Equivalent & Substitute Parts for AA4040SRC

Part Overview

The AA4040SRC is a red LED indication component manufactured by Kingbright, configured as a 2-SMD surface mount right-angle package. This part operates at a forward voltage of 1.85V with a dominant wavelength of 640nm and produces 120mcd luminous intensity. The AA4040SRC is classified as obsolete, necessitating identification of active substitute components that maintain functional compatibility within the same mechanical and electrical parameter envelope.

Substiute Parts

AA4040SRC

KingbrightIn Stock: 5645AA4040SRC Datasheet

Current PartRFQ

AA4040SURCK

KingbrightIn Stock: 1297AA4040SURCK Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AA4040SRC with the AA4040SURCK is permissible based on the following alignment of critical parameters:

Mechanical Compatibility:

• Both components share identical mounting type (Surface Mount, Right Angle)
• Package configuration matches (2-SMD, Boomerang)
• Physical dimensions are identical (4.00mm L x 3.60mm W, 4.00mm max height)
• Lens size is identical (2.40mm Dia)
• Lens transparency is identical (Clear)

Electrical Compatibility:

• Both operate at test current of 20mA
• Forward voltage differential is 0.10V (1.85V vs 1.95V), within typical circuit tolerance
• Viewing angle is identical (90°)
• Both are red LEDs with wavelengths in the red spectrum (640nm vs 630nm dominant)

Regulatory Compliance:

• Both are ROHS3 Compliant
• Both have identical MSL rating (4, 72 Hours)
• Both are REACH Unaffected

Product Status Consideration:

• AA4040SRC is obsolete; AA4040SURCK is active production

Parameter Comparison

Engineering Selection Recommendations

The AA4040SURCK serves as a direct substitute for the obsolete AA4040SRC based on the following engineering criteria:

Mechanical Fit: All physical dimensions, mounting configuration, and package specifications are identical. The AA4040SURCK will occupy the same PCB footprint and assembly space as the AA4040SRC.

Electrical Operation: The forward voltage difference of 0.10V (1.85V to 1.95V) is within standard circuit design tolerance. Both components operate at the same test current of 20mA. Circuit designs using current-limiting resistors will accommodate this minor voltage differential without modification.

Optical Performance: Both components feature identical viewing angles (90°), lens sizes (2.40mm), and lens transparency (Clear). The AA4040SURCK produces higher luminous intensity (250mcd vs 120mcd), which represents an improvement in light output while maintaining the same color spectrum (red).

Regulatory Compliance: Both components maintain identical RoHS3 compliance, MSL ratings, and REACH status, satisfying all regulatory requirements for equivalent substitution.

Product Availability: The AA4040SURCK is in active production status, ensuring long-term availability and supply chain continuity compared to the obsolete AA4040SRC.

Frequently Asked Questions (FAQ)

Q: Can the AA4040SURCK be used as a direct replacement for the AA4040SRC on existing PCBs?

A: Yes. The AA4040SURCK is mechanically and electrically compatible with the AA4040SRC. Both components share identical mounting type, package configuration, physical dimensions, and electrical operating parameters within acceptable tolerance ranges.

Q: What is the significance of the 0.10V forward voltage difference between these components?

A: The forward voltage difference (1.85V vs 1.95V) is negligible in typical LED circuit applications. Standard current-limiting resistor designs accommodate this variation without circuit modification or performance degradation.

Q: Why does the AA4040SURCK have higher luminous intensity (250mcd vs 120mcd)?

A: The higher luminous intensity of the AA4040SURCK represents an improvement in light output performance. This difference results from manufacturing enhancements in the active production version and does not affect mechanical or electrical compatibility.

Q: Are there packaging differences between these components?

A: Yes. The AA4040SRC is supplied in bulk packaging, while the AA4040SURCK is supplied in Tape & Reel (TR) format. This difference affects procurement and assembly processes but does not impact component functionality or performance.

Q: Do both components meet the same regulatory standards?

A: Yes. Both the AA4040SRC and AA4040SURCK are ROHS3 Compliant, REACH Unaffected, and share identical Moisture Sensitivity Level ratings (MSL 4, 72 Hours).

Q: What wavelength differences exist between these red LEDs?

A: The AA4040SRC has a dominant wavelength of 640nm, while the AA4040SURCK has a dominant wavelength of 630nm. Both wavelengths fall within the red spectrum and are visually indistinguishable in typical indication applications.

Q: Is the AA4040SURCK suitable for new designs?

A: Yes. The AA4040SURCK is in active production status and is the recommended component for new designs requiring a Kingbright red LED in 2-SMD right-angle surface mount configuration.