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Microchip Technology 93LC86CT-E/ST
- Part No.:
- 93LC86CT-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93LC86CT-E/ST.pdf
- Description:
- IC EEPROM 16KBIT MIC WIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,476
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Product details
Overview
93LC86CT-E/ST from Microchip Technology Inc. is a 16 Kbit Microwire-compatible serial EEPROM with configurable 8-/16-bit word organization via the ORG pin, 2.5–5.5 V supply range, industrial and automotive temperature support (−40°C to +125°C), and integrated Program Enable (PE) pin for hardware write protection. It is used in embedded systems for storing calibration data, configuration parameters, and firmware boot settings.
For engineers reviewing the 93LC86CT-E/ST datasheet, 93LC86CT-E/ST pinout, 93LC86CT-E/ST application, or 93LC86CT-E/ST equivalent, key selection criteria include voltage compatibility (2.5–5.5 V), automotive-grade operation (−40°C to +125°C), ORG-selectable memory width, PE-enabled hardware write lockout, and Microwire interface timing compliance at up to 3 MHz.
Technical Context
The 93LC86CT-E/ST implements a synchronous 3-wire Microwire interface (CS, CLK, DI/DO) with self-timed erase/write cycles, automatic ERAL before WRAL, and Ready/Busy status polling via DO. Its dual-word-size architecture relies on external logic applied to the ORG pin to select either 2048 × 8-bit or 1024 × 16-bit organization.
Write operations require prior EWEN command execution and a high logic level on the PE pin; programming is inhibited if PE = VSS. Power-on/off data protection activates below 1.5 V, and the device supports sequential read, ERAL, WRAL, and status polling without external timing control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 16 Kbit (2048 × 8 or 1024 × 16, selectable via ORG pin) |
| Supply voltage | 2.5–5.5 V - supports wide-range industrial and automotive power rails |
| Temperature grade | −40°C to +125°C (Automotive E-temp) - qualified for under-hood and safety-critical applications |
| Interface | Microwire 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage, no SPI mode pins required |
| Write endurance | 1,000,000 erase/write cycles - suitable for frequent field updates and logging |
| Data retention | >200 years at +25°C - ensures long-term reliability in unpowered storage |
| Max clock frequency | 3 MHz at VCC ≥ 4.5 V - enables fast configuration loading during system boot |
Pinout & Package
Package: 8-lead TSSOP (ST), Pb-free Matte Tin finish, 4.4 mm × 3.0 mm body, 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; controls Standby entry/exit |
| CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks opcode/address/data; stoppable mid-sequence |
| DI | Data Input | Accepts Start bit, opcode, address, and write data; shares net with DO in bidirectional configurations |
| DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS low or after status read |
| VSS | Ground | Reference for all I/O and internal circuitry; must be low-impedance connection |
| ORG | Organization Select | High = 1024 × 16-bit; low = 2048 × 8-bit; must be hardwired, not floated |
| PE | Program Enable | High = write enabled; low = full array write-protection; mandatory for WRITE/WRAL execution |
| VCC | Power Supply | 2.5–5.5 V input; internal POR triggers at ~1.5 V; powers all logic and memory cells |
Key Features
| Feature | Design Value |
|---|---|
| Hardware write protection | PE pin provides unconditional, pin-level disable of all erase/write functions - eliminates software-only vulnerabilities |
| Configurable word size | Single device supports both 8-bit and 16-bit bus architectures via ORG pin - reduces BOM count across product variants |
| Auto-erase/write cycle | No external timing or polling overhead needed - simplifies firmware implementation and reduces CPU load |
| Power-on/off data protection | Internal circuitry blocks writes when VCC < 1.5 V - prevents corruption during brown-out or hot-swap events |
| Ready/Busy status signaling | DO pin doubles as status indicator - enables real-time progress monitoring without extra GPIO or interrupts |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing fuel map coefficients, sensor calibration offsets, and fault log history in an engine management system operating under under-hood thermal stress. IC Role / Device Role / Timing Role: Nonvolatile parameter store interfaced directly to MCU's Microwire peripheral; accessed during startup and runtime reconfiguration. Use Value: Automotive temperature rating (−40°C to +125°C) and 1M-cycle endurance ensure reliable recalibration over 15+ year vehicle lifetime. | Use Scenario: Retaining I/O mapping tables, PID tuning constants, and user-defined ladder logic parameters across power cycles in modular automation controllers. IC Role / Device Role / Timing Role: Dedicated configuration EEPROM connected to main controller via 3-wire bus; updated only during commissioning or firmware upgrade. Use Value: Hardware PE pin prevents accidental overwrite during field service or electromagnetic interference events in noisy factory environments. |
| Medical Infusion Pump Settings | Smart Meter Firmware Bootloader Data |
Use Scenario: Securing drug dosage limits, alarm thresholds, and operator access levels in battery-powered portable medical devices requiring regulatory traceability. IC Role / Device Role / Timing Role: Tamper-resistant storage for safety-critical parameters; accessed only by authenticated firmware routines. Use Value: >200-year data retention and RoHS-compliant packaging meet ISO 13485 and IEC 62304 requirements for Class IIb devices. | Use Scenario: Holding cryptographic keys, meter serial ID, tariff tables, and firmware signature hashes in utility smart meters deployed in outdoor enclosures. IC Role / Device Role / Timing Role: Secure boot data repository interfaced to secure MCU; verified before executing application code. Use Value: ORG-selectable 16-bit mode optimizes read bandwidth for hash verification; 2.5 V minimum VCC supports wide-input DC-DC converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC86C-I/ST | Same pinout and functionality, but rated for −40°C to +85°C only (Industrial grade) | Lacks automotive temperature qualification; unsuitable for under-hood or safety-critical deployments | Select only for cost-sensitive non-automotive designs where extended temperature range is unnecessary |
| AT25DF041A-SSH-T | Quad SPI Flash (4 Mbit), not Microwire EEPROM; requires different driver stack and lacks PE/ORG pins | Higher density but no hardware write protection or word-size flexibility; incompatible instruction set | Consider only if migrating to SPI-based architecture and accepting firmware redesign effort |
Compared with 93LC86C-I/ST, the 93LC86CT-E/ST adds automotive qualification and identical feature set; compared with AT25DF041A-SSH-T, it offers guaranteed Microwire compatibility, hardware write lock, and seamless drop-in replacement in legacy 3-wire designs.
Availability
93LC86CT-E/ST is available at Aetrix Electronics and suitable for automotive ECU development, industrial PLC configuration storage, and medical device parameter retention requiring stable component supply across long production lifecycles.
Supply support for 93LC86CT-E/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 components, and memory solutions, serving automotive, industrial, and consumer markets with high-reliability silicon and design tools.
The 93LC86CT-E/ST belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for low-pin-count, low-power, and high-reliability nonvolatile storage in resource-constrained embedded systems.
FAQ
What is the function of the ORG pin on the 93LC86CT-E/ST?
The ORG pin on the 93LC86CT-E/ST selects memory organization: tied to VCC for 1024 × 16-bit mode, or to VSS for 2048 × 8-bit mode. This pin is mandatory for configuration and must not be left floating. The 93LC86CT-E/ST uses this pin to dynamically adapt to host processor bus width without changing hardware layout - a key advantage over fixed-organization EEPROMs like the 93LC86A/B variants.
Does the 93LC86CT-E/ST require external pull-up resistors on its I/O lines?
The 93LC86CT-E/ST does not require external pull-ups on CS, CLK, or DI for basic operation, as internal weak pull-downs exist on some pins per functional description. However, a 10 kΩ external pull-down on CS is recommended per Microchip application guidance to prevent spurious start conditions during power-up. DO is actively driven or High-Z; no pull-up is needed unless shared with DI in bidirectional mode, where a series resistor is advised to avoid bus conflict.
How does the Program Enable (PE) pin protect memory on the 93LC86CT-E/ST?
The PE pin on the 93LC86CT-E/ST acts as a hardware gate for all write operations: only when PE = VCC can EWEN, ERASE, WRITE, or WRAL commands execute. If PE = VSS, all programming functions are disabled regardless of software state. This provides fail-safe protection against firmware bugs, EMI-induced glitches, or unauthorized access - a critical feature absent in A/B variants and essential for automotive and medical use of the 93LC86CT-E/ST.
What is the maximum clock frequency supported by the 93LC86CT-E/ST at 3.3 V supply?
At VCC = 3.3 V, the 93LC86CT-E/ST supports a maximum clock frequency of 2 MHz, as specified in Table 1-2 (A1). This is lower than the 3 MHz limit at ≥4.5 V but sufficient for most configuration-read and infrequent-write applications. Timing margins remain robust due to guaranteed min/max values for TCKH (250 ns), TCKL (200 ns), and TPD (250 ns) across the full 2.5–5.5 V range.
Can the 93LC86CT-E/ST be used as a direct replacement for the 93LC86B-I/ST?
No - the 93LC86CT-E/ST is not a direct replacement for the 93LC86B-I/ST. While both are 16 Kbit EEPROMs in ST packages, the 93LC86B-I/ST has fixed 16-bit organization (no ORG pin) and no PE pin, whereas the 93LC86CT-E/ST requires ORG and PE connections and supports dual-word-size operation. Pinout differs: 93LC86B-I/ST uses pins 6 and 7 for NC, while 93LC86CT-E/ST assigns them to ORG and PE. PCB layout change is required.
93LC86CT-E/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:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 16Kbit
- Memory Organization:
- 2K x 8, 1K x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 5ms
- 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-TSSOP
93LC86CT-E/ST FAQ
1.How can I place an order for 93LC86CT-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC86CT-E/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 93LC86CT-E/ST reliable?
The price and inventory of 93LC86CT-E/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC86CT-E/ST is usually 5 days.
3.What payment methods are accepted for 93LC86CT-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC86CT-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC86CT-E/ST?
93LC86CT-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC86CT-E/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 93LC86CT-E/ST?
For technical support, including 93LC86CT-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC86CT-E/ST requirements.
6.How does Aetrix verify that 93LC86CT-E/ST is sourced from the original manufacturer or authorized distributors?
All 93LC86CT-E/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 93LC86CT-E/ST meets industry standards.
7.What is the process for return or replacement of 93LC86CT-E/ST?
All 93LC86CT-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93LC86CT-E/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 93LC86CT-E/ST part is unused and in its original packaging.
Return procedure for 93LC86CT-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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