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Hirose Electric Co Ltd BM20B(0.8)-20DP-0.4V(53) — Mezzanine & Stacking Connectors

Hirose BM20B(0.8)-20DP-0.4V(53) Header, 20 Pos, 0.40mm Pitch

MPNBM20B(0.8)-20DP-0.4V(53)
Active

Hirose BM20 series header, outer shroud contacts, 20 positions, 0.016" (0.40mm) pitch, dual-row, surface mount, gold contact finish, 0.026" (0.65mm) height above board, 0.8mm mated stacking height, solder retention.

$1.3500Ref. price · indicative, final on quote
Hirose Electric Co Ltd BM20B(0.8)-20DP-0.4V(53) datasheet (PDF)
RoHSRoHS Compliant
SeriesBM20
Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for stock & sourcing questions
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent supplier — new & surplus connector stock· Listing updated Aug 2026

Specifications

BM20B(0.8)-20DP-0.4V(53) specifications
ParameterValue
SeriesBM20
MountingSurface Mount
Connector typeHeader, Outer Shroud Contacts
Height above board0.026\" (0.65mm)
Mated stacking heights0.8mm
Pitch0.016\" (0.40mm)
PackageTape & Reel (TR) Cut Tape (CT)
FeaturesSolder Retention
Contact finishGold
Rows2
Positions20

Product details

0.40mm Pitch Mezzanine Header for Tight Stack Heights

The Hirose BM20B(0.8)-20DP-0.4V(53) is a 20-position, dual-row header from the BM20 series, designed for board-to-board mezzanine connections where PCB real estate is at a premium. Its 0.016" (0.40mm) pitch is among the tightest in the mezzanine connector class, letting you route dense signal traces between two parallel boards without expanding the board footprint. The connector sits 0.026" (0.65mm) above the board and mates to a stacking height of 0.8mm — a z-height budget that fits slim handheld devices, camera modules, or sensor assemblies where every tenth of a millimeter counts. The outer shroud contacts guide alignment during mating and shield the signal pins from accidental stubbing.

SMT Footprint and Solder Retention

This keeps the header from lifting or shifting under the shear load of a mated cable or during thermal cycling. The Tape & Reel packaging (also available in Cut Tape) feeds directly into a pick-and-place line, which keeps assembly throughput high for volume builds.

Frequently asked questions

What is the pitch of BM20B(0.8)-20DP-0.4V(53)?

The pitch is 0.016" (0.40mm), which is the center-to-center spacing between adjacent contacts. This tight pitch allows dense signal routing on the PCB but requires careful trace width/spacing design and via placement within the keep-out zone.

What is the recommended mating connector for BM20B(0.8)-20DP-0.4V(53)?

This header mates with a Hirose BM20 series receptacle of the same position count and stacking height — look for a mating part with the same 0.8mm mated stacking height and 20-position, dual-row configuration. The outer shroud contacts on this header align with the receptacle's inner contact beams.

Where can I buy BM20B(0.8)-20DP-0.4V(53)?

This part is sourced to order against your BOM quantity.