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Texas Instruments SN74AHCT1G125DCKR
- Part No.:
- SN74AHCT1G125DCKR
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
SN74AHCT1G125DCKR.pdf
- Description:
- IC BUF NON-INVERT 5.5V SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:31,283
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Product details
Overview
SN74AHCT1G125 from Texas Instruments is a single 3-state bus buffer gate with TTL-compatible inputs, operating at 4.5–5.5 V, delivering ≤6 ns propagation delay at 5 V, ±8 mA output drive, and ≤10 µA supply current. It functions as a unidirectional level-translating line driver in 5 V digital buses where controlled output enable and low-power tri-state isolation are required.
For engineers reviewing the SN74AHCT1G125 datasheet, SN74AHCT1G125 pinout, SN74AHCT1G125 application, or SN74AHCT1G125 equivalent, key selection criteria include its 5-pin SC-70 (DCK) package, guaranteed 3-state leakage <±2.5 µA, input voltage tolerance up to 5.5 V, and compatibility with 3.3 V logic driving 5 V buses.
Technical Context
The SN74AHCT1G125 implements a noninverting 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 = 2.0 V) enable reliable interfacing between 3.3 V drivers and 5 V loads.
Designed for CMOS logic families with AHCT characteristics, it features slow edge rates to suppress output ringing, latch-up immunity >250 mA per JESD17, and ESD protection of ±1000 V HBM / ±1500 V CDM - critical for board-level reliability in industrial and computing environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation across standard 5 V supply tolerances including ripple and droop. |
| tpd (Max) | 6 ns at 5 V, CL = 15 pF - supports high-speed bus timing in servers and PLCs without violating setup/hold margins. |
| IOH/IOL | ±8 mA at 5 V - provides sufficient drive for fanout of ≥10 LS-TTL loads or termination into 50 Ω traces. |
| II (Max) | ±1 µA over –40°C to 125°C - minimizes input loading on upstream drivers, preserving signal integrity. |
| IOZ (Max) | ±2.5 µA at –40°C to 125°C - guarantees robust high-impedance isolation during bus sharing or hot-swap conditions. |
| VIH/VIL | 2.0 V / 0.8 V - enables direct connection to 3.3 V CMOS/TTL outputs without level-shifting circuitry. |
| Operating Temp | –40°C to +125°C - qualified for extended industrial and infrastructure applications including power converters and base stations. |
Pinout & Package
SN74AHCT1G125DCKR 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 PCB layouts in portable and dense compute modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OE | Active-low 3-state enable input | Pulling high disables Y output into high-Z; requires pullup to VCC during power sequencing to prevent bus contention. |
| 2 - A | Noninverting data input | Accepts TTL- or CMOS-level signals; tolerant to 5.5 V regardless of VCC, enabling mixed-voltage domain interfacing. |
| 3 - GND | Ground reference | Must be connected directly to low-impedance ground plane; shared return path for all I/O and supply currents. |
| 4 - Y | 3-state buffered output | Drives bus lines bidirectionally only when enabled; high-Z state isolates downstream capacitance during idle periods. |
| 5 - VCC | Positive supply | Requires local 0.1 µF ceramic bypass capacitor placed within 2 mm of pin to suppress switching noise and ensure stable logic thresholds. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Enables seamless integration with legacy 3.3 V microcontrollers and FPGAs without external level shifters. |
| Slow edge rate control | Reduces output ringing and EMI in unterminated or lightly loaded transmission lines common in backplanes and daughterboards. |
| High-impedance state leakage <±2.5 µA | Prevents unintended current paths in shared-bus architectures such as memory expansion slots or sensor multiplexing networks. |
| 125°C operational rating | Supports deployment in thermally demanding environments like power supply control modules and telecom line cards. |
| JEDEC JESD17 latch-up immunity >250 mA | Ensures robustness against transient overvoltage events and ground bounce in noisy industrial power systems. |
Applications
| Wireless Infrastructure Baseband | Servers and Storage Controllers |
|---|---|
Use Scenario: Isolating FPGA configuration I/O banks from shared JTAG or SPI debug buses during firmware updates. IC Role / Device Role / Timing Role: Unidirectional 3-state buffer enabling selective access to test interfaces without disrupting active data paths. Use Value: Prevents bus contention during hot-reconfiguration while maintaining signal integrity across 10+ cm trace lengths. | Use Scenario: Driving address/data strobes between CPU and DDR4 memory controller in multi-slot server motherboards. IC Role / Device Role / Timing Role: Level-translating bus buffer synchronizing 3.3 V SoC outputs with 5 V peripheral logic domains. Use Value: Eliminates need for discrete resistive dividers or dedicated level translators, reducing BOM count and layout area. |
| Programmable Logic Controllers | Industrial Power Converters |
Use Scenario: Enabling/disabling analog-to-digital converter (ADC) serial interface lines based on real-time control loop status. IC Role / Device Role / Timing Role: Controlled gate for SPI clock and data lines, ensuring clean signal transitions during mode switching. Use Value: Guarantees glitch-free communication startup and shutdown, avoiding ADC misreads or register corruption. | Use Scenario: Buffering PWM enable signals from isolated gate drivers to high-side MOSFET controllers in DC-DC modules. IC Role / Device Role / Timing Role: Robust 3-state interface isolating control logic from high-noise power stage domains. Use Value: Maintains precise timing margins under 100+ V/ns dv/dt transients while surviving repeated ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G125DCKR | Lower VCC range (1.65–5.5 V); higher drive (±32 mA); faster tpd (3.7 ns typ) | Better suited for mixed-voltage systems (1.8 V/2.5 V/3.3 V/5 V) but less immune to ringing on long traces | Select when wider supply flexibility or higher fanout is needed; verify trace impedance matching due to steeper edges. |
| MC74VHC1GT125DTT1G | Wider VCC (2–5.5 V); lower ICC (1 µA typ); same 5-pin SC-70 package | Optimized for ultra-low-power battery-backed subsystems; slightly reduced noise margin at 5 V | Prefer for energy-sensitive applications like remote sensors; confirm VIH/VIL compatibility with 3.3 V drivers. |
Compared with SN74AHCT1G125DCKR, SN74LVC1G125DCKR offers broader voltage support and higher drive but demands tighter layout control, while MC74VHC1GT125DTT1G delivers superior static power efficiency at the cost of marginal noise immunity in high-noise 5 V rail environments.
Availability
SN74AHCT1G125DCKR is available at Aetrix Electronics and suitable for wireless infrastructure, industrial PLCs, and server motherboard designs requiring stable component supply, consistent parametric performance across temperature, and long-term production continuity.
Supply support for SN74AHCT1G125DCKR 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 connectivity technologies, with decades of experience in high-reliability logic and interface solutions.
SN74AHCT1G125 belongs to TI's AHCT logic family - engineered for 5 V systems requiring TTL compatibility, low power, and robust 3-state bus control in industrial, computing, and communications equipment.
FAQ
What is the absolute maximum supply voltage for SN74AHCT1G125DCKR?
The absolute maximum VCC rating for SN74AHCT1G125DCKR is 7 V, but continuous operation must remain within the recommended 4.5 V to 5.5 V range. Exceeding 5.5 V risks parametric degradation and reduced long-term reliability, even if below the 7 V stress limit defined in Section 5.1 of the datasheet.
Does SN74AHCT1G125DCKR support 3.3 V input logic levels?
Yes, SN74AHCT1G125DCKR accepts 3.3 V logic inputs reliably: its VIH threshold is 2.0 V min and VIL is 0.8 V max at 5 V VCC, providing 0.3 V noise margin for standard 3.3 V CMOS outputs. Inputs are also overvoltage tolerant up to 5.5 V independent of VCC.
What is the thermal resistance (RθJA) of SN74AHCT1G125DCKR in its SC-70 package?
SN74AHCT1G125DCKR has a junction-to-ambient thermal resistance (RθJA) of 289.2 °C/W in the SC-70 (DCK) package, measured under JEDEC-standard conditions (1s² copper pad, 1-layer board). This value assumes proper PCB copper pour and thermal vias for heatsinking in high-density layouts.
Can SN74AHCT1G125DCKR be used in automotive applications?
Standard SN74AHCT1G125DCKR is not AEC-Q100 qualified. For automotive use, TI specifies SN74AHCT1G125-Q1 - a tested and qualified variant with extended temperature screening, enhanced ESD robustness, and full PPAP documentation. Use SN74AHCT1G125-Q1 in ADAS, body control, or infotainment modules.
How does the 3-state enable (OE) pin behave during power-up?
During power-up, OE must be held high (via pullup resistor to VCC) to ensure Y remains in high-impedance state until system initialization completes. TI recommends a minimum pullup resistor value determined by the driver's sink capability - typically 10 kΩ suffices for most microcontroller GPIOs driving OE.
SN74AHCT1G125DCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- 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
SN74AHCT1G125DCKR FAQ
1.How can I place an order for SN74AHCT1G125DCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT1G125DCKR 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 SN74AHCT1G125DCKR reliable?
The price and inventory of SN74AHCT1G125DCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT1G125DCKR is usually 5 days.
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Once your SN74AHCT1G125DCKR 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 SN74AHCT1G125DCKR?
For technical support, including SN74AHCT1G125DCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT1G125DCKR requirements.
6.How does Aetrix verify that SN74AHCT1G125DCKR is sourced from the original manufacturer or authorized distributors?
All SN74AHCT1G125DCKR 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 SN74AHCT1G125DCKR meets industry standards.
7.What is the process for return or replacement of SN74AHCT1G125DCKR?
All SN74AHCT1G125DCKR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT1G125DCKR, 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 SN74AHCT1G125DCKR part is unused and in its original packaging.
Return procedure for SN74AHCT1G125DCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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