MST6440C Equivalent & Substitute Parts

Part Overview

The MST6440C is a 3-character, 0.56" green 7-segment LED display module manufactured by onsemi in a 28-DIP package configuration. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The display operates at 2.1V forward voltage with a 20mA test current and provides 2.2mcd brightness output at a 570nm peak wavelength.

Substiute Parts

MST6440C

onsemiIn Stock: 1107MST6440C Datasheet

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BC56-11CGKWA

KingbrightIn Stock: 1048BC56-11CGKWA Datasheet

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BC56-11GWA

KingbrightIn Stock: 961BC56-11GWA Datasheet

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LDT-C512RI

Lumex Opto/Components Inc.In Stock: 2146LDT-C512RI Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MST6440C is determined by the following critical parameters:

• Display Configuration: 3-character, 0.56" digit size, 7-segment display type
• Electrical Interface: Common cathode configuration
• Package Type: 28-DIP (0.600", 15.24mm) form factor
• Electrical Characteristics: Forward voltage range 2.1V–2.2V, test current 20mA or lower
• Optical Properties: Green color, wavelength 565nm–574nm
• Compliance: Moisture sensitivity level 1, REACH unaffected status

The substitute parts BC56-11CGKWA, BC56-11GWA, and LDT-C512RI meet these core substitution criteria. All candidates maintain the same package footprint, display configuration, common cathode topology, and green color specification. Variations in brightness (millicandela rating), forward voltage (within 0.1V tolerance), and test current represent acceptable operational differences within the 7-segment display category.

Parameter Comparison

Engineering Selection Recommendations

BC56-11CGKWA (Kingbright): This substitute maintains identical electrical specifications (2.1V, 20mA) to the MST6440C and offers active product status with RoHS3 compliance. The higher brightness rating (35mcd versus 2.2mcd) provides enhanced visibility margin. Wavelength deviation (574nm versus 570nm) remains within acceptable green LED spectrum tolerance.

BC56-11GWA (Kingbright): This option features a 0.1V forward voltage increase (2.2V) and identical test current (20mA). RoHS3 compliance and active status support long-term supply continuity. Brightness (8.6mcd) and wavelength (565nm) represent moderate deviations from the original specification.

LDT-C512RI (Lumex Opto/Components Inc.): This substitute operates at reduced test current (10mA versus 20mA), resulting in lower power consumption per segment. Active product status and RoHS3 compliance ensure availability. The 2.2V forward voltage and 565nm wavelength align with green LED standards. Higher maximum power dissipation (105mW) reflects the lower current rating across the full module.

All three substitutes are active products with REACH unaffected status and MSL 1 rating, supporting regulatory compliance and supply chain stability compared to the obsolete MST6440C.

Frequently Asked Questions (FAQ)

Q: Can the BC56-11CGKWA directly replace the MST6440C without circuit modification?

A: Yes. The BC56-11CGKWA maintains the same 28-DIP package footprint, common cathode configuration, and electrical operating point (2.1V, 20mA). No circuit redesign is required for pin-compatible substitution.

Q: What is the impact of the brightness difference between MST6440C (2.2mcd) and BC56-11CGKWA (35mcd)?

A: The BC56-11CGKWA provides significantly higher brightness. If the original design relied on the lower brightness of the MST6440C for optical balance or to meet specific visibility requirements, current-limiting resistor values may require adjustment to maintain consistent display appearance.

Q: Why does the LDT-C512RI operate at 10mA test current instead of 20mA?

A: The LDT-C512RI is specified with a 10mA test current, which is a manufacturer-defined parameter for this device. This lower current rating reduces power consumption per segment. Designs using this substitute should verify that the reduced current still meets minimum brightness and visibility requirements for the application.

Q: Are all three substitutes compatible with the same PCB layout?

A: Yes. All three substitutes use the 28-DIP (0.600", 15.24mm) package, ensuring identical pin spacing and footprint compatibility with the original MST6440C design.

Q: What is the wavelength tolerance across these substitutes?

A: Wavelengths range from 565nm to 574nm across the substitute options. This 9nm variation falls within standard green LED color perception tolerance and should not produce visible color differences in typical applications.

Q: Do all substitutes meet the same regulatory requirements as the MST6440C?

A: All three substitutes carry REACH unaffected status and MSL 1 (unlimited) moisture sensitivity rating, matching the MST6440C compliance profile. BC56-11CGKWA and BC56-11GWA additionally carry RoHS3 compliance certification, providing enhanced regulatory alignment for new designs.