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Microchip Technology 93C86AT-I/ST
- Part No.:
- 93C86AT-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93C86AT-I/ST.pdf
- Description:
- IC EEPROM 16KBIT MIC WIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,046
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Product details
Overview
93C86AT-I/ST from Microchip Technology Inc. is a 16 Kbit (2048 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, -40°C to +85°C industrial temperature grade, and TSSOP-8 package. It provides nonvolatile storage for configuration data in microcontroller-based systems requiring robust write-protection and long-term data retention.
For engineers reviewing the 93C86AT-I/ST datasheet, 93C86AT-I/ST pinout, 93C86AT-I/ST application, or 93C86AT-I/ST equivalent, key selection criteria include its dedicated 8-bit organization (no ORG pin), absence of PE/ORG pins, 2 ms erase/write cycle time, 1 million endurance cycles, and compatibility with legacy Microwire controllers in space-constrained industrial control and sensor modules.
Technical Context
This device implements a synchronous serial interface using CS, CLK, and DI/DO lines with start-bit detection and opcode-driven command execution. It supports READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions - all clocked on CLK rising edges, with DO providing Ready/Busy status during programming via CS-controlled polling.
Power-on data protection is enforced by a 3.8 V VCC detect threshold; below this voltage, all operations are inhibited. The device powers up in EWDS mode, requiring explicit EWEN before any write/erase, and supports sequential read when CS remains high across address boundaries.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 16 Kbit (2048 × 8-bit) - fixed x8 organization; no ORG pin; no word-size reconfiguration |
| VCC range | 4.5 V to 5.5 V - requires stable 5 V rail; not compatible with 3.3 V or mixed-voltage systems |
| Write cycle time | 2 ms - self-timed erase+write; enables deterministic firmware timeout handling without external delay |
| Endurance | 1,000,000 write/erase cycles - supports frequent calibration or logging in field-deployed equipment |
| Data retention | >200 years at 85°C - ensures configuration integrity over full product lifecycle in industrial environments |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy PIC® MCU peripherals and discrete shift-register controllers |
| Temperature grade | Industrial: -40°C to +85°C - qualified for use in motor drives, PLC I/O modules, and HVAC controllers |
Pinout & Package
8-pin TSSOP (Thin Shrink Small Outline Package), Pb-free Matte Tin finish, 3.0 mm × 4.4 mm body, 0.65 mm pitch. Pin 1 marked by laser dot; moisture sensitivity level (MSL) 3 per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable; must be held low ≥250 ns between commands; controls Standby entry and DO status availability |
| 2 CLK | Serial Clock | Positive-edge synchronous timing; max 3 MHz @ 4.5–5.5 V; stoppable mid-transfer for master flexibility |
| 3 DI | Data Input | Receives start bit, opcodes, addresses, and write data; shares net with DO only with series resistor to prevent bus conflict |
| 4 DO | Data Output / Status | Tri-state output; delivers read data or Ready/Busy (low = busy); enters High-Z on CS falling edge |
| 5 VSS | Ground | Reference return for all signals; must be low-impedance connection to minimize noise coupling into serial interface |
| 6 - | No connect | Not bonded; electrically isolated; no PCB trace required |
| 7 - | No connect | Not bonded; electrically isolated; no PCB trace required |
| 8 VCC | Power Supply | 4.5–5.5 V input; requires local 100 nF ceramic decoupling placed within 3 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing circuitry or software wait states - simplifies firmware integration |
| Automatic ERAL before WRAL | Ensures full-array write reliability without separate erase command - reduces command sequence overhead |
| Power-on/off data protection | Hardware-enforced lockout below 3.8 V VCC - prevents corruption during brown-out or hot-swap events |
| Ready/Busy polling via DO | Enables non-blocking operation in interrupt-driven systems - avoids fixed delays and improves real-time response |
| 100% tested E/W cycle specification | Guarantees minimum 1M endurance under rated conditions - supports lifetime reliability modeling for safety-critical systems |
Applications
| Motor Control Configuration Storage | Industrial Sensor Calibration Data |
|---|---|
Use Scenario: Storing PID coefficients, current limits, and commutation tables in BLDC motor drives where firmware updates occur infrequently but settings must survive power loss. IC Role / Device Role / Timing Role: Nonvolatile parameter store interfaced directly to PIC18F or dsPIC33 MCU SPI/Microwire peripheral; accessed during boot or service mode. Use Value: Eliminates battery-backed SRAM; guarantees 200+ year retention of critical tuning data without maintenance. | Use Scenario: Holding factory-calibrated offset/gain values and linearization coefficients for analog temperature or pressure sensors in process automation transmitters. IC Role / Device Role / Timing Role: Dedicated configuration memory mapped via GPIO-banged Microwire; read once at startup, then cached in RAM. Use Value: Enables single-pass calibration during manufacturing; removes need for external trim pots or laser trimming. |
| PLC I/O Module Identity & Settings | Medical Device Usage Logs |
Use Scenario: Storing module type ID, channel count, isolation rating, and user-defined scaling factors in DIN-rail mounted programmable logic controller I/O cards. IC Role / Device Role / Timing Role: System-level identity register accessed by host controller during backplane enumeration; updated only during firmware upgrade. Use Value: Allows field-replaceable modules to auto-configure host firmware without manual dip-switch setup. | Use Scenario: Recording cumulative operating hours, error counters, and last-service timestamps in Class II medical infusion pumps subject to FDA 21 CFR Part 11 audit requirements. IC Role / Device Role / Timing Role: Tamper-resistant event logger written infrequently (e.g., every 10,000 hours); verified via CRC before each write. Use Value: Meets regulatory traceability mandates with hardware-enforced data integrity and guaranteed 200-year retention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC86AT-I/ST | 2.5–5.5 V VCC range; same 2048×8 organization; identical TSSOP-8 package and pinout | Supports 3.3 V systems; lacks 3.8 V POR threshold - requires external brown-out detection for safe 3.3 V operation | Select when migrating to lower-voltage MCU platforms while retaining layout and firmware compatibility |
| AT25080B-MAHL-T | SPI interface (4-wire), 8 Kbit (1024×8), 2.5–5.5 V, SOIC-8 package; no Ready/Busy pin - uses WIP flag in status register | Requires SPI peripheral instead of Microwire; smaller capacity; different timing model and command set | Select when SPI is already used elsewhere in design and 8 Kbit suffices; verify firmware driver compatibility |
Compared with 93LC86AT-I/ST, the 93C86AT-I/ST offers higher VCC noise immunity and guaranteed operation only above 4.5 V - ideal for noisy 5 V industrial rails. Versus AT25080B-MAHL-T, it retains Microwire simplicity and deterministic 2 ms write timing but lacks SPI standardization and status register access.
Availability
93C86AT-I/ST is available at Aetrix Electronics and suitable for industrial control systems, sensor calibration modules, and PLC I/O hardware requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93C86AT-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 93Cxx family was designed specifically for cost-sensitive, low-power industrial and automotive applications requiring reliable serial EEPROM with Microwire compatibility and robust data integrity features.
FAQ
What is the memory organization of the 93C86AT-I/ST?
The 93C86AT-I/ST has a fixed 2048 × 8-bit (16 Kbit) organization. Unlike 'C' variants, it lacks an ORG pin and cannot be configured for 16-bit words - it operates exclusively in x8 mode with 11-bit addressing (A10–A0).
Does the 93C86AT-I/ST have a Program Enable (PE) pin?
No, the 93C86AT-I/ST does not include a PE pin. As an 'A' variant, it has no hardware write-protection pin - write-enable state is controlled solely by the EWEN/EWDS instruction sequence, not by external logic levels.
What is the maximum clock frequency supported by the 93C86AT-I/ST?
The 93C86AT-I/ST supports up to 3 MHz clock frequency when VCC is 4.5–5.5 V. At lower voltages (not applicable here), timing de-rates - but since this part is specified only for 4.5–5.5 V, 3 MHz is its guaranteed maximum operational rate.
How is data protection implemented during power transitions in the 93C86AT-I/ST?
The 93C86AT-I/ST incorporates a voltage-detect circuit that inhibits all operations when VCC falls below 3.8 V. This prevents partial writes or corruption during brown-out or power-down sequences, ensuring data integrity without requiring external supervisor ICs.
Can the 93C86AT-I/ST be used in place of a 93AA86AT-I/ST?
No - the 93C86AT-I/ST and 93AA86AT-I/ST differ in VCC range (4.5–5.5 V vs. 1.8–5.5 V) and power-on reset threshold (3.8 V vs. 1.5 V). Substituting them risks functional failure in low-voltage operation or improper brown-out protection, even though both are 2048×8 'A' variants.
93C86AT-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:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 16Kbit
- Memory Organization:
- 2K x 8
- Memory Interface:
- Microwire
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 2ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
93C86AT-I/ST FAQ
1.How can I place an order for 93C86AT-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C86AT-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 93C86AT-I/ST reliable?
The price and inventory of 93C86AT-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 93C86AT-I/ST is usually 5 days.
3.What payment methods are accepted for 93C86AT-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C86AT-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C86AT-I/ST?
93C86AT-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C86AT-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 93C86AT-I/ST?
For technical support, including 93C86AT-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C86AT-I/ST requirements.
6.How does Aetrix verify that 93C86AT-I/ST is sourced from the original manufacturer or authorized distributors?
All 93C86AT-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 93C86AT-I/ST meets industry standards.
7.What is the process for return or replacement of 93C86AT-I/ST?
All 93C86AT-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93C86AT-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 93C86AT-I/ST part is unused and in its original packaging.
Return procedure for 93C86AT-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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