93C46AT-I/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93C46AT-I/ST is a 1Kbit non-volatile EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and operating at 2 MHz clock frequency. This component is housed in an 8-TSSOP surface mount package and is actively produced with ROHS3 compliance. Substitute parts are identified when equivalent memory capacity, interface compatibility, package form factor, and electrical operating ranges align with application requirements.

Substiute Parts

93C46AT-I/ST

Microchip TechnologyIn Stock: 248993C46AT-I/ST Datasheet

Current PartRFQ

93LC46AT-I/ST

Microchip TechnologyIn Stock: 384193LC46AT-I/ST Datasheet

MFR RecommendedRFQ

AT93C46D-TH-T

Microchip TechnologyIn Stock: 5128AT93C46D-TH-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 93C46AT-I/ST are identified based on the following critical parameters:

Memory Capacity & Organization: All substitutes maintain 1Kbit capacity with 128 x 8 organization to ensure functional equivalence in data storage and retrieval.

Package Compatibility: All substitutes use the 8-TSSOP surface mount package with identical 0.173" width (4.40mm), ensuring PCB layout and assembly compatibility without redesign.

Operating Temperature: All substitutes support the -40°C ~ 85°C temperature range, maintaining thermal performance across industrial and commercial applications.

Clock Frequency: All substitutes operate at 2 MHz, ensuring timing compatibility with existing circuit designs.

Serial Interface Protocol: Substitutes are grouped by interface type—Microwire protocol (93LC46AT-I/ST) maintains direct protocol compatibility, while 3-Wire Serial interface (AT93C46D-TH-T) represents a functional alternative with different pin configuration requirements.

Supply Voltage Range: The 93C46AT-I/ST operates within 4.5V ~ 5.5V. Substitutes with extended voltage ranges (2.5V ~ 5.5V or 1.8V ~ 5.5V) provide broader application flexibility while remaining compatible with the original 4.5V ~ 5.5V operating window.

Parameter Comparison

Engineering Selection Recommendations

93LC46AT-I/ST is the primary substitute when Microwire protocol compatibility is required. This part maintains identical serial interface protocol and memory organization as the 93C46AT-I/ST while offering extended supply voltage range (2.5V ~ 5.5V) for low-power applications. Both parts are actively produced with ROHS3 compliance and identical thermal specifications. The 93LC46AT-I/ST is available in Tape & Reel packaging with higher inventory (3800 Pcs).

AT93C46D-TH-T is selected when 3-Wire Serial interface protocol is acceptable in the circuit design. This part provides the widest supply voltage range (1.8V ~ 5.5V), enabling operation in ultra-low-power and extended voltage environments. The AT93C46D-TH-T supports dual memory organization (128 x 8 and 64 x 16), offering additional flexibility. All three parts maintain identical package form factor, operating temperature range, and clock frequency. Selection between these substitutes depends on interface protocol requirements and supply voltage constraints of the target application.

Frequently Asked Questions (FAQ)

Q: Can 93LC46AT-I/ST directly replace 93C46AT-I/ST without circuit modification?

A: Yes, for applications operating within the 4.5V ~ 5.5V supply range. Both parts use identical Microwire serial protocol, memory capacity (1Kbit, 128 x 8), clock frequency (2 MHz), and 8-TSSOP package. No PCB redesign is required. The extended voltage range of 93LC46AT-I/ST (2.5V ~ 5.5V) provides additional flexibility for low-power designs.

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

A: Microwire (93C46AT-I/ST and 93LC46AT-I/ST) and 3-Wire Serial (AT93C46D-TH-T) are distinct serial communication protocols with different pin configurations and timing requirements. Direct substitution between these interface types requires circuit redesign and firmware modification. Selection depends on the host microcontroller's serial interface capabilities.

Q: Are all three parts pin-compatible?

A: No. While all three parts use the 8-TSSOP package, Microwire and 3-Wire Serial protocols have different pin assignments. The 93C46AT-I/ST and 93LC46AT-I/ST are pin-compatible with each other. The AT93C46D-TH-T requires different circuit connections and cannot be used as a direct pin-for-pin replacement.

Q: What is the impact of write cycle time differences?

A: The 93C46AT-I/ST has a 2ms write cycle time, while 93LC46AT-I/ST requires 6ms and AT93C46D-TH-T requires 5ms. For applications with strict timing requirements, the faster write cycle of the original part may be necessary. In most applications, the longer write cycles of substitute parts do not impact system performance.

Q: Which substitute offers the best supply voltage flexibility?

A: The AT93C46D-TH-T provides the widest supply voltage range (1.8V ~ 5.5V), enabling operation in battery-powered and ultra-low-power applications. The 93LC46AT-I/ST offers intermediate flexibility (2.5V ~ 5.5V). Selection depends on the minimum supply voltage required by the target application.

Q: Are all parts RoHS compliant?

A: Yes. All three parts—93C46AT-I/ST, 93LC46AT-I/ST, and AT93C46D-TH-T—are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for commercial and industrial applications.