MST6141C Equivalent & Substitute Parts

Part Overview

The MST6141C is a 3-character red 7-segment LED display module manufactured by onsemi, packaged in 12-DIP 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 20mA test current and features common cathode configuration suitable for multiplexed display applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	MST6141C
Manufacturer	onsemi
Number of Characters	3
Digit/Alpha Size	0.56" (14.22mm)
Display Type	7-Segment
Common Pin Configuration	Common Cathode
Color	Red
Voltage - Forward (Vf) Typical	2.1V
Current - Test	20mA
Package / Case	12-DIP
Physical Dimensions	0.752" H x 1.484" W x 0.315" D (19.10mm x 37.70mm x 8.00mm)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the MST6141C is determined by the following critical parameters:

Display Configuration: 3-character, 7-segment, common cathode architecture
Character Size: 0.56" (14.22mm) digit height
Color: Red LED emission
Electrical Compatibility: Forward voltage within acceptable operating range (2.0V to 2.1V), test current at or below 20mA
Package Type: 12-DIP or compatible pinout configuration
Physical Envelope: Dimensions compatible with 0.752" H x 1.484" W footprint tolerance

Substitute parts must maintain functional equivalence across display type, character count, common cathode configuration, and color specification. Variations in forward voltage, test current, and brightness (millicandela rating) are permissible within the specified electrical operating window. Package variations (12-DIP vs. 28-DIP) introduce pinout differences and require circuit redesign.

Parameter Comparison

Parameter	MST6141C (Main)	LTC-571P	LTC-571HR	LDT-C514RI
Manufacturer	onsemi	Lite-On Inc.	Lite-On Inc.	Lumex Opto/Components Inc.
Number of Characters	3	3	3	3
Digit/Alpha Size	0.56" (14.22mm)	0.56" (14.22mm)	0.56" (14.22mm)	0.56" (14.22mm)
Display Type	7-Segment	7-Segment	7-Segment	7-Segment
Common Pin	Common Cathode	Common Cathode	Common Cathode	Common Cathode
Color	Red	Red	Red	Red
Voltage - Forward (Vf) Typical	2.1V	2.1V	2.0V	2.0V
Current - Test	20mA	20mA	20mA	10mA
Millicandela Rating	0.7mcd	0.95mcd	2.4mcd	5.6mcd
Wavelength - Peak	697nm	697nm	635nm	635nm
Power Dissipation (Max)	40mW	40mW	75mW	105mW
Package / Case	12-DIP	12-DIP (0.600", 15.24mm)	12-DIP (0.600", 15.24mm)	28-DIP (0.600", 15.24mm)
Product Status	Obsolete	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

LTC-571P (Lite-On Inc.) provides the closest electrical and mechanical match to the MST6141C. Both parts operate at 2.1V forward voltage with 20mA test current, identical 12-DIP package configuration, and matching physical dimensions. LTC-571P is active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. Wavelength specification (697nm) matches the original part, maintaining color consistency in display applications.

LTC-571HR (Lite-On Inc.) offers an alternative 12-DIP solution with reduced forward voltage (2.0V) and identical 20mA test current. This part is active with ROHS3 compliance. The wavelength shift to 635nm represents a perceptible color change from deep red to standard red, requiring visual assessment for application suitability. Increased brightness (2.4mcd vs. 0.7mcd) may necessitate current limiting adjustments.

LDT-C514RI (Lumex Opto/Components Inc.) maintains functional display equivalence but introduces package incompatibility (28-DIP vs. 12-DIP), requiring circuit board redesign and pinout verification. This part operates at reduced test current (10mA) and lower forward voltage (2.0V), with significantly higher brightness (5.6mcd). 28-DIP configuration is not a direct socket replacement and should be considered only when PCB layout modifications are feasible.

Frequently Asked Questions (FAQ)

Q: Can LTC-571P be used as a direct replacement for MST6141C without circuit modifications?

A: Yes. LTC-571P matches the MST6141C in forward voltage (2.1V), test current (20mA), 12-DIP package configuration, and physical dimensions. Direct socket substitution is possible without circuit redesign.

Q: What is the difference between LTC-571P and LTC-571HR?

A: Both are 12-DIP common cathode 3-character 7-segment displays from Lite-On. LTC-571P operates at 2.1V forward voltage with 697nm wavelength (deep red), matching the original MST6141C. LTC-571HR operates at 2.0V with 635nm wavelength (standard red) and higher brightness (2.4mcd). The wavelength difference produces a visible color shift.

Q: Why is LDT-C514RI listed as a substitute if it uses 28-DIP packaging?

A: LDT-C514RI maintains functional equivalence in display type, character count, size, and common cathode configuration. However, the 28-DIP package is not pin-compatible with 12-DIP designs. This part is suitable only for new designs or applications where PCB layout can accommodate the different pinout.

Q: Are all substitute parts RoHS compliant?

A: LTC-571P, LTC-571HR, and LDT-C514RI are all ROHS3 compliant. The original MST6141C RoHS status is not specified in available documentation.

Q: What brightness differences should I expect when switching from MST6141C to substitute parts?

A: MST6141C operates at 0.7mcd. LTC-571P provides 0.95mcd (similar brightness). LTC-571HR provides 2.4mcd (approximately 3.4x brighter). LDT-C514RI provides 5.6mcd (approximately 8x brighter). Higher brightness may require current limiting circuit adjustments to maintain consistent display intensity.

Q: Can I use LDT-C514RI in a 12-DIP socket?

A: No. LDT-C514RI uses 28-DIP packaging with different pin spacing (0.600" vs. standard 0.300" DIP spacing) and pinout configuration. Physical insertion into a 12-DIP socket is not possible.

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