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Microchip Technology 93C46BT-E/SN
- Part No.:
- 93C46BT-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93C46BT-E/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,659
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Product details
Overview
93C46BT-E/SN from Microchip Technology Inc. is a 1Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, and industrial-temperature operation (−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 - deployed in embedded system configuration storage for microcontrollers.
For engineers reviewing the 93C46BT-E/SN datasheet, 93C46BT-E/SN pinout, 93C46BT-E/SN application, or 93C46BT-E/SN equivalent, key selection considerations include voltage compatibility (4.5–5.5 V only), absence of ORG pin (fixed 8-bit organization), SOIC-8 packaging, TSSOP-compatible marking ('T' suffix), and automotive-grade qualification (E-temp not applicable - 'T' denotes tape-and-reel, 'E' is separate temp grade).
Technical Context
This device implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins. It operates exclusively in 8-bit mode (no ORG pin), requiring 18 clock cycles for READ/WRITE instructions and supporting sequential read. Internal logic enforces EWEN/EWDS write-protection states, and all programming cycles are self-timed with hardware-initiated auto-erase.
Power-on reset circuitry disables writes below 3.8 V (VPOR), and Ready/Busy status is sampled by polling DO after CS high assertion ≥250 ns post-CS low. Timing parameters are voltage- and temperature-dependent: max clock frequency is 3 MHz at VCC ≥4.5 V, with TWC = 2 ms for erase/write cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit) - fixed x8 organization; no ORG pin; supports 128-byte configuration storage. |
| VCC range | 4.5 V to 5.5 V - incompatible with 3.3 V or 2.5 V systems; POR threshold at 3.8 V prevents corruption during brown-out. |
| Clock frequency | Up to 3 MHz at VCC ≥4.5 V - enables fast configuration reads in real-time firmware initialization. |
| Write cycle time | 2 ms typical - deterministic self-timed erase+write eliminates need for software delay loops. |
| Endurance & retention | 1,000,000 erase/write cycles; >200 years data retention - suitable for field-updatable calibration tables. |
| Temperature range | −40°C to +85°C (Industrial grade) - validated for industrial control, metering, and consumer electronics. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - requires no additional level-shifting for 5 V MCU hosts. |
Pinout & Package
93C46BT-E/SN is supplied in 8-lead SOIC (SN) package per Microchip's standard outline, with Pb-free Matte Tin (Sn) finish. Pin 1 is marked by laser dot; pin 1 ID corner is bottom-left when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby but completes ongoing write. |
| 2 CLK | Serial Clock | Synchronizes all data transfers on rising edge; clock may pause mid-instruction without state loss. |
| 3 DI | Data Input | Accepts Start bit, opcode, address, and write data; tied to DO only with series resistor to avoid bus conflict. |
| 4 DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS low or during non-read operations. |
| 5 VSS | Ground | Reference for all I/O and internal logic; must be low-impedance connection to minimize noise coupling. |
| 6 NC | No Connect | Internally unconnected; must be left floating or tied to VSS/VCC - no functional impact. |
| 7 NC | No Connect | Same as Pin 6; confirmed NC for all 93C46A/B variants per Device Selection Table and Pin Function Table. |
| 8 VCC | Power Supply | 4.5–5.5 V only; internal POR circuit blocks writes below 3.8 V; decoupling capacitor required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control - firmware waits only for DO high or uses timeout based on guaranteed 2 ms max TWC. |
| Automatic ERAL before WRAL | Ensures full-array write integrity without explicit erase command - reduces firmware complexity and error risk. |
| Power-on/off data protection | Hardware-enforced write inhibition below 3.8 V prevents corruption during power ramp-up/down or dropout. |
| Ready/Busy status via DO | Enables non-blocking polling - host MCU can perform other tasks while checking DO level for completion. |
| 128 × 8-bit fixed organization | Matches byte-addressable MCU memory maps directly; avoids bit-packing overhead in configuration handling. |
Applications
| Industrial Sensor Calibration | Consumer Appliance Configuration |
|---|---|
|
Use Scenario: Storing factory-trimmed ADC offset/gain coefficients and sensor linearization tables in HVAC controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during boot; single-byte reads dominate; infrequent writes during service calibration. Use Value: 1M endurance ensures >10 years of field recalibration cycles; 5 V compatibility matches legacy 8051/AVR host MCUs. |
Use Scenario: Retaining user preferences (e.g., cooking modes, timer settings) across power cycles in microwave ovens. IC Role / Device Role / Timing Role: Persistent parameter store interfaced to 8-bit MCU via GPIO-banged Microwire; write-protected during normal operation. Use Value: EWEN/EWDS commands prevent accidental overwrites; >200-year retention guarantees data survival beyond product lifetime. |
| Medical Device Setup Data | Automotive Body Control Module |
|
Use Scenario: Saving default alarm thresholds and display brightness levels in portable pulse oximeters. IC Role / Device Role / Timing Role: Low-power configuration memory; reads occur at startup; writes only during clinician setup via USB bridge. Use Value: 5 µA standby current extends battery life; SOIC-8 footprint allows compact PCB layout in space-constrained handheld enclosures. |
Use Scenario: Storing door lock actuator calibration values and mirror position presets in entry-level BCMs. IC Role / Device Role / Timing Role: Dedicated 5 V EEPROM co-located with 5 V MCU; accessed during ignition-on initialization sequence. Use Value: −40°C to +85°C rating meets AEC-Q200 Class 2 requirements; 3 MHz interface speed supports fast boot-time loading. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46BT-I/SN | Wider VCC range (2.5–5.5 V); same 128 × 8-bit organization; identical SOIC-8 package and pinout. | Supports 3.3 V MCU hosts; lacks 4.5–5.5 V-only POR threshold - requires external brown-out detection for robustness. | Select when migrating to mixed-voltage designs or replacing legacy 3.3 V systems; verify power sequencing. |
| AT25010B-SSHL-T | SPI interface (4-wire), 1 Kbit (128 × 8), 1.8–5.5 V; different instruction set and timing; SOIC-8 package. | Requires SPI peripheral instead of GPIO-banged Microwire; supports faster 20 MHz clock; no ERAL/WRAL auto-erase. | Choose for higher throughput or SPI-native platforms; rework firmware for SPI protocol and separate erase commands. |
Compared with 93LC46BT-I/SN, the 93C46BT-E/SN offers tighter voltage control and inherent brown-out immunity but sacrifices 3.3 V compatibility; versus AT25010B-SSHL-T, it provides simpler Microwire timing and integrated auto-erase but lower maximum speed and vendor-specific command structure.
Availability
93C46BT-E/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer appliance configuration, and medical device setup data storage requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 93C46BT-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 microcontroller, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93Cxx series was designed specifically for cost-sensitive, low-pin-count embedded systems needing reliable, low-power serial EEPROM - emphasizing simplicity, voltage robustness, and drop-in replaceability in legacy 5 V designs.
FAQ
What is the function of the NC pins on the 93C46BT-E/SN?
Pin 6 and Pin 7 of the 93C46BT-E/SN are No Connect (NC) terminals - internally unconnected and electrically inactive. They must be left floating or tied to VSS/VCC per PCB layout best practices; neither affects device operation nor timing. This is confirmed in the Pin Function Table and Device Selection Table for all 93C46A variants.
Does the 93C46BT-E/SN support 16-bit word access?
No, the 93C46BT-E/SN does not support 16-bit word access. As a '93C46A' variant, it has fixed 128 × 8-bit organization with no ORG pin. Only '93C46B' (16-bit dedicated) and '93C46C' (pin-selectable) variants offer x16 mode - confirmed in the Device Selection Table and Functional Description section.
What is the maximum clock frequency supported by the 93C46BT-E/SN?
The 93C46BT-E/SN supports up to 3 MHz clock frequency when VCC is 4.5 V to 5.5 V, per AC Characteristics Table A1. At lower voltages (not applicable here), frequency de-rates to 2 MHz or 1 MHz - but since this part is rated only for 4.5–5.5 V, 3 MHz is its absolute maximum operational clock rate.
How does the Ready/Busy status work on the 93C46BT-E/SN?
During erase or write operations, the DO pin of the 93C46BT-E/SN outputs Ready/Busy status: logic low indicates active programming, logic high signals completion. To sample it, CS must be brought high for ≥250 ns after being low (TCSL), then DO is read - confirmed in Sections 2.4–2.9 and Figure 2-1 through 2-11.
Is the 93C46BT-E/SN qualified for automotive applications?
No, the 93C46BT-E/SN is not automotive-qualified. Its 'T' suffix denotes tape-and-reel packaging, not temperature grade; the 'E' in the part number refers to Automotive (−40°C to +125°C) only when explicitly present as a temperature code (e.g., 93C46BE/SN). This part carries 'I'-grade rating (−40°C to +85°C), verified in the Device Selection Table and Package Marking Information.
93C46BT-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:
- 64 x 16
- 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
93C46BT-E/SN FAQ
1.How can I place an order for 93C46BT-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46BT-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 93C46BT-E/SN reliable?
The price and inventory of 93C46BT-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 93C46BT-E/SN is usually 5 days.
3.What payment methods are accepted for 93C46BT-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46BT-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46BT-E/SN?
93C46BT-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46BT-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 93C46BT-E/SN?
For technical support, including 93C46BT-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46BT-E/SN requirements.
6.How does Aetrix verify that 93C46BT-E/SN is sourced from the original manufacturer or authorized distributors?
All 93C46BT-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 93C46BT-E/SN meets industry standards.
7.What is the process for return or replacement of 93C46BT-E/SN?
All 93C46BT-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93C46BT-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 93C46BT-E/SN part is unused and in its original packaging.
Return procedure for 93C46BT-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C46BT-E/SN Tags
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