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Nexperia USA Inc. 74VHCT126PW,118
- Part No.:
- 74VHCT126PW,118
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74VHCT126PW,118.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,358
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Product details
Overview
74VHCT126PW,118 from Nexperia is a quad non-inverting 3-state buffer/line driver with TTL-compatible inputs, operating at 4.5–5.5 V supply, featuring 3.0 ns typical propagation delay (CL = 15 pF), ±8 mA output drive, and -40 °C to +125 °C temperature range - used for bus interface isolation and signal level translation in industrial control backplanes.
For engineers reviewing the 74VHCT126PW,118 datasheet, 74VHCT126PW,118 pinout, 74VHCT126PW,118 application, or 74VHCT126PW,118 equivalent, this page delivers verified pin functions, real-world timing behavior under load, thermal derating curves for TSSOP14, and validated alternatives for bus buffering in mixed-voltage systems.
Technical Context
This device implements four independent non-inverting buffers, each with an active-HIGH 3-state output enable (nOE) controlling high-impedance output states. Input thresholds are fixed at VIH = 2.0 V and VIL = 0.8 V (TTL-compatible), enabling direct interfacing with legacy LSTTL logic without level shifters.
Propagation delay (tpd), enable time (ten), and disable time (tdis) are characterized across voltage (4.5–5.5 V), temperature (-40 °C to +125 °C), and capacitive load (15–50 pF). Dynamic power dissipation is governed by CPD = 12 pF, supporting low-noise switching in noise-sensitive digital subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.5–5.5 V - ensures compatibility with standard 5 V TTL and mixed-supply systems; not rated below 4.5 V for TTL input operation. |
| Propagation Delay (tpd) | 3.0 ns (typ) at VCC = 5.0 V, CL = 15 pF - enables reliable 100+ MHz bus operation with margin for trace delays and skew. |
| Output Drive (IO) | ±8.0 mA - sufficient to drive 50 pF loads with <7.5 ns delay, supporting multi-drop PCB traces up to 10 cm. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - matches LSTTL logic levels, eliminating need for external level-shifting circuitry. |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood industrial and extended-temperature embedded applications. |
| ESD Protection | HBM >2000 V, CDM >1000 V - meets IEC 61000-4-2 Level 2 requirements for board-level handling robustness. |
| Power Dissipation Cap | 500 mW (Tamb ≤ 81 °C); derates 7.3 mW/K above 81 °C - defines maximum continuous switching frequency in thermally constrained TSSOP14 layouts. |
Pinout & Package
TSSOP14 plastic thin shrink small outline package (SOT402-1), 14-lead, body width 4.4 mm, 0.65 mm pitch, exposed pad optional, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | nOE (Output Enable) | Active-HIGH control per buffer; LOW forces corresponding nY output into high-impedance state. |
| 2, 5, 9, 12 | nA (Data Input) | Non-inverting input; accepts TTL-level signals; Schmitt-trigger action prevents noise-induced glitches. |
| 3, 6, 8, 11 | nY (Data Output) | 3-state buffered output; drives bus lines bidirectionally when enabled; high-Z when nOE = LOW. |
| 7 | GND | Reference ground for all I/O and supply; requires low-inductance connection to minimize switching noise. |
| 14 | VCC | Primary supply rail; decoupling capacitor (100 nF ceramic) required within 5 mm of pin for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-compatible with LSTTL | Direct drop-in replacement for 74LS126 in legacy designs without layout change or voltage adjustment. |
| TTL-input compatible | Guaranteed VIH/VIL thresholds (2.0 V / 0.8 V) ensure reliable recognition of 5 V TTL outputs across full temperature range. |
| Balanced propagation delays | tpLH and tpHL match within 0.3 ns (typ), minimizing duty-cycle distortion on clock or data buses. |
| Schmitt-trigger inputs | Hysteresis ≥0.3 V suppresses ringing and contact bounce on slow-rising control lines (e.g., manual switches, long cables). |
| High-impedance OFF-state leakage | IOZ ≤ ±0.25 μA at VCC = 5.5 V - negligible bus loading during tri-state, critical for hot-swap and shared-bus arbitration. |
Applications
| Industrial Backplane Interface | Legacy System Bus Isolation |
|---|---|
Use Scenario: Isolating microcontroller GPIOs from noisy 5 V parallel address/data buses in programmable logic controllers. IC Role / Device Role / Timing Role: Non-inverting buffer with 3-state control enables dynamic bus ownership handoff between CPU and peripheral ASICs. Use Value: 3.0 ns tpd and matched rise/fall times preserve setup/hold margins for 20 MHz bus cycles; ±8 mA drive sustains signal integrity over 8-inch FR4 traces. |
Use Scenario: Replacing obsolete 74LS126 in field-upgraded instrumentation racks retaining original PCBs. IC Role / Device Role / Timing Role: Pin-identical TTL-compatible buffer allowing zero-layout-change migration from bipolar to CMOS technology. Use Value: 2000 V HBM ESD rating improves field reliability vs. LS parts; 500 mW thermal limit supports continuous operation in sealed enclosures. |
| Multi-Drop Sensor Hub | Configurable I/O Expander Interface |
Use Scenario: Driving shared analog multiplexer control lines from multiple microcontrollers in HVAC sensor networks. IC Role / Device Role / Timing Role: 3-state outputs prevent contention when multiple masters assert control signals onto common bus lines. Use Value: IOZ ≤ ±0.25 μA ensures <1 μA total leakage across 4 channels - avoids false triggering of high-impedance analog switches. |
Use Scenario: Translating 3.3 V MCU GPIOs to 5 V logic levels for driving LED indicators and relay drivers. IC Role / Device Role / Timing Role: Level-shifting buffer with TTL input thresholds accepts 3.3 V logic highs while sourcing 5 V-compatible outputs. Use Value: VIH = 2.0 V guarantees recognition of 3.3 V MCU outputs; VOH ≥ 3.7 V at -8 mA meets 5 V TTL fanout requirements. |
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 |
|---|---|---|---|
| 74VHC126PW,118 | CMOS-input version; VIH = 3.85 V at VCC = 5.5 V; wider VCC range (2.0–5.5 V) | Requires 3.3 V or 5 V CMOS-level sources; unsuitable for direct LSTTL input without pull-ups | Select when interfacing with modern low-voltage MCUs or when operating below 4.5 V supply. |
| SN74LVC126APWR | Lower VCC range (1.65–3.6 V); 3.3 V only; higher speed (2.5 ns tpd); different pinout (SO-14 only) | Not pin-compatible; requires PCB redesign; incompatible with 5 V buses or LSTTL inputs | Choose only for new 3.3 V-only designs requiring sub-3 ns timing and lower static current (ICC < 1 μA). |
Compared with 74VHCT126PW,118, the 74VHC126PW,118 offers broader supply flexibility but lacks TTL input compatibility, while SN74LVC126APWR delivers faster timing at the cost of 5 V interoperability and mechanical fit - making the VHCT variant optimal for drop-in LSTTL upgrades.
Availability
74VHCT126PW,118 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy system refurbishment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74VHCT126PW,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 manufacturability in high-volume applications.
The 74VHCT series targets pin-compatible upgrades of legacy TTL systems, emphasizing robustness, wide temperature operation, and seamless integration into existing 5 V digital infrastructure.
FAQ
Can 74VHCT126PW,118 operate at 3.3 V supply?
No - the 74VHCT126PW,118 is specified only for 4.5–5.5 V operation. At 3.3 V, input thresholds (VIH = 2.0 V) may be met, but VOH drops below TTL-compliant levels (guaranteed ≥3.7 V at VCC = 4.5 V, not at 3.3 V), and dynamic performance is uncharacterized. Use 74VHC126PW,118 or 74LVC126 for 3.3 V systems.
What is the maximum capacitive load for guaranteed 7.5 ns propagation delay?
At VCC = 4.5–5.5 V and Tamb = 25 °C, the datasheet guarantees tpd ≤ 7.5 ns for CL = 50 pF. This includes probe/jig capacitance; actual PCB trace + IC input capacitance must stay ≤ 45 pF to maintain margin. Exceeding 50 pF increases delay nonlinearly and risks timing violations in 20+ MHz buses.
Is thermal pad connection required for TSSOP14 package?
The SOT402-1 (TSSOP14) package has no exposed thermal pad - it uses standard gull-wing leads only. Thermal performance relies on copper pour under the body and short traces to GND/VCC planes. Derating begins at 81 °C ambient, with 7.3 mW/K linear reduction above that point.
How does Schmitt-trigger input action benefit this device?
Schmitt-trigger inputs provide ~0.3 V hysteresis, rejecting noise on slow-rising signals such as mechanical switch closures, long cable runs, or unterminated stubs. This prevents metastability and double-clocking in enable/control lines - critical for reliable bus arbitration and power sequencing in industrial environments.
74VHCT126PW,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74VHCT
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
74VHCT126PW,118 FAQ
1.How can I place an order for 74VHCT126PW,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHCT126PW,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 74VHCT126PW,118 reliable?
The price and inventory of 74VHCT126PW,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHCT126PW,118 is usually 5 days.
3.What payment methods are accepted for 74VHCT126PW,118?
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Once your 74VHCT126PW,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 74VHCT126PW,118?
For technical support, including 74VHCT126PW,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHCT126PW,118 requirements.
6.How does Aetrix verify that 74VHCT126PW,118 is sourced from the original manufacturer or authorized distributors?
All 74VHCT126PW,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 74VHCT126PW,118 meets industry standards.
7.What is the process for return or replacement of 74VHCT126PW,118?
All 74VHCT126PW,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74VHCT126PW,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 74VHCT126PW,118 part is unused and in its original packaging.
Return procedure for 74VHCT126PW,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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