SN74AVC8T245DGVR - 8-Bit Dual-Supply Bus Transceiver | TI
N.º da peça: SN74AVC8T245DGVR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $1.2 | $1,20 |
| 10 | $1.08 | $10,80 |
| 100 | $0.95 | $95,00 |
| 500 | $0.82 | $410,00 |
| 1.000 | $0.71 | $710,00 |
| 3.000 | $0.58 | $1.740,00 |
SN74AVC8T245DGVR Visão geral
A dual-supply bus transceiver is a logic IC that bridges two voltage domains in a digital system, allowing a microcontroller or ASIC on one rail (for example 1.8 V) to communicate with peripherals or memory on another rail (for example 3.3 V). The 'dual-supply' architecture uses two independent VCC pins (VCCA and VCCB) so each side of the transceiver references its own rail. Within the broader product taxonomy, this part belongs to the level shifter / voltage translation transceiver family, which sits under interface ICs and ultimately under integrated circuits.
Key features of the SN74AVC8T245 include Ioff partial-power-down support for live insertion and hot-swap scenarios, VCC isolation that forces all I/O into high-impedance when either supply is at GND, and bus-hold circuitry on the data I/Os to eliminate the need for external pull-up or pull-down resistors. The DIR pin controls signal direction (A-to-B or B-to-A), and OE disables the outputs when high. The wide 1.2 V to 3.6 V operating range covers all common logic standards including 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, and lower-voltage CMOS.
Architecturally, the device uses TI's AVC (Advanced Very-low-voltage CMOS) process technology, which combines low static power consumption with high drive strength and fast edge rates. The integrated bus-hold cells use weak feedback transistors to retain the last driven logic state on floating lines, eliminating external bias resistors. Ioff circuitry blocks the internal parasitic diode paths when VCC is removed, so the part can be safely inserted or removed from a powered backplane.
Typical applications include level shifting between a 1.8 V host processor and 3.3 V peripherals, I2C or general-purpose GPIO expansion, SD-card or SIM-card interfaces, and translating logic between FPGAs and DDR memory rails. The wide voltage range makes it useful in industrial, consumer, and portable battery-powered designs.
When designing with this part, place a 0.1 µF decoupling capacitor on each VCC pin and route the DIR and OE pins directly to a GPIO of the controlling host. Avoid leaving either VCC pin floating; unused VCC must be tied to its corresponding rail or to GND to ensure proper high-impedance behavior.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet, helping engineers select and source the part efficiently.
Alternativas drop-in para SN74AVC8T245DGVR — 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 SN74AVC8T245DGVR (mesmo formato e footprint) — diferindo em Direction Control, Function, Number of Elements, Operating Temperature, Output Enable.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
SN74AVC8T245DGVR-Q1
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SN74AVC8T245PW
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SN74AVCH8T245PW
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SN74AXC8T245PW
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SN74AVC8T245PWR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
74AVC8T245PW
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SN74AVC8T245DGVR Classificações máximas e características elétricas
| Função | 8-bit dual-supply bus transceiver with configurable voltage translation |
| Number of Bits | 8 |
| Number of Elements | 1 |
| Tipo de saída | 3-State |
| VCCA Range | 1.2 V to 3.6 V |
| VCCB Range | 1.2 V to 3.6 V |
| Direction Control | DIR pin (A-to-B or B-to-A) |
| Output Enable | Active-low OE |
| Output Drive Strength | ±12 mA |
| Propagation Delay | 2.5 ns typical at 3.3 V |
| Ioff Support | Yes (partial-power-down safe) |
| VCC Isolation | Yes (high-Z when either VCC at GND) |
| Bus-Hold | Yes (on data I/Os) |
| Temperatura de operação | -40 C to +85 C |
| Encapsulamento | 24-pin TVSOP (DGV) |
| Tipo de montagem | Surface Mount |
| Nível MSL | 1 (unlimited) |
| Status RoHS | Compliant |
Configuração de pinos do SN74AVC8T245DGVR
| Pino 1 | DIR — Direction control (LOW = B to A, HIGH = A to B) |
| Pino 2 | A1 — Data I/O, side A |
| Pino 3 | A2 — Data I/O, side A |
| Pino 4 | A3 — Data I/O, side A |
| Pino 5 | A4 — Data I/O, side A |
| Pino 6 | A5 — Data I/O, side A |
| Pino 7 | A6 — Data I/O, side A |
| Pino 8 | A7 — Data I/O, side A |
| Pino 9 | A8 — Data I/O, side A |
| Pino 10 | GND — Ground |
| Pino 11 | B8 — Data I/O, side B |
| Pino 12 | B7 — Data I/O, side B |
| Pino 13 | B6 — Data I/O, side B |
| Pino 14 | B5 — Data I/O, side B |
| Pino 15 | B4 — Data I/O, side B |
| Pino 16 | B3 — Data I/O, side B |
| Pino 17 | B2 — Data I/O, side B |
| Pino 18 | B1 — Data I/O, side B |
| Pino 19 | OE — Output enable, active-low |
| Pino 20 | VCCB — Side-B supply voltage (1.2 V to 3.6 V) |
| Pino 21 | VCCA — Side-A supply voltage (1.2 V to 3.6 V) |
| Pino 22 | NC — Not connected (per datasheet) |
| Pino 23 | NC — Not connected (per datasheet) |
| Pino 24 | NC — Not connected (per datasheet) |
Aplicações típicas
SN74AVC8T245DGVR é adequado para 6 aplicaçãos: Microcontroller-to-Peripheral Voltage Translation, FPGA-to-DDR Memory Interface Bridging, SD Card / SIM Card Level Shifting, Industrial Sensor Aggregator Networks, Portable Consumer Battery-Powered Devices, Automotive Infotainment Bus Translation.
Microcontroller-to-Peripheral Voltage Translation
The SN74AVC8T245's 1.2 V to 3.6 V dual-rail design makes it ideal for bridging a 1.8 V Cortex-M host MCU to 3.3 V peripherals such as sensors, Bluetooth modules, or LCD drivers. Its 2.5 ns typical propagation delay at 3.3 V preserves timing margins on parallel GPIO buses, while ±12 mA drive strength supports long PCB traces without buffering. Place it directly between the MCU and the peripheral array; ensure both VCC pins are decoupled with 0.1 µF ceramics within 5 mm of the IC.
Recomendado
FPGA-to-DDR Memory Interface Bridging
FPGAs often operate at 1.5 V or 1.8 V core voltages while DDR2/DDR3 memories operate at 1.8 V or 2.5 V. The SN74AVC8T245 bridges these rails with DIR-controlled direction switching, allowing bidirectional read/write data translation through a single 8-bit bus. Its Ioff feature supports partial-power-down for hot-swap FPGA mezzanine cards, and VCC isolation guarantees high-impedance when either memory or FPGA rail is unpowered during reconfiguration.
Recomendado
SD Card / SIM Card Level Shifting
SD cards and SIM card interfaces require 1.8 V or 3.3 V signal translation between the host application processor and the removable card. The SN74AVC8T245 provides 8 channels of bidirectional translation in a 24-pin TVSOP that fits into the tight footprint of a phone or IoT device. Bus-hold eliminates the need for external pull-up resistors on SD card data lines, and Ioff protects the host when cards are hot-inserted or removed under power.
Recomendado
Industrial Sensor Aggregator Networks
Industrial 4-20 mA or digital sensor networks often mix 1.8 V digital sensors with 3.3 V PLC inputs. The SN74AVC8T245 aggregates 8 sensor lines into a single 8-bit bus routed to a PLC controller, with the wide 1.2 V to 3.6 V range accepting any mix of low-voltage sensor outputs. VCC isolation enables safe insertion into live backplanes, while the -40 C to +85 C operating range meets industrial environmental requirements.
Recomendado
Portable Consumer Battery-Powered Devices
Battery-powered wearables and IoT devices typically run from a 1.2 V to 1.5 V bucked rail, while accessories and chargers operate at 3.3 V. The SN74AVC8T245's 1.2 V minimum VCC makes it ideal for direct connection to a discharged Li-ion cell, while its 12 mA drive supports charging IC signaling at 3.3 V. The low static current and bus-hold minimize battery drain when peripherals are idle.
Recomendado
Automotive Infotainment Bus Translation
Automotive infotainment systems must translate between 1.8 V or 2.5 V application processors and 3.3 V CAN, LIN, or display backplane peripherals. The SN74AVC8T245DGVR-Q1 variant is AEC-Q100 qualified for -40 C to +125 C automotive operation, and shares the same die as the standard part for design reuse. Bus-hold prevents floating lines on unplugged connectors, and Ioff protects against back-feeding during vehicle cranking transients.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para SN74AVC8T245DGVR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | SN74AVC8T245DGVR-Q1 | SN74AVC8T245PW | SN74AVCH8T245PW | SN74AXC8T245PW | SN74AVC8T245PWR | 74AVC8T245PW |
|---|---|---|---|---|---|---|---|
| Package | TVSOP-24 (DGV) | TVSOP-24 (DGV) - same | TSSOP-24 - same pinout | TSSOP-24 - same pinout | TSSOP-24 - same pinout | TSSOP-24 - same pinout | TSSOP-24 - same pinout |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Nexperia |
| Bits / Direction | 8-bit bidirectional (DIR-controlled) | 8-bit bidirectional | 8-bit bidirectional | 8-bit bidirectional | 8-bit bidirectional | 8-bit bidirectional | 8-bit bidirectional |
| VCCA Range | 1.2 V to 3.6 V | 1.2 V to 3.6 V | 1.2 V to 3.6 V | 1.2 V to 3.6 V | 0.9 V to 3.6 V (wider) | 1.2 V to 3.6 V | 1.2 V to 3.6 V |
| VCCB Range | 1.2 V to 3.6 V | 1.2 V to 3.6 V | 1.2 V to 3.6 V | 1.2 V to 3.6 V | 0.9 V to 3.6 V (wider) | 1.2 V to 3.6 V | 1.2 V to 3.6 V |
| Output Drive | ±12 mA | ±12 mA | ±12 mA | ±12 mA | ±24 mA (higher) | ±12 mA | ±12 mA |
| Automotive Grade | No (commercial -40 to +85 C) | Yes (AEC-Q100 -40 to +125 C) | No | No | No | No | No |
| Ioff / VCC Isolation | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Principais diferenciais
- 1.2 V minimum VCC supports sub-1.8 V logic rails (vs SN74LVC8T245)
- Bus-hold eliminates external pull-up resistors (vs SN74AXC8T245)
- Ioff and VCC isolation enable live-insertion designs (vs 74AVC8T245PW (Nexperia))
Notas de projeto
Decouple both VCCA (pin 21) and VCCB (pin 20) with a 0.1 µF X7R ceramic capacitor placed within 5 mm of each pin. For designs with high-speed edge rates (>50 MHz), add a 10 µF bulk capacitor near the supply pins to handle transient current spikes. Do not leave either VCC pin floating; if a rail is unused, tie it to its referenced logic rail or to GND to guarantee high-impedance behavior via VCC isolation.
Route the DIR and OE control traces as short as possible and directly from the controlling host GPIO to minimize capacitive coupling. Keep data traces matched in length (within 5 mm) on side A and side B to preserve propagation delay symmetry. For buses above 50 MHz, consider 33 Ω series-termination resistors near the driver output to dampen reflections caused by the TVSOP-24 package lead inductance.
Never apply a signal to side A when VCCA is below 1.2 V or unpowered, as this can back-power the IC through internal ESD diodes and cause latch-up. The DIR pin must be held at a valid logic level (do not float it) or the direction is undefined and both sides may drive simultaneously. OE must be tied to GND via a 10 kΩ resistor if unused, to ensure outputs are enabled by default at power-up.
Informações de conformidade
RoHS and REACH compliant per TI product page. Not AEC-Q100 qualified - choose SN74AVC8T245DGVR-Q1 for automotive. Halogen-free per TI green-product standards.
