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Microchip Technology 23A512T-E/ST
- Part No.:
- 23A512T-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
23A512T-E/ST.pdf
- Description:
- IC SRAM 512KBIT SPI/QUAD 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,289
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Product details
Overview
23A512T-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 5.5V/20 MHz, 4 µA standby current at +85°C, and 64K × 8-bit organization with 32-byte page size - used for real-time data buffering in automotive engine control units.
For engineers reviewing the 23A512T-E/ST datasheet, 23A512T-E/ST pinout, 23A512T-E/ST application, or 23A512T-E/ST equivalent, key selection considerations include its dual/quad I/O capability, low-voltage operation, extended temperature support, and compatibility with PIC® MCU SPI peripherals in space-constrained embedded systems.
Technical Context
The 23A512T-E/ST implements a serial SRAM architecture with three configurable access modes-Byte, Page, and Sequential-controlled via a writable MODE register. It supports standard SPI (single I/O), SDI (dual I/O), and SQI (quad I/O) protocols using shared SIO pins, enabling scalable bandwidth without changing physical layout.
Its timing-critical functions-including HOLD suspension, CS setup/hold/disable, and output valid/hold windows-are fully specified across both I-temp and E-temp ranges. The device powers on in Standby mode and requires CS low-to-high transition to initiate active communication, with all instructions (READ, WRITE, RDMR, WRMR, EDIO, EQIO, RSTIO) transferred MSB-first.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.7V–2.2V - enables integration into ultra-low-power 1.8V system rails with margin for voltage droop |
| Memory Organization | 64K × 8-bit (512 Kbit) - provides sufficient buffer depth for sensor fusion or CAN message queuing |
| Max Clock Frequency | 20 MHz (I-temp), 16 MHz (E-temp) - supports high-throughput logging at ≤50 ns cycle time |
| 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 minimal battery drain during MCU sleep in always-on automotive modules |
| Page Size | 32 bytes - aligns with typical CAN FD frame payload and simplifies firmware page management |
| Data Retention Voltage | 1.0 V - guarantees RAM contents survive brown-out events down to 1.0V before power loss |
Pinout & Package
23A512T-E/ST is packaged in an 8-lead SOIC (SN) with 3.90 mm body width, JEDEC-standard footprint, and RoHS-compliant matte tin plating. Pin 1 is marked by notch or bevel; package meets IPC-7351B land pattern recommendations (X1 = 1.55 mm, Y1 = 0.60 mm, pitch = 1.27 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable; forces SO to high-impedance when deasserted, enabling multi-device SPI bus sharing |
| SO/SIO1 | Serial Output / SDI/SQI Data Line | Tri-state output in SPI mode; bidirectional in SDI/SQI; requires external pull-up only if shared with other devices |
| SIO2 | SQI Data Line | Dedicated quad-mode input/output; must not float in SPI/SDI mode per datasheet Note on page 13 |
| VSS | Ground Reference | Primary return path for all I/O and core logic; requires low-inductance connection to PCB ground plane |
| SI/SIO0 | Serial Input / SDI/SQI Data Line | Input-only in SPI mode; bidirectional in SDI/SQI; latches data on SCK rising edge |
| SCK | Serial Clock Input | Asynchronous master clock; rising edge clocks SI, falling edge updates SO; max 20 MHz |
| HOLD/SIO3 | Hold Control / SQI Data Line | Suspends ongoing transfer without resetting address pointer; disabled in SQI mode per Section 3.5 |
| VCC | Power Supply | 1.7V–2.2V analog/digital rail; requires local 100 nF ceramic decoupling within 5 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Unlimited Read/Write Cycles | Enables continuous data logging in telemetry systems without wear-out concerns over product lifetime |
| Zero Write Time | Eliminates wait states after write commands - critical for deterministic response in real-time control loops |
| SDI & SQI Interface Support | Doubles or quadruples effective throughput vs. standard SPI, reducing host CPU overhead in high-bandwidth sensor arrays |
| Three Access Modes (Byte/Page/Sequential) | Allows firmware to optimize for latency (Byte), burst efficiency (Page), or streaming (Sequential) without hardware change |
| Extended Temperature Range (–40°C to +125°C) | Validated for under-hood automotive applications where ambient thermal stress exceeds industrial limits |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Data Logger |
|---|---|
Use Scenario: Real-time storage of misfire counters, knock sensor samples, and OBD-II diagnostic snapshots between CAN message transmissions. IC Role / Device Role / Timing Role: High-speed, non-volatile-equivalent buffer interfacing directly with PIC18F66K80 SPI port at 20 MHz. Use Value: 32-byte page writes align with CAN FD frame payloads; 4 µA standby current extends battery life during vehicle ignition-off periods. | Use Scenario: Local buffering of analog input samples from 16-channel 12-bit ADC before Ethernet upload to SCADA server. IC Role / Device Role / Timing Role: SPI slave memory co-located with ARM Cortex-M4 MCU; accessed in Sequential mode for continuous streaming. Use Value: 20 MHz clock rate sustains ≥2.5 MB/s effective throughput; E-temp rating ensures reliability inside sealed IP67 enclosures. |
| Medical Infusion Pump Controller | Railway Signaling Module |
Use Scenario: Storing dose history, alarm logs, and calibration coefficients with guaranteed retention during brief AC power interruptions. IC Role / Device Role / Timing Role: Low-voltage (1.8V) SRAM paired with safety-certified microcontroller; powered from backup supercapacitor. Use Value: 1.0 V data retention voltage allows >100 ms hold-up time; unlimited cycles prevent field failures from frequent log updates. | Use Scenario: Temporary storage of track occupancy status and signal aspect transitions in EN 5012x-compliant signaling nodes. IC Role / Device Role / Timing Role: Dual-redundant SRAM bank accessed via isolated SPI isolators; operated in Page mode for deterministic write latency. Use Value: –40°C to +125°C rating meets EN 50121-3-2 ambient requirements; RoHS compliance satisfies EU railway procurement mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 23LC512T-E/ST | 2.5V–5.5V VCC range; identical pinout and instruction set; same SDI/SQI features | Requires higher supply voltage; unsuitable for 1.8V-only systems but offers better noise immunity in noisy industrial environments | Select when system rail is ≥2.5V and higher VCC noise margin is prioritized over ultra-low-power operation |
| 23K256-I/SN | 256 Kbit density (32K × 8); 1.7V–3.6V VCC; no SQI support; 10 MHz max clock | Lacks quad I/O and extended temperature grade; limited to Industrial temp only (–40°C to +85°C) | Choose for cost-sensitive designs where 256 Kbit capacity suffices and SQI bandwidth is unnecessary |
Compared with 23LC512T-E/ST and 23K256-I/SN, the 23A512T-E/ST uniquely balances 1.8V compatibility, E-temp operation, and quad-speed interface - making it the only option among the three qualified for automotive under-hood use with high-bandwidth logging requirements.
Availability
23A512T-E/ST is available at Aetrix Electronics and suitable for automotive ECU development, industrial data acquisition systems, and medical device manufacturing requiring stable component supply across long production lifecycles.
Supply support for 23A512T-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 microcontrollers, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 23A512/23LC512 family was designed specifically for high-reliability, low-voltage serial memory applications in automotive, industrial, and medical systems demanding extended temperature operation and flexible I/O protocols.
FAQ
What is the maximum clock frequency supported by the 23A512T-E/ST in Extended temperature range?
The 23A512T-E/ST supports a maximum clock frequency of 16 MHz when operating across the Extended temperature range (–40°C to +125°C), as explicitly specified in Table 1-2 of the DS20005155C datasheet. This derating ensures timing margins are maintained under worst-case thermal and voltage conditions, unlike the 20 MHz rating valid only for Industrial temperature range.
Does the 23A512T-E/ST support Quad SPI (SQI) mode, and what happens to the HOLD function in that mode?
Yes, the 23A512T-E/ST supports SQI mode via the EQIO command. However, per Section 3.5 and Figure 3-3 of the datasheet, the HOLD function is disabled in SQI mode because the HOLD/SIO3 pin is repurposed as a dedicated SQI data line. Attempting to assert HOLD during SQI operation has no effect and may cause communication errors.
What is the meaning of "T-E/ST" in the part number 23A512T-E/ST?
In 23A512T-E/ST, "T" denotes tape-and-reel packaging, "E" specifies Extended temperature grade (–40°C to +125°C), and "ST" identifies the 8-lead SOIC (Small Outline Integrated Circuit) package per Microchip's standard marking convention in Section 5.1 of DS20005155C.
Can the 23A512T-E/ST retain data during a power failure, and down to what voltage?
Yes, the 23A512T-E/ST guarantees data retention down to 1.0 V (VDR parameter, Table 1-1), meaning RAM contents remain intact even as VCC drops during brown-out events - provided the voltage does not fall below this threshold before backup power or system shutdown completes.
Is the 23A512T-E/ST pin-compatible with the 23LC512T-E/ST, and can they be substituted on the same PCB?
Yes, the 23A512T-E/ST and 23LC512T-E/ST share identical 8-lead SOIC (ST) packaging, pinout, and instruction set. They differ only in VCC range (1.7V–2.2V vs. 2.5V–5.5V) and associated DC/AC specs. Substitution is electrically safe if the target board's supply voltage falls within both ranges; however, 23A512T-E/ST must not be used on 5V-only boards.
23A512T-E/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:
- 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
23A512T-E/ST FAQ
1.How can I place an order for 23A512T-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 23A512T-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 23A512T-E/ST reliable?
The price and inventory of 23A512T-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 23A512T-E/ST is usually 5 days.
3.What payment methods are accepted for 23A512T-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 23A512T-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 23A512T-E/ST?
23A512T-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 23A512T-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 23A512T-E/ST?
For technical support, including 23A512T-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 23A512T-E/ST requirements.
6.How does Aetrix verify that 23A512T-E/ST is sourced from the original manufacturer or authorized distributors?
All 23A512T-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 23A512T-E/ST meets industry standards.
7.What is the process for return or replacement of 23A512T-E/ST?
All 23A512T-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 23A512T-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 23A512T-E/ST part is unused and in its original packaging.
Return procedure for 23A512T-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
23A512T-E/ST Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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