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Texas Instruments 74AHCT1G126DCKTG4
- Part No.:
- 74AHCT1G126DCKTG4
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
74AHCT1G126DCKTG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,215
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Product details
Overview
74AHCT1G126DCKTG4 from Texas Instruments is a single 3-state bus buffer gate with TTL-compatible inputs, operating at 4.5–5.5 V, delivering ±8 mA output drive, 6 ns max propagation delay at 5 V, and 10 µA max ICC. It serves as a level-translating line driver in compact 5-pin SC-70 packages for space-constrained digital interface applications.
For engineers reviewing the 74AHCT1G126DCKTG4 datasheet, 74AHCT1G126DCKTG4 pinout, 74AHCT1G126DCKTG4 application, or 74AHCT1G126DCKTG4 equivalent, this page delivers verified electrical specs, thermal metrics, functional modes, real-world use cases, and validated alternative parts - all specific to the SC-70 (DCK) packaged variant.
Technical Context
The 74AHCT1G126DCKTG4 implements a true-buffer logic function with active-high 3-state control: when OE is high, A passes directly to Y; when OE is low, Y enters high-impedance state. Its TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V) enable reliable 3.3 V-to-5 V up-translation without external biasing.
Designed for low-noise bus driving, it features slow edge rates (20 ns/V input transition rate limit) and reduced output drive (±8 mA) to suppress ringing on light loads - critical in graphics card interconnects and ADAS sensor interfaces where signal integrity outweighs speed.
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 loss. |
| Max tPD | 6 ns at 5 V - enables timing-critical data path buffering in server motherboard control buses and DLP projection timing chains. |
| Output Drive | ±8 mA at 5 V - sufficient for driving short PCB traces or light capacitive loads while minimizing EMI and overshoot. |
| ICC (max) | 10 µA - supports ultra-low static power in always-on motor control monitoring circuits and battery-backed subsystems. |
| Input Compatibility | TTL voltage levels (VIL ≤ 0.8 V, VIH ≥ 2.0 V) - allows direct interfacing with legacy 5 V TTL outputs without level shifters. |
| Operating Temp | –40 °C to +125 °C - qualified for under-hood ADAS modules and industrial motor drive control boards. |
| ESD Rating | ±2000 V HBM - meets IEC 61000-4-2 system-level robustness requirements for field-deployable electronics. |
Pinout & Package
74AHCT1G126DCKTG4 uses the SC-70 (DCK) 5-pin surface-mount package: 2.0 mm × 2.1 mm body size, 1.25 mm × 2.0 mm footprint, 1.1 mm max height. Pin 1 is marked in Q3 quadrant per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-high output enable | Drives Y into high-Z when low; requires pulldown resistor during power-up to prevent bus contention. |
| 2 (A) | Data input | TTL-compatible input accepting 0–5.5 V; internally clamped to avoid latch-up under transient overvoltage. |
| 3 (GND) | Ground reference | Primary return path for logic and output current; must be low-inductance connection to minimize ground bounce. |
| 4 (Y) | 3-state buffered output | True-output (non-inverting) with ±8 mA sink/source capability; high-Z state isolates downstream bus segments. |
| 5 (VCC) | Power supply | 5 V nominal supply; requires local 0.1 µF ceramic bypass capacitor placed within 2 mm of pin for stable switching. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Enables seamless integration with legacy 5 V microcontrollers and FPGAs without level-shifting circuitry. |
| Slow edge rate control | 20 ns/V input transition specification reduces harmonic content and minimizes radiated emissions in EMC-sensitive ADAS modules. |
| Low-power 3-state operation | 10 µA max ICC and fast high-Z entry/exit (tPZL/tPHZ ≤ 6.5 ns) support dynamic bus arbitration in multi-master systems. |
| Robust latch-up immunity | Exceeds 250 mA per JESD17 - prevents destructive latch-up during hot-plug events in server motherboard expansion slots. |
| Thermal performance | RθJA = 289.2 °C/W (DCK) - enables operation at full rating in thermally constrained graphics card PCB layers without forced air. |
Applications
| Motor Control Interface | Graphics Card Bus Isolation |
|---|---|
Use Scenario: Isolating microcontroller GPIOs from high-current motor driver enable lines in AC induction drives. IC Role / Device Role / Timing Role: 3-state buffer providing controlled signal gating and noise isolation between logic and power stages. Use Value: Prevents backfeed and ground bounce during motor commutation transients while maintaining deterministic timing via 6 ns tPD. | Use Scenario: Buffering configuration signals between GPU and VRAM controller in compact PCIe-based graphics cards. IC Role / Device Role / Timing Role: Single-bit bus driver enabling hot-swap-safe memory initialization handshake sequences. Use Value: ±8 mA drive and slow edges suppress signal reflections on dense 10+ layer PCBs, ensuring setup/hold margin compliance at 100+ MHz. |
| ADAS Sensor Hub Interface | DLP Projection Timing Chain |
Use Scenario: Level-translating diagnostic status bits from 3.3 V camera SoCs to 5 V CAN transceiver monitoring logic in automotive ADAS domains. IC Role / Device Role / Timing Role: Up-translating buffer with TTL input thresholds ensuring reliable detection of 3.3 V logic highs at 5 V domain. Use Value: Eliminates need for discrete resistor dividers or dedicated level shifters, reducing BOM count and board area in ASIL-B compliant designs. | Use Scenario: Synchronizing lamp enable and color wheel position signals in DLP front projection systems requiring precise sub-microsecond timing alignment. IC Role / Device Role / Timing Role: Low-skew, low-jitter buffer preserving edge integrity across temperature extremes (–40 °C to +125 °C). Use Value: 6 ns max tPD variation across full temp range ensures consistent pixel clock phase alignment, preventing image tearing artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT1G125DCKRG4 | Inverting buffer (A → Y̅); identical VCC, drive, timing, and package. | Requires logic inversion in signal path; unsuitable where polarity must be preserved. | Select only if system-level inversion is acceptable or compensated elsewhere in firmware/hardware. |
| 74LVC1G126GW,125 | 3.3 V only (1.65–5.5 V), lower drive (±32 mA), faster tPD (3.3 ns), different pinout (SOT353). | Better for mixed-voltage 3.3 V systems but not drop-in for 5 V-only designs; requires layout change. | Prefer for new 3.3 V designs needing higher speed; avoid for 5 V legacy replacement due to incompatible pin mapping and supply constraints. |
Compared with SN74AHCT1G125DCKRG4, 74AHCT1G126DCKTG4 preserves signal polarity essential for control-line integrity; versus 74LVC1G126GW,125, it guarantees 5 V rail compatibility and matches TI's SC-70 footprint - critical for drop-in replacement in existing production boards.
Availability
74AHCT1G126DCKTG4 is available at Aetrix Electronics and suitable for motor controls, graphics card interconnects, ADAS sensor hubs, and DLP projection timing chains requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74AHCT1G126DCKTG4 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 decades of expertise in high-reliability industrial and automotive-grade components.
The SN74AHCT1G126 product line delivers single-gate 3-state buffers optimized for noise-immune, low-power digital interfacing in space-constrained applications - targeting motor control, display, and safety-critical automotive subsystems.
FAQ
What is the maximum operating temperature for the 74AHCT1G126DCKTG4?
The 74AHCT1G126DCKTG4 is rated for continuous operation from –40 °C to +125 °C ambient temperature. This full industrial temperature range is validated per JEDEC JESD22-A108 and supports deployment in under-hood ADAS modules, server motherboards, and industrial motor drives where thermal margins are tight.
Does the 74AHCT1G126DCKTG4 require external pull-up or pull-down resistors on its OE pin?
Yes - to ensure the output remains in high-impedance state during power-up or power-down, the OE pin of the 74AHCT1G126DCKTG4 must be tied to GND through a pulldown resistor. TI recommends a value determined by the driver's current-sourcing capability; typical values range from 10 kΩ to 100 kΩ depending on system noise immunity requirements.
Can the 74AHCT1G126DCKTG4 interface directly with 3.3 V microcontrollers?
Yes - the 74AHCT1G126DCKTG4 accepts TTL-compatible input voltages (VIH ≥ 2.0 V, VIL ≤ 0.8 V), making it fully compatible with 3.3 V CMOS outputs. When powered at 5 V, it functions as a robust 3.3 V-to-5 V level translator without external components, commonly used in graphics card and ADAS sensor hub designs.
What is the thermal resistance (RθJA) of the 74AHCT1G126DCKTG4 in its SC-70 package?
The 74AHCT1G126DCKTG4 in the SC-70 (DCK) package has a junction-to-ambient thermal resistance (RθJA) of 289.2 °C/W, measured per JEDEC JESD51-2 on a standard 2-layer board. This value assumes no copper pour or thermal vias; adding 1 in² of 2-oz copper on top/bottom layers can reduce RθJA by ~30–40 °C/W in practice.
Is the 74AHCT1G126DCKTG4 pin-compatible with other SC-70 5-pin logic devices?
No - while the 74AHCT1G126DCKTG4 shares the SC-70 (DCK) mechanical footprint with other 5-pin logic devices, its pinout (OE-A-GND-Y-VCC) is function-specific and not universally compatible. For example, SN74LVC1G126GW uses SOT353 with different pin assignment. Always verify pin mapping against the exact device's datasheet before PCB layout.
74AHCT1G126DCKTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
74AHCT1G126DCKTG4 FAQ
1.How can I place an order for 74AHCT1G126DCKTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT1G126DCKTG4 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 74AHCT1G126DCKTG4 reliable?
The price and inventory of 74AHCT1G126DCKTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT1G126DCKTG4 is usually 5 days.
3.What payment methods are accepted for 74AHCT1G126DCKTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT1G126DCKTG4 transactions.
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4.How is shipping managed for 74AHCT1G126DCKTG4?
74AHCT1G126DCKTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT1G126DCKTG4 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 74AHCT1G126DCKTG4?
For technical support, including 74AHCT1G126DCKTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT1G126DCKTG4 requirements.
6.How does Aetrix verify that 74AHCT1G126DCKTG4 is sourced from the original manufacturer or authorized distributors?
All 74AHCT1G126DCKTG4 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 74AHCT1G126DCKTG4 meets industry standards.
7.What is the process for return or replacement of 74AHCT1G126DCKTG4?
All 74AHCT1G126DCKTG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT1G126DCKTG4, 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 74AHCT1G126DCKTG4 part is unused and in its original packaging.
Return procedure for 74AHCT1G126DCKTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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