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NXP Semiconductors 74AHCT126D,118
- Part No.:
- 74AHCT126D,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74AHCT126D,118.pdf
- Description:
- NOW NEXPERIA 74AHCT126D - BUS DR
- Quantity:
- Payment:
- Shipping:
Inventory:3,688
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Product details
Overview
74AHCT126D,118 from Nexperia is a quad 3-state buffer/line driver with TTL-compatible inputs, SO14 package (SOT108-1), −40 °C to +125 °C operating range, 3.3 ns typical propagation delay at 5 V/15 pF, and overvoltage-tolerant inputs enabling mixed-voltage signal translation in industrial control backplanes.
For engineers reviewing the 74AHCT126D,118 datasheet, 74AHCT126D,118 pinout, 74AHCT126D,118 application, or 74AHCT126D,118 equivalent, this device serves as a level-shifting, bus-isolating buffer for legacy TTL-to-3.3 V logic interfacing, high-noise industrial I/O expansion, and programmable logic output staging where precise enable timing and low static current are critical.
Technical Context
The 74AHCT126D,118 implements four independent non-inverting buffers, each with an active-HIGH output enable (nOE) controlling high-impedance tri-state output behavior. Its TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at 5 V) ensure compatibility with legacy 5 V TTL outputs while driving CMOS loads.
Input Schmitt-trigger action provides noise immunity on control lines; overvoltage tolerance up to 7.0 V allows safe interfacing with higher-voltage signals without external clamping. The device operates across full industrial temperature range with guaranteed static and dynamic performance at VCC = 4.5–5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation with standard 5 V supply rails and tolerates ±5% regulation drift. |
| tpd (max) | 7.0 ns at VCC = 5.5 V, CL = 15 pF - Guarantees sub-10 ns signal path delay for high-speed bus buffering in real-time control loops. |
| VIH / VIL | 2.0 V / 0.8 V - Matches TTL logic thresholds, enabling direct connection to 74LS/74F series without level shifters. |
| IOZ (max) | ±10.0 μA at −40 °C to +125 °C - Confirms robust high-impedance state integrity under worst-case thermal stress for bus contention avoidance. |
| ICC (max) | 40 μA at VCC = 5.5 V, −40 °C to +125 °C - Supports ultra-low-power standby in always-on industrial monitoring nodes. |
| ESD HBM | >2000 V - Meets IEC 61000-4-2 Level 2 system-level ESD immunity requirements for board-level integration. |
| Operating Temp | −40 °C to +125 °C - Qualified for under-hood automotive modules, motor drive control boards, and factory automation PLC I/O cards. |
Pinout & Package
74AHCT126D,118 uses the SO14 plastic small outline package (SOT108-1), 14-lead, 3.9 mm body width, with gull-wing leads and pin 1 index marked by notch or bevel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | nOE (1–4) | Active-HIGH output enable inputs - Each controls one buffer's 3-state output independently; tied together for group enable. |
| 2, 5, 9, 12 | nA (1–4) | Non-inverting data inputs - Accept TTL-level signals; overvoltage tolerant up to 7.0 V for mixed-rail interfacing. |
| 3, 6, 8, 11 | nY (1–4) | Tri-state buffered outputs - Drive CMOS or TTL loads; enter high-Z when corresponding nOE = LOW. |
| 7 | GND | Ground reference - Must be low-inductance connection to minimize switching noise coupling into logic paths. |
| 14 | VCC | Positive supply - Decoupling capacitor (100 nF ceramic) required within 5 mm of pin for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible input thresholds | VIH = 2.0 V min, VIL = 0.8 V max at 5 V - Eliminates need for external level translators when interfacing with legacy 5 V microcontrollers or FPGAs. |
| Overvoltage-tolerant inputs | Supports VI up to 7.0 V - Enables safe connection to 5 V buses while powered from 3.3 V supplies in partial-power-down systems. |
| Input Schmitt-trigger action | Hysteresis ≥ 0.3 V typical - Rejects noise on enable or data lines in electrically noisy environments like motor drives or relay panels. |
| Guaranteed 125 °C operation | Full parametric performance validated at −40 °C to +125 °C - Suitable for sealed enclosures in industrial heat zones without derating. |
| Low ICC and IOZ | ICC ≤ 40 μA, IOZ ≤ ±10 μA across full temp range - Reduces leakage-induced bus contention and supports battery-backed standby modes. |
Applications
| Industrial PLC I/O Expansion | Legacy Microcontroller Bus Interface |
|---|---|
|
Use Scenario: Isolating and buffering digital I/O signals between a 5 V PLC CPU and 3.3 V fieldbus interface ASIC. IC Role / Device Role: Quad buffer providing direction-controlled, 3-state isolation between voltage domains with simultaneous enable control. Use Value: Prevents back-driving and ground loop currents while maintaining <7 ns signal integrity across 20 cm PCB traces. |
Use Scenario: Driving multiple 74HC-series peripheral chips from a 5 V 8051 microcontroller with limited drive strength. IC Role / Device Role: Level-translating line driver translating TTL outputs to CMOS-compatible swing with rail-to-rail VOH/VOL. Use Value: Delivers 8 mA sink/source capability at 5 V, eliminating need for discrete transistor buffers on address/data bus lines. |
| Motor Drive Control Logic | Test Equipment Signal Conditioning |
|
Use Scenario: Enabling/disabling gate driver enable signals in a 3-phase inverter, synchronized to PWM dead-time logic. IC Role / Device Role: Precision-timed 3-state buffer ensuring glitch-free transitions between active and high-Z states during power stage commutation. Use Value: tdis ≤ 11.5 ns and ten ≤ 9.0 ns guarantee no shoot-through risk during fast enable/disable sequencing at 20 kHz switching frequency. |
Use Scenario: Conditioning DUT control signals in automated test equipment where multiple instruments share a common digital bus. IC Role / Device Role: Bus isolator preventing signal corruption from instrument hot-plug events or mismatched termination. Use Value: High-impedance OFF-state leakage ≤ ±10 μA ensures bus integrity even with 16 devices connected and only one enabled. |
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 |
|---|---|---|---|
| 74AHCT125D,118 | Inverting outputs (nY = NOT nA); identical pinout, specs, and package. | Required where signal polarity inversion is needed in bus arbitration or differential pair generation. | Select when logic inversion is part of the signal path; otherwise, 74AHCT126D,118 maintains non-inverting topology. |
| SN74AHCT126DR | TI-manufactured; same function, but VIL = 0.5 V max (vs. 0.8 V), lower tpd (2.9 ns typ), and different ESD rating (HBM > 4000 V). | Better noise margin in low-VIL systems; tighter timing for high-frequency clock distribution. | Prefer for designs requiring stricter input noise rejection or sub-3 ns timing; verify layout compatibility with TI's thermal pad requirements. |
Compared with 74AHCT125D,118, the 74AHCT126D,118 preserves signal polarity essential for direct bus mirroring; versus SN74AHCT126DR, it offers broader vendor support and identical Nexperia qualification for extended temperature reliability, albeit with slightly relaxed VIL and tpd specs.
Availability
74AHCT126D,118 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, motor drive control logic, and test equipment signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74AHCT126D,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, reliable logic, analog, and MOSFET solutions optimized for efficiency, miniaturization, and robustness in industrial and automotive applications.
The 74AHCT126D,118 belongs to Nexperia's AHCT logic family, designed specifically for seamless TTL-to-CMOS interfacing in harsh-environment systems where wide temperature operation, noise immunity, and voltage translation are mandatory.
FAQ
Can 74AHCT126D,118 operate reliably at 3.3 V supply?
No - the 74AHCT126D,118 is TTL-input compatible and specified only for VCC = 4.5 V to 5.5 V. At 3.3 V, VIH minimum (2.0 V) is met, but VOH and VOL degrade beyond specification, and propagation delay increases significantly. Use 74AHC126D,118 for 3.3 V operation.
What is the maximum capacitive load supported without timing degradation?
The datasheet guarantees tpd ≤ 7.0 ns and tdis ≤ 11.5 ns up to CL = 50 pF at VCC = 5.5 V. Beyond 50 pF, propagation delay increases linearly (~0.03 ns/pF), and output rise/fall times degrade; for loads >75 pF, add series termination or buffer staging.
Is the GND pin (pin 7) electrically connected to the exposed pad in SO14?
No - the SO14 package (SOT108-1) has no exposed thermal pad. Pin 7 is the sole GND connection. Unlike QFN variants, SO14 relies on leadframe conduction; ensure PCB GND pour connects directly to pin 7 with ≥0.3 mm trace width.
How does Schmitt-trigger action benefit enable-line routing?
Schmitt-trigger inputs on all pins provide ≥0.3 V hysteresis, rejecting noise spikes ≤15 ns duration on nOE lines. This prevents false enable/disable toggling in high-dI/dt environments like adjacent motor drivers or relay coils, eliminating need for RC filtering on control signals.
74AHCT126D,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74AHCT
- Package/Case:
- 14-SOIC (0.154", 3.90mm 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:
- 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-SO
74AHCT126D,118 FAQ
1.How can I place an order for 74AHCT126D,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT126D,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 74AHCT126D,118 reliable?
The price and inventory of 74AHCT126D,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT126D,118 is usually 5 days.
3.What payment methods are accepted for 74AHCT126D,118?
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4.How is shipping managed for 74AHCT126D,118?
74AHCT126D,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT126D,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 74AHCT126D,118?
For technical support, including 74AHCT126D,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT126D,118 requirements.
6.How does Aetrix verify that 74AHCT126D,118 is sourced from the original manufacturer or authorized distributors?
All 74AHCT126D,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 74AHCT126D,118 meets industry standards.
7.What is the process for return or replacement of 74AHCT126D,118?
All 74AHCT126D,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT126D,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 74AHCT126D,118 part is unused and in its original packaging.
Return procedure for 74AHCT126D,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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