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Molex 0387008721 Equivalent & Substitute Parts
Part Overview
The Molex 0387008721 is a 21-circuit barrier block connector with 0.325" (8.26mm) pitch, designed for through-hole mounting with screw termination and captive plate. This component operates at 20A current rating and 300V voltage rating, supporting wire gauges from 12-22 AWG. The part is classified as obsolete, making identification of suitable substitutes essential for ongoing system maintenance and new design implementations where this connector type is specified.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 0387008721 |
| Manufacturer | Molex |
| Category | Terminal Blocks |
| Series | Beau 38700 |
| Terminal Block Type | Barrier Block |
| Number of Circuits | 21 |
| Pitch | 0.325" (8.26mm) |
| Current Rating | 20A |
| Voltage Rating | 300V |
| Wire Gauge Range | 12-22 AWG |
| Top Termination | Screws with Captive Plate |
| Bottom Termination | PC Pin |
| Barrier Type | 2 Wall (Dual) |
| Mounting Type | Through Hole |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution for the Molex 0387008721 is determined by strict equivalence across the following critical parameters:
- Circuit Configuration: 21 circuits with matching pitch of 0.325" (8.26mm)
- Electrical Ratings: 20A current rating and 300V voltage rating
- Termination Style: Screw termination with captive plate on top; PC pin on bottom
- Barrier Configuration: 2 Wall (Dual) barrier type
- Mounting: Through-hole mounting compatibility
- Mechanical Compatibility: Single-row configuration with identical connector footprint
The substitute part Molex 0387007521 maintains all critical electrical and mechanical parameters required for direct substitution. The primary distinction is product status: the substitute is active production, whereas the original part is obsolete. Wire gauge compatibility differs slightly (14-22 AWG vs. 12-22 AWG), representing a narrower but overlapping range suitable for most applications within the specified current and voltage envelope.
Parameter Comparison
| Parameter | 0387008721 (Original) | 0387007521 (Substitute) |
|---|---|---|
| Manufacturer | Molex | Molex |
| Series | Beau 38700 | Beau 38700 |
| Terminal Block Type | Barrier Block | Barrier Block |
| Number of Circuits | 21 | 21 |
| Pitch | 0.325" (8.26mm) | 0.325" (8.26mm) |
| Current Rating | 20A | 20A |
| Voltage Rating | 300V | 300V |
| Wire Gauge Range | 12-22 AWG | 14-22 AWG |
| Top Termination | Screws with Captive Plate | Screws with Captive Plate |
| Bottom Termination | PC Pin | PC Pin |
| Barrier Type | 2 Wall (Dual) | 2 Wall (Dual) |
| Mounting Type | Through Hole | Through Hole |
| Color | Black | Black |
| Operating Temperature | 110°C | -40°C ~ 130°C |
| Material - Insulation | Thermoplastic | Thermoplastic |
| Product Status | Obsolete | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
The Molex 0387007521 is the direct substitute for the obsolete Molex 0387008721. Both components are ROHS3 compliant and share identical electrical ratings, circuit configuration, and mechanical footprint. The substitute part is in active production status, ensuring availability for new designs and replacement applications.
The substitute offers an extended operating temperature range (-40°C to 130°C versus 110°C maximum for the original), providing greater thermal margin in demanding environments. The wire gauge specification of 14-22 AWG on the substitute is narrower than the original 12-22 AWG range; applications requiring 12 AWG termination must evaluate alternative solutions or confirm compatibility with the substitute's minimum gauge specification.
Both parts carry identical electrical certifications and compliance ratings, supporting direct substitution in applications where the original part was specified.
Frequently Asked Questions (FAQ)
Q: Can the Molex 0387007521 be used as a direct replacement for the 0387008721?
A: Yes. Both parts share identical circuit count (21), pitch (0.325"), electrical ratings (20A, 300V), termination style, and mounting configuration. The substitute is the manufacturer-recommended replacement for the obsolete original part.
Q: What is the difference in wire gauge compatibility?
A: The original part accepts 12-22 AWG wire, while the substitute accepts 14-22 AWG. Applications using 12 AWG conductors must confirm compatibility with the substitute or identify alternative solutions.
Q: Are there any compliance or certification differences?
A: Both parts are ROHS3 compliant with identical MSL ratings (1 - Unlimited). No compliance differences exist between the original and substitute.
Q: Does the extended operating temperature range of the substitute affect compatibility?
A: No. The substitute's operating range of -40°C to 130°C encompasses the original part's 110°C maximum, providing equal or superior thermal performance in all applications where the original was used.
Q: What is the packaging difference between these parts?
A: The original part was supplied in unspecified packaging. The substitute is supplied in bulk packaging, which may affect procurement and handling procedures but does not alter electrical or mechanical compatibility.
Q: Are both parts from the same manufacturer series?
A: Yes. Both parts belong to the Molex Beau 38700 series, confirming design and manufacturing continuity.
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