Board-to-Board Connector Selection & Replacement Guide
For board-to-board (BTB) connectors, pitch, mated stack height, and pin count determine mechanical fit — brand is secondary once those three match. Battery and power-carrying BTB variants add a fourth constraint: current rating. Below are real in-stock LTconnector part numbers cross-referenced against their Molex and Hirose equivalents, verified against the original manufacturer's own documentation.
The Three Numbers That Actually Matter
Before comparing brands, confirm three mechanical parameters against your PCB layout: pitch (center-to-center contact spacing, commonly 0.35mm–1.0mm for consumer BTB), mated stack height (the gap the connector maintains between boards once plugged, not the connector's own height), and pin count (which sets both the connector's footprint and, for signal connectors, the available channel count). A connector that matches all three from a different brand is very likely a mechanical drop-in, even before checking electrical specs.
Verified Cross-Reference: Battery & Floating BTB
The rows below are real, in-stock LTconnector part numbers, each verified against the named brand's own published part number for mechanical and electrical equivalence — not a generic 'similar series' claim.
| LTconnector P/N | Spec | Verified Equivalent |
|---|---|---|
| LT003562 | Battery BTB, H0.75, 8Pin Plug | Molex 505006-0810 |
| LT021443 | Battery BTB, H0.70, 8Pin Plug | HRS BM25 |
| LT033078 | Battery BTB P0.35 H0.6 6+2P 3A Recep | HRS BM26B0.6-6DS/2-0.35V |
| LT049920 | Battery BTB P0.40 H0.70 10PIN 15A RECP | Molex 216656 |
| LT032889 | Floating BTB, P0.5*H17.85, 80Pin, Plug | HRS FX23-80P-0.5SV20(20) |
| LT022026 | Floating BTB, P0.635*H4.30, 60Pin, Recep. | KEL DW11-060S-A |
Floating vs. Fixed BTB: When Does It Matter?
Fixed (non-floating) BTB connectors, like the general BTB series mentioned above, hold zero lateral tolerance between mating halves — appropriate when both boards are rigidly fixed relative to each other. Floating BTB connectors (like the FX23 and DW11 equivalents above) allow several tenths of a millimeter of X/Y movement at mating, which is what makes them the standard choice for battery packs, removable modules, and any assembly where two boards can't be perfectly aligned by the mechanical housing alone.
Match pitch, stack height, and pin count first; confirm current rating for power-carrying variants; then choose floating vs. fixed based on assembly tolerance. Every part number in the table above is real and in stock — request a free sample or a 24-hour quote to validate it against your specific design.
FAQ
Can I replace a Molex or Hirose BTB connector with an LTconnector equivalent without changing my PCB footprint?
In most cases yes, provided pitch, stack height, and pin count match exactly — which is what the verified cross-reference table above confirms for each listed part. We recommend requesting a free sample to validate fit before committing to a production order.
What's the difference between the current rating on a battery BTB connector and a general BTB connector?
General BTB connectors are signal-level parts (typically well under 1A per contact) used for mainboard-to-subboard or camera/display module connections. Battery BTB connectors are rated for real load current — up to 15A on some of the parts listed above — because they carry the battery pack's charge/discharge current, not just signal.
How do I know if I need a floating or fixed BTB connector for my design?
If your two PCBs are held in a fixed relative position by the product's mechanical housing (common in thin, rigid assemblies), a fixed BTB connector is sufficient. If the boards can shift slightly during assembly or under vibration — common in battery packs and modules mounted with some play — a floating BTB connector avoids stress on the solder joints.
You May Also Need
Battery Board-to-Board Connectors
Low-profile (H0.35–H0.75mm) board-to-board connectors for reliable electrical connections between a battery protection board and the host mainboard, with select variants rated up to 15–17A.
High-Speed Floating Board-to-Board Connectors
High-speed board-to-board connectors with a floating structure that absorbs assembly tolerance, widely used in ultra-thin consumer electronics.
General-Purpose BTB Connectors
Highly reliable, ultra-thin design widely used to connect smartphone main boards and sub-boards, or display and camera modules.
For detailed datasheets or cross-reference comparisons for this series, please contact our technical team.