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Microchip Technology 23A512T-I/ST
- Part No.:
- 23A512T-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
23A512T-I/ST.pdf
- Description:
- IC SRAM 512KBIT SPI/QUAD 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,484
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Product details
Overview
23A512T-I/ST from Microchip Technology is a 512-Kbit SPI Serial SRAM with SDI/SQI interface, operating at 1.7V–2.2V supply and supporting Industrial temperature range (−40°C to +85°C). It delivers 20 MHz clock rate, 3 mA read current at 5.5V/20 MHz, 4 µA standby current at +85°C, and 64K × 8-bit organization with 32-byte page size - used in microcontroller-based data buffering where low-voltage operation and fast serial access are required.
For engineers reviewing the 23A512T-I/ST datasheet, 23A512T-I/ST pinout, 23A512T-I/ST application, or 23A512T-I/ST equivalent, this page provides verified technical context, package mapping, functional timing behavior, real-world use scenarios, and validated alternative parts for embedded memory upgrades and industrial control systems.
Technical Context
The 23A512T-I/ST implements a true SPI-compatible serial bus with separate SI/SO lines, plus dual (SDI) and quad (SQI) I/O modes enabled via EDIO/EQIO commands. Its MODE register supports Byte, Page, and Sequential read/write operations - with automatic address incrementing and page boundary wraparound in Page mode.
It features dedicated HOLD functionality (active-low, tri-state SO on assertion), operates in Standby mode when CS is high, and powers on with MODE register defaulting to Sequential mode (01). SQI mode disables HOLD and requires SIO0–SIO3 pins; SDI uses SIO0/SIO1 while retaining HOLD on SIO3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (64K × 8-bit) - supports up to 65,536 bytes of volatile RAM accessible via serial interface. |
| Supply Voltage | 1.7V–2.2V - enables integration into low-power 1.8V systems without level-shifting. |
| Max Clock Frequency | 20 MHz (Industrial temp) - enables 2.5 MB/s peak throughput in SPI mode; higher in SDI/SQI. |
| Read Current | 3 mA at 5.5V/20 MHz - measured under worst-case VCC and speed; actual draw at 2.2V is lower. |
| Standby Current | 4 µA at +85°C - ensures ultra-low power retention during host sleep or idle states. |
| Page Size | 32 bytes - defines maximum burst length per write command before internal address wraps. |
| Data Retention Voltage | 1.0 V - minimum VCC required to retain RAM contents during brown-out or backup operation. |
Pinout & Package
23A512T-I/ST is packaged in an 8-lead SOIC (SN) with 3.90 mm body width, JEDEC MS-012AC compliant, RoHS-compliant matte tin finish. Pin 1 marked by notch or dot; pin 1 location confirmed per Microchip Drawing C04-057-SN Rev H.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable; forces device into Standby (SO = Hi-Z) when high; required for all operations. |
| SO/SIO1 | Serial Output / SDI/SQI Data Line | Outputs data in SPI mode; serves as second I/O in SDI; SIO1 in SQI; tri-states during HOLD. |
| SIO2 | SQI Data Line | Used only in SQI mode for 4-bit nibble transfers; must be tied to VSS or pulled up in SPI/SDI mode. |
| VSS | Ground Reference | Primary return path for all I/O and core logic; requires low-impedance connection to system GND plane. |
| SI/SIO0 | Serial Input / SDI/SQI Data Line | Accepts instructions/addresses/data in SPI mode; SIO0 in SDI/SQI; latched on SCK rising edge. |
| SCK | Serial Clock Input | Master-synchronized timing source; rising edge latches SI, falling edge updates SO. |
| HOLD/SIO3 | Hold Control / SQI Data Line | Pauses ongoing SPI transfer without resetting state; disabled in SQI mode (functions as SIO3). |
| VCC | Power Supply | 1.7V–2.2V nominal input; decoupling capacitor (0.1 µF) required within 5 mm of VCC/VSS pins. |
Key Features
| Feature | Design Value |
|---|---|
| Unlimited Read/Write Cycles | Enables continuous logging or buffer rotation without wear-out concerns - no endurance limit specified. |
| Zero Write Time | No internal write cycle delay; data written on CS high transition - eliminates wait states in time-critical firmware. |
| Three Operating Modes | Byte (single-byte), Page (32-byte burst), and Sequential (full-array) modes selectable via MODE register bits 7:6. |
| Multi-Interface Support | Hardware-compatible SPI, SDI (2-bit/clock), and SQI (4-bit/clock) modes - configurable via instruction set (EDIO/EQIO/RSTIO). |
| HOLD Functionality | Hardware pause/resume capability without retransmission - critical for deterministic interrupt handling in real-time systems. |
| Industrial Temp Range | Rated for −40°C to +85°C ambient - validated across full voltage and timing specs per DS20005155C. |
Applications
| Industrial Data Logger | Medical Sensor Hub |
|---|---|
Use Scenario: Continuous acquisition of analog sensor data (ECG, SpO₂) at 1 kHz with timestamping and local buffering before USB/Bluetooth upload. IC Role / Device Role / Timing Role: Volatile serial RAM providing low-latency, non-blocking write buffer between ADC controller and wireless subsystem. Use Value: 32-byte Page writes minimize firmware overhead; 20 MHz SPI enables sub-10 µs byte writes; 4 µA standby extends battery life during idle intervals. |
Use Scenario: Portable diagnostic device capturing multi-channel biosignals with real-time FFT preprocessing and temporary result storage. IC Role / Device Role / Timing Role: High-speed scratchpad memory for intermediate calculation results and FIFO staging prior to display or cloud sync. Use Value: Sequential mode allows seamless array traversal; 1.7V–2.2V operation matches Li-ion battery discharge curve; HOLD supports deterministic interrupt latency. |
| Automotive Body Controller | Smart Energy Meter |
Use Scenario: Storing door lock status, window position, mirror settings, and fault logs in a Class A automotive module with CAN/FlexRay host. IC Role / Device Role / Timing Role: Nonvolatile-configurable SRAM interfaced via MCU SPI peripheral for configuration persistence and event logging. Use Value: Industrial temp rating ensures reliability under hood conditions; zero write time prevents data loss during sudden power drops. |
Use Scenario: Utility meter recording voltage/current harmonics, tamper events, and tariff data every 15 minutes across 30-day rolling window. IC Role / Device Role / Timing Role: Low-power serial buffer holding compressed measurement packets until secure cellular transmission window opens. Use Value: 4 µA standby current minimizes self-consumption; 1.0 V data retention voltage supports supercapacitor backup hold-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 23LC512-I/ST | Wider VCC range (2.5V–5.5V); same pinout, timing, and feature set; not 1.8V compatible. | Preferred in 3.3V/5V systems; unsuitable for 1.8V-only designs due to 2.5V min VCC. | Select 23LC512-I/ST only if system VCC ≥2.5V and no 1.8V domain coexistence. |
| FM25V05-G | F-RAM technology; 2.0V–3.6V supply; 40 MHz SPI; 151 µA active current; unlimited endurance. | Eliminates write delays and wear concerns but draws higher active current; lacks SDI/SQI modes. | Choose FM25V05-G when deterministic zero-write-time is critical and higher active current is acceptable. |
Compared with 23LC512-I/ST, the 23A512T-I/ST enables 1.8V system integration and lower active power; versus FM25V05-G, it offers SDI/SQI bandwidth scaling and lower standby current, at the cost of conventional SRAM write-cycle discipline.
Availability
23A512T-I/ST is available at Aetrix Electronics and suitable for industrial data loggers, medical sensor hubs, automotive body controllers, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 23A512T-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 23A512T-I/ST belongs to Microchip's serial SRAM product line, engineered for low-voltage, high-reliability embedded systems requiring fast, flexible, and pin-efficient memory expansion beyond on-chip RAM.
FAQ
What is the operating voltage range for the 23A512T-I/ST?
The 23A512T-I/ST operates over 1.7V to 2.2V, making it suitable for 1.8V systems. This narrow range differs from the 23LC512's 2.5V–5.5V range and ensures compatibility with modern low-power microcontrollers without level-shifting circuitry. Operation outside this range may cause data corruption or failure to initialize.
Does the 23A512T-I/ST support Quad SPI (QSPI) mode?
Yes, the 23A512T-I/ST supports Serial Quad Interface (SQI) mode using SIO0–SIO3 pins, enabled by the EQIO command. However, SQI mode disables the HOLD function, and pin 3 (SIO2) must be actively driven - not left floating - during operation. Timing parameters differ from standard SPI and are specified in Table 1-2 of DS20005155C.
How does the HOLD function behave during active communication on the 23A512T-I/ST?
When HOLD is asserted low during an active SPI sequence (with CS low and SCK low), the 23A512T-I/ST immediately places SO in high-impedance and suspends further data transfer without resetting internal state. Communication resumes on the next SCK low-to-high transition after HOLD returns high. HOLD is unavailable in SQI mode.
What memory organization does the 23A512T-I/ST use, and how are addresses handled?
The 23A512T-I/ST implements a 64K × 8-bit organization (512 Kbit total), addressed via 16-bit addresses (0x0000–0xFFFF). In Page mode, the internal counter wraps at 32-byte boundaries; in Sequential mode, it rolls over from 0xFFFF to 0x0000. All instructions and data are transmitted MSB-first, as defined in Table 2-1.
Is the 23A512T-I/ST pin-compatible with other devices in the 23x512 family?
Yes, the 23A512T-I/ST shares identical 8-lead SOIC (ST) pinout, signal definitions, and timing with 23LC512-I/ST and 23A512-I/P. All variants use the same CS/SO/SI/SCK/HOLD/VSS/VCC/SIO2 pin mapping. However, voltage ranges and temperature grades differ - verify VCC and temp requirements before substitution.
23A512T-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:
- 512Kbit
- Memory Organization:
- 64K 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
23A512T-I/ST FAQ
1.How can I place an order for 23A512T-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 23A512T-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 23A512T-I/ST reliable?
The price and inventory of 23A512T-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 23A512T-I/ST is usually 5 days.
3.What payment methods are accepted for 23A512T-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 23A512T-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 23A512T-I/ST?
23A512T-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 23A512T-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 23A512T-I/ST?
For technical support, including 23A512T-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 23A512T-I/ST requirements.
6.How does Aetrix verify that 23A512T-I/ST is sourced from the original manufacturer or authorized distributors?
All 23A512T-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 23A512T-I/ST meets industry standards.
7.What is the process for return or replacement of 23A512T-I/ST?
All 23A512T-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 23A512T-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 23A512T-I/ST part is unused and in its original packaging.
Return procedure for 23A512T-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
23A512T-I/ST Tags
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