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Texas Instruments 74AHC1G125DCKRG4
- Part No.:
- 74AHC1G125DCKRG4
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
74AHC1G125DCKRG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,818
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Product details
Overview
74AHC1G125DCKRG4 from Texas Instruments is a single 3-state bus buffer gate used for signal isolation and bidirectional bus control in low-power digital systems. It operates from 2 V to 5.5 V, delivers ±8 mA output drive at 5 V, achieves 6 ns max propagation delay (tpd) at 5 V, and consumes ≤10 µA supply current (ICC). It serves in TV video signal routing, server board-level interconnects, and motor control logic interface circuits.
For engineers reviewing the 74AHC1G125DCKRG4 datasheet, 74AHC1G125DCKRG4 pinout, 74AHC1G125DCKRG4 application, or 74AHC1G125DCKRG4 equivalent, this page provides verified electrical specs, SC-70 package details, functional mode behavior, real-world use cases, and validated alternative parts - all grounded in TI's SCLS377M production data sheet (Feb 2024).
Technical Context
The 74AHC1G125DCKRG4 implements a noninverting CMOS buffer with active-low 3-state enable (OE), where Y = A when OE = L and Y = high-impedance when OE = H. Its input structure accepts voltages up to 5.5 V regardless of VCC, enabling down-translation from 5 V logic to lower-voltage domains.
It features balanced rise/fall times, low dynamic power (Cpd = 14 pF at 5 V), and robust ESD protection (±1500 V HBM, ±2000 V CDM). Thermal resistance RθJA is 289.2 °C/W in its SC-70 (DCK) package, supporting operation from –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports mixed-voltage system interfacing and brown-out tolerant operation |
| Max tpd | 6 ns at VCC = 5 V - enables timing-critical signal buffering in 100+ MHz clock domains |
| Output Drive | ±8 mA at VCC = 5 V - sufficient to drive 50-pF loads with controlled edge rates, minimizing ringing |
| ICC (max) | 10 µA - ensures ultra-low static power in always-on subsystems and battery-backed logic |
| Input Voltage Tolerance | Up to 5.5 V independent of VCC - allows safe interfacing with higher-voltage controllers without level shifters |
| Operating Temp | –40°C to +125°C - qualified for industrial and automotive under-hood environments |
| ESD Rating | ±1500 V HBM - meets standard handling requirements for automated assembly lines |
Pinout & Package
74AHC1G125DCKRG4 uses the SC-70 (DCK) 5-pin surface-mount package: 2.00 mm × 2.1 mm body size, 1.25 mm × 2.00 mm footprint, 0.6 mm max height. Pin 1 is marked by a dot or beveled edge; device orientation follows JEDEC MO-203-AB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low 3-state enable input | Pulling high disables output (Y = Z); pulling low enables true pass-through (Y = A) |
| 2 (A) | Buffer input | Accepts 5.5 V-tolerant logic signals; no external pull-up/down required for defined state |
| 3 (GND) | Ground reference | Must be connected to system ground plane; shared return path for all internal logic and I/O |
| 4 (Y) | 3-state noninverting output | Drives bus or load only when OE = L; presents high-Z impedance otherwise to prevent contention |
| 5 (VCC) | Power supply | Supplies core logic and output drivers; requires local 0.1 µF ceramic bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range | 2 V to 5.5 V operation enables compatibility across 3.3 V and 5 V systems without voltage translation |
| 5.5 V-tolerant inputs | Allows direct connection to legacy 5 V microcontrollers or FPGAs while powered from 3.3 V or 2.5 V rails |
| Low dynamic power | 14 pF power dissipation capacitance (Cpd) minimizes switching current and heat generation at high frequencies |
| Controlled edge rates | Δt/Δv = 20 ns/V at 5 V limits overshoot/undershoot on PCB traces, reducing EMI and signal integrity issues |
| High-impedance fail-safe | OE tied to VCC via pullup ensures Y remains high-Z during power-up/down sequences, preventing bus contention |
Applications
| TV Video Signal Routing | Server Board Interconnect |
|---|---|
|
Use Scenario: Isolating HDMI or LVDS video signal paths between SoC and display controller during hot-plug detection. IC Role / Device Role / Timing Role: 3-state buffer controlling signal flow direction and enabling/disabling video lanes based on EDID handshake status. Use Value: Prevents signal contention during plug/unplug events; ±8 mA drive supports 100-Ω differential trace loads with <6 ns skew. |
Use Scenario: Managing shared I²C or SMBus communication between baseboard management controller (BMC) and peripheral modules. IC Role / Device Role / Timing Role: Bus isolator enabling multi-master arbitration by placing unused segments in high-Z state. Use Value: Eliminates bus lock-up during firmware updates; 2 V–5.5 V range accommodates both 3.3 V BMC and 5 V sensor modules. |
| AC Motor Control Logic | Patient Monitoring Interface |
|
Use Scenario: Buffering PWM enable signals from MCU to gate driver ICs in variable-frequency drives. IC Role / Device Role / Timing Role: Level-shifting and noise-immune signal conditioning for isolated power stage control lines. Use Value: 6 ns tpd ensures precise timing alignment between PWM edges and gate driver activation; ±1500 V HBM withstands motor EMI. |
Use Scenario: Interfacing low-power medical sensors (ECG, SpO₂) to ARM-based host processors in portable monitors. IC Role / Device Role / Timing Role: Low-quiescent-current signal conditioner for analog front-end digital control lines. Use Value: 10 µA ICC extends battery life; –40°C to +125°C rating supports sterilization cycles and extended field deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G125DCKR | Lower VCC range (1.65–5.5 V); 3.3 V optimized; slightly faster tpd (5.3 ns @ 3.3 V) | Better suited for 1.8 V/3.3 V-only systems; not rated for 2 V operation | Select when operating exclusively at 3.3 V and lowest possible propagation delay is critical |
| 74AUP1G125GW,125 | NXP variant; 0.8–3.6 V range; 9 µA ICC; 11 ns tpd @ 3.3 V; different SC-70 pinout (OE on Pin 5) | Optimized for ultra-low-power portable devices; incompatible pin mapping prevents drop-in replacement | Choose for sub-2 V battery-powered designs where 10 µA ICC is insufficient and pinout redesign is acceptable |
Compared with SN74LVC1G125DCKR and 74AUP1G125GW,125, the 74AHC1G125DCKRG4 uniquely supports full 2 V–5.5 V operation with 5.5 V-tolerant inputs - making it the only option among the three for mixed-voltage industrial interfaces requiring guaranteed 2 V startup and 5 V signal compatibility.
Availability
74AHC1G125DCKRG4 is available at Aetrix Electronics and suitable for TV video routing, server board interconnect, and AC motor control applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 74AHC1G125DCKRG4 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 SN74AHC1G125 product line delivers single-gate AHC logic for space-constrained, low-power digital interfaces - designed specifically for voltage translation, bus isolation, and signal conditioning in high-reliability embedded systems.
FAQ
What is the absolute maximum supply voltage for 74AHC1G125DCKRG4?
The absolute maximum VCC rating for 74AHC1G125DCKRG4 is 7 V, per TI's SCLS377M datasheet Section 5.1. However, continuous operation above 5.5 V violates recommended conditions and risks reliability degradation. Functional operation is guaranteed only within 2 V to 5.5 V, and 74AHC1G125DCKRG4 must never be biased beyond 7 V even transiently.
Does 74AHC1G125DCKRG4 support 5 V logic inputs when powered from 3.3 V?
Yes - 74AHC1G125DCKRG4 has 5.5 V-tolerant inputs, meaning it accepts VI up to 5.5 V regardless of VCC. When powered from 3.3 V, it safely buffers 5 V signals from legacy microcontrollers without external level shifters, a key feature confirmed in Section 7.3 of the datasheet.
What is the thermal resistance (RθJA) of 74AHC1G125DCKRG4 in its SC-70 package?
The junction-to-ambient thermal resistance (RθJA) for 74AHC1G125DCKRG4 in the SC-70 (DCK) package is 289.2 °C/W, as specified in Table 5-4 of the SCLS377M datasheet. This value assumes standard JEDEC JESD51-2 PCB mounting conditions and directly impacts maximum allowable power dissipation at elevated ambient temperatures.
Can 74AHC1G125DCKRG4 be used in automotive applications?
The standard 74AHC1G125DCKRG4 is not AEC-Q100 qualified. For automotive use, TI offers the pin-compatible SN74AHC1G125-Q1 variant, which undergoes extended temperature stress, failure analysis, and qualification testing per AEC-Q100 Rev H. 74AHC1G125DCKRG4 itself is rated for –40°C to +125°C but lacks automotive-specific reliability validation.
How should the OE pin be handled during power-up to avoid bus contention?
To ensure high-impedance output during power-up, OE must be held high until VCC stabilizes. TI recommends tying OE to VCC through a pullup resistor; minimum value depends on driver sink strength but typically 10 kΩ suffices. This prevents 74AHC1G125DCKRG4 from inadvertently driving the bus before system initialization completes.
74AHC1G125DCKRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
74AHC1G125DCKRG4 FAQ
1.How can I place an order for 74AHC1G125DCKRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHC1G125DCKRG4 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 74AHC1G125DCKRG4 reliable?
The price and inventory of 74AHC1G125DCKRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHC1G125DCKRG4 is usually 5 days.
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74AHC1G125DCKRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHC1G125DCKRG4 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 74AHC1G125DCKRG4?
For technical support, including 74AHC1G125DCKRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHC1G125DCKRG4 requirements.
6.How does Aetrix verify that 74AHC1G125DCKRG4 is sourced from the original manufacturer or authorized distributors?
All 74AHC1G125DCKRG4 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 74AHC1G125DCKRG4 meets industry standards.
7.What is the process for return or replacement of 74AHC1G125DCKRG4?
All 74AHC1G125DCKRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHC1G125DCKRG4, 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 74AHC1G125DCKRG4 part is unused and in its original packaging.
Return procedure for 74AHC1G125DCKRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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