Microchip Technology AT25128-10PI-2.7

Overview

AT25128-10PI-2.7 from Microchip Technology (formerly Atmel) is a 128 Kbit SPI serial EEPROM organized as 16,384 × 8-bit memory array, operating from 2.7V to 5.5V, supporting 3 MHz clock rate and 64-byte page write. It features hardware write protection via WP pin, HOLD suspend functionality, and block write protection for 1/4, 1/2, or full memory array - deployed in industrial control modules requiring nonvolatile parameter storage with low-power operation.

For engineers reviewing the AT25128-10PI-2.7 datasheet, AT25128-10PI-2.7 pinout, AT25128-10PI-2.7 application, or AT25128-10PI-2.7 equivalent, key selection criteria include SPI Mode 0/3 compatibility, 5 ms typical self-timed write cycle, 100,000 write endurance, >200-year data retention, and 8-lead SOIC (JEDEC) package with verified pin mapping for CS/SO/WP/GND/VCC/HOLD/SCK/SI.

Technical Context

The AT25128-10PI-2.7 operates exclusively as an SPI slave device with separate SI (input) and SO (output) pins, requiring CS assertion and MSB-first 8-bit op-code framing. Its internal architecture includes a nonvolatile status register with BP0/BP1 bits controlling block protection and WPEN enabling/disabling hardware write protect functionality.

Timing compliance is defined across three VCC ranges: 4.5–5.5V, 2.7–5.5V, and 1.8–5.5V - with AC parameters including tWH/tWL ≥200 ns (2.7V), tSU/tH ≤50 ns, and tWC = 5–10 ms. The HOLD pin suspends ongoing serial transfers without resetting the sequence when asserted low during SCK low time.

Key Specifications

Pinout & Package

AT25128-10PI-2.7 uses an 8-lead JEDEC SOIC (8S1) package, 0.150" wide body, with gull-wing leads and standard 1.27 mm pitch. Pin 1 is marked by notch or beveled corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95128-DRMN3TP/K and BR24G128FJ-WE2, AT25128-10PI-2.7 offers unique HOLD pin support for seamless SPI pause/resume - critical in real-time systems with shared bus arbitration - while maintaining proven industrial reliability and direct pin compatibility with legacy Atmel-based designs.

Availability

AT25128-10PI-2.7 is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, automotive body electronics, and smart metering applications requiring stable component supply and long-term obsolescence management.

Supply support for AT25128-10PI-2.7 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 global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on embedded control and connectivity.

The AT25128-10PI-2.7 belongs to Microchip's legacy serial EEPROM product line, designed for robust, low-power nonvolatile storage in industrial and automotive environments where SPI interface simplicity and data integrity are paramount.

FAQ

What is the maximum clock frequency supported by the AT25128-10PI-2.7?

The AT25128-10PI-2.7 supports a maximum SCK clock frequency of 3 MHz across its specified 2.7V to 5.5V supply range. This value is validated per Table 4 AC Characteristics for VCC = 2.7–5.5V, with tWH/tWL ≥200 ns minimum pulse width. Exceeding this frequency may result in setup/hold violations and unreliable data transfer. The AT25128-10PI-2.7 does not support higher-speed variants like the AT25128A series.

Does the AT25128-10PI-2.7 have a HOLD pin, and how is it used?

Yes, the AT25128-10PI-2.7 includes a dedicated HOLD pin (Pin 6). When asserted low during SCK low time, it suspends ongoing SPI communication without resetting the internal address counter or command state. To resume, HOLD is returned high while SCK remains low. This feature is essential in multi-master systems or when MCU interrupts require temporary SPI pause. The AT25128-10PI-2.7 HOLD behavior is fully documented in Figure 10 and functional description section.

How many write cycles can the AT25128-10PI-2.7 endure, and what is its data retention period?

The AT25128-10PI-2.7 guarantees 100,000 write cycles per memory location at 5.0V and 25°C, as specified in Table 4. Its data retention exceeds 200 years under normal operating conditions (25°C, VCC within range). These values are measured and characterized - not estimated - and apply to both byte and page write operations. The AT25128-10PI-2.7 endurance rating is consistent across its entire 16,384-word array.

Is the AT25128-10PI-2.7 pin-compatible with newer Atmel/Microchip EEPROMs like the AT25128A?

No, the AT25128-10PI-2.7 is not pin-compatible with the AT25128A series. While both use 8-lead SOIC packages, the AT25128A introduces different pin functions (e.g., NC pins repurposed) and updated timing parameters. The AT25128-10PI-2.7 datasheet explicitly states "This device is not recommended for new designs. Please refer to AT25128A." Migration requires PCB layout revision and firmware validation due to functional and electrical differences in the AT25128A.

What protection mechanisms does the AT25128-10PI-2.7 provide against unintended writes?

The AT25128-10PI-2.7 implements three layered protections: (1) Write Enable Latch (WREN instruction required before any write), (2) Status register-controlled block protection (BP0/BP1 bits), and (3) Hardware write protect via WP pin when WPEN=1. All three must be satisfied for a write to succeed. The AT25128-10PI-2.7 WP pin function is disabled if WPEN=0, allowing flexible system-level protection schemes without hardware redesign.