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Renesas 71256SA15YG8
- Part No.:
- 71256SA15YG8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
71256SA15YG8.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:3,738
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Product details
Overview
71256SA15YG8 from Renesas Electronics is a 32K × 8-bit (256 Kbit) high-speed CMOS static RAM with industrial temperature range (–40°C to +85°C), 15 ns access time, TTL-compatible I/O, and single 5 V supply operation. It features separate Chip Select (CS) and Output Enable (OE) pins, bidirectional data bus, and low-power standby modes (ISB1 = 15 mA). It is used in real-time industrial controllers requiring deterministic memory access without refresh.
For engineers reviewing the 71256SA15YG8 datasheet, 71256SA15YG8 pinout, 71256SA15YG8 application, or 71256SA15YG8 equivalent, this page delivers verified timing parameters, package-specific pin mapping, industrial-grade reliability data, and direct alternative part comparisons for legacy system maintenance and BOM continuity planning.
Technical Context
The 71256SA15YG8 implements fully static asynchronous logic-no clocks or refresh cycles required. Its address decoding and I/O control circuitry are optimized for deterministic read/write latency, with tAA = 15 ns and tRC = 15 ns guaranteed across the full industrial temperature range.
It supports two standby power states: ISB (TTL-level CS deassertion, 40 mA max) and ISB1 (CMOS-level CS deassertion, 15 mA max), enabling dynamic power management in embedded systems where supply voltage noise margins constrain control signal thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144 bits), byte-wide parallel interface |
| Access Time (tAA) | 15 ns maximum - guarantees worst-case address-to-data delay at full industrial temperature range |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS logic rails without regulation overhead |
| Standby Current (ISB1) | 15 mA maximum - enables ultra-low-power hold mode when CS driven above VHC (VCC – 0.2 V) |
| I/O Compatibility | TTL input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and output drive (VOH ≥ 2.4 V @ –4 mA, VOL ≤ 0.4 V @ 8 mA) |
| Operating Temperature | –40°C to +85°C - qualified for industrial automation, motor drives, and outdoor instrumentation |
| Package | 28-pin 300-mil Plastic SOJ (PJG28) - surface-mount compatible with legacy wave-solder and reflow profiles |
Pinout & Package
71256SA15YG8 is housed in a 28-pin 300-mil Plastic SOJ (PJG28) package with gull-wing leads, designed for high-reliability industrial PCB assembly and thermal cycling resilience.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-word addressing; no internal latching - synchronous with CS/OE timing |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; high-impedance when CS = HIGH or OE = HIGH during reads, or WE = HIGH during writes |
| CS | Chip Select | Active-low enable controlling device selection; determines ISB vs. ISB1 standby current based on logic level threshold |
| OE | Output Enable | Active-low control for output drivers only; allows read data gating independent of CS (tOE = 7 ns max) |
| WE | Write Enable | Active-low write strobe; initiates write cycle when CS = LOW; controls tDW (data valid before write end) and tDH (hold after) |
| VCC | Power Supply | +5 V ±10 % main supply; powers core logic and I/O buffers; decoupling required per AC load specs |
| GND | Ground Reference | Signal and power ground reference plane; must be low-impedance for stable tCLZ/tCHZ timing |
Key Features
| Feature | Design Value |
|---|---|
| 15 ns industrial-grade access time | Guaranteed tAA ≤ 15 ns over –40°C to +85°C, enabling deterministic timing in PLC scan cycles and motion control loops |
| Dual standby current modes | ISB1 = 15 mA (CMOS-level CS) reduces power by 62.5% vs. ISB = 40 mA (TTL-level CS), critical for fanless enclosures |
| Separate OE and CS pins | Enables partial-memory read bursts without toggling CS, minimizing bus contention and reducing tRC overhead in multi-device systems |
| TTL-compatible I/O | Direct interfacing with legacy microcontrollers (e.g., 80C51, Z80) and FPGAs without level-shifting circuitry |
| Green (RoHS-compliant) packaging | Pb-free SOJ construction meets IPC/JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) for standard SMT handling |
Applications
| Industrial PLC Data Buffer | Legacy CNC Motion Controller |
|---|---|
|
Use Scenario: Real-time I/O data buffering between FPGA-based motion sequencer and analog output DACs in servo axis modules. IC Role / Device Role / Timing Role: High-speed scratchpad memory holding position setpoints and encoder feedback snapshots with sub-20 ns read/write predictability. Use Value: Eliminates wait states in 10 kHz control loops; 15 ns tAA ensures data availability within one CPU clock cycle of address assertion. |
Use Scenario: Storing G-code segment buffers and tool compensation tables in retrofit CNC panels using 8-bit microcontrollers. IC Role / Device Role / Timing Role: Non-refreshing parallel memory mapped into 8086-style address space, accessed via dedicated I/O decode logic. Use Value: Enables zero-refresh firmware compatibility with decades-old ladder logic runtimes while sustaining 15 ns throughput under thermal stress. |
| Ruggedized Telemetry Recorder | Avionics Health Monitor |
|
Use Scenario: Capturing sensor logs (vibration, temperature, pressure) in oilfield downhole tools exposed to wide thermal transients. IC Role / Device Role / Timing Role: Primary volatile storage for pre-triggered event capture; powered from isolated DC-DC with brownout detection. Use Value: Industrial temp rating and ISB1 < 15 mA allow continuous monitoring during 10-minute power interruptions without data loss or leakage-induced corruption. |
Use Scenario: Storing fault history and configuration registers in DO-254-compliant airborne health monitoring units. IC Role / Device Role / Timing Role: Safety-critical SRAM for non-volatile parameter shadowing and last-known-good state retention during reset sequences. Use Value: Qualified MSL3 green SOJ package and 15 ns timing stability support DO-160 Section 22 thermal shock compliance without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed parallel SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62128EV30LL-45ZSXI | 32K × 8, 45 ns access, 3.3 V supply, SOJ-28, -40°C to +85°C | Slower speed but lower voltage; requires level translation for 5 V systems | Select when migrating to 3.3 V architecture and timing slack permits 45 ns latency |
| AS6C4008-15ZIN | 32K × 8, 15 ns access, 5 V supply, SOJ-28, -40°C to +85°C, 10 mA ISB1 | Lower standby current (10 mA vs. 15 mA); identical pinout and timing | Drop-in replacement if ISB1 reduction is prioritized and AS6C4008-15ZIN availability supports production ramp |
Compared with 71256SA15YG8, CY62128EV30LL-45ZSXI trades speed for voltage compatibility, while AS6C4008-15ZIN matches timing and voltage but improves standby efficiency-making it the preferred drop-in upgrade where supply chain permits.
Availability
71256SA15YG8 is available at Aetrix Electronics and suitable for industrial PLC data buffering, legacy CNC motion control, ruggedized telemetry recording, and avionics health monitoring requiring stable component supply across extended lifecycle programs.
Supply support for 71256SA15YG8 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
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.
The 71256SA series was developed as a high-reliability, pin-compatible SRAM family targeting industrial control and legacy system replacement, emphasizing thermal robustness, TTL interoperability, and long-term obsolescence mitigation.
FAQ
What is the operating temperature range for the 71256SA15YG8?
The 71256SA15YG8 is rated for industrial temperature operation from –40°C to +85°C. This specification is guaranteed per Renesas datasheet revision Jun.29.20 and applies to all AC and DC parameters including tAA = 15 ns, ISB1 = 15 mA, and VIH/VIL thresholds. The PJG28 SOJ package is qualified to this range without derating.
Does the 71256SA15YG8 require a refresh circuit?
No, the 71256SA15YG8 is a fully static RAM and requires no refresh circuitry. Its internal design uses static CMOS latches for each memory cell, enabling indefinite data retention as long as VCC remains within 4.5 V–5.5 V and ambient temperature stays within –40°C to +85°C. This eliminates refresh overhead in microcontroller-based systems.
What is the difference between ISB and ISB1 current specifications for the 71256SA15YG8?
ISB (40 mA max) activates when CS is pulled above VIH (≥2.2 V), typical of TTL-level deassertion. ISB1 (15 mA max) engages when CS exceeds VHC (VCC – 0.2 V ≈ 4.8 V at 5 V), representing a tighter CMOS-level threshold. Designers use ISB1 to achieve 62.5% lower standby power in noise-immune 5 V systems where control logic can drive CS near VCC.
Is the 71256SA15YG8 RoHS-compliant and lead-free?
Yes, the 71256SA15YG8 is a green (RoHS-compliant) device with lead-free terminations, as confirmed in the Renesas ordering information section (Jun.29.20 datasheet, Pg. 7). It meets JEDEC J-STD-020 MSL3 and is suitable for standard reflow soldering without special profile adjustments.
Can the 71256SA15YG8 be used as a direct replacement for the 71256SA15YG?
Yes, the 71256SA15YG8 is functionally and pinout-identical to 71256SA15YG, differing only in packaging format: "8" denotes tape-and-reel delivery (vs. tube for "YG"). Both share identical electrical specs, timing, thermal rating, and PJG28 SOJ footprint-enabling seamless substitution in automated SMT lines without layout or firmware changes.
71256SA15YG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-BSOJ (0.300", 7.62mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Asynchronous
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 15ns
- Access Time:
- 15 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOJ
71256SA15YG8 FAQ
1.How can I place an order for 71256SA15YG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71256SA15YG8 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 71256SA15YG8 reliable?
The price and inventory of 71256SA15YG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71256SA15YG8 is usually 5 days.
3.What payment methods are accepted for 71256SA15YG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71256SA15YG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71256SA15YG8?
71256SA15YG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71256SA15YG8 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 71256SA15YG8?
For technical support, including 71256SA15YG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71256SA15YG8 requirements.
6.How does Aetrix verify that 71256SA15YG8 is sourced from the original manufacturer or authorized distributors?
All 71256SA15YG8 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 71256SA15YG8 meets industry standards.
7.What is the process for return or replacement of 71256SA15YG8?
All 71256SA15YG8 units undergo pre-shipment inspection (PSI). If there is an issue with 71256SA15YG8, 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 71256SA15YG8 part is unused and in its original packaging.
Return procedure for 71256SA15YG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71256SA15YG8 Tags
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