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Texas Instruments 74AHCT1G125DBVTG4
- Part No.:
- 74AHCT1G125DBVTG4
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
74AHCT1G125DBVTG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,105
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Product details
Overview
74AHCT1G125DBVTG4 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 max propagation delay at 5 V, ±8 mA output drive, and 10 µA max supply current. It functions as a unidirectional level-translating line driver in 5 V digital bus isolation and enable-controlled data routing.
For engineers reviewing the 74AHCT1G125DBVTG4 datasheet, 74AHCT1G125DBVTG4 pinout, 74AHCT1G125DBVTG4 application, or 74AHCT1G125DBVTG4 equivalent, this page delivers verified package mapping (SOT-23-5), functional truth table, switching characteristics under 15 pF/50 pF loads, thermal resistance (RθJA = 278 °C/W), and validated alternatives for 3-state buffer replacement in industrial control and server I/O subsystems.
Technical Context
The 74AHCT1G125DBVTG4 implements a noninverting 3-state buffer with active-low output-enable (OE) control: when OE = L, A passes to Y; when OE = H, Y enters high-impedance state. Its TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V) support reliable 3.3 V-to-5 V up-translation without external biasing.
Designed for low-noise bus interfacing, it features slow edge rates (20 ns/V input transition rate limit) to suppress output ringing, and latch-up immunity exceeding 250 mA per JESD17. All unused inputs must be tied to VCC or GND to prevent floating states and undefined operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V logic rails and tolerates supply ripple without functional degradation. |
| tpd Max | 6 ns at 5 V, CL = 15 pF - Guarantees sub-10 ns timing margin for high-speed 5 V bus handshaking in servers and PLCs. |
| IOH/IOL | ±8 mA at 5 V - Supports direct driving of multiple CMOS/TTL loads without external buffering in point-to-point interfaces. |
| VIH/VIL | 2.0 V / 0.8 V - Enables robust recognition of 3.3 V logic levels as valid HIGH/LOW, enabling seamless 3.3 V → 5 V level translation. |
| ICC Max | 10 µA at 5.5 V - Minimizes quiescent power in always-on control logic, critical for thermally constrained embedded modules. |
| IOZ Max | ±2.5 µA at –40°C to 125°C - Confirms stable high-impedance state across full industrial temperature range, preventing bus leakage. |
| RθJA | 278 °C/W (DBV package) - Defines thermal derating limit for continuous operation at ambient temperatures up to 125°C with no forced airflow. |
Pinout & Package
SOT-23-5 (DBV) package: 2.9 mm × 2.8 mm footprint, 1.6 mm body height, lead pitch 0.95 mm, RoHS-compliant NiPdAu finish, MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OE | Active-low 3-state enable input | Drives Y to high-Z when high; ties to VCC via pullup for power-up safety to avoid bus contention. |
| 2 - A | Buffer input | Accepts TTL-voltage signals (0.8 V/2.0 V thresholds); tolerant to 5.5 V regardless of VCC. |
| 3 - GND | Ground reference | Common return path for all internal circuitry; requires low-inductance connection to minimize ground bounce. |
| 4 - Y | 3-state noninverting output | Drives bus only when OE = L; exhibits ±8 mA drive strength and 0.36 V VOL at 8 mA load. |
| 5 - VCC | Power supply | Must be bypassed with 0.1 µF ceramic capacitor placed within 2 mm of pin to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Enables direct interface with legacy 3.3 V microcontrollers and FPGAs without level-shifter ICs or resistive dividers. |
| Slow edge rate control | 20 ns/V input transition specification limits dV/dt to reduce EMI and eliminate overshoot on unterminated PCB traces. |
| High-impedance output state | IOZ ≤ ±2.5 µA over –40°C to 125°C ensures negligible leakage into shared buses during disable, preserving signal integrity. |
| Latch-up immunity | Exceeds 250 mA per JESD17 - prevents destructive latch-up during hot-swap or transient overvoltage events in industrial backplanes. |
| Industrial temperature range | Rated for –40°C to +125°C operation - supports deployment in fanless servers, outdoor telecom gear, and motor control enclosures. |
Applications
| Industrial Programmable Logic Controllers | Server Baseboard Management Controllers |
|---|---|
Use Scenario: Isolating sensor input lines and actuator command buses in modular I/O racks with shared backplane wiring. IC Role / Device Role / Timing Role: 3-state buffer enabling time-multiplexed access to analog-to-digital converter channels and relay driver banks. Use Value: Prevents bus contention during firmware updates by disabling outputs while configuration registers are rewritten. |
Use Scenario: Routing SMBus/I²C signals between BMC, CPU VRMs, and thermal sensors in dense 1U server chassis. IC Role / Device Role / Timing Role: Unidirectional level translator and bus isolator for 3.3 V BMC logic communicating with 5 V power monitoring ICs. Use Value: Eliminates need for dual-supply translators; TTL input thresholds ensure reliable detection of 3.3 V SMBus pulses at 100 kHz. |
| Wireless Base Station Remote Radio Units | Test & Measurement Equipment Front-End Interfaces |
Use Scenario: Enabling/disabling RF calibration data paths between FPGA and ADC/DAC in compact RRUs with strict EMI limits. IC Role / Device Role / Timing Role: Controlled bus gate synchronizing calibration sample bursts with RF power amplifier enable timing. Use Value: Slow edge rates suppress harmonic emissions above 1 GHz, easing FCC Part 22 compliance testing. |
Use Scenario: Selectively connecting DUT signals to oscilloscope trigger inputs or logic analyzer channels in automated test fixtures. IC Role / Device Role / Timing Role: Manual or microcontroller-controlled signal routing switch with guaranteed 6 ns timing resolution. Use Value: 10 µA ICC enables battery-powered portable testers to maintain >100-hour runtime during standby mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G125DBVR | Lower VCC range (1.65–5.5 V); 3.3 V optimized; 3.7 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 EMI in noise-sensitive RF sections | Select when interfacing with 3.3 V FPGAs or when tighter timing margins are required below 3.3 V operation. |
| 74AHC1G125SE-7 | Same 4.5–5.5 V range; 5.5 ns tpd; ±8 mA drive; SOT-353 (SC-70-5) package (2.0 × 2.1 mm) | Smaller footprint but higher RθJA (289.2 °C/W); identical function and pinout, not pin-compatible due to different pad layout | Choose for space-constrained designs where 0.9 mm² area reduction outweighs thermal derating trade-off. |
Compared with SN74LVC1G125DBVR and 74AHC1G125SE-7, the 74AHCT1G125DBVTG4 provides deterministic TTL-level recognition at 5 V with industry-standard SOT-23-5 thermal performance-making it optimal for legacy 5 V industrial bus architectures requiring proven reliability over 25+ years of field use.
Availability
74AHCT1G125DBVTG4 is available at Aetrix Electronics and suitable for industrial programmable logic controllers, server baseboard management subsystems, and wireless infrastructure remote radio units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74AHCT1G125DBVTG4 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 SN74AHCT logic family delivers TTL-compatible 5 V CMOS buffers, gates, and transceivers engineered for interoperability with legacy 3.3 V/5 V systems and robust operation in harsh electromagnetic environments.
FAQ
What is the maximum operating temperature for the 74AHCT1G125DBVTG4?
The 74AHCT1G125DBVTG4 is rated for continuous operation from –40°C to +125°C ambient temperature. This industrial-grade rating is validated per JEDEC JESD22-A108 and confirmed in Section 5.3 of the official datasheet. Thermal derating applies above 85°C based on RθJA = 278 °C/W; the 74AHCT1G125DBVTG4 maintains full electrical specifications across the entire range when properly heatsinked or airflow-cooled.
Does the 74AHCT1G125DBVTG4 support 3.3 V input signals?
Yes, the 74AHCT1G125DBVTG4 explicitly supports 3.3 V logic inputs due to its TTL-compatible input thresholds: VIL = 0.8 V (max) and VIH = 2.0 V (min). When powered at 5 V, it reliably interprets 3.3 V HIGH signals as valid logic HIGH and 0 V as LOW-enabling direct 3.3 V-to-5 V level translation without external components. This behavior is documented in Section 5.3 and Figure 8-2 of the TI datasheet.
What is the recommended bypass capacitor for the 74AHCT1G125DBVTG4?
Texas Instruments recommends a 0.1 µF ceramic capacitor placed as close as possible (<2 mm) to the VCC pin (Pin 5) of the 74AHCT1G125DBVTG4. This value is specified in Section 8.3 of the datasheet to suppress high-frequency switching noise and stabilize the supply during output transitions. For multi-device layouts, parallel 0.1 µF + 1 µF capacitors are acceptable to cover broader noise spectra, but the 0.1 µF unit remains mandatory for each 74AHCT1G125DBVTG4 instance.
Is the 74AHCT1G125DBVTG4 pin-compatible with other SOT-23-5 logic buffers?
No-the 74AHCT1G125DBVTG4 has a fixed pinout (OE/A/GND/Y/VCC) defined in Table 4-1 of the datasheet, but it is not universally pin-compatible with all SOT-23-5 buffers. For example, SN74LVC1G125DBVR shares identical pin assignment, while SN74AUP1G125DBVR uses different pin ordering. Always verify pin functions-not just package-before substitution; the 74AHCT1G125DBVTG4 pinout is validated and shown in the Pinout & Package section above.
What happens if the OE pin of the 74AHCT1G125DBVTG4 is left floating?
If OE is left floating, the 74AHCT1G125DBVTG4 may enter an indeterminate state where Y oscillates or sources unintended current, risking bus contention and excessive ICC. Section 7.1 mandates tying OE to VCC via a pullup resistor during power-up/down. The minimum resistor value depends on the driver's sink capability; TI recommends 10 kΩ for most applications. This requirement is critical for system reliability and is explicitly stated in the Functional Description and Layout Guidelines.
74AHCT1G125DBVTG4 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
74AHCT1G125DBVTG4 FAQ
1.How can I place an order for 74AHCT1G125DBVTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT1G125DBVTG4 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 74AHCT1G125DBVTG4 reliable?
The price and inventory of 74AHCT1G125DBVTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT1G125DBVTG4 is usually 5 days.
3.What payment methods are accepted for 74AHCT1G125DBVTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT1G125DBVTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHCT1G125DBVTG4?
74AHCT1G125DBVTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT1G125DBVTG4 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 74AHCT1G125DBVTG4?
For technical support, including 74AHCT1G125DBVTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT1G125DBVTG4 requirements.
6.How does Aetrix verify that 74AHCT1G125DBVTG4 is sourced from the original manufacturer or authorized distributors?
All 74AHCT1G125DBVTG4 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 74AHCT1G125DBVTG4 meets industry standards.
7.What is the process for return or replacement of 74AHCT1G125DBVTG4?
All 74AHCT1G125DBVTG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT1G125DBVTG4, 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 74AHCT1G125DBVTG4 part is unused and in its original packaging.
Return procedure for 74AHCT1G125DBVTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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