AT93C46A-10PI Equivalent & Substitute Parts

Part Overview

The AT93C46A-10PI is a 1Kbit EEPROM memory IC with 3-Wire Serial interface operating at 2 MHz, manufactured by Microchip Technology in an 8-DIP through-hole package. This device is classified as obsolete, indicating it has been discontinued and is no longer in active production. Finding equivalent or substitute parts is necessary to support legacy system maintenance, design updates, or when original inventory becomes unavailable.

Substiute Parts

AT93C46A-10PI

Microchip TechnologyIn Stock: 924AT93C46A-10PI Datasheet

Current PartRFQ

93C46B/P

Microchip TechnologyIn Stock: 391393C46B/P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT93C46A-10PI is determined by the following critical parameters:

• Memory capacity (1Kbit) and organization (64 x 16 or 128 x 8)
• Serial interface protocol compatibility (3-Wire Serial or Microwire)
• Clock frequency (2 MHz minimum)
• Supply voltage range (4.5V ~ 5.5V)
• Package form factor (8-DIP through-hole)
• Pin-to-pin compatibility

The 93C46B/P qualifies as a substitute because it maintains identical memory capacity, clock frequency, supply voltage, and package configuration. The interface protocol differs (Microwire vs. 3-Wire Serial), but both are serial protocols supported by the same pin configuration in the 8-DIP package, allowing functional substitution in compatible system designs.

Parameter Comparison

Engineering Selection Recommendations

The 93C46B/P is the manufacturer-recommended substitute for the obsolete AT93C46A-10PI. Selection should be based on the following factors:

• Product Status: The 93C46B/P is active and in production, ensuring long-term availability and supply chain stability, whereas the AT93C46A-10PI is obsolete.
• Compliance: The 93C46B/P is RoHS3 compliant, meeting current environmental and regulatory standards. The AT93C46A-10PI is RoHS non-compliant.
• Inventory: The 93C46B/P has significantly higher inventory availability (3812 Pcs) compared to the AT93C46A-10PI (835 Pcs).
• Operating Temperature Range: The AT93C46A-10PI supports -40°C ~ 85°C, while the 93C46B/P supports 0°C ~ 70°C. Applications requiring extended low-temperature operation below 0°C must verify compatibility.
• Write Performance: The 93C46B/P offers improved write cycle time (2ms vs. 10ms), providing faster programming capability.

Frequently Asked Questions (FAQ)

Q: Can the 93C46B/P directly replace the AT93C46A-10PI in existing designs?

A: Pin-to-pin compatibility exists for the 8-DIP package. However, the interface protocol differs (Microwire vs. 3-Wire Serial). Direct replacement requires verification that the system firmware or hardware supports Microwire protocol communication.

Q: What is the difference between 3-Wire Serial and Microwire interfaces?

A: Both are serial communication protocols using the same pin configuration in the 8-DIP package. The specific protocol implementation depends on the host controller's firmware or hardware interface. Compatibility must be confirmed with the system design documentation.

Q: Does the operating temperature range difference affect substitution?

A: The 93C46B/P operates from 0°C ~ 70°C, while the AT93C46A-10PI operates from -40°C ~ 85°C. Applications requiring operation below 0°C or above 70°C cannot use the 93C46B/P as a substitute.

Q: Is the 93C46B/P RoHS compliant?

A: Yes, the 93C46B/P is RoHS3 compliant. The AT93C46A-10PI is RoHS non-compliant. New designs should prioritize RoHS-compliant components.

Q: What is the significance of the improved write cycle time in the 93C46B/P?

A: The 93C46B/P has a write cycle time of 2ms compared to 10ms for the AT93C46A-10PI. This means data can be written to the 93C46B/P five times faster, reducing overall programming time in applications that perform frequent write operations.

Q: Are both parts available in the same packaging options?

A: Both parts are supplied in 8-DIP through-hole packages. The 93C46B/P is supplied in tube packaging, while the AT93C46A-10PI packaging format is not specified in the provided data.