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

Microchip Technology 23A512-E/ST

Name: 23A512-E/ST
Brand: Microchip Technology
SKU: 23A512-E/ST
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 23A512-E/ST

Manufacturer:: Microchip Technology

Category:: Memory

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

Datasheet:: 23A512-E/ST.pdf

Description:: IC SRAM 512KBIT SPI/QUAD 8TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:2,980

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Product details

Overview

23A512-E/ST from Microchip Technology is a 512-Kbit serial SRAM with SPI/SDI/SQI interface, operating at 1.7V–2.2V supply and supporting Industrial (−40°C to +85°C) and Extended (−40°C to +125°C) temperature ranges. It delivers 20 MHz clock rate, 3 mA read current at 2.2V/20 MHz, 4 µA standby current at +85°C, and 64K × 8-bit organization with 32-byte page size - deployed in embedded microcontroller systems requiring fast, nonvolatile-adjacent volatile memory with zero write time.

For engineers reviewing the 23A512-E/ST datasheet, 23A512-E/ST pinout, 23A512-E/ST application, or 23A512-E/ST equivalent, key selection criteria include its dual/quad I/O capability, low-voltage operation, page/sequential access modes, HOLD functionality (SPI/SDI only), and TSSOP-8 package compatibility with space-constrained industrial controllers and automotive body electronics.

Technical Context

The 23A512-E/ST implements a synchronous serial interface with three configurable data transfer modes: standard SPI (SI/SO), Serial Dual Interface (SDI using SIO0/SIO1), and Serial Quad Interface (SQI using SIO0–SIO3). Its internal 16-bit address pointer supports byte, page (32-byte), and sequential read/write operations, with automatic rollover at FFFFh.

It features an 8-bit instruction register for command decoding (e.g., READ 0x03, WRITE 0x02, RDMR 0x05), MODE register control (bits 7:6 define operation mode), and dedicated HOLD pin for transaction suspension - disabled only in SQI mode due to pin function sharing.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	512 Kbit (64K × 8-bit) - provides sufficient buffer space for real-time sensor data logging or firmware stack expansion in resource-limited MCUs.
Interface Modes	SPI / SDI / SQI - enables scalable bandwidth: 20 MHz single-bit, ~40 MB/s dual-bit, ~80 MB/s quad-bit throughput depending on host controller support.
VCC Range	1.7V–2.2V - optimized for low-power 1.8V system rails, eliminating level-shifting in modern ultra-low-power microcontrollers.
Max Clock Frequency	20 MHz (Industrial temp); 16 MHz (Extended temp) - defines maximum sustained data transfer rate without timing violations across temperature range.
Standby Current	4 µA at +85°C - ensures minimal power draw during MCU sleep cycles, critical for battery-backed or energy-harvesting applications.
Page Size	32 bytes - balances burst efficiency and write granularity; allows partial-page updates without erasing full sectors as in flash.
Data Retention Voltage	1.0 V - guarantees RAM contents persist down to brown-out thresholds, enabling graceful shutdown and resume in power-fail scenarios.

Pinout & Package

23A512-E/ST is packaged in an 8-lead TSSOP (ST) with 0.65 mm pitch, 3.0 mm × 4.4 mm body, and RoHS-compliant matte tin finish. Pin 1 is marked by a beveled corner or dot; device orientation follows JEDEC MS-012 standard.

Pin/Terminal	Circuit Role	Design Meaning
CS	Chip Select Input	Active-low enable: drives device into active state when low; forces high-impedance SO and Standby mode when high.
SO/SIO1	Serial Output / SDI/SQI Data Line	Outputs read data in SPI mode; serves as bidirectional data line 1 in SDI/SQI - requires pull-up only in SPI mode.
SIO2	SQI Data Line 2	Dedicated input/output in SQI mode; must not float in SDI mode per datasheet note - tied to VSS or VCC if unused.
VSS	Ground Reference	Primary return path for all I/O and core logic; requires low-inductance connection to minimize noise coupling into SRAM array.
SI/SIO0	Serial Input / SDI/SQI Data Line	Accepts commands, addresses, and write data in SPI mode; bidirectional data line 0 in SDI/SQI - shares pin with SI.
SCK	Serial Clock Input	Edge-triggered timing reference: latches SI on rising edge, updates SO on falling edge - dictates maximum bus speed.
HOLD/SIO3	Hold Control / SQI Data Line 3	Suspends ongoing SPI/SDI transfers without resetting address pointer; disabled and repurposed as SQI I/O in quad mode.
VCC	Power Supply	1.7V–2.2V core supply; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin to suppress switching noise.

Key Features

Feature	Design Value
Zero Write Time	Eliminates wait states during write operations - enables deterministic real-time response in interrupt-driven data capture.
Unlimited Read/Write Cycles	Supports continuous logging or buffering over product lifetime without wear-out concerns unlike flash or EEPROM.
Three Access Modes	Byte (single-location), Page (32-byte burst), Sequential (full-array wraparound) - selectable via MODE register for optimal bandwidth vs. address control.
HOLD Function	Pauses active SPI/SDI transactions mid-sequence; preserves internal address pointer and state - simplifies multi-master arbitration.
SDI/SQI Compatibility	Backward-compatible with legacy SPI hosts while enabling higher throughput with dual/quad-capable controllers - no PCB redesign needed.

Applications

Automotive Body Control Module	Industrial PLC I/O Buffer
Use Scenario: Storing transient CAN message payloads and diagnostic event logs during vehicle ignition cycles. IC Role / Device Role / Timing Role: Volatile high-speed buffer interfacing directly with PIC® MCU SPI port, synchronized to 20 MHz clock for sub-millisecond latency. Use Value: Enables lossless capture of burst CAN traffic without CPU intervention, leveraging page-mode writes to reduce transaction overhead by 31× vs. byte mode.	Use Scenario: Holding real-time analog input samples and output command queues in modular I/O racks with hot-swap capability. IC Role / Device Role / Timing Role: SPI-accessible scratchpad memory co-located with ADC/DAC peripherals, powered from 1.8V rail shared with FPGA fabric. Use Value: Provides deterministic 4 µA standby current during rack sleep mode, extending maintenance intervals and reducing thermal load in enclosed enclosures.
Medical Wearable Sensor Hub	Smart Energy Meter Firmware Cache
Use Scenario: Temporarily aggregating accelerometer, ECG, and SpO₂ data before BLE transmission bursts. IC Role / Device Role / Timing Role: Low-voltage (1.8V) serial SRAM acting as FIFO between sensor hub MCU and wireless transceiver, accessed via sequential read mode. Use Value: Delivers 3 mA active current at 20 MHz - minimizing battery drain during short-duration data uploads while maintaining 200+ hours of standby runtime.	Use Scenario: Caching firmware update fragments and tariff calculation tables during meter firmware upgrades over PLC or RF links. IC Role / Device Role / Timing Role: Nonvolatile-adjacent volatile storage for secure, tamper-resistant code staging - isolated from main flash to prevent corruption during power loss. Use Value: Guarantees data retention down to 1.0 V VCC, allowing safe rollback to last valid firmware image even during brown-out conditions.

Automotive Body Control Module

Industrial PLC I/O Buffer

Use Scenario: Storing transient CAN message payloads and diagnostic event logs during vehicle ignition cycles.

IC Role / Device Role / Timing Role: Volatile high-speed buffer interfacing directly with PIC® MCU SPI port, synchronized to 20 MHz clock for sub-millisecond latency.

Use Value: Enables lossless capture of burst CAN traffic without CPU intervention, leveraging page-mode writes to reduce transaction overhead by 31× vs. byte mode.

Use Scenario: Holding real-time analog input samples and output command queues in modular I/O racks with hot-swap capability.

IC Role / Device Role / Timing Role: SPI-accessible scratchpad memory co-located with ADC/DAC peripherals, powered from 1.8V rail shared with FPGA fabric.

Use Value: Provides deterministic 4 µA standby current during rack sleep mode, extending maintenance intervals and reducing thermal load in enclosed enclosures.

Medical Wearable Sensor Hub

Smart Energy Meter Firmware Cache

Use Scenario: Temporarily aggregating accelerometer, ECG, and SpO₂ data before BLE transmission bursts.

IC Role / Device Role / Timing Role: Low-voltage (1.8V) serial SRAM acting as FIFO between sensor hub MCU and wireless transceiver, accessed via sequential read mode.

Use Value: Delivers 3 mA active current at 20 MHz - minimizing battery drain during short-duration data uploads while maintaining 200+ hours of standby runtime.

Use Scenario: Caching firmware update fragments and tariff calculation tables during meter firmware upgrades over PLC or RF links.

IC Role / Device Role / Timing Role: Nonvolatile-adjacent volatile storage for secure, tamper-resistant code staging - isolated from main flash to prevent corruption during power loss.

Use Value: Guarantees data retention down to 1.0 V VCC, allowing safe rollback to last valid firmware image even during brown-out conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Cypress CY14B108L-SP25XI	8-Mbit density, 2.7–3.6V VCC, SPI-only interface, no SDI/SQI, 25 MHz max clock	Higher capacity but incompatible voltage range; lacks multi-I/O flexibility for 1.8V systems	Select only if >512 Kbit memory and 3.3V operation are mandatory; requires level-shifting or rail redesign for 1.8V hosts.
ON Semiconductor CAT23C512WI-GT3	512 Kbit, 2.5–5.5V VCC, SPI-only, 10 MHz max clock, 10 µA standby at +85°C	Same density but higher voltage and lower speed; no HOLD or multi-I/O support	Use where cost sensitivity outweighs performance and feature requirements; unsuitable for low-voltage or high-throughput designs.

Compared with CY14B108L-SP25XI and CAT23C512WI-GT3, the 23A512-E/ST uniquely combines 1.7V–2.2V operation, 20 MHz speed, SDI/SQI scalability, and HOLD functionality - making it the sole option for compact, low-power, high-flexibility serial SRAM in next-generation industrial and automotive edge nodes.

Availability

23A512-E/ST is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, and medical wearable sensor hubs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 23A512-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, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and development tools.

The 23A512-E/ST belongs to Microchip's serial SRAM product line, designed specifically for seamless integration with PIC® and dsPIC® microcontrollers in space- and power-constrained embedded systems requiring reliable, high-speed volatile memory.

FAQ

What is the operating voltage range for the 23A512-E/ST?

The 23A512-E/ST operates from 1.7V to 2.2V, making it compatible with 1.8V system rails. This narrow range ensures optimal performance and low-power operation without requiring external voltage regulation beyond standard LDOs. Operation outside this window may cause functional failure or data corruption, and the device does not support 2.5V or higher supplies - unlike the 23LC512 family member.

Does the 23A512-E/ST support quad-SPI (QSPI) mode?

Yes, the 23A512-E/ST supports Serial Quad Interface (SQI) mode via the EQIO command (0x38), enabling four-bit-per-clock data transfers using SIO0–SIO3 pins. However, SQI mode disables the HOLD function due to pin reassignment, and requires host controller support for quad I/O signaling - confirmed in DS20005155C Section 4.2.

What package type is used for the 23A512-E/ST part number?

The "-ST" suffix in 23A512-E/ST denotes the 8-lead TSSOP package (Microchip drawing C04-057-ST), measuring 3.0 mm × 4.4 mm with 0.65 mm lead pitch. It is RoHS-compliant, matte tin-plated, and intended for surface-mount reflow assembly - distinct from the SOIC (-SN) and PDIP (-P) variants listed in the Device Selection Table.

How does the HOLD function behave during SDI or SQI operation?

In SDI mode, the HOLD function remains fully operational using the HOLD/SIO3 pin. In SQI mode, HOLD is disabled because SIO3 is repurposed as a data I/O line; attempting to assert HOLD during SQI will disrupt communication. The datasheet explicitly states "Hold functionality is not available when operating in SQI mode" (DS20005155C, Section 3.5).

What are the supported temperature grades for the 23A512-E/ST?

The "-E" suffix indicates Extended temperature grade: −40°C to +125°C. This rating applies to both Industrial (I) and Extended (E) versions per the Device Selection Table, with AC characteristics derated to 16 MHz maximum clock frequency at +125°C ambient - verified in Table 1-2, Param No. 1 (FCLK).

23A512-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:: 512Kbit

Memory Organization:: 64K 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 ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-TSSOP

23A512-E/ST FAQ

1.How can I place an order for 23A512-E/ST through Aetrix?

Please submit a Request for Quotation (RFQ) for 23A512-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 23A512-E/ST reliable?

The price and inventory of 23A512-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 23A512-E/ST is usually 5 days.

3.What payment methods are accepted for 23A512-E/ST?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 23A512-E/ST transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 23A512-E/ST?

23A512-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 23A512-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 23A512-E/ST?

For technical support, including 23A512-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 23A512-E/ST requirements.

6.How does Aetrix verify that 23A512-E/ST is sourced from the original manufacturer or authorized distributors?

All 23A512-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 23A512-E/ST meets industry standards.

7.What is the process for return or replacement of 23A512-E/ST?

All 23A512-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 23A512-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 23A512-E/ST part is unused and in its original packaging.

Return procedure for 23A512-E/ST:

1.Submit a request within 90 days.

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

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