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Texas Instruments 74AUC1G126DCKRG4
- Part No.:
- 74AUC1G126DCKRG4
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
74AUC1G126DCKRG4.pdf
- Description:
- IC BUFFER NON-INVERT 2.7V SC70-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
74AUC1G126DCKRG4 from Texas Instruments is a single-channel CMOS bus buffer gate with tri-state output, designed for 1.65–1.95 V operation and 3.6-V I/O tolerant inputs. It delivers ±8 mA output drive at 1.8 V, achieves 1.6 ns typical propagation delay (CL = 15 pF), and supports partial power-down via Ioff. It serves as an output-enable signal conditioner in portable audio interfaces and SSD control paths.
For engineers reviewing the 74AUC1G126DCKRG4 datasheet, 74AUC1G126DCKRG4 pinout, 74AUC1G126DCKRG4 application, or 74AUC1G126DCKRG4 equivalent, key selection criteria include its sub-1-V operability, 2.5 ns maximum tpd at 1.8 V, Ioff-enabled back-drive protection, 10 µA max ICC, and SC70-5 package compatibility with space-constrained embedded PCB layouts.
Technical Context
The 74AUC1G126DCKRG4 implements a noninverting buffer with active-high output enable (OE), where Y = A when OE = H, and Y = high-impedance when OE = L. Its balanced CMOS push-pull output stage enables symmetrical sourcing/sinking capability up to ±8 mA at 1.8 V, while standard CMOS inputs support overvoltage tolerance to 3.6 V independent of VCC.
It integrates Ioff circuitry that disables all I/Os when VCC = 0 V, limiting leakage to ±10 µA and preventing current backflow during partial power-down. The device operates across 0.8–2.7 V supply range but is optimized for 1.65–1.95 V, with input thresholds defined as VIH = 0.65×VCC and VIL = 0.35×VCC in that range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 0.8 V to 2.7 V; supports ultra-low-voltage systems and mixed-supply domains |
| Max Propagation Delay | 2.5 ns at 1.8 V, CL = 30 pF; enables timing-critical signal routing in high-speed digital interfaces |
| Output Drive | ±8 mA at 1.8 V; sufficient to directly drive LEDs or light capacitive loads without external buffers |
| Ioff Leakage | ±10 µA at VCC = 0 V; ensures safe isolation during hot-swap or partial power-down sequences |
| Input Voltage Tolerance | Up to 3.6 V regardless of VCC; allows level translation from 3.3-V controllers to 1.8-V logic domains |
| ESD Rating (HBM) | ±2000 V; meets industrial-grade robustness requirements without external protection diodes |
| ICC (Max) | 10 µA; minimizes quiescent power in always-on subsystems such as battery-backed status indicators |
Pinout & Package
74AUC1G126DCKRG4 uses the SC70-5 (DCK) package, measuring 2.00 mm × 1.25 mm with 0.65 mm pitch, suitable for high-density portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OE | Active-high output enable input | Drives output Y to high-impedance when low; requires pulldown resistor during power sequencing to ensure safe startup state |
| 2 - A | Noninverting data input | Accepts 0.8–3.6 V logic signals; CMOS-compatible with VIH = 0.65×VCC and VIL = 0.35×VCC |
| 3 - GND | Ground reference | Return path for all internal logic and output currents; must be low-impedance and decoupled near VCC pin |
| 4 - Y | Tri-state buffered output | Delivers inverted or noninverted logic (Y = A) depending on OE; sinks or sources up to ±8 mA at 1.8 V |
| 5 - VCC | Positive supply | Power rail for core logic and output drivers; requires local 0.1-µF ceramic bypass capacitor per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| NanoFree™ packaging | Dies-as-package construction reduces footprint to 2.00 mm × 1.25 mm, eliminating bond wires and mold compound parasitics |
| Sub-1-V operability | Functional down to 0.8 V VCC, enabling integration into emerging ultra-low-power microcontroller subsystems |
| Ioff partial power-down | Prevents damaging back-current flow when VCC is off, critical for hot-pluggable modules and modular SSD designs |
| 3.6-V I/O tolerance | Allows direct interfacing with 3.3-V controllers without level shifters, simplifying BOM and reducing board area |
| 2.5 ns max tpd at 1.8 V | Meets timing budgets for DDR clock enable paths and real-time sensor interface handshaking in portable devices |
Applications
| LED Indicator Control | SSD Power Sequencing |
|---|---|
|
Use Scenario: Driving status LEDs in portable audio docks and wireless headsets using MCU GPIO pins with limited drive strength. IC Role / Device Role / Timing Role: Signal buffer and current amplifier between low-drive MCU output and LED anode/cathode. Use Value: Eliminates need for discrete transistor drivers; ±8 mA output at 1.8 V directly illuminates standard 20-mA LEDs at reduced brightness with precise dimming control. |
Use Scenario: Enabling/disabling voltage rails or reset signals during SSD controller power-up and sleep transitions. IC Role / Device Role / Timing Role: Tri-state gate controlling enable lines to PMICs or LDOs based on host command or thermal state. Use Value: Ioff prevents backfeed from powered rails into unpowered controller sections, ensuring reliable power sequencing and avoiding latch-up. |
| Audio DAC Interface | Embedded PC Fan Control |
|
Use Scenario: Isolating and buffering mute/unmute control signals between baseband processor and audio codec in tablet platforms. IC Role / Device Role / Timing Role: Level-translating buffer for mute commands crossing 1.8-V/3.3-V domain boundaries. Use Value: 3.6-V tolerant inputs accept 3.3-V mute signals while operating from 1.8-V rail, avoiding dedicated level shifters and saving PCB space. |
Use Scenario: Conditioning PWM fan speed signals from embedded controller to brushless DC fan drivers in compact industrial PCs. IC Role / Device Role / Timing Role: Low-latency buffer isolating noisy fan driver return currents from sensitive EC GPIOs. Use Value: 1.6 ns typical tpd preserves PWM duty cycle fidelity; high-impedance state during EC reset prevents unintended fan activation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G126DBVR | Wider VCC range (1.65–5.5 V); higher ICC (max 10 µA same, but typical ~2 µA vs 0.5 µA for AUC); slower tpd (3.7 ns @ 3.3 V) | Better suited for 3.3-V–5-V systems; less optimal for sub-2-V domains due to higher VIH threshold | Select when operating above 2.5 V or requiring broader supply flexibility; avoid if targeting <1.95 V operation |
| NC7SZ126P5X | Same SC70-5 package; lower drive (±2.6 mA @ 1.8 V); higher max tpd (4.5 ns @ 1.8 V); no Ioff support | Lacks partial power-down protection; unsuitable for hot-swap or multi-rail isolation use cases | Choose only for cost-sensitive, non-isolated 1.8-V signal routing where back-drive risk is absent |
Compared with SN74LVC1G126DBVR and NC7SZ126P5X, the 74AUC1G126DCKRG4 uniquely combines sub-2-V optimization, Ioff safety, and 2.5 ns speed-making it the only choice for space-constrained, mixed-voltage SSD or portable audio subsystems requiring guaranteed high-impedance during power transitions.
Availability
74AUC1G126DCKRG4 is available at Aetrix Electronics and suitable for portable audio docks, SSD power management, and embedded PC fan control requiring stable component supply across automotive-grade temperature ranges (–40°C to +85°C).
Supply support for 74AUC1G126DCKRG4 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 delivering analog and embedded processing solutions, with over 90 years of innovation in precision analog, power management, and logic ICs.
The SN74AUC logic family targets ultra-low-voltage, high-speed portable electronics-designed specifically for 1.65–1.95 V operation with Ioff, 3.6-V I/O tolerance, and NanoFree™ packaging to minimize footprint and parasitics.
FAQ
What is the recommended pull-down resistor value for OE on the 74AUC1G126DCKRG4?
The OE pin must be tied to GND through a pulldown resistor to ensure high-impedance state during power-up. TI specifies minimum resistance based on driver sink capability; a 10-kΩ resistor is commonly used and validated in application schematics. Lower values increase current draw unnecessarily, while higher values risk slow discharge under noise coupling. For 74AUC1G126DCKRG4, 10 kΩ provides robust margin against ESD-induced glitches and meets startup timing requirements.
Does the 74AUC1G126DCKRG4 support true bidirectional data flow?
No, the 74AUC1G126DCKRG4 is a unidirectional noninverting buffer with fixed input (A) and output (Y) terminals. It does not implement bus transceiver functionality or automatic direction control. Data flows only from A to Y when OE is high; Y enters high-impedance when OE is low. For bidirectional applications, separate transmit/receive buffers or dedicated transceivers like SN74LVC245 must be used.
Can the 74AUC1G126DCKRG4 be used with a 3.3-V supply?
No-the 74AUC1G126DCKRG4 is not rated for 3.3-V operation. Its absolute maximum VCC is 3.6 V, but recommended operating range is 0.8–2.7 V, with design optimization for 1.65–1.95 V. At 3.3 V, parameters like VOH/VOL, tpd, and Ioff are unspecified and may violate reliability limits. For 3.3-V systems, TI recommends SN74LVC1G126DBVR instead.
How does Ioff protection work in the 74AUC1G126DCKRG4 during system sleep mode?
When VCC drops to 0 V, the Ioff circuitry in the 74AUC1G126DCKRG4 actively disables all input and output buffers, limiting leakage current to ±10 µA per pin. This prevents current from flowing backward through the device-for example, from a powered 3.3-V data line into an unpowered 1.8-V subsystem. This behavior is verified across –40°C to +85°C and is critical for SSDs and portable devices implementing deep-sleep states.
Is the 74AUC1G126DCKRG4 RoHS compliant and lead-free?
Yes, the 74AUC1G126DCKRG4 is RoHS compliant and features lead-free NIPDAU (nickel/palladium/gold) terminal finish. Per TI's packaging addendum, it carries MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH) and is qualified for reflow up to 260°C peak. The "G4" suffix explicitly denotes green (halogen-free, lead-free) packaging per TI's material specifications.
74AUC1G126DCKRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AUC
- 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:
- 9mA, 9mA
- Voltage - Supply:
- 0.8V ~ 2.7V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
74AUC1G126DCKRG4 FAQ
1.How can I place an order for 74AUC1G126DCKRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AUC1G126DCKRG4 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 74AUC1G126DCKRG4 reliable?
The price and inventory of 74AUC1G126DCKRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AUC1G126DCKRG4 is usually 5 days.
3.What payment methods are accepted for 74AUC1G126DCKRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AUC1G126DCKRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AUC1G126DCKRG4?
74AUC1G126DCKRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AUC1G126DCKRG4 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 74AUC1G126DCKRG4?
For technical support, including 74AUC1G126DCKRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AUC1G126DCKRG4 requirements.
6.How does Aetrix verify that 74AUC1G126DCKRG4 is sourced from the original manufacturer or authorized distributors?
All 74AUC1G126DCKRG4 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 74AUC1G126DCKRG4 meets industry standards.
7.What is the process for return or replacement of 74AUC1G126DCKRG4?
All 74AUC1G126DCKRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74AUC1G126DCKRG4, 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 74AUC1G126DCKRG4 part is unused and in its original packaging.
Return procedure for 74AUC1G126DCKRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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