My Inquiry
My Account
Microchip Technology 93LC46CT-E/SN
- Part No.:
- 93LC46CT-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC46CT-E/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,220
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
93LC46CT-E/SN 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 automotive temperature range (−40°C to +125°C), and housed in an 8-lead SOIC package (SN). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and Ready/Busy status signaling via DO pin - used in engine control units, infotainment configuration storage, and automotive sensor calibration memory.
For engineers reviewing the 93LC46CT-E/SN datasheet, 93LC46CT-E/SN pinout, 93LC46CT-E/SN application, or 93LC46CT-E/SN equivalent, key selection considerations include its automotive-grade temperature support, 8-bit fixed organization (no ORG pin), 1 million erase/write endurance, 200-year data retention, and compatibility with legacy Microwire-based microcontroller peripherals requiring minimal GPIO overhead.
Technical Context
The 93LC46CT-E/SN implements a synchronous serial Microwire interface with CS, CLK, and DI/DO lines - no ORG pin (fixed 8-bit x128 organization). Its internal logic includes auto-erase-before-write, ERAL-initiated full-array erase, and EWEN/EWDS command-based write protection, all managed without external timing components.
It uses CMOS EEPROM cell technology with on-chip charge pump for programming, supports sequential read, and delivers Ready/Busy status via DO pin polling during erase/write operations - enabling non-blocking firmware execution in resource-constrained automotive microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit); provides compact nonvolatile storage for calibration constants, fault logs, or device IDs in space-constrained PCBs. |
| VCC range | 2.5 V to 5.5 V; compatible with 3.3 V and 5 V automotive supply rails without level-shifting. |
| Endurance | 1,000,000 erase/write cycles; supports frequent field updates such as adaptive learning parameters in ECU firmware. |
| Data retention | >200 years at +85°C; ensures long-term reliability across vehicle lifetime without refresh. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO); requires only 3 MCU GPIOs and no SPI hardware - ideal for legacy 8-bit controllers. |
| Temp grade | Automotive (E): −40°C to +125°C; qualified per AEC-Q100 stress test requirements for under-hood deployment. |
| Write time | 6 ms typical per byte (TWC); enables deterministic timing budgets for safety-critical write sequences. |
Pinout & Package
8-lead SOIC package (SN), Pb-free matte tin finish, 150 mil body width, standard JEDEC MS-012AC footprint. Pin 1 marked by laser dot; pin 1 ID corner confirmed per Microchip DS20001749K-page 18.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby (≤1 µA ICCS). |
| CLK | Serial Clock | Rising-edge synchronized I/O; clock frequency up to 3 MHz at VCC ≥4.5 V; stoppable mid-transfer for flexible MCU timing. |
| DI | Data Input | Accepts Start bit, opcode, address, and data; high-impedance when CS = low; no internal pull-up/down. |
| DO | Data Output / Status | Tri-state output: delivers read data or Ready/Busy (low = busy) - requires CS high ≥250 ns after TCSL to sample status. |
| VSS | Ground | Reference for all I/O and internal circuitry; must be connected directly to system ground plane. |
| NC | No Connection | Pin 7 is unconnected internally; must be left floating or tied to VSS per layout best practice - not used for ORG. |
| VCC | Power Supply | 2.5–5.5 V input; internal POR triggers at ~1.5 V; voltage detect ensures data integrity during brown-out. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing components or software delay loops - reduces BOM cost and firmware complexity. |
| Automatic ERAL before WRAL | Guarantees full-array erase prior to bulk write, preventing stale data corruption without explicit command sequencing. |
| Power-on/off data protection | Hardware-enforced write inhibition below VCC threshold (~1.5 V), preventing partial writes during power ramp-up/down. |
| Ready/Busy status on DO | Enables polled operation instead of fixed delays - improves real-time responsiveness and avoids unnecessary MCU wait states. |
| RoHS-compliant Pb-free packaging | Meets automotive environmental compliance (ELV Directive); SN package uses matte tin (Sn) finish, no lead content. |
Applications
| Engine Control Unit (ECU) | Instrument Cluster Calibration |
|---|---|
|
Use Scenario: Storing adaptive fuel trim values, misfire counters, and diagnostic trouble code (DTC) history across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to 8-bit MCU via Microwire - no SPI peripheral required. Use Value: 1M endurance supports daily reprogramming over 10+ years; automotive temp rating ensures operation near hot engine bay. |
Use Scenario: Retaining analog trim offsets for LCD contrast, backlight brightness, and gauge pointer zero-point compensation. IC Role / Device Role / Timing Role: Low-power serial EEPROM accessed during boot sequence to restore factory-calibrated display settings. Use Value: 200-year data retention eliminates recalibration needs over vehicle lifetime; 2.5 V min VCC supports start-stop battery voltage sag. |
| Body Control Module (BCM) | Tire Pressure Monitoring System (TPMS) |
|
Use Scenario: Holding user preferences (door lock behavior, mirror position, window auto-up/down settings) persistently across battery disconnects. IC Role / Device Role / Timing Role: Microwire EEPROM sharing GPIOs with other peripherals to minimize MCU pin count in cost-sensitive modules. Use Value: Fixed 8-bit organization simplifies firmware driver development; NC pin allows direct drop-in replacement of legacy 93LC46A parts. |
Use Scenario: Storing unique sensor ID mapping, pressure offset corrections, and low-battery event logs inside wheel-mounted TPMS transmitters. IC Role / Device Role / Timing Role: Ultra-low standby current (≤1 µA) extends coin-cell battery life; small SOIC-8 fits tight RF module PCB area. Use Value: Automotive temp range (−40°C to +125°C) covers extreme tire cavity temperatures; RoHS compliance meets global OEM sourcing mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46B-E/SN | 16-bit x64 organization (no ORG pin); identical VCC range, temp grade, and package. | Requires 16-bit MCU data path or firmware bit-packing; incompatible with existing 8-bit read/write routines. | Select only if system architecture mandates 16-bit word access and firmware can be modified to handle 16-bit opcodes and addressing. |
| AT25010B-MAHL-T | SPI interface (4-wire), 1 Kbit (128 × 8), 1.8–5.5 V, industrial temp only (−40°C to +85°C), same SOIC-8 package. | Lacks automotive qualification; requires dedicated SPI peripheral and additional CS line - increases MCU pin count. | Use only in non-automotive applications where SPI is preferred and extended temperature is not required. |
Compared with 93LC46B-E/SN and AT25010B-MAHL-T, the 93LC46CT-E/SN uniquely combines automotive qualification, Microwire compatibility (3-wire), and fixed 8-bit organization - making it the only drop-in solution for legacy automotive designs requiring AEC-Q100 compliance without hardware or firmware redesign.
Availability
93LC46CT-E/SN is available at Aetrix Electronics and suitable for engine control units, instrument cluster calibration, and body control modules requiring stable component supply across multi-year automotive production programs.
Supply support for 93LC46CT-E/SN 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 Microwire EEPROM product line, designed specifically for cost-sensitive, low-pin-count automotive and industrial systems requiring robust nonvolatile storage without SPI hardware dependency.
FAQ
What is the memory organization of the 93LC46CT-E/SN?
93LC46CT-E/SN has a fixed 128 × 8-bit (1 Kbit) organization with no ORG pin - unlike 'C' variants, it does not support word-size selection. This matches the 'A' version designation in Microchip's device selection table and ensures deterministic 8-bit data transfers without external configuration logic.
Does the 93LC46CT-E/SN require an external pull-up resistor on the DO pin?
No, the 93LC46CT-E/SN does not require an external pull-up on DO. The DO pin is actively driven high or low during read/status mode and enters High-Z state otherwise. However, a 10 kΩ pull-down on CS is recommended per Microchip's functional description to prevent spurious activation during power-up.
Can the 93LC46CT-E/SN be used in place of the 93LC46A-E/SN?
Yes, 93LC46CT-E/SN is functionally and pin-compatible with 93LC46A-E/SN - both are 8-bit, automotive-grade, SOIC-8 EEPROMs with identical pinout, timing, and instruction set. The 'T' suffix denotes tape-and-reel packaging; electrical and thermal specs are fully aligned per DS20001749K.
What is the minimum VCC required for reliable write operation of the 93LC46CT-E/SN?
The 93LC46CT-E/SN requires VCC ≥2.5 V for all operations, including write. Its internal voltage detect (VPOR) activates at ~1.5 V to inhibit writes during brown-out, but successful erase/write cycles demand ≥2.5 V per DC characteristics table D11 and AC timing conditions in Table 1-2.
How is Ready/Busy status checked on the 93LC46CT-E/SN?
Ready/Busy status is read from the DO pin: after initiating an erase or write command, hold CS low for ≥250 ns (TCSL), then bring CS high. DO = low indicates ongoing operation; DO = high means complete. This polling method replaces fixed delays and is specified in Section 2.4 and Figure 2-1 of DS20001749K.
93LC46CT-E/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC46CT-E/SN FAQ
1.How can I place an order for 93LC46CT-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46CT-E/SN 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-E/SN reliable?
The price and inventory of 93LC46CT-E/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC46CT-E/SN is usually 5 days.
3.What payment methods are accepted for 93LC46CT-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46CT-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46CT-E/SN?
93LC46CT-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46CT-E/SN 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-E/SN?
For technical support, including 93LC46CT-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46CT-E/SN requirements.
6.How does Aetrix verify that 93LC46CT-E/SN is sourced from the original manufacturer or authorized distributors?
All 93LC46CT-E/SN 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-E/SN meets industry standards.
7.What is the process for return or replacement of 93LC46CT-E/SN?
All 93LC46CT-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46CT-E/SN, 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-E/SN part is unused and in its original packaging.
Return procedure for 93LC46CT-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC46CT-E/SN 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…
