SP385EEA-L/TR - 3.3V/5V RS-232 Transceiver, 2x Driver/Receiver | MaxLinear
N.º da peça: SP385EEA-L/TR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $1.85 | $1,85 |
| 10 | $1.62 | $16,20 |
| 100 | $1.35 | $135,00 |
| 500 | $1.18 | $590,00 |
| 1.000 | $1.05 | $1.050,00 |
SP385EEA-L/TR Visão geral
An RS-232 transceiver is a type of serial interface IC that translates logic-level (typically 0 V to VCC) UART signals on one side to the ±5 V to ±15 V single-ended voltage swings defined by the EIA-232 standard on the cable side. Transceivers sit at the physical-layer boundary of the data terminal equipment (DTE) / data circuit-terminating equipment (DCE) link, converting between the UART's CMOS/TTL domain and the higher-voltage cable domain so microcontrollers, FPGAs, or ASICs can communicate with PCs, modems, industrial controllers, and point-of-sale terminals. The SP385EEA-L/TR belongs to the SP200/SIPEX legacy family and is an enhanced, 3 V-capable upgrade of the original SP310A.
Key features include on-board charge-pump DC-DC converters that generate the ±RS-232 driver supplies from a single logic rail, four external charge-pump capacitors (typically 0.1 µF), and an ON/OFF (shutdown) input that tri-states the drivers for power management. The receivers remain active during shutdown so they can monitor incoming data while the system is idle. Driver outputs are protected against ±15 kV of ESD using the Human Body Model, and the part is rated for commercial and industrial temperature ranges.
Typical applications include battery-powered handheld terminals running from 3.3 V or 5 V single-rail supplies, industrial programmable logic controllers (PLCs), RS-232 ports on single-board computers and embedded MCUs, cable modem and set-top box control channels, point-of-sale / barcode scanner interfaces, and direct UART-to-DB9 front panels. The wide supply range (3.0 V to 5.5 V) lets a single BOM cover both 3.3 V MCU designs and legacy 5 V systems.
Alternativas drop-in para SP385EEA-L/TR — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
SP385ECA-L/TR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SP385ECT-L/TR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SP385EEA-L
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTC1385CSW#PBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTC1385ISW#PBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTC1385CSW#TRPBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SP385EEA-L/TR Especificações
| Função | RS-232 line transceiver (2 drivers / 2 receivers, full duplex) |
| Number of Drivers | 2 |
| Number of Receivers | 2 |
| Protocol | RS-232 / EIA-232 / EIA-562 |
| Taxa de dados | 120 kbps |
| Supply Voltage (single rail) | 3.0 V to 5.5 V (3.3 V or 5 V typical) |
| Supply Voltage Min (EIA-562 compliant) | 3.0 V |
| Supply Voltage Nom (EIA-232 compliant) | 5.0 V |
| Faixa de temperatura de operação | 0C to +70C (commercial) |
| Charge Pump Capacitors (external) | 4 x 0.1 uF (with +3 V supply) |
| ESD Protection (Driver Outputs, HBM) | ±15 kV |
| Transmitter Logic Input Thresholds | TTL/CMOS compatible |
| On/Off (Shutdown) Control | Yes (drivers tri-stated; receivers remain active) |
| Encapsulamento | 20-SSOP (0.209 in / 5.30 mm body width) |
| Tipo de montagem | Surface Mount |
| Lead Free / RoHS | Yes (per Sipex/MaxLinear product designation "L") |
Configuração de pinos do SP385EEA-L/TR
| Pino 1 | ON/OFF — Driver enable/shutdown control (logic high = drivers enabled, logic low = drivers tri-stated) |
| Pino 2 | C1+ — Charge-pump flying capacitor positive terminal 1 |
| Pino 3 | V+ — Positive charge-pump output (typically +5.5 V to +9 V) |
| Pino 4 | C1- — Charge-pump flying capacitor negative terminal 1 |
| Pino 5 | C2+ — Charge-pump flying capacitor positive terminal 2 |
| Pino 6 | C2- — Charge-pump flying capacitor negative terminal 2 |
| Pino 7 | V- — Negative charge-pump output (typically -5.5 V to -9 V) |
| Pino 8 | T2IN — Driver 2 logic input |
| Pino 9 | R2OUT — Receiver 2 logic output |
| Pino 10 | R2IN — Receiver 2 RS-232 input |
| Pino 11 | T2OUT — Driver 2 RS-232 output |
| Pino 12 | VCC — Single +3.3 V or +5 V supply input |
| Pino 13 | GND — Ground |
| Pino 14 | T1OUT — Driver 1 RS-232 output |
| Pino 15 | R1IN — Receiver 1 RS-232 input |
| Pino 16 | R1OUT — Receiver 1 logic output |
| Pino 17 | T1IN — Driver 1 logic input |
| Pino 18 | NC — Not connected |
| Pino 19 | NC — Not connected |
| Pino 20 | NC — Not connected |
Aplicações típicas
SP385EEA-L/TR é adequado para 7 aplicaçãos: 3.3 V MCU RS-232 COM Port, Industrial PLC RS-232 Service Port, Point-of-Sale / Barcode Scanner Interface, Battery-Powered Handheld / Cable Modem Set-Top Box, Embedded UART to DB-9 Front Panel, Instrumentation and Test Equipment Serial Control, Diagnostic / Console Port on Networking Equipment.
3.3 V MCU RS-232 COM Port
The SP385EEA-L/TR's ability to run from a single 3.0 V to 5.5 V supply while still meeting EIA-562 makes it the cleanest drop-in for 3.3 V microcontrollers that need to talk to legacy PCs or industrial controllers through a DB-9 port. With four 0.1 uF charge-pump caps the part generates ±EIA-562 driver swings from one rail, avoiding the charge-pump cost of a dual-supply design. The 120 kbps data rate covers typical UART links (115200 baud + overhead) on Cortex-M, PIC32, and AVR designs. Engineers pairing the transceiver with a 3.3 V MCU on a single PCB will find the part's small SSOP-20 footprint matches the layout of most SP200-series legacy designs.
Recomendado
Industrial PLC RS-232 Service Port
Programmable logic controllers (PLCs) and human-machine interfaces (HMIs) typically expose a 5 V RS-232 service port for commissioning via PCs and handheld programmers. The SP385EEA-L/TR's EIA-232-D/V.28 compliance at 5 V, combined with ±15 kV HBM ESD on driver outputs, prevents field failures from charged-cable discharge in industrial cabinets. Mounting in the 0.209 in SSOP-20 package, the transceiver survives retrofit upgrades when SP200-era stock is exhausted. Its ON/OFF pin tri-states drivers during firmware updates so the host unit can power down the upstream interface cleanly.
Recomendado
Point-of-Sale / Barcode Scanner Interface
Point-of-sale terminals and barcode scanners frequently run from 5 V internal rails while still needing robust ±15 kV ESD survivability on the RS-232 driver outputs that face the cable. The SP385EEA-L/TR's HBM-tested driver outputs and 120 kbps data rate comfortably handle scanner rates, and the EIA-232-D conformance ensures interoperability with legacy POS hosts in retail back-office settings. The shutdown ON/OFF pin lets the embedded host power the link down between transactions to limit battery drain on mobile terminals.
Recomendado
Battery-Powered Handheld / Cable Modem Set-Top Box
Single-rail 3.3 V operation is ideal for handheld diagnostics tools and cable/set-top box control channels where a single low-voltage rail is preferred. The SP385EEA-L/TR's 0.1 uF charge-pump capacitors (smaller than legacy 1 uF designs on SP310A boards) save critical PCB area, while the ON/OFF driver-disable function enables multi-mW savings between transactions. Cable modem diagnostic ports and set-top box control channels running EIA-232 at 115200 baud across ±15 kV of ESD-rugged cable runs are typical use cases.
Recomendado
Embedded UART to DB-9 Front Panel
Front-panel DB-9 debug and service ports on industrial PCs, factory automation controllers, and test equipment often bridge 3.3 V or 5 V logic UART pins to the cable. The SP385EEA-L/TR accepts CMOS/TTL logic levels directly, so it interfaces to a UART pin without level translators. EIA-232-D/V.28 compliance at 5 V preserves interoperability with off-the-shelf null-modem cables and PCs. Designers gain an SSOP-20 footprint common to many legacy transceivers, allowing layout-compatibility with multiple second-source parts.
Recomendado
Instrumentation and Test Equipment Serial Control
Lab instrumentation, bench-top multimeters, and oscilloscope command interfaces commonly rely on RS-232 at 5 V for firmware upload, GPIB-style SCPI control, and diagnostics. The SP385EEA-L/TR's 120 kbps operation is sufficient for these slow command channels; on-chip charge pumps remove the need for a DC-DC boost, preserving analog integrity inside the instrument. ±15 kV ESD handling prevents field returns when users hot-plug the serial cable. The 20-SSOP profile fits inside densely populated instrument motherboards.
Recomendado
Diagnostic / Console Port on Networking Equipment
Routers, switches, and small-cell base stations typically expose a 3.3 V RS-232 console port for out-of-band management. The SP385EEA-L/TR's 3.0 V minimum supply lets it operate directly from a switch-mode converter's 3.3 V output rail without a post-regulator. EIA-562 conformance is acceptable for management-console datarates (9600 to 115200 baud), and the 0.1 uF charge-pump caps free up board area in dense platforms. The shutdown pin supports Power over Ethernet power-saving modes.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para SP385EEA-L/TR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | SP385ECA-L/TR | SP385ECT-L/TR | LTC1385CSW#PBF |
|---|---|---|---|---|
| Brand | MaxLinear | MaxLinear | MaxLinear | Analog Devices |
| Package | 20-SSOP (5.30 mm) | 20-SSOP | 18-SOIC wide | 20-SSOP |
| Supply Voltage | 3.0 V to 5.5 V | 3.3 V only | 5 V only | 5 V only |
| Data Rate | 120 kbps | 120 kbps | 120 kbps | 120 kbps |
| Drivers / Receivers | 2 / 2 | 2 / 2 | 2 / 2 | 2 / 2 |
| On/Off (Shutdown) Pin | Yes (drivers tri-state) | Yes | No (ENABLE on LTC1385) | No (ENABLE on LTC1385) |
| Operating Temperature | 0C to +70C (commercial) | 0C to +70C | 0C to +70C | -40C to +85C (industrial) |
| Charge Pump Capacitors | 4 x 0.1 uF | 4 x 0.1 uF | 4 x 0.1 uF (per LTC1385 datasheet) | 4 x 0.1 uF |
Principais diferenciais
- Single 3.3 V to 5.5 V supply with built-in 0.1 uF-cap charge pump (vs LTC1385CSW#PBF)
- ON/OFF control can tri-state drivers while receivers remain active (vs LTC1385CSW#PBF)
- ±15 kV HBM ESD on driver outputs (vs SP385ECA-L/TR)
Notas de projeto
Place four 0.1 uF ceramic charge-pump capacitors (C1, C2 and reservoir caps on V+/V-) as close to the IC pins as possible. Use X7R or X5R dielectric, 16 V rating, with traces shorter than 5 mm to V+/V- pins to minimize ripple coupling back into VCC.
Although the SP385E datasheet states it is pin-compatible with the LTC1385, the LTC1385's ENABLE pin is functionally inverted versus the SP385EEA-L/TR's ON/OFF pin (one disables drivers with logic high, the other disables with logic low). Verify driver-enable logic polarity before swapping second-source boards.
Keep driver outputs T1OUT/T2OUT traces short and away from sensitive analog signals; drivers slew up to ±10 V at 30 V/us. Place 22 ohm series resistors close to the driver outputs on long cables to damp cable reflections and limit crosstalk to neighboring traces.
Continuous 120 kbps operation at full RS-232 swing dissipates approximately 60 mW typical per driver. With a theta_JA around 110 C/W in SSOP-20, junction rise is modest, but in sealed enclosures running both drivers at full rate derate by 30% to stay inside the commercial 0C to +70C ambient range.
Informações de conformidade
Sipex/MaxLinear datasheet -L suffix denotes lead-free / RoHS-compliant part. Industrial-temp equivalent is the LTC1385ISW#PBF (Analog Devices).
