TCA9617BDGKR - 1MHz FM+ I2C Bus Repeater, VSSOP-8 | Texas Instruments
N.º da peça: TCA9617BDGKR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $1.42 | $1,42 |
| 10 | $1.21 | $12,10 |
| 100 | $0.95 | $95,00 |
| 500 | $0.78 | $390,00 |
| 1.000 | $0.66 | $660,00 |
| 2.500 | $0.55 | $1.375,00 |
TCA9617BDGKR Visão geral
An I2C bus repeater is a specialized bus interface device that electrically isolates two physical I2C segments while still allowing them to behave as one logical bus. By buffering the SCL and SDA lines, a repeater overcomes the classic I2C limitation of bus capacitance: each segment of the bus is loaded independently, so engineers can attach far more devices, run longer PCB traces, or use longer cables than would otherwise be possible. The TCA9617B also performs voltage level translation (also called a level shifter), so the same repeater allows a low-voltage MCU to talk to a 5 V sensor without dedicated glue logic.
Key specifications of the TCA9617BDGKR include: 1 MHz maximum clock frequency, support for 0.8 V to 5.5 V on the A-side, 2.2 V to 5.5 V on the B-side, EN (enable) input with powered-off high-impedance behavior, low standby current (VCCA suspend), and integrated pull-up current sources that eliminate the need for external bus pull-ups on the B-side. The BiCMOS internal design provides clean edges and controlled rise/fall times even at full Fm+ speed. The device is offered in three temperature grades with -40 °C to +85 °C as the commercial grade.
Typical applications include I2C bus extension between boards, voltage translation between low-voltage MCUs and 3.3 V/5 V peripherals, server backplanes, telecommunications equipment, and any system where the total bus capacitance exceeds the 400 pF Fast-mode or 550 pF Fast-mode Plus limit imposed by the I2C specification. The repeater transparently regenerates SCL and SDA so that slaves on either side see a clean, well-formed waveform.
When designing with the TCA9617B, observe that the A-side and B-side each require their own pull-up resistors; the B-side pull-ups must be to VCCB and the A-side pull-ups must be to VCCA. Avoid enabling the device with EN high before both VCCA and VCCB rails have ramped. Series resistance on the bus should be kept low to preserve Fm+ rise-time margins.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing a single reference for engineers selecting an I2C repeater/level shifter for mixed-voltage systems.
Alternativas drop-in para TCA9617BDGKR — 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:
TCA9617ADGKR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TCA9617BDGKT
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PCA9617ADPJ
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTC4311CSC6
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX3378EEUD
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TCA9617BDGKR Especificações
| Função | Bidirectional I2C/SMBus buffer and level translator (repeater) |
| Number of Channels | 2 (SCL, SDA) |
| Bidirectional Channels | 1 circuit / 2 channels |
| Frequência máxima de clock | 1 MHz (Fast-mode Plus / Fm+) |
| A-side Voltage Range (VCCA) | 0.8 V to 5.5 V |
| B-side Voltage Range (VCCB) | 2.2 V to 5.5 V |
| Translation Type | Bidirectional up- and down-translation |
| Bus Compatibility | I2C Standard-mode, Fast-mode, Fast-mode Plus; SMBus |
| Enable Pin (EN) | Yes - active high; pulled-down after power-up; powered-off high-impedance behavior |
| Powered-off Behavior | High-impedance on all I/Os when VCCB = 0 V |
| Process Technology | BiCMOS |
| Encapsulamento | 8-VSSOP / 8-MSOP (DGK), 3.00 mm body width |
| Tipo de montagem | Surface Mount |
| Faixa de temperatura de operação | -40 °C to +85 °C |
| Status RoHS | Compliant |
| MSL (Moisture Sensitivity Level) | Level-1, 260 °C unlimited (per PartGenie listing) |
Configuração de pinos do TCA9617BDGKR
| Pino 1 | NC — Not connected (per datasheet) |
| Pino 2 | VCCA — Low-voltage A-side supply (0.8 V to 5.5 V) |
| Pino 3 | SCLA — I2C serial clock, A-side |
| Pino 4 | SDAA — I2C serial data, A-side |
| Pino 5 | GND — Common ground reference |
| Pino 6 | SCLB — I2C serial clock, B-side |
| Pino 7 | SDAB — I2C serial data, B-side |
| Pino 8 | VCCB — High-voltage B-side supply (2.2 V to 5.5 V) |
Aplicações típicas
TCA9617BDGKR é adequado para 6 aplicaçãos: Mixed-Voltage I2C Bus Translator, I2C Bus Extension and Capacitance Buffer, Server and Telecom Backplane I2C, Industrial Sensor Aggregation Node, Portable / Wearable Mixed-Voltage Sensor Hub, Test & Measurement Instrumentation.
Mixed-Voltage I2C Bus Translator
The TCA9617BDGKR bridges a low-voltage MCU (1.0 V to 1.8 V) to a higher-voltage I2C peripheral (3.3 V or 5 V) on the same physical bus. Its 0.8 V to 5.5 V VCCA range matches modern low-voltage processors, while the 2.2 V to 5.5 V VCCB range accommodates legacy peripherals. The BiCMOS buffer provides clean edges at 1 MHz Fm+, so audio codecs, sensors, and EEPROMs downstream of the translator receive correctly formed SCL/SDA waveforms without dedicated glue logic.
Recomendado
I2C Bus Extension and Capacitance Buffer
Long PCB traces, multiple daughtercards, or large cable runs can push total bus capacitance past the I2C-specified 400 pF (Fast-mode) or 550 pF (Fast-mode Plus) limit. The TCA9617BDGKR electrically splits the bus into two segments with independent capacitance budgets, so each side can carry up to 550 pF at Fm+. Designers can therefore attach more devices, route longer traces, or use ribbon cables between boards without violating the I2C rise-time requirement, while retaining 1 MHz Fm+ clocking on both sides.
Recomendado
Server and Telecom Backplane I2C
Servers, routers, and telecom baseband cards rely on I2C/SMBus for PSUs, EEPROMs, and management controllers spread across backplanes with high capacitive loading. The TCA9617BDGKR's 1 MHz Fm+ support, powered-off high-impedance behavior, and BiCMOS drive strength make it suitable for hot-swappable backplane segments where intermediate cards can be inserted or removed without disturbing the upstream bus. Placed at each card boundary, the repeater isolates hot-plug events and maintains SMBus signal integrity across the chassis.
Recomendado
Industrial Sensor Aggregation Node
Industrial sensor nodes typically aggregate multiple I2C sensors (temperature, humidity, accelerometers) on a single bus that may run several meters. The TCA9617BDGKR buffers the upstream MCU's local I2C segment from a long downstream cable so the MCU sees a clean, low-capacitance bus while the cable-side segment can host many more sensors. The VSSOP-8 package and -40 °C to +85 °C industrial temperature grade suit compact industrial enclosures and harsh factory environments.
Recomendado
Portable / Wearable Mixed-Voltage Sensor Hub
Wearable platforms often pair a 1.2 V or 1.8 V application processor with 3.3 V sensors and actuators (haptics, LED drivers, fuel gauges). The TCA9617BDGKR translates the application processor's I2C bus to the higher-voltage peripherals without sacrificing Fm+ performance, with low quiescent current to preserve battery life. Its powered-off high-impedance I/Os allow the sensor rail to be shut down completely while the application processor remains active, supporting aggressive power-gating strategies.
Recomendado
Test & Measurement Instrumentation
Lab instruments frequently combine a low-voltage DSP/FPGA evaluation card with a 5 V analog sensor frontend or display module. The TCA9617BDGKR cleanly buffers the digital bus from the analog domain, supporting bidirectional traffic at up to 1 MHz Fm+ for fast configuration updates and data streaming. The wide VCCA range (down to 0.8 V) accommodates modern low-voltage FPGA/MCU cores while VCCB tolerates 5 V instrumentation rails.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para TCA9617BDGKR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | TCA9617ADGKR | TCA9617BDGKT | PCA9617ADPJ | LTC4311CSC6 | MAX3378EEUD |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | NXP Semiconductors | Analog Devices | Analog Devices |
| Package | 8-VSSOP (DGK) | 8-VSSOP (DGK) - same | 8-VSSOP (DGK) - same | 8-TSSOP (MSOP-equivalent) - same | 8-MSOP - same | 8-MSOP - same |
| Max Clock Frequency | 1 MHz (Fm+) | 1 MHz | 1 MHz | 1 MHz | 1 MHz (with accelerator) | 400 kHz (Fast-mode) |
| Number of Channels | 2 (SCL, SDA) | 2 (SCL, SDA) | 2 (SCL, SDA) | 2 (SCL, SDA) | 2 (SCL, SDA) | 4 |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Approx. Unit Price (qty 1) | $1.42 | $1.20-$1.40 | $1.42 | $1.50-$1.80 | $2.20-$2.80 | $1.80-$2.20 |
Principais diferenciais
- Newer production-recommended B-revision with broader distributor stock (vs TCA9617ADGKR (A-revision))
- Wide VCCA range down to 0.8 V for modern low-voltage MCUs (vs MAX3378EEUD)
- Powered-off high-impedance I/Os for hot-swap safety (vs LTC4311CSC6)
Notas de projeto
Apply VCCA and VCCB in any sequence. The device enters a high-impedance condition on all I/Os when VCCB = 0 V, allowing the B-side bus to remain connected to other devices during power-up of the A-side. Do not drive SCLA/SDAA or SCLB/SDAB from external controllers during the supply ramp; allow at least 50 microseconds of settling time after VCCB reaches 2.2 V before issuing I2C transactions to ensure the internal bandgap and current sources are stable.
Place external pull-up resistors on each side of the bus within 5 mm of the TCA9617BDGKR pins. A-side pull-ups connect to VCCA; B-side pull-ups connect to VCCB. Use the standard I2C rise-time equation (rise time = 0.8473 x R_pullup x C_bus) to size resistors for 1 MHz Fm+ operation: typically 1 kΩ to 4.7 kΩ with 100 pF bus capacitance. Keep the A-side and B-side bus segments physically short (less than 25 mm) and well-isolated to avoid crosstalk on fast edges.
Do not exceed VCCB = 5.5 V absolute maximum or VCCA = 5.5 V absolute maximum; transient overshoot above 6 V can permanently damage the part. Avoid pulling SCL/SDA below ground or above their respective VCC rails by more than 0.3 V during fault conditions. Do not insert the TCA9617BDGKR between two buses operating at incompatible logic levels without verifying that VCCA >= 0.8 V (A-side cannot be left undriven below this). If a hot-swap event is required on the B-side, add TVS protection on the bus.
Informações de conformidade
RoHS compliant and lead-free per Texas Instruments product page (https://www.ti.com/product/TCA9617B). REACH compliance status was not directly listed in the Verified Web Data and is marked unknown. AEC-Q100 is not applicable (commercial/industrial temperature grade only).
