93LC46AT-I/MS EEPROM Equivalent & Substitute Parts

Part Overview

The 93LC46AT-I/MS is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and operating across a 2.5V to 5.5V supply voltage range. This non-volatile memory device is designed for applications requiring persistent data storage with low power consumption and compact form factor. The part is currently in active production status with 2800 units available in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility allow direct replacement in circuit designs, particularly when addressing packaging availability, supply chain constraints, or specific compliance requirements.

Substiute Parts

93LC46AT-I/MS

Microchip TechnologyIn Stock: 281993LC46AT-I/MS Datasheet

Current PartRFQ

93LC46A-I/MS

Microchip TechnologyIn Stock: 298693LC46A-I/MS Datasheet

DirectRFQ

AT93C46DY6-YH-T

Microchip TechnologyIn Stock: 2392AT93C46DY6-YH-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 93LC46AT-I/MS are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Core Electrical Equivalence Criteria:

• Memory capacity: 1Kbit minimum
• Memory organization: 128 x 8 or compatible
• Serial interface protocol: Microwire or 3-Wire Serial (functionally compatible)
• Clock frequency: 2 MHz minimum
• Supply voltage range: Must encompass or exceed 2.5V ~ 5.5V
• Write cycle time: 6ms or faster
• Operating temperature range: -40°C ~ 85°C minimum

Mechanical Compatibility Criteria:

• Surface mount package: 8-pin configuration
• Package footprint: 8-MSOP or equivalent 8-pin small outline
• Pin count and pinout compatibility

Compliance Criteria:

• RoHS3 compliance required
• REACH unaffected status

The 93LC46A-I/MS qualifies as a direct substitute with identical electrical specifications and package compatibility, differing only in packaging format (Tube vs. Tape & Reel) and MSL rating. The AT93C46DY6-YH-T qualifies as a manufacturer-recommended substitute with enhanced voltage range (1.8V ~ 5.5V), faster write cycle time (5ms), and alternative 3-Wire Serial interface protocol, packaged in 8-Mini Map form factor with verified programmability certification.

Parameter Comparison

Engineering Selection Recommendations

93LC46A-I/MS Selection Criteria: This part is functionally identical to the 93LC46AT-I/MS with matching electrical specifications and 8-MSOP package compatibility. Selection is appropriate when Tube packaging format is preferred over Tape & Reel, or when MSL rating of 2 (1 Year) is acceptable for the application. Both parts maintain active production status and ROHS3 compliance. Inventory availability is comparable at 2900 units.

AT93C46DY6-YH-T Selection Criteria: This manufacturer-recommended substitute offers extended voltage range capability (1.8V ~ 5.5V) and improved write cycle performance (5ms vs. 6ms). The 3-Wire Serial interface protocol provides functional compatibility with Microwire applications through protocol translation at the system level. The 8-Mini Map package form factor requires PCB layout adjustment from the standard 8-MSOP footprint. Selection is appropriate for applications requiring lower minimum supply voltage operation, faster write performance, or when Cut Tape & Digi-Reel packaging format is preferred. DiGi-Electronics programmability verification is confirmed for this part. MSL rating of 3 (168 Hours) applies stricter moisture handling requirements during storage and assembly.

Frequently Asked Questions (FAQ)

Q: Can the 93LC46A-I/MS be used as a direct replacement for the 93LC46AT-I/MS?

A: Yes. Both parts share identical electrical specifications including 1Kbit capacity, Microwire interface, 2 MHz clock frequency, 6ms write cycle time, and 2.5V ~ 5.5V supply range. The 8-MSOP package footprint is identical. The primary difference is packaging format (Tube vs. Tape & Reel) and MSL rating. No circuit modifications are required.

Q: What is the key difference between the Microwire interface on the 93LC46AT-I/MS and the 3-Wire Serial interface on the AT93C46DY6-YH-T?

A: Both are serial communication protocols for EEPROM access. Microwire is a three-wire protocol (Chip Select, Clock, Data In/Out), while 3-Wire Serial is also a three-wire protocol with similar functionality. Protocol compatibility depends on the host controller implementation. System-level interface verification is required before substitution.

Q: Does the AT93C46DY6-YH-T package change affect PCB design?

A: Yes. The AT93C46DY6-YH-T uses an 8-Mini Map (2x3) package form factor, which differs from the 8-MSOP footprint of the 93LC46AT-I/MS. PCB layout and footprint modifications are necessary. Pin assignment compatibility must be confirmed with the device datasheets.

Q: What are the MSL rating implications for each part?

A: MSL (Moisture Sensitivity Level) ratings indicate moisture handling requirements during storage and assembly. The 93LC46AT-I/MS has MSL 1 (Unlimited shelf life), the 93LC46A-I/MS has MSL 2 (1 Year shelf life), and the AT93C46DY6-YH-T has MSL 3 (168 Hours shelf life). Lower MSL ratings require stricter moisture control during manufacturing and storage.

Q: Is the extended voltage range of the AT93C46DY6-YH-T (1.8V ~ 5.5V) a functional advantage?

A: The extended lower voltage limit (1.8V vs. 2.5V) allows operation in lower-power applications. This is an advantage only if the system design requires operation below 2.5V. For applications operating within the 2.5V ~ 5.5V range, both parts are functionally equivalent in this parameter.

Q: Are all three parts RoHS3 compliant?

A: Yes. All three parts (93LC46AT-I/MS, 93LC46A-I/MS, and AT93C46DY6-YH-T) are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.