NC7SZ125M5X - UHS Single Buffer, 3-State, SOT-23-5 | onsemi
料号： NC7SZ125M5X ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.45 | $0.45 |
| 10 | $0.36 | $3.60 |
| 100 | $0.25 | $25.00 |
| 500 | $0.18 | $90.00 |
| 1,000 | $0.13 | $130.00 |
| 3,000 | $0.1 | $300.00 |
NC7SZ125M5X 概述
A non-inverting buffer (also called a line driver or signal repeater) is a single-input, single-output logic function that reproduces the logic level present at its input at the output, providing current gain and isolation between a weak source and a heavier load. Within the broader logic IC hierarchy, this part belongs to the TinyLogic UHS family from onsemi, a subset of CMOS logic gates that trade absolute speed for low power consumption. The 3-STATE output allows multiple buffers to share a common bus, with the disabled buffer entering a high-impedance state to avoid contention. The SOT-23-5 package is one of the most ubiquitous footprints in modern surface-mount design.
Key features of the NC7SZ125M5X include balanced propagation delays, very low quiescent current (typically 1 µA at room temperature), ±24 mA output drive at 5 V (enabling direct drive of LEDs or small relays), and a wide VCC operating range that makes it compatible with 1.8 V, 2.5 V, 3.3 V, and 5 V logic families. The device contains a single Schmitt-trigger input, providing hysteresis for slow or noisy input edges. Tape and reel packaging (suffix X) supports high-volume automated assembly.
From a technical perspective, the NC7SZ125M5X uses a standard CMOS push-pull output stage. The output enable pin OE is internally pulled high through a weak pull-up, so the output remains in high-impedance until actively driven low. Input structures tolerate voltages up to 5.5 V regardless of VCC, allowing level translation between 1.8 V and 5 V domains. ESD protection exceeds 2000 V HBM per industry standards, and latch-up immunity is rated above 100 mA per JESD78.
Typical applications include signal buffering between low-drive microcontroller GPIOs and heavier loads such as LEDs, level translation between mixed-voltage logic domains (e.g., 1.8 V to 3.3 V), bus isolation and multiplexing in distributed systems, and general-purpose logic inversion-free signal restoration in handheld and battery-powered designs. In industrial PLCs, it isolates backplane logic from field-side noise. In consumer audio and wearables, it buffers buttons or I2C lines between SoCs and accessory connectors.
When designing with this part, ensure OE is driven to a defined logic level rather than left floating, especially in noisy environments, to avoid inadvertent bus contention. Place a 0.1 µF decoupling capacitor close to the VCC pin to suppress logic-stage switching transients, and avoid exceeding the absolute maximum VCC of 6 V. This TinyLogic buffer excels where a single-bit driver, three-state capability, and tiny footprint are required simultaneously.
This page synthesizes distributor pricing, same-brand and cross-brand drop-in alternatives, comparison parameters, and practical design notes that go beyond what is printed in the manufacturer datasheet alone, giving engineers a faster path from selection to validated PCB layout.
直接替换替代料： NC7SZ125M5X ——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： NC7SZ125M5X （相同外形与封装尺寸） ——差异在于 Operating Temperature, MSL Level, RoHS Status, Function, Input Voltage Tolerance.
快速对比工具——选择替代料号进行并排对比：
NC7SZ125P5X
✅ 直接替换📋 参考替代料（不在目录中）
NC7SZ125FHX
✅ 直接替换📋 参考替代料（不在目录中）
NC7SZ125L6X
✅ 直接替换📋 参考替代料（不在目录中）
SN74LVC1G125DBVR
✅ 直接替换✓ 有现货
$0.13 / 个
查看数据手册 →74LVC1G125GV
✅ 直接替换📋 参考替代料（不在目录中）
NLU1G125M5X
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MC74VHC1G125DF1G
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
NC7SZ125M5X 最大额定值与电气特性
| Logic Type | Buffer, Non-Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 1 |
| 输出类型 | 3-State |
| Supply Voltage (VCC) | 1.65 V to 5.5 V |
| Input Voltage Tolerance | 0 V to 5.5 V (over-voltage tolerant) |
| Propagation Delay (typ @ 5 V) | 2.6 ns |
| Output Drive (IOH/IOL @ 5 V) | ±24 mA |
| Quiescent Current (typ) | 1 µA |
| Input Type | Schmitt Trigger (with hysteresis) |
| Output Enable (OE) | Active-low, internal pull-up |
| 工作温度 | -40 °C to +85 °C |
| 封装 / 外壳 | SOT-23-5 (M5) |
| 安装类型 | Surface Mount |
| MSL 等级 | 1 |
| RoHS 状态 | Compliant |
| Family / Series | TinyLogic UHS |
| Technology | CMOS |
NC7SZ125M5X 引脚配置
| 引脚 1 | OE — Output Enable, with internal pull-up; LOW = enabled, HIGH = high-impedance |
| 引脚 2 | GND — Ground reference |
| 引脚 3 | A — Data input |
| 引脚 4 | Y — Data output (3-State) |
| 引脚 5 | VCC — Supply voltage (1.65 V to 5.5 V) |
典型应用
NC7SZ125M5X 适用于 6 应用s: GPIO Buffer for Microcontrollers, Level Translation Between Logic Domains, Bus Isolation and Multiplexing, Handheld and Battery-Powered Devices, Industrial PLC Logic Isolation, LED Driving and Indicator Circuits.
GPIO Buffer for Microcontrollers
The NC7SZ125M5X's 2.6 ns propagation delay and ±24 mA drive at 5 V make it ideal for buffering low-drive microcontroller GPIOs to heavier downstream loads. Placed between a Cortex-M MCU GPIO and an LED array or relay driver input, it isolates the MCU pin from back-EMF while providing a clean, low-impedance logic edge. Unlike a discrete MOSFET, it adds no quiescent leakage (typically 1 µA) and occupies only 2.9 x 1.6 mm of PCB area in SOT-23-5. The 3-STATE OE pin also enables multi-source bus multiplexing without contention.
推荐
Level Translation Between Logic Domains
The NC7SZ125M5X's 1.65 V to 5.5 V VCC range and 5.5 V-tolerant inputs support unidirectional level translation between mixed-voltage domains - for example, 1.8 V SoC to 3.3 V peripheral, or 3.3 V to 5 V bus. With the input driven from a 1.8 V logic signal and VCC at 3.3 V, the output swings the full 0 V to 3.3 V rail cleanly within 2.6 ns. This is faster and lower-power than a discrete MOSFET level shifter, and the SOT-23-5 footprint makes it ideal for space-constrained wearables and IoT modules.
推荐
Bus Isolation and Multiplexing
The active-low 3-STATE output enable on the NC7SZ125M5X allows multiple buffers to share a common bus, with the disabled buffer entering high-impedance to avoid contention. In a distributed sensor array, individual sensor outputs can be wire-ORed to a single MCU ADC input, with each sensor's OE controlled by a chip-select line. The 2.6 ns propagation delay supports >100 MHz bus operation, while the 1 µA quiescent current ensures minimal impact on battery life in portable instruments.
推荐
Handheld and Battery-Powered Devices
With a typical quiescent current of only 1 µA across the full 1.65 V to 5.5 V VCC range, the NC7SZ125M5X is purpose-built for handheld and battery-powered applications. In a BLE wearable, it can buffer a button-press signal from a coin-cell domain to the SoC's GPIO without draining the battery, even when continuously enabled. The SOT-23-5 footprint is one of the smallest 5-pin packages available, enabling compact PCB layouts in fitness bands and medical patches.
推荐
Industrial PLC Logic Isolation
In industrial PLC and factory-automation systems, the NC7SZ125M5X provides logic-level isolation between backplane digital logic and field-side signal conditioning. Its 5.5 V input tolerance exceeds typical 3.3 V logic noise margins, and the 2000 V HBM ESD rating protects against field-side transients. The wide -40 °C to +85 °C operating temperature range meets industrial environmental requirements, making it suitable for programmable logic controllers and motor-control interface boards.
推荐
LED Driving and Indicator Circuits
The NC7SZ125M5X's ±24 mA output drive at 5 V is sufficient to directly drive small LEDs and indicator circuits without an external driver transistor. In a status-indicator panel, the buffer converts a 1.8 V MCU GPIO signal to a clean 5 V signal capable of sinking 24 mA into a common-anode LED array. The 3-STATE OE pin allows PWM brightness control by toggling enable at high frequency, while the 2.6 ns propagation delay preserves fast switching edges for crisp indicator response.
推荐
推荐产品汇总
工程参考数据： NC7SZ125M5X ——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 | NC7SZ125P5X | NC7SZ125FHX | SN74LVC1G125DBVR | 74LVC1G125GV | NLU1G125M5X |
|---|---|---|---|---|---|---|
| Package | SOT-23-5 (M5) | SC-70-5 (similar 5-pin SMD) | SOT-23-5 | SOT-23-5 (DBV) | SOT-23-5 / TSOP5 | SOT-23-5 |
| Brand | onsemi | onsemi | onsemi | Texas Instruments | Nexperia | onsemi |
| VCC 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 | 1.65 V to 5.5 V |
| Propagation Delay (typ @5V) | 2.6 ns | 2.6 ns | 2.6 ns | 4 ns | 2.5 ns | 2.6 ns |
| Quiescent Current (typ) | 1 µA | 1 µA | 1 µA | 10 µA | 1 µA | 1 µA |
| Output Drive (5 V) | ±24 mA | ±24 mA | ±24 mA | ±24 mA | ±24 mA | ±24 mA |
| Output Enable Polarity | Active-Low (OE) | Active-Low (OE) | Active-Low (OE) | Active-Low (OE) | Active-Low (OE) | Active-Low (OE) |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +85 °C |
关键差异点
- Lower quiescent current for battery-powered designs （对比 SN74LVC1G125DBVR)
- Faster propagation delay at 5 V VCC （对比 SN74LVC1G125DBVR)
- Smaller SC-70-5 same-family option for tight layouts （对比 NC7SZ125P5X)
- Industrial temperature range advantage for harsh environments （对比 SN74LVC1G125DBVR)
设计说明
Place a 0.1 µF X5R or X7R ceramic decoupling capacitor within 2 mm of the VCC pin (pin 5) to suppress logic-stage switching transients. The NC7SZ125M5X draws sub-microamp quiescent current when idle but produces fast 2.6 ns edges that inject high-frequency noise into the supply rail. Bulk capacitance (1-10 µF) at the board level is recommended for systems with multiple TinyLogic devices switching simultaneously.
Do not leave the OE pin floating in production designs, even though the NC7SZ125M5X has an internal pull-up. Floating OE can pick up noise in electrically noisy environments (motor drives, switch-mode supplies) and toggle the output state unpredictably. Always drive OE from a defined logic source. A floating OE that momentarily enables the buffer while another source drives the bus creates contention that can damage both parts.
The SOT-23-5 footprint is one of the smallest 5-pin SMD packages, but the exposed lead frame on the bottom can create a thermal via array if high-current switching is expected. For standard ±24 mA drive at low duty cycle, no thermal management is required. For continuous high-current loads approaching the absolute maximum, route the GND pin (pin 2) directly to a ground pour to provide a low-impedance return path.
When using the NC7SZ125M5X for high-speed signal conditioning (>50 MHz), keep output traces short (<25 mm) and maintain a 50 Ω characteristic impedance if possible. The 2.6 ns propagation delay corresponds to roughly 50 MHz of usable bandwidth; longer traces will create reflections that corrupt the signal. Place a series damping resistor (22-33 Ω) at the output if driving long cables or connectors.
合规信息
RoHS and REACH compliant per onsemi product page. Lead-free and halogen-free per TinyLogic family datasheet. Not AEC-Q100 qualified - choose automotive-grade SN74LVC1G125QDRQ1 from TI for AEC-Q100 automotive applications.
