LC4256V-5FT256AI Equivalent & Substitute Parts

Part Overview

The LC4256V-5FT256AI is a Complex Programmable Logic Device (CPLD) from Lattice Semiconductor Corporation's ispMACH® 4000V series. This embedded integrated circuit features 256 macrocells with a maximum propagation delay of 5 nanoseconds, housed in a 256-pin fine-pitch ball grid array package. The device is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements.

Substiute Parts

LC4256V-5FT256AI

Lattice Semiconductor CorporationIn Stock: 3141LC4256V-5FT256AI Datasheet

Current PartRFQ

LC4256V-5FTN256AC

Lattice Semiconductor CorporationIn Stock: 1482LC4256V-5FTN256AC Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The LC4256V-5FTN256AC qualifies as a direct substitute based on the following critical parameters:

• Identical macrocell count (256)
• Identical logic element configuration (16 blocks)
• Identical I/O count (128)
• Identical maximum propagation delay (5 ns)
• Identical internal voltage supply range (3V ~ 3.6V)
• Identical package type (256-FTBGA, 17x17)
• Identical mounting type (Surface Mount)
• Identical programmable type (In System Programmable)
• Same manufacturer (Lattice Semiconductor Corporation)
• Same series (ispMACH® 4000V)

The substitute part differs in product status (Active vs. Obsolete), operating temperature range, packaging format, and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The LC4256V-5FTN256AC is the active equivalent for the obsolete LC4256V-5FT256AI. Selection of the substitute part is appropriate when:

• Operating temperature requirements fall within 0°C to 90°C (TJ)
• RoHS3 compliance is required for new designs or production
• Active product support and availability are necessary
• Tray packaging format is acceptable for assembly operations

The original LC4256V-5FT256AI remains suitable only for legacy systems where the extended temperature range (-40°C to 105°C) is mandatory and RoHS compliance is not required.

Frequently Asked Questions (FAQ)

Q: Are the LC4256V-5FT256AI and LC4256V-5FTN256AC pin-compatible?

A: Yes. Both devices use the 256-FTBGA (17x17) package with identical pinout, macrocell configuration, I/O count, and electrical specifications. They are mechanically and electrically interchangeable at the package level.

Q: What is the primary difference between these parts?

A: The LC4256V-5FTN256AC is the active production equivalent with ROHS3 compliance and a narrower operating temperature range (0°C ~ 90°C vs. -40°C ~ 105°C). The original part is obsolete.

Q: Can I use the LC4256V-5FTN256AC in applications requiring -40°C operation?

A: No. The substitute part is rated for 0°C minimum operating temperature. Applications requiring -40°C operation must use the original LC4256V-5FT256AI or identify alternative CPLD solutions with extended temperature ratings.

Q: Does the packaging format change affect assembly?

A: The original part ships in tube packaging; the substitute ships in tray packaging. Both formats are standard for surface-mount assembly operations. Verify compatibility with your assembly equipment and processes.

Q: Are the propagation delay specifications identical?

A: Yes. Both parts specify a maximum propagation delay of 5 nanoseconds, ensuring equivalent timing performance in digital logic applications.

Q: What does "In System Programmable" mean for these devices?

A: Both devices support in-system programming, allowing configuration updates without removal from the circuit board. Programming methodology and tools remain consistent between the two parts.