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Microchip Technology 23A1024T-I/ST
- Part No.:
- 23A1024T-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
23A1024T-I/ST.pdf
- Description:
- IC SRAM 1MBIT SPI/QUAD 8TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
23A1024T-I/ST 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 +85°C. It delivers 20 MHz clock rate in SPI/SDI/SQI modes, 3 mA read current at 5.5 V (typical), 4 µA standby current at +85°C, and unlimited read/write cycles - used for real-time data buffering in industrial microcontroller systems requiring fast nonvolatile-adjacent memory.
For engineers reviewing the 23A1024T-I/ST datasheet, 23A1024T-I/ST pinout, 23A1024T-I/ST application, or 23A1024T-I/ST equivalent, key selection criteria include voltage compatibility (1.7–2.2 V), TSSOP-8 package footprint, HOLD/SIO3 dual-role pin behavior, SDI/SQI mode entry via EDIO/EQIO commands, and page/sequential write constraints within 32-byte boundaries.
Technical Context
The 23A1024T-I/ST implements a serial SRAM architecture with three configurable access modes (Byte, Page, Sequential) controlled by bits 7–6 of an 8-bit MODE register. Its SPI-compatible bus supports full-duplex communication using SI/SO pins, while SDI mode enables bidirectional dual-line transfers (SIO0/SIO1), and SQI mode adds SIO2/SIO3 for quad-line operation - all sharing the same 24-bit address space and instruction set (e.g., 0x02 WRITE, 0x03 READ, 0x3B EDIO).
Power management includes automatic Standby mode on CS high, with data retention down to 1.0 V VCC. The HOLD pin functions as a suspend/resume control in SPI/SDI modes but is repurposed as SIO3 in SQI mode - disabling HOLD functionality when quad interface is active. Timing compliance is specified across Industrial (–40°C to +85°C) and Automotive (–40°C to +125°C) temperature ranges, with AC parameters including 25 ns minimum CS setup time and 25 ns output valid delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Mbit (128K × 8), organized as 32-byte pages - enables efficient burst writes without crossing page boundaries. |
| Supply Voltage | 1.7–2.2 V - compatible with modern ultra-low-power MCUs and battery-backed systems. |
| Max Clock Frequency | 20 MHz (Industrial temp) - supports 2.5 MB/s throughput in SPI mode, 5 MB/s in SDI, 10 MB/s in SQI. |
| Read Current | 3 mA at 5.5 V, 20 MHz - actual draw scales with VCC and frequency; typical 1 mA at 2.2 V. |
| Standby Current | 4 µA at +85°C - ensures minimal power drain during idle periods in always-on industrial nodes. |
| Data Retention Voltage | 1.0 V - guarantees RAM data integrity during brown-out conditions down to this threshold. |
| Interface Modes | SPI (4-wire), SDI (dual I/O), SQI (quad I/O) - selectable via EDIO/EQIO/RSTIO commands; no hardware reconfiguration needed. |
Pinout & Package
23A1024T-I/ST is housed in an 8-lead TSSOP package (4.4 mm body width, JEDEC MO-153), with lead finish Matte Tin (Pb-free). Pin 1 is CS, pin 8 is VCC; pin 3 (SIO2) is unused in SPI/SDI modes and must be pulled high to prevent unintended SQI activation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select Input | Active-low enable; forces device into Standby (high-Z SO) when deasserted - essential for multi-device SPI bus sharing. |
| SO/SIO1 (Pin 2) | Serial Output / Dual/Quad I/O | Output-only in SPI mode; bidirectional in SDI/SQI - carries MSB-first data aligned to SCK falling edge. |
| SIO2 (Pin 3) | Serial I/O 2 (SQI only) | Unused in SPI/SDI; must not float - pull high to safely recover from accidental EQIO command. |
| VSS (Pin 4) | Ground Reference | Primary return path for all I/O and core logic; requires low-impedance connection to minimize noise coupling. |
| SI/SIO0 (Pin 5) | Serial Input / Dual/Quad I/O | Input-only in SPI mode; bidirectional in SDI/SQI - latches data on SCK rising edge. |
| SCK (Pin 6) | Serial Clock Input | Master-generated clock synchronizing all data transfers; rise/fall times ≤20 ns required for timing compliance. |
| HOLD/SIO3 (Pin 7) | Hold Control / Serial I/O 3 | Pauses ongoing SPI/SDI transfer without resetting state; disabled and repurposed as SIO3 in SQI mode. |
| VCC (Pin 8) | Power Supply | 1.7–2.2 V supply with ±1 µA input leakage; decoupling capacitor (0.1 µF) required near pin for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Zero Write Time | No internal write cycle delay - data written on final clock edge of WRITE command; eliminates polling or timeout waits. |
| Unlimited Read/Write Cycles | Endures >10⁶ write cycles per location without degradation - suitable for high-frequency logging or buffer ring applications. |
| Multi-Mode Interface Flexibility | Single device supports SPI (4-wire), SDI (2-wire bidirectional), and SQI (4-wire bidirectional) via software commands - reduces BOM count across product variants. |
| Page-Based Write Protection | Automatic address wrap at 32-byte page boundary prevents accidental overwrite beyond intended page - simplifies firmware address management. |
| Low-Voltage Data Retention | Maintains stored data down to 1.0 V VCC - enables graceful shutdown and recovery in energy-harvesting or backup-supply systems. |
Applications
| Industrial PLC Data Buffering | Medical Sensor Data Acquisition |
|---|---|
Use Scenario: Real-time collection of analog sensor readings (e.g., temperature, pressure) in programmable logic controllers with deterministic scan cycles. IC Role / Device Role / Timing Role: High-speed serial SRAM acting as a temporary FIFO between ADC peripherals and ARM Cortex-M host MCU, synchronized via SPI clock. Use Value: Enables zero-latency write operations (no wait states) and 20 MHz burst reads - sustaining 2.5 MB/s throughput for multi-channel 16-bit sampling at 156 kSPS. | Use Scenario: Portable ECG monitor capturing raw waveform data during patient ambulation, with intermittent wireless upload. IC Role / Device Role / Timing Role: Low-power memory buffer storing up to 128 KB of compressed waveform samples before BLE transmission. Use Value: 4 µA standby current extends battery life; 1.7–2.2 V operation matches single-cell LiFePO₄ supply; SDI mode doubles throughput vs. SPI without extra pins. |
| Automotive ADAS Pre-Event Logging | Smart Meter Firmware Update Cache |
Use Scenario: Continuous circular logging of CAN bus diagnostics and camera metadata prior to collision detection trigger in Level 2 ADAS systems. IC Role / Device Role / Timing Role: Nonvolatile-adjacent SRAM providing deterministic write latency (<100 ns) for time-critical pre-event snapshots. Use Value: 20 MHz SQI interface achieves 10 MB/s read speed for rapid post-trigger dump; -40°C to +125°C rating meets AEC-Q100 Grade 2 requirements. | Use Scenario: Over-the-air (OTA) firmware update staging area in utility smart meters, where code integrity and power failure resilience are critical. IC Role / Device Role / Timing Role: Secure, fast-access cache holding decrypted firmware image segments before flash programming. Use Value: Unlimited write endurance avoids wear leveling complexity; 1.0 V data retention ensures image persistence during grid brownouts; TSSOP-8 footprint fits constrained meter PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 23LC1024T-I/ST | Wider VCC range (2.5–5.5 V); identical pinout and instruction set; higher standby current (10 µA at +85°C). | Compatible with 3.3 V or 5 V systems; unsuitable for sub-2.2 V battery operation. | Select when legacy 3.3 V MCU interfaces or higher noise margin is required; verify HOLD/SIO3 behavior remains consistent. |
| FM25V10-G | F-RAM technology; 2.0–3.6 V supply; 40 MHz SPI clock; 150 µA active current; no write endurance limit. | Superior write speed and lower active power; lacks SDI/SQI modes; different instruction set and timing. | Choose for ultra-low-energy write-intensive applications where quad interface is unnecessary and voltage range aligns. |
Compared with 23LC1024T-I/ST and FM25V10-G, the 23A1024T-I/ST uniquely balances ultra-low-voltage operation (1.7–2.2 V), multi-mode interface flexibility (SPI/SDI/SQI), and industrial-grade reliability - making it optimal for next-gen portable and energy-constrained embedded systems where pin efficiency and voltage scalability are critical.
Availability
23A1024T-I/ST is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, automotive diagnostics, and smart metering applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for 23A1024T-I/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 microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 23A1024/23LC1024 family was designed specifically for embedded systems needing fast, reliable, low-power serial memory with flexible interface options - targeting industrial control, automotive subsystems, and portable medical devices where board space and power budget are constrained.
FAQ
What is the maximum clock frequency supported by the 23A1024T-I/ST in Industrial temperature range?
The 23A1024T-I/ST supports a maximum clock frequency of 20 MHz when operated across the Industrial temperature range (–40°C to +85°C). This applies to all interface modes - SPI, SDI, and SQI - and is validated under DC and AC electrical specifications in the official Microchip datasheet DS20005142C. Operation above 20 MHz is not guaranteed and may result in timing violations or data corruption.
Does the 23A1024T-I/ST support Quad SPI (QSPI) mode, and how is it enabled?
Yes, the 23A1024T-I/ST supports Serial Quad Interface (SQI) mode, which is distinct from standard QSPI but functionally equivalent for high-speed quad-data transfers. It is enabled by issuing the EQIO command (0x38) via the SPI bus. Once activated, pins SIO0–SIO3 become bidirectional data lines, and the HOLD function is disabled. The 23A1024T-I/ST must remain selected (CS low) during mode transition, and SIO2 must be externally pulled high if not used.
What is the purpose of the HOLD pin on the 23A1024T-I/ST, and does it work in all interface modes?
The HOLD pin on the 23A1024T-I/ST suspends ongoing serial communication without resetting the internal state - allowing the host MCU to service higher-priority interrupts and resume exactly where it left off. However, HOLD functionality is only active in SPI and SDI modes. In SQI mode, pin 7 is repurposed as SIO3, and HOLD is disabled. This behavior is explicitly documented in Section 3.6 of the 23A1024/23LC1024 datasheet.
Can the 23A1024T-I/ST retain data during power loss, and what is the minimum retention voltage?
Yes, the 23A1024T-I/ST retains stored data during brown-out conditions down to a minimum VCC of 1.0 V, as specified in the "RAM Data Retention Voltage" parameter (D011) of the datasheet. This value is periodically sampled and not 100% tested, but ensures functional data hold across typical low-voltage transients. Below 1.0 V, data loss becomes probable; external backup capacitors or supercapacitors are recommended for extended hold time.
How many bytes can be written in a single Page Write operation on the 23A1024T-I/ST?
The 23A1024T-I/ST supports 32-byte Page Write operations. Its 128K × 8 memory array is divided into 4096 pages of 32 bytes each. When operating in Page mode (MODE register bits 7:6 = 10), the internal address counter increments automatically after each byte, wrapping to the start of the same page upon reaching the 32nd byte - preventing accidental overflow into adjacent pages unless explicitly managed in firmware.
23A1024T-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 20 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
23A1024T-I/ST FAQ
1.How can I place an order for 23A1024T-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 23A1024T-I/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 23A1024T-I/ST reliable?
The price and inventory of 23A1024T-I/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 23A1024T-I/ST is usually 5 days.
3.What payment methods are accepted for 23A1024T-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 23A1024T-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 23A1024T-I/ST?
23A1024T-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 23A1024T-I/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 23A1024T-I/ST?
For technical support, including 23A1024T-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 23A1024T-I/ST requirements.
6.How does Aetrix verify that 23A1024T-I/ST is sourced from the original manufacturer or authorized distributors?
All 23A1024T-I/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 23A1024T-I/ST meets industry standards.
7.What is the process for return or replacement of 23A1024T-I/ST?
All 23A1024T-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 23A1024T-I/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 23A1024T-I/ST part is unused and in its original packaging.
Return procedure for 23A1024T-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
23A1024T-I/ST Tags
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