hardware.

Does the AT24C01D-PUM require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C01D-PUM requires external pull-up resistors on both SDA and SCL because these pins are open-drain. Microchip specifies maximum values of 10 kΩ for SDA and recommends ≤10 kΩ for SCL. Typical values range from 2.2 kΩ to 4.7 kΩ depending on bus capacitance and desired rise time - essential for reliable I²C signaling in the AT24C01D-PUM.

How does the Write-Protect (WP) pin function on the AT24C01D-PUM?

When WP is driven high (to VCC), the AT24C01D-PUM disables all write operations to its entire memory array. When WP is at GND or left floating (internally pulled down), writes are enabled. Microchip recommends tying WP to a known state - not leaving it floating - to prevent unintended writes due to capacitive coupling, a critical reliability consideration in the AT24C01D-PUM.

What is the endurance rating and data retention period for the AT24C01D-PUM?

The AT24C01D-PUM is rated for 1,000,000 write cycles and 100 years of data retention at 55°C. These specifications are verified through qualification testing and apply across the full industrial temperature range (−40°C to +85°C), making the AT24C01D-PUM suitable for mission-critical applications where long-term data integrity is mandatory.

Is the AT24C01D-PUM pin-compatible with other AT24Cxx series EEPROMs in SOIC-8 packages?

Yes, the AT24C01D-PUM shares identical SOIC-8 pinout and I²C interface behavior with AT24C02D-PUM, AT24C04D-PUM, and higher-density variants - differing only in memory size and internal addressing. Firmware written for AT24C01D-PUM can often run unchanged on larger variants when using byte-write access, simplifying design reuse across product families containing AT24C01D-PUM.