SN74AUC2G34 - Dual Buffer Gate 0.8-2.7V | Texas Instruments
料号： SN74AUC2G34 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.09 | $0.09 |
| 10 | $0.08 | $0.80 |
| 100 | $0.055 | $5.50 |
| 500 | $0.042 | $21.00 |
| 1,000 | $0.032 | $32.00 |
SN74AUC2G34 概述
A buffer gate is a digital logic IC that passes its input to the output without inversion while regenerating drive strength and providing signal isolation. Within the logic-IC hierarchy (buffer gate -> logic IC -> digital integrated circuit), buffers are used to drive capacitive loads, isolate buses, and restore weak or degraded signal edges in low-voltage digital systems.
Key features include sub-1-V operability, 3.6-V I/O tolerance for mixed-mode signal operation, and Ioff support for partial-power-down architectures. According to the TI datasheet (Rev. B), maximum propagation delay is 1.8 ns at 1.8 V with a +/-8-mA output drive at 1.8 V and low dynamic power consumption. NanoFree package technology in the smallest variants uses the die itself as the package.
Architecturally, the device uses advanced ultra-low-voltage CMOS technology for high noise immunity and low static current. Ioff circuitry disables outputs and blocks damaging backflow current when VCC is removed while inputs remain driven - critical for multi-rail systems with flexible power sequencing.
Typical applications include signal buffering in smartphones and tablets, clock distribution, 1.8 V to 3.3 V domain-tolerant interfacing, and bus isolation in industrial and consumer electronics.
Design tip: place a 0.1 uF decoupling capacitor close to VCC and ensure input signals never exceed the absolute maximum rating of 4.6 V.
直接替换替代料： SN74AUC2G34 ——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： SN74AUC2G34 （相同外形与封装尺寸） ——差异在于 Operating Temperature, Logic Function, Package, Supply Voltage Range.
快速对比工具——选择替代料号进行并排对比：
SN74LVC2G34DCKR
✅ 直接替换✓ 有现货
$0.08 / 个
查看数据手册 →SN74AUP1T34-Q1
✅ 直接替换✓ 有现货
$0.18 / 个
查看数据手册 →SN74LVC1G34DBVR
⚡ 相同封装 ⚠️ 规格未核验📋 参考替代料（不在目录中）
74AUC2G34,115
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
74LVC2G34GW,125
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
SN74AUC2G34 最大额定值与电气特性
| Logic Function | Dual non-inverting buffer, Y = A |
| Supply Voltage Range | 0.8 V to 2.7 V |
| Optimized VCC | 1.65 V to 1.95 V |
| I/O Tolerance | 3.6 V I/O tolerant |
| Output Drive | +/-8 mA at 1.8 V |
| Max Propagation Delay | 1.8 ns at 1.8 V |
| 特性 | Ioff partial-power-down support, sub-1-V operable |
| Number of Channels | 2 |
| Input Type | CMOS |
| 工作温度 | -40C to +85C |
| Package (DBV) | SOT-23-6 |
| Package (DCK) | SC70-6 / SOT-563 |
| 安装类型 | Surface Mount |
| Absolute Max Input Voltage | 4.6 V |
| RoHS 状态 | Compliant |
SN74AUC2G34 引脚配置
| 引脚 1 | A1 — Input 1 (buffer 1) |
| 引脚 2 | GND — Ground |
| 引脚 3 | Y1 — Output 1 (buffer 1, Y = A) |
| 引脚 4 | Y2 — Output 2 (buffer 2, Y = A) |
| 引脚 5 | VCC — Power supply, 0.8 V to 2.7 V |
| 引脚 6 | A2 — Input 2 (buffer 2) |
典型应用
SN74AUC2G34 适用于 6 应用s: Smartphone and Tablet Signal Buffering, Clock Distribution and Regeneration, Level-Tolerant Domain Interfacing, Partial-Power-Down Bus Isolation, Industrial and Consumer Logic Regeneration, Wearable and IoT Edge Devices.
Smartphone and Tablet Signal Buffering
In smartphones and tablets, the SN74AUC2G34 buffers clock and control signals between application processor, baseband, and peripheral ICs running at 1.8 V. Its 1.8 ns max propagation delay at 1.8 V preserves signal timing margins, while the 3.6 V I/O tolerance allows safe connection to 3.3 V-tolerant domains during mixed-voltage interfacing. The SC70-6 (1.45 x 1.0 mm class) footprint fits dense board layouts. Ioff support prevents back-drive of rails during partial power-down, a common condition in sleep-mode sequencing.
推荐
Clock Distribution and Regeneration
The dual buffer regenerates clock edges degraded by long traces or heavy fan-out. With +/-8 mA drive at 1.8 V and 1.8 ns max propagation delay at 1.8 V, the SN74AUC2G34 restores fast rise/fall times for 1.8 V clock trees in baseband and SoC systems. One buffer channel can service a local clock net while the second handles an auxiliary clock or enable signal, saving board space versus two single-gate packages. Place 0.1 uF decoupling at VCC to minimize clock jitter from supply noise.
推荐
Level-Tolerant Domain Interfacing
The 3.6 V I/O tolerance allows 1.8 V-powered SN74AUC2G34 inputs to safely receive 3.3 V logic signals without damage, bridging mixed-voltage domains. In systems combining 1.8 V memory with 3.3 V peripherals, the buffer accepts higher-voltage inputs while driving a clean 1.8 V output, or acts as a protective pass element between domains. According to the TI datasheet (Rev. B), inputs tolerate up to 3.6 V regardless of VCC, eliminating the need for series resistors or dedicated translators in tolerant-only cases.
推荐
Partial-Power-Down Bus Isolation
Multi-rail systems frequently power down one domain while another remains live. The Ioff feature of the SN74AUC2G34, fully specified for partial-power-down per the TI datasheet, blocks damaging backflow current when VCC is absent while inputs stay driven. This lets designers insert the buffer at domain boundaries to isolate de-powered buses from live ones, protecting downstream silicon and preventing phantom powering of de-energized rails. It removes the need for external protection diodes or power-sequencing logic.
推荐
Industrial and Consumer Logic Regeneration
In industrial control boards and consumer appliances, weak or noisy digital signals from sensors and connectors need regeneration before reaching MCUs. The SN74AUC2G34 provides two buffer channels with CMOS noise immunity and +/-8 mA drive, restoring signal integrity over the -40C to +85C industrial temperature range. Its sub-1-V operability supports low-voltage MCU rails, while the low static current keeps standby consumption negligible in always-on equipment such as meters and home-automation nodes.
推荐
Wearable and IoT Edge Devices
Wearables and battery-powered IoT nodes operate from single-cell Li-ion or coin cells with 1.8 V to 2.7 V rails - exactly the SN74AUC2G34 supply window. Sub-1-V operability keeps the device functional during brownouts as the battery discharges, and very low dynamic power consumption (AUC family) extends battery life versus HC/HCT alternatives. The SC70-6 package occupies minimal board area in tightly packed wearable PCBs, while Ioff supports aggressive power-gating of sensor subsystems.
推荐
推荐产品汇总
工程参考数据： SN74AUC2G34 ——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 | SN74LVC2G34DCKR | SN74AUP1T34-Q1 | 74AUC2G34,115 |
|---|---|---|---|---|
| Package | SOT-23-6 (DBV) / SC70-6 (DCK) | SC70-6 (DCK) | SOT-23-6 (DBV) | SOT-23-6 / SC-88 compatible |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Nexperia |
| Channels | 2 | 2 | 1 | 2 |
| Supply Voltage Range | 0.8 V to 2.7 V | 1.2 V to 3.6 V | 0.8 V to 2.7 V (translating) | 0.8 V to 2.7 V |
| I/O Tolerance | 3.6 V | 3.6 V | 3.6 V | 3.6 V |
| Ioff / Partial Power-Down | Yes | Yes | Yes | Yes |
关键差异点
- Sub-1-V operability （对比 SN74LVC2G34DCKR)
- AUC speed at 1.8 V （对比 SN74AUP1T34-Q1)
- Same dual-buffer function at 3.3 V rails （对比 74LVC2G34GW,125)
设计说明
Place a 0.1 uF ceramic decoupling capacitor within 2 mm of the VCC pin, with a solid via to the ground plane. The AUC family's sub-nanosecond edge rates inject significant dynamic current; poor decoupling manifests as ground bounce and output ringing on both buffer channels simultaneously. Keep input traces short and away from switching nodes.
Absolute maximum input voltage is 4.6 V - although the device is 3.6 V I/O tolerant, never apply 5 V logic signals directly. In partial-power-down designs, remember that Ioff protects the device but does not prevent the buffer from being back-powered through its input protection paths beyond specified limits; verify rail sequencing with the TI logic application guide.
With 1.8 ns max propagation delay, the SN74AUC2G34 output edge can drive unterminated stubs into reflections. For traces longer than roughly 1/6 of the signal rise time in propagation distance, add a series termination resistor (22-33 ohm) at the output. Match the two buffer channels' trace lengths when they carry related clock signals to preserve skew.
合规信息
RoHS compliant per TI product page. AEC-Q100 not claimed for the standard part; select the SN74AUP1T34-Q1 for automotive qualification.
