My Inquiry
My Account
Texas Instruments SN74AHCT1G125DCKT
- Part No.:
- SN74AHCT1G125DCKT
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
SN74AHCT1G125DCKT.pdf
- Description:
- IC BUF NON-INVERT 5.5V SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:119
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74AHCT1G125 from Texas Instruments is a single-channel 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, and TTL-compatible inputs. It functions as a unidirectional level-translating line driver in 5 V data buses, enabling controlled signal routing in server backplanes and industrial PLC I/O modules.
For engineers reviewing the SN74AHCT1G125 datasheet, SN74AHCT1G125 pinout, SN74AHCT1G125 application, or SN74AHCT1G125 equivalent, key selection criteria include its 5-pin SC-70 (DCK) package, 3-state enable control timing (tPZH/tPHZ ≤ 8.5 ns), low ICC (≤10 µA), and compatibility with 3.3 V-to-5 V up-translation in space-constrained embedded interfaces.
Technical Context
The SN74AHCT1G125 implements a noninverting CMOS buffer with active-low 3-state output enable (OE). Its TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V) allow direct interfacing with legacy 3.3 V logic while driving 5 V bus loads. The device uses balanced output drive and features slow edge rates to suppress ringing on lightly loaded traces.
Functional operation is defined by a two-input truth table: when OE = L, Y = A; when OE = H, Y = high-impedance. No internal pull-ups or latches are present - external biasing of OE is required for power-up safety. Thermal resistance (RθJA = 289.2 °C/W) reflects its SC-70 package's limited heat dissipation capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL/CMOS systems and tolerance to rail droop. |
| Max Propagation Delay | 6 ns at 5 V, CL = 15 pF - enables reliable operation in sub-100 MHz digital control paths. |
| Output Drive | ±8 mA at 5 V - sufficient to drive one standard TTL load or multiple CMOS inputs without buffering. |
| Input Compatibility | TTL voltage levels (VIH = 2 V, VIL = 0.8 V) - allows direct connection to 3.3 V microcontrollers and FPGAs without level shifters. |
| Quiescent Current | 10 µA max ICC - supports low-power standby modes in battery-backed or energy-sensitive applications. |
| Operating Temperature | –40 °C to +125 °C - qualified for industrial and extended-temperature embedded environments. |
| ESD Rating | ±1000 V HBM - meets standard handling requirements for automated assembly and field service. |
Pinout & Package
SN74AHCT1G125DCKT is packaged in a 5-pin SC-70 (DCK) surface-mount package measuring 2.0 mm × 2.1 mm (body: 2.0 mm × 1.25 mm), optimized for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OE | Active-low 3-state enable input | Drives output Y to high-impedance when high; must be pulled to VCC via external resistor during power-up to prevent bus contention. |
| 2 - A | Noninverting data input | Accepts TTL-level signals; compatible with 3.3 V logic outputs; no internal termination required. |
| 3 - GND | Ground reference | Primary return path for supply current and signal integrity; requires low-inductance connection to system ground plane. |
| 4 - Y | 3-state buffered output | Delivers inverted-pass-through signal when OE = L; presents >10⁶ Ω impedance when OE = H per datasheet IOZ spec. |
| 5 - VCC | Positive supply | Must be bypassed with 0.1 µF ceramic capacitor placed within 2 mm of pin to suppress switching noise and ensure stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Slow edge rate control | Reduces output ringing and EMI in unterminated transmission lines, eliminating need for series termination resistors in short-run interconnects. |
| TTL-compatible inputs | Enables seamless 3.3 V-to-5 V up-translation without external level-shifting circuitry, lowering BOM count and layout complexity. |
| Low quiescent power | 10 µA max ICC allows integration into always-on monitoring circuits without compromising system-level power budgets. |
| High-impedance isolation | IOZ ≤ ±2.5 µA in 3-state mode ensures negligible leakage current when disabled, preventing unintended loading of shared bus segments. |
| Latch-up immunity | Exceeds 250 mA per JESD17 - eliminates risk of destructive latch-up under transient overvoltage or hot-swap conditions. |
Applications
| Server Backplane Interface | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Isolating configuration registers and status lines between FPGA management logic and hot-swappable I/O modules. IC Role / Device Role / Timing Role: Unidirectional 3-state buffer enabling dynamic bus arbitration and preventing signal contention during module insertion/removal. Use Value: Eliminates need for discrete MOSFET switches or complex bus controllers while maintaining <6 ns timing margin for 100 MHz control clocks. |
Use Scenario: Driving LED indicators and relay drivers from microcontroller GPIO pins sharing a common 5 V bus. IC Role / Device Role / Timing Role: Level-translating buffer isolating 3.3 V MCU outputs from 5 V industrial loads with precise enable-controlled output gating. Use Value: Supports simultaneous drive of up to four 5 V LEDs (at 8 mA each) without additional current amplification stages. |
| Test Equipment Signal Routing | Embedded Sensor Hub Interface |
Use Scenario: Multiplexing calibration signals between precision ADC references and multiple sensor front-end channels. IC Role / Device Role / Timing Role: Low-noise, high-Z buffer minimizing capacitive loading on sensitive analog reference nodes during digital switching. Use Value: Input capacitance of 10 pF and off-state leakage <2.5 µA preserve reference stability and reduce measurement drift in 24-bit systems. |
Use Scenario: Interfacing MEMS accelerometers and temperature sensors with different voltage domains to a central 5 V microcontroller bus. IC Role / Device Role / Timing Role: Directional voltage translator ensuring clean 3.3 V sensor data transfer into 5 V logic domain without signal inversion or timing skew. Use Value: Guaranteed 6 ns tPLH/tPHL ensures synchronization across multi-sensor timestamping with <1 ns jitter contribution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G125DCKT | Wider supply range (1.65–5.5 V), lower drive (±24 mA), higher speed (3.5 ns typ), but not TTL-input compatible. | Suitable for mixed-voltage systems with 1.8 V/2.5 V/3.3 V logic; unsuitable where legacy 3.3 V TTL outputs require guaranteed recognition. | Select when operating below 4.5 V or requiring faster switching; verify input threshold compatibility with source logic family. |
| MC74VHC1GT125DTT1G | Same 5 V operation, identical pinout, but higher ICC (1 µA typ vs. 10 µA max), slightly slower tPD (7.5 ns max), and lower ESD rating (±2 kV HBM). | Valid for cost-sensitive industrial designs where ultra-low standby current is noncritical and ESD environment is controlled. | Prefer for price-driven volume production where TI's 125°C rating and ±1000 V HBM are not mandatory. |
Compared with SN74AHCT1G125DCKT, SN74LVC1G125DCKT offers broader voltage flexibility but sacrifices guaranteed TTL input recognition, while MC74VHC1GT125DTT1G matches pinout and function at lower cost but trades off thermal robustness and ESD resilience - making SN74AHCT1G125DCKT optimal for 5 V-only, high-reliability industrial interfaces.
Availability
SN74AHCT1G125DCKT is available at Aetrix Electronics and suitable for server backplanes, industrial PLC I/O expansion, test equipment signal routing, and embedded sensor hub interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHCT1G125DCKT 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 over 90 years of innovation in industrial, automotive, and communications markets.
The SN74AHCT1G125 belongs to TI's 74AHCT logic family, designed specifically for robust 5 V bus interface applications requiring TTL compatibility, low power, and high noise immunity in harsh industrial environments.
FAQ
What is the recommended power supply bypassing for SN74AHCT1G125DCKT?
A 0.1 µF ceramic capacitor must be placed between VCC and GND, located within 2 mm of the SN74AHCT1G125DCKT package. This minimizes high-frequency supply noise and prevents output instability during fast transitions. For systems with multiple logic devices, parallel 0.1 µF and 1 µF capacitors are recommended to cover broader noise spectra.
Can SN74AHCT1G125DCKT interface directly with 3.3 V microcontrollers?
Yes - SN74AHCT1G125DCKT accepts 3.3 V logic levels as valid inputs due to its TTL-compatible thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V). A 3.3 V GPIO driving the A input will reliably register as HIGH, and the device outputs 5 V logic levels, enabling clean 3.3 V-to-5 V up-translation without external components.
What happens to the output when OE is left floating on SN74AHCT1G125DCKT?
If OE is left floating, SN74AHCT1G125DCKT may enter an undefined state where the output Y oscillates or remains partially enabled, risking bus contention and excessive current draw. TI explicitly recommends tying OE to VCC via a pull-up resistor (e.g., 10 kΩ) to guarantee high-impedance startup behavior and prevent damage during power sequencing.
Is SN74AHCT1G125DCKT suitable for automotive applications?
No - SN74AHCT1G125DCKT is not qualified for automotive use. For AEC-Q100-compliant alternatives, TI offers the pin-compatible SN74AHCT1G125-Q1, which undergoes extended temperature stress testing (–40 °C to +125 °C), enhanced ESD robustness, and zero-defect manufacturing validation required for automotive ECUs and ADAS subsystems.
How does the 3-state disable timing of SN74AHCT1G125DCKT compare to its propagation delay?
SN74AHCT1G125DCKT disables Y within 8.5 ns (tPHZ max) after OE rises, and enables Y within 6.5 ns (tPZH max) after OE falls - both values measured at CL = 15 pF. These enable/disable times are comparable to its signal propagation delay (6 ns max), ensuring tight timing alignment in bus arbitration schemes where output gating must track data edges precisely.
SN74AHCT1G125DCKT 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:
- Obsolete
- 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
SN74AHCT1G125DCKT FAQ
1.How can I place an order for SN74AHCT1G125DCKT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT1G125DCKT 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 SN74AHCT1G125DCKT reliable?
The price and inventory of SN74AHCT1G125DCKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT1G125DCKT is usually 5 days.
3.What payment methods are accepted for SN74AHCT1G125DCKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT1G125DCKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHCT1G125DCKT?
SN74AHCT1G125DCKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT1G125DCKT 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 SN74AHCT1G125DCKT?
For technical support, including SN74AHCT1G125DCKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT1G125DCKT requirements.
6.How does Aetrix verify that SN74AHCT1G125DCKT is sourced from the original manufacturer or authorized distributors?
All SN74AHCT1G125DCKT 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 SN74AHCT1G125DCKT meets industry standards.
7.What is the process for return or replacement of SN74AHCT1G125DCKT?
All SN74AHCT1G125DCKT units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT1G125DCKT, 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 SN74AHCT1G125DCKT part is unused and in its original packaging.
Return procedure for SN74AHCT1G125DCKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74AHCT1G125DCKT Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
