48L640-I/SN Microchip Integrated Circuit (Small Outline Packages) In Stock
48L640-I/SN is a Microchip 64 Kbit standard SRAM with 8-bit width, a 66 MHz maximum clock, and SPI-compatible interface in an 8-pin SOIC package, available from stock with worldwide shipping.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- 48L640-I/SN Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 64 Kbit (65536-bit) storage density with 8-bit wide data bus for byte-addressable random access
- 66 MHz maximum clock frequency enabling fast SPI read/write cycles in embedded microcontroller systems
- Low-profile 8-pin SOIC-8 package compatible with standard SMT assembly processes
- Introduced in 2019 with JESD-609 e3 lead-free compliance for modern green-manufacturing requirements
Applications
The 48L640-I/SN is designed for embedded systems requiring a compact SPI SRAM expansion for data logging, buffering, and runtime variable storage where internal MCU RAM is insufficient. Its 66 MHz clock rate makes it suitable for high-speed microcontroller applications in industrial controllers, IoT edge nodes, and automotive ancillary modules. The standard SOIC-8 footprint allows drop-in integration on most existing PCB layouts with minimal redesign.
Specifications
| Manufacturer Package Code | SOIC-8 |
| Date Of Intro | 2019-10-28 |
| YTEOL | 0 |
| Clock Frequency-Max (fCLK) | 66MHz |
| I/O Type | COMMON |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e3 |
| Memory Density | 65536bit |
| Memory IC Type | STANDARD SRAM |
| Memory Width | 8 |
| Number of Functions | 1 |
| Number of Ports | 1 |
| Number of Words | 8192words |
| Number of Words Code | 8000 |
| Operating Mode | SYNCHRONOUS |
| Organization | 8KX8 |
| Output Characteristics | 3-STATE |
| Output Enable | NO |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.23 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Parallel/Serial | SERIAL |
| Standby Current-Max | 0.0002A |
| Standby Voltage-Min | 2.7V |
| Supply Current-Max | 0.005mA |
| Supply Voltage-Max (Vsup) | 3.6V |
| Supply Voltage-Min (Vsup) | 2.7V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.32.00.51 |
| Country of Origin | Thailand |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for 48L640-I/SN:
Frequently Asked Questions
What is the memory density and data width of the 48L640-I/SN, and how does that compare to typical on-chip SRAM?
The 48L640-I/SN provides 64 Kbit (8 KB) of storage organized as 8-bit wide words, which is 4× to 8× more than the on-chip SRAM found in many 8-bit or 32-bit microcontrollers in the 1–2 KB range. Accessed over an SPI bus at up to 66 MHz, it lets a small MCU handle larger data buffers without switching to a more expensive, higher-power processor.
Which embedded-system designs benefit most from adding the 48L640-I/SN as external SRAM?
Data-logging nodes, real-time sensor fusion boards, and communications gateways that temporarily stage incoming packets all benefit from the 48L640-I/SN's 8 KB capacity and 66 MHz SPI clock. The device suits battery-powered IoT designs because SPI overhead is minimal, and the SOIC-8 package adds only about 4.9 mm × 3.9 mm of board area. Industrial controllers that run RTOS tasks with large stack requirements also use this device to offload heap storage.
Is the 48L640-I/SN compliant with RoHS and lead-free assembly requirements?
Yes. The 48L640-I/SN carries JESD-609 code e3, indicating it is manufactured with lead-free, RoHS-compliant materials and is rated for 260 °C peak reflow compatible with standard lead-free solder profiles. This makes it suitable for consumer electronics, automotive ancillary boards, and medical devices where halogen-free or green-chemistry BOM requirements must be met.
When would a designer choose the 48L640-I/SN over a parallel-bus SRAM for a microcontroller project?
A designer chooses the 48L640-I/SN when pin count is constrained, because the SPI interface requires only 4 signal lines compared to 25 or more for an 8-bit parallel SRAM of equivalent depth. The 66 MHz SPI clock delivers peak throughput of approximately 8 MB/s, which is adequate for most buffering applications, while the 8-pin SOIC footprint saves significant PCB real estate versus parallel alternatives in 28- to 44-pin packages.
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