ICE40LP640-CM81 Equivalent & Substitute Parts

Part Overview

The ICE40LP640-CM81 is an iCE40™ LP Field Programmable Gate Array (FPGA) from Lattice Semiconductor Corporation, featuring 640 logic elements, 32768 bits of embedded RAM, and 63 I/O pins in an 81-VFBGA package. This device is classified as obsolete, making identification of compatible substitute parts essential for ongoing design support and production continuity. The iCE40 LP series provides low-power programmable logic solutions suitable for embedded applications requiring configurable digital functionality.

Substiute Parts

ICE40LP640-CM81

Lattice Semiconductor CorporationIn Stock: 979ICE40LP640-CM81 Datasheet

Current PartRFQ

ICE40LP1K-CM81

Lattice Semiconductor CorporationIn Stock: 1583ICE40LP1K-CM81 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ICE40LP640-CM81 is determined by the following critical parameters:

Electrical Compatibility:

• Supply voltage range (1.14V ~ 1.26V) must be maintained
• Operating temperature range (-40°C ~ 100°C TJ) must be supported

Physical Compatibility:

• Package type must remain 81-VFBGA to ensure PCB footprint compatibility
• I/O count must be 63 pins to match signal routing requirements
• Mounting type must be Surface Mount

Functional Capacity:

• Logic element count and RAM capacity may increase in substitute parts, as higher capacity devices remain backward compatible with designs utilizing fewer resources
• The iCE40 LP series architecture ensures functional compatibility across capacity variants

The ICE40LP1K-CM81 qualifies as a direct substitute based on matching all critical electrical, physical, and architectural parameters while providing increased logic capacity.

Parameter Comparison

Engineering Selection Recommendations

The ICE40LP1K-CM81 is the qualified substitute for the obsolete ICE40LP640-CM81. Selection of this substitute is supported by the following factors:

Compliance & Availability: The ICE40LP1K-CM81 maintains Active product status with confirmed inventory availability (1559 pcs), ensuring reliable procurement for production and design support. The obsolete status of the ICE40LP640-CM81 necessitates transition to an active alternative.

Electrical & Physical Compatibility: Both devices operate within identical supply voltage ranges (1.14V ~ 1.26V) and temperature specifications (-40°C ~ 100°C TJ). The 81-VFBGA package and 63 I/O configuration remain unchanged, preserving PCB-level compatibility and signal routing.

Functional Capacity: The ICE40LP1K-CM81 provides doubled logic element capacity (1280 vs. 640) and doubled RAM capacity (65536 vs. 32768 bits). Designs utilizing the ICE40LP640-CM81 operate within these expanded resource limits, ensuring functional compatibility without design modification.

Regulatory Alignment: Both devices maintain identical REACH and ECCN classifications, supporting consistent regulatory compliance across supply chain transitions.

Frequently Asked Questions (FAQ)

Q: Can the ICE40LP1K-CM81 directly replace the ICE40LP640-CM81 on existing PCBs?

A: Yes. Both devices share the 81-VFBGA package footprint, identical I/O count (63 pins), and matching supply voltage requirements (1.14V ~ 1.26V). No PCB redesign is required.

Q: Will existing firmware or FPGA designs require modification?

A: No. The ICE40LP1K-CM81 is architecturally compatible with the iCE40 LP series. Designs targeting the ICE40LP640-CM81 will function on the ICE40LP1K-CM81 without modification, as the substitute device provides additional logic and memory resources.

Q: What is the significance of the increased logic element and RAM capacity?

A: The ICE40LP1K-CM81 doubles both logic element count (1280 vs. 640) and RAM capacity (65536 vs. 32768 bits). These increases provide design headroom for future enhancements without requiring component substitution. Existing designs utilizing fewer resources remain fully compatible.

Q: Are there any thermal or power supply differences?

A: No. Both devices operate within identical temperature ranges (-40°C ~ 100°C TJ) and supply voltage specifications (1.14V ~ 1.26V). Thermal and power management strategies remain unchanged.

Q: Why is the ICE40LP640-CM81 classified as obsolete?

A: Lattice Semiconductor has transitioned the ICE40LP640-CM81 to obsolete status. The ICE40LP1K-CM81, with Active product status and higher capacity, represents the current production alternative within the iCE40 LP family.

Q: Are moisture sensitivity levels identical?

A: Yes. Both devices maintain MSL 3 classification (168 Hours), requiring identical handling and storage protocols during manufacturing and assembly.