<p>Fax machines remain a standard piece of office and business equipment across legal, healthcare administration, logistics, and retail back-office environments. Behind the familiar exterior, the internal interconnect architecture is more involved than it first appears: a main control PCB must interface with a paper-feed motor, a scanning CIS (contact image sensor) module, a thermal or inkjet print engine, a keypad and display, and an internal power-distribution section. Each of these subsystems depends on reliable wire-to-board interconnection, and the selection trade-offs are specific enough to warrant a closer look.</p>
<h2>Application Context & Design Challenge</h2>
<p>At SCONDAR, we frequently receive design-in inquiries from office-equipment manufacturers evaluating alternative wire-to-board connectors for fax machine mainboards and harnesses. The recurring challenges in this application are consistent:</p>
<ul>
<li><strong>Mixed current levels</strong> — most links are signal-level (under 1A) for sensors, keypad, and display, while the paper-feed and cutter motors draw 2–3A. A single connector family rarely covers the whole board.</li>
<li><strong>Limited but not extreme board space</strong> — office equipment is not as space-constrained as wearables, but PCB real estate still drives cost, so pitch and pin density matter.</li>
<li><strong>Static operating environment</strong> — a desktop fax machine experiences negligible vibration, so friction-lock or positive-latch retention is sufficient; heavy positive-lock mechanisms are unnecessary weight and cost.</li>
<li><strong>Assembly volume</strong> — business equipment is produced in volume, so crimp consistency and, where applicable, IDC termination speed directly affect harness cost.</li>
</ul>
<h2>SCONDAR Product Matching for This Application</h2>
<p>For fax machine harness designs, SCONDAR’s wire-to-board connector portfolio covers the 2.0mm to 2.54mm pitch range that dominates office-equipment PCB layouts, with PCB-footprint compatibility to widely used industry standards such as JST PH, Hirose DF11, TE AMP CT, KK 254, and JST XH. The series we typically recommend for fax machine mainboards and internal harnesses are:</p>
<ul>
<li><strong>SCT2001 (JST PH compatible)</strong> — general signal and low-current power distribution on the main control board; boxed shroud prevents mis-mating. Rated 2A at 2.0mm pitch.</li>
<li><strong>SCT2011 (Hirose DF11 compatible)</strong> — high-density control-board I/O where pin count is tight; dual-row arrangement within a 5mm width roughly doubles signal count versus a single-row connector at the same footprint. Rated 3A at 2.0mm pitch.</li>
<li><strong>SCT2541 (KK 254 compatible)</strong> — economical high-density interconnection for internal devices such as copiers and fax equipment; dual-cantilever terminals with friction lock. Rated 3A at 2.54mm pitch.</li>
<li><strong>SCT2501 (JST XH compatible)</strong> — double-leaf contact for power and peripheral links; the 4-pin version conforms to JEMA HA terminal standards. Rated 3A at 2.5mm pitch. (Note: the JST XH series is a 2.5mm pitch, not 2.54mm.)</li>
<li><strong>SCT2007 (TE AMP CT compatible)</strong> — available in IDC or crimp termination; TE’s own application notes list PC, printer, and fax among target equipment, making it a natural fit where harness volume assembly benefits from IDC speed. Rated 3A at 2.0mm pitch.</li>
</ul>
<h2>Technical Specification Overview</h2>
<table>
<thead>
<tr>
<th>SCONDAR Series</th>
<th>Original Part Reference</th>
<th>Pitch</th>
<th>Current Rating</th>
<th>Voltage Rating</th>
<th>Temp. Range</th>
<th>Termination</th>
</tr>
</thead>
<tbody>
<tr>
<td>SCT2001</td>
<td>JST PH</td>
<td>2.0mm</td>
<td>2A</td>
<td>250V</td>
<td>-25°C ~ +85°C</td>
<td>Crimp</td>
</tr>
<tr>
<td>SCT2011</td>
<td>Hirose DF11</td>
<td>2.0mm (dual-row)</td>
<td>3A</td>
<td>250V</td>
<td>-25°C ~ +85°C</td>
<td>Crimp</td>
</tr>
<tr>
<td>SCT2541</td>
<td>KK 254</td>
<td>2.54mm</td>
<td>3A</td>
<td>250V</td>
<td>-25°C ~ +85°C</td>
<td>Crimp</td>
</tr>
<tr>
<td>SCT2501</td>
<td>JST XH</td>
<td>2.5mm</td>
<td>3A</td>
<td>250V</td>
<td>-25°C ~ +85°C</td>
<td>Crimp</td>
</tr>
<tr>
<td>SCT2007</td>
<td>TE AMP CT</td>
<td>2.0mm</td>
<td>3A</td>
<td>250V</td>
<td>-25°C ~ +85°C</td>
<td>IDC or Crimp</td>
</tr>
</tbody>
</table>
<p>All five series share a contact resistance of 20mΩ max, insulation resistance of 1000MΩ min, and housings rated UL94V-0. Withstanding voltage is 800V AC/minute for SCT2001 and 1000V AC/minute for the remaining four.</p>
<h2>Design-In Considerations: Mechanical & Process</h2>
<h3>Pitch and PCB Footprint</h3>
<p>Fax machine mainboards commonly standardize on 2.0mm, 2.5mm, and 2.54mm pitches. Because SCT2001, SCT2011, SCT2541, SCT2501, and SCT2007 are engineered to the land patterns of their respective reference series, most design-ins proceed without a PCB re-spin. The parameters to confirm are pitch, row and position count, header mounting height and orientation (top/side entry, SMT or through-hole), and polarization-key position.</p>
<h3>Current Derating and Motor Links</h3>
<p>Reserve the 2A-rated SCT2001 for signal and light-power paths, and route the 2–3A paper-feed and cutter-motor links through SCT2011, SCT2541, SCT2501, or SCT2007. As a general rule, keep the continuous load at or below roughly 80% of the rated current and select conductor size within the specified AWG window (#22–#28) to avoid thermal margin loss.</p>
<h3>Locking Mechanism for a Static Environment</h3>
<p>Unlike automotive or drone applications, a desktop fax machine sees essentially no shock or vibration. Friction lock (SCT2001, SCT2541) and the optional positive latch on the KK 254 family provide secure mating and clear mis-mating protection without adding the mass and cost of heavy positive-lock hardware. This keeps the harness serviceable while protecting against accidental disconnection during field maintenance.</p>
<h3>Crimp vs. IDC Process</h3>
<p>For the crimp series (SCT2001, SCT2011, SCT2541, SCT2501), quality is built around automated crimping consistency — we validate every termination by pull-out force and crimp-height checks on production equipment. For SCT2007 in its IDC configuration, no stripping is required; the conductor is pierced by a precision twin-slot contact, and every terminated assembly is confirmed by 100% continuity and contact-resistance testing.</p>
<p>When the design moves from component selection to volume production, SCONDAR also provides custom cable assembly services that combine these connectors with pre-terminated wires in specified lengths and configurations, which helps stabilize harness quality across large batches.</p>
<h3>Material and Flammability</h3>
<p>Housings use glass-filled PA66, LCP, or PBT with UL94V-0 flammability rating; contacts are phosphor-bronze or brass with tin or gold plating, selected according to signal sensitivity and lifecycle requirements. These materials are standard across the referenced series and support the office-environment temperature window of -25°C to +85°C.</p>
<h2>Quality Assurance & Supply Chain</h2>
<p>SCONDAR has operated as a connector and wire-harness manufacturer since 2008, with production under ISO 9001:2015 controls and product certifications including UL/cUL (file E538921) and SGS-verified RoHS and REACH compliance. Our automated production lines support an 80% automation rate, a 98.4% on-time shipment record, and engineering inquiry response within one hour. We have successfully delivered interconnect solutions to over 2,000+ global electronics and industrial equipment manufacturers since 2008.</p>
<h2>Frequently Asked Questions</h2>
<p><strong>How do I verify that a SCONDAR alternative is PCB-footprint compatible with the original connector?</strong></p>
<p>Each SCONDAR series is engineered to the same pitch, pin layout, header shroud dimensions, and PCB land pattern as its reference standard (JST PH, Hirose DF11, TE AMP CT, KK 254, JST XH). Request the SCONDAR footprint drawing and compare it against your existing PCB Gerber or land pattern — the parameters to match are pitch, row and position count, header mounting height and orientation, and polarization-key position. In most cases no PCB re-spin is required; we recommend a sample fit-check on a bare board before volume adoption.</p>
<p><strong>What is the expected long-term reliability of these connectors in an office environment?</strong></p>
<p>Office fax equipment operates in a benign, static, room-temperature environment that sits comfortably within the -25°C to +85°C rating of the listed series. With contact resistance specified at 20mΩ max and insulation resistance at 1000MΩ min, UL94V-0 housings, and terminations validated by pull-out-force / crimp-height (crimp) or 100% continuity / contact-resistance (IDC) testing, these connectors deliver stable service life across the equipment’s operating window. Proper current derating and correct AWG selection are the main levers for long-term stability.</p>
<h2>Next Steps</h2>
<p>Designing a new fax machine mainboard or refreshing an existing harness? Share your position counts, pitch constraints, and current requirements, or request a sample kit for in-house validation. When the design moves from selection to validation, SCONDAR’s application engineering team is available for design-in support and sample inquiries through our contact page.</p>
<p><a href=”https://www.scondar.com/contact/”>Contact SCONDAR’s application engineering team</a> for design-in support and sample inquiries.</p>