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Microchip Technology 93C86A-E/ST
- Part No.:
- 93C86A-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93C86A-E/ST.pdf
- Description:
- IC EEPROM 16KBIT MIC WIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,826
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Product details
Overview
93C86A-E/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 +125°C automotive temperature grade, and 1 million erase/write cycles. It serves as nonvolatile configuration storage in engine control units, airbag modules, and powertrain sensors where data integrity under thermal stress is critical.
For engineers reviewing the 93C86A-E/ST datasheet, 93C86A-E/ST pinout, 93C86A-E/ST application, or 93C86A-E/ST equivalent, key selection criteria include its automotive-grade temperature support, dedicated 8-bit organization (no ORG pin), absence of PE/ORG pins, and compatibility with legacy Microwire controllers requiring minimal firmware changes.
Technical Context
The 93C86A-E/ST implements a synchronous serial Microwire interface with CS, CLK, DI, and DO signals - no ORG or PE pins present. It uses self-timed erase/write cycles with automatic ERAL before WRAL, and supports sequential read via sustained CS high. Ready/Busy status is polled on DO during programming.
Its architecture enforces power-on data protection: write operations are inhibited below 3.8 V VCC, and the device powers up in EWDS (Erase/Write Disable) mode. All instructions require a Start bit (CS high + DI high on CLK rising edge), followed by opcode, address, and data bits clocked on CLK rising edges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 16 Kbit = 2048 × 8-bit organization; fixed x8 addressing simplifies controller firmware logic |
| VCC range | 4.5 V to 5.5 V; ensures reliable operation across automotive battery transients (e.g., load dump, cold crank) |
| Temperature grade | Automotive (E): -40°C to +125°C ambient; qualified for under-hood and transmission control applications |
| Endurance | 1,000,000 erase/write cycles; supports frequent calibration updates in adaptive systems |
| Data retention | 200 years at +85°C; guarantees long-term storage of safety-critical calibration constants |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO); interoperable with legacy microcontrollers without SPI conversion logic |
| Write time | 2 ms typical program cycle (TWC); enables fast field updates without blocking real-time tasks |
Pinout & Package
93C86A-E/ST is packaged in an 8-lead TSSOP (ST) with Pb-free Matte Tin finish. Pin 1 is marked by laser dot; package dimensions conform to JEDEC MO-153.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby (ICC ≤ 5 µA) |
| CLK | Serial Clock | Rising-edge synchronized I/O; clock can pause mid-transfer; no clocks required during self-timed write |
| DI | Data Input | Accepts Start bit, opcode (2-bit), address (11-bit), and data (8-bit); high-impedance when not selected |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge |
| VSS | Ground | Reference for all I/O and internal logic; requires low-impedance connection to minimize noise coupling |
| VCC | Power Supply | 4.5–5.5 V only; internal POR circuit blocks writes below 3.8 V to prevent corruption during brownout |
Key Features
| Feature | Design Value |
|---|---|
| Auto-erase before write | Eliminates need for separate erase command; reduces firmware complexity and total programming time |
| ERAL and WRAL commands | Enables full-array erase (6 ms) or full-array write (15 ms) with single instruction - critical for factory reprogramming |
| Power-on data protection | Hardware-enforced write inhibition below 3.8 V VCC prevents corruption during ignition cycling or battery faults |
| Ready/Busy polling | DO pin provides real-time status without requiring external timers or interrupts - simplifies host controller design |
| Low standby current | ≤5 µA at +125°C ensures minimal battery drain in always-on automotive modules |
Applications
| Engine Control Unit (ECU) | Airbag Deployment Module |
|---|---|
Use Scenario: Storing fuel trim tables, knock sensor adaptation values, and OBD-II diagnostic trouble codes that persist across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to ECU's 8-bit MCU via Microwire bus; accessed during initialization and runtime calibration. Use Value: 200-year data retention and 1M-cycle endurance ensure calibration stability over vehicle lifetime without field recalls. | Use Scenario: Holding crash-sensor offset compensation, deployment thresholds, and event logs for post-impact forensic analysis. IC Role / Device Role / Timing Role: Safety-critical parameter storage with automotive-grade (-40°C to +125°C) operation; accessed during pre-crash readiness checks. Use Value: Hardware write-protection below 3.8 V prevents corruption during cranking voltage sag, meeting ISO 16750-2 requirements. |
| Transmission Control Module (TCM) | Body Control Module (BCM) |
Use Scenario: Retaining gear ratio learning, shift timing maps, and adaptive clutch wear compensation across service intervals. IC Role / Device Role / Timing Role: Serial EEPROM used for adaptive learning storage; interfaced to TCM's 16-bit MCU with burst-read capability for fast map loading. Use Value: 2 ms write time enables real-time adaptation updates during coast-down events without interrupting control loops. | Use Scenario: Storing user preferences (window positions, mirror angles), lighting profiles, and door lock configurations. IC Role / Device Role / Timing Role: Low-power nonvolatile memory accessed infrequently via BCM's 8-bit MCU; operates in extended temperature range for under-dash mounting. Use Value: 5 µA max standby current at +125°C minimizes parasitic drain on 12 V battery during vehicle sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC86A-E/ST | VCC range 2.5–5.5 V; wider supply tolerance but lower immunity to 12 V transients | Suitable for mixed-signal modules with shared 3.3 V/5 V rails; not recommended for direct battery-connected nodes | Select if system uses regulated 3.3 V supply and requires broader voltage margin; verify transient immunity separately |
| AT25DF041A-SSH-T | SPI interface (4-wire), 4 Mbit density, sector erase, 2.7–3.6 V only | Requires SPI-capable host; higher density for firmware storage; incompatible pinout and protocol | Choose only when migrating to SPI infrastructure and needing >16 Kbit capacity; not drop-in compatible |
Compared with 93LC86A-E/ST, the 93C86A-E/ST offers superior voltage robustness for direct battery tie-in, while the AT25DF041A-SSH-T trades protocol compatibility for density and erase granularity - neither replaces 93C86A-E/ST without hardware or firmware redesign.
Availability
93C86A-E/ST is available at Aetrix Electronics and suitable for automotive powertrain control, airbag safety systems, and body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 93C86A-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, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.
The 93Cxx series was designed specifically for automotive and industrial applications demanding high reliability, extended temperature operation, and Microwire protocol compatibility - targeting cost-sensitive, safety-aware embedded systems.
FAQ
What is the maximum clock frequency supported by the 93C86A-E/ST?
The 93C86A-E/ST supports up to 3 MHz clock frequency when VCC is 4.5–5.5 V. This allows high-speed communication with host MCUs while maintaining timing margins for automotive EMI environments. The device remains functional at lower frequencies, enabling use with slower controllers or in noise-sensitive layouts where reduced CLK slew rates improve immunity.
Does the 93C86A-E/ST have an ORG or PE pin?
No, the 93C86A-E/ST does not include ORG or PE pins. As an 'A'-suffix device, it is fixed at 8-bit organization and lacks hardware write-protection logic. Programming is always enabled after issuing EWEN, and memory size is hardwired - simplifying PCB layout and eliminating external pull-up/down components required by 'C' variants.
How does the 93C86A-E/ST handle power-supply brownouts during write operations?
The 93C86A-E/ST incorporates a voltage detector that disables all write functions when VCC falls below 3.8 V. This prevents partial writes or data corruption during automotive cranking events. Once VCC recovers above threshold, the device resumes normal operation but retains its EWDS state - requiring explicit EWEN before next programming sequence.
Can the 93C86A-E/ST be used in place of a 93AA86A-I/ST in an existing design?
No - the 93C86A-E/ST is not a direct replacement for 93AA86A-I/ST due to differing temperature grades (E vs. I), VCC ranges (4.5–5.5 V vs. 1.8–5.5 V), and qualification testing. While pinout and instruction set are identical, substituting without requalification risks failure under automotive thermal and electrical stress conditions defined in AEC-Q100.
What packaging options are available for the 93C86A-E/ST besides TSSOP?
Per Microchip's DS21797L, the 93C86A-E/ST is offered in 8-lead PDIP (P), SOIC (SN), MSOP (MS), and TSSOP (ST) packages - all with automotive temperature grade and Pb-free Matte Tin finish. SOT-23 (OT) and DFN/TDFN variants are not available for the 'C86A' part number; those are reserved for 'AA' and 'LC' families.
93C86A-E/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
93C86A-E/ST FAQ
1.How can I place an order for 93C86A-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C86A-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 93C86A-E/ST reliable?
The price and inventory of 93C86A-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 93C86A-E/ST is usually 5 days.
3.What payment methods are accepted for 93C86A-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C86A-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C86A-E/ST?
93C86A-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C86A-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 93C86A-E/ST?
For technical support, including 93C86A-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C86A-E/ST requirements.
6.How does Aetrix verify that 93C86A-E/ST is sourced from the original manufacturer or authorized distributors?
All 93C86A-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 93C86A-E/ST meets industry standards.
7.What is the process for return or replacement of 93C86A-E/ST?
All 93C86A-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93C86A-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 93C86A-E/ST part is unused and in its original packaging.
Return procedure for 93C86A-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C86A-E/ST Tags
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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