Microchip Technology AT24C32D-XPD-T

Overview

AT24C32D-XPD-T from Microchip Technology is a 32-Kbit I²C-compatible automotive-grade serial EEPROM organized as 4,096 × 8 bits, operating from 1.7V to 5.5V (Grade 3) or 2.5V to 5.5V (Grade 1), with AEC-Q100 qualification, 1,000,000 write endurance, and 100-year data retention - used for calibration storage, configuration backup, and fault log retention in engine control units and ADAS modules.

For engineers reviewing the AT24C32D-XPD-T datasheet, AT24C32D-XPD-T pinout, AT24C32D-XPD-T application, or AT24C32D-XPD-T equivalent, key selection considerations include Grade 3 temperature range (−40°C to +85°C), 5-lead SOT23 package compatibility, hardware write-protection via WP pin, and support for 400 kHz Fast-mode I²C timing with Schmitt-triggered noise-immune inputs.

Technical Context

The AT24C32D-XPD-T implements a two-wire I²C slave interface with fixed device type identifier '1010', three hardware address inputs (A0–A2), and dedicated Write-Protect (WP) control - enabling up to eight devices on one bus while supporting both byte and 32-byte page writes. Its internal high-voltage generation circuit enables EEPROM cell programming without external VPP.

It features integrated power-on reset (POR) with 100 µs tPUP delay, automatic standby mode entry after Stop conditions or write completion, and software reset capability via SCL clocking - all designed for robust operation in automotive power domains subject to brownouts and transient noise.

Key Specifications

Pinout & Package

AT24C32D-XPD-T uses the 5-lead SOT23 package (3.0 mm × 1.7 mm × 1.3 mm height), optimized for space-constrained automotive modules. Pin 1 is SCL; Pin 2 is GND; Pin 3 is SDA; Pin 4 is VCC; Pin 5 is WP. No A0/A1/A2 pins are present - device address is fixed at 0x50 (1010000b) per datasheet Table 6-1 footnote for SOT23 variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C32D-XPD-T, M24C32-WMN6TP requires mechanical redesign due to SO8 packaging, while CAT24C32WI-GT3 offers true pin-compatible redundancy with identical thermal and electrical performance - making it the preferred alternative for supply chain resilience without layout change.

Availability

AT24C32D-XPD-T is available at Aetrix Electronics and suitable for automotive body electronics, ADAS sensor modules, and engine management systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant traceability.

Supply support for AT24C32D-XPD-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/TS 16949-certified automotive manufacturing and global distribution.

The AT24C32D-XPD-T belongs to Microchip's AEC-Q100-qualified serial EEPROM product line, engineered specifically for automotive subsystems needing reliable, low-power, and noise-immune nonvolatile storage in constrained spaces.

FAQ

What is the package type and lead count of the AT24C32D-XPD-T?

The AT24C32D-XPD-T uses a 5-lead SOT23 package (3.0 mm × 1.7 mm), with pins assigned as SCL (1), GND (2), SDA (3), VCC (4), and WP (5). Unlike SOIC or TSSOP variants, this version omits A0/A1/A2 pins and fixes the I²C address to 0x50 - confirmed in Microchip DS20006271A, page 4 and Table 2-1 footnote 2.

Does the AT24C32D-XPD-T support both Standard-mode and Fast-mode I²C communication?

Yes, the AT24C32D-XPD-T supports 100 kHz Standard-mode and 400 kHz Fast-mode I²C operation per DS20006271A Section 4.4. Its AC timing parameters - including tLOW (1,200 ns max), tHIGH (600 ns max), and tR/tF (300 ns max) - are fully specified for Fast-mode, and Schmitt-triggered inputs ensure robustness at both speeds in electrically noisy automotive environments.

What is the maximum write endurance and data retention specification for the AT24C32D-XPD-T?

The AT24C32D-XPD-T guarantees 1,000,000 write cycles and 100 years of data retention at 55°C (DS20006271A Table 4-6). These values are validated through accelerated stress testing per AEC-Q100 requirements and apply across its full Grade 3 temperature range (−40°C to +85°C), ensuring long-term reliability in automotive applications.

How does the Write-Protect (WP) pin function on the AT24C32D-XPD-T?

On the AT24C32D-XPD-T, the WP pin (Pin 5) provides hardware-level write protection: when tied to VCC, all memory writes are inhibited; when tied to GND, normal write operations proceed. If left floating, WP is internally pulled down to GND - but Microchip recommends hardwiring it to avoid noise-induced glitches, as noted in DS20006271A Section 2.5.

Is the AT24C32D-XPD-T AEC-Q100 qualified, and what grade does it meet?

Yes, the AT24C32D-XPD-T is AEC-Q100 qualified per Rev G and meets Grade 3 specifications: operating temperature range of −40°C to +85°C and supply voltage range of 1.7V to 5.5V (DS20006271A Section 1 and Table 4-1). This qualification covers stress tests including HTOL, TC, and ESD - confirming suitability for non-safety-critical automotive electronics.