COM-11644 Addressable LED 7 Segment I2C Display - Equivalent & Substitute Parts

Part Overview

The COM-11644 is a 4-digit addressable LED 7-segment display module manufactured by SparkFun Electronics. This component integrates red LEDs with an ATMega328 microcontroller, supporting multiple communication interfaces (I2C, SPI, UART) for flexible integration into embedded systems and display applications. The product is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

COM-11644

SparkFun ElectronicsIn Stock: 1144COM-11644 Datasheet

Current PartRFQ

878

Adafruit Industries LLCIn Stock: 1230878 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the COM-11644 is determined by the following critical parameters:

• Configuration & Display Format: 7-segment, 4-digit display architecture
• LED Color: Red wavelength specification
• Communication Interface: I2C compatibility as primary interface (SPI and UART are secondary)
• Functional Integration: Onboard controller for addressable LED management
• Environmental Compliance: RoHS compliance and MSL rating
• Physical Form Factor: Mounting type and dimensional constraints

The substitute part identified (Adafruit Industries 878) meets the core functional requirements of configuration, digit count, color, and primary I2C interface. However, controller architecture differs (MAX7219 vs. ATMega328), which affects interface capability scope.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: Adafruit Industries 878

The Adafruit 878 is the identified equivalent for COM-11644 replacement. Selection rationale:

• Maintains identical 4-digit, 7-segment red LED display configuration
• Supports I2C interface, the primary communication protocol of the original part
• Utilizes MAX7219 controller, a widely-established LED driver IC with extensive software library support
• Holds active product status with confirmed inventory availability (1129 units)
• Meets current RoHS3 compliance standard, exceeding original RoHS requirement
• Maintains MSL 1 rating for unlimited moisture exposure tolerance

Interface Limitation: The substitute supports I2C only, whereas the original COM-11644 offered I2C, SPI, and UART. Designs dependent on SPI or UART communication require alternative sourcing or interface adaptation.

Controller Difference: The MAX7219 is a dedicated LED display driver, whereas the ATMega328 is a general-purpose microcontroller. This architectural difference may affect custom firmware portability; existing I2C command protocols require validation against MAX7219 specifications.

Frequently Asked Questions (FAQ)

Q: Can the Adafruit 878 directly replace COM-11644 in existing designs?

A: Direct replacement is possible for designs using I2C communication. Designs relying on SPI or UART interfaces require redesign or alternative components. Firmware compatibility must be verified against MAX7219 command set specifications.

Q: What is the primary reason for substitution?

A: COM-11644 is classified as obsolete. The Adafruit 878 provides functional equivalence with active production status and current compliance certifications.

Q: Are there dimensional differences between these parts?

A: COM-11644 dimensions are specified as 40.60mm L × 22.90mm W. Adafruit 878 dimensions are not provided in available documentation. Physical verification is required before mechanical integration.

Q: How do the controller architectures differ?

A: COM-11644 uses ATMega328, a general-purpose microcontroller with integrated I2C, SPI, and UART support. Adafruit 878 uses MAX7219, a dedicated LED display driver with I2C interface only. Software command protocols differ; existing firmware requires adaptation.

Q: Are both parts RoHS compliant?

A: Yes. COM-11644 is RoHS Compliant; Adafruit 878 is ROHS3 Compliant. ROHS3 represents the current regulatory standard and provides equivalent environmental protection.

Q: What is the inventory status of each part?

A: COM-11644: 1068 units available (obsolete status). Adafruit 878: 1129 units available (active production). The substitute has higher inventory availability and ongoing supply assurance.