AS4C16M16SB-7TCN
| Part Description |
IC DRAM 256MBIT LVTTL 54TSOP II |
|---|---|
| Quantity | 175 Available (as of May 6, 2026) |
| Product Category | Memory |
|---|---|
| Manufacturer | Alliance Memory, Inc. |
| Manufacturing Status | Active |
| Manufacturer Standard Lead Time | 4 Weeks |
| Datasheet |
Specifications & Environmental
| Device Package | 54-TSOP II | Memory Format | DRAM | Technology | SDRAM | ||
|---|---|---|---|---|---|---|---|
| Memory Size | 256 Mbit | Access Time | 5.4 ns | Grade | Commercial | ||
| Clock Frequency | 143 MHz | Voltage | 3V ~ 3.6V | Memory Type | Volatile | ||
| Operating Temperature | 0°C ~ 70°C (TA) | Write Cycle Time Word Page | 14 ns | Packaging | 54-TSOP (0.400", 10.16mm Width) | ||
| Mounting Method | Volatile | Memory Interface | LVTTL | Memory Organization | 16M x 16 | ||
| Moisture Sensitivity Level | 3 (168 Hours) | RoHS Compliance | ROHS3 Compliant | REACH Compliance | REACH Unaffected | ||
| Qualification | N/A | ECCN | EAR99 | HTS Code | 8542.32.0041 |
Overview of AS4C16M16SB-7TCN - 256Mbit LVTTL SDRAM in 54-TSOP II Package
The AS4C16M16SB-7TCN from Alliance Memory is a 256-megabit synchronous DRAM designed for applications requiring reliable, cost-effective volatile memory. Organized as 16M x 16, this SDRAM operates on a standard 3.0V to 3.6V supply and uses an LVTTL interface, making it compatible with a wide range of digital systems. With a 143MHz clock frequency and 5.4ns access time, this device delivers dependable performance for embedded systems, industrial equipment, and legacy system upgrades.
Key Features
- 256Mbit Memory Capacity - Configured as 16M x 16, providing 256 megabits of storage suitable for buffering, data processing, and system memory applications.
- SDRAM Technology - Synchronous DRAM architecture enables pipelined operations and burst access modes for efficient data throughput in clocked systems.
- 143MHz Clock Frequency - Supports clock rates up to 143MHz with 5.4ns access time and 14ns write cycle time for responsive memory operations.
- LVTTL Interface - Low-voltage TTL signaling ensures compatibility with 3.3V logic families commonly found in microcontrollers, FPGAs, and embedded processors.
- 3.0V to 3.6V Operation - Standard supply voltage range simplifies power supply design and reduces component count in cost-sensitive applications.
- 54-TSOP II Package - Thin small-outline package with 0.400" (10.16mm) width offers a compact footprint for space-constrained PCB layouts.
- Commercial Temperature Range - Operates from 0°C to 70°C, suitable for indoor and climate-controlled environments.
Typical Applications
- Industrial Control Systems - This SDRAM provides working memory for PLCs, motion controllers, and HMI panels where reliable data buffering supports real-time control loops and operator interface responsiveness.
- Legacy System Upgrades - The AS4C16M16SB-7TCN serves as a pin-compatible replacement for obsolete SDRAM components, extending the service life of existing equipment without requiring board redesign.
- Embedded Computing Platforms - This device functions as system RAM in single-board computers and embedded modules running operating systems or application firmware that require moderate memory capacity.
- Test and Measurement Equipment - The SDRAM enables data acquisition systems and instruments to buffer sampled data before processing or transmission, improving measurement throughput.
- Networking Equipment - This memory supports packet buffering and routing table storage in switches, routers, and network appliances operating in commercial temperature environments.
Unique Advantages
- Active Lifecycle Status: Currently in production, ensuring long-term availability for new designs and ongoing procurement for existing products.
- Standard Voltage Operation: 3.3V supply compatibility eliminates the need for voltage level translation or multiple power rails, simplifying board design and reducing BOM cost.
- Proven SDRAM Architecture: Mature technology with well-understood timing characteristics and broad toolchain support reduces integration risk and development time.
- Compact TSOP II Footprint: Space-efficient package allows higher memory density on constrained PCBs while maintaining ease of inspection and rework compared to fine-pitch BGAs.
- Cost-Effective Memory Solution: Balances performance and price for applications where DDR memory would be over-specified, optimizing total system cost.
- Broad Compatibility: LVTTL interface and standard pinout work with existing SDRAM controller IP and reference designs, accelerating time-to-market.
Why Choose the AS4C16M16SB-7TCN?
The AS4C16M16SB-7TCN is engineered for embedded and industrial applications where proven SDRAM technology meets requirements for moderate memory capacity, standard voltage operation, and commercial temperature performance. Its active production status makes it suitable for both new product development and long-term manufacturing, while the LVTTL interface ensures seamless integration with existing controller architectures. Designers selecting this component benefit from a reliable memory solution that balances performance, footprint, and cost without over-engineering for applications that do not require extended temperature ranges or advanced DDR technologies.
Whether you are maintaining legacy equipment, designing cost-optimized embedded systems, or building industrial control platforms, the AS4C16M16SB-7TCN delivers the memory performance your application needs with the supply continuity your business requires.
Get Started with the AS4C16M16SB-7TCN
Contact our sales team to request a quote, discuss volume pricing, or inquire about technical specifications and availability. Our application engineers are available to assist with integration questions and design recommendations.
