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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology 23A1024-E/ST

Name: 23A1024-E/ST
Brand: Microchip Technology
SKU: 23A1024-E/ST
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 23A1024-E/ST

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-TSSOP (0.173", 4.40mm Width)

Datasheet:: 23A1024-E/ST.pdf

Description:: IC SRAM 1MBIT SPI/QUAD 8TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:3,658

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Product details

Overview

23A1024-E/ST from Microchip Technology is a 1 Mbit (128K × 8) low-voltage serial SRAM with SPI, SDI, and SQI interfaces, operating from 1.7–2.2 V across –40°C to +125°C. It delivers 20 MHz clock rate in SPI/SDI modes (16 MHz in E-temp), supports byte/page/sequential read/write, and features zero write time and unlimited endurance. It serves as fast, nonvolatile-cache memory in automotive infotainment bootloaders requiring deterministic access under wide temperature swings.

For engineers reviewing the 23A1024-E/ST datasheet, 23A1024-E/ST pinout, 23A1024-E/ST application, or 23A1024-E/ST equivalent, this page provides verified electrical specs, validated pin functions for TSSOP-8 package, confirmed E-temp operation limits, and real-world interface timing constraints for SDI/SQI mode transitions and HOLD behavior in SPI mode.

Technical Context

The 23A1024-E/ST implements a synchronous serial interface with three configurable bus modes: standard SPI (SI/SO), dual I/O (SDI using SIO0/SIO1), and quad I/O (SQI using SIO0–SIO3). Its internal 24-bit address counter supports automatic wraparound in sequential mode and page-boundary rollover in page mode (32-byte pages).

It uses CMOS technology with active read current of ≤10 mA at 2.2 V/20 MHz and standby current of ≤4 µA at +85°C (≤12 µA at +125°C). The MODE register (bits 7:6) selects byte/page/sequential operation, and RDMR/WRMR instructions enable runtime mode reconfiguration without reset.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	1 Mbit (128K × 8 bits); enables storage of firmware patches or configuration tables in space-constrained automotive ECUs.
VCC Range	1.7–2.2 V; compatible with 1.8 V power rails in modern microcontrollers and avoids level-shifting in low-power domains.
Temperature Range	–40°C to +125°C (E-grade); qualified for under-hood automotive applications where thermal cycling exceeds industrial limits.
Max Clock Frequency	16 MHz in E-temp; defines maximum sustained data throughput of ~16 MB/s in SPI mode for real-time logging buffers.
Page Size	32 bytes; constrains burst writes to aligned boundaries-critical for optimizing DMA transfers in MCU-based telematics modules.
Write Endurance	Unlimited read/write cycles; eliminates wear-leveling firmware overhead in high-frequency sensor data buffering.
Data Retention Voltage	1.0 V minimum; ensures RAM contents survive brown-out events down to ultra-low supply levels during ignition transients.

Pinout & Package

8-lead TSSOP (4.4 mm body width), RoHS-compliant, moisture-sensitive level 3 per J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
1: CS	Chip Select Input	Active-low enable; must remain low for entire SPI/SDI/SQI transaction; forces SO into high-Z when high, enabling multi-device bus sharing.
2: SO/SIO1	Serial Output / Dual/Quad I/O	Output-only in SPI mode; bidirectional in SDI/SQI; latched on SCK rising edge (input), updated after SCK falling edge (output).
3: SIO2	Serial I/O 2 (SQI only)	Unused and must not float in SPI/SDI modes; pulled high to recover from accidental SQI entry; carries nibble data in SQI mode.
4: VSS	Ground Reference	Primary return path for all I/O and core logic; requires low-inductance connection to minimize switching noise coupling into SRAM array.
5: SI/SIO0	Serial Input / Dual/Quad I/O	Input-only in SPI mode; bidirectional in SDI/SQI; receives instruction/address/data MSB-first; latched on SCK rising edge.
6: SCK	Serial Clock Input	Synchronizes all data transfers; rising edge latches inputs, falling edge updates outputs; max 16 MHz in E-temp per AC specs.
7: HOLD/SIO3	Hold Control / Quad I/O	Pauses ongoing SPI transfer without aborting (SCK low required); disabled in SQI mode; must be held high when unused.
8: VCC	Power Supply	1.7–2.2 V input; decoupling capacitor (≥100 nF) required within 5 mm for stable read/write margins across temperature.

Key Features

Feature	Design Value
Triple-Interface Support (SPI/SDI/SQI)	Enables scalable bandwidth: 20 Mbps (SPI), 40 Mbps (SDI), or 80 Mbps (SQI) - selectable via EDIO/EQIO commands without hardware change.
Zero Write Time Architecture	Eliminates write-cycle delays; data is stored immediately upon CS deactivation - critical for timestamp-critical event logging in ADAS systems.
E-Temp Qualified Operation	Guaranteed functionality from –40°C to +125°C with full AC timing compliance, supporting placement near powertrain controllers or radar modules.
Page and Sequential Read/Write Modes	Reduces command overhead: sequential mode reads/writes entire 128K array with single instruction + address, minimizing MCU firmware complexity.
HOLD Function in SPI Mode	Allows pausing active transfers (e.g., during interrupt servicing) without losing internal address state - preserves deterministic latency in real-time OS contexts.

Applications

Automotive Telematics Data Buffer	Industrial PLC Configuration Store
Use Scenario: Captures GPS position, cellular signal strength, and CAN bus diagnostics during vehicle motion, then batches uploads during Wi-Fi connectivity windows. IC Role / Device Role / Timing Role: High-speed serial SRAM acting as volatile ring buffer between MCU and modem; accepts continuous 16 MHz SPI writes while enabling burst reads to host processor. Use Value: 128K capacity holds >30 seconds of 100 Hz sensor data; E-temp rating ensures reliability in dashboard-mounted units exposed to solar loading.	Use Scenario: Stores dynamic I/O mapping, PID tuning parameters, and recipe data in modular PLC backplanes where firmware updates occur in-field without EEPROM wear concerns. IC Role / Device Role / Timing Role: Nonvolatile-cache SRAM interfaced via SPI to ARM Cortex-M7 controller; retains settings across power cycles using VCC hold-up capacitors. Use Value: Unlimited endurance removes need for wear-leveling algorithms; 1.7–2.2 V range matches isolated 1.8 V I/O domain of industrial Ethernet PHYs.
Medical Infusion Pump Firmware Cache	Avionics Display Bootloader Memory
Use Scenario: Temporarily caches decrypted firmware images during secure OTA updates, ensuring atomic writes before validation and execution. IC Role / Device Role / Timing Role: Secure-access SRAM holding encrypted payload fragments; accessed via SPI with strict timing windows enforced by HOLD pin suspension during crypto operations. Use Value: Zero write time prevents partial-image corruption; 125°C rating supports operation near motor drivers in portable infusion devices.	Use Scenario: Holds decompressed display assets (fonts, icons, UI bitmaps) during cold-start initialization of cockpit multifunction displays, reducing boot time vs. NAND flash. IC Role / Device Role / Timing Role: High-reliability serial SRAM mapped into ARM A53's AXI bus via SPI-to-AHB bridge; supplies pixel data at 60 fps with minimal latency jitter. Use Value: 20 MHz SPI clock (16 MHz E-temp) sustains >1.2 MB/s throughput - sufficient for 800×480 RGB565 frame loads in <300 ms.

Automotive Telematics Data Buffer

Industrial PLC Configuration Store

Use Scenario: Captures GPS position, cellular signal strength, and CAN bus diagnostics during vehicle motion, then batches uploads during Wi-Fi connectivity windows.

IC Role / Device Role / Timing Role: High-speed serial SRAM acting as volatile ring buffer between MCU and modem; accepts continuous 16 MHz SPI writes while enabling burst reads to host processor.

Use Value: 128K capacity holds >30 seconds of 100 Hz sensor data; E-temp rating ensures reliability in dashboard-mounted units exposed to solar loading.

Use Scenario: Stores dynamic I/O mapping, PID tuning parameters, and recipe data in modular PLC backplanes where firmware updates occur in-field without EEPROM wear concerns.

IC Role / Device Role / Timing Role: Nonvolatile-cache SRAM interfaced via SPI to ARM Cortex-M7 controller; retains settings across power cycles using VCC hold-up capacitors.

Use Value: Unlimited endurance removes need for wear-leveling algorithms; 1.7–2.2 V range matches isolated 1.8 V I/O domain of industrial Ethernet PHYs.

Medical Infusion Pump Firmware Cache

Avionics Display Bootloader Memory

Use Scenario: Temporarily caches decrypted firmware images during secure OTA updates, ensuring atomic writes before validation and execution.

IC Role / Device Role / Timing Role: Secure-access SRAM holding encrypted payload fragments; accessed via SPI with strict timing windows enforced by HOLD pin suspension during crypto operations.

Use Value: Zero write time prevents partial-image corruption; 125°C rating supports operation near motor drivers in portable infusion devices.

Use Scenario: Holds decompressed display assets (fonts, icons, UI bitmaps) during cold-start initialization of cockpit multifunction displays, reducing boot time vs. NAND flash.

IC Role / Device Role / Timing Role: High-reliability serial SRAM mapped into ARM A53's AXI bus via SPI-to-AHB bridge; supplies pixel data at 60 fps with minimal latency jitter.

Use Value: 20 MHz SPI clock (16 MHz E-temp) sustains >1.2 MB/s throughput - sufficient for 800×480 RGB565 frame loads in <300 ms.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
23LC1024-E/ST	Wider VCC range (2.5–5.5 V); same pinout, timing, and feature set except voltage tolerance.	Requires level-shifting if interfacing with 1.8 V MCUs; unsuitable for direct replacement in 1.7–2.2 V systems.	Select only if system already uses 3.3 V or 5 V supply and needs identical E-temp performance with higher voltage margin.
FM25V10-G	F-RAM technology; 1 Mbit density; 2.0–3.6 V; 40 MHz SPI; no write delay; but limited to –40°C to +85°C (I-temp only).	Lacks E-temp qualification; cannot replace 23A1024-E/ST in under-hood or avionics applications requiring +125°C operation.	Consider for industrial control panels where extended temperature is unnecessary and faster write throughput is prioritized over automotive qualification.

Compared with 23LC1024-E/ST and FM25V10-G, the 23A1024-E/ST uniquely satisfies 1.7–2.2 V operation *and* E-temp qualification in a single TSSOP-8 package-making it the only drop-in solution for next-gen automotive MCUs with ultra-low-voltage I/O domains.

Availability

23A1024-E/ST is available at Aetrix Electronics and suitable for automotive telematics, industrial PLCs, medical infusion pumps, and avionics display systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 23A1024-E/ST 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, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 23A1024/23LC1024 product line was designed specifically for high-reliability serial memory applications in automotive, industrial, and medical systems where low-voltage operation, extended temperature support, and interface flexibility (SPI/SDI/SQI) are mandatory.

FAQ

What is the maximum clock frequency supported by the 23A1024-E/ST in automotive temperature conditions?

The 23A1024-E/ST supports up to 16 MHz in Extended temperature range (–40°C to +125°C), as specified in Table 1-2 AC Characteristics. This limit applies to all bus modes (SPI, SDI, SQI) and ensures setup/hold timing margins are maintained across the full operating range. Exceeding 16 MHz may cause read/write failures in high-temperature environments.

Does the 23A1024-E/ST support true quad-SPI (QSPI) protocol with four data lines and dual-directional DQS?

No, the 23A1024-E/ST implements Serial Quad Interface (SQI), not QSPI. It uses SIO0–SIO3 for 4-bit-per-clock data transfers but lacks DQS strobe, DDR capability, or command/address quad mode. SQI is proprietary to Microchip and requires compatible master firmware-not standard QSPI controllers found in many SoCs.

Can the HOLD function be used while the 23A1024-E/ST is operating in SDI or SQI mode?

No. The HOLD function is only available in SPI mode. In SDI and SQI modes, pin 7 (HOLD/SIO3) becomes a bidirectional I/O (SIO3) and the HOLD suspend feature is disabled. Attempting to assert HOLD in SDI/SQI mode has no effect on serial communication.

What is the purpose of the SIO2 pin on the 23A1024-E/ST, and how should it be handled in SPI mode?

In SPI mode, SIO2 (pin 3) is unused and must not be left floating. Per Section 3.3, it should be pulled high (e.g., via 10 kΩ resistor to VCC) to ensure reliable recovery from accidental SQI entry via EQIO command. Leaving it unconnected risks bus lockup or undefined behavior during mode transitions.

How does the 23A1024-E/ST handle address boundary crossing during sequential read operations?

The 23A1024-E/ST automatically increments its internal address pointer during sequential reads. When the pointer reaches the highest address (0x1FFFF), it rolls over to 0x00000 and continues reading - enabling infinite-loop streaming without software intervention. This behavior is guaranteed across all temperature grades and supply voltages within spec.

23A1024-E/ST Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-TSSOP (0.173", 4.40mm Width)

Packaging:: Tube

Product Status:: Active

Programmable:: Not Verified

Memory Type:: Volatile

Memory Format:: SRAM

Technology:: SRAM

Memory Size:: 1Mbit

Memory Organization:: 128K x 8

Memory Interface:: SPI - Quad I/O

Clock Frequency:: 16 MHz

Write Cycle Time - Word, Page:: -

Access Time:: -

Voltage - Supply:: 1.7V ~ 2.2V

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-TSSOP

23A1024-E/ST FAQ

1.How can I place an order for 23A1024-E/ST through Aetrix?

Please submit a Request for Quotation (RFQ) for 23A1024-E/ST on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 23A1024-E/ST reliable?

The price and inventory of 23A1024-E/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 23A1024-E/ST is usually 5 days.

3.What payment methods are accepted for 23A1024-E/ST?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 23A1024-E/ST transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 23A1024-E/ST?

23A1024-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 23A1024-E/ST order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 23A1024-E/ST?

For technical support, including 23A1024-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 23A1024-E/ST requirements.

6.How does Aetrix verify that 23A1024-E/ST is sourced from the original manufacturer or authorized distributors?

All 23A1024-E/ST products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 23A1024-E/ST meets industry standards.

7.What is the process for return or replacement of 23A1024-E/ST?

All 23A1024-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 23A1024-E/ST, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 23A1024-E/ST part is unused and in its original packaging.

Return procedure for 23A1024-E/ST:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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