SN74AVC4T245PWR - 4-Bit Dual-Supply Level Shifter | TI
料号： SN74AVC4T245PWR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.78 | $0.78 |
| 10 | $0.7 | $7.00 |
| 100 | $0.55 | $55.00 |
| 500 | $0.46 | $230.00 |
| 1,000 | $0.38 | $380.00 |
SN74AVC4T245PWR 概述
A bus transceiver is a digital integrated circuit that transfers data bidirectionally between two buses, using direction-control and output-enable inputs plus 3-state outputs so multiple devices can share a common bus. The SN74AVC4T245 belongs to the voltage translator (level shifter) family within the broader logic IC and interface IC hierarchy, and it is essential in mixed-voltage systems where MCUs, FPGAs, sensors, and memory operate at different logic levels.
Key features include configurable voltage translation on both ports, control inputs (1DIR, 2DIR, 1OE, 2OE) referenced to VCCA for simplified control logic, and Ioff partial-power-down circuitry that disables outputs and prevents damaging backflow current when either rail is at GND. A VCC isolation feature places all I/O in high-impedance if either supply is absent.
Technically, the device supports asynchronous communication between two data buses at data rates up to 380 Mbps with a typical propagation delay around 2.5 ns, suiting high-speed SPI, parallel bus, and GPIO interfaces. The TSSOP-16 package has a 4.4mm body width and 0.65mm pin pitch for space-constrained PCBs.
Typical applications include level shifting for SPI, UART, I2C-adjacent GPIO expansion, and FPGA or ASIC interconnects in industrial control, portable battery-powered electronics, and automotive modules where multiple voltage domains coexist.
Design tip: keep the DIR and OE pins driven from VCCA-domain logic and place 0.1uF decoupling capacitors close to both VCCA and VCCB pins; avoid bus contention by sequencing direction changes with a brief high-impedance interval.
直接替换替代料： SN74AVC4T245PWR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： SN74AVC4T245PWR （相同外形与封装尺寸） ——差异在于 Output Type, Package.
快速对比工具——选择替代料号进行并排对比：
SN74AVCH4T245PWR
✅ 直接替换📋 参考替代料（不在目录中）
SN74AVC4T245PWR
✅ 直接替换✓ 有现货
$0.38 / 个
查看数据手册 →SN74LVC4T245PWR
✅ 直接替换📋 参考替代料（不在目录中）
74AVC4T245PW,112
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
SN74AVC4T245PWT
✅ 直接替换📋 参考替代料（不在目录中）
SN74AVC4T245PWR 最大额定值与电气特性
| 功能 | 4-bit dual-supply bus transceiver with configurable voltage translation |
| Supply Voltage VCCA | 0.8 V to 3.6 V |
| Supply Voltage VCCB | 0.8 V to 3.6 V |
| Translation Direction | Bidirectional, any VCCA/VCCB combination |
| Max Data Rate | 380 Mbps |
| 输出类型 | 3-State |
| Control Inputs | 1DIR, 2DIR, 1OE, 2OE (referenced to VCCA) |
| Ioff Partial Power Down | Yes |
| VCC Isolation | Yes - I/O high impedance if either rail at GND |
| 封装 | 16-TSSOP (PW), 4.4 mm body, 0.65 mm pitch |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Packaging | Tape & Reel (PWR suffix) |
SN74AVC4T245PWR 引脚配置
| 引脚 1 | 1OE — Output enable 1 (active low, referenced to VCCA) |
| 引脚 2 | 1DIR — Direction control port 1 (referenced to VCCA) |
| 引脚 3 | A1 — Port A data 1 |
| 引脚 4 | A2 — Port A data 2 |
| 引脚 5 | VCCA — A-side supply, 0.8V to 3.6V |
| 引脚 6 | A3 — Port A data 3 |
| 引脚 7 | A4 — Port A data 4 |
| 引脚 8 | GND — Ground |
| 引脚 9 | B4 — Port B data 4 |
| 引脚 10 | B3 — Port B data 3 |
| 引脚 11 | B2 — Port B data 2 |
| 引脚 12 | B1 — Port B data 1 |
| 引脚 13 | VCCB — B-side supply, 0.8V to 3.6V |
| 引脚 14 | 2DIR — Direction control port 2 (referenced to VCCA) |
| 引脚 15 | 2OE — Output enable 2 (active low, referenced to VCCA) |
典型应用
SN74AVC4T245PWR 适用于 6 应用s: SPI Level Shifting (3.3V MCU to 1.8V Peripheral), FPGA / ASIC Mixed-Voltage I/O Interconnect, Automotive ECU Voltage Domain Bridging, Portable Battery-Powered Electronics, Industrial PLC and Control Module Interfaces, UART and GPIO Expansion Between Logic Domains.
SPI Level Shifting (3.3V MCU to 1.8V Peripheral)
The SN74AVC4T245PWR translates SPI signals between a 3.3V MCU and 1.8V flash, sensor, or display devices using VCCA=3.3V and VCCB=1.8V. Its 380 Mbps data rate comfortably supports SPI clocks of 50 MHz or more, and the 3-state outputs let one DIR pin per port steer MOSI (A-to-B) and MISO (B-to-A) independently. Place 0.1uF decoupling at both VCCA and VCCB; the Ioff feature prevents backfeed when the 1.8V rail is powered down.
推荐
FPGA / ASIC Mixed-Voltage I/O Interconnect
In FPGA systems, bank voltages often differ from ASIC or backplane logic levels. The SN74AVC4T245PWR bridges a 2.5V or 3.3V bank to a 1.2V/1.5V ASIC domain, with the VCC isolation feature forcing all I/O high-impedance if either rail collapses, protecting the fragile low-voltage die. The 380 Mbps rate and ~2.5 ns typical delay preserve timing margins on parallel configuration or data buses in industrial and communications equipment.
推荐
Automotive ECU Voltage Domain Bridging
Automotive ECUs combine 3.3V microcontrollers with 1.8V safety MCUs and sensors. The pin-compatible, AEC-Q100 qualified SN74AVC4T245QPWRQ1 shares this footprint, so boards designed around the standard AVC4T245 can migrate to automotive grade without layout changes. Control pins referenced to VCCA simplify interfacing with the primary 3.3V domain, while Ioff circuitry safely isolates I/O during partial-power-down crank conditions.
推荐
Portable Battery-Powered Electronics
In battery products, a boost converter may supply 3.3V while a power-frugal PMIC rail runs at 1.2V or 1.8V. The SN74AVC4T245PWR's 0.8V minimum VCC accommodates aggressively scaled low-voltage domains, and its Ioff plus VCC isolation features prevent leakage back into unpowered rails, extending battery life. The 4.4mm-wide TSSOP-16 keeps the footprint small for wearables and handheld instrument GPIO expansion.
推荐
Industrial PLC and Control Module Interfaces
Industrial controllers mix 3.3V logic with 5V-tolerant or 2.5V field-side signaling. The SN74AVC4T245PWR buffers parallel status and command buses between domains with 3-state outputs that allow multiple cards to share a backplane bus via the OE pins. Direction changes sequenced through DIR with a high-impedance interval prevent contention. Its robust dual-rail design tolerates supply sequencing in either order, simplifying hot-swap slot design.
推荐
UART and GPIO Expansion Between Logic Domains
For UART, I2C-adjacent GPIO, and general-purpose control signaling between a 1.8V SoC and 3.3V peripherals, the SN74AVC4T245PWR provides four buffered bidirectional channels. Configurable translation means no pull-up resistor schemes (unlike TXS-family passive translators), giving clean, fast edges at high data rates. Tying OE low for always-on GPIO or gating it for power savings offers design flexibility in networking modules and IoT gateways.
推荐
推荐产品汇总
工程参考数据： SN74AVC4T245PWR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | SN74AVCH4T245PWR | SN74AVC4T245QPWRQ1 | SN74LVC4T245PWR | 74AVC4T245PW,112 |
|---|---|---|---|---|---|
| Package | 16-TSSOP (PW) | 16-TSSOP (PW) - same | 16-TSSOP (PW) - same | 16-TSSOP (PW) - same | 16-TSSOP (PW) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | NXP (Nexperia) |
| Supply Voltage Range | 0.8V to 3.6V (both rails) | 0.8V to 3.6V | 0.8V to 3.6V | 1.65V to 3.6V | 0.8V to 3.6V |
| Bit Width | 4-bit | 4-bit | 4-bit | 4-bit | 4-bit |
| Bus Hold Inputs | No | Yes | No | No | No |
| Ioff Partial Power Down | Yes | Yes | Yes | Yes | Yes |
| Automotive Grade | No | No | Yes (AEC-Q100) | No | No |
| 5V Tolerant I/O | No | No | No | Yes | No |
关键差异点
- True sub-1V support on both ports （对比 SN74LVC4T245PWR)
- Automotive-grade drop-in option （对比 SN74AVC4T245QPWRQ1)
- Bus-hold variant available （对比 SN74AVCH4T245PWR)
- Active-drive translation vs passive schemes （对比 TXB0104QRUTRQ1)
设计说明
Place 0.1uF ceramic decoupling capacitors within 2 mm of both VCCA and VCCB pins, each with a low-impedance ground return. The AVC family switches fast (380 Mbps class), so supply inductance directly translates to ground bounce and ringback on data lines. A solid ground plane under the TSSOP-16 and short (under 10 mm) traces to the translated bus keep signal integrity within the 2.5 ns typical propagation-delay budget.
Control inputs 1DIR, 2DIR, 1OE, and 2OE are referenced to VCCA per the TI datasheet - drive them from VCCA-domain logic only, or use a small-signal translator if the controller lives on the VCCB domain. When reversing bus direction, disable outputs (OE high) for at least one bus turnaround interval before toggling DIR to avoid momentary bus contention and crowbar current between opposing drivers.
The device powers up safely in either rail order thanks to the VCC isolation feature, but decouple each rail independently and do not share a single decoupling network between VCCA and VCCB - the whole point of dual rails is domain isolation. For partial-power-down systems, the Ioff circuitry blocks backflow current, so no external isolation diodes are needed when one domain is unpowered.
Do not exceed 3.6V on either VCCA or VCCB - this family is not 5V tolerant on supplies or I/O; use SN74LVC4T245PWR instead if 5V tolerance is required. Also note the standard AVC4T245 lacks bus-hold: floating A or B inputs after power-up can oscillate; select SN74AVCH4T245PWR if bus-hold is needed, or drive all inputs valid.
合规信息
RoHS compliant per TI product page and distributor listings. Automotive version (SN74AVC4T245QPWRQ1) is available separately; the standard PWR is not AEC-Q100 qualified.
