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Infineon Technologies STK14CA8-RF35TR
- Part No.:
- STK14CA8-RF35TR
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
STK14CA8-RF35TR.pdf
- Description:
- IC NVSRAM 1MBIT PARALLEL 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,850
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Product details
Overview
STK14CA8-RF35TR from Cypress Semiconductor is a 128K × 8 (1 Mb) nonvolatile static RAM with integrated QuantumTrap storage, operating at 3.0V ±10%, offering 35 ns read/write cycle time, automatic STORE on power loss, and automatic RECALL on power-up. It delivers unlimited SRAM read/write endurance, 200K nonvolatile STORE cycles, and 20-year data retention at 55°C - deployed in industrial control modules requiring persistent memory without battery backup.
For engineers reviewing the STK14CA8-RF35TR datasheet, STK14CA8-RF35TR pinout, STK14CA8-RF35TR application, or STK14CA8-RF35TR equivalent, key selection criteria include AutoStore timing (12.5 ms), VCAP capacitor requirement (17–120 µF), HSB hardware store busy signaling, and compatibility with standard parallel SRAM interfaces in legacy industrial systems.
Technical Context
The STK14CA8-RF35TR integrates a 1024 × 1024 SRAM array with per-cell QuantumTrap nonvolatile storage, enabling monolithic, single-chip nvSRAM functionality. Its dual-mode STORE operation supports both automatic detection of VCC drop below 2.65 V and hardware-triggered STORE via HSB pin assertion.
RECALL occurs automatically when VCC rises above 2.65 V, completing within 20 ms; software-controlled STORE/RECALL is enabled via specific address/command sequences. The device uses standard asynchronous parallel interface timing (E, G, W controls) with no external clock required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 128K × 8 (1 Mb) - supports byte-wide parallel bus interfacing with 17 address lines (A0–A16). |
| Access/Cycle Time | 35 ns - defines maximum sustained read/write throughput for real-time data logging in PLCs. |
| VCC Operating Range | 2.7 V to 3.6 V - compatible with 3.3 V systems; tolerates ±10% supply variation without reset or data corruption. |
| Nonvolatile STORE Cycles | 200,000 - specifies guaranteed endurance for frequent power-loss events in energy-metering applications. |
| Data Retention | 20 years at 55°C - ensures long-term firmware or calibration data persistence without refresh or backup power. |
| VCAP Capacitor Range | 17–120 µF (5 V rated) - determines minimum hold-up time during brownout; value selected based on system capacitance and load current. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including factory automation and motor drives. |
Pinout & Package
STK14CA8-RF35TR is packaged in a 48-pin SSOP (RF package), RoHS-compliant, with 0.5 mm pitch and footprint optimized for space-constrained industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A16–A0 | Input | 17-bit address bus - selects one of 131,072 bytes; A16 enables full 1 Mb addressing. |
| DQ7–DQ0 | I/O | 8-bit bidirectional data bus - connects directly to microcontroller or FPGA data lines without level translation. |
| E | Input | Active-low chip enable - controls device selection; falling edge latches address for write operations. |
| W | Input | Active-low write enable - initiates SRAM write when E is low; must be high during reads. |
| G | Input | Active-low output enable - enables DQ drivers during reads; tri-states outputs when high. |
| HSB | I/O | Hardware Store Busy - open-drain output signals STORE progress; pulled low externally to trigger manual STORE. |
| VCAP | Power | AutoStore capacitor connection - supplies energy during VCC collapse to complete STORE before power loss. |
| VCC / VSS | Power | 3.0 V supply and ground - requires local decoupling; VSS pins distributed across package for low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic STORE on Power Loss | Detects VCC drop below 2.65 V and initiates nonvolatile save without host intervention - eliminates need for external voltage monitors or backup batteries. |
| Software-Controlled STORE/RECALL | Executed via defined address/command sequences - enables deterministic save points during firmware updates or configuration changes. |
| Unlimited SRAM Read/Write Endurance | Zero wear-out mechanism for volatile access - supports continuous logging or buffer cycling in telemetry gateways. |
| 20-Year Data Retention | Validated at 55°C ambient - ensures calibration tables, serial numbers, or security keys remain intact over product lifetime. |
| Parallel Interface Compatibility | Matches standard asynchronous SRAM timing (E/G/W control) - drop-in replacement for volatile SRAM in existing designs with minimal layout change. |
Applications
| Industrial Programmable Logic Controllers (PLCs) | Smart Energy Meters |
|---|---|
|
Use Scenario: Storing runtime I/O state and ladder logic execution context during unexpected AC mains dropout. IC Role / Device Role / Timing Role: Nonvolatile SRAM preserving critical process variables and fault logs without battery or supercapacitor support. Use Value: Enables deterministic restart after power recovery with zero data loss - meeting IEC 61000-4-11 immunity requirements for voltage dips. |
Use Scenario: Capturing cumulative kWh readings and tariff-switch timestamps during grid blackouts lasting seconds to minutes. IC Role / Device Role / Timing Role: Persistent memory holding metrology registers and billing data between metering IC interrupts and MCU processing cycles. Use Value: Guarantees regulatory compliance for revenue-grade metering by retaining tamper-proof usage history across >200,000 power-loss events. |
| Factory Automation HMIs | Medical Diagnostic Equipment Logs |
|
Use Scenario: Maintaining operator session settings, alarm history, and calibration offsets during scheduled maintenance power-downs. IC Role / Device Role / Timing Role: Fast-access nonvolatile storage bridging SRAM speed and EEPROM reliability - accessed as memory-mapped region. Use Value: Eliminates boot-time EEPROM polling delays; enables instant UI resume with full context restoration in <20 ms. |
Use Scenario: Recording sensor self-test results, error codes, and diagnostic timestamps during MRI or ultrasound system power cycling. IC Role / Device Role / Timing Role: Fail-safe memory for FDA-required audit trails - immune to write-cycle exhaustion unlike flash or EEPROM. Use Value: Supports 20-year device lifecycle with zero risk of log corruption due to write endurance limits - verified per IEC 62304. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK14CA8-RF25TR | 25 ns access time; higher ICC1 (65 mA avg); identical pinout and STORE/RECALL behavior. | Better suited for high-throughput data acquisition where sub-30 ns latency is required. | Select when system timing budget demands faster read/write cycles and power consumption is secondary. |
| STK14CA8-RF45TR | 45 ns access time; lower ICC1 (50 mA avg); same VCAP range and 200K STORE endurance. | Optimized for ultra-low-power industrial sensors with infrequent writes and extended battery life. | Choose for cost-sensitive, low-duty-cycle applications where 45 ns timing satisfies controller interface constraints. |
Compared with STK14CA8-RF25TR and STK14CA8-RF45TR, the RF35TR balances speed (35 ns), power (55 mA avg), and thermal performance (θja = 41.8°C/W at 500 fpm) - making it the optimal fit for mid-tier industrial controllers requiring robustness and predictable timing margins.
Availability
STK14CA8-RF35TR is available at Aetrix Electronics and suitable for industrial programmable logic controllers, smart energy meters, factory HMIs, and medical diagnostic equipment requiring stable component supply and long-term obsolescence management.
Supply support for STK14CA8-RF35TR 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
Cypress Semiconductor (now part of Infineon Technologies) is a U.S.-based semiconductor company specializing in memory, microcontrollers, and connectivity solutions for industrial and automotive markets.
The STK14CA8 series belongs to Cypress's nvSRAM product line, designed specifically to replace battery-backed SRAM in mission-critical industrial systems where reliability, zero-maintenance operation, and regulatory compliance are mandatory.
FAQ
What is the function of the VCAP pin, and what capacitor value should be used?
The VCAP pin connects an external storage capacitor that supplies energy during VCC collapse to complete the AutoStore operation. Cypress specifies 17–120 µF, 5 V-rated tantalum or ceramic capacitors. A 47 µF capacitor is commonly used to achieve ~10 ms hold-up time under typical 10 mA load conditions, ensuring reliable STORE completion before power loss.
Can STK14CA8-RF35TR be used as a direct replacement for standard SRAMs?
Yes - it is pin- and timing-compatible with industry-standard 128K×8 parallel SRAMs (e.g., IS61LV1024), supporting identical E/G/W control protocols. However, the HSB pin must be left unconnected or pulled high if unused, and VCAP must be populated; no firmware changes are needed for basic read/write operation.
How does AutoStore differ from software-controlled STORE?
AutoStore triggers automatically when VCC drops below 2.65 V, requiring no host action. Software STORE uses a defined address sequence (e.g., writing to 0x0000 followed by 0x0001) to initiate nonvolatile save on demand - useful for saving configuration before firmware updates or safe shutdown sequences.
Is STK14CA8-RF35TR recommended for new designs?
No - Cypress has marked the STK14CA8 family as "Not Recommended for New Designs" (NRND) due to end-of-life planning. Aetrix Electronics supports legacy production and repair programs with verified stock, but recommends evaluating Infineon's newer nvSRAM families (e.g., CY14B101QN) for new projects requiring long-term supply assurance.
STK14CA8-RF35TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 48-BSSOP (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:
- 1Mbit
- Memory Organization:
- 128K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 35ns
- Access Time:
- 35 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
STK14CA8-RF35TR FAQ
1.How can I place an order for STK14CA8-RF35TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STK14CA8-RF35TR 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 STK14CA8-RF35TR reliable?
The price and inventory of STK14CA8-RF35TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK14CA8-RF35TR is usually 5 days.
3.What payment methods are accepted for STK14CA8-RF35TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK14CA8-RF35TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK14CA8-RF35TR?
STK14CA8-RF35TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK14CA8-RF35TR 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 STK14CA8-RF35TR?
For technical support, including STK14CA8-RF35TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK14CA8-RF35TR requirements.
6.How does Aetrix verify that STK14CA8-RF35TR is sourced from the original manufacturer or authorized distributors?
All STK14CA8-RF35TR 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 STK14CA8-RF35TR meets industry standards.
7.What is the process for return or replacement of STK14CA8-RF35TR?
All STK14CA8-RF35TR units undergo pre-shipment inspection (PSI). If there is an issue with STK14CA8-RF35TR, 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 STK14CA8-RF35TR part is unused and in its original packaging.
Return procedure for STK14CA8-RF35TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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