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Microchip Technology 93LC46B-I/ST
- Part No.:
- 93LC46B-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93LC46B-I/ST.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,867
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Product details
Overview
93LC46B-I/ST from Microchip Technology Inc. is a 1 Kbit (64 × 16-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating from 2.5 V to 5.5 V, rated for industrial temperature (−40°C to +85°C), and housed in an 8-lead SOIC package (ST). It features self-timed erase/write cycles, automatic ERAL before WRAL, Ready/Busy status via DO pin, and 1,000,000 endurance cycles - used for configuration storage in microcontroller-based embedded systems.
For engineers reviewing the 93LC46B-I/ST datasheet, 93LC46B-I/ST pinout, 93LC46B-I/ST application, or 93LC46B-I/ST equivalent, key selection criteria include its fixed 16-bit word organization (no ORG pin), industrial-grade temperature support, SOIC-8 package compatibility, and Microwire protocol timing compliance at up to 2 MHz (VCC ≥ 2.5 V).
Technical Context
The 93LC46B-I/ST implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin (dedicated x16 mode). It uses internal auto-erase-before-write logic and supports sequential read, ERAL, WRAL, EWEN/EWDS protection, and status polling via DO pin during programming.
Its architecture includes a 64-word × 16-bit memory array, address counter, mode decode logic, and output buffer. Power-on data protection activates below 1.5 V VCC threshold, and all instructions require a Start bit (CS high + DI high on CLK rising edge) followed by opcode, address, and data bits clocked on CLK rising edges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (64 × 16-bit organization; fixed, no ORG pin) |
| VCC range | 2.5 V to 5.5 V - supports wide supply margin in industrial 3.3 V and 5 V systems |
| Temperature grade | Industrial (−40°C to +85°C) - qualified for non-automotive embedded operation |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage, no SPI mode select needed |
| Write cycle time | 6 ms typical - enables predictable firmware timeout handling for write completion |
| Endurance | 1,000,000 erase/write cycles - suitable for frequent calibration or logging updates |
| Data retention | 200 years at 25°C - ensures long-term configuration integrity without refresh |
| Package | 8-lead SOIC (ST suffix) - industry-standard footprint, compatible with automated assembly |
Pinout & Package
8-lead SOIC (ST) package with 1.27 mm pitch; pin 1 marked by laser dot or notch; RoHS-compliant matte tin finish; exposed pad not present (unlike DFN/TDFN variants).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence |
| 3 (DI) | Data Input | Accepts Start bit, opcode, address, and write data; tied high with CS to initiate instruction |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS low or after status read |
| 5 (VSS) | Ground | Reference return path for all signals; must be low-impedance connection |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice |
| 7 (NC) | No Connect | Internally unconnected; same as pin 6 - no routing required |
| 8 (VCC) | Power Supply | 2.5–5.5 V supply; includes on-chip POR circuit triggering at ~1.5 V |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control; firmware only needs to poll DO pin for completion |
| Automatic ERAL before WRAL | Guarantees full-array readiness before bulk write - prevents partial writes or corruption |
| EWEN/EWDS security | Hardware-level write protection: device powers up in EWDS state, requiring explicit EWEN before any write |
| Ready/Busy status on DO | Enables non-blocking polling - avoids fixed delays and improves system responsiveness |
| 1,000,000 endurance cycles | Supports >100 daily writes over 27 years - viable for field-updatable parameter storage |
| Power-on/off data protection | Blocks all operations when VCC drops below 1.5 V - prevents inadvertent writes during brown-out |
Applications
| Industrial Sensor Calibration | Consumer Remote Control Memory |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients in HVAC or pressure transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed once at power-up; 16-bit word size matches ADC register width. Use Value: Eliminates external trimming components; enables post-manufacture calibration and field recalibration via MCU firmware. | Use Scenario: Retaining user-programmed channel presets and volume settings in IR remote controls. IC Role / Device Role / Timing Role: Low-power serial memory interfaced to 8-bit MCU; accessed infrequently during setup or button press events. Use Value: Maintains settings across battery replacement; 2.5 V minimum VCC allows direct use with single alkaline cell (1.5 V) + boost or dual-cell (3 V) supply. |
| Medical Device Configuration | Industrial PLC Parameter Storage |
Use Scenario: Holding safety-critical operational modes and alarm thresholds in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure configuration store with EWEN/EWDS enforcement; accessed during boot and service mode. Use Value: Prevents accidental overwrite during runtime; 200-year data retention meets medical device lifecycle requirements. | Use Scenario: Saving I/O mapping, scaling factors, and communication parameters in modular PLC backplanes. IC Role / Device Role / Timing Role: Industrial-grade EEPROM interfaced to ARM Cortex-M host; withstands repeated firmware updates. Use Value: −40°C to +85°C rating ensures reliability in cabinet-mounted controllers; SOIC-8 simplifies board-level repair and replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46B-I/SN | Same electrical specs and pinout; packaged in 8-lead PDIP instead of SOIC | Used in through-hole prototyping or legacy industrial boards where SOIC reflow is unavailable | Select for hand-soldering, breadboarding, or backward compatibility with PDIP footprints |
| AT25010B-SSHL-T | 1 Kbit SPI interface (4-wire), 1.8–5.5 V, 20 MHz max clock; no Ready/Busy pin - relies on WIP flag polling | Requires SPI peripheral instead of generic GPIO bit-banging; higher speed but less deterministic timing | Select when MCU has dedicated SPI hardware and higher throughput is needed; verify software overhead for flag polling vs. DO status |
Compared with 93LC46B-I/SN, the 93LC46B-I/ST offers identical functionality in surface-mount form for automated production; versus AT25010B-SSHL-T, it trades SPI speed for simpler 3-wire control and integrated Ready/Busy signaling - reducing firmware complexity in resource-constrained designs.
Availability
93LC46B-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer remote control memory, medical device configuration, and industrial PLC parameter storage requiring stable component supply, long-term obsolescence management, and RoHS-compliant sourcing.
Supply support for 93LC46B-I/ST 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 leading provider of microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC46B-I/ST belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for low-pin-count, low-power, nonvolatile configuration storage in cost-sensitive embedded systems where Microwire compatibility and robust write protection are essential.
FAQ
What is the memory organization of the 93LC46B-I/ST?
The 93LC46B-I/ST has a fixed 64 × 16-bit (1 Kbit) organization. Unlike 'C' variants, it lacks an ORG pin and is permanently configured for 16-bit word access - eliminating external configuration logic and simplifying interface timing for 16-bit data paths.
Does the 93LC46B-I/ST require an external pull-up resistor on the DO pin?
No, the 93LC46B-I/ST does not require an external pull-up on DO. The pin actively drives high/low during Read or Ready/Busy status, and enters High-Z when inactive. However, a 10 kΩ pull-down on CS is recommended per Microchip's application guidance to prevent spurious activation.
What is the maximum clock frequency supported by the 93LC46B-I/ST?
The 93LC46B-I/ST supports up to 2 MHz clock frequency when VCC is between 2.5 V and 5.5 V. At lower voltages (e.g., 1.8 V), the max clock drops to 1 MHz - but this does not apply to the 93LC46B-I/ST, as its minimum VCC is 2.5 V.
How does write protection work on the 93LC46B-I/ST?
The 93LC46B-I/ST powers up in Erase/Write Disable (EWDS) mode. An Erase/Write Enable (EWEN) command must be issued before any ERASE or WRITE instruction. After each write, executing EWDS restores protection - preventing accidental overwrites during noise events or power transients.
Can the 93LC46B-I/ST be used in automotive applications?
No, the 93LC46B-I/ST is rated for industrial temperature only (−40°C to +85°C). For automotive use, Microchip offers the 93LC46B-E/ST variant, qualified to AEC-Q100 Grade 2 (−40°C to +105°C) or Grade 1 (−40°C to +125°C), with identical pinout and functionality but extended qualification testing.
93LC46B-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Kbit
- Memory Organization:
- 64 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
93LC46B-I/ST FAQ
1.How can I place an order for 93LC46B-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46B-I/ST 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 93LC46B-I/ST reliable?
The price and inventory of 93LC46B-I/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC46B-I/ST is usually 5 days.
3.What payment methods are accepted for 93LC46B-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46B-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46B-I/ST?
93LC46B-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46B-I/ST 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 93LC46B-I/ST?
For technical support, including 93LC46B-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46B-I/ST requirements.
6.How does Aetrix verify that 93LC46B-I/ST is sourced from the original manufacturer or authorized distributors?
All 93LC46B-I/ST 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 93LC46B-I/ST meets industry standards.
7.What is the process for return or replacement of 93LC46B-I/ST?
All 93LC46B-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46B-I/ST, 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 93LC46B-I/ST part is unused and in its original packaging.
Return procedure for 93LC46B-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC46B-I/ST Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
Microchip Technology
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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