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Microchip Technology 48LM01T-I/SM
- Part No.:
- 48LM01T-I/SM
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
48LM01T-I/SM.pdf
- Description:
- IC EERAM 1MBIT SPI 66MHZ 8SOIJ
- Quantity:
- Payment:
- Shipping:
Inventory:2,258
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Product details
Overview
48LM01T-I/SM from Microchip Technology Inc. is a 1-Mbit (131,072 × 8) SPI serial EERAM integrating a full SRAM array with cell-level hidden EEPROM backup. It operates at up to 66 MHz, supports symmetrical read/write timing, and delivers 3 μA hibernate current at 85°C. Used in industrial data logging systems where volatile memory persistence across power loss is critical.
For engineers reviewing the 48LM01T-I/SM datasheet, 48LM01T-I/SM pinout, 48LM01T-I/SM application, or 48LM01T-I/SM equivalent, this page provides verified electrical specs, SPI Mode 0/3 timing compliance, VCAP capacitor requirements, AutoStore trip voltage (2.30–2.65 V), and real-world use cases for nonvolatile SRAM replacement in embedded controllers and telemetry modules.
Technical Context
The 48LM01T-I/SM implements a dual-memory architecture: a 131,072 × 8-bit SRAM core backed by parallel cell-for-cell EEPROM storage. All SRAM-to-EEPROM transfers occur automatically on VCC drop below 2.30–2.65 V, using energy stored in the external VCAP capacitor (47–100 μF).
It uses standard SPI interface with Schmitt-trigger inputs, supports Modes 0 and 3 only, and requires WREN/WRSR commands to modify STATUS register bits BP1/BP0 (block write protection) and ASE (AutoStore enable). The HOLD pin suspends serial communication without resetting the sequence, provided SCK is low during assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 131,072 × 8-bit SRAM with integrated EEPROM backup - enables seamless data retention without software intervention. |
| SPI Clock Frequency | Up to 66 MHz - supports high-throughput logging in real-time control loops. |
| Operating Voltage | 2.7V–3.6V - compatible with standard 3.3V industrial logic rails and LDO outputs. |
| AutoStore Threshold | VTRIP = 2.30–2.65 V - triggers automatic SRAM→EEPROM save before brown-out failure. |
| Hibernate Current | 3 μA at 85°C - enables multi-year battery operation in remote sensor nodes. |
| VCAP Requirement | 47–100 μF, ≥6.3V rated - ensures sufficient hold-up energy for full-array backup within 10 ms. |
| Data Retention | 100 years at 55°C - guarantees long-term archival integrity for configuration and calibration data. |
| Endurance | 100,000 store cycles at 85°C - supports frequent power-cycle environments like smart meters. |
Pinout & Package
48LM01T-I/SM is housed in an 8-lead SOIJ (Small Outline J-bend) package, pin-compatible with SOIC but optimized for automated assembly and thermal performance in compact industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable; places SO in high-Z when deasserted - allows multi-device SPI bus sharing. |
| SO | Serial Data Output | MSb-first output; data valid after falling edge of SCK - matches standard SPI Mode 0/3 timing. |
| VCAP | External Capacitor Terminal | Connects to 47–100 μF capacitor - supplies energy for autonomous SRAM→EEPROM transfer during VCC loss. |
| VSS | Ground Reference | System ground return path - must be low-impedance to ensure stable VCAP charging and noise immunity. |
| SI | Serial Data Input | MSb-first input; latched on rising edge of SCK - accepts opcodes, addresses, and data bytes. |
| SCK | Serial Clock Input | Master-generated clock; defines SPI Mode 0 (idle low) or Mode 3 (idle high) - determines data sampling edge. |
| HOLD | Hold Input | Pauses ongoing SPI transaction without reset - requires SCK low during assertion/deassertion for reliable control. |
| VCC | Supply Voltage | 2.7–3.6V primary power rail - monitored internally to trigger AutoStore when falling below 2.30–2.65 V. |
Key Features
| Feature | Design Value |
|---|---|
| Cell-level EEPROM backup | Full 131,072×8-bit parallel transfer - eliminates software overhead and guarantees atomic save/restore. |
| Automatic power-fail response | VCC monitoring with 300 mV hysteresis - prevents spurious store/recall during marginal supply conditions. |
| 16-byte nonvolatile user space | Dedicated WRNUR/RDNUR command set - stores calibration constants or device IDs independent of main SRAM. |
| Schmitt-trigger inputs | Enhanced noise immunity on CS, SI, SCK, HOLD - reduces false triggering in electrically noisy industrial environments. |
| Block write protection | BP1/BP0 bits in STATUS register - enables hardware-enforced read-only regions (0%, 25%, 50%, or 100% of SRAM). |
| Hibernate mode | B9h command reduces current to 3 μA - extends battery life in always-on, event-triggered sensing applications. |
Applications
| Industrial Data Logger | Smart Energy Meter |
|---|---|
Use Scenario: Continuous acquisition of voltage, current, and temperature samples at 1 kHz, with periodic upload to cloud. IC Role / Device Role / Timing Role: Primary nonvolatile buffer storing last 72 hours of raw sensor data before transmission. Use Value: Eliminates need for external EEPROM + SRAM combo and associated firmware save logic; survives >100,000 power cycles. |
Use Scenario: Tamper-resistant storage of billing registers, tariff tables, and firmware update staging area. IC Role / Device Role / Timing Role: Secure SRAM with hardware write-protection (BP1/BP0 = 11) for critical metering parameters. Use Value: Prevents accidental or malicious overwrites while enabling fast read/write access during normal operation. |
| PLC I/O Module | Medical Diagnostic Sensor Hub |
Use Scenario: Storing configuration profiles (e.g., analog input scaling, filter coefficients) across firmware updates. IC Role / Device Role / Timing Role: Configuration memory with AutoRecall on power-up - restores calibrated state in <200 μs. Use Value: Ensures deterministic boot behavior and eliminates manual reconfiguration after maintenance. |
Use Scenario: Buffering high-resolution ECG waveform segments prior to compression and wireless transmission. IC Role / Device Role / Timing Role: Low-latency SRAM with guaranteed data retention during brief battery switchover events. Use Value: Meets IEC 60601-1 requirement for uninterrupted patient data capture during power transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY14V101QS-SZ25XIT | 1-Mbit nvSRAM with parallel interface; 25 ns access time; no SPI support. | Requires wider address/data bus and dedicated control lines - unsuitable for space-constrained SPI-only designs. | Choose only if legacy parallel bus architecture exists and ultra-low latency (<25 ns) is mandatory. |
| AT25SF041-SSHD-B | 4-Mbit SPI Flash with sector protection; no SRAM layer; no automatic power-loss save. | Needs external controller firmware to manage wear leveling and emulate SRAM behavior - increases BOM and validation effort. | Select when cost-per-bit is primary concern and deterministic power-loss recovery is not required. |
Compared with CY14V101QS-SZ25XIT and AT25SF041-SSHD-B, the 48LM01T-I/SM uniquely delivers true SRAM-like access with zero-software, zero-delay nonvolatile backup - making it optimal for industrial control, metering, and medical devices where data integrity across uncontrolled power events is non-negotiable.
Availability
48LM01T-I/SM is available at Aetrix Electronics and suitable for industrial data loggers, smart energy meters, and PLC I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for 48LM01T-I/SM 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
Microchip Technology Inc. is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions for industrial, automotive, and communications markets.
The 48LM01T-I/SM belongs to Microchip's EERAM product line, designed specifically to replace battery-backed SRAM and simplify nonvolatile data buffering in resource-constrained embedded systems.
FAQ
What is the function of the VCAP pin on the 48LM01T-I/SM?
The VCAP pin on the 48LM01T-I/SM connects to an external 47–100 μF capacitor that supplies energy during VCC dropout. When system voltage falls below 2.30–2.65 V, the 48LM01T-I/SM uses stored charge from this capacitor to autonomously transfer all 131,072 bytes from SRAM to EEPROM - ensuring zero-data-loss backup without host intervention.
Does the 48LM01T-I/SM support SPI Mode 1 or Mode 2?
No, the 48LM01T-I/SM supports SPI Modes 0 and 3 only. In both modes, data is latched on the rising edge of SCK and output on the falling edge. Mode 0 uses low-idle SCK; Mode 3 uses high-idle SCK. Modes 1 and 2 are not implemented - attempting them will result in incorrect data sampling or communication failure.
How does the 48LM01T-I/SM handle write protection?
The 48LM01T-I/SM implements hardware block write protection via BP1/BP0 bits in its STATUS register. These nonvolatile bits define four protection levels: none (00), upper quarter (01), upper half (10), or full array (11). Protection is enforced at the silicon level - writes to locked regions are ignored, and no error flag is generated.
Can the 48LM01T-I/SM be used as a direct replacement for standard SPI SRAMs?
Yes, the 48LM01T-I/SM is pin- and command-compatible with standard SPI SRAMs like the 48L512, supporting identical READ/WRITE opcodes (03h/02h) and timing. However, it adds AutoStore, Hibernate (B9h), and STATUS register control - features that require no changes to existing SRAM read/write code but enable new reliability capabilities.
What is the purpose of the 16-byte nonvolatile user space in the 48LM01T-I/SM?
The 16-byte nonvolatile user space in the 48LM01T-I/SM is a dedicated region accessible via WRNUR/C2h and RDNUR/C3h commands. It stores critical device-specific data - such as calibration offsets, serial numbers, or security keys - independently of the main SRAM array and is backed up alongside SRAM during AutoStore or software STORE operations.
48LM01T-I/SM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EERAM
- Technology:
- EEPROM, SRAM
- Memory Size:
- 1Mbit
- Memory Organization:
- 128K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 66 MHz
- Write Cycle Time - Word, Page:
- -
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIJ
48LM01T-I/SM FAQ
1.How can I place an order for 48LM01T-I/SM through Aetrix?
Please submit a Request for Quotation (RFQ) for 48LM01T-I/SM 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 48LM01T-I/SM reliable?
The price and inventory of 48LM01T-I/SM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 48LM01T-I/SM is usually 5 days.
3.What payment methods are accepted for 48LM01T-I/SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 48LM01T-I/SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 48LM01T-I/SM?
48LM01T-I/SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 48LM01T-I/SM 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 48LM01T-I/SM?
For technical support, including 48LM01T-I/SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 48LM01T-I/SM requirements.
6.How does Aetrix verify that 48LM01T-I/SM is sourced from the original manufacturer or authorized distributors?
All 48LM01T-I/SM 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 48LM01T-I/SM meets industry standards.
7.What is the process for return or replacement of 48LM01T-I/SM?
All 48LM01T-I/SM units undergo pre-shipment inspection (PSI). If there is an issue with 48LM01T-I/SM, 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 48LM01T-I/SM part is unused and in its original packaging.
Return procedure for 48LM01T-I/SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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