Microchip Technology AT25320A-10PI-1.8

Overview

AT25320A-10PI-1.8 from Microchip Technology (formerly Atmel) is a 32-Kbit SPI serial EEPROM organized as 4096 × 8-bit memory, supporting 1.8V to 5.5V operation, 20 MHz clock rate at 5V, 32-byte page write, and hardware/software write protection via WP pin and status register. It serves in industrial control systems for parameter storage and firmware configuration.

For engineers reviewing the AT25320A-10PI-1.8 datasheet, AT25320A-10PI-1.8 pinout, AT25320A-10PI-1.8 application, or AT25320A-10PI-1.8 equivalent, key selection criteria include low-voltage compatibility (1.8V min), automotive-grade temperature range (−40°C to +85°C), block write protection granularity, self-timed 5 ms max write cycle, and 8-lead PDIP package mechanical fit.

Technical Context

The AT25320A-10PI-1.8 operates as an SPI slave device with fixed 3-wire interface (CS, SCK, SI/SO), supports SPI modes 0 and 3, and uses MSB-first data framing. Its internal architecture includes a nonvolatile status register with BP0/BP1 bits enabling 1/4, 1/2, or full-array write protection and WPEN bit controlling hardware write protect functionality.

It features dual supply voltage support (1.8–5.5V), with DC characteristics validated across −40°C to +85°C, and AC timing compliant with tWH/tWL ≥20 ns (1.8V), ≥40 ns (2.7V), ≥80 ns (4.5–5.5V). The HOLD pin suspends ongoing serial transfers without resetting sequence state, and all writes require prior WREN instruction.

Key Specifications

Pinout & Package

AT25320A-10PI-1.8 is housed in an 8-lead PDIP (8P3) package per JEDEC MS-001, 0.300" body width, with 0.100" lead pitch. Pin 1 is marked by notch or dot; leads are gull-wing shaped with standard DIP footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95320-DRMN3TP/K and BR24G32FJ-3GE2, the AT25320A-10PI-1.8 uniquely combines PDIP packaging, HOLD pin support, and full 20 MHz operation at 5V-making it optimal for legacy industrial controllers requiring field-serviceable through-hole components and robust multi-master SPI coordination.

Availability

AT25320A-10PI-1.8 is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, automotive body electronics, and smart metering applications requiring stable component supply, long-term obsolescence management, and RoHS-compliant through-hole solutions.

Supply support for AT25320A-10PI-1.8 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 products, with a focus on embedded control and connectivity solutions.

The AT25320A-10PI-1.8 belongs to Microchip's AT25xxx family of SPI serial EEPROMs, designed specifically for reliable, low-power nonvolatile data storage in industrial, automotive, and consumer systems where robustness and voltage flexibility are critical.

FAQ

What is the memory organization of the AT25320A-10PI-1.8?

The AT25320A-10PI-1.8 contains 32,768 bits of serial EEPROM memory organized as 4096 words × 8 bits. This structure supports byte-level random reads and 32-byte page writes, enabling efficient access patterns for configuration data and firmware patches. The memory map is linear with no internal bank switching required.

Does the AT25320A-10PI-1.8 support both 1.8V and 5V operation simultaneously?

No, the AT25320A-10PI-1.8 operates across a single supply voltage range of 1.8V to 5.5V - it does not require dual supplies. All I/O pins are fully 5V-tolerant when VCC is 1.8V, eliminating need for external level shifters when interfacing with mixed-voltage systems. Logic thresholds scale with VCC per VIH/VIL specifications.

How does the WRITE PROTECT (WP) pin function on the AT25320A-10PI-1.8?

The WP pin on the AT25320A-10PI-1.8 disables writes to the status register and protected memory blocks only when the WPEN bit is set to "1" in the status register. When WP is low and WPEN=1, all status register writes and writes to BP-protected regions are blocked. If WPEN=0, the WP pin has no effect, allowing full write access regardless of WP state.

What is the purpose of the HOLD pin on the AT25320A-10PI-1.8?

The HOLD pin on the AT25320A-10PI-1.8 pauses ongoing SPI communication without resetting the internal address counter or command state. When asserted (low) while SCK is low, it places SO in high-impedance and ignores SI inputs until de-asserted. This enables host MCU interrupt servicing or bus arbitration without losing transaction context - a key feature for real-time systems.

Can the AT25320A-10PI-1.8 be used in automotive applications?

Yes, the AT25320A-10PI-1.8 is qualified for automotive-grade operation with an industrial temperature range of −40°C to +85°C and is available in lead-free/halogen-free variants. Its 1.8V–5.5V supply range, 1 million write endurance, and hardware write protection make it suitable for body control modules, infotainment configuration storage, and ADAS subsystem logging - provided system-level AEC-Q100 qualification is confirmed per application.