Microchip Technology AT24C32D-SSHM-T

Overview

AT24C32D-SSHM-T from Microchip Technology is a 32-Kbit I²C-compatible serial EEPROM organized as 4,096 × 8 bits, operating from 1.7V to 5.5V across -40°C to +85°C, with hardware write protection (WP), 32-byte page write capability, and 1 MHz Fast Mode Plus support at 2.5–5.5V - deployed in industrial control panels for nonvolatile parameter storage.

For engineers reviewing the AT24C32D-SSHM-T datasheet, AT24C32D-SSHM-T pinout, AT24C32D-SSHM-T application, or AT24C32D-SSHM-T equivalent, key selection criteria include I²C bus voltage compatibility (1.7–5.5V), WP pin functionality for hardware memory lock, 5 ms max write cycle time, and SOIC-8 package mechanical fit in space-constrained embedded designs.

Technical Context

The AT24C32D-SSHM-T implements a standard I²C slave interface with bidirectional SDA and unidirectional SCL, supporting Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) timing at defined VCC ranges. Its internal address decoder accepts A0–A2 inputs to enable up to eight devices on one bus.

It features Schmitt-triggered, noise-filtered inputs, open-drain SDA with external pull-up requirement, and an internal power-on reset (POR) circuit with 1.5 V threshold and 100 µs tPUP delay. Write protection is implemented via dedicated WP pin tied to VCC for full-array lockout.

Key Specifications

Pinout & Package

AT24C32D-SSHM-T 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 DS20006047A-page 5 Table 2-1 and page 4 top-view diagram.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C32D-SSHM-T, AT24C32AN-SSHM-T adds automotive qualification at higher cost and temperature range, while M24C32-WMN6TP trades minor timing margin improvements for stronger ESD hardening - neither is pin-compatible without layout verification due to differing internal pull-down strengths and WP behavior under floating conditions.

Availability

AT24C32D-SSHM-T is available at Aetrix Electronics and suitable for industrial control panels, smart energy meters, medical diagnostics equipment, and automotive body control modules requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.

Supply support for AT24C32D-SSHM-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified manufacturing and global distribution.

The AT24C32D belongs to Microchip's serial EEPROM product line, designed specifically for low-voltage, low-power, and high-reliability nonvolatile data storage in industrial, medical, and consumer embedded systems.

FAQ

What is the maximum I²C clock frequency supported by the AT24C32D-SSHM-T?

The AT24C32D-SSHM-T supports 100 kHz Standard mode (1.7–5.5V), 400 kHz Fast mode (1.7–5.5V), and 1 MHz Fast Mode Plus (2.5–5.5V). At 1.7–2.4V, only Standard and Fast modes are guaranteed; FM+ requires ≥2.5V VCC to meet timing specifications per DS20006047A-page 10 Table 4-3.

Does the AT24C32D-SSHM-T require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C32D-SSHM-T requires external pull-up resistors on both SDA and SCL. SDA is open-drain and must use ≤10 kΩ; SCL may be driven or pulled up similarly. Recommended values are 4 kΩ for 400 kHz and 1.3 kΩ for 1 MHz operation per DS20006047A-page 10.

How does the WP pin function on the AT24C32D-SSHM-T?

When WP is tied to VCC, the AT24C32D-SSHM-T inhibits all write operations to its entire memory array. When WP is at GND, normal read/write is enabled. If left floating, WP is internally pulled down to GND, but Microchip recommends hard-wiring it to avoid noise-induced false writes.

What is the memory organization of the AT24C32D-SSHM-T?

The AT24C32D-SSHM-T organizes its 32,768 bits as 4,096 words × 8 bits, grouped into 128 pages of 32 bytes each. This structure enables efficient 32-byte page writes and supports random or sequential reads across the full address space (0x0000–0x0FFF).

Is the AT24C32D-SSHM-T compatible with 1.8V I²C systems?

Yes, the AT24C32D-SSHM-T operates down to 1.7V and supports 100 kHz and 400 kHz I²C modes across 1.7–5.5V. At 1.8V, it meets all DC and AC timing specs including VOL ≤0.2V at 0.15 mA load, making it fully interoperable with 1.8V microcontrollers without level translation.