MCP2120T-I/SL - IrDA Infrared Encoder/Decoder, 14-SOIC | Microchip
N.º da peça: MCP2120T-I/SL ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $2.1 | $2,10 |
| 10 | $1.82 | $18,20 |
| 100 | $1.55 | $155,00 |
| 500 | $1.32 | $660,00 |
| 1.000 | $1.18 | $1.180,00 |
MCP2120T-I/SL Visão geral
An infrared (IR) encoder/decoder is a type of interface IC that bridges a digital UART to an optical transceiver, translating asynchronous serial bytes into IrDA-standard pulse waveforms (typically a 3/16 pulse-width-modulated bit stream at lower baud rates, and a 1.6 µs pulse rate at 115.2 kbaud). It belongs to the wider family of interface ICs, which sit between processor peripherals and external transceivers; within that family it is a specialized serializer/baud-rate adapter for cable-free IR data links rather than a voltage regulator or generic logic gate.
Key features include IrDA Physical Layer Specification 1.3 compliance, 312.5 kbaud maximum data rate, CMOS process technology, fully-static operation (no minimum clock restriction), compatibility with any standard UART, and integration with a wide range of IrDA-compliant transceivers. The MCP2120T-I/SL is also designed to interface directly with Microchip's MCP2150 IrDA protocol stack companion and with off-board optoelectronics such as the TFDS4500 / TFDU4100 series IR transceivers.
Typical applications include IrDA-compliant data exchange in mobile phones, PDAs, industrial handheld terminals, medical instrumentation, point-of-sale (POS) terminals, remote metering, and any embedded system that needs to add a low-power, cable-free, short-range serial link without the cost of an RF radio module. Designers can replace a heavier or power-hungry optical module with this compact 14-pin solution.
When designing with the MCP2120T-I/SL, ensure the UART baud rate is one of the supported IrDA rates (typically 9.6 kbaud to 115.2 kbaud, with the higher speeds selectable via the baud-rate generator). The IR transceiver's TX and RX lines must be properly biased per the transceiver datasheet because the MCP2120T-I/SL only handles the electrical-to-Infrared protocol translation.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on stock-search pages or in distributor parameter tables.
Alternativas drop-in para MCP2120T-I/SL — 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:
MCP2120-I/SL
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MCP2120T-I/SN
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
MCP2120T-I/SL Especificações
| Função | Infrared Encoder/Decoder (IrDA) |
| Protocol | IrDA Physical Layer Specification 1.3 |
| Tensão de alimentação | 2.5 V to 5.5 V |
| Maximum Data Rate | 312.5 kbaud |
| Internal Clock | 20 MHz |
| UART Interface | Standard CMOS UART (TX/RX) |
| Process Technology | CMOS, fully static |
| Temperatura de operação | -40 °C to +85 °C (Industrial) |
| Encapsulamento | 14-SOIC (0.154", 3.90 mm width) |
| Tipo de montagem | Surface Mount |
| Packaging | Tape & Reel |
| Status RoHS | Compliant |
| Lead-Free | Yes |
| ECCN | EAR99 |
| Sub-Category | Interface IC > Encoders, Decoders, Converters |
Configuração de pinos do MCP2120T-I/SL
| Pino 1 | RX — UART receive input to MCP2120 (from host) |
| Pino 2 | TX — UART transmit output to host |
| Pino 3 | NC — Not connected (per datasheet) |
| Pino 4 | GND — Ground |
| Pino 5 | RXIR — Receive IR data from optical transceiver |
| Pino 6 | TXIR — Transmit IR data to optical transceiver |
| Pino 7 | VCC — Power supply input (2.5 V to 5.5 V) |
| Pino 8 | NC — Not connected (per datasheet) |
| Pino 9 | NC — Not connected (per datasheet) |
| Pino 10 | NC — Not connected (per datasheet) |
| Pino 11 | NC — Not connected (per datasheet) |
| Pino 12 | NC — Not connected (per datasheet) |
| Pino 13 | NC — Not connected (per datasheet) |
| Pino 14 | NC — Not connected (per datasheet) |
Aplicações típicas
MCP2120T-I/SL é adequado para 7 aplicaçãos: Mobile Phone / PDA IrDA Data Exchange, Industrial Handheld Terminal Serial Link, Medical Diagnostics Equipment Interface, Point-of-Sale / Retail Terminal, Remote Metering / Utility Reader, Embedded Diagnostic / Service Port, Test and Measurement Link.
Mobile Phone / PDA IrDA Data Exchange
The MCP2120T-I/SL enables legacy IrDA-compliant optical data links between a mobile handset or PDA and another device at speeds up to 115.2 kbaud. Its 2.5 V to 5.5 V single-supply range lets it run directly from the phone's Li-ion battery or its 3.3 V regulator rail. Placed between the host MCU's UART and an external TFDS4500 / TFDU4100 transceiver, the MCP2120T-I/SL handles the 3/16-bit pulse-width modulation and 1.6 µs pulse generation required by IrDA Physical Layer 1.3 without any host intervention. Compared with a full IrDA stack controller, it cuts BOM cost and frees the host MCU from real-time bit-banging, while keeping the optical link cable-free.
Recomendado
Industrial Handheld Terminal Serial Link
Barcode scanners, inventory terminals, and ruggedized HMI handhelds in factories use the MCP2120T-I/SL to add a cable-free short-range link for firmware updates or data transfer in the -40 °C to +85 °C industrial temperature range. The CMOS, fully-static architecture means the device draws minimal standby current between bursts and tolerates noisy industrial supplies. The MCP2120T-I/SL is paired with a low-power IrDA transceiver (e.g., TFBS4711) so an isolated inspection terminal can be reprogrammed without opening the enclosure - a clear reliability benefit over wired connectors that wear out in dirty plant environments.
Recomendado
Medical Diagnostics Equipment Interface
Portable medical instruments such as glucose meters, spirometers, and patient monitors historically integrated the MCP2120T-I/SL to link to ward tablets and clinician laptops without running wires. The industrial-grade -40 °C to +85 °C temperature range supports refrigerated storage and clinical environment conditions. Because the MCP2120T-I/SL handles only the IrDA Physical Layer, patient data payloads stay under direct software control of a validated medical firmware stack - a key consideration for IEC 62304 medical-device compliance. Power is typically drawn from a single Li-coin cell via a 3.3 V LDO, where the encoder's low idle current helps extend battery life.
Recomendado
Point-of-Sale / Retail Terminal
POS terminals and electronic cash registers use the MCP2120T-I/SL as a low-cost optical interface for handheld barcode scanners and polling dongles. The SOIC-14 footprint allows direct integration on the cash-register main board, paired with a top-mounted TFDS4500 IrDA transceiver window. Up to 312.5 kbaud data rate gives sub-50 ms transaction acknowledgement times for retail scanning. Compared with Bluetooth modules of the same era, the MCP2120T-I/SL + IrDA solution is significantly cheaper and avoids RF EMC certification, an important cost win for small retailers.
Recomendado
Remote Metering / Utility Reader
Utility-meter technicians used MCP2120T-I/SL-equipped handhelds to read out consumption from IrDA-equipped water, gas, and electric meters in the field. The industrial temperature grade sustains outdoor readings in winter conditions down to -40 °C. Its UART interface lets a simple PIC16F or PIC18F MCU act as the host, keeping handheld tool BOM cost low. Engineers chose the MCP2120T-I/SL over UART-to-USB bridges because IrDA avoids open USB port issues (dust, water) at outdoor meter cabinets and draws zero standby current when no optical link is active.
Recomendado
Embedded Diagnostic / Service Port
Designers often add an optical IrDA service port to a sealed enclosure so that firmware updates, logs, and diagnostics can be pulled without breaking the IP-rated gasket. The MCP2120T-I/SL enables a through-the-window optical serial link at up to 115.2 kbaud while the host MCU keeps full control of the data stream. Industrial-grade -40 °C to +85 °C operation means it survives the same thermal envelope as the host system. This topology avoids extra connectors and headers, lowering BOM and improving field serviceability - common in PLCs, motor drives, and outdoor telemetry enclosures.
Recomendado
Test and Measurement Link
Lab and production test racks used the MCP2120T-I/SL as an isolated UART-to-IR bridge so a benchtop instrument could talk to a device under test without a galvanic ground path. Because the optical link provides full galvanic isolation, the tester's ground noise cannot corrupt measurements on the DUT. Up to 115.2 kbaud data rate is sufficient for instrument logs and software downloads. Engineers particularly valued the CMOS, fully-static design that powers up cleanly and draws well below 1 mA from a single 3.3 V rail, simplifying rack power budgets.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MCP2120T-I/SL — comparação, orientação de projeto e informações de conformidade.
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Comparação com alternativas
| Parâmetro | Este produto | MCP2120-I/SL | MCP2120T-I/SN |
|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 14-SOIC | 14-SOIC - same | 14-SOIC - same |
| Supply Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V |
| Max Data Rate | 312.5 kbaud | 312.5 kbaud | 312.5 kbaud |
| Protocol | IrDA Physical Layer 1.3 | IrDA Physical Layer 1.3 | IrDA Physical Layer 1.3 |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Packaging | Tape & Reel | Tube | Tape & Reel |
| Pin Count | 14 | 14 | 14 |
Principais diferenciais
- Pure IrDA Physical Layer encoder - host retains full stack control (vs MCP2150)
- Wide 2.5 V to 5.5 V single supply (vs MCP2120T-I/SN)
- Industrial temperature grade and CMOS-static design (vs MCP2120-I/SL (tube))
Notas de projeto
The MCP2120T-I/SL handles only the IrDA Physical Layer - it does NOT include the upper-layer IrDA IrCOMM/Lite protocol. The host MCU must implement connection management, name lookups, and data framing. Designers who need plug-and-play IrDA stack handling should evaluate the MCP2150 (different pinout - SO-18 or SSOP-20).
Place the MCP2120T-I/SL as close as possible to the IrDA optical transceiver, keeping the TXIR/RXIR traces short and parallel to avoid introducing asymmetries between the transmit and receive paths. Use a single 0.1 µF ceramic bypass capacitor on VCC (pin 7) within 3 mm of the IC. Maintain at least 1 cm of unbroken ground plane beneath the SOIC-14 footprint and avoid routing digital signals under the IR window.
Estimated: power budget for the MCP2120T-I/SL itself is typically <5 mA active and <10 µA standby from a 3.3 V supply - a negligible slice of the overall link budget. The transceiver LED current dominates total system power. Verify VCC with the chosen IrDA transceiver datasheet, because some 5 V transceivers need a regulated 5 V rail or a charge-pump bias, not just the MCP2120T-I/SL's 2.5 to 5.5 V range.
Informações de conformidade
RoHS compliant per Microchip product page. EAR99 export classification. No AEC-Q100 automotive grade in the MCP2120 family; consider Infineon TFDU8100 family for automotive IrDA if required.
