74LVC2G125DC - Dual 3-State Buffer 1.65V-5.5V | Nexperia
料号： 74LVC2G125DC ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.46 | $0.46 |
| 10 | $0.38 | $3.80 |
| 100 | $0.24 | $24.00 |
| 500 | $0.18 | $90.00 |
| 1,000 | $0.14 | $140.00 |
74LVC2G125DC 概述
A buffer IC (also called a line driver) is a digital logic component whose primary function is to isolate a signal source from its load while reproducing the input logic level at the output with no inversion. Buffers with 3-state outputs (high, low, high-impedance) allow multiple devices to share a common bus by selectively enabling or disabling the output stage. The 74LVC family belongs to the Low-Voltage CMOS logic family, characterized by low static power consumption, high noise margin, and 5 V input tolerance even when powered at lower voltages - making it ideal for mixed-voltage system designs.
Key features include ±24 mA output drive capability at VCC = 3.0 V, typical propagation delay of 2.0 ns at VCC = 3.3 V, and integrated ESD protection exceeding 2000 V HBM (JESD22-A114) and 200 V MM (JESD22-A115). Each buffer has an independent active-low output enable pin (1OE, 2OE), allowing per-channel bus control. The CMOS low-power design minimizes quiescent current draw, which is critical for battery-powered and always-on applications.
The 74LVC2G125DC utilizes Nexperia's advanced CMOS process with Schmitt-trigger inputs for improved noise immunity and slow-input transition tolerance. Output edges are well-controlled, and the symmetric output drive ensures balanced rise/fall times across operating conditions. Independent enable inputs support partial power gating, enabling selective deactivation of unused signal paths.
Typical applications include bus isolation in mixed-voltage systems, signal buffering for memory and peripheral interfaces, level translation between 5 V and 3.3 V logic domains, fan-out expansion for clock distribution, and I/O port expansion in microcontrollers. The wide operating range makes it equally suitable for portable consumer devices and industrial control systems.
When designing with this part, ensure that the 3-state enable pins are properly managed to avoid bus contention. Always deassert nOE before changing direction in bidirectional applications to prevent momentary short circuits. The VSSOP-8 package requires careful PCB layout for clean signal integrity at high data rates.
直接替换替代料： 74LVC2G125DC ——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： 74LVC2G125DC （相同外形与封装尺寸） ——差异在于 ESD Protection (HBM), Input Voltage Tolerance, MSL Level, Package.
快速对比工具——选择替代料号进行并排对比：
74LVC2G125DC,125
✅ 直接替换📋 参考替代料（不在目录中）
74LVC2G125DC-Q100H
✅ 直接替换📋 参考替代料（不在目录中）
SN74LVC2G125DCUR
✅ 直接替换✓ 有现货
$0.14 / 个
查看数据手册 →74LVC2G125DP,125
✅ 直接替换📋 参考替代料（不在目录中）
SN74LVC2G125IDCURQ1
✅ 直接替换📋 参考替代料（不在目录中）
74LVC2G125DCUTE4
✅ 直接替换📋 参考替代料（不在目录中）
74LVC2G125DC 最大额定值与电气特性
| 功能 | Buffer/Line Driver, Non-Inverting |
| Number of Channels | 2 |
| Bits per Element | 1 |
| 输出类型 | 3-State |
| Supply Voltage (VCC) | 1.65 V to 5.5 V |
| Input Voltage Tolerance | Up to 5.5 V (regardless of VCC) |
| Output Drive Current | ±24 mA at VCC = 3.0 V |
| Propagation Delay (tpd) | 2.0 ns typical at VCC = 3.3 V |
| ESD Protection (HBM) | >2000 V (JESD22-A114) |
| ESD Protection (MM) | >200 V (JESD22-A115) |
| Enable Pin Polarity | Active-Low (nOE) |
| 工作温度 | -40 °C to +125 °C |
| 封装 | VSSOP-8 (SOT765) |
| 安装类型 | Surface Mount |
| MSL 等级 | 1 (unlimited) |
| RoHS 状态 | Compliant |
| Logic Family | 74LVC (Low-Voltage CMOS) |
74LVC2G125DC 引脚配置
| 引脚 1 | 1OE — Output enable input for channel 1 (active LOW) |
| 引脚 2 | 1A — Data input for channel 1 |
| 引脚 3 | 2Y — Data output for channel 2 |
| 引脚 4 | GND — Ground (0 V) |
| 引脚 5 | 1Y — Data output for channel 1 |
| 引脚 6 | 2A — Data input for channel 2 |
| 引脚 7 | 2OE — Output enable input for channel 2 (active LOW) |
| 引脚 8 | VCC — Supply voltage (1.65 V to 5.5 V) |
典型应用
74LVC2G125DC 适用于 6 应用s: Mixed-Voltage Bus Isolation, Clock Distribution Fan-Out, I/O Port Expansion for MCUs, Memory Bus Buffering, Bidirectional Bus Direction Control, LED and Indicator Driving.
Mixed-Voltage Bus Isolation
The 74LVC2G125DC is well-suited for isolating signals between 5 V and 3.3 V logic domains in mixed-voltage systems. Its 5 V-tolerant inputs accept signals from 5 V CMOS or TTL devices even when VCC is powered at 1.8 V or 3.3 V, eliminating the need for dedicated level-shifter ICs. With ±24 mA drive capability, the buffer can source or sink current into downstream logic without additional amplification, and the 2.0 ns propagation delay preserves timing margins for high-speed bus transactions. Designers typically place one 74LVC2G125DC near each voltage domain boundary, using the active-low enable to tri-state the buffer when the bus is owned by another master. The VSSOP-8 footprint saves board area versus traditional SOIC-14 dual-buffer alternatives.
推荐
Clock Distribution Fan-Out
Clock distribution networks benefit from the 74LVC2G125DC's low 2.0 ns propagation delay and high ±24 mA output drive, allowing a single clock source to fan out to multiple loads with minimal skew and signal degradation. Each buffer channel provides isolation between the source and downstream clock receivers, preventing reflections and load-induced jitter from propagating back into the master oscillator. The 3-state enable pins allow gated clock control for power-saving modes in always-on systems. Designers route one buffer output to a microcontroller, another to a memory controller, and gate unused outputs to high-Z during sleep states. The wide 1.65-5.5 V VCC range means the same part serves 1.8 V, 2.5 V, 3.3 V, and 5 V clock domains across product variants.
推荐
I/O Port Expansion for MCUs
Microcontroller designs often need additional GPIO or bus pins beyond what the silicon provides. The 74LVC2G125DC adds two non-inverting 3-state output channels that an MCU can control through its native GPIO pins, expanding effective I/O count without migrating to a larger package MCU. The buffer's ±24 mA drive capability directly drives LEDs, relays, and other peripherals that exceed MCU pin drive limits, protecting the MCU from back-EMF and overcurrent events. With 1.65 V VCC operation, the part works seamlessly with 1.8 V core MCUs while still accepting 5 V signals. Industrial control panels and human-machine interface (HMI) modules use this pattern to add isolated outputs while maintaining firmware simplicity.
推荐
Memory Bus Buffering
Memory interfaces such as SPI flash and parallel SRAM benefit from the 74LVC2G125DC's signal buffering to isolate the memory bus from the controller. Long PCB traces between the MCU and memory chips introduce capacitive loading and reflections that degrade signal integrity; placing a 74LVC2G125DC near the memory provides a clean, low-impedance drive source. The buffer's 3-state output allows the memory bus to be shared with other peripherals by tri-stating when those peripherals own the bus. With sub-3 ns propagation delay, timing closure is maintained even at SPI clock rates up to 100 MHz. The 5 V input tolerance also enables legacy 5 V memory devices to communicate with modern 3.3 V controllers through this buffer.
推荐
Bidirectional Bus Direction Control
Although the 74LVC2G125DC is a unidirectional buffer, two channels can be paired to form a controlled bidirectional bus interface. By cross-coupling the output enable pins and data lines, designers create a direction-controlled transceiver using two buffer ICs in a master-slave configuration. This approach is common in low-cost point-to-point links, sensor interfaces, and industrial fieldbus segments where a full transceiver IC would be overkill. Each direction has independent enable control, allowing half-duplex communication with proper arbitration. The 1.65 V to 5.5 V VCC range supports both battery-powered sensor nodes (1.8 V) and industrial controllers (3.3 V or 5 V).
推荐
LED and Indicator Driving
The 74LVC2G125DC's ±24 mA output drive is sufficient to directly sink or source current for low-current LEDs, indicator lamps, and optocoupler inputs without external driver transistors. By buffering the MCU output through the 74LVC2G125DC, the MCU pin is protected from back-EMF and overcurrent conditions that could otherwise damage silicon. Two channels enable status indication (e.g., power and fault) from a single buffer IC, reducing board space versus discrete driver designs. The 3.3 V or 5 V VCC options match typical industrial panel supply rails. Designers also use this buffer to drive optocouplers in isolated interfaces, where the buffer maintains signal integrity across the galvanic barrier.
推荐
推荐产品汇总
工程参考数据： 74LVC2G125DC ——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 | 74LVC2G125DC,125 | 74LVC2G125DC-Q100H | SN74LVC2G125DCUR | SN74LVC2G125IDCURQ1 |
|---|---|---|---|---|---|
| Package | VSSOP-8 (SOT765) | VSSOP-8 (SOT765) - same | VSSOP-8 (SOT765) - same | VSSOP-8 (DCU) - same footprint | VSSOP-8 (DCU) - same footprint |
| Brand | Nexperia | Nexperia | Nexperia | Texas Instruments | Texas Instruments |
| Supply Voltage Range | 1.65 V to 5.5 V | 1.65 V to 5.5 V | 1.65 V to 5.5 V | 1.65 V to 5.5 V | 1.65 V to 5.5 V |
| Output Drive (±mA) | ±24 mA at VCC=3.0V | ±24 mA | ±24 mA | ±24 mA | ±24 mA |
| Propagation Delay | 2.0 ns typical | 2.0 ns | 2.0 ns | 2.0 ns | 2.0 ns |
| Automotive Grade (AEC-Q100) | No | No | Yes (AEC-Q100) | No | Yes (AEC-Q100) |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
| Logic Function | Non-inverting buffer | Non-inverting buffer | Non-inverting buffer | Non-inverting buffer | Non-inverting buffer |
关键差异点
- Wide VCC range with 5V-tolerant inputs （对比 Standard 74HC244 (SOIC-20))
- Dual independent 3-state enables （对比 Single-buffer 74LVC1G125GW)
- High ±24 mA output drive in tiny package （对比 74LVC1G04GW inverter)
设计说明
Never leave the nOE pins floating - they will float to a mid-rail voltage that can cause the output stage to draw excessive shoot-through current and oscillate. Always tie unused nOE pins directly to GND (logic low) to keep the buffer enabled, or to VCC if you want the output in high-Z. A 100 kΩ pull-down or pull-up resistor provides safety against floating during MCU reset or power-ramp conditions. Floating enable inputs are a common cause of unexplained current consumption in mixed-signal designs.
The VSSOP-8 (SOT765) package has a 0.5 mm lead pitch, requiring precise PCB land pattern design per the Nexperia package drawing. Keep VCC and GND traces short and place a 100 nF decoupling capacitor within 3 mm of the VCC pin to suppress supply noise. For high-speed signals (>50 MHz), use controlled-impedance traces and minimize stub lengths. A ground plane on the layer directly beneath the IC improves thermal dissipation and reduces EMI.
When driving long PCB traces (>50 mm) or heavy capacitive loads (>50 pF), add a series damping resistor (22-33 Ω) close to the buffer output to limit ringing and overshoot. The 74LVC2G125DC's ±24 mA drive can otherwise cause reflections on improperly terminated traces. For bus-sharing applications, ensure only one buffer's nOE is asserted at any time to prevent bus contention. Verify timing margins with the actual load capacitance rather than relying on datasheet typical values at 15 pF.
合规信息
RoHS and REACH compliant per Nexperia product page. Standard grade is not AEC-Q100 qualified - select 74LVC2G125DC-Q100H for automotive applications. JEDEC JESD22-A114 (HBM) and JESD22-A115 (MM) ESD ratings exceed industry standards.
