A-TB508-OQ03CV Terminal Block Header Equivalent & Substitute Parts

Part Overview

The A-TB508-OQ03CV is a 3-position terminal block header manufactured by Assmann WSW Components. This vertical through-hole component features male pins with 4-side shrouding and 0.200" (5.08mm) pitch spacing. The part is Active in product status and widely used in industrial control, power distribution, and signal routing applications where reliable solder-terminated connections are required. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and connector interface specifications to ensure functional compatibility in circuit designs.

Key Parameters

Parameter	A-TB508-OQ03CV
Manufacturer	Assmann WSW Components
Number of Positions	3
Pitch	0.200" (5.08mm)
Header Orientation	Vertical
Type	Header, Male Pins, Shrouded (4 Side)
Termination Style	Solder
Mounting Type	Through Hole
Current - UL	20 A
Voltage - UL	300 V
Operating Temperature	-40°C ~ 115°C
Material Flammability Rating	UL94 V-0
Contact Material	Brass
Housing Material	Thermoplastic
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts are grouped into two categories based on pitch specification, which is the primary mechanical parameter determining physical compatibility:

Category 1: 5.08mm Pitch (0.200") - Direct Mechanical Compatibility These parts maintain identical 5.08mm pitch spacing and vertical orientation, ensuring direct PCB footprint compatibility. Substitutes in this category are Molex 0395311003, 0395315003, 0395316003, Phoenix Contact 1755749, and Phoenix Contact 1924318.

Category 2: 5.00mm Pitch (0.197") - Pitch Variation These parts feature 5.00mm pitch spacing and are mechanically distinct from the main part. Substitutes in this category are Molex 0395211003, 0395215003, 0395216003, and Phoenix Contact 1924208, 5433024. These require PCB layout modification and are suitable only when design flexibility permits pitch adjustment.

Substitution logic is based on the following allowed parameters: number of positions (3), header orientation (vertical), termination style (solder), mounting type (through hole), shrouding configuration, and electrical ratings (voltage and current within or equal to specified limits).

Parameter Comparison

Parameter	A-TB508-OQ03CV	0395311003	0395315003	0395316003	1755749	1924318	0395211003	0395215003	0395216003	1924208	5433024
Manufacturer	Assmann WSW	Molex	Molex	Molex	Phoenix Contact	Phoenix Contact	Molex	Molex	Molex	Phoenix Contact	Phoenix Contact
Pitch	5.08mm	5.08mm	5.08mm	5.08mm	5.08mm	5.08mm	5.00mm	5.00mm	5.00mm	5.00mm	5.00mm
Number of Positions	3	3	3	3	3	3	3	3	3	3	3
Header Orientation	Vertical	Vertical	Vertical	Vertical	Vertical	Vertical	Vertical	Vertical	Vertical	Vertical	Vertical
Shrouding	4 Side	4 Side	2 Side	4 Side	4 Side	4 Side	4 Side	2 Side	4 Side	4 Side	4 Side
Termination Style	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Current - UL (A)	20	15	15	15	12	16	15	15	15	16	15
Voltage - UL (V)	300	300	300	300	300	300	300	300	300	300	300
Operating Temperature	-40°C ~ 115°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-	-	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-	-
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Vendor Undefined	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant
Contact Tail Length	0.157" (4.00mm)	0.130" (3.30mm)	0.150" (3.81mm)	0.130" (3.30mm)	0.154" (3.90mm)	0.154" (3.90mm)	0.130" (3.30mm)	0.150" (3.81mm)	0.130" (3.30mm)	0.154" (3.90mm)	0.154" (3.90mm)
Insulation Height	0.472" (12.00mm)	0.472" (12.00mm)	0.472" (12.00mm)	0.472" (12.00mm)	0.472" (12.00mm)	0.472" (12.00mm)	0.470" (11.94mm)	0.470" (11.94mm)	0.470" (11.94mm)	0.472" (12.00mm)	0.472" (12.00mm)

Engineering Selection Recommendations

5.08mm Pitch Direct Substitutes (Recommended for PCB Compatibility)

Molex 0395311003, 0395315003, and 0395316003 maintain identical 5.08mm pitch and vertical orientation. All three are ROHS3 compliant (0395315003 status undefined) and rated for 15A UL current. These parts are suitable for direct footprint replacement when current requirements do not exceed 15A. The 0395316003 variant with 4-side shrouding and green housing provides closest mechanical alignment to the original part.

Phoenix Contact 1755749 and 1924318 are ROHS3 compliant alternatives with 5.08mm pitch. The 1755749 is rated for 12A UL current, while 1924318 is rated for 16A UL current. Both feature 4-side shrouding and meet UL94 V-0 flammability requirements. The 1924318 offers higher current capacity (16A) compared to the main part's 20A rating, making it suitable for applications with reduced current demands.

5.00mm Pitch Alternatives (Design Modification Required)

Molex 0395211003, 0395215003, and 0395216003 feature 5.00mm pitch and require PCB layout modification. All are ROHS3 compliant and rated for 15A UL current. The 0395216003 with 4-side shrouding provides the closest mechanical configuration to the original part.

Phoenix Contact 1924208 and 5433024 are 5.00mm pitch alternatives. The 1924208 is ROHS3 compliant with 16A UL current rating. The 5433024 is RoHS compliant (not ROHS3) with 15A UL current rating. Both require PCB redesign and are suitable only when pitch adjustment is feasible.

All substitute parts meet UL94 V-0 flammability requirements and 300V UL voltage rating. Current capacity varies from 12A to 16A across substitutes, all below the original part's 20A rating. Operating temperature specifications are not uniformly provided across all substitutes.

Frequently Asked Questions (FAQ)

Q: Can I use a 5.00mm pitch substitute on a PCB designed for 5.08mm pitch? A: No. The 5.00mm pitch parts (Molex 0395211003, 0395215003, 0395216003, Phoenix Contact 1924208, 5433024) have different hole spacing and require PCB layout modification. Direct substitution without PCB redesign will result in misalignment and connection failure.

Q: What is the difference between 2-side and 4-side shrouding? A: Shrouding provides mechanical protection and alignment during mating. 4-side shrouding (Molex 0395311003, 0395316003, Phoenix Contact 1755749, 1924318) offers complete enclosure on all sides. 2-side shrouding (Molex 0395215003, 0395315003) provides protection on two sides only. The original A-TB508-OQ03CV features 4-side shrouding.

Q: Are all substitute parts RoHS compliant? A: Most substitutes are ROHS3 compliant. Molex 0395315003 has undefined RoHS status. Phoenix Contact 5433024 is RoHS compliant but not specifically ROHS3 certified. Verify compliance requirements for your application before selection.

Q: What is the current rating limitation when substituting? A: The original A-TB508-OQ03CV is rated for 20A UL current. All substitute parts are rated at 15A or 16A UL current, which is lower. Substitutes are suitable only for applications requiring 15A or less. For applications requiring 20A capacity, the original part or equivalent 20A-rated alternatives must be used.

Q: Can I substitute based on shrouding type alone? A: No. Shrouding type is one parameter among many. Pitch, number of positions, orientation, termination style, and electrical ratings must all match or be compatible. A 4-side shrouded 5.00mm pitch part cannot replace a 4-side shrouded 5.08mm pitch part despite identical shrouding configuration.

Q: What is contact tail length and why does it vary? A: Contact tail length is the solder tail dimension extending below the housing. The original part has 0.157" (4.00mm) tail length. Substitutes range from 0.130" to 0.154". Variations may affect PCB hole depth requirements and solder joint formation. Verify PCB design accommodates the substitute's tail length specification.

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