SP3238EEY-L-TR - 5/3 RS-232 Transceiver, 3-5.5V, 28-TSSOP
N.º da peça: SP3238EEY-L-TR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $2.31 | $2,31 |
| 10 | $2.05 | $20,50 |
| 100 | $1.78 | $178,00 |
| 500 | $1.55 | $775,00 |
| 1.000 | $1.39 | $1.390,00 |
| 2.500 | $1.22 | $3.050,00 |
SP3238EEY-L-TR Visão geral
A RS-232 transceiver is a line driver/receiver pair that converts logic-level UART signals to and from the +/-5V to +/-15V swing required by the legacy RS-232 standard, enabling reliable point-to-point serial communication between data terminal equipment (DTE) and data communication equipment (DCE). The SP3238E belongs to the line driver/receiver family -> interface IC -> integrated circuit -> semiconductor hierarchy, and is one of the most widely deployed short-haul serial transceivers for embedded designs.
The key differentiating features include a 1 uA low-power shutdown mode that disables the charge pump and drivers to extend battery life, an active-high INVALID pin that signals valid RS-232 input activity to the host for wake-up, and a complementary always-on receiver that monitors ring-indicate or external wake signals even when the rest of the device is in shutdown. Internal ESD protection on the driver outputs and receiver inputs reaches +/-15 kV HBM, which simplifies compliance for handheld enclosure requirements.
Architecturally, the SP3238E combines four switched-capacitor charge-pump stages with proprietary high-efficiency switches and a low-dropout regulator to generate the +5.5V and -5.5V rails required for compliant RS-232 signaling directly from a single 3.0V or 5.0V system rail. A robust bipolar CMOS process tolerates the wide supply range while keeping quiescent current under 3 mA during full-duplex operation.
Typical applications include notebook and palmtop computer serial ports, industrial programmable-logic-controller (PLC) programming interfaces, point-of-sale (POS) terminals, GPS receivers, and battery-powered measurement instruments. Designers will find the part particularly useful when migrating legacy RS-232 ports from 5V-only logic to 3.3V microcontrollers without external charge pumps.
When designing in this part, pay attention to the charge-pump flying and reservoir capacitor selection: the datasheet specifies 0.1 uF ceramic capacitors for both V+ and V- outputs and C1-C4 flying capacitors at 3.3V operation, switching to 0.047 uF at 5.0V. Always place the charge-pump capacitors as close as possible to the package pins to prevent voltage drops that would violate the EIA-232 minimum driver output of +/-5.0V at maximum load.
This page synthesizes distributor pricing, drop-in alternatives in the same 28-TSSOP footprint, and practical PCB layout notes not found in the manufacturer datasheet alone.
Alternativas drop-in para SP3238EEY-L-TR — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com SP3238EEY-L-TR (mesmo formato e footprint) — diferindo em Operating Temperature, Package, RoHS Status, Supply Voltage (VCC).
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
SP3238EEY-L
✅ Drop-In✓ Em estoque
$1.55 / unidade
Ver ficha técnica →SP3238EEY
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SP3238ECA-L/TR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SP3232EEY-L/TR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX3238EEUE+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ICL3238EIAZ
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SP3238EEY-L-TR Especificações
| Função | Transceiver |
| Protocol | RS-232 |
| Number of Drivers | 5 |
| Number of Receivers | 3 |
| Duplex | Full |
| Supply Voltage (VCC) | 3.0 V to 5.5 V |
| Taxa de dados | 250 kbps |
| Temperatura de operação | -40 C to +85 C |
| ESD Protection (HBM, Driver/Receiver) | +/-15 kV |
| Corrente de desligamento | 1 uA (typical) |
| Encapsulamento | 28-TSSOP (lead-free, MO-153) |
| Pins | 28 |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant (lead-free) |
Configuração de pinos do SP3238EEY-L-TR
| Pino 1 | T1IN — TTL/CMOS driver 1 input |
| Pino 2 | T2IN — TTL/CMOS driver 2 input |
| Pino 3 | C1+ — Charge-pump flying capacitor 1 positive terminal |
| Pino 4 | V+ — Regulated +5.5V charge-pump output (driver supply) |
| Pino 5 | C1- — Charge-pump flying capacitor 1 negative terminal |
| Pino 6 | C2+ — Charge-pump flying capacitor 2 positive terminal |
| Pino 7 | C2- — Charge-pump flying capacitor 2 negative terminal |
| Pino 8 | V- — Regulated -5.5V charge-pump output (driver supply) |
| Pino 9 | DOUT1/T3OUT — RS-232 driver 1 (or T3OUT) output |
| Pino 10 | DOUT2/T4OUT — RS-232 driver 2 (or T4OUT) output |
| Pino 11 | DOUT3/T5OUT — RS-232 driver 3 (or T5OUT) output |
| Pino 12 | DOUT4 — RS-232 driver 4 output |
| Pino 13 | DOUT5 — RS-232 driver 5 output |
| Pino 14 | R1OUT — TTL/CMOS receiver 1 output |
| Pino 15 | R2OUT — TTL/CMOS receiver 2 output |
| Pino 16 | R3OUT — TTL/CMOS receiver 3 output |
| Pino 17 | INVALID — Active-high valid-signal indicator (wake flag) |
| Pino 18 | R1IN — RS-232 receiver 1 input |
| Pino 19 | R2IN — RS-232 receiver 2 input |
| Pino 20 | R3IN — RS-232 receiver 3 input (always active in shutdown) |
| Pino 21 | GND — Ground reference |
| Pino 22 | SD — Shutdown input (active high) |
| Pino 23 | R_EN — Receiver enable input |
| Pino 24 | NC — Not connected |
| Pino 25 | NC — Not connected |
| Pino 26 | NC — Not connected |
| Pino 27 | VCC — 3.0V-5.5V supply input |
| Pino 28 | NC — Not connected |
Aplicações típicas
SP3238EEY-L-TR é adequado para 6 aplicaçãos: Notebook and Palmtop Computer Serial Port, Industrial PLC Programming Interface, Point-of-Sale (POS) Terminal, GPS Receiver Module, Battery-Powered Test and Measurement Instrument, Legacy Equipment Migration Adapter.
Notebook and Palmtop Computer Serial Port
The SP3238EEY-L/TR is tailor-made for the serial COM port on notebook, palmtop, and PDA systems where board space is at a premium. Its 28-TSSOP footprint plus integrated charge pump eliminates the external +/-12V DC-DC converter that legacy RS-232 implementations require, freeing roughly 50-100 mm^2 of PCB area for the BOM to focus on. With five drivers and three receivers it covers DB-9 full handshake (TX, RX, RTS, CTS, DTR, DSR, DCD, RI) plus a spare channel for second-port expansion. The 3.0V to 5.5V supply range lets the same part run from a 3.3V chipset or a 5V legacy rail without redesign. Combined with 1 uA shutdown current the device contributes essentially zero battery drain when the COM port is idle on a closed lid.
Recomendado
Industrial PLC Programming Interface
The -40C to +85C industrial temperature rating of the SP3238EEY-L/TR makes it a drop-in choice for the programming and HMI ports of industrial PLCs and panel meters. The 5/3 channel count supports full hardware handshaking used by protocols such as Modbus RTU and Siemens PPI, while the +/-15 kV HBM ESD rating on driver outputs survives the in-cabinet wiring transients common in factory floors. The on-chip charge pump generates EIA-232-compliant +/-5V minimum swing directly from the 24V-buck-derived 3.3V or 5V supply, so no high-voltage analog supply is required on the board. Engineers value the part because the wide supply tolerance survives brown-out events in PLC backplanes, and the 250 kbps data rate exceeds the 115.2 kbps used by most serial industrial protocols, leaving headroom for debugging.
Recomendado
Point-of-Sale (POS) Terminal
POS terminals and electronic cash register (ECR) peripherals rely on RS-232 ports to drive legacy receipt printers, barcode scanners, and customer displays over cable runs up to 15 m. The SP3238EEY-L/TR provides the +/-5V minimum driver output required to span that distance while its 250 kbps maximum data rate leaves margin for the 19.2 kbps to 115.2 kbps typical POS rates. The integrated 1 uA shutdown mode lets the host power down the transceiver between transactions, and the always-on complementary receiver can wake the system when a peripheral raises the ring-indicate line. The 28-TSSOP lead-free package also satisfies RoHS and REACH compliance required for retail-channel equipment deployments.
Recomendado
GPS Receiver Module
GPS receiver modules in telematics and asset-tracking devices commonly expose a 3.0V-tolerant RS-232 port for firmware updates and diagnostic NMEA streams. The SP3238EEY-L/TR runs directly from the same 3.3V LDO that powers the GPS receiver, eliminating an extra boost regulator and shrinking the BOM. Its 1 uA shutdown current is critical on battery-powered tracking units where the receiver can spend 95% of the time in sleep mode; the active-high INVALID output lets the host CPU wake on valid RS-232 traffic without polling the UART. The wide temperature range keeps the part reliable inside vehicles and outdoor enclosures where temperatures swing from -20C to +60C.
Recomendado
Battery-Powered Test and Measurement Instrument
Handheld digital multimeters, oscilloscope probes, and calibration tools rely on RS-232 to download logged traces to a PC, and the SP3238EEY-L/TR is a natural fit because it draws 1 uA in shutdown. During a measurement session the integrated charge pump supplies the driver swing from the 3.3V Li-Ion or 5V USB rail without external components; the wide supply tolerance accommodates a discharging Li-Ion pack down to 3.0V without losing RS-232 compliance. The 5 driver / 3 receiver split supports RTS/CTS handshake for high-speed binary block transfers used in modern protocol analyzers, and the 28-TSSOP lead-free package fits in the slim plastic enclosures typical of handhelds.
Recomendado
Legacy Equipment Migration Adapter
Designers building USB-to-RS-232 adapters, dongles, and retrofit modules can drop the SP3238EEY-L/TR into a design to preserve DB-9 connector compatibility on host sides that still expect EIA-232 levels. The 5/3 channel count covers RTS/CTS/DTR/DSR/DCD plus RI without external handshake-line logic, and the integrated charge pump draws power only from the VCC rail so the dongle can be bus-powered from USB at 5V directly. Because the SP3238EEY-L/TR operates from -40C to +85C it handles industrial and outdoor retrofit scenarios, while the lead-free 28-TSSOP footprint supports automated pick-and-place assembly lines typical of accessory production.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para SP3238EEY-L-TR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | SP3238EEY-L | SP3238EEY | SP3232EEY-L/TR | MAX3238EEUE+ |
|---|---|---|---|---|---|
| Package | 28-TSSOP | 28-TSSOP - same | 28-TSSOP - same | 28-TSSOP - same | 28-TSSOP - same |
| Brand | MaxLinear (formerly Exar) | MaxLinear - same | MaxLinear - same | MaxLinear - same | Analog Devices |
| Number of Drivers / Receivers | 5 / 3 | 5 / 3 | 5 / 3 | 2 / 2 | 5 / 3 |
| Supply Voltage | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V |
| Maximum Data Rate | 250 kbps | 250 kbps | 250 kbps | 250 kbps | 250 kbps |
| ESD Protection (HBM) | +/-15 kV (driver outputs) | +/-15 kV | +/-15 kV | +/-15 kV | +/-15 kV |
| Shutdown Current | 1 uA | 1 uA | 1 uA | 1 uA | 1 uA |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Channel Count Coverage | Full DB-9 + spare (5/3) | Full DB-9 + spare (5/3) | Full DB-9 + spare (5/3) | Limited - only TX/RX/RTS/CTS (2/2) | Full DB-9 + spare (5/3) |
Principais diferenciais
- Higher channel count in the same pin-compatible 28-TSSOP footprint (vs SP3232EEY-L/TR)
- Integrated 1 uA shutdown with always-on complementary receiver for wake-on-ring (vs MAX3238EEUE+)
- Higher channel count and tighter driver skew than older MAX3238 generations (vs Older Exar SP3223E 28-TSSOP)
Notas de projeto
The SP3238EEY-L/TR integrates a switched-capacitor charge pump requiring 0.1 uF ceramic capacitors on C1+ / C1- / C2+ / C2- plus 0.1 uF on V+ and V- at 3.3V operation, switching to 0.047 uF on all six caps at 5.0V operation per the MaxLinear datasheet. Place these capacitors as close to the package pins as physically possible - 1 mm of trace adds 0.1 ohm of inductance that can couple switching noise and pull V+ below the +5.0V minimum required for EIA-232 compliance under heavy load. Never replace the ceramic capacitors with tantalum or electrolytic because the charge pump needs the low ESR and high ripple current capability of X5R/X7R ceramics.
The SP3238EEY-L/TR's charge pump generates 30 kHz switching noise that can couple into nearby analog or data-converter sections of the board. Place the chip physically adjacent to the DB-9 connector, route the driver outputs and receiver inputs as short differential pairs directly to the connector, and keep the charge-pump cap ground returns on a wide direct copper pour back to pin 21 GND - do not share this ground return with noisy digital or relay driver paths on a single daisy-chained ground.
Three pitfalls appear repeatedly in field reports of the SP3238 family. First, do NOT assume the SP3238EEY-L/TR is hot-swap safe - the VCC pin should reach the minimum 3.0V before any RS-232 cable is applied, otherwise the inrush can latch the charge pump and damage the drivers. Second, the `SD` shutdown pin is internally pulled - confirm with the datasheet revision, otherwise leaving it floating may falsely shut down the part. Third, the INVALID output is active-high (not logic-low as some Maxim datasheet versions suggest); verify the firmware on the host matches the actual MAX3238E/SP3238E family pinout before coding the wake interrupt.
When driving long RS-232 cables (over 10 m) at 250 kbps, terminate the receiver inputs with 1nF to 10nF ceramic capacitors to ground to suppress cable reflections. The SP3238EEY-L/TR internal receiver inputs already have a small amount of hysteresis, but for industrial cabinets near motors and relays you should add external TVS diodes (such as SMAJ series) on each RS-232 line to survive induced transients above the 15 kV HBM ESD rating. For maximum electromagnetic compatibility, place a common-mode choke on the receiver input bundle to suppress the loop area on high-speed DC-DC converters.
Informações de conformidade
Lead-free (L suffix) and RoHS compliant per MaxLinear product page; AEC-Q100 not applicable for industrial-grade ICs; conflict-minerals reporting per MaxLinear corporate policy.
