Microchip Technology 23A1024T-E/SN

Overview

23A1024T-E/SN from Microchip Technology is a 1 Mbit (128K × 8) low-voltage SPI Serial SRAM with SDI and SQI interface support, operating from 1.7–2.2 V over –40°C to +125°C. It delivers 20 MHz clock rate in SPI/SDI/SQI modes, 3 mA read current at 2.2 V, and zero write time with unlimited endurance. Used for real-time data buffering in automotive engine control units requiring fast nonvolatile-adjacent memory.

For engineers reviewing the 23A1024T-E/SN datasheet, 23A1024T-E/SN pinout, 23A1024T-E/SN application, or 23A1024T-E/SN equivalent, key selection criteria include its 1.7–2.2 V supply range, E-temp qualification, SOIC-8 packaging, SDI/SQI multi-I/O capability, and page/sequential access modes - all critical for space-constrained, high-reliability embedded systems.

Technical Context

The 23A1024T-E/SN implements a serial SRAM architecture with three configurable access modes (Byte/Page/Sequential) controlled via a writable MODE register. Its dual- and quad-I/O capability relies on dedicated SIO0–SIO3 pins, enabling 2-bit or 4-bit transfers per clock cycle without altering core SPI timing protocol.

It supports HOLD functionality in SPI/SDI modes (suspends ongoing transfers while maintaining internal state), but HOLD is disabled in SQI mode where SIO2 and SIO3 become active data lines. The device powers up in Standby mode and requires CS low-to-high transition to initiate operation.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (3.90 mm body), RoHS-compliant, tape-and-reel (T suffix), rated for –40°C to +125°C (E-temp).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 23LC1024T-E/SN, the 23A1024T-E/SN offers lower voltage operation critical for modern 1.8 V MCUs but trades off slightly higher E-temp standby current; versus the IS61WV102416BLL-10MLI, it saves board space and MCU pin count at the cost of serial latency - making it optimal for SPI-limited, power-sensitive automotive modules.

Availability

23A1024T-E/SN is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC data loggers, medical infusion pump controllers, and avionics health monitoring modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 23A1024T-E/SN 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 Inc. is a leading provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, serving automotive, industrial, consumer, and communications markets.

The 23A1024/23LC1024 family was designed specifically for high-reliability serial memory expansion in resource-constrained embedded systems, emphasizing low-voltage operation, multi-I/O flexibility, and automotive-grade temperature resilience.

FAQ

What is the operating voltage range for the 23A1024T-E/SN?

The 23A1024T-E/SN operates from 1.7 V to 2.2 V, making it compatible with 1.8 V logic systems. This narrow range ensures stable performance in low-power automotive and industrial applications where supply rails are tightly regulated. Operation outside this range may cause functional failure or data corruption. The 23A1024T-E/SN is not rated for 2.5 V or higher supplies - use 23LC1024T-E/SN for wider voltage support.

Does the 23A1024T-E/SN support Quad SPI (QSPI) mode?

Yes, the 23A1024T-E/SN supports Serial Quad Interface (SQI) mode via the EQIO command, enabling four-bit-per-clock data transfers using SIO0–SIO3 pins. In SQI mode, the HOLD function is disabled and pin 7 becomes SIO3. The 23A1024T-E/SN achieves up to 80 Mbps effective throughput in SQI mode at 20 MHz clock - double the rate of SDI and quadruple standard SPI - verified in DS20005142C Section 4.2.

What is the maximum clock frequency for the 23A1024T-E/SN at extended temperature?

The 23A1024T-E/SN supports a maximum clock frequency of 16 MHz when operating across the full –40°C to +125°C extended temperature range (E-temp). This is explicitly specified in Table 1-2 (AC CHARACTERISTICS) of DS20005142C. At industrial temperature (–40°C to +85°C), it supports up to 20 MHz. Exceeding 16 MHz at +125°C risks setup/hold timing violations and data corruption.

How does the HOLD function work on the 23A1024T-E/SN?

The HOLD function on the 23A1024T-E/SN suspends ongoing SPI transfers without resetting internal state: pull HOLD low while SCK is low to pause, then raise HOLD high while SCK remains low to resume. HOLD is active only in SPI and SDI modes - it is disabled in SQI mode where pin 7 serves as SIO3. The 23A1024T-E/SN's HOLD timing is validated per Figure 1-1 and Section 3.6, with THS = 10 ns and THH = 10 ns minimum.

What package type and marking does the 23A1024T-E/SN use?

The 23A1024T-E/SN uses an 8-lead SOIC (3.90 mm body) package with tape-and-reel delivery (indicated by the "T" suffix). Marking includes "23A1024I" or "23A1024E" depending on temperature grade, year/week code (e.g., "1328"), and traceability characters (e.g., "1L7"), as defined in DS20005142C page 19. The "SN" in the part number confirms SOIC packaging per Microchip's Product Identification System.