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Texas Instruments 74AHCT1G125DRLRG4
- Part No.:
- 74AHCT1G125DRLRG4
- Manufacturer:
- Texas Instruments
- Package:
- SOT-553
- Datasheet:
-
74AHCT1G125DRLRG4.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V SOT5
- Quantity:
- Payment:
- Shipping:
Inventory:4,651
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Product details
Overview
74AHCT1G125DRLRG4 from Texas Instruments is a single 3-state bus buffer gate designed for level translation and signal isolation in 5V digital systems. It features TTL-compatible inputs, ±8mA output drive at 5V, 6ns max propagation delay, 10µA max supply current, and operates across –40°C to 125°C. It enables controlled data routing in compact embedded interfaces where space and power efficiency are critical.
For engineers reviewing the 74AHCT1G125DRLRG4 datasheet, 74AHCT1G125DRLRG4 pinout, 74AHCT1G125DRLRG4 application, or 74AHCT1G125DRLRG4 equivalent, this page delivers verified electrical specs, SOT-553 package details, functional mode behavior, real-world use cases in industrial control and computing, and two validated alternative parts with documented differences.
Technical Context
The 74AHCT1G125DRLRG4 implements a noninverting buffer with active-low 3-state output enable (OE), enabling bidirectional bus control when used in arrays. Its TTL-compatible input thresholds (VIH = 2V, VIL = 0.8V) support reliable interfacing between 3.3V logic and 5V buses without external level shifters.
It uses advanced CMOS technology with slow edge-rate control to suppress output ringing-critical in high-speed PCB traces with light capacitive loads. The device enters high-impedance state when OE is high, isolating Y from A, and passes A→Y when OE is low, with guaranteed tPLH/tPHL ≤7ns at 125°C and CL = 15pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V–5.5V - Ensures compatibility with standard 5V rail tolerances and avoids undervoltage lockout in noisy environments. |
| Max Propagation Delay | 7ns at VCC = 5V, TA = 125°C, CL = 15pF - Guarantees timing margin for 100+ MHz clock domains in industrial PLCs and server backplanes. |
| Output Drive Strength | ±8mA at 5V - Sufficient to drive four standard TTL loads or terminate short stubs on multi-drop buses without external buffers. |
| Input Compatibility | TTL-voltage compatible (VIH = 2V, VIL = 0.8V) - Enables direct connection to legacy 3.3V microcontrollers or FPGAs without level-shifting circuitry. |
| Quiescent Supply Current | 10µA max - Supports ultra-low-power standby modes in battery-backed instrumentation and remote sensors. |
| Operating Temperature | –40°C to +125°C - Qualified for under-hood automotive modules, industrial motor drives, and telecom infrastructure equipment. |
| ESD Rating | ±1500V CDM - Meets JEDEC JESD22-C101 for robust handling during automated assembly and field service. |
Pinout & Package
SOT-553 (DRL) 5-pin plastic small outline package: 1.6mm × 1.6mm body size, 0.6mm max height, lead pitch 0.5mm. Optimized for high-density PCB layouts in space-constrained applications including portable test gear and modular I/O cards.
| 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 via resistor during power-up to prevent bus contention. |
| 2 (A) | Data input | Accepts TTL-level signals; internally clamped to withstand overvoltage up to 5.5V regardless of VCC. |
| 3 (GND) | Ground reference | Primary return path for all internal logic and output currents; requires low-inductance connection to system ground plane. |
| 4 (Y) | 3-state buffered output | Noninverting replica of A when OE is low; presents >10⁹Ω impedance when OE is high-enables true bus sharing. |
| 5 (VCC) | Positive supply | Must be bypassed with 0.1µF ceramic capacitor placed ≤2mm from pin to suppress switching noise and maintain stable logic thresholds. |
Key Features
| Feature | Design Value |
|---|---|
| Slow edge-rate control | Reduces output ringing and EMI in unterminated transmission lines-eliminates need for series termination resistors in many 5V bus designs. |
| TTL-input voltage thresholds | Enables seamless 3.3V-to-5V up-translation without external biasing or level shifters, simplifying mixed-voltage system integration. |
| High-impedance state leakage | ±2.5µA max IOZ at 125°C ensures minimal bus leakage current during disable-critical for maintaining signal integrity in hot-swappable modules. |
| Latch-up immunity | Exceeds 250mA per JESD17-prevents destructive latch-up during transient overvoltage events in industrial power supply monitoring circuits. |
Applications
| Industrial Programmable Logic Controllers | Server Backplane Signal Isolation |
|---|---|
Use Scenario: Isolating I/O expansion slots from main CPU bus to prevent fault propagation during hot-swap operations. IC Role / Device Role / Timing Role: 3-state buffer controlling data flow direction and enabling/disabling peripheral access under firmware control. Use Value: Prevents bus contention during module insertion/removal while maintaining <7ns timing alignment across 5V address/data lines. |
Use Scenario: Driving differential clock distribution networks from single-ended sources in rack-mounted servers. IC Role / Device Role / Timing Role: Level-translating and buffering clock-enable signals between 3.3V management ASICs and 5V clock fanout ICs. Use Value: Eliminates need for discrete resistor dividers or dedicated level translators-reducing BOM count and layout area by 30%. |
| Portable Test & Measurement Equipment | Automotive Body Control Modules |
Use Scenario: Multiplexing sensor calibration signals onto shared analog front-end ADC channels in handheld multimeters. IC Role / Device Role / Timing Role: Enabling/disabling analog switch control lines using low-power 3-state gating synchronized to measurement cycles. Use Value: Achieves 10µA quiescent current in sleep mode-extending battery life beyond 100 hours per charge. |
Use Scenario: Interfacing 3.3V CAN controller outputs to 5V lamp driver ICs in vehicle lighting subsystems. IC Role / Device Role / Timing Role: Translating and buffering PWM dimming commands while suppressing EMI from long harness runs. Use Value: Slow-edge design reduces radiated emissions below CISPR 25 Class 5 limits without added ferrites or shielding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT1G125DCKRG4 | SC-70 (DCK) package: 2.0mm × 2.1mm body, higher RθJA (289.2°C/W) vs DRL's 328.7°C/W. | Better thermal performance in airflow-limited enclosures due to lower junction-to-board resistance (176.2°C/W vs DRL's 150.3°C/W). | Select DCKRG4 when board layout allows larger footprint and thermal relief via PCB copper pour is limited. |
| 74LVC1G125GW,125 | Lower VCC range (1.65–5.5V); 3.3V-optimized; max tpd = 3.7ns at 3.3V but degrades to 6.5ns at 5V. | Superior performance in mixed-voltage 3.3V/5V systems with dynamic voltage scaling; not rated for full –40°C to 125°C at 5V. | Choose LVC1G125 for cost-sensitive consumer electronics where extended temperature range is not required. |
Compared with SN74AHCT1G125DCKRG4, the 74AHCT1G125DRLRG4 offers 22% smaller footprint and better high-temp stability above 85°C; versus 74LVC1G125GW,125, it guarantees full 5V operation across automotive-grade temperature extremes but trades off 3.3V speed optimization.
Availability
74AHCT1G125DRLRG4 is available at Aetrix Electronics and suitable for industrial programmable logic controllers, server backplane signal isolation, and portable test & measurement equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74AHCT1G125DRLRG4 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 family delivers TTL-compatible 5V logic with CMOS power efficiency-designed specifically for robust signal integrity in noise-prone industrial control, telecom infrastructure, and computing backplanes.
FAQ
What is the maximum operating temperature for the 74AHCT1G125DRLRG4?
The 74AHCT1G125DRLRG4 is fully specified from –40°C to +125°C ambient temperature. This rating is validated per TI's production test flow and applies across all electrical parameters including propagation delay, output drive, and leakage current-making it suitable for under-hood automotive modules and industrial motor drives where thermal margins are critical. The SOT-553 package's thermal metrics support this range with RθJB = 150.3°C/W.
Does the 74AHCT1G125DRLRG4 require external pull-up resistors on the OE pin?
Yes-the 74AHCT1G125DRLRG4 OE pin has no internal pull-up. To ensure the output remains in high-impedance state during power-up or brownout, TI recommends connecting OE to VCC through an external pull-up resistor. The minimum value depends on the driving source's sink capability; for typical microcontroller GPIOs, 10kΩ is sufficient. This prevents unintended bus contention before firmware initializes the pin.
Can the 74AHCT1G125DRLRG4 interface directly with 3.3V logic inputs?
Yes-the 74AHCT1G125DRLRG4 features TTL-compatible input thresholds (VIH = 2.0V min, VIL = 0.8V max), allowing direct connection to 3.3V CMOS or LVTTL outputs without level-shifting circuitry. Its inputs tolerate voltages up to 5.5V regardless of VCC, enabling safe interfacing even when driven by higher-voltage sources in mixed-rail systems.
What is the output drive capability of the 74AHCT1G125DRLRG4 at 5V?
At VCC = 5V, the 74AHCT1G125DRLRG4 delivers ±8mA output current-verified across –40°C to +125°C. This supports driving four standard TTL loads (each ~2mA) or terminating short PCB traces (<5cm) with 50Ω impedance. Exceeding ±25mA per output risks violating absolute maximum ratings and may trigger latch-up per JESD17 testing.
Is the 74AHCT1G125DRLRG4 RoHS compliant and lead-free?
Yes-the 74AHCT1G125DRLRG4 is RoHS compliant and features NiPdAu (NIPDAUAG) lead finish per TI's packaging documentation. It meets JEDEC MSL Level-1 (260°C peak reflow, unlimited floor life) and is qualified for lead-free soldering processes. Full compliance documentation-including substance declarations and test reports-is available via TI's Quality & Environmental Information portal.
74AHCT1G125DRLRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- SOT-553
- 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-5
74AHCT1G125DRLRG4 FAQ
1.How can I place an order for 74AHCT1G125DRLRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT1G125DRLRG4 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 74AHCT1G125DRLRG4 reliable?
The price and inventory of 74AHCT1G125DRLRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT1G125DRLRG4 is usually 5 days.
3.What payment methods are accepted for 74AHCT1G125DRLRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT1G125DRLRG4 transactions.
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4.How is shipping managed for 74AHCT1G125DRLRG4?
74AHCT1G125DRLRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT1G125DRLRG4 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 74AHCT1G125DRLRG4?
For technical support, including 74AHCT1G125DRLRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT1G125DRLRG4 requirements.
6.How does Aetrix verify that 74AHCT1G125DRLRG4 is sourced from the original manufacturer or authorized distributors?
All 74AHCT1G125DRLRG4 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 74AHCT1G125DRLRG4 meets industry standards.
7.What is the process for return or replacement of 74AHCT1G125DRLRG4?
All 74AHCT1G125DRLRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT1G125DRLRG4, 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 74AHCT1G125DRLRG4 part is unused and in its original packaging.
Return procedure for 74AHCT1G125DRLRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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