My Inquiry
My Account
Microchip Technology 93LC46CT-I/ST
- Part No.:
- 93LC46CT-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93LC46CT-I/ST.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,228
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
93LC46CT-I/ST from Microchip Technology Inc. is a 1 Kbit (128 × 8-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 TSSOP package. It features self-timed erase/write cycles, automatic erase-all before write-all, power-on/off data protection, and 1,000,000 endurance cycles - used for configuration storage in embedded microcontroller systems.
For engineers reviewing the 93LC46CT-I/ST datasheet, 93LC46CT-I/ST pinout, 93LC46CT-I/ST application, or 93LC46CT-I/ST equivalent, key selection criteria include voltage range compatibility (2.5–5.5 V), TSSOP-8 footprint constraints, 8-bit x128 organization (no ORG pin), Ready/Busy status signaling via DO, and support for sequential read and WRAL/ERAL commands in resource-constrained designs.
Technical Context
This device implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins, requiring no external clock source beyond the host's serial clock. Its internal logic decodes opcodes (READ, WRITE, ERASE, EWEN/EWDS, ERAL, WRAL) on rising CLK edges and uses DO both for data output and real-time Ready/Busy status polling during programming.
The 93LC46CT-I/ST lacks an ORG pin (confirmed by Device Selection Table and Pin Function Table), fixing its memory organization at 128 × 8-bit. It powers up in EWDS mode, mandating explicit EWEN before any erase/write, and includes built-in VCC detection (VPOR = 1.5 V typical) to inhibit operations below safe supply thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit organization; no ORG pin - fixed x8 mode) |
| VCC range | 2.5 V to 5.5 V - supports wide-range industrial power rails without level-shifting |
| Endurance | 1,000,000 erase/write cycles - enables frequent firmware or calibration updates |
| Data retention | >200 years at 25°C - suitable for long-lifecycle industrial deployments |
| Write cycle time | 6 ms typical (TWC) - defines minimum interval between successive writes |
| Max clock frequency | 3 MHz at VCC ≥ 4.5 V - sets upper bound on serial transaction throughput |
| Operating temp | −40°C to +85°C (Industrial grade) - validated for extended ambient operation |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage on host MCU |
Pinout & Package
8-lead TSSOP (ST) package per Microchip DS20001749K, Pb-free Matte Tin finish, 3.0 mm × 4.4 mm body, 0.65 mm lead pitch. Pin 1 marked by laser dot; pin 1 ID corner confirmed in Package Drawing (DS20001749K-page 18).
| 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 opcodes, addresses, and data |
| 3 (DI) | Data Input | Accepts Start bit, instruction opcodes, address bits, and write data; shares net with DO in bidirectional configs |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS is low |
| 5 (VSS) | Ground | Reference return path for all I/O and internal circuitry; must be low-impedance |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS per design guidelines |
| 7 (ORG) | Organization Select | Not present on 93LC46A variants - pin 7 is NC; not used in 93LC46CT-I/ST |
| 8 (VCC) | Power Supply | 2.5–5.5 V supply; includes internal POR circuit triggering at ~1.5 V |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control - host only polls DO for completion |
| Automatic ERAL before WRAL | Ensures full array erase prior to bulk write, preventing partial-data corruption |
| Power-on/off data protection | Hardware-level inhibition below VPOR (~1.5 V) prevents inadvertent writes during brown-out |
| Ready/Busy status on DO | Enables non-blocking host firmware - DO low = active programming, high = ready |
| Sequential read mode | Reduces command overhead - holding CS high auto-increments address across reads |
| EWEN/EWDS security lock | Prevents accidental writes; device powers up in EWDS state, requiring explicit enable |
Applications
| Industrial Sensor Calibration Storage | Embedded MCU Configuration Memory |
|---|---|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients in HVAC controllers and pressure transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed infrequently during startup or field recalibration. Use Value: Retains calibrated values across 200+ years and 1M cycles, eliminating battery-backed SRAM and reducing BOM cost. |
Use Scenario: Holding boot parameters, network MAC addresses, and user preferences in smart metering endpoints. IC Role / Device Role / Timing Role: Serial configuration store interfaced directly to MCU GPIOs using 3-wire Microwire protocol. Use Value: 2.5–5.5 V operation matches MCU I/O voltage, and 6 ms write time allows fast parameter updates without blocking main application loop. |
| Consumer Appliance Settings Retention | Automotive Body Control Module NVM |
Use Scenario: Preserving user-selected cooking modes, timers, and display brightness in microwave ovens and dishwashers. IC Role / Device Role / Timing Role: Low-power serial EEPROM accessed during power-up and settings change events. Use Value: 1 µA standby current (ICCS) minimizes battery drain in always-on standby circuits. |
Use Scenario: Storing door lock configuration, mirror position presets, and lighting profiles in automotive BCMs. IC Role / Device Role / Timing Role: Industrial-grade (−40°C to +85°C) nonvolatile memory co-located with 5 V MCU peripherals. Use Value: TSSOP-8 footprint enables compact PCB layout; RoHS-compliant Matte Tin finish meets automotive sourcing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46BT-I/ST | 16-bit x64 organization (64 words × 16 bits); same VCC, temp, package, and pinout | Requires host software to handle 16-bit word addressing and data packing; incompatible with existing 8-bit firmware | Select only if system architecture mandates 16-bit data alignment and host can restructure memory access routines. |
| AT25010B-SSHL-T | SPI interface (4-wire), 1 Kbit x8, 1.8–5.5 V, SOIC-8; no Ready/Busy pin - relies on WIP flag polling | Requires additional CS and MOSI/MISO lines; lacks dedicated DO-as-status feature; different command set | Choose when migrating to SPI-based platforms or when needing lower 1.8 V operation; verify timing and polling overhead impact. |
Compared with 93LC46BT-I/ST, the 93LC46CT-I/ST provides native 8-bit data width without software bit manipulation; versus AT25010B-SSHL-T, it retains Microwire simplicity and integrated Ready/Busy signaling but requires strict adherence to 3-wire timing margins.
Availability
93LC46CT-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded MCU configuration, and consumer appliance settings retention requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for 93LC46CT-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 93LC46 series belongs to Microchip's legacy serial EEPROM product line, designed specifically for low-pin-count, low-power, and cost-sensitive embedded systems requiring reliable nonvolatile storage without complex interface logic.
FAQ
What is the memory organization of the 93LC46CT-I/ST?
The 93LC46CT-I/ST is a fixed 128 × 8-bit (1 Kbit) device with no ORG pin - confirmed by the Device Selection Table and Pin Function Table in DS20001749K. Unlike 'C' variants, the 'A' suffix denotes dedicated x8 operation, eliminating configuration dependency on external logic levels. This simplifies host firmware and ensures deterministic addressing behavior across all units of 93LC46CT-I/ST.
Does the 93LC46CT-I/ST support 1.8 V operation?
No, the 93LC46CT-I/ST has a minimum VCC rating of 2.5 V per the Device Selection Table and Electrical Characteristics (D11, VPOR). It is not compatible with 1.8 V systems. For 1.8 V operation, consider the 93AA46A/B/C family (e.g., 93AA46AT-I/ST), which specifies 1.8–5.5 V range and shares identical pinout and instruction set.
How is Ready/Busy status monitored on the 93LC46CT-I/ST?
Ready/Busy status is signaled on the DO pin: DO = low indicates active erase/write, DO = high means operation complete. To sample status, CS must be brought high for ≥250 ns after TCSL, then DO sampled on CLK rising edges. The 93LC46CT-I/ST does not require external status registers - this hardware-integrated polling reduces host resource usage and eliminates timing-critical software delays.
Is the ORG pin functional on the 93LC46CT-I/ST?
No - the 93LC46CT-I/ST is an 'A' variant, meaning it has no functional ORG pin. Per the Device Selection Table and Pin Function Table, pin 7 is designated NC (No Connection) for all 'A' and 'B' versions. The 'C' variants (e.g., 93LC46CT-I/ST is not a 'C') include ORG; this part is strictly 8-bit x128 and requires no external configuration.
What is the maximum clock frequency supported by the 93LC46CT-I/ST?
The 93LC46CT-I/ST supports up to 3 MHz clock frequency when VCC is 4.5 V to 5.5 V (Table 1-2, A1). At 2.5 V ≤ VCC < 4.5 V, max clock drops to 2 MHz; below 2.5 V, it is not rated. These limits are defined by AC timing parameters (TCKH, TCKL) and ensure reliable setup/hold margins - exceeding them risks opcode misreads or write failures in 93LC46CT-I/ST operation.
93LC46CT-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Kbit
- Memory Organization:
- 128 x 8, 64 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 3 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
93LC46CT-I/ST FAQ
1.How can I place an order for 93LC46CT-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46CT-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 93LC46CT-I/ST reliable?
The price and inventory of 93LC46CT-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 93LC46CT-I/ST is usually 5 days.
3.What payment methods are accepted for 93LC46CT-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46CT-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46CT-I/ST?
93LC46CT-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46CT-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 93LC46CT-I/ST?
For technical support, including 93LC46CT-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46CT-I/ST requirements.
6.How does Aetrix verify that 93LC46CT-I/ST is sourced from the original manufacturer or authorized distributors?
All 93LC46CT-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 93LC46CT-I/ST meets industry standards.
7.What is the process for return or replacement of 93LC46CT-I/ST?
All 93LC46CT-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46CT-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 93LC46CT-I/ST part is unused and in its original packaging.
Return procedure for 93LC46CT-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC46CT-I/ST Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
