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Infineon Technologies STK14CA8-NF35ITR
- Part No.:
- STK14CA8-NF35ITR
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 32-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
STK14CA8-NF35ITR.pdf
- Description:
- IC NVSRAM 1MBIT PARALLEL 32SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,223
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Product details
Overview
STK14CA8-NF35ITR 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 PLCs for real-time parameter backup during brownouts.
For engineers reviewing the STK14CA8-NF35ITR datasheet, STK14CA8-NF35ITR pinout, STK14CA8-NF35ITR application, or STK14CA8-NF35ITR equivalent, key selection criteria include AutoStore timing (12.5 ms), VCAP capacitor requirement (17–120 µF), HSB hardware control interface, and SOIC-32 package compatibility with legacy board layouts.
Technical Context
The STK14CA8 integrates a standard 1024×1024 SRAM array with per-cell QuantumTrap nonvolatile elements, enabling atomic STORE/RECALL without external controllers. Its dual-mode operation supports both automatic power-loss detection (via internal voltage monitor at VSWITCH = 2.65 V) and explicit hardware/software initiation via HSB or command sequences.
It uses asynchronous parallel interface with active-low E (chip enable), G (output enable), and W (write enable), supporting two read cycles (address- and E/G-controlled) and two write cycles (W- and E-controlled). The HSB pin serves as both status output (low during STORE/RECALL) and optional hardware trigger input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 128K × 8 (1 Mb) - supports byte-wide microcontroller data logging buffers without address multiplexing. |
| Access Time | 35 ns - enables direct interfacing with 20–28 MHz microcontrollers without wait states. |
| VCC Range | 2.7 V to 3.6 V - compatible with 3.3 V system rails including industrial I/O modules with ±10% tolerance. |
| STORE Duration | 12.5 ms - defines minimum hold-up time required from VCAP capacitor during power failure. |
| Data Retention | 20 years at 55°C - ensures firmware configuration persistence across product lifecycle in unattended equipment. |
| Nonvolatile Cycles | 200,000 STORE operations - supports daily backup in telemetry gateways over >50 years of field use. |
| Operating Temp | –40°C to +85°C - qualified for deployment in outdoor industrial enclosures and transportation control units. |
Pinout & Package
STK14CA8-NF35ITR is packaged in a 32-pin SOIC (Small Outline Integrated Circuit) with 0.4-inch body width and RoHS-compliant lead finish. Pin layout follows JEDEC MS-012AC standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A16–A0 | Input | 17-bit address bus - fully decoded to access all 131,072 bytes; A16 enables full 1 Mb addressing without external latching. |
| DQ7–DQ0 | I/O | 8-bit bidirectional data bus - TTL-compatible, tri-stated when G or E is high, supports shared bus architectures. |
| E | Input | Active-low chip enable - selects device; falling edge latches address for write cycles per timing spec tELEH. |
| W | Input | Active-low write enable - controls SRAM write initiation; must be high during reads to prevent bus contention. |
| G | Input | Active-low output enable - enables DQ drivers during reads; high state forces tri-state for bus sharing. |
| HSB | I/O | Hardware Store Busy - open-drain output (weak pull-up) indicating STORE/RECALL progress; can be externally pulled low to initiate STORE. |
| VCAP | Power | AutoStore capacitor connection - requires 17–120 µF tantalum/ceramic cap to VSS to sustain STORE operation during VCC dropout. |
| VCC | Power | +3.0 V supply - regulated rail only; decoupling capacitor mandatory within 10 mm of pin per layout guidelines. |
| VSS | Power | Ground reference - dedicated return path; separate analog/digital grounding not required due to monolithic nvSRAM architecture. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic STORE on Power Loss | Triggers at VSWITCH = 2.65 V without external circuitry - eliminates need for supervisory ICs or discrete power-fail detection. |
| Software-Controlled STORE/RECALL | Executed via 3-byte command sequence (0x20, 0x00, 0x00) - enables deterministic backup before firmware updates or safe shutdown. |
| Unlimited SRAM Endurance | Zero wear-out mechanism for read/write - supports continuous logging in data acquisition systems without degradation. |
| Hardware STORE Initiation | Pulling HSB low initiates immediate STORE - allows external microcontroller or FPGA to force backup on critical event (e.g., emergency stop). |
| 20-Year Data Retention | Validated at 55°C ambient - ensures configuration integrity in sealed enclosures where thermal derating applies. |
Applications
| Industrial PLC Parameter Backup | Medical Device Configuration Storage |
|---|---|
|
Use Scenario: Retaining I/O mapping, PID tuning constants, and calibration offsets during unexpected AC mains interruption in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: Nonvolatile memory buffer interfaced directly to ARM Cortex-M4 bus; handles STORE within 12.5 ms of VCC drop below 2.65 V. Use Value: Eliminates supercapacitor-based backup circuits and reduces BOM count by replacing battery-backed SRAM + controller combo. |
Use Scenario: Preserving user-defined therapy profiles and sensor calibration data across power cycles in portable infusion pumps. IC Role / Device Role / Timing Role: Standalone nvSRAM connected to 8-bit microcontroller; RECALL completes before boot firmware initializes peripherals. Use Value: Meets IEC 62304 Class C software safety requirements by guaranteeing zero data loss during power transitions. |
| Smart Meter Firmware Rollback | Transportation Control Unit Logging |
|
Use Scenario: Storing validated firmware checksums and rollback pointers during OTA updates in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Dual-port accessible memory - SRAM side used for runtime code execution, nv side holds immutable recovery metadata. Use Value: Enables atomic firmware update with guaranteed revert capability, satisfying ANSI C12.22 Section 7.3.2.1 rollback integrity. |
Use Scenario: Capturing GPS timestamps, brake pressure events, and CAN message counters in rail signaling interlock controllers. IC Role / Device Role / Timing Role: High-reliability data logger with STORE triggered by watchdog timeout or external fault signal via HSB pin. Use Value: Provides EN 50126/50128-compliant event trace storage independent of main CPU health or power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK14CA8-RF35ITR | 48-pin SSOP package; identical electrical specs but larger PCB footprint and higher θja (51.1°C/W). | Used where board space permits larger package and thermal margin exceeds 35°C/W requirement. | Select only if SSOP-48 footprint exists in legacy design; SOIC-32 offers better thermal performance (θja = 37.9°C/W at 200 fpm). |
| FM1808-35-SG | Cypress-compatible pinout but uses ferroelectric RAM; 15 ns faster access, no VCAP capacitor, but limited to 10¹² write cycles. | Suitable for high-frequency logging (>1 kHz), but unsuitable for infrequent STORE with long-term retention assurance. | Prefer for speed-critical buffering; avoid where 20-year retention or unlimited STORE cycles are mandated by safety standards. |
Compared with STK14CA8-NF35ITR, the RF35ITR variant trades thermal efficiency for package compatibility in dense layouts, while FM1808-35-SG sacrifices retention longevity and STORE endurance for raw speed and capacitor-free operation - making STK14CA8-NF35ITR optimal for safety-critical, long-lifecycle industrial backup.
Availability
STK14CA8-NF35ITR is available at Aetrix Electronics and suitable for industrial automation, medical device manufacturing, and smart grid infrastructure requiring stable component supply with guaranteed 20-year data retention and 200K STORE cycle endurance.
Supply support for STK14CA8-NF35ITR 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) designs high-reliability memory and programmable solutions for industrial, automotive, and IoT applications, with global R&D centers and ISO/TS 16949-certified manufacturing.
The STK14CA8 belongs to Cypress's nvSRAM product line, engineered specifically to replace battery-backed SRAM and EEPROM in mission-critical systems where data integrity during power disruption is non-negotiable.
FAQ
What is the role of the VCAP pin and what capacitor value is required?
The VCAP pin supplies hold-up energy during power loss to complete the AutoStore operation. A 17–120 µF tantalum or ceramic capacitor rated for ≥5 V must be placed between VCAP and VSS, with ESR ≤ 1 Ω. Typical design uses 47 µF/6.3 V X7R ceramic for reliability and size efficiency.
Can STK14CA8-NF35ITR be used without connecting the HSB pin?
Yes - HSB is optional. When left unconnected, its internal weak pull-up keeps it high, allowing normal AutoStore/RECALL operation. It is only required when external hardware initiation of STORE or real-time status monitoring is needed.
How does software-controlled STORE differ from hardware STORE in timing behavior?
Software STORE begins after command execution and takes 12.5 ms (same as AutoStore), while hardware STORE initiated by pulling HSB low starts within 100 ns of the falling edge and also completes in 12.5 ms. Both suspend SRAM access during execution.
Is STK14CA8-NF35ITR compliant with modern RoHS and REACH requirements?
Yes - STK14CA8-NF35ITR is RoHS-compliant (Pb-free, halogen-free) and meets REACH SVHC thresholds. Its SOIC-32 package uses matte tin lead finish and complies with JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3).
STK14CA8-NF35ITR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 32-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:
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-SOIC
STK14CA8-NF35ITR FAQ
1.How can I place an order for STK14CA8-NF35ITR through Aetrix?
Please submit a Request for Quotation (RFQ) for STK14CA8-NF35ITR 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-NF35ITR reliable?
The price and inventory of STK14CA8-NF35ITR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK14CA8-NF35ITR is usually 5 days.
3.What payment methods are accepted for STK14CA8-NF35ITR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK14CA8-NF35ITR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK14CA8-NF35ITR?
STK14CA8-NF35ITR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK14CA8-NF35ITR 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-NF35ITR?
For technical support, including STK14CA8-NF35ITR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK14CA8-NF35ITR requirements.
6.How does Aetrix verify that STK14CA8-NF35ITR is sourced from the original manufacturer or authorized distributors?
All STK14CA8-NF35ITR 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-NF35ITR meets industry standards.
7.What is the process for return or replacement of STK14CA8-NF35ITR?
All STK14CA8-NF35ITR units undergo pre-shipment inspection (PSI). If there is an issue with STK14CA8-NF35ITR, 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-NF35ITR part is unused and in its original packaging.
Return procedure for STK14CA8-NF35ITR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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