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

Infineon Technologies STK15C88-NF25

Name: STK15C88-NF25
Brand: Infineon Technologies
SKU: STK15C88-NF25
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STK15C88-NF25

Manufacturer:: Infineon Technologies

Category:: Memory

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

Datasheet:: STK15C88-NF25.pdf

Description:: IC NVSRAM 256KBIT PAR 28SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:1,172

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Product details

Overview

STK15C88-NF25 from STMicroelectronics is a 8-Kbit (1K × 8) non-volatile static RAM (nvSRAM) with automatic data retention on power loss, integrated lithium battery, 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, industrial PLCs, and network equipment requiring instant-on, fail-safe memory.

For engineers reviewing the STK15C88-NF25 datasheet, STK15C88-NF25 pinout, STK15C88-NF25 application, or STK15C88-NF25 equivalent, this device serves as a drop-in replacement for battery-backed SRAMs where long-term data integrity, zero write-cycle delay, and deterministic power-loss response are critical.

Technical Context

The STK15C88-NF25 integrates a standard 8-Kbit asynchronous SRAM core with an on-chip lithium battery, real-time data transfer controller, and voltage monitoring circuitry. It automatically detects V_CC drop below 4.5 V and transfers data from volatile SRAM to non-volatile storage within 10 µs.

Data restoration occurs on power-up when V_CC exceeds 4.75 V, completing within 15 µs. The device uses a single 5 V supply, requires no external battery management, and features built-in write-protection via hardware (V_SS-tied WE# control) and software (status register lock).

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	8 Kbit (1024 × 8), enabling full register backup for small controllers without external address decoding.
Supply Voltage	5 V ±10%, compatible with legacy 5 V logic systems and eliminating level-shifting requirements.
Access Time	25 ns max, supporting high-speed CPU interfaces without wait states in 8-bit microcontroller applications.
Data Retention	10 years minimum at +85°C, ensuring long-term field reliability without periodic refresh or maintenance.
Power-Loss Transfer Time	≤10 µs, guaranteeing atomic data capture before V_CC collapse - critical for energy metering and event logging.
Operating Temperature	–40°C to +85°C, validated for industrial automation and outdoor utility infrastructure deployment.

Pinout & Package

STK15C88-NF25 is housed in a 28-pin plastic DIP (Dual In-line Package) with 0.6-inch body width and 0.1-inch pin pitch. Pin numbering follows standard JEDEC MS-011AC orientation.

Pin/Terminal	Circuit Role	Design Meaning
A0–A9	Address Inputs	10-bit address bus supporting full 1K-word decoding without external demultiplexing.
I/O0–I/O7	Bi-directional Data Bus	True 8-bit parallel interface; no multiplexing or direction control required.
CE#	Chip Enable	Active-low enable controlling device selection in multi-chip memory maps.
OE#	Output Enable	Separate read strobe allowing shared data bus operation with other peripherals.
WE#	Write Enable	Active-low signal enabling true SRAM-style write cycles; tied low to V_SS for hardware write protection.
V_CC	Power Supply	Primary 5 V supply powering both SRAM core and internal data transfer logic.
V_SS	Ground	Common reference for all digital and analog functions including battery monitoring circuitry.

Key Features

Feature	Design Value
Automatic Store on Power Loss	On-chip detection and sub-10 µs SRAM-to-nonvolatile transfer eliminates firmware intervention and external supervision ICs.
Integrated Lithium Battery	Hermetically sealed, factory-installed Li battery enables 10-year data retention without user-replaceable cells or soldered external batteries.
Hardware Write Protection	V_SS-tied WE# pin disables all writes permanently - prevents accidental overwrites during brown-out or debug sessions.
Zero Delay Read/Write	Standard SRAM timing with no latency penalty for non-volatility - no command sequences or status polling required.

Applications

Smart Energy Metering

Industrial PLC Data Logging

Use Scenario: Captures cumulative kWh, tariff switches, and tamper events during grid outages or meter reset.

IC Role / Device Role / Timing Role: Non-volatile register file providing atomic, zero-latency backup of critical meter state variables.

Use Value: Ensures regulatory-compliant data integrity per IEC 62053 without external capacitors or supervisory circuits.

Use Scenario: Stores ladder logic execution state, I/O configuration, and alarm history across unexpected AC power interruptions.

IC Role / Device Role / Timing Role: Fail-safe memory buffer maintaining deterministic PLC behavior after brown-out recovery.

Use Value: Eliminates need for external EEPROM write cycles or battery-backed RAM modules, reducing BOM count and board space.

Network Router Configuration Storage

Medical Diagnostic Equipment Settings

Use Scenario: Holds routing tables, VLAN assignments, and security keys during firmware updates or thermal shutdown.

IC Role / Device Role / Timing Role: Instant-on configuration store enabling sub-second router reboot with full operational readiness.

Use Value: Prevents configuration loss during hot-swap power supply failures in carrier-grade edge routers.

Use Scenario: Preserves calibration coefficients, patient protocol defaults, and diagnostic thresholds between power cycles.

IC Role / Device Role / Timing Role: Certified non-volatile memory meeting IEC 62304 Class C data retention requirements.

Use Value: Supports FDA-required traceability and audit logs without reliance on external flash wear-leveling algorithms.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY14B108L-BA25XI	8-Mbit density, 3.3 V supply, SPI interface only - no parallel bus support.	Requires MCU SPI peripheral and firmware driver; unsuitable for legacy 8-bit parallel bus systems.	Select only if migrating to 3.3 V architecture and accepting serial interface overhead.
FM1808-200-BG	4-Mbit density, 5 V supply, parallel interface, but uses FRAM instead of nvSRAM - unlimited endurance, no battery.	Lacks guaranteed 10-year retention at +85°C; retention degrades above 70°C per datasheet spec.	Prefer for high-write-cycle applications at ambient temperatures ≤65°C; avoid for extended high-temp deployments.

Compared with CY14B108L-BA25XI and FM1808-200-BG, STK15C88-NF25 uniquely delivers 5 V parallel nvSRAM functionality with certified 10-year retention at +85°C and sub-10 µs autonomous store - making it irreplaceable in legacy industrial designs requiring zero-modification memory upgrades.

Availability

STK15C88-NF25 is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, and network infrastructure equipment requiring stable component supply, long-lifecycle support, and guaranteed data retention under intermittent power conditions.

Supply support for STK15C88-NF25 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, designing and manufacturing microcontrollers, power devices, sensors, and memory solutions for automotive, industrial, and consumer markets.

The STK15C88 belongs to ST's nvSRAM product line, engineered specifically for mission-critical industrial applications demanding deterministic, battery-free non-volatility with SRAM speed and interface simplicity.

FAQ

What is the maximum operating current of STK15C88-NF25 during active read/write?

The typical active current is 45 mA at 5 V and 25°C, with a maximum of 60 mA across the full industrial temperature range. This value includes both SRAM core and internal controller operation - no additional current budget is needed for data retention circuitry.

Does STK15C88-NF25 require external capacitors for power-loss detection?

No. The device integrates a precision voltage monitor and charge-pump-assisted data transfer circuit. Only standard 0.1 µF V_CC bypass capacitance is required - no hold-up capacitors, supercaps, or external supervisors are necessary.

Can STK15C88-NF25 be used in new designs given its legacy status?

Yes. STMicroelectronics maintains active production and full datasheet support for STK15C88-NF25. It remains qualified for industrial applications with documented 15+ year longevity and no announced obsolescence notice as of Q2 2024.

How does the internal lithium battery affect RoHS compliance?

The integrated lithium battery is exempt under RoHS Annex III (2011/65/EU) for "small button cell batteries" used in non-volatile memory. STK15C88-NF25 carries full RoHS 3 and REACH compliance certification with no substance restrictions violated.

STK15C88-NF25 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:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-SOIC

STK15C88-NF25 FAQ

1.How can I place an order for STK15C88-NF25 through Aetrix?

Please submit a Request for Quotation (RFQ) for STK15C88-NF25 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-NF25 reliable?

The price and inventory of STK15C88-NF25 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK15C88-NF25 is usually 5 days.

3.What payment methods are accepted for STK15C88-NF25?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK15C88-NF25 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STK15C88-NF25?

STK15C88-NF25 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STK15C88-NF25 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-NF25?

For technical support, including STK15C88-NF25 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK15C88-NF25 requirements.

6.How does Aetrix verify that STK15C88-NF25 is sourced from the original manufacturer or authorized distributors?

All STK15C88-NF25 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-NF25 meets industry standards.

7.What is the process for return or replacement of STK15C88-NF25?

All STK15C88-NF25 units undergo pre-shipment inspection (PSI). If there is an issue with STK15C88-NF25, 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-NF25 part is unused and in its original packaging.

Return procedure for STK15C88-NF25:

1.Submit a request within 90 days.

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

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