SP485REP-L - 1/10 Unit Load RS-485 Transceiver | Exar
MPN: SP485REP-L ✓ AktifSP485REP-L Ringkasan
An RS-485 transceiver is an interface IC that combines a differential line driver and differential receiver, allowing equipment to communicate reliably over noisy, long cable runs. The half-duplex arrangement means the driver and receiver share the same differential pair, with direction controlled by the design. As a universal bus transceiver, the SP485REP-L belongs to the interface IC hierarchy: bus transceiver, line transceiver, physical-layer interface, and communication semiconductor.
The principal feature is its 1/10 unit-load receiver input. A lower unit load reduces the loading placed on a shared bus, while the specified typical input resistance of 150 kOhm helps preserve driver signal integrity. The result is support for more than 400 transceivers on a single transmission line. Half-duplex operation also reduces wiring complexity by sharing one bus pair rather than requiring separate transmit and receive pairs.
The device operates from a regulated 4.75 V to 5.25 V supply and includes a propagation delay of 60 ns, according to the published SP485REP-L specifications. Its 8-pin plastic DIP package is intended for through-hole assembly and prototyping rather than compact automated surface-mount production. The -40 C to +85 C operating range provides useful environmental headroom for industrial control, instrumentation, and communications equipment.
Typical uses include RS-485 field buses, industrial sensor networks, building automation equipment, remote monitoring stations, and data-acquisition systems. The high receiver impedance is particularly useful when many nodes share the same two-wire bus. Compared with a 1/8 or 1/4 unit-load transceiver, the 1/10 unit-load rating provides lower bus loading, while the trade-off is that the exact replacement must still match supply voltage, driver and receiver ratings, enable logic, and DIP pin mapping.
Designers should verify the manufacturer's pinout and termination requirements before layout, and should use a proper RS-485 line network with controlled stub lengths. The DIP footprint requires through-hole clearances and adequate lead-bend spacing. Because the verified data does not include detailed absolute-maximum ratings, driver output levels, or full timing tables, those values should be obtained from the manufacturer datasheet before final release.
This page consolidates the verified 1/10 unit-load, impedance, voltage, delay, temperature, package, pricing-directory, and replacement information with application guidance and package-conscious comparisons. It distinguishes confirmed facts from parameters that still require datasheet confirmation, helping engineers shortlist the SP485REP-L without overlooking PCB or bus-compatibility constraints.
Alternatif penggantian untuk SP485REP-L — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
Variasi di dalam seri ini
Model-series yang sama yang kompatibel dengan penggantian SP485REP-L (sama faktor bentuk dan footprint) — berbeda di dalam Mounting Type, Package, Data Rate, Duplex, Protocol.
SP485REP
✅ Drop-In ⚠️ Spesifikasi Tidak Disahkan📋 Alternatif referensi (tidak dalam katalog)
SP485R
✅ Drop-In ⚠️ Spesifikasi Tidak DisahkanKontak untuk harga
Lihat Datasheet →SP485
✅ Drop-InKontak untuk harga
Lihat Datasheet →SP485E
✅ Drop-In ⚠️ Spesifikasi Tidak DisahkanKontak untuk harga
Lihat Datasheet →SP485ECP
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
SP485REP-L Spesifikasi
| Product Type | Half-duplex RS-485/RS-422 transceiver |
| Receiver Unit Load | 1/10 unit load |
| Supported Transceivers per Line | More than 400 transceivers |
| Receiver Input Impedance | 150 kOhm typical |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Propagation Delay | 60 ns |
| Minimum Operating Temperature | -40 C |
| Maximum Operating Temperature | +85 C |
| Duplex Configuration | Half-duplex |
| Supported Standards | RS-485 and RS-422 |
| Paket | 8-pin plastic DIP |
| Tipe Mounting | Through-hole |
| Driver Configuration | 1/1 differential driver |
SP485REP-L 8-pin plastic dip Diamant Konfigurasi Panduan
Konfigurasi pin untuk SP485REP-L (8-pin plastic dip pakai pakai). Penomoran pin, fungsi, dan diagram koneksi ditetapkan dalam datasheet produsen. Lihatnya untuk footprint dan pedoman perpindahan paruh.
Tidak ada data diatribut pin yang tersedia untuk SP485REP-L.
Lihat ke: datasheet produk untuk konfigurasi pin penuh.
Aplikasi Umum
SP485REP-L cocok untuk 6 aplikasis: Industrial RS-485 Sensor Bus, Building Automation Controller, Remote Data-Acquisition System, Instrumentation and Test Equipment, LED Lighting Control Network, Telecommunications Remote Unit.
Industrial RS-485 Sensor Bus
The SP485REP-L fits industrial sensor and measurement networks where many field nodes share one twisted pair. Its 1/10 unit-load receiver and typical 150 kOhm input impedance allow more than 400 transceivers on a transmission line according to the manufacturer datasheet. Place the transceiver near the bus connector, route the differential pair as a controlled 120-ohm transmission line, and use the half-duplex enable interface to arbitrate transmit access. The main design benefit is reduced bus loading, while the tradeoff is the larger 8-pin through-hole footprint compared with a surface-mount transceiver.
Direkomendasikan
Building Automation Controller
The SP485REP-L is suitable for building-automation controllers that connect HVAC units, lighting modules, access controls, and environmental sensors over an RS-485 backbone. Its 150 kOhm typical receiver input impedance and 1/10 unit load reduce the effect of multiple terminated nodes on the bus. The 4.75 V to 5.25 V operating range also matches regulated 5 V control hardware. Designers should preserve the standard half-duplex direction-control arrangement, avoid long unterminated stubs, and verify the transceiver's 60 ns propagation delay against the complete network timing budget.
Direkomendasikan
Remote Data-Acquisition System
The SP485REP-L can connect a remote data-acquisition unit to sensors distributed across a production facility. Its more-than-400-node capability provides substantial capacity for densely populated measurement buses, while the 60 ns propagation delay supports moderate-rate half-duplex transfers. The device normally sits between the host serial interface and a protected RS-485 connector, with logic controlling receiver and driver enable states. For field cables, use twisted-pair wiring, common reference or isolation strategy appropriate to the installation, and surge protection selected for the actual cable length and environment.
Direkomendasikan
Instrumentation and Test Equipment
The SP485REP-L is useful in laboratory and field instrumentation that exposes a high-impedance multipoint measurement bus through a legacy RS-485 connector. The low 1/10 unit-load receiver input helps preserve signal quality when several instruments share a cable, and the -40 C to +85 C operating range supports industrial environments. Its 8-pin plastic DIP package favors serviceable, through-hole instrument construction. Engineers should nevertheless check grounding, isolation, coax-to-RS-485 transition details, and connector surge requirements because these protections are not contained in the transceiver itself.
Direkomendasikan
LED Lighting Control Network
The SP485REP-L can support addressable industrial LED-lighting controllers that distribute dimming, color, and enable commands over a wired RS-485 trunk. The 1/10 unit-load receiver allows numerous lighting nodes to share the same pair without heavily loading the driver, and the 60 ns propagation delay is useful for command-oriented networks rather than high-bandwidth streaming. A controller typically uses the driver during command transmission and the receiver for acknowledgements. Keep branch stubs short, terminate the trunk as specified, and provide local decoupling and protection at exposed cable connectors.
Direkomendasikan
Telecommunications Remote Unit
The SP485REP-L is applicable to telecommunications remote monitoring units that connect alarm, power, and environmental subsystems over an RS-485 backplane. Its low receiver loading is valuable when many monitored interfaces converge on one bus, while half-duplex operation limits wiring to a single differential pair. The 4.75 V to 5.25 V supply supports conventional 5 V equipment, but a -40 C to +85 C range may not satisfy every outdoor installation. For such deployments, confirm the exact environmental rating, add isolation where ground offsets are possible, and apply standards-compliant surge protection at the line interface.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk SP485REP-L — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | SP485REP | SP485R | SP485 | SP485E | SP485ECP |
|---|---|---|---|---|---|---|
| Brand | Exar Corporation | Exar Corporation | Exar Corporation | Exar Corporation | Exar Corporation | Exar Corporation |
| Package | 8-pin plastic DIP | 8-pin plastic DIP - same | 8-pin plastic DIP - same | 8-pin plastic DIP - same | 8-pin plastic DIP - same | 8-pin plastic DIP - same |
| Duplex Configuration | Half-duplex | Half-duplex | Half-duplex | Half-duplex | Half-duplex | Half-duplex |
Diferensiator Kunci
- Lower receiver loading for dense multipoint buses (vsSP485R)
- High receiver input impedance (vsSP485)
- Large-node RS-485 capability in a through-hole package (vsSP485E)
Catatan Desain
Route the SP485REP-L differential pair as a controlled transmission line and keep branch stubs short. The 1/10 unit-load receiver reduces loading on the shared bus, but it does not correct poor topology. Keep the transceiver close to the connector, maintain a continuous ground reference where the installation permits, and place termination only at the physical ends of the trunk. Confirm the actual pin assignments from the manufacturer datasheet before committing the eight-pin DIP footprint.
The verified operating range is 4.75 V to 5.25 V, so the SP485REP-L requires a regulated 5 V rail within those limits. Place local supply decoupling close to the device and account for current drawn by the driver, receiver, and external bus-termination network. Do not substitute a wider nominal voltage description for the documented operating range; validate minimum and maximum rail conditions across temperature and cable loading.
Do not treat the more-than-400-node capability as permission for arbitrary cabling. Network capacity still depends on cable length, data rate, termination, topology, grounding, and transceiver timing. The published 60 ns propagation delay must be included in the end-to-end protocol budget, and the half-duplex direction-control logic must prevent bus contention. The SP485REP-L is not inherently isolated, so applications with large ground-potential differences need an external isolation strategy.
Informasi Konformitas
The supplied search results do not provide explicit RoHS, REACH, lead-free, halogen-free, conflict-minerals, or AEC-Q100 statements. The -L ordering suffix and the 2009 Exar-format datasheet revision do not by themselves establish current compliance, so those statuses remain unknown.
