SN74LVC2G34DCKR - Dual Buffer 1.65-5.5V SC-70-6 | Texas Instruments
MPN： SN74LVC2G34DCKR ✓ 啟用中SN74LVC2G34DCKR 概覽
A buffer gate is a digital logic circuit that amplifies or isolates a signal without changing its logic level. In the logic IC hierarchy, it falls under gates within the 74LVC CMOS logic family, ultimately classified as a standard logic integrated circuit. Buffers increase fan-out, drive longer PCB traces, and provide impedance isolation between a signal source and its load.
Key features include support for 5-V VCC operation, inputs tolerant up to 5.5 V regardless of supply, and a typical propagation delay (tpd) of 3.3 ns at VCC = 3.3 V. Output drive is +/-24 mA at 3.3 V, ensuring solid signal integrity. Maximum ICC is only 10 uA, making the part ideal for battery-powered designs. The device is fully specified for partial-power-down applications using Ioff circuitry, which disables outputs to prevent damaging backflow current when VCC is removed.
The SN74LVC2G34 uses a CMOS process delivering high noise immunity and low static power dissipation. Typical VOLP (output ground bounce) and VOHV (undershoot) performance keeps switching noise minimal in mixed-signal boards. NanoStar and NanoFree package technologies are available in the family for ultra-miniature footprints.
Typical applications include MCU GPIO buffering, clock distribution, level-compatible interfacing between 3.3-V and 5-V domains, and general logic isolation in consumer, industrial, and communication equipment. Pair it with TI translation parts such as TXS0102-Q1 or SN74LVC1T45 for full level shifting.
Design tip: decouple VCC with a 0.1-uF ceramic capacitor close to the pin, and keep buffered traces short and impedance-controlled to preserve the 3.3-ns speed advantage.
直接替換替代品，適用於 SN74LVC2G34DCKR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： SN74LVC2G34DCKR （相同外形與佔位） — 差異在於 Logic Function, Operating Temperature, Supply Voltage Range.
SN74LVC2G34DCKR-Q1
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
SN74AUP2G34DCKR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
74LVC2G34GW,125
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
74AUP2G34GW,125
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
SN74LVC2G34DCKR 最大額定值與電氣特性
| Logic Function | Dual Non-Inverting Buffer (Y = A) |
| Logic Family | 74LVC (Low-Voltage CMOS) |
| Supply Voltage Range | 1.65 V to 5.5 V |
| Input Voltage Tolerance | 5.5 V max (independent of VCC) |
| Propagation Delay (tpd) | 3.3 ns typ at 3.3 V |
| Output Drive Current | +/-24 mA at 3.3 V |
| Maximum ICC | 10 uA |
| Ioff (Partial Power Down) | Supported |
| 輸出類型 | Push-Pull |
| Number of Elements | 2 elements, 1 bit per element |
| 工作溫度 | -40C to +125C |
| 封裝 | SC-70-6 (DCK), 2.0 mm x 1.25 mm |
| Pin Pitch | 0.65 mm |
| 安裝類型 | Surface Mount |
| ESD Protection | Exceeds 2000 V HBM (MIL-STD-883 Method 3015) |
| RoHS 狀態 | Compliant |
SN74LVC2G34DCKR 腳位配置
| 腳位 1 | 1A — Input of buffer channel 1 |
| 腳位 2 | GND — Ground |
| 腳位 3 | 2Y — Output of buffer channel 2 |
| 腳位 4 | 2A — Input of buffer channel 2 |
| 腳位 5 | 1Y — Output of buffer channel 1 |
| 腳位 6 | VCC — Power supply, 1.65 V to 5.5 V |
典型應用
SN74LVC2G34DCKR 適用於 6 應用s: MCU GPIO Buffering, Clock Distribution, Industrial Automation I/O, Battery-Powered Portable Devices, Automotive Body Electronics, Logic Isolation in Communication Equipment.
MCU GPIO Buffering
The SN74LVC2G34DCKR provides two independent Y = A buffers that increase GPIO fan-out and isolate microcontroller pins from capacitive loads. With +/-24-mA drive at 3.3 V, one buffer channel can drive multiple LEDs, optocouplers, or long traces that an MCU pin alone cannot. The 3.3-ns typical propagation delay adds negligible timing overhead to SPI or parallel buses. Its 2.0 mm x 1.25 mm SC-70-6 package fits directly adjacent to connector headers.
推薦
Clock Distribution
With a 3.3-ns typical propagation delay and low skew between the two channels, the SN74LVC2G34DCKR duplicates a clock source for two loads while regaining full logic swing. The push-pull output with defined VOLP/VOHV behavior minimizes ground bounce, keeping clock jitter low in mixed-signal boards. Place the buffer close to the clock source and decouple VCC with 0.1 uF to preserve edge rates.
推薦
Industrial Automation I/O
In industrial controllers, the SN74LVC2G34DCKR buffers status signals between PLDs, MCUs, and isolation barriers. The -40C to +125C operating range and over 2000-V HBM ESD protection (MIL-STD-883 Method 3015) withstand harsh cabinet environments, while Ioff circuitry safely disables outputs during partial power-down of subsystem rails. The automotive-qualified SN74LVC2G34DCKR-Q1 extends this into relays and actuators requiring AEC-Q100 parts.
推薦
Battery-Powered Portable Devices
A maximum ICC of only 10 uA and CMOS static operation make the SN74LVC2G34DCKR ideal for battery products where every microamp counts. The small SC-70-6 footprint conserves PCB area in wearables and handhelds. When the main rail is switched off, Ioff prevents backflow through the outputs, allowing peripherals to remain powered without draining the battery through the buffer.
推薦
Automotive Body Electronics
For automotive modules such as lighting control and door electronics, the SN74LVC2G34DCKR-Q1 variant offers AEC-Q100 qualification in the identical SC-70-6 footprint. It buffers switch inputs and drive-enable signals between 3.3-V MCUs and higher-voltage subsystems, tolerating load-dump-adjacent transients through robust ESD protection. Designers benefit from footprint commonality when migrating consumer prototypes to qualified automotive production.
推薦
Logic Isolation in Communication Equipment
Networking and telecom line cards use the SN74LVC2G34DCKR to isolate enable and reset signals between control planes and data-path ICs. Input tolerance to 5.5 V regardless of VCC allows mixing 3.3-V and 5-V logic domains without extra translators. The low ground bounce (VOLP) of the LVC family prevents crosstalk into adjacent high-speed serial lines on dense boards.
推薦
推薦產品摘要
工程參考資料，適用於 SN74LVC2G34DCKR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | SN74LVC2G34DCKR-Q1 | SN74AUP2G34DCKR | 74LVC2G34GW,125 |
|---|---|---|---|---|
| Package | SC-70-6 (DCK) | SC-70-6 (DCK) - same | SC-70-6 (DCK) - same | SOT-363 (SC-70-6) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | NXP Semiconductors |
| Supply Voltage | 1.65 V to 5.5 V | 1.65 V to 5.5 V | 0.8 V to 3.6 V | 1.2 V to 5.5 V |
| Automotive Grade | No | Yes (AEC-Q100) | No | No |
| Ioff Partial Power Down | Yes | Yes | Yes | Yes |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
主要差異化特點
- Full 5.5-V supply operation with 5.5-V tolerant inputs (對比SN74AUP2G34DCKR)
- Same-footprint AEC-Q100 upgrade path (對比SN74LVC2G34DCKR-Q1)
- Cross-brand supply-chain security (對比74LVC2G34GW,125)
設計說明
Decouple VCC with a 0.1-uF ceramic capacitor placed within 2 mm of pin 6, with a solid via to the ground plane. The SC-70-6 footprint is small enough that trace inductance to the cap matters; keep the loop area minimal to suppress switching noise on the 24-mA output edges.
Keep buffered traces short and impedance-controlled to preserve the 3.3-ns propagation delay advantage. For traces longer than ~50 mm at fast edges, add a series 22-ohm resistor at the buffer output to damp reflections into unterminated loads and reduce EMI.
Do not exceed 5.5 V on inputs or VCC even briefly; LVC inputs tolerate 5.5 V but have no negative-rail protection, so add a series resistor if signals can undershoot below ground. Remember this device is a unidirectional buffer (Y = A): it cannot replace a bidirectional translator such as SN74LVC1T45 in I2C or shared data buses.
合規資訊
RoHS compliant per DigiKey/TI product listings. AEC-Q100 version available as SN74LVC2G34DCKR-Q1. REACH and halogen-free status not stated in provided data.
