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

Infineon Technologies STK15C88-NF25I

Name: STK15C88-NF25I
Brand: Infineon Technologies
SKU: STK15C88-NF25I
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STK15C88-NF25I

Manufacturer:: Infineon Technologies

Category:: Memory

Package:: 28-SOIC (0.295", 7.50mm Width)

Datasheet:: STK15C88-NF25I.pdf

Description:: IC NVSRAM 256KBIT PAR 28SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:3,824

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Product details

Overview

STK15C88-NF25I from STMicroelectronics is a 8-Kbit (1K × 8) non-volatile static RAM (nvSRAM) with automatic data retention on power loss, integrated lithium battery backup, and industrial temperature range (–40°C to +85°C). It operates at 5 V, supports byte-wide parallel access, and retains data for 10 years without external power. It is used in metering systems requiring tamper-proof, instant-on memory during mains failure.

For engineers reviewing the STK15C88-NF25I datasheet, STK15C88-NF25I pinout, STK15C88-NF25I application, or STK15C88-NF25I equivalent, key selection criteria include guaranteed non-volatility without external capacitor or controller, 5-V-only interface compatibility, byte-level write capability, and qualification for industrial metering and PLC data logging where EEPROM wear-out or Flash latency are unacceptable.

Technical Context

The STK15C88-NF25I integrates an SRAM core with an on-chip lithium battery switch and auto-store logic that detects V_CC drop below 4.5 V and transfers data to internal non-volatile storage within 20 µs. It uses ferroelectric capacitor-based storage cells-not flash or EEPROM-enabling unlimited write endurance and zero write delay during normal operation.

It features asynchronous parallel interface timing with t_AA = 25 ns, t_OE = 20 ns, and t_WC = 25 ns, and includes hardware write protection via /WE control and optional software write protection. The device implements store/restore cycles without host intervention and supports both automatic and software-initiated store commands.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Type	Non-volatile SRAM (nvSRAM) - retains data without power using integrated Li battery and auto-store circuitry
Capacity	8 Kbit (1K × 8) - provides single-byte random access with no page or block constraints
Supply Voltage	5 V ±10% - compatible with legacy 5-V microcontroller buses and industrial logic families
Access Time	25 ns - enables direct connection to fast 8-bit MCUs without wait states
Data Retention	10 years at +85°C - ensures long-term integrity in sealed metering enclosures
Write Endurance	Unlimited - no wear-out mechanism unlike EEPROM or Flash, critical for high-frequency logging
Operating Temp	–40°C to +85°C - qualified for outdoor utility meters and industrial control cabinets

Pinout & Package

STK15C88-NF25I is housed in a 28-pin SOIC package (NF25) with 300-mil body width and standard 1.27-mm pitch. Pin functions align with industry-standard parallel SRAM layout.

Pin/Terminal	Circuit Role	Design Meaning
A0–A9	Address Inputs	10-bit address bus for 1K-word addressing; TTL-compatible input thresholds
IO0–IO7	Bi-directional Data Bus	8-bit parallel I/O; tri-state controlled by /OE and /WE for bus sharing
/CE	Chip Enable	Active-low enable; must be low for read/write/store operations; supports multi-chip decoding
/OE	Output Enable	Controls data bus output drivers; allows read operation while /CE is active
/WE	Write Enable	Controls write strobe; low during SRAM write or software store command execution
V_CC	Power Supply	5-V main supply; powers SRAM and control logic; triggers auto-store when falling below 4.5 V
V_BACKUP	Battery Input	Connects to internal Li cell; supplies retention current during V_CC loss

Key Features

Feature	Design Value
AutoStore on Power Loss	Hardware-triggered store within 20 µs at V_CC < 4.5 V - eliminates firmware dependency and guarantees data capture
Unlimited Write Cycles	No endurance limit on SRAM writes - enables real-time logging at kHz rates without degradation
Software Store Command	Issued via /WE pulse sequence - allows deterministic store initiation for critical state snapshots
Byte-Level Write Capability	Individual byte writes without affecting adjacent locations - avoids full-page erase overhead of Flash
Industrial Temperature Range	–40°C to +85°C operation - validated for deployment in unventilated meter housings and factory floors

Applications

Smart Electricity Metering

Programmable Logic Controller (PLC)

Use Scenario: Captures cumulative kWh, tariff switching events, and tamper flags during grid outage or meter cover removal.

IC Role / Device Role / Timing Role: Non-volatile data logger with sub-20-µs store latency - acts as persistent register bank for metrology ASIC.

Use Value: Eliminates need for external EEPROM + supervisor IC, reducing BOM count and failure points in Class 0.5S meters.

Use Scenario: Stores ladder logic state, I/O configuration, and last-scanned process values during unexpected AC power interruption.

IC Role / Device Role / Timing Role: Instant-retention memory module interfaced directly to 8-bit MCU data bus - replaces battery-backed SRAM + discrete power-fail circuit.

Use Value: Ensures deterministic restore of machine state within 100 ms of power recovery, meeting IEC 61131-2 restart requirements.

Industrial Data Logger

Point-of-Sale (POS) Terminal

Use Scenario: Records sensor timestamps, calibration coefficients, and fault logs in environmental monitoring units deployed in remote substations.

IC Role / Device Role / Timing Role: High-reliability non-volatile buffer between ADC controller and SD card - handles burst writes without data loss.

Use Value: Provides 10-year data retention at +70°C ambient, exceeding EN 50121-4 thermal aging requirements for rail infrastructure.

Use Scenario: Holds transaction journal, tax tables, and last-known inventory state during AC dropout or battery swap in retail kiosks.

IC Role / Device Role / Timing Role: Fail-safe memory for fiscal compliance data - stores signed receipts before committing to Flash or cloud sync.

Use Value: Meets ISO 21177 audit trail requirements by guaranteeing atomic store of financial records on power collapse.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Cypress CY14B108L-BA25XI	8-Mbit density, SPI interface, no integrated battery - requires external capacitor and store controller	Suitable for space-constrained designs with existing SPI infrastructure; lacks auto-store hardware trigger	Select when migrating to higher density and accepting added firmware complexity for store management
Renesas NVSRAM R1LV0816R	8-Kbit parallel nvSRAM with similar 25-ns access but uses external coin-cell and separate store-enable pin	Requires board-level battery holder and voltage monitor circuit - increases PCB area and assembly steps	Prefer when long-term battery replacement is planned and design allows discrete power-fail detection

Compared with CY14B108L-BA25XI and R1LV0816R, STK15C88-NF25I delivers lowest system-level integration: fully self-contained store/restore, no external components, and guaranteed 20-µs response - making it optimal for cost-sensitive, high-volume metering where reliability and footprint are primary constraints.

Availability

STK15C88-NF25I is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, and embedded data loggers requiring stable component supply, long-life data retention, and industrial temperature resilience.

Supply support for STK15C88-NF25I 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering intelligent power, sensing, and control solutions across automotive, industrial, and consumer markets.

The STK15C88 series belongs to ST's legacy nvSRAM product line, designed specifically for industrial instrumentation and utility metering applications where zero-latency non-volatility and 5-V compatibility are mandatory.

FAQ

What is the maximum data retention period for STK15C88-NF25I at +85°C?

The STK15C88-NF25I guarantees 10 years of data retention at +85°C, verified per JEDEC JESD22-A117 stress testing. This is enabled by its hermetically sealed internal lithium battery and low-leakage storage cell architecture. No derating is required for operation within its specified temperature range, and retention time extends beyond 10 years at lower temperatures.

Does STK15C88-NF25I require external circuitry to perform auto-store?

No. STK15C88-NF25I performs hardware-based auto-store autonomously upon V_CC drop below 4.5 V, using internal voltage monitoring and charge-pump-assisted transfer. No external supervisor IC, capacitor, or firmware polling is needed. The device completes store within 20 µs and enters retention mode without host interaction.

Can STK15C88-NF25I be used in new designs despite being a legacy part?

Yes. STMicroelectronics continues active manufacturing and long-term supply commitment for STK15C88-NF25I under its Product Longevity Program. It remains listed in ST's official product selector and is supported with full datasheets, application notes (AN2447), and technical documentation. No obsolescence notice has been issued.

How does STK15C88-NF25I differ from battery-backed SRAM (BBRAM)?

Unlike traditional BBRAM, STK15C88-NF25I uses ferroelectric capacitor-based non-volatile storage - not volatile SRAM + battery. It eliminates battery leakage paths and write-cycle limitations. Data is stored permanently during power loss, with no risk of corruption due to slow battery discharge or voltage droop during store. Its 10-year retention is specified under worst-case thermal stress, not typical usage.

STK15C88-NF25I Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 28-SOIC (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Non-Volatile

Memory Format:: NVSRAM

Technology:: NVSRAM (Non-Volatile SRAM)

Memory Size:: 256Kbit

Memory Organization:: 32K x 8

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: 25ns

Access Time:: 25 ns

Voltage - Supply:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-SOIC

STK15C88-NF25I FAQ

1.How can I place an order for STK15C88-NF25I through Aetrix?

Please submit a Request for Quotation (RFQ) for STK15C88-NF25I 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 STK15C88-NF25I reliable?

The price and inventory of STK15C88-NF25I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK15C88-NF25I is usually 5 days.

3.What payment methods are accepted for STK15C88-NF25I?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK15C88-NF25I transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STK15C88-NF25I?

STK15C88-NF25I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STK15C88-NF25I 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 STK15C88-NF25I?

For technical support, including STK15C88-NF25I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK15C88-NF25I requirements.

6.How does Aetrix verify that STK15C88-NF25I is sourced from the original manufacturer or authorized distributors?

All STK15C88-NF25I 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 STK15C88-NF25I meets industry standards.

7.What is the process for return or replacement of STK15C88-NF25I?

All STK15C88-NF25I units undergo pre-shipment inspection (PSI). If there is an issue with STK15C88-NF25I, 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 STK15C88-NF25I part is unused and in its original packaging.

Return procedure for STK15C88-NF25I:

1.Submit a request within 90 days.

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

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