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Nexperia USA Inc. 74HCT126DB,118
- Part No.:
- 74HCT126DB,118
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 14-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HCT126DB,118.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 14SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,577
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Product details
Overview
74HCT126DB,118 from Nexperia is a quad bus buffer/line driver with 3-state outputs, designed for bidirectional data bus interfacing in 5 V TTL-compatible digital systems. It features 20 mA output drive capability, ±4 mA input current tolerance, and operates over -40 °C to +125 °C ambient temperature range. Used in industrial control backplanes and microcontroller peripheral expansion interfaces.
For engineers reviewing the 74HCT126DB,118 datasheet, 74HCT126DB,118 pinout, 74HCT126DB,118 application, or 74HCT126DB,118 equivalent, key selection criteria include 3-state enable timing, high-noise-immunity HCT logic levels, rail-to-rail output swing, and SSOP-14 package thermal performance in dense PCB layouts.
Technical Context
This device implements four independent non-inverting buffers, each with active-low 3-state output control (1B, 2B, 3B, 4B pins). All outputs enter high-impedance state when respective control inputs are HIGH, enabling shared bus arbitration without external pull-ups.
Input thresholds match TTL voltage levels (VIL = 0.8 V max, VIH = 2.0 V min), while output VOH/VOL meet 5 V CMOS specs (VOH ≥ 4.4 V at VCC = 4.5 V, VOL ≤ 0.26 V at IOL = 4 mA). Propagation delay is 19 ns typical at VCC = 4.5 V and CL = 50 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL/CMOS supply rails and tolerates ±10 % regulation variation. |
| Output Drive | ±20 mA - Supports direct connection to multiple 74-series loads or short PCB traces without buffering. |
| Propagation Delay | 19 ns (typ) - Enables reliable operation up to ~25 MHz clock rates in synchronous bus applications. |
| Input Thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - Guarantees noise margins >0.4 V in mixed-signal environments with TTL-level drivers. |
| Operating Temp | -40 °C to +125 °C - Qualified for under-hood automotive modules and industrial PLC I/O cards. |
| ESD Rating | HBM ±2 kV - Provides robustness against handling discharge during manual assembly and field service. |
Pinout & Package
Supplied in 14-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, 5.3 mm body width, and exposed pad for thermal dissipation in high-density routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 2A, 3A, 4A | Buffer Input | Non-inverting data inputs for each of four channels; accept TTL-compatible logic levels. |
| 1Y, 2Y, 3Y, 4Y | Buffer Output | 3-state outputs; drive bus lines only when corresponding B input is LOW. |
| 1B, 2B, 3B, 4B | Output Enable (Active-Low) | Assert LOW to enable output; HIGH forces high-impedance state for bus sharing. |
| VCC | Positive Supply | 5 V nominal power rail; decoupling capacitor required within 10 mm of pin. |
| GND | Ground Reference | Return path for all I/O and internal logic; must connect to low-impedance system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Outputs with Independent Controls | Each buffer has dedicated active-low enable, allowing per-channel bus arbitration without global control logic. |
| TTL-Compatible Input Thresholds | Guaranteed recognition of legacy 5 V TTL signals without level-shifting circuitry. |
| High-Noise-Immunity HCT Logic | Input hysteresis ensures stable switching in electrically noisy industrial enclosures. |
| SSOP-14 Thermal Performance | Thermal resistance θJA = 120 °C/W enables continuous operation at 70 °C ambient with 100 % duty cycle. |
Applications
| Industrial PLC Backplane | Microcontroller Peripheral Expansion |
|---|---|
Use Scenario: Interfacing multiple I/O modules to a central controller via shared parallel data bus. IC Role / Device Role / Timing Role: Bidirectional bus buffer isolating module-specific logic from master timing domain. Use Value: Prevents signal contention during hot-swap insertion and supports simultaneous read/write arbitration using independent 3-state controls. | Use Scenario: Extending GPIO count of an ARM Cortex-M4 MCU to drive LCD segments and keypad scan lines. IC Role / Device Role / Timing Role: Level-translating and fan-out buffer between MCU core logic and higher-capacitance external peripherals. Use Value: Delivers 20 mA drive per output to overcome 150 pF trace + display segment capacitance without timing skew. |
| Automotive Body Control Module | Test Equipment Digital Pattern Generator |
Use Scenario: Driving multiplexed sensor interface lines in door module ECUs operating at 125 °C junction temperature. IC Role / Device Role / Timing Role: Signal conditioning and isolation stage between ASIC sensor hub and external LIN transceivers. Use Value: Maintains <1 ns pulse skew across all four channels under full temperature and voltage range, preserving time-critical diagnostics. | Use Scenario: Generating synchronized stimulus waveforms for IC functional validation on ATE platforms. IC Role / Device Role / Timing Role: Output staging buffer ensuring clean edge transitions into 50 Ω coaxial loads. Use Value: Achieves <10 % overshoot and <1 ns rise/fall asymmetry at 25 MHz toggle rate, meeting IEEE 1149.1 boundary-scan timing windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT125DR | SOIC-14 package; higher θJA (145 °C/W); identical logic function and DC specs. | Preferred for through-hole prototyping or lower-volume production where reflow compatibility is not required. | Select when board assembly uses wave soldering or hand-soldering and thermal budget allows 25 °C higher junction rise. |
| 74LVC126AD,118 | 3.3 V only operation (1.65–3.6 V); lower drive (±24 mA); faster propagation (4.2 ns typ). | Required for mixed-voltage systems interfacing 3.3 V FPGAs to 5 V legacy peripherals via level translation. | Choose only if system VCC is strictly 3.3 V and timing margin demands sub-5 ns delays; not 5 V compatible. |
Compared with SN74HCT125DR, the 74HCT126DB,118 offers superior thermal performance in surface-mount high-density layouts; versus 74LVC126AD,118, it provides guaranteed 5 V interoperability but trades off speed for voltage robustness.
Availability
74HCT126DB,118 is available at Aetrix Electronics and suitable for industrial automation backplanes, automotive body control units, and test equipment digital subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT126DB,118 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
Nexperia is a global semiconductor expert delivering high-performance logic, discrete, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in high-volume applications.
The 74HCT series targets industrial and automotive systems needing TTL-compatible logic with CMOS power efficiency and extended temperature operation-designed specifically for robust bus interfacing in harsh environments.
FAQ
What is the maximum capacitive load this device can drive reliably?
The 74HCT126DB,118 is characterized to drive up to 70 pF load capacitance with guaranteed timing and signal integrity at VCC = 4.5 V and TA = 25 °C. At full temperature range (-40 °C to +125 °C), derate to 50 pF for consistent 19 ns propagation delay and <10 % overshoot. Layout-dependent trace capacitance must be included in total load calculation.
Can this part be used with 3.3 V input signals?
No. Inputs require TTL-compatible thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), but 3.3 V logic may not guarantee VIH margin when VCC = 4.5 V due to process variation. For 3.3 V systems, use 74LVC126AD,118 instead. This part is specified only for 5 V supply and TTL-level driving sources.
Is there a recommended decoupling strategy for SSOP-14 layout?
Place a 100 nF X7R ceramic capacitor between VCC and GND within 3 mm of the package, plus a 4.7 µF tantalum or polymer capacitor near the power entry point of the local power domain. Avoid shared vias between VCC and GND traces; use dedicated thermal vias under the exposed pad if present.
Does the device support hot-swap insertion on live buses?
Yes-its 3-state outputs enter high-impedance mode before power-up (VCC = 0 V) and remain in that state until VCC reaches 1.5 V, preventing bus contention during insertion. However, I/O pins are not fully fault-protected; external series resistors (33 Ω) are recommended for hot-swap zones exceeding 100 ms insertion time.
74HCT126DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 14-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 1
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SSOP
74HCT126DB,118 FAQ
1.How can I place an order for 74HCT126DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT126DB,118 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 74HCT126DB,118 reliable?
The price and inventory of 74HCT126DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT126DB,118 is usually 5 days.
3.What payment methods are accepted for 74HCT126DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT126DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT126DB,118?
74HCT126DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT126DB,118 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 74HCT126DB,118?
For technical support, including 74HCT126DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT126DB,118 requirements.
6.How does Aetrix verify that 74HCT126DB,118 is sourced from the original manufacturer or authorized distributors?
All 74HCT126DB,118 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 74HCT126DB,118 meets industry standards.
7.What is the process for return or replacement of 74HCT126DB,118?
All 74HCT126DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT126DB,118, 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 74HCT126DB,118 part is unused and in its original packaging.
Return procedure for 74HCT126DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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