J.S.T. B20B-XADSS-N-ALFSN

Mfr. Part

B20B-XADSS-N-ALFSN

Manufacturer

J.S.T. (Japan Solderless Terminals). Y-IC is a quality authorized distributor of J.S.T. We deliver genuine J.S.T. products with reliable supply, fast service, and professional technical support.

Detailed Description

20-position board header from the J.S.T. XA family. Single-row, shrouded, polarized, through-hole vertical header designed for wire-to-board connections on control and power boards. Tin-over-nickel plated posts for stable soldering and long-term conductivity. Lead-free, RoHS compliant variant. Provided parameters indicate Main Category: Integrated Circuits (ICs), Small Classification: Specialized ICs, and Package/Case: 607; please use the electrical and mechanical details below for engineering fit.

Key Features

20 positions, single-row, 2.5 mm pitch class (XA family)

Shrouded, polarized housing to prevent mis-mating

Secure mating ramp; stable retention with matching XA housings and crimp terminals

Through-hole vertical mounting; robust solder tails for wave or hand soldering

Tin-over-nickel plated copper alloy contacts for low contact resistance

Lead-free, RoHS compliant finish

High mating durability; suitable for production environments

Large available quantity for immediate builds (inventory listed: 500200)

Key Advantages

Simple, reliable wire-to-board connection with clear keying

Easy assembly and rework; strong solder joints on THT posts

Good electrical performance for low-to-mid power signals

Compact footprint for dense boards; 2.5 mm pitch class balances size and current

Broad ecosystem of matching JST housings and crimp contacts

Proven JST quality and global support via Y-IC

Packaging

Type: Board header, single-row, through-hole, vertical

Housing material: High-temperature, UL94 V-0 rated thermoplastic (typical PBT/PA for XA family)

Contact material: Copper alloy with nickel barrier and tin plating

Size (approximate, 20 circuits): length ~50–52 mm; width ~6–8 mm; height ~8–10 mm; tail length ~3–4 mm (check datasheet for exact)

Pin configuration: 20 straight square posts, keyed shroud; polarized entry to prevent mis-insertion

Thermal characteristics: typical operating range −25°C to +85°C; high-temp soldering compatible housing

Electrical properties (typical for JST XA family; verify per datasheet): current rating up to ~3 A per contact (depending on wire and temperature), contact resistance ≤10 mΩ, insulation resistance ≥1000 MΩ, withstand voltage ~1000 VAC for 1 minute

Package / Case: 607 (as provided in parameters; use for internal catalog reference)

Lifecycle

Status: Active production for standard XA family headers. Not nearing discontinuation based on current industry data.

Equivalent or alternative models (verify exact fit and mating parts per board layout):

- B20B-XADSS-N (same base without ALFSN suffix)

- B20B-XADSS-1N (boss or post variant, depending on mounting hole)

- B20B-XADSS-N-A (alternate locking feature or guide code)

- B20B-XADES-N-ALFSN (side-entry shroud variant within XA family)

- Series-position variations: B18B-XADSS-N-ALFSN, B16B-XADSS-N-ALFSN, B14B-XADSS-N-ALFSN, etc. (same family, different circuits)

- Matching housings and terminals: XAP-20V housing; SXA series crimp terminals (select wire gauge-specific part)

If you need an exact drop-in cross or different orientation/plating, contact our Y-IC sales team via our website for a fast match and full compatibility review.

Key Application Areas

Home appliances control boards and sensor harnesses

Industrial controllers, PLC I/O, and interface boards

HVAC systems, power and fan control modules

LED drivers, lighting control gear

Office equipment and printers

Automotive interior electronics (non-safety critical), infotainment modules

Consumer electronics, audio devices, small power supplies

Test and measurement equipment

Datasheet

Y-IC hosts the most authoritative datasheet for this model. Download the datasheet now on this product page to get exact dimensions, plating codes, mating parts, and ratings.

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