MAN6740 LED 7-Segment Display - Equivalent & Substitute Parts

Part Overview

The MAN6740 is a dual-character, common cathode red 7-segment LED display manufactured by onsemi, housed in an 18-DIP package with 0.56" digit height. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The MAN6740 operates at a maximum forward voltage of 2V with a test current of 20mA and delivers 0.42mcd brightness at a peak wavelength of 650nm.

Key Parameters

Parameter	MAN6740 Specification
Manufacturer	onsemi
Number of Characters	2
Display Type	7-Segment
Common Pin Configuration	Common Cathode
Color	Red
Digit/Alpha Size	0.56" (14.22mm)
Package / Case	18-DIP (0.600", 15.24mm)
Voltage - Forward (Vf) (Typ)	2V (Max)
Current - Test	20mA
Millicandela Rating	0.42mcd
Wavelength - Peak	650nm
Physical Dimensions	0.750" H x 0.985" W x 0.315" D (19.05mm x 25.02mm x 8.00mm)
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the MAN6740 is determined by strict adherence to the following parameters:

Display Configuration: 2-character, 7-segment, common cathode architecture
Physical Compatibility: 0.56" digit height and 18-DIP package footprint
Electrical Operating Range: Forward voltage between 1.8V and 2.1V; test current between 10mA and 20mA
Color and Wavelength: Red LED with peak wavelength in the 635nm to 697nm range
Package Dimensions: 18-DIP (0.600", 15.24mm) with overall height, width, and depth within ±0.02" tolerance

All substitute parts listed below meet these core criteria, ensuring mechanical and electrical compatibility with circuits designed for the MAN6740.

Parameter Comparison

Part Number	Manufacturer	Vf (Typ)	Current - Test	mcd Rating	Wavelength - Peak	Digit Size	Package	Product Status	RoHS Status
MAN6740	onsemi	2V (Max)	20mA	0.42mcd	650nm	0.56"	18-DIP	Obsolete	Not Specified
HDSP-523A	Broadcom Limited	1.85V	20mA	6.5mcd	660nm	0.56"	18-DIP	Active	ROHS3 Compliant
HDSP-523E	Broadcom Limited	2.05V	20mA	4mcd	640nm	0.56"	18-DIP	Active	ROHS3 Compliant
LBP-602VK2	Rohm Semiconductor	1.9V	10mA	36mcd	650nm	0.56"	18-DIP	Active	ROHS3 Compliant
LDD-C516RI	Lumex Opto/Components Inc.	1.8V	10mA	13.3mcd	660nm	0.56"	18-DIP	Active	ROHS3 Compliant
LDD-HTC514RI	Lumex Opto/Components Inc.	2V	10mA	3.9mcd	635nm	0.56"	18-DIP	Active	ROHS3 Compliant
LTD-6740P	Lite-On Inc.	2.1V	20mA	0.95mcd	697nm	0.56"	18-DIP	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: HDSP-523E (Broadcom Limited) offers the closest electrical and optical match to the MAN6740. It operates at 2.05V forward voltage with 20mA test current, maintaining compatibility with existing circuit designs. The part is active in production, ROHS3 compliant, and available in tube packaging with 1310 units in stock.

Alternative for Lower Power Applications: LDD-C516RI (Lumex Opto/Components Inc.) operates at reduced current (10mA) and lower forward voltage (1.8V), suitable for designs requiring lower power dissipation. This part is ROHS3 compliant and active in production with 2686 units in stock.

Alternative for Matched Brightness: LBP-602VK2 (Rohm Semiconductor) delivers significantly higher brightness (36mcd) at 1.9V forward voltage with 10mA test current. This part is ROHS3 compliant and active in production with 1424 units in stock, making it suitable for applications requiring enhanced visibility.

All substitute parts are ROHS3 compliant and carry unlimited moisture sensitivity level (MSL 1), ensuring compatibility with standard manufacturing and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can I directly replace MAN6740 with any of these substitute parts?

A: Yes, all listed substitute parts share the same 18-DIP package footprint, 0.56" digit height, 2-character common cathode configuration, and red LED color. They are mechanically and electrically compatible with circuits designed for the MAN6740.

Q: What is the main difference between HDSP-523A and HDSP-523E?

A: Both are Broadcom HDSP-523 series parts with identical electrical specifications (1.85V and 2.05V forward voltage respectively, 20mA test current). The primary difference is packaging: HDSP-523A is supplied in bulk, while HDSP-523E is supplied in tube format.

Q: Why do some substitutes operate at 10mA instead of 20mA?

A: LBP-602VK2, LDD-C516RI, and LDD-HTC514RI are designed for lower current operation (10mA test current). These parts are fully compatible with the MAN6740 footprint and package but require circuit design consideration for current-limiting resistor values. Lower current operation reduces power dissipation and extends LED lifespan.

Q: Which substitute offers the brightest display?

A: LBP-602VK2 delivers 36mcd brightness, significantly higher than the MAN6740's 0.42mcd rating. This part is suitable for applications requiring enhanced visibility in high ambient light conditions.

Q: Are all substitutes RoHS compliant?

A: Yes, all substitute parts listed are ROHS3 compliant. The MAN6740 RoHS status is not specified in available documentation.

Q: What is the wavelength difference between substitutes?

A: Substitute parts span a wavelength range from 635nm to 697nm, compared to the MAN6740's 650nm. This variation represents different red LED formulations and may result in slight color perception differences. For applications requiring precise color matching, HDSP-523A (660nm) and LBP-602VK2 (650nm) provide the closest wavelength alignment.

Q: Can I use these substitutes in existing PCB designs without modification?

A: Yes. All substitute parts use the identical 18-DIP (0.600", 15.24mm) package with the same pin configuration and spacing. PCB footprints designed for MAN6740 will accommodate all listed substitutes without modification. However, circuit designers should verify forward voltage and current specifications to ensure proper operation with existing current-limiting resistor values.

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