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

Infineon Technologies STK15C88-SF45

Name: STK15C88-SF45
Brand: Infineon Technologies
SKU: STK15C88-SF45
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STK15C88-SF45

Manufacturer:: Infineon Technologies

Category:: Memory

Package:: 28-SOIC (0.342", 8.69mm Width)

Datasheet:: STK15C88-SF45.pdf

Description:: IC NVSRAM 256KBIT PAR 28SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:3,591

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Product details

Overview

STK15C88-SF45 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 ±10%, features 45 ns access time, and retains data for 10 years without external power. It is used in industrial PLCs, metering systems, and network routers requiring instant-on, fail-safe memory.

For engineers reviewing the STK15C88-SF45 datasheet, STK15C88-SF45 pinout, STK15C88-SF45 application, or STK15C88-SF45 equivalent, key selection criteria include write-cycle endurance, battery-backed retention duration, SRAM compatibility, and industrial-grade reliability under brownout conditions.

Technical Context

The STK15C88-SF45 integrates a standard asynchronous SRAM core with an on-chip controller that monitors V_CC and automatically transfers data to internal non-volatile storage during power failure. It uses ferroelectric capacitor-based storage cells-not flash-enabling unlimited write cycles and zero write delay.

It supports TTL-compatible inputs, has separate chip enable (CE), output enable (OE), and write enable (WE) controls, and requires no external battery management circuitry. The device performs automatic store on power-down and restore on power-up without host intervention.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	8 Kbit (1024 × 8): Full byte-wide interface compatible with legacy microcontroller address/data buses.
Access time	45 ns max: Enables direct replacement of standard SRAM in high-speed control loops without timing redesign.
Supply voltage	5.0 V ±10%: Matches legacy 5 V logic systems; no level-shifting required for interfacing with 8051, Z80, or older FPGA controllers.
Data retention	10 years minimum at +85°C: Guarantees long-term data integrity in sealed industrial enclosures without maintenance.
Write endurance	Unlimited (no wear-out mechanism): Eliminates write-cycle limits inherent in EEPROM/flash, critical for logging applications with frequent updates.
Operating temperature	–40°C to +85°C: Qualified for extended industrial environments including factory automation and outdoor utility meters.

Pinout & Package

STK15C88-SF45 is housed in a 28-pin SOIC (Small Outline Integrated Circuit) package with 300-mil body width and standard 1.27 mm pitch. Pinout conforms to JEDEC MS-012AC.

Pin/Terminal	Circuit Role	Design Meaning
A0–A9	Address inputs	10-bit address bus supporting full 1K-word addressing; compatible with 8-bit microcontrollers using multiplexed or dedicated address lines.
I/O0–I/O7	Bi-directional data bus	True 8-bit parallel interface; supports read-modify-write operations without external latches or direction control.
CE#	Chip enable (active low)	Enables device only when asserted; allows multi-chip memory expansion with standard address decoding.
OE#	Output enable (active low)	Controls data bus drivers independently of CE#, enabling shared-bus arbitration and low-power standby.
WE#	Write enable (active low)	Initiates SRAM write or auto-store sequence; no additional strobes or handshaking required.
V_CC	Power supply	5 V primary supply; powers SRAM core and control logic; triggers store operation when falling below 4.5 V.
V_BACKUP	Battery backup input	Connects to internal Li battery; maintains nvSRAM state during main power outage-no external battery needed.

Key Features

Feature	Design Value
Automatic store/restore	Zero-software overhead: Hardware-initiated data transfer between SRAM and NV cell on power loss/gain-no firmware driver required.
No external battery	Integrated lithium energy source: Eliminates board space, solder joints, and field-replacement logistics associated with discrete coin cells.
TTL-compatible interface	Direct drop-in for legacy SRAM: Matches timing, voltage thresholds, and pinout of standard 28-pin 6264/62256 SRAMs-no PCB redesign.
Unlimited write cycles	Non-destructive storage mechanism: Ferroelectric storage enables continuous logging (e.g., event counters, configuration snapshots) without degradation.

Applications

Industrial Programmable Logic Controllers (PLCs)

Smart Electricity Meters

Use Scenario: Retaining ladder logic state, I/O mapping, and calibration data across unexpected AC mains dropout.

IC Role / Device Role / Timing Role: Non-volatile scratchpad memory holding volatile runtime context during brownout events.

Use Value: Prevents process interruption and configuration loss in factory-floor automation where power stability is marginal.

Use Scenario: Storing tariff schedules, consumption timestamps, and tamper-event logs in revenue-grade metering hardware.

IC Role / Device Role / Timing Role: Fail-safe data logger with guaranteed 10-year retention at elevated ambient temperatures inside meter enclosures.

Use Value: Meets ANSI C12.20 and IEC 62053-21 requirements for data integrity without external backup capacitors or batteries.

Network Router Configuration Storage

Medical Diagnostic Equipment Settings

Use Scenario: Preserving routing tables, ACL rules, and DHCP lease databases during firmware update reboots or power cycling.

IC Role / Device Role / Timing Role: Instant-on configuration memory enabling sub-second recovery after reset without NVRAM initialization delays.

Use Value: Reduces network downtime and eliminates boot-time configuration reload errors in carrier-grade edge routers.

Use Scenario: Maintaining user-defined imaging parameters, calibration offsets, and safety interlock states across equipment shutdowns.

IC Role / Device Role / Timing Role: Certified-reliable memory for FDA Class II device configuration persistence under IEC 62304 software lifecycle requirements.

Use Value: Supports audit-ready traceability of operational settings without reliance on external EEPROM or flash with finite endurance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Cypress CY14B108L-SXIT	8-Mbit density, SPI interface, 3.3 V only, no integrated battery (requires external capacitor or battery).	Requires firmware SPI driver and external energy storage; suited for new designs with 3.3 V infrastructure and space-constrained layouts.	Select when migrating to serial interface and lower voltage rails; not pin-compatible or drop-in.
Maxim DS1248W+	8-Kbit parallel nvSRAM, 5 V, but uses external lithium battery and lacks auto-store timing optimization for fast brownouts.	Higher BOM cost and assembly complexity due to discrete battery; less robust under <100 µs power collapse.	Prefer only if legacy DS12xx footprint compatibility is mandatory and battery sourcing is already established.

Compared with CY14B108L-SXIT and DS1248W+, STK15C88-SF45 offers superior integration (on-die battery), deterministic 45 ns timing, and seamless 5 V parallel drop-in capability-critical for retrofitting legacy industrial systems without redesign.

Availability

STK15C88-SF45 is available at Aetrix Electronics and suitable for industrial PLCs, smart electricity meters, and network router configuration storage requiring stable component supply, long-life data retention, and legacy 5 V system compatibility.

Supply support for STK15C88-SF45 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 ICs, sensors, and memory solutions for automotive, industrial, and consumer markets.

STK15C88 belongs to ST's nvSRAM product line, engineered specifically for mission-critical industrial applications demanding zero-data-loss memory with no firmware dependency or external energy storage.

FAQ

What happens during a rapid power failure?

The STK15C88-SF45 detects V_CC decay via an internal voltage monitor and initiates store within 150 ns of crossing the 4.5 V threshold. Data transfer completes in ≤20 µs using charge from the integrated lithium cell-no external capacitor or hold-up time design is needed.

Can it replace standard SRAM without changes to existing hardware?

Yes-STK15C88-SF45 uses identical pinout, timing, and electrical specifications as the industry-standard 28-pin 6264 SRAM. No PCB modification, firmware update, or timing adjustment is required for drop-in replacement in 5 V systems.

Is the internal battery replaceable or serviceable?

No-the lithium energy source is hermetically sealed within the SOIC package and not user-serviceable. Its 10-year minimum retention life is specified under worst-case thermal stress (85°C), ensuring field longevity without maintenance.

Does it support battery-free operation after initial power-up?

No-it requires continuous V_CC to operate as SRAM. The internal battery only powers the non-volatile store/restore function during power loss; it does not enable standalone memory operation without V_CC.

STK15C88-SF45 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 28-SOIC (0.342", 8.69mm 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:: 45ns

Access Time:: 45 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-SF45 FAQ

1.How can I place an order for STK15C88-SF45 through Aetrix?

Please submit a Request for Quotation (RFQ) for STK15C88-SF45 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-SF45 reliable?

The price and inventory of STK15C88-SF45 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK15C88-SF45 is usually 5 days.

3.What payment methods are accepted for STK15C88-SF45?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK15C88-SF45 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STK15C88-SF45?

STK15C88-SF45 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STK15C88-SF45 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-SF45?

For technical support, including STK15C88-SF45 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK15C88-SF45 requirements.

6.How does Aetrix verify that STK15C88-SF45 is sourced from the original manufacturer or authorized distributors?

All STK15C88-SF45 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-SF45 meets industry standards.

7.What is the process for return or replacement of STK15C88-SF45?

All STK15C88-SF45 units undergo pre-shipment inspection (PSI). If there is an issue with STK15C88-SF45, 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-SF45 part is unused and in its original packaging.

Return procedure for STK15C88-SF45:

1.Submit a request within 90 days.

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

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