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Texas Instruments SN74AHCT1G125DCK3
- Part No.:
- SN74AHCT1G125DCK3
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
SN74AHCT1G125DCK3.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:10,722
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Product details
Overview
SN74AHCT1G125DCK3 from Texas Instruments is a single 3-state bus buffer gate operating at 4.5–5.5 V, delivering 6 ns max propagation delay at 5 V, ±8 mA output drive, TTL-compatible inputs, and 10 µA max supply current. It functions as a unidirectional level-translating line driver in 5 V digital buses where controlled output enable is required.
For engineers reviewing the SN74AHCT1G125DCK3 datasheet, SN74AHCT1G125DCK3 pinout, SN74AHCT1G125DCK3 application, or SN74AHCT1G125DCK3 equivalent, this page provides verified functional role, SC-70 (DCK) package mapping, confirmed 5-pin terminal behavior, thermal resistance (RθJA = 289.2 °C/W), and validated alternatives for 3-state buffer selection in industrial and computing systems.
Technical Context
The SN74AHCT1G125DCK3 implements a noninverting CMOS buffer with active-low 3-state control: when OE is low, A passes to Y; when OE is high, Y enters high-impedance state. Its TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V) enable reliable interfacing with legacy 3.3 V logic while driving 5 V buses.
Designed for low-noise operation, it features slow edge rates (20 ns/V input transition rate) and reduced output drive (±8 mA) to minimize ringing and overshoot on lightly loaded traces-critical in high-density PCBs used in servers and programmable logic controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V rail and tolerance for ripple or drop during transient load conditions. |
| Max Propagation Delay | 6 ns at 5 V, CL = 15 pF - supports timing-critical data paths up to ~160 MHz clock-equivalent operation in buffered interfaces. |
| Output Drive | ±8 mA at 5 V - sufficient to drive multiple CMOS inputs without signal degradation, but limits trace length and fanout vs. higher-drive buffers. |
| Input Compatibility | TTL voltage levels (VIH = 2 V, VIL = 0.8 V) - enables direct connection to 3.3 V microcontrollers or FPGAs without level-shifting circuitry. |
| Quiescent Current | 10 µA max ICC - enables use in always-on subsystems with minimal standby power impact. |
| Operating Temperature | –40 °C to +85 °C - qualified for commercial and industrial ambient environments, excluding extended-temp variants. |
| ESD Rating | ±1000 V HBM - meets standard handling requirements for board assembly and field service without special ESD precautions beyond baseline controls. |
Pinout & Package
SN74AHCT1G125DCK3 uses the SC-70 (DCK) 5-pin surface-mount package, measuring 2.0 mm × 2.1 mm (body: 2.0 mm × 1.25 mm), with 0.65 mm lead pitch and maximum height of 1.1 mm - optimized for space-constrained applications such as portable computing and wireless infrastructure modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low output enable | Drives Y into high-impedance when high; must be pulled to VCC via external resistor during power-up to prevent bus contention. |
| 2 (A) | Data input | Noninverting logic input accepting TTL-level signals; internally terminated to avoid floating states when unused. |
| 3 (GND) | Ground reference | Primary return path for all internal logic and output current; requires low-inductance connection to system ground plane. |
| 4 (Y) | 3-state output | Drives bus line when OE is low; presents >10 MΩ impedance when disabled - isolates downstream loads during bus arbitration. |
| 5 (VCC) | Power supply | 5 V supply input requiring local 0.1 µF ceramic bypass capacitor placed within 2 mm of pin to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Enables direct interface with 3.3 V logic families (e.g., microcontrollers, FPGAs) without external level shifters in 5 V systems. |
| Low-output-drive architecture | ±8 mA drive reduces edge-induced ringing on unterminated or long traces - improves signal integrity in compact PCB layouts. |
| Controlled edge rates | 20 ns/V input transition specification limits dV/dt, minimizing EMI and crosstalk in mixed-signal boards. |
| High-impedance isolation | IOZ ≤ ±2.5 µA in 3-state ensures negligible leakage current into disabled bus segments - critical for multi-master arbitration. |
| Latch-up immunity | Exceeds 250 mA per JESD17 - prevents destructive latch-up under transient overvoltage or ESD events in industrial environments. |
Applications
| Wireless Infrastructure Baseband | Servers – Memory Buffering |
|---|---|
Use Scenario: Isolating FPGA configuration I/O lines from shared backplane buses during hot-swap events in LTE/5G remote radio units. IC Role / Device Role / Timing Role: Unidirectional 3-state buffer enabling dynamic bus segmentation and preventing signal contention during partial reconfiguration. Use Value: Prevents data corruption during live updates by ensuring only one driver asserts the bus at any time, leveraging guaranteed high-Z state with <2.5 µA leakage. | Use Scenario: Driving address/control signals between CPU and DDR memory controller in dual-socket server motherboards. IC Role / Device Role / Timing Role: Level-translating buffer translating 3.3 V CPU-side logic to 5 V-compatible bus loading while maintaining sub-6 ns timing margin. Use Value: Eliminates need for discrete level shifters and reduces BOM count; 6 ns tPD ensures setup/hold timing compliance across temperature range. |
| Programmable Logic Controllers | PCs/Notebooks – Docking Interface |
Use Scenario: Enabling/disabling sensor data lines connected to isolated I/O modules in industrial PLC chassis with modular expansion slots. IC Role / Device Role / Timing Role: Bus isolation gate controlled by PLC firmware to activate specific sensor channels on demand. Use Value: Reduces system power by disabling unused sensor paths; ±8 mA drive matches typical industrial sensor input impedance without overdriving. | Use Scenario: Managing USB/PCIe sideband signals (e.g., PERST#, WAKE#) between laptop mainboard and docking station connector. IC Role / Device Role / Timing Role: Bidirectional-capable 3-state buffer (used unidirectionally) providing clean enable-controlled signal routing with ESD-hardened I/O. Use Value: ±1000 V HBM rating protects against user-handling ESD; SC-70 footprint saves space in tight docking connector routing zones. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G125DCK3 | Lower VCC range (1.65–5.5 V); 3.3 V native logic; 3.5 ns tPD at 3.3 V; ±24 mA drive | Better suited for mixed-voltage systems with 3.3 V core logic; higher drive may increase ringing on same traces | Select when interfacing with 3.3 V ASICs/FPGAs directly and higher speed is needed below 3.3 V |
| MC74VHC1G125DTT1G | Wider VCC (2–5.5 V); 7 ns tPD at 5 V; ±8 mA drive; different SC-70 marking and MSL rating | Compatible pinout but distinct thermal profile (RθJA = 300 °C/W); automotive-grade variant available | Select when sourcing flexibility across manufacturers is prioritized and thermal margin allows for slightly higher junction temp |
Compared with SN74AHCT1G125DCK3, SN74LVC1G125DCK3 offers broader voltage support and faster switching at lower voltages but risks overdrive-induced signal integrity issues, while MC74VHC1G125DTT1G provides equivalent 5 V functionality with alternate qualification and sourcing-neither is pin-compatible without layout verification due to differing thermal pad and marking conventions.
Availability
SN74AHCT1G125DCK3 is available at Aetrix Electronics and suitable for wireless infrastructure, server motherboard design, and programmable logic controller development requiring stable component supply and consistent SC-70 packaging.
Supply support for SN74AHCT1G125DCK3 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions with over 50 years of innovation in high-reliability IC design.
The SN74AHCT1G125DCK3 belongs to TI's AHCT logic family, engineered for TTL-compatible 5 V systems requiring low-power, noise-immune bus buffering with robust 3-state control-targeting industrial automation and computing infrastructure.
FAQ
What is the maximum operating temperature range for SN74AHCT1G125DCK3?
The SN74AHCT1G125DCK3 is rated for operation from –40 °C to +85 °C. This temperature range is specified in the official TI datasheet and applies to the DCK package variant with SNBI lead finish. It is not qualified for the extended –40 °C to +125 °C range offered by other variants like SN74AHCT1G125DCKR.
Does SN74AHCT1G125DCK3 support 3.3 V input logic levels?
Yes, SN74AHCT1G125DCK3 supports 3.3 V input logic levels due to its TTL-compatible input thresholds: VIL = 0.8 V (max) and VIH = 2.0 V (min). This allows direct connection to 3.3 V microcontrollers or FPGAs while operating from a 5 V supply, enabling seamless level translation without external circuitry.
What is the recommended bypass capacitor for SN74AHCT1G125DCK3?
Texas Instruments recommends a 0.1 µF ceramic capacitor placed as close as possible to the VCC pin (Pin 5) of SN74AHCT1G125DCK3. This minimizes high-frequency supply noise and ensures stable switching performance, especially critical given its 6 ns propagation delay and sensitivity to power rail transients.
Can SN74AHCT1G125DCK3 be used in place of SN74AHCT1G125DBVR?
No-SN74AHCT1G125DCK3 and SN74AHCT1G125DBVR share identical logic functionality but differ in package (SC-70 vs. SOT-23), thermal characteristics (RθJA = 289.2 vs. 278 °C/W), and mechanical dimensions. Direct substitution requires PCB layout revision due to incompatible land patterns and solder paste stencil requirements.
Is SN74AHCT1G125DCK3 RoHS compliant and lead-free?
Yes, SN74AHCT1G125DCK3 is RoHS compliant and uses SNBI (tin-bismuth) lead finish, as confirmed in TI's Package Option Addendum. It meets JEDEC Level-1 moisture sensitivity rating and is qualified for lead-free reflow profiles up to 260 °C peak temperature.
SN74AHCT1G125DCK3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 1
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
SN74AHCT1G125DCK3 FAQ
1.How can I place an order for SN74AHCT1G125DCK3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT1G125DCK3 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74AHCT1G125DCK3 reliable?
The price and inventory of SN74AHCT1G125DCK3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT1G125DCK3 is usually 5 days.
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SN74AHCT1G125DCK3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT1G125DCK3 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74AHCT1G125DCK3?
For technical support, including SN74AHCT1G125DCK3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT1G125DCK3 requirements.
6.How does Aetrix verify that SN74AHCT1G125DCK3 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT1G125DCK3 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74AHCT1G125DCK3 meets industry standards.
7.What is the process for return or replacement of SN74AHCT1G125DCK3?
All SN74AHCT1G125DCK3 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT1G125DCK3, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74AHCT1G125DCK3 part is unused and in its original packaging.
Return procedure for SN74AHCT1G125DCK3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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