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Texas Instruments SN74AHCT1G125DBVT
- Part No.:
- SN74AHCT1G125DBVT
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SN74AHCT1G125DBVT.pdf
- Description:
- IC BUF NON-INVERT 5.5V SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:7,658
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Product details
Overview
SN74AHCT1G125 from Texas Instruments is a single-channel 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 quiescent supply current. It serves as an enable-controlled unidirectional signal isolator in high-density logic interfaces such as server memory buffers and programmable logic controller I/O expansion.
For engineers reviewing the SN74AHCT1G125 datasheet, SN74AHCT1G125 pinout, SN74AHCT1G125 application, or SN74AHCT1G125 equivalent, key selection criteria include its 5-pin SOT-23 (DBV) package, 3-state output control timing (tPZH/tPHZ ≤ 8.5 ns), input voltage compatibility with 3.3 V logic, and thermal resistance (RθJA = 278 °C/W) for compact industrial PCB layouts.
Technical Context
The SN74AHCT1G125 implements a noninverting buffer with active-low 3-state output enable (OE), where Y follows A when OE = L and enters high-impedance when OE = H. Its TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V) support mixed-voltage translation from 3.3 V to 5 V systems without level shifters.
Designed for low-noise operation, it features slow edge rates (Δt/Δv ≤ 20 ns/V) to suppress output ringing on unterminated traces, and includes latch-up immunity exceeding 250 mA per JESD17 - critical for robustness in power infrastructure and test equipment environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V logic rails and tolerance against supply droop in servers and PLCs. |
| Propagation Delay | ≤6 ns at 5 V, CL = 15 pF - enables reliable timing in sub-100 MHz digital control paths without added skew. |
| Output Drive | ±8 mA at 5 V - sufficient to drive multiple CMOS inputs or short PCB traces while limiting EMI. |
| Input Compatibility | TTL-level (VIH = 2.0 V, VIL = 0.8 V) - allows direct interfacing with legacy 3.3 V microcontrollers and FPGAs without external biasing. |
| Quiescent Current | ≤10 µA - supports low-power standby modes in battery-backed instrumentation and wireless infrastructure baseband modules. |
| Operating Temperature | –40 °C to +125 °C - qualified for extended industrial and automotive under-hood applications. |
Pinout & Package
SOT-23 (DBV) 5-pin plastic package: 2.9 mm × 2.8 mm footprint, 1.6 mm body height, gull-wing leads, JEDEC MO-178 compliant. Designed for reflow soldering with MSL Level-1 rating (260 °C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OE | Active-low output enable input | Drives Y into high-impedance when high; must be pulled up to VCC during power-up to prevent bus contention. |
| 2 - A | Buffer input | Accepts TTL-compatible signals; no internal pull-up/down; requires external bias if unused. |
| 3 - GND | Ground reference | Primary return path for logic and output currents; must be connected to low-impedance system ground plane. |
| 4 - Y | 3-state buffered output | Noninverting replica of A when OE = L; presents >10⁶ Ω impedance when OE = H per datasheet ICC(OFF) ≤ 2.5 µA. |
| 5 - VCC | Power supply | Requires local 0.1 µF ceramic bypass capacitor placed within 2 mm of pin to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Slow-edge rate control | Δt/Δv ≤ 20 ns/V minimizes overshoot/undershoot on unterminated 50 Ω traces - eliminates need for series termination in space-constrained PCBs. |
| TTL-input voltage thresholds | VIL = 0.8 V / VIH = 2.0 V enables direct connection to 3.3 V logic families without level-shifting circuitry in mixed-voltage backplanes. |
| High-impedance leakage | IOZ ≤ ±2.5 µA over –40 °C to +125 °C ensures minimal bus loading during 3-state hold - critical for shared memory/data buses. |
| Latch-up immunity | Exceeds 250 mA per JESD17 - prevents destructive latch-up during hot-swap events or transient overvoltage in power infrastructure monitoring circuits. |
Applications
| Server Memory Buffering | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Isolating address/data lines between FPGA-based control logic and DDR3 memory modules in 1U rack servers. IC Role / Device Role / Timing Role: Unidirectional 3-state buffer enabling time-multiplexed access to shared memory bus while preventing contention during refresh cycles. Use Value: 6 ns tPLH/tPHL ensures setup/hold margin for 100 MHz clock domains; ±8 mA drive sustains signal integrity across 4-inch FR4 traces. | Use Scenario: Expanding digital input channels on modular PLC backplanes using isolated 24 V sensor signals converted to 5 V logic levels. IC Role / Device Role / Timing Role: Signal conditioning interface between optocoupler-isolated field inputs and main CPU bus, controlled via FPGA-configurable OE. Use Value: –40 °C to +125 °C rating supports operation inside sealed control cabinets; TTL compatibility eliminates external resistor dividers. |
| Wireless Baseband Timing | Test Equipment Digital Pattern Generation |
Use Scenario: Routing synchronized clock and data signals between RF transceiver ICs and baseband processors in small-cell BTS units. IC Role / Device Role / Timing Role: Glitch-free bus isolation gate enabling dynamic reconfiguration of signal paths during mode switching (e.g., TDD/FDD transitions). Use Value: Low 10 µA ICC enables always-on monitoring circuits; slow edges reduce radiated emissions below FCC Class B limits. | Use Scenario: Driving high-speed digital stimulus waveforms from pattern generators into DUTs with variable load capacitance (10–50 pF). IC Role / Device Role / Timing Role: Output stage buffer providing consistent edge control and defined drive strength independent of DUT input impedance variations. Use Value: CL = 15 pF / 50 pF switching specs validated across temperature - ensures waveform fidelity repeatability in automated test systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G125DBVT | Lower VCC range (1.65–5.5 V); higher speed (tPD = 3.7 ns @ 3.3 V); CMOS input thresholds (VIH = 2.0 V @ VCC = 3.3 V) | Better suited for dual-supply 3.3 V/5 V systems; less tolerant of noisy 5 V rails due to lower noise margin | Select when operating below 4.5 V or requiring faster timing; verify input noise immunity in electrically harsh environments. |
| 74AHC1G125SE-7 | Same 5 V operation; slightly higher ICC (20 µA max); identical pinout and function; Diodes Inc. SOT-23-5 package | Validated for automotive AEC-Q100 Grade 3 (–40 °C to +85 °C); not rated to +125 °C | Prefer for cost-sensitive industrial designs where full temperature range is not required; confirm MSL and reflow profile compatibility. |
Compared with SN74AHCT1G125, SN74LVC1G125DBVT offers wider voltage flexibility but reduced noise immunity at 5 V, while 74AHC1G125SE-7 provides drop-in sourcing with relaxed temperature grading - making SN74AHCT1G125 the optimal choice for high-reliability 5 V-only applications demanding full industrial temperature coverage and proven latch-up resilience.
Availability
SN74AHCT1G125DBVT is available at Aetrix Electronics and suitable for server motherboard design, industrial PLC I/O modules, and wireless infrastructure baseband boards requiring stable component supply across long production lifecycles.
Supply support for SN74AHCT1G125DBVT 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 interface and signal-path components.
The SN74AHCT1G125 belongs to TI's advanced high-speed CMOS logic family, engineered specifically for robust 5 V bus interfacing in industrial automation, communications infrastructure, and computing systems where noise immunity and thermal stability are critical.
FAQ
What is the maximum recommended load capacitance for stable operation of the SN74AHCT1G125DBVT?
The SN74AHCT1G125DBVT is characterized for CL = 15 pF and CL = 50 pF loads per the datasheet switching characteristics table. At 50 pF, tPLH/tPHL increases to ≤9.5 ns, and tPZH/tPHZ reaches ≤11 ns - all within guaranteed spec. Exceeding 50 pF may degrade timing margins and increase ringing; for >50 pF loads, consider adding series termination or selecting a higher-drive buffer. The SN74AHCT1G125DBVT's specified Co = 10 pF confirms internal output node capacitance is low, supporting clean edge control.
Can the SN74AHCT1G125DBVT operate reliably with a 3.3 V input signal while powered at 5 V?
Yes - the SN74AHCT1G125DBVT features TTL-compatible inputs with VIH = 2.0 V (min) and VIL = 0.8 V (max) at VCC = 5 V, making it fully compatible with 3.3 V logic outputs. Its input structure tolerates voltages up to 5.5 V regardless of VCC, so 3.3 V signals drive the A input correctly without level shifting. This capability is explicitly leveraged in TI's typical application for 3.3 V-to-5 V translation, confirmed in Figure 8-2 of the SN74AHCT1G125DBVT datasheet.
Is the SN74AHCT1G125DBVT pin-compatible with other 5-pin SOT-23 logic gates like the SN74AHCT1G00 or SN74AHCT1G08?
No - while all share the SOT-23-5 (DBV) package, the SN74AHCT1G125DBVT has a unique pinout: Pin 1 = OE, Pin 2 = A, Pin 3 = GND, Pin 4 = Y, Pin 5 = VCC. In contrast, SN74AHCT1G00 (dual-input NAND) uses Pin 1 = A, Pin 2 = B, Pin 3 = Y, Pin 4 = GND, Pin 5 = VCC - no OE pin. Substituting them requires PCB redesign. Always verify pin functions using Table 4-1 in the SN74AHCT1G125DBVT datasheet before layout reuse.
What is the thermal performance of the SN74AHCT1G125DBVT in its SOT-23 package?
The SN74AHCT1G125DBVT in DBV package has RθJA = 278 °C/W (junction-to-ambient, still air), RθJB = 184.4 °C/W (junction-to-board), and ψJB = 183.4 °C/W per Section 5.4 of the datasheet. With typical ICC ≤ 10 µA and I/O currents ≤ 8 mA, power dissipation stays below 45 mW - resulting in <13 °C junction rise above ambient at 25 °C. This enables use in thermally constrained spaces like dense server DIMM slots without forced airflow.
Does the SN74AHCT1G125DBVT require external pull-up resistors on the OE pin?
Yes - to ensure the output remains in high-impedance state during power-up/power-down, TI recommends tying OE to VCC via a pull-up resistor. The minimum value depends on the driver's sink capability; for standard microcontroller GPIOs (≥20 mA sink), a 10 kΩ resistor suffices. This prevents bus contention before firmware initializes OE control. The SN74AHCT1G125DBVT's functional description in Section 7.1 explicitly states this requirement to guarantee safe power sequencing in systems with asynchronous reset behavior.
SN74AHCT1G125DBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- SC-74A, SOT-753
- 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:
- SOT-23-5
SN74AHCT1G125DBVT FAQ
1.How can I place an order for SN74AHCT1G125DBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT1G125DBVT 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 SN74AHCT1G125DBVT reliable?
The price and inventory of SN74AHCT1G125DBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT1G125DBVT is usually 5 days.
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Once your SN74AHCT1G125DBVT 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 SN74AHCT1G125DBVT?
For technical support, including SN74AHCT1G125DBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT1G125DBVT requirements.
6.How does Aetrix verify that SN74AHCT1G125DBVT is sourced from the original manufacturer or authorized distributors?
All SN74AHCT1G125DBVT 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 SN74AHCT1G125DBVT meets industry standards.
7.What is the process for return or replacement of SN74AHCT1G125DBVT?
All SN74AHCT1G125DBVT units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT1G125DBVT, 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 SN74AHCT1G125DBVT part is unused and in its original packaging.
Return procedure for SN74AHCT1G125DBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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