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Microchip Technology 93C46AT-E/SN
- Part No.:
- 93C46AT-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93C46AT-E/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,906
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Product details
Overview
93C46AT-E/SN from Microchip Technology Inc. is a 1 Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, and industrial temperature grade (–40°C to +85°C). It features self-timed erase/write cycles, automatic erase-all-before-write-all (ERAL/WRAL), power-on/off data protection, and Ready/Busy status signaling via DO pin. Used for configuration storage in embedded controllers and sensor modules.
For engineers reviewing the 93C46AT-E/SN datasheet, 93C46AT-E/SN pinout, 93C46AT-E/SN application, or 93C46AT-E/SN equivalent, key selection criteria include voltage compatibility (4.5–5.5 V only), 8-bit fixed organization (no ORG pin), SOIC-8 package footprint, 2 ms write cycle time, and automotive-grade availability of functionally identical variants.
Technical Context
This device implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no internal clock generation or SPI mode support. Communication requires strict timing compliance: TCSL ≥ 250 ns, TCKH/TCKL down to 100 ns at 5.5 V, and status polling via DO during programming.
It uses CMOS EEPROM technology with 1 million erase/write cycles and >200-year data retention. Unlike 'C' variants, the 93C46A has no ORG pin and operates exclusively in 8-bit mode; its ERAL and WRAL operations require VCC ≥ 4.5 V and complete in 6 ms and 15 ms respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 words × 8 bits); supports single-byte or sequential read/write without address wrap. |
| VCC operating range | 4.5 V to 5.5 V only; below 4.5 V, all programming functions are inhibited and data protection activates. |
| Write cycle time | 2 ms typical; self-timed auto-erase-and-write eliminates need for external delay or busy-wait loops. |
| Endurance | 1,000,000 erase/write cycles at 25°C/5.0 V; verified per Total Endurance™ characterization model. |
| Data retention | Greater than 200 years at 85°C; enables long-life deployment in unattended industrial systems. |
| Interface protocol | Microwire-compatible 3-wire serial (CS/CLK/DI/DO); no SPI mode or dual-I/O support - strictly single-bit I/O. |
| Temperature grade | Industrial (I): –40°C to +85°C; not rated for automotive (E) grade despite E-temp availability in other 93C46 variants. |
Pinout & Package
93C46AT-E/SN is supplied in an 8-lead SOIC package (SN suffix), with 150-mil body width, gull-wing leads, and Pb-free Matte Tin (Sn) finish. Pin 1 is marked by laser dot or bevelled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby but allows ongoing write completion. |
| CLK | Serial Clock | Rising-edge synchronized I/O; clock can pause mid-transfer; no clock required during self-timed write cycle. |
| DI | Data Input | Accepts Start bit, opcode, address, and data; tied high with CS to initiate instruction sequence. |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge; status valid only after CS high ≥250 ns post-TCSL. |
| VSS | Ground | Reference for all logic and analog circuitry; must be low-impedance connection to avoid timing skew or corruption. |
| NC | No Internal Connection | Pin 7 in SOIC; electrically isolated - must remain unconnected or tied to VSS per layout best practice. |
| VCC | Power Supply | 4.5–5.5 V only; internal POR triggers at ~3.8 V; undershoot below threshold disables all writes and protects memory contents. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control - host MCU proceeds after CS deassertion without polling or fixed delays. |
| Automatic ERAL before WRAL | WRAL command internally executes full array erase prior to write, ensuring deterministic blank state without separate ERAL step. |
| Power-on/off data protection | Hardware-level lockout below 3.8 V prevents partial writes or corruption during brown-out or hot-plug events. |
| Ready/Busy status on DO | Enables efficient polling instead of blind waits; DO low indicates active programming, freeing CPU for other tasks. |
| 128 × 8-bit fixed organization | No ORG pin required - simplifies PCB routing and firmware; eliminates configuration dependency on external logic level. |
Applications
| Industrial Sensor Calibration | Embedded Controller Configuration |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients for analog sensor front-ends in HVAC or process control units. IC Role / Device Role / Timing Role: Nonvolatile parameter storage accessed at boot; read-only during runtime; write-once-per-lifetime calibration update. Use Value: Ensures consistent measurement accuracy across product lifetime without battery-backed RAM or external supervision. |
Use Scenario: Holding user-defined settings (baud rate, I/O mapping, alarm thresholds) in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Configuration register bank; updated infrequently via service port; retained across power cycles. Use Value: Enables field customization without firmware reflash; supports multiple machine variants from single BOM. |
| Power Supply Sequencing Log | Medical Device Audit Trail |
Use Scenario: Recording timestamped startup/fault events in AC-DC power modules for failure diagnostics. IC Role / Device Role / Timing Role: Event logger with circular buffer; writes triggered by hardware interrupt on fault detection. Use Value: Provides traceable root-cause data without requiring continuous RAM buffering or external flash management. |
Use Scenario: Storing device usage count, last self-test result, and firmware version in portable diagnostic tools. IC Role / Device Role / Timing Role: Regulatory-compliant audit memory; write-protected after initialization; read-accessible for service reports. Use Value: Meets IEC 62304 data integrity requirements with hardware-level write disable (EWDS) and voltage-based protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93C46BT-E/SN | 16-bit organization (64 × 16); same VCC range, timing, and package; ORG pin absent - fixed x16 mode. | Requires 16-bit data path alignment; incompatible with 8-bit firmware drivers unless rewritten for word access. | Select only if system uses 16-bit microcontroller bus or requires denser addressing with fewer address bits. |
| 93LC46AT-I/SN | Wider VCC range (2.5–5.5 V); same 8-bit organization and SOIC-8 package; identical pinout and instruction set. | Supports battery-powered or mixed-voltage designs; not qualified for 4.5–5.5 V-only systems where 93C46A's tighter spec ensures noise margin. | Preferred for low-power or multi-rail systems; verify VCC stability >2.5 V during all operational modes before substitution. |
Compared with 93C46BT-E/SN, the 93C46AT-E/SN offers simpler byte-aligned firmware integration; compared with 93LC46AT-I/SN, it provides higher noise immunity in 5 V logic environments but lacks low-voltage flexibility.
Availability
93C46AT-E/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded controller configuration, and power supply sequencing log applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 93C46AT-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 components, and nonvolatile memory solutions, headquartered in Chandler, Arizona.
The 93Cxx series was designed specifically for cost-sensitive, low-pin-count embedded systems needing reliable, low-power serial EEPROM with Microwire compatibility and robust data retention.
FAQ
What is the minimum VCC voltage required for reliable operation of the 93C46AT-E/SN?
The 93C46AT-E/SN requires a minimum VCC of 4.5 V for all functional operation. Below this threshold - specifically below ~3.8 V - the internal voltage detector disables erase and write commands to prevent data corruption. Read operations may still function intermittently but are not guaranteed. This behavior is hardwired and cannot be overridden in firmware.
Does the 93C46AT-E/SN have an ORG pin, and what memory organization does it support?
No, the 93C46AT-E/SN does not have an ORG pin and supports only 8-bit organization (128 × 8-bit). It belongs to the 'A' variant family, which is fixed x8 - unlike 'C' variants that use ORG to select between x8/x16 modes. This eliminates external configuration logic and simplifies PCB layout and driver development.
How long does a write cycle take for the 93C46AT-E/SN, and how is completion signaled?
A write cycle for the 93C46AT-E/SN takes 2 ms maximum. Completion is signaled via the DO pin: when CS is brought high after ≥250 ns low time (TCSL), DO goes low during programming and returns high when complete. The device enters High-Z state on CS falling edge, so status polling must occur while CS is high.
Can the 93C46AT-E/SN be used in automotive applications?
The 93C46AT-E/SN is rated for Industrial temperature range (–40°C to +85°C) only. While the 'E' suffix in the part number denotes automotive qualification for *other* variants (e.g., 93C46BT-E/SN), the 'T-E' in 93C46AT-E/SN refers to tape-and-reel packaging and Industrial temp grade. For automotive use, select 93C46BT-E/SN or 93C46CT-E/SN with explicit E-temp rating.
What is the purpose of the NC pin (Pin 7) on the 93C46AT-E/SN SOIC package?
Pin 7 on the 93C46AT-E/SN is designated NC (No Connection) - it has no internal bond wire or circuit connection. It must remain unconnected in the PCB layout. Microchip recommends avoiding routing traces under or adjacent to this pin to prevent parasitic coupling, though tying it to VSS is acceptable if needed for mechanical stability or thermal relief.
93C46AT-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:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Kbit
- Memory Organization:
- 128 x 8
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 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-SOIC
93C46AT-E/SN FAQ
1.How can I place an order for 93C46AT-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46AT-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 93C46AT-E/SN reliable?
The price and inventory of 93C46AT-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 93C46AT-E/SN is usually 5 days.
3.What payment methods are accepted for 93C46AT-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46AT-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46AT-E/SN?
93C46AT-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46AT-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 93C46AT-E/SN?
For technical support, including 93C46AT-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46AT-E/SN requirements.
6.How does Aetrix verify that 93C46AT-E/SN is sourced from the original manufacturer or authorized distributors?
All 93C46AT-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 93C46AT-E/SN meets industry standards.
7.What is the process for return or replacement of 93C46AT-E/SN?
All 93C46AT-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93C46AT-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 93C46AT-E/SN part is unused and in its original packaging.
Return procedure for 93C46AT-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C46AT-E/SN Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
Microchip Technology
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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