A-TB508-OQ24CV Terminal Block Header Equivalent & Substitute Parts

Part Overview

The A-TB508-OQ24CV is a 24-position terminal block header manufactured by Assmann WSW Components. This component is a male pin, shrouded (4-side) header with 0.200" (5.08mm) pitch spacing, designed for vertical through-hole mounting with solder termination. The part is currently in active production status with 693 units in stock. Terminal block headers of this specification are essential in applications requiring reliable electrical connections with mechanical strain relief and organized wire management in industrial control systems, power distribution, and signal routing applications.

Substiute Parts

A-TB508-OQ24CV

Assmann WSW ComponentsIn Stock: 750A-TB508-OQ24CV Datasheet

Current PartRFQ

1755956

Phoenix ContactIn Stock: 7341755956 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the A-TB508-OQ24CV is determined by the following critical parameters:

• Position Count & Pitch: 24 positions at 0.200" (5.08mm) spacing (non-negotiable for PCB layout compatibility)
• Header Type & Orientation: Male pins, shrouded (4-side), vertical orientation (mechanical and electrical interface requirement)
• Termination & Mounting: Solder termination with through-hole mounting (assembly process compatibility)
• Electrical Ratings: Minimum voltage rating of 300 V UL and current rating of at least 12 A (functional safety requirement)
• Flammability & Compliance: UL94 V-0 material rating and ROHS3 compliance (regulatory requirement)

The substitute part 1755956 (Phoenix Contact COMBICON MSTBVA series) meets all critical substitution criteria. While minor variations exist in contact tail length (0.154" vs. 0.157") and housing material composition (Polyamide/Nylon vs. Thermoplastic), these differences remain within acceptable mechanical tolerances for standard PCB through-hole applications and do not affect functional compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both the A-TB508-OQ24CV and 1755956 are active production components with full ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for industrial and commercial applications. The A-TB508-OQ24CV provides a higher UL current rating of 20 A compared to the substitute's 12 A rating. Selection between these parts should be based on application current requirements: the Assmann part is suitable for higher-current applications, while the Phoenix Contact substitute is appropriate for applications operating at or below 12 A UL current. Both components maintain identical voltage ratings (300 V UL), flammability classification (UL94 V-0), and mechanical compatibility through identical pitch, position count, and insulation height specifications. The minor difference in contact tail length (0.003" / 0.10mm) is within standard PCB through-hole tolerance ranges and does not affect functional performance in standard applications.

Frequently Asked Questions (FAQ)

Q: Can the Phoenix Contact 1755956 be used as a direct replacement for the A-TB508-OQ24CV?

A: Yes, for applications requiring 12 A or less at 300 V UL. Both parts share identical position count (24), pitch (5.08mm), orientation (vertical), termination method (solder), and mounting type (through-hole). The primary difference is the current rating: the Assmann part is rated for 20 A while the Phoenix Contact part is rated for 12 A.

Q: What are the critical parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: 24-position count, 0.200" (5.08mm) pitch, vertical orientation, male pins with 4-side shrouding, solder termination, through-hole mounting, 300 V UL voltage rating, and UL94 V-0 flammability classification. Deviations in any of these parameters indicate incompatibility.

Q: Does the 0.003" difference in contact tail length affect PCB compatibility?

A: No. The contact tail length difference (0.157" vs. 0.154") falls within standard PCB through-hole tolerance specifications and does not affect solder joint formation or mechanical stability in standard applications.

Q: Are both parts compliant with current environmental regulations?

A: Yes. Both the A-TB508-OQ24CV and 1755956 are ROHS3 compliant and REACH unaffected, meeting current environmental and hazardous substance regulations for industrial component applications.

Q: What is the difference in housing material between these two parts?

A: The A-TB508-OQ24CV uses Thermoplastic housing material, while the 1755956 uses Polyamide (PA) Nylon. Both materials achieve UL94 V-0 flammability classification and are suitable for the specified operating temperature range.