My Inquiry
My Account
Microchip Technology 23A256T-I/SN
- Part No.:
- 23A256T-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
23A256T-I/SN.pdf
- Description:
- IC SRAM 256KBIT SPI 20MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,906
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
23A256T-I/SN from Microchip Technology is a 256 Kbit (32,768 × 8-bit), 1.8 V serial SRAM with SPI interface, HOLD pin, and industrial temperature range (–40°C to +85°C). It supports byte/page/sequential read/write modes, delivers up to 20 MHz clock operation at 1.8 V, and draws only 3 mA active current at 1 MHz - ideal for low-power embedded systems requiring nonvolatile-adjacent fast-access memory.
For engineers reviewing the 23A256T-I/SN datasheet, 23A256T-I/SN pinout, 23A256T-I/SN application, or 23A256T-I/SN equivalent, key selection criteria include its 1.5–1.95 V supply range, 32-byte page size, HOLD functionality for interrupt-safe SPI pausing, and SOIC-8 (SN) tape-and-reel packaging compatible with automated assembly.
Technical Context
The 23A256T-I/SN implements a true SPI-compatible serial bus with separate SI (data in) and SO (data out) lines, synchronous to SCK rising/falling edges respectively. Its internal 16-bit address pointer supports automatic incrementing across byte, page (32-byte), or full-array sequential modes - controlled via two bits in a writable STATUS register.
It features a dedicated HOLD pin that places SO, SI, and SCK into 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 or reset signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8-bit) - provides sufficient buffer space for real-time data logging or firmware overlay in resource-constrained MCUs. |
| Supply Voltage | 1.5 V to 1.95 V - enables direct interfacing with 1.8 V logic families without level shifting. |
| Max Clock Frequency | 20 MHz at VCC = 1.8 V - supports high-throughput burst transfers (e.g., 32-byte page writes in ≤1.6 µs). |
| Standby Current | ≤4 µA at +85°C - ensures ultra-low quiescent power in battery-backed or energy-harvesting applications. |
| Page Size | 32 bytes - balances write efficiency and granularity for sensor buffering or protocol packet staging. |
| Data Retention Voltage | 1.2 V minimum - guarantees RAM data integrity during brown-out conditions down to near-threshold supply levels. |
| Operating Temperature | –40°C to +85°C (Industrial grade) - validated for deployment in industrial controllers, metering, and automotive body electronics. |
Pinout & Package
23A256T-I/SN is packaged in an 8-lead SOIC (3.90 mm body), designated by suffix "/SN", supplied in tape-and-reel format ("T") for SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable: drives device into active mode when low; forces SO to high-Z and enters standby when high. |
| SO | Serial Data Output | Tri-state output: delivers read data MSB-first on falling edge of SCK; enters high-Z when CS or HOLD is asserted. |
| VSS | Ground | Reference return path for all digital I/O and core logic; must be low-impedance connection to minimize noise coupling. |
| SI | Serial Data Input | Accepts instruction, address, and write data MSB-first on rising edge of SCK; ignored during HOLD assertion. |
| SCK | Serial Clock Input | Master-generated SPI clock: rising edge latches SI, falling edge updates SO; timing critical for AC compliance. |
| HOLD | Hold Input | Active-low pause control: suspends ongoing SPI transfer without resetting address pointer; requires STATUS bit enable. |
| VCC | Supply Voltage | 1.5–1.95 V core supply: powers SRAM array and interface logic; decoupling capacitor required per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| 32-byte page write mode | Enables efficient burst writes within page boundaries - reduces command overhead vs. byte-by-byte writes by 31×. |
| HOLD pin with state retention | Pauses SPI communication mid-transfer without losing address pointer or command context - eliminates re-synchronization logic. |
| Three configurable operation modes | Byte (default), Page, and Sequential modes selected via STATUS register - allows runtime optimization for access pattern. |
| Low-voltage 1.8 V operation | Matches modern ultra-low-power microcontrollers directly - avoids level-shifter cost, board area, and signal integrity risk. |
| Pb-free, RoHS-compliant, halogen-free | Meets global environmental compliance requirements for industrial and consumer end equipment without derating. |
Applications
| Industrial Data Logger | Smart Meter Communication Module |
|---|---|
|
Use Scenario: Captures timestamped sensor readings (temperature, pressure) during mains power loss using backup capacitor. IC Role / Device Role / Timing Role: Fast-access SRAM buffer holding last 5–10 seconds of data before safe EEPROM write. Use Value: 32-byte page writes complete in <1.6 µs at 20 MHz, minimizing backup power consumption; 4 µA standby extends hold-up time. |
Use Scenario: Stores encrypted AMI (Advanced Metering Infrastructure) payload fragments prior to RF transmission. IC Role / Device Role / Timing Role: SPI-connected temporary storage staging packets for sub-GHz transceiver with deterministic latency. Use Value: HOLD pin allows MCU to preempt SRAM access during RF interrupt servicing - no data loss or retry logic needed. |
| Medical Wearable Sensor Hub | PLC I/O Expansion Module |
|
Use Scenario: Aggregates raw accelerometer/ECG samples from multiple analog front-ends before Bluetooth LE upload. IC Role / Device Role / Timing Role: Low-voltage (1.8 V) serial buffer interfacing directly with Cortex-M0+ MCU GPIO-controlled SPI. Use Value: 1.5–1.95 V supply range eliminates level shifters; 3 mA read current at 1 MHz extends coin-cell battery life >20% vs. 3.3 V alternatives. |
Use Scenario: Caches fieldbus protocol frames (Modbus RTU, CANopen) between PLC CPU and isolated RS-485 transceivers. IC Role / Device Role / Timing Role: Dual-port-like behavior enabled by sequential read/write - supports concurrent CPU read and peripheral write. Use Value: 32,768 × 8-bit capacity accommodates full Modbus exception response buffers; industrial temp rating ensures reliability in cabinet environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY14V101QS-SXIT | 1 Mbit density, 2.5–3.6 V supply, NVSRAM with integrated lithium battery backup. | Used where data retention during indefinite power loss is mandatory - adds cost, size, and lifetime constraints. | Select when guaranteed nonvolatile retention >10 years is required; not drop-in due to voltage and pinout mismatch. |
| FM25V05-G | 512 Kbit F-RAM, 2.0–3.6 V, unlimited endurance, 40 MHz SPI, no write delay. | Preferred for high-write-cycle applications (e.g., event counters, wear-leveling buffers) where SRAM wear-out is a concern. | Choose for >10¹⁴ write cycles; differs in timing, status register map, and lacks HOLD pin - firmware adaptation required. |
Compared with CY14V101QS-SXIT and FM25V05-G, the 23A256T-I/SN offers optimal balance of low-voltage operation, predictable timing, and minimal system integration effort for cost-sensitive industrial designs where battery-free short-term data buffering suffices.
Availability
23A256T-I/SN is available at Aetrix Electronics and suitable for industrial data loggers, smart meter communication modules, and medical wearable sensor hubs requiring stable component supply across multi-year production cycles.
Supply support for 23A256T-I/SN 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 industrial, automotive, consumer, and communications markets with vertically integrated silicon and development tools.
The 23A256T-I/SN belongs to Microchip's serial SRAM product line, designed specifically for low-voltage, low-power embedded systems needing SPI-compatible fast-access memory without battery backup or complex initialization sequences.
FAQ
What is the maximum clock frequency supported by the 23A256T-I/SN at 1.8 V?
The 23A256T-I/SN supports up to 20 MHz clock frequency when operated at VCC = 1.8 V and TA = –40°C to +85°C. This is specified in Table 1-2 (AC Characteristics) of DS22100F, with timing parameters validated under industrial temperature conditions. Performance degrades at lower voltages: max clock drops to 16 MHz at 1.5 V.
Does the 23A256T-I/SN require external hardware for write protection?
No, the 23A256T-I/SN does not include hardware write-protect pins. Write enable is controlled solely by the SPI command sequence - a valid WRITE instruction (0x02) followed by address and data initiates write. The STATUS register has no write-protect bit; protection must be implemented in firmware by restricting command issuance.
How does the HOLD function interact with the STATUS register on the 23A256T-I/SN?
The HOLD function on the 23A256T-I/SN is disabled unless the HOLD bit (bit 0) in the STATUS register is cleared to '0'. When set to '1', the HOLD pin is ignored. This configuration is retained across power cycles. Thus, proper initialization of the STATUS register is required before asserting HOLD to pause an ongoing SPI transaction.
What package type and packaging format does the 23A256T-I/SN use?
The 23A256T-I/SN uses an 8-lead SOIC package (3.90 mm body width), indicated by the "/SN" suffix, and is supplied in tape-and-reel format, denoted by the "T" prefix. This matches Microchip's standard SOIC-8 footprint and is compatible with automated SMT placement equipment.
Is the 23A256T-I/SN pin-compatible with the 23K256 series?
No, the 23A256T-I/SN is not pin-compatible with the 23K256 series despite identical pin count and function mapping. The 23K256 operates at 2.7–3.6 V and has different AC timing specifications, input thresholds (VIH/VIL), and standby current behavior. Interchangeability would require voltage translation and firmware timing validation - not recommended without full electrical requalification.
23A256T-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- 1.7V ~ 1.95V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
23A256T-I/SN FAQ
1.How can I place an order for 23A256T-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 23A256T-I/SN 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 23A256T-I/SN reliable?
The price and inventory of 23A256T-I/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 23A256T-I/SN is usually 5 days.
3.What payment methods are accepted for 23A256T-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 23A256T-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 23A256T-I/SN?
23A256T-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 23A256T-I/SN 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 23A256T-I/SN?
For technical support, including 23A256T-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 23A256T-I/SN requirements.
6.How does Aetrix verify that 23A256T-I/SN is sourced from the original manufacturer or authorized distributors?
All 23A256T-I/SN 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 23A256T-I/SN meets industry standards.
7.What is the process for return or replacement of 23A256T-I/SN?
All 23A256T-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 23A256T-I/SN, 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 23A256T-I/SN part is unused and in its original packaging.
Return procedure for 23A256T-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
23A256T-I/SN Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
