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

Microchip Technology 23K256T-I/ST

Name: 23K256T-I/ST
Brand: Microchip Technology
SKU: 23K256T-I/ST
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 23K256T-I/ST

Manufacturer:: Microchip Technology

Category:: Memory

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

Datasheet:: 23K256T-I/ST.pdf

Description:: IC SRAM 256KBIT SPI 20MHZ 8TSSOP

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Product details

Overview

23K256T-I/ST from Microchip Technology is a 256 Kbit (32,768 × 8-bit) low-power SPI Serial SRAM with 32-byte page architecture, 20 MHz max clock frequency, 3 mA read current at 1 MHz, and industrial temperature range (−40°C to +85°C). It operates from 2.7–3.6 V and integrates HOLD functionality for interrupt-safe bus arbitration in microcontroller-based data logging systems.

For engineers reviewing the 23K256T-I/ST datasheet, 23K256T-I/ST pinout, 23K256T-I/ST application, or 23K256T-I/ST equivalent, key selection criteria include SPI timing compliance (t_CSS, t_CSH, t_SU), standby current ≤4 µA at +85°C, V_CC operating range, HOLD pin behavior, and TSSOP-8 package compatibility with high-density PCB layouts.

Technical Context

The 23K256T-I/ST implements a true SPI-compatible serial interface with separate SI (data in) and SO (data out) lines, requiring only CS, SCK, SI, SO, HOLD, VCC, and VSS. Its internal 16-bit address pointer supports byte, page (32-byte), and sequential read/write modes controlled via STATUS register bits 7–6.

It features hardware HOLD functionality that places SO, SI, and SCK in high-impedance state while preserving internal state-enabling host MCU to service higher-priority interrupts without reinitializing the transaction. The device powers on in standby mode (CS = high) and requires no external write-enable signal.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	32,768 × 8-bit (256 Kbit); enables compact buffering of sensor logs or firmware patch storage without parallel bus overhead
Interface	SPI-compatible 4-wire (CS/SCK/SI/SO); interoperable with PIC® and ARM Cortex-M SPI peripherals without level-shifting
Max clock frequency	20 MHz at V_CC = 3.0 V (I-temp); supports ≥2.5 MB/s burst throughput for real-time telemetry capture
Read current	3 mA at 1 MHz, SO loaded; allows battery-powered operation with <10 µA average current in duty-cycled polling
Standby current	4 µA max at +85°C; ensures >10-year shelf life in energy-harvesting IoT nodes
V_CC range	2.7–3.6 V; matches standard 3.3 V LDO outputs and avoids need for auxiliary regulators
Data retention voltage	1.2 V min; guarantees RAM contents survive brown-out events down to backup-supply threshold

Pinout & Package

23K256T-I/ST is housed in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, JEDEC MO-153 compliant, footprint compatible with SOIC-8 but 35% smaller area and lower profile (1.2 mm height).

Pin/Terminal	Circuit Role	Design Meaning
1 CS	Chip Select Input	Active-low enable; drives SO to high-Z when deasserted, enabling multi-device SPI bus sharing
2 SO	Serial Data Output	Tri-states during HOLD or CS high; outputs MSB-first data on SCK falling edge
3 NC	No Connect	Internally unconnected; must remain floating or tied to GND per Microchip layout guidelines
4 VSS	Ground	Primary return path for all I/O and core logic; requires low-inductance connection to PCB ground plane
5 SI	Serial Data Input	Latches instruction/address/data on SCK rising edge; accepts 0.2×V_CC low-level threshold
6 SCK	Serial Clock Input	Edge-triggered master clock; rise/fall times ≤2 µs required for 20 MHz operation
7 HOLD	Hold Input	Pauses ongoing SPI transfer without resetting address counter; requires STATUS bit 0 = 0 to activate
8 VCC	Supply Voltage	2.7–3.6 V core supply; bypass capacitor (100 nF ceramic) mandatory within 5 mm of pin

Key Features

Feature	Design Value
Page write mode	32-byte atomic writes reduce firmware overhead by 97% vs. byte-by-byte programming in configuration storage
HOLD pin support	Enables deterministic interrupt latency (<100 ns resume time) without SPI transaction restart or address loss
Industrial temp range	−40°C to +85°C operation validated per AEC-Q200 stress profiles for factory automation controllers
Pb-free & RoHS	Halogen-free TSSOP package meets IPC-J-STD-020 moisture sensitivity level 3 (MSL3) for standard SMT assembly
Status register control	Software-selectable byte/page/sequential modes allow runtime optimization of bandwidth vs. memory coherency

Applications

Industrial Data Logger	Medical Sensor Hub
Use Scenario: Continuous acquisition of temperature, pressure, and humidity readings from multiple sensors at 100 Hz, with local buffering during wireless transmission gaps. IC Role / Device Role / Timing Role: SPI-accessible nonvolatile buffer providing 32 kB of fast-access scratchpad memory between ADC controller and BLE/Wi-Fi subsystem. Use Value: 32-byte page writes cut firmware ISR execution time by 60% vs. discrete byte writes, extending battery life in Class II medical devices.	Use Scenario: Real-time ECG waveform capture with 1 kHz sampling, requiring lossless short-term storage before compression and cloud upload. IC Role / Device Role / Timing Role: Low-latency serial SRAM acting as first-stage FIFO between analog front-end and ARM Cortex-M4 digital signal processor. Use Value: 20 MHz SPI clock supports 2.5 MB/s sustained read/write, eliminating bottlenecks during 10-second waveform bursts.
Automotive Telematics Unit	Smart Energy Meter
Use Scenario: Storing GPS position history, CAN bus diagnostic codes, and firmware update staging data in vehicles operating across −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Automotive-grade (E-temp variant available) serial memory interfacing directly with Infineon AURIX™ TC3xx SPI master. Use Value: 4 µA standby current at +85°C enables <5 µA system sleep current, meeting UNECE R100 battery drain requirements.	Use Scenario: Metering firmware storing tariff schedules, tamper-event timestamps, and harmonic analysis coefficients across power outage cycles. IC Role / Device Role / Timing Role: Retentive SRAM holding critical calibration and billing parameters during AC mains dropout, backed by supercapacitor. Use Value: 1.2 V data retention voltage ensures parameter integrity even when backup supply dips to 1.25 V during brownouts.

Industrial Data Logger

Medical Sensor Hub

Use Scenario: Continuous acquisition of temperature, pressure, and humidity readings from multiple sensors at 100 Hz, with local buffering during wireless transmission gaps.

IC Role / Device Role / Timing Role: SPI-accessible nonvolatile buffer providing 32 kB of fast-access scratchpad memory between ADC controller and BLE/Wi-Fi subsystem.

Use Value: 32-byte page writes cut firmware ISR execution time by 60% vs. discrete byte writes, extending battery life in Class II medical devices.

Use Scenario: Real-time ECG waveform capture with 1 kHz sampling, requiring lossless short-term storage before compression and cloud upload.

IC Role / Device Role / Timing Role: Low-latency serial SRAM acting as first-stage FIFO between analog front-end and ARM Cortex-M4 digital signal processor.

Use Value: 20 MHz SPI clock supports 2.5 MB/s sustained read/write, eliminating bottlenecks during 10-second waveform bursts.

Automotive Telematics Unit

Smart Energy Meter

Use Scenario: Storing GPS position history, CAN bus diagnostic codes, and firmware update staging data in vehicles operating across −40°C to +85°C ambient.

IC Role / Device Role / Timing Role: Automotive-grade (E-temp variant available) serial memory interfacing directly with Infineon AURIX™ TC3xx SPI master.

Use Value: 4 µA standby current at +85°C enables <5 µA system sleep current, meeting UNECE R100 battery drain requirements.

Use Scenario: Metering firmware storing tariff schedules, tamper-event timestamps, and harmonic analysis coefficients across power outage cycles.

IC Role / Device Role / Timing Role: Retentive SRAM holding critical calibration and billing parameters during AC mains dropout, backed by supercapacitor.

Use Value: 1.2 V data retention voltage ensures parameter integrity even when backup supply dips to 1.25 V during brownouts.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY14V104Q2-SXIT	4 Mbit density, NVSRAM with embedded lithium battery; 55 MHz SPI; 3.3 V only; larger 8-SOIC package	Requires battery management circuitry; suited for long-term nonvolatile storage without external backup caps	Select when data retention beyond 10 years is required without external energy storage components
IS25LP080D-JBLE	8 Mbit Quad SPI NOR Flash; 133 MHz QSPI; 1.8 V core; no HOLD pin; erase-before-write requirement	Not byte-addressable; requires sector erase (4 kB min); unsuitable for frequent small-data updates	Select only for firmware/image storage-not for dynamic data buffering or frequent write cycling

Compared with CY14V104Q2-SXIT and IS25LP080D-JBLE, the 23K256T-I/ST delivers optimal balance of low-power standby, deterministic HOLD response, and true byte-write capability-making it superior for high-cycle-count, interrupt-sensitive buffering where flash endurance or NVSRAM cost is prohibitive.

Availability

23K256T-I/ST is available at Aetrix Electronics and suitable for industrial data loggers, medical sensor hubs, automotive telematics units, and smart energy meters requiring stable component supply across extended product lifecycles.

Supply support for 23K256T-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 microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and development tools.

The 23K256T-I/ST belongs to Microchip's 23X256 family of SPI Serial SRAMs, designed specifically to replace parallel SRAMs in space-constrained, low-power embedded systems while maintaining full software compatibility with existing SPI drivers.

FAQ

What is the maximum SPI clock frequency supported by the 23K256T-I/ST?

The 23K256T-I/ST supports up to 20 MHz SPI clock frequency at V_CC = 3.0 V and industrial temperature range (−40°C to +85°C). At 1.5 V supply (23A256 variant), max clock drops to 10 MHz. Timing parameters including t_CSS, t_CSH, and t_SU are fully characterized across voltage and temperature for reliable high-speed operation of the 23K256T-I/ST.

Does the 23K256T-I/ST require external write protection or software initialization?

No, the 23K256T-I/ST has no hardware write-protect pin and does not require initialization. It powers on in standby mode (CS high) and enters active mode upon first CS low assertion. Write operations begin immediately after issuing the WRITE instruction (0x02) and 16-bit address-no status polling or enable sequence is needed for the 23K256T-I/ST.

How does the HOLD function behave during an active SPI transaction on the 23K256T-I/ST?

When HOLD is pulled low during an active SPI transaction, the 23K256T-I/ST tri-states SO, SI, and SCK while preserving the internal address pointer and command state. Communication resumes from the exact point of suspension when HOLD returns high (with SCK low). This behavior is enabled only if STATUS register bit 0 (HOLD enable) is set to '0'-a requirement explicitly documented for the 23K256T-I/ST.

What package type and footprint does the 23K256T-I/ST use?

The 23K256T-I/ST uses an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, JEDEC MO-153 compliant. Its footprint is identical to Microchip's SN (SOIC-8) variant but occupies 35% less board area and has 1.2 mm max height-critical for ultra-thin industrial HMI and portable medical devices using the 23K256T-I/ST.

Can the 23K256T-I/ST be used in automotive applications requiring AEC-Q200 qualification?

The 23K256T-I/ST is rated for industrial temperature (−40°C to +85°C) and is not AEC-Q200 qualified. However, Microchip offers the pin-compatible 23K256-E/ST variant rated for −40°C to +125°C with automotive-grade screening. For automotive designs, engineers must specify the E-temp version-not the I-temp 23K256T-I/ST-to meet AEC-Q200 requirements.

23K256T-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:: 256Kbit

Memory Organization:: 32K x 8

Memory Interface:: SPI

Clock Frequency:: 20 MHz

Write Cycle Time - Word, Page:: -

Access Time:: -

Voltage - Supply:: 2.7V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-TSSOP

23K256T-I/ST FAQ

1.How can I place an order for 23K256T-I/ST through Aetrix?

Please submit a Request for Quotation (RFQ) for 23K256T-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 23K256T-I/ST reliable?

The price and inventory of 23K256T-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 23K256T-I/ST is usually 5 days.

3.What payment methods are accepted for 23K256T-I/ST?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 23K256T-I/ST transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 23K256T-I/ST?

23K256T-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 23K256T-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 23K256T-I/ST?

For technical support, including 23K256T-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 23K256T-I/ST requirements.

6.How does Aetrix verify that 23K256T-I/ST is sourced from the original manufacturer or authorized distributors?

All 23K256T-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 23K256T-I/ST meets industry standards.

7.What is the process for return or replacement of 23K256T-I/ST?

All 23K256T-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 23K256T-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 23K256T-I/ST part is unused and in its original packaging.

Return procedure for 23K256T-I/ST:

1.Submit a request within 90 days.

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

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