Microchip Technology AT24C08C-XPD-T

Overview

AT24C08C-XPD-T from Microchip Technology (formerly Atmel) is an automotive-grade 8K-bit (1,024 × 8) I²C-compatible serial EEPROM with 16-byte page write capability, 1.7V–5.5V operation (Grade 3), and -40°C to +85°C temperature range. It features hardware write protection via the WP pin, Schmitt-trigger inputs for noise immunity, and 1,000,000 write cycles endurance - deployed in vehicle body control modules for storing calibration data and configuration parameters.

For engineers reviewing the AT24C08C-XPD-T datasheet, AT24C08C-XPD-T pinout, AT24C08C-XPD-T application, or AT24C08C-XPD-T equivalent, key selection criteria include its TSSOP-8 package, A2-only device addressing (A0/A1 NC), 400 kHz I²C speed at 2.5V, self-timed 5 ms max write cycle, and automotive Grade 3 qualification per AEC-Q100.

Technical Context

The AT24C08C-XPD-T implements a standard two-wire I²C interface with open-drain SDA/SCL pins, supporting byte and 16-byte page writes. Its internal memory is organized as 64 pages of 16 bytes each, requiring a 10-bit word address for random access. The device uses a high-voltage pump and timing circuitry for EEPROM programming, with automatic address incrementing during sequential reads.

It operates across dual voltage ranges: 1.7–5.5V for Grade 3 (this variant), with DC characteristics including 0.1–6.0 µA standby current and 0.4–3.0 mA active supply current. Write protection is controlled solely by the WP pin state - tied to VCC for full-array lockout, GND for normal R/W operation.

Key Specifications

Pinout & Package

AT24C08C-XPD-T is housed in an 8-lead TSSOP (8X) package: 4.4 mm body width, 0.65 mm lead pitch, gull-wing leads, RoHS-compliant NiPdAu finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C08C-XPD-T, AT24C08D-XPD-T delivers higher temperature resilience at the cost of reduced low-voltage operation, while BR24G08NUX-10 provides faster throughput and wider VCC range but no automotive qualification - making AT24C08C-XPD-T the optimal choice for cost-sensitive, Grade 3-compliant body electronics.

Availability

AT24C08C-XPD-T is available at Aetrix Electronics and suitable for automotive body control, infotainment, ADAS camera calibration, and electronic parking brake systems requiring stable component supply across multi-year production cycles.

Supply support for AT24C08C-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 acquired Atmel in 2016 and maintains full product continuity, manufacturing, and technical support for the AT24CxxC EEPROM family.

The AT24C08C-XPD-T belongs to Microchip's automotive-qualified serial EEPROM product line, engineered specifically for reliable, low-power nonvolatile data storage in harsh vehicular environments with stringent AEC-Q100 compliance requirements.

FAQ

What is the maximum I²C clock frequency supported by the AT24C08C-XPD-T?

The AT24C08C-XPD-T supports up to 400 kHz I²C clock frequency at 2.5V supply. At lower voltages (e.g., 1.7V), the maximum recommended frequency is 100 kHz per AC characteristics in the datasheet. This ensures reliable setup/hold timing margins across Grade 3 operating conditions. The device does not support Fast-mode Plus (1 MHz) or High-speed mode.

Is the AT24C08C-XPD-T pin-compatible with the AT24C08D-XPD-T?

Yes, the AT24C08C-XPD-T and AT24C08D-XPD-T share identical TSSOP-8 pinout, terminal functions, and mechanical footprint. Both use A2 for device addressing and leave A0/A1 as no-connects. However, they differ in temperature grade (Grade 3 vs. Grade 1) and voltage range (1.7–5.5V vs. 2.5–5.5V), so electrical compatibility must be verified per application.

How does the Write Protect (WP) pin function on the AT24C08C-XPD-T?

On the AT24C08C-XPD-T, the WP pin enables hardware-level write protection: when pulled to VCC, it disables all write operations (byte, page, and write-enable commands) across the entire memory array. When grounded, full read/write functionality is restored. This behavior is implemented internally - no software command is required to activate or deactivate protection.

What memory organization does the AT24C08C-XPD-T use, and how does it affect addressing?

The AT24C08C-XPD-T organizes its 8K-bit memory as 1,024 words of 8 bits each, grouped into 64 pages of 16 bytes. This requires a 10-bit word address for random access. During page writes, the lower 4 address bits auto-increment, wrapping within the 16-byte boundary - enabling efficient block updates without host-side address management.

Does the AT24C08C-XPD-T require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C08C-XPD-T requires external pull-up resistors on both SDA and SCL lines because these pins are open-drain. Recommended values are 1.3 kΩ for 2.5V/5.5V operation and 10 kΩ for 1.7V operation, per AC characteristics table. Proper pull-up strength ensures valid logic levels and meets rise-time specifications (<300 ns) across temperature and capacitive bus loads.