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Microchip Technology 93C86AT-E/ST
- Part No.:
- 93C86AT-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93C86AT-E/ST.pdf
- Description:
- IC EEPROM 16KBIT MIC WIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,219
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Product details
Overview
93C86AT-E/ST from Microchip Technology Inc. is a 16 Kbit (2048 × 8-bit) Microwire-compatible serial EEPROM designed for nonvolatile data storage in embedded systems. It operates within a 4.5–5.5 V supply range, supports Industrial and Automotive temperature grades (−40°C to +125°C), features self-timed erase/write cycles, and delivers 1,000,000 endurance cycles with >200-year data retention. It is commonly used in microcontroller configuration storage and sensor calibration parameter retention.
For engineers reviewing the 93C86AT-E/ST datasheet, 93C86AT-E/ST pinout, 93C86AT-E/ST application, or 93C86AT-E/ST equivalent, this page provides verified electrical specifications, package mapping to 8-lead TSSOP (ST), functional timing behavior, real-world use scenarios, and two validated alternative parts for design flexibility under automotive-grade voltage and temperature constraints.
Technical Context
The 93C86AT-E/ST implements a synchronous 3-wire Microwire interface (CS, CLK, DI/DO) with dedicated Read/Write/Erase/ERAL/WRAL instruction set. It uses internal auto-erase before write and supports sequential read mode when CS remains high.
Unlike 'C' variants, this 'A' version lacks ORG and PE pins-memory organization is fixed at 8-bit, and write protection requires external logic or firmware control. Ready/Busy status is signaled via DO pin during programming, requiring CS low-to-high transition ≥250 ns before polling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 16 Kbit (2048 × 8-bit) - fixed x8 organization; no ORG pin support |
| VCC Range | 4.5 V to 5.5 V - restricts use to 5 V systems; not compatible with 3.3 V or lower rails |
| Endurance | 1,000,000 erase/write cycles - enables long-term field calibration updates without wear-out concerns |
| Data Retention | >200 years at +85°C - ensures firmware or configuration data integrity over full product lifecycle |
| Write Cycle Time | 2 ms typical - defines minimum interval between successive WRITE commands |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| Interface | Microwire 3-wire serial (CS/CLK/DI/DO) - requires no additional level-shifting in 5 V MCU designs |
Pinout & Package
8-lead TSSOP (ST) package per Microchip DS21797L, Pb-free Matte Tin finish, 3.0 mm × 4.4 mm body, 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions to reset internal state |
| 2 CLK | Serial Clock | Rising-edge synchronized I/O; clocking stops during self-timed write; TCKH/TCKL vary with VCC |
| 3 DI | Data Input | Accepts Start bit, opcode, address, and data; tied high with CS on first CLK rising edge to initiate command |
| 4 DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge |
| 5 VSS | Ground | Reference for all digital and analog functions; requires low-impedance connection to system GND plane |
| 6 - | No Connect | Pin 6 is unassigned in 93C86A; not bonded - must remain floating or grounded per layout best practice |
| 7 - | No Connect | Pin 7 is unassigned in 93C86A; not bonded - must remain floating or grounded per layout best practice |
| 8 VCC | Power Supply | 4.5–5.5 V only; internal POR triggers at ~3.8 V; operation inhibited below threshold |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for external timing control or software delay loops; cycle completion signaled via DO pin |
| Automatic ERAL before WRAL | Ensures full-array write reliability without separate erase command; reduces firmware complexity |
| Power-On/Off Data Protection | Hardware-level inhibition of writes when VCC drops below 3.8 V; prevents corruption during brownout |
| Ready/Busy Status Signal | Enables polling-based firmware flow control instead of fixed delays - improves system responsiveness |
| Sequential Read Mode | Reduces transaction overhead by streaming consecutive bytes with single CS assertion |
Applications
| Engine Control Unit (ECU) Trim Storage | Industrial PLC Configuration Memory |
|---|---|
Use Scenario: Storing fuel injection timing offsets and sensor bias corrections updated during vehicle calibration. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed infrequently but requiring guaranteed retention across 15+ year service life. Use Value: 1M endurance and >200-year retention ensure calibration data survives entire vehicle lifetime without refresh. | Use Scenario: Holding I/O mapping tables and alarm thresholds in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Serial configuration store interfaced directly to 5 V microcontroller GPIO with minimal external components. Use Value: Microwire compatibility and 4.5–5.5 V operation eliminate level shifters and simplify BOM in legacy 5 V control systems. |
| Automotive Body Controller Settings | Medical Device Calibration Data |
Use Scenario: Retaining window position limits, mirror fold settings, and lighting profiles in automotive body control modules. IC Role / Device Role / Timing Role: Low-pin-count EEPROM supporting robust communication over noisy chassis ground with CS/CLK/DI/DO isolation. Use Value: −40°C to +125°C qualification and built-in power-loss protection prevent setting corruption during cold cranking or thermal cycling. | Use Scenario: Storing sensor gain/offset coefficients and regulatory compliance logs in portable diagnostic equipment. IC Role / Device Role / Timing Role: Tamper-resistant configuration memory where data integrity is mandated by IEC 62304. Use Value: Hardware write-inhibit during brownout and 1M-cycle endurance meet medical device reliability requirements for field updates. |
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 | Wider VCC range (2.5–5.5 V); same 8-bit organization and TSSOP-8 package; rated for −40°C to +85°C only | Suitable for commercial/industrial 3.3 V or 5 V systems; not qualified for automotive under-hood use | Select if operating voltage may drop below 4.5 V or ambient stays ≤+85°C; verify power-rail stability during startup. |
| AT25DF021-SSH-T | 2 Mbit SPI NOR Flash; quad I/O capable; 2.7–3.6 V operation; no built-in erase-before-write; requires sector erase management | Higher density and faster random access; requires driver layer for erase/write sequencing and wear leveling | Choose for larger configuration space or faster read throughput; accept added firmware complexity and voltage incompatibility. |
Compared with 93LC86AT-I/ST, the 93C86AT-E/ST trades wider voltage tolerance for automotive temperature rating; versus AT25DF021-SSH-T, it offers simpler command protocol and guaranteed write endurance at the cost of density and speed.
Availability
93C86AT-E/ST is available at Aetrix Electronics and suitable for automotive body control units, industrial programmable logic controllers, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 93C86AT-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 devices, and memory solutions, serving automotive, industrial, and consumer markets with high-reliability silicon and development tools.
The 93Cxx series targets cost-sensitive, low-pin-count nonvolatile storage needs in resource-constrained embedded systems, emphasizing simplicity, robustness, and long-term data integrity over high speed or density.
FAQ
What is the memory organization of the 93C86AT-E/ST?
The 93C86AT-E/ST is an 'A' variant with fixed 2048 × 8-bit (16 Kbit) organization. It does not include an ORG pin, so word size cannot be reconfigured - unlike 'C' versions, it exclusively supports x8 access. This simplifies hardware design by eliminating external ORG logic and guarantees deterministic addressing for firmware drivers.
Does the 93C86AT-E/ST support 3.3 V operation?
No, the 93C86AT-E/ST requires a minimum VCC of 4.5 V and operates up to 5.5 V only. It is incompatible with 3.3 V systems. Attempting to power it at 3.3 V will inhibit all operations due to internal voltage detection (~3.8 V threshold). For 3.3 V designs, consider the 93LC86AT-I/ST (2.5–5.5 V range) instead.
How is write protection implemented on the 93C86AT-E/ST?
The 93C86AT-E/ST lacks a Program Enable (PE) pin - unlike 'C' variants, it has no hardware write-enable control. Write protection must be implemented in firmware using EWEN/EWDS commands: the device powers up in EWDS mode, and an explicit EWEN instruction is required before any ERASE or WRITE. After programming, issue EWDS to re-lock.
What package type does the 93C86AT-E/ST use?
93C86AT-E/ST uses an 8-lead TSSOP (Thin Shrink Small Outline Package), designated 'ST' in Microchip's packaging nomenclature. It measures 3.0 mm × 4.4 mm with 0.65 mm lead pitch, Pb-free Matte Tin finish, and is qualified for automotive temperature range (−40°C to +125°C).
Can the 93C86AT-E/ST be used in place of a 93AA86AT-I/ST?
No - the 93C86AT-E/ST and 93AA86AT-I/ST differ in voltage range (4.5–5.5 V vs. 1.8–5.5 V), temperature grade (E vs. I), and internal power-on reset threshold (3.8 V vs. 1.5 V). Swapping them risks functional failure during low-VCC conditions or elevated temperatures beyond +85°C. They share pinout and instruction set but are not drop-in replacements.
93C86AT-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
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
93C86AT-E/ST FAQ
1.How can I place an order for 93C86AT-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C86AT-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 93C86AT-E/ST reliable?
The price and inventory of 93C86AT-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 93C86AT-E/ST is usually 5 days.
3.What payment methods are accepted for 93C86AT-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C86AT-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C86AT-E/ST?
93C86AT-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C86AT-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 93C86AT-E/ST?
For technical support, including 93C86AT-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C86AT-E/ST requirements.
6.How does Aetrix verify that 93C86AT-E/ST is sourced from the original manufacturer or authorized distributors?
All 93C86AT-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 93C86AT-E/ST meets industry standards.
7.What is the process for return or replacement of 93C86AT-E/ST?
All 93C86AT-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93C86AT-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 93C86AT-E/ST part is unused and in its original packaging.
Return procedure for 93C86AT-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C86AT-E/ST Tags
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