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Texas Instruments 74AHCT1G125DBVRE4
- Part No.:
- 74AHCT1G125DBVRE4
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
74AHCT1G125DBVRE4.pdf
- Description:
- IC BUF NON-INVERT 5.5V SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,697
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Product details
Overview
74AHCT1G125DBVRE4 from Texas Instruments is a single-channel 3-state bus buffer gate designed for level translation and signal isolation in 5 V digital systems. It features TTL-compatible inputs, ±8 mA output drive at 5 V, 6 ns max propagation delay, and operates across 4.5 V–5.5 V supply with ≤10 µA quiescent current. It enables bidirectional bus control in PC motherboard I/O expansion and industrial PLC backplane interfaces.
For engineers reviewing the 74AHCT1G125DBVRE4 datasheet, 74AHCT1G125DBVRE4 pinout, 74AHCT1G125DBVRE4 application, or 74AHCT1G125DBVRE4 equivalent, this page delivers verified electrical specs, SOT-23-5 package details, functional mode behavior, real-world use cases, and two validated alternative parts - all extracted directly from TI's production-grade SCLS378P datasheet (March 2024 revision).
Technical Context
The 74AHCT1G125DBVRE4 implements a noninverting buffer with active-low 3-state output enable (OE), where Y = A when OE = L and Y = high-impedance when OE = H. Its TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V) support reliable interfacing with legacy 3.3 V logic while operating at 5 V supply.
It uses CMOS technology with balanced output drive and intentionally slow edge rates to suppress output ringing on lightly loaded buses. The device complies with JESD 17 latch-up immunity (>250 mA) and supports operation from –40°C to +125°C with thermal resistance RθJA = 278°C/W in the DBV package.
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 line regulation drift. |
| Max Propagation Delay | 6 ns at 5 V, CL = 15 pF - guarantees timing closure in high-speed control paths up to ~100 MHz clock domains. |
| Output Drive | ±8 mA at 5 V - sufficient to drive multiple 74-series inputs or short PCB traces without external buffering. |
| Input Compatibility | TTL voltage levels (VIH = 2.0 V, VIL = 0.8 V) - enables direct connection to 3.3 V microcontrollers and FPGAs without level shifters. |
| Quiescent Current | ≤10 µA - minimizes standby power in always-on industrial monitoring circuits. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive modules and industrial motor drives. |
| ESD Rating | HBM ±1000 V - meets basic handling requirements for automated assembly lines. |
Pinout & Package
SOT-23-5 (DBV) package: 2.9 mm × 2.8 mm footprint, 1.6 mm body width, 0.6 mm max height, gull-wing leads, JEDEC MO-178 compliant. RoHS-compliant, NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OE | Active-low output enable | Drives Y into high-impedance state when high; must be pulled to VCC via resistor during power-up to prevent bus contention. |
| 2 - A | Data input | Noninverting logic input accepting TTL-level signals; overvoltage tolerant up to 5.5 V regardless of VCC. |
| 3 - GND | Ground reference | Return path for all internal logic and output currents; requires low-inductance connection to system ground plane. |
| 4 - Y | 3-state output | Buffered replica of A when OE = L; presents >10⁶ Ω impedance when OE = H - isolates downstream loads electrically. |
| 5 - VCC | Power supply | 5 V nominal supply; requires local 0.1 µF ceramic bypass capacitor placed within 2 mm of pin for stable switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Enables direct interface with 3.3 V logic families (e.g., FPGA I/O banks) while powered from 5 V, eliminating discrete level shifters. |
| Controlled edge rates | Reduces output ringing and EMI on unterminated traces - critical for noise-sensitive test equipment and medical sensor interfaces. |
| High-impedance output state | Allows safe sharing of common data buses among multiple drivers without arbitration logic or external resistors. |
| Latch-up immunity | Exceeds 250 mA per JESD 17 - ensures robustness against transient faults in industrial power supply monitoring circuits. |
Applications
| Industrial PLC Backplanes | PC Motherboard I/O Expansion |
|---|---|
Use Scenario: Isolating configuration registers between CPU and peripheral modules on a modular PLC rack. IC Role / Device Role / Timing Role: Unidirectional buffer enabling read/write access to isolated I/O address space while preventing bus contention during hot-swap events. Use Value: 3-state control allows dynamic reconfiguration without halting main controller execution; ±8 mA drive sustains signal integrity across 10 cm backplane traces. | Use Scenario: Driving SMBus or LPC bus segments from southbridge to legacy Super I/O chips. IC Role / Device Role / Timing Role: Signal repeater and voltage translator ensuring timing-aligned communication between 3.3 V host logic and 5 V peripheral ICs. Use Value: 6 ns tPD meets SMBus 100 kHz timing budgets; TTL input thresholds guarantee reliable sampling of 3.3 V open-drain pull-ups. |
| Automotive Body Control Modules | Test & Measurement Equipment Interfaces |
Use Scenario: Enabling/disabling CAN transceiver standby mode control lines in BCM sub-assemblies. IC Role / Device Role / Timing Role: Logic-level shifter and enable gate for 5 V microcontroller GPIO controlling 3.3 V CAN FD PHY reset sequencing. Use Value: –40°C to +125°C rating supports under-dash mounting; low ICC reduces parasitic drain on vehicle battery during sleep mode. | Use Scenario: Buffering trigger and clock signals between FPGA-based pattern generator and DUT interface board. IC Role / Device Role / Timing Role: Signal conditioner that decouples FPGA output loading from sensitive analog stimulus circuitry. Use Value: High-impedance disable state eliminates crosstalk during calibration phases; slow edges suppress harmonic content above 100 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G125DBVR | Lower VCC range (1.65–5.5 V); higher drive (±32 mA); faster tPD (3.7 ns typ) | Supports dual-supply mixed-voltage systems; unsuitable where strict 5 V-only operation or lower EMI is required | Select for 3.3 V–5 V flexible designs needing higher fanout; verify layout for increased edge-induced noise. |
| 74AHC1G125SE-7 | Same 5 V operation; identical pinout; slightly higher ICC (20 µA max); same 6 ns tPD | Optimized for high-reliability industrial use; different MSL rating (Level-3 vs Level-1) | Prefer for long-lifecycle deployments requiring extended moisture sensitivity compliance; confirm reflow profile alignment. |
Compared with SN74LVC1G125DBVR and 74AHC1G125SE-7, the 74AHCT1G125DBVRE4 provides deterministic TTL-level compatibility and lower EMI at the cost of reduced drive strength and narrower supply margin - making it optimal for legacy 5 V bus isolation where signal integrity outweighs speed.
Availability
74AHCT1G125DBVRE4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, PC motherboard I/O expansion, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74AHCT1G125DBVRE4 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 90 years of innovation in industrial, automotive, and communications markets.
The SN74AHCT logic family targets 5 V systems requiring TTL-compatible interfacing, low power, and robust noise immunity - specifically engineered for bus buffering, level translation, and signal isolation in mission-critical infrastructure.
FAQ
What is the function of pin 1 (OE) on the 74AHCT1G125DBVRE4?
Pin 1 is the active-low output enable (OE) input. When OE is low, the device passes the A input signal to the Y output. When OE is high, Y enters a high-impedance (Hi-Z) state, effectively disconnecting the output from the bus. To ensure Hi-Z during power-up, TI recommends tying OE to VCC via a pullup resistor - minimum value determined by the driver's sink capability.
Does the 74AHCT1G125DBVRE4 support 3.3 V input signals while operating at 5 V supply?
Yes. The 74AHCT1G125DBVRE4 has TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V), allowing reliable recognition of 3.3 V logic levels when powered from 5 V. Inputs are overvoltage tolerant up to 5.5 V, making it suitable for translating signals from 3.3 V microcontrollers or FPGAs into 5 V bus domains without external level shifters.
What is the maximum output current rating for the 74AHCT1G125DBVRE4?
The 74AHCT1G125DBVRE4 supports ±8 mA output current per IOL/IOH specification at 5 V supply. Absolute maximum ratings allow ±25 mA continuous output current and ±50 mA total channel current through VCC or GND. Exceeding ±8 mA may degrade VOH/VOL performance but remains within safe operating limits per datasheet Section 5.1.
Can the 74AHCT1G125DBVRE4 be used in automotive applications?
The commercial-grade 74AHCT1G125DBVRE4 is rated for –40°C to +125°C and meets JESD 17 latch-up immunity, supporting under-hood and cabin applications. For AEC-Q100 qualified use, TI offers the automotive variant SN74AHCT1G125-Q1 - which undergoes additional stress testing and PPAP documentation. Use 74AHCT1G125DBVRE4 only where full automotive qualification is not mandated.
What package type does the 74AHCT1G125DBVRE4 use, and what are its key mechanical dimensions?
The 74AHCT1G125DBVRE4 uses the SOT-23-5 (DBV) package: 2.9 mm × 2.8 mm overall footprint, 2.9 mm × 1.6 mm body size, 0.6 mm maximum height, gull-wing leads, and JEDEC MO-178 compliant. It features NIPDAU lead finish, MSL Level-1 rating, and RoHS compliance - optimized for high-density PCB layouts and automated surface-mount assembly.
74AHCT1G125DBVRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- SOT-23-5
74AHCT1G125DBVRE4 FAQ
1.How can I place an order for 74AHCT1G125DBVRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT1G125DBVRE4 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 74AHCT1G125DBVRE4 reliable?
The price and inventory of 74AHCT1G125DBVRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT1G125DBVRE4 is usually 5 days.
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74AHCT1G125DBVRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT1G125DBVRE4 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 74AHCT1G125DBVRE4?
For technical support, including 74AHCT1G125DBVRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT1G125DBVRE4 requirements.
6.How does Aetrix verify that 74AHCT1G125DBVRE4 is sourced from the original manufacturer or authorized distributors?
All 74AHCT1G125DBVRE4 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 74AHCT1G125DBVRE4 meets industry standards.
7.What is the process for return or replacement of 74AHCT1G125DBVRE4?
All 74AHCT1G125DBVRE4 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT1G125DBVRE4, 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 74AHCT1G125DBVRE4 part is unused and in its original packaging.
Return procedure for 74AHCT1G125DBVRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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