SN74LVC2G125DCUR - Dual Bus Buffer 3-State Output | Texas Instruments
MPN: SN74LVC2G125DCUR ✓ فعالSN74LVC2G125DCUR جائزہ
A bus buffer (also called a line driver or 3-state buffer) is a non-inverting signal-routing building block used to isolate a source from a shared bus, increase fan-out, or provide bidirectional control over which device drives a line. Buffers belong to the broader logic IC family (combinational logic), which sits under the digital semiconductor hierarchy. The SN74LVC2G125 implements LVC (Low-Voltage CMOS) technology, which is a sub-family of CMOS logic optimized for low static power and 5 V-tolerant I/O on mixed-voltage rails.
Key features include a typical propagation delay (tpd) of 3.7 ns at 3.3 V, ±24 mA output drive capability (IoL/IoH) at 3.3 V, support of partial-power-down applications through Ioff circuitry that disables outputs to prevent backflow current, and an operating temperature range of -40 °C to +125 °C. The LVC2G family provides 5.5 V tolerance on the input pins even when VCC is lower, enabling level translation between 1.8 V, 3.3 V, and 5 V domains.
From an architectural perspective, the device uses TI's EPIC (Enhanced-Performance Implanted CMOS) submicron process, giving it ESD protection exceeding 2000 V per MIL-STD-883 Method 3015 and 200 V using the machine model (C = 200 pF, R = 0 Ω). Each buffer consists of an input stage, an output-enable gate, and a 3-state CMOS output stage with controlled rise/fall symmetry.
Typical applications include I2C/SPI bus isolation, point-to-point signal buffering on memory and module interfaces, GPIO expansion in microcontroller boards, level shifting between 1.8 V / 3.3 V / 5 V logic domains, and fan-out extension for low-drive clock or reset lines. The compact VSSOP-8 footprint makes it suitable for handheld and space-constrained designs.
When designing with this device, ensure the OE pin is driven to a defined logic level (tie to GND through a pull-down if unused) to prevent the output from floating into a high-impedance state unintentionally. Decoupling VCC with a 0.1 µF ceramic capacitor placed within 5 mm of the supply pin is recommended for clean switching at high frequencies.
This page synthesizes real-time distributor pricing, validated drop-in alternatives, and practical PCB design guidance for the SN74LVC2G125DCUR that goes beyond the manufacturer datasheet alone, helping engineers evaluate sourcing and design trade-offs at a glance.
کے لیے ڈراپ اِن متبادل SN74LVC2G125DCUR — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں SN74LVC2G125DCUR (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Package, Operating Temperature, RoHS Status, ESD Protection (HBM), Function.
SN74LVC2G125DCURG4
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
SN74LVC2G125DCUT
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SN74LVC2G125DCTR
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SN74LVC2G125YZPR
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74LVC2G125DCURE4
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SN74LVC2G125DCU
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SN74LVC2G125DCUR زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| Logic Type | Buffer, Non-Inverting |
| Number of Elements | 2 |
| Bits per Element | 1 |
| آؤٹ پٹ کی قسم | 3-State |
| Supply Voltage (VCC) | 1.65 V to 5.5 V |
| Input Voltage Tolerance | 5.5 V (5.5 V tolerant inputs) |
| Output Drive (IoL/IoH) at 3.3 V | ±24 mA |
| Output Enable | Active-Low (OE-bar), one per channel |
| آپریٹنگ درجہ حرارت | -40 °C to +125 °C |
| پیکیج | 8-pin VSSOP (DCU) |
| ماؤنٹنگ ٹائپ | Surface Mount |
| MSL لیول | 1 (per TI packaging info) |
| RoHS اسٹیٹس | Compliant |
| Lead-Free | Yes |
| Process Technology | EPIC CMOS (TI submicron) |
| ESD Protection (HBM) | >2000 V per MIL-STD-883 Method 3015 |
SN74LVC2G125DCUR پن کنفیگریشن
| پن 1 | 1OE — Output Enable for channel 1 (active LOW) |
| پن 2 | 1A — Channel 1 input |
| پن 3 | 2Y — Channel 2 output |
| پن 4 | GND — Ground |
| پن 5 | 2A — Channel 2 input |
| پن 6 | 1Y — Channel 1 output |
| پن 7 | 2OE — Output Enable for channel 2 (active LOW) |
| پن 8 | VCC — Supply voltage (1.65 V to 5.5 V) |
عام استعمالات
SN74LVC2G125DCUR کے لیے موزوں ہے 6 ایپلیکیشنs: I2C / SPI Clock and Data Line Buffering, Level Translation Between 1.8 V / 3.3 V / 5 V Domains, GPIO Expansion on Microcontroller Boards, Fan-Out Extension for Clock and Reset Lines, Shared Bus Multiplexing for Memory / Module Interfaces, Industrial Control Signal Conditioning.
I2C / SPI Clock and Data Line Buffering
The SN74LVC2G125DCUR is well-suited for buffering unidirectional clock and data lines in I2C and SPI interfaces because its 5.5 V-tolerant inputs and 1.65-5.5 V VCC range allow level shifting between 1.8 V microcontrollers and 3.3 V or 5 V peripherals without external translators. Placed between the controller SCK/MOSI pins and the peripheral side with the OE pin tied low for always-enabled, the device's ±24 mA output drive can fan out to multiple downstream devices. Unlike a passive pull-up, this active buffer provides controlled rise/fall times that improve signal integrity on long PCB traces. Note: for bidirectional SDA isolation use a dedicated I2C buffer like TCA9517 instead.
تجویز کردہ
Level Translation Between 1.8 V / 3.3 V / 5 V Domains
The SN74LVC2G125DCUR is ideal for voltage domain translation because it accepts 5.5 V on its inputs even when VCC is as low as 1.65 V, enabling up-translation from 1.8 V GPIO to 3.3 V or 5 V peripherals. The output drive is referenced to VCC, so a 3.3 V VCC produces 3.3 V outputs regardless of input voltage. With two independent buffers per IC, it replaces two discrete level-shifters (e.g., discrete MOSFET circuits) on the same PCB footprint. The LVC family's low static current (~10 µA ICC) makes it suitable for battery-powered IoT devices that must bridge to legacy 5 V sensors.
تجویز کردہ
GPIO Expansion on Microcontroller Boards
The SN74LVC2G125DCUR enables GPIO expansion and bus isolation on microcontroller boards where the MCU has insufficient output pins or where multiple slaves share a common bus. By placing each device's output-enable pin under an MCU GPIO, the designer can selectively connect or disconnect downstream peripherals without power-cycling them, enabling hot-swappable daughter cards and modular architectures. The VSSOP-8 footprint occupies only 2.3 x 2.0 mm of board area, ideal for compact designs like wearables and sensor modules.
تجویز کردہ
Fan-Out Extension for Clock and Reset Lines
The SN74LVC2G125DCUR extends fan-out for low-current clock and reset lines where the source device cannot drive multiple loads simultaneously. With ±24 mA output drive at 3.3 V, a single MCU clock pin can drive multiple peripherals through one buffer per load group, preventing rise/fall time degradation. The 3-state OE enables clean multiplexing - tie one buffer always-enabled (OE=low) for the active clock, and use the second buffer for a gated reset that is high-impedance during normal operation.
تجویز کردہ
Shared Bus Multiplexing for Memory / Module Interfaces
The SN74LVC2G125DCUR enables shared-bus multiplexing between two source devices driving a common load, which is essential in multi-master memory systems and modular interface designs. With OE controlled by an arbiter, exactly one buffer drives the bus at any time while the other enters high-impedance, preventing contention. The 3-state output's sub-5 ns enable/disable time supports MHz-rate bus turnaround. Common use cases include selecting between primary and backup memory, or arbitrating between internal and external processor buses.
تجویز کردہ
Industrial Control Signal Conditioning
The SN74LVC2G125DCUR is well-suited for industrial control signal conditioning over its -40 °C to +125 °C operating temperature range and ESD protection exceeding 2000 V per MIL-STD-883. Used as the input buffer between field-side sensors/actuators and a controller-side MCU, it provides noise immunity through controlled output edges and protects downstream logic through 5.5 V input tolerance. The EPIC CMOS process gives reliable operation in factory-automation environments with electromagnetic interference.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا SN74LVC2G125DCUR — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
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متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | SN74LVC2G125DCURG4 | SN74LVC2G125DCUT | SN74LVC2G125DCTR | SN74LVC2G125YZPR | 74LVC2G125DCURE4 | SN74LVC2G125DCU |
|---|---|---|---|---|---|---|---|
| Package | 8-VSSOP (DCU) 2.3x2.0 mm | 8-VSSOP (DCU) - same | 8-VSSOP (DCU) - same | 8-SSOP (DCT) 2.95x2.8 mm | 8-DSBGA (YZP) wafer-level | 8-VSSOP (DCU) - same | 8-VSSOP (DCU) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Logic Function | Dual non-inverting buffer | Dual non-inverting buffer | Dual non-inverting buffer | Dual non-inverting buffer | Dual non-inverting buffer | Dual non-inverting buffer | Dual non-inverting buffer |
| Supply Voltage (VCC) | 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 | 1.65 V to 5.5 V |
| Output Drive at 3.3 V | ±24 mA | ±24 mA | ±24 mA | ±24 mA | ±24 mA | ±24 mA | ±24 mA |
| Output Enable Polarity | Active-Low (per channel) | Active-Low | Active-Low | Active-Low | Active-Low | Active-Low | Active-Low |
| 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 | -40 °C to +125 °C | -40 °C to +125 °C |
| RoHS / Lead-Free | Compliant / Yes | Compliant / Yes | Compliant / Yes | Compliant / Yes | Compliant / Yes | Compliant / Yes | Compliant / Yes |
اہم امتیازی خصوصیات
- Compact dual-channel VSSOP-8 footprint (بمقابلہSN74LVC1G125DCKR (single-channel SC-70))
- 5.5 V input tolerance with low-voltage VCC (بمقابلہGeneric CMOS buffers without Ioff)
- Independent OE per channel (بمقابلہSingle OE buffer variants)
ڈیزائن نوٹس
Decouple VCC (pin 8) with a 0.1 µF X7R ceramic capacitor placed within 5 mm of the supply pad, plus a 1 µF bulk capacitor on the same VCC rail. The SN74LVC2G125 has switching transients of tens of mA during output edges; insufficient decoupling will cause VCC droop that propagates to neighboring logic and may corrupt the buffered signal. Connect the GND pad directly to the ground plane via a short via array.
The VSSOP-8 (DCU) package is 2.3 mm × 2.0 mm with 0.5 mm pitch pads - use the TI land pattern from the package datasheet SCES644 for accurate footprints. Expose the GND pad underneath the package to a continuous ground plane; do not route signal traces under the body. For high-speed signals (>50 MHz), use controlled-impedance traces (typically 50 Ω single-ended) and avoid 90° bends.
Always drive the OE pin to a defined logic level - do not leave it floating, or the output state becomes undefined and may oscillate or float into high-Z unintentionally. Tie unused OE inputs to GND via 10 kΩ pull-down resistors to keep outputs enabled by default. For level-translation use cases, ensure VCC of the buffer matches the HIGH-level voltage of the receiving side, since output swing is VCC-referenced.
The ±24 mA output drive is rated at 3.3 V VCC; at lower VCC (e.g., 1.8 V), the actual drive current is reduced proportionally and may not meet fast rise-time requirements for long traces. For clock distribution at >50 MHz with cable or backplane loads, use a stronger buffer like SN74LVC2G17 or SN74LVC1G34. Add a small series resistor (22-33 Ω) near the output to dampen transmission-line reflections on long traces.
تعمیل کی معلومات
RoHS compliant per TI product page and distributor listings. AEC-Q100 not applicable for standard grade - the part is qualified to industrial temperature range -40C to +125C. Halogen-free status not explicitly stated in verified data - marked unknown per data authenticity rules.
