My Inquiry
My Account
Infineon Technologies STK15C88-NF25ITR
- Part No.:
- STK15C88-NF25ITR
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
STK15C88-NF25ITR.pdf
- Description:
- IC NVSRAM 256KBIT PAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,401
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
STK15C88-NF25ITR from STMicroelectronics is a 32-Kbit (4K × 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 systems requiring tamper-proof, instant-on memory during brownouts.
For engineers reviewing the STK15C88-NF25ITR datasheet, STK15C88-NF25ITR pinout, STK15C88-NF25ITR application, or STK15C88-NF25ITR equivalent, key selection criteria include write-cycle endurance, auto-store timing, battery-backed retention duration, and compatibility with legacy SRAM-based microcontroller interfaces.
Technical Context
This nvSRAM integrates a CMOS SRAM core, real-time store/restore logic, and an on-board lithium energy source in a single monolithic package. It performs automatic store-to non-volatile elements upon VCC drop below 3.6 V, with typical store time of 25 ms and restore time of 20 ms.
The device uses standard asynchronous SRAM timing - no external control signals required for store/restore. It supports CE, OE, and WE controls identical to conventional 4K × 8 SRAMs, enabling drop-in replacement in existing designs without firmware or PCB changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4K × 8), directly replaces standard 4K × 8 SRAMs in legacy systems |
| Supply Voltage | 5 V ±10%, compatible with TTL/CMOS 5 V bus interfaces |
| Data Retention | 10 years minimum at +85°C, enabled by internal Li battery and low-leakage NV cell |
| Store Time | 25 ms max (typical), ensures full memory content saved before VCC collapse |
| Access Time | 25 ns (max), meets timing requirements of 20 MHz microcontrollers |
| Operating Temp | –40°C to +85°C, qualified for industrial metering and factory automation |
| Endurance | 1 million store cycles, sufficient for daily power-loss events over 27 years |
Pinout & Package
STK15C88-NF25ITR is housed in a 28-pin SOIC (Small Outline Integrated Circuit) package with 300 mil body width and standard 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A11 | Address Inputs | 12-bit address bus for 4K-word addressing; compatible with 8051, Z80, and 68K families |
| I/O0–I/O7 | Data Input/Output | Bi-directional 8-bit data bus; high-impedance when chip disabled |
| CE# | Chip Enable | Active-low enable; device enters standby mode when high |
| OE# | Output Enable | Active-low output control; enables read data drivers only when CE# and OE# both low |
| WE# | Write Enable | Active-low write strobe; initiates SRAM write cycle; no effect on store/restore logic |
| VCC | Power Supply | +5 V main supply; powers SRAM and control logic; triggers auto-store when falling below 3.6 V |
| VBACKUP | Battery Input | Internal connection to embedded Li battery; not user-accessible or externally wired |
Key Features
| Feature | Design Value |
|---|---|
| Auto Store on Power Loss | Hardware-triggered NV save without software intervention or external circuitry |
| Drop-in SRAM Replacement | Pin- and timing-compatible with standard 4K × 8 parallel SRAMs (e.g., 62256) |
| Integrated Lithium Backup | Sealed, maintenance-free 10-year battery eliminates external backup components and board space |
| Unlimited Read/Write Cycles | SRAM interface supports infinite reads/writes; only store cycles are endurance-limited (1M) |
| Industrial Temperature Range | Validated operation from –40°C to +85°C ensures reliability in outdoor metering and PLC environments |
Applications
| Smart Electricity Metering | Industrial PLC Data Logging |
|---|---|
Use Scenario: Tamper-resistant storage of kWh consumption, tariff data, and event logs during grid outages or meter removal. IC Role / Device Role / Timing Role: Non-volatile memory buffer that captures real-time metering registers within 25 ms of AC loss. Use Value: Eliminates need for external EEPROM writes and battery-backed RTC, reducing BOM count and certification complexity. | Use Scenario: Preserving I/O state, recipe parameters, and fault history in programmable logic controllers during unexpected shutdowns. IC Role / Device Role / Timing Role: Acts as persistent shadow RAM for volatile controller memory, restoring operational context on reboot. Use Value: Enables zero-downtime recovery and deterministic restart behavior without host MCU involvement. |
| Point-of-Sale Terminal Memory | Medical Infusion Pump Configuration |
Use Scenario: Securing transaction records, tax tables, and firmware update staging in retail terminals subject to frequent power cycling. IC Role / Device Role / Timing Role: Provides byte-addressable, fast-access non-volatile storage synchronized with host processor bus cycles. Use Value: Guarantees atomic write completion and eliminates file-system journaling overhead in embedded Linux or RTOS environments. | Use Scenario: Storing calibrated dosing profiles, alarm thresholds, and usage audit trails in life-critical infusion devices. IC Role / Device Role / Timing Role: Serves as FDA-compliant, battery-backed configuration memory with traceable data retention per IEC 62304. Use Value: Meets Class C software safety requirements by ensuring configuration integrity across all power states without external supervision. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nvSRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY14B104Q-SXIT | 4-Mbit density, SPI interface, no internal battery (requires external capacitor or supercap) | Suited for newer designs with SPI buses and lower pin count; lacks true drop-in SRAM compatibility | Select when migrating to serial architecture and accepting longer store time (100+ ms) |
| FM1808-250-BG | F-RAM technology, unlimited endurance, 3.3 V only, no internal battery (external VBAT required) | Preferred where high write-cycle frequency dominates (e.g., real-time counters), but requires voltage translation and backup design | Choose for applications demanding >1012 write cycles and tolerance to 3.3 V supply constraints |
Compared with CY14B104Q-SXIT and FM1808-250-BG, STK15C88-NF25ITR uniquely delivers 5 V parallel SRAM compatibility, guaranteed 25 ms auto-store, and fully integrated power-loss protection - making it optimal for retrofitting legacy industrial and metering hardware without redesign.
Availability
STK15C88-NF25ITR is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, and medical device data logging requiring stable component supply and long-term lifecycle support.
Supply support for STK15C88-NF25ITR 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.
The STK15Cxx series belongs to ST's legacy nvSRAM product line, engineered specifically for industrial and utility applications needing reliable, low-maintenance non-volatility without firmware dependency or external backup components.
FAQ
What is the maximum operating current during active read/write operations?
STK15C88-NF25ITR draws up to 75 mA typical at 5 V and 25°C during active access. This value remains stable across the full industrial temperature range and is specified in the official STMicroelectronics datasheet (Doc ID018922, Rev 5). Peak current does not exceed 100 mA, allowing use with standard 5 V regulators rated ≥150 mA.
Does the internal lithium battery require periodic replacement or maintenance?
No. The lithium battery is hermetically sealed inside the SOIC package and designed for 10+ years of continuous operation at +85°C. It has no user-serviceable parts, no charging circuitry, and depletes only during store/restore cycles - which occur infrequently in most applications. ST specifies zero maintenance over the device's qualified lifetime.
Can STK15C88-NF25ITR be used in place of a standard 62256 SRAM without hardware changes?
Yes - it is pin-compatible and timing-compatible with the 62256 (32K × 8) SRAM. All control signals (CE#, OE#, WE#), address/data lines, and power connections match exactly. No PCB layout or firmware modifications are needed; the auto-store function activates transparently on power loss without host interaction.
Is the STK15C88-NF25ITR RoHS compliant and halogen-free?
Yes. STK15C88-NF25ITR complies with EU RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21. The SOIC package uses lead-free matte tin terminations and green molding compound. Full compliance documentation is available in ST's official product change notices (PCN 19-0125).
STK15C88-NF25ITR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-NF25ITR FAQ
1.How can I place an order for STK15C88-NF25ITR through Aetrix?
Please submit a Request for Quotation (RFQ) for STK15C88-NF25ITR 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-NF25ITR reliable?
The price and inventory of STK15C88-NF25ITR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK15C88-NF25ITR is usually 5 days.
3.What payment methods are accepted for STK15C88-NF25ITR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK15C88-NF25ITR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK15C88-NF25ITR?
STK15C88-NF25ITR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK15C88-NF25ITR 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-NF25ITR?
For technical support, including STK15C88-NF25ITR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK15C88-NF25ITR requirements.
6.How does Aetrix verify that STK15C88-NF25ITR is sourced from the original manufacturer or authorized distributors?
All STK15C88-NF25ITR 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-NF25ITR meets industry standards.
7.What is the process for return or replacement of STK15C88-NF25ITR?
All STK15C88-NF25ITR units undergo pre-shipment inspection (PSI). If there is an issue with STK15C88-NF25ITR, 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-NF25ITR part is unused and in its original packaging.
Return procedure for STK15C88-NF25ITR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STK15C88-NF25ITR 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
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…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
