93C56CT-I/MC EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93C56CT-I/MC is a 2Kbit non-volatile EEPROM memory IC manufactured by Microchip Technology, designed for Microwire serial interface applications. This component operates at 3 MHz clock frequency with a 4.5V to 5.5V supply voltage range and is housed in an 8-DFN (2x3) surface mount package. The device is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent memory capacity, interface protocol, package form factor, and operating temperature range align with the main part specifications, enabling direct functional replacement in circuit designs.

Substiute Parts

93C56CT-I/MC

Microchip TechnologyIn Stock: 112893C56CT-I/MC Datasheet

Current PartRFQ

93LC56CT-I/MC

Microchip TechnologyIn Stock: 162593LC56CT-I/MC Datasheet

MFR RecommendedRFQ

AT93C56B-MAHM-T

Microchip TechnologyIn Stock: 38723AT93C56B-MAHM-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 93C56CT-I/MC are qualified based on the following criteria:

Primary Compatibility Parameters:

• Memory capacity: 2Kbit
• Memory organization: 256 x 8 or 128 x 16
• Operating temperature range: -40°C to 85°C
• Surface mount package in 8-pin DFN form factor
• Non-volatile EEPROM technology
• Active product status
• ROHS3 compliance

Interface Compatibility: The 93C56CT-I/MC uses Microwire serial interface protocol. Substitute parts must support Microwire or equivalent 3-wire serial interface to maintain functional compatibility with existing circuit designs.

Voltage Supply Compatibility: The main part operates within 4.5V to 5.5V. Substitute parts with extended voltage ranges (such as 2.5V to 5.5V or 1.7V to 5.5V) are compatible, as they encompass the primary part's operating voltage window.

Parameter Comparison

Engineering Selection Recommendations

93LC56CT-I/MC (Microchip Technology)

This part is the primary recommended substitute for the 93C56CT-I/MC. Both devices share identical memory capacity, organization, interface protocol, package form factor, and operating temperature specifications. The 93LC56CT-I/MC features an extended voltage supply range (2.5V to 5.5V) compared to the main part, providing greater design flexibility for low-power applications while maintaining full compatibility within the 4.5V to 5.5V operating window. Write cycle time extends to 6ms versus 2ms on the main part. Both parts are active production items with ROHS3 compliance and MSL 1 rating. The 93LC56CT-I/MC is verified as programmable through DiGi-Electronics.

AT93C56B-MAHM-T (Microchip Technology)

This part provides functional substitution with equivalent 2Kbit memory capacity and organization. The AT93C56B-MAHM-T uses 3-Wire Serial interface protocol rather than Microwire, requiring circuit-level interface verification before deployment. Clock frequency is 2 MHz compared to 3 MHz on the main part. The package is 8-UFDFN (Mini Map) versus 8-VFDFN on the main part; both are 8-pin DFN form factors with 2x3mm dimensions suitable for surface mount assembly. Voltage supply range extends to 1.7V minimum, providing broader low-voltage compatibility. Moisture sensitivity level is MSL 3 (168 hours) versus MSL 1 on the main part, requiring controlled storage and handling conditions. All parts maintain ROHS3 compliance and -40°C to 85°C operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the 93LC56CT-I/MC directly replace the 93C56CT-I/MC without circuit modifications?

A: Yes. Both parts share identical Microwire interface protocol, memory capacity (2Kbit), organization (256 x 8, 128 x 16), package form factor (8-DFN 2x3), and operating temperature range (-40°C to 85°C). The 93LC56CT-I/MC operates within the 4.5V to 5.5V supply window of the main part and is pin-compatible. Write cycle time difference (6ms versus 2ms) does not affect functional compatibility in most applications.

Q: Is the AT93C56B-MAHM-T compatible with the 93C56CT-I/MC?

A: The AT93C56B-MAHM-T provides functional memory substitution with equivalent 2Kbit capacity and organization. However, the interface protocol differs: AT93C56B-MAHM-T uses 3-Wire Serial versus Microwire on the main part. Circuit-level interface verification is required to confirm compatibility with existing firmware and hardware implementations. Package dimensions are equivalent (8-pin DFN 2x3), enabling physical substitution.

Q: What are the key differences in voltage supply specifications?

A: The 93C56CT-I/MC operates at 4.5V to 5.5V. The 93LC56CT-I/MC extends the lower limit to 2.5V, and the AT93C56B-MAHM-T extends to 1.7V minimum. All three parts function within the 4.5V to 5.5V window. Extended voltage ranges on substitute parts enable operation in low-power or battery-powered designs without affecting compatibility in standard 5V systems.

Q: How do write cycle times affect part selection?

A: The 93C56CT-I/MC specifies 2ms write cycle time. The 93LC56CT-I/MC specifies 6ms, and the AT93C56B-MAHM-T specifies 5ms. Longer write cycle times do not prevent functional substitution but may impact applications requiring rapid sequential write operations. Verify write timing requirements in the circuit design before selecting a substitute part.

Q: What is the significance of Moisture Sensitivity Level (MSL) ratings?

A: The 93C56CT-I/MC and 93LC56CT-I/MC carry MSL 1 (unlimited shelf life). The AT93C56B-MAHM-T carries MSL 3 (168-hour floor life after moisture exposure). MSL 3 components require controlled storage conditions and have limited time windows for assembly after moisture exposure. Select MSL 1 parts for applications with extended storage or less stringent manufacturing controls.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The 93C56CT-I/MC, 93LC56CT-I/MC, and AT93C56B-MAHM-T are all ROHS3 compliant and suitable for applications requiring lead-free component specifications.