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NXP Semiconductors 74HCT126DB,112
- Part No.:
- 74HCT126DB,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 14-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HCT126DB,112.pdf
- Description:
- IC BUFFER DVR TRI-ST QD 14SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,226
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Product details
Overview
74HCT126DB,112 from Nexperia is a quad 3-state buffer/line driver with TTL-compatible inputs and CMOS outputs, operating from 4.5 V to 5.5 V, delivering ±6 mA output drive at VCC = 4.5 V, and supporting industrial temperature range (−40 °C to +125 °C) in SO14 package. It enables bidirectional bus control in microcontroller peripheral interfaces, memory address latching, and digital signal routing where level translation and bus isolation are required.
For engineers reviewing the 74HCT126DB,112 datasheet, 74HCT126DB,112 pinout, 74HCT126DB,112 application, or 74HCT126DB,112 equivalent, key selection criteria include TTL-level input compatibility, 3-state enable timing (ten ≤ 38 ns @ VCC = 4.5 V), propagation delay (tpd ≤ 36 ns), output drive capability, and SO14 package thermal derating (10.1 mW/K above 100 °C).
Technical Context
The 74HCT126DB,112 implements four independent non-inverting buffers, each with an active-HIGH output enable (nOE) controlling high-impedance OFF-state on the corresponding nY output. Its TTL-input threshold (VIH = 2.0 V min, VIL = 0.8 V max @ VCC = 4.5–5.5 V) ensures direct interfacing with legacy 5 V logic families without level shifters.
Internal clamping diodes on all inputs allow safe operation with input voltages exceeding VCC when current-limiting resistors are used. The device complies with JESD7A (2.0–6.0 V) and JEDEC JESD8C (2.7–3.6 V), and meets HBM ESD rating >2000 V and CDM >1000 V per JS-001/JS-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation across standard 5 V rail tolerances and brown-out margins. |
| Input Threshold (VIH/VIL) | 2.0 V / 0.8 V - Guarantees reliable recognition of TTL logic levels without external biasing. |
| Output Drive (IO) | ±6.0 mA - Sufficient to drive 10 LSTTL loads or 50 pF capacitive bus lines at full speed. |
| Propagation Delay (tpd) | ≤36 ns @ VCC = 4.5 V, CL = 50 pF - Enables use in 10–15 MHz digital control buses with timing margin. |
| Enable/Disable Time (ten/tdis) | ≤38 ns / ≤42 ns @ VCC = 4.5 V - Supports fast bus arbitration and dynamic line sharing in multiplexed systems. |
| Operating Temperature | −40 °C to +125 °C - Qualified for under-hood, industrial PLC, and power supply control environments. |
| Power Dissipation (Ptot) | 500 mW @ Tamb ≤ 100 °C, derates 10.1 mW/K above - Defines maximum continuous power in SO14 before thermal shutdown risk. |
Pinout & Package
74HCT126DB,112 is housed in a plastic small outline package (SO14, SOT108-1) with 14 leads and 3.9 mm body width, optimized for surface-mount reflow assembly and board-level thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | nOE (1OE–4OE) | Active-HIGH enable inputs - Assert HIGH to activate corresponding buffer output; LOW forces high-impedance state. |
| 2, 5, 9, 12 | nA (1A–4A) | Non-inverting data inputs - Accept TTL-level signals; internal clamp diodes permit overvoltage-safe interfacing. |
| 3, 6, 8, 11 | nY (1Y–4Y) | Buffered non-inverting outputs - Deliver CMOS-level outputs with ±6 mA drive and low VOL (≤0.4 V @ 6 mA). |
| 7 | GND | Ground reference - Must be connected to system 0 V plane; serves as return path for all I/O and supply currents. |
| 14 | VCC | Positive supply - Supplies core logic and output stages; decoupling capacitor (100 nF) required within 5 mm. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH ≥ 2.0 V and VIL ≤ 0.8 V @ 4.5–5.5 V - Eliminates need for external level translators when interfacing with 5 V microcontrollers or legacy logic. |
| 3-state output control | Four independent nOE pins - Enables concurrent bus sharing among multiple drivers without contention or signal corruption. |
| Input clamp diodes | Integrated protection on all inputs - Allows safe connection to signals up to VCC + 0.5 V using series current-limiting resistors. |
| High noise immunity | Typical noise margin >1.0 V - Reduces susceptibility to crosstalk and ground bounce in dense PCB layouts. |
| Industrial temperature grade | −40 °C to +125 °C operation - Validated for use in motor drives, power converters, and factory automation equipment. |
Applications
| Microcontroller Bus Interface | Memory Address Latching |
|---|---|
Use Scenario: Isolating and driving address/data lines between an ARM Cortex-M4 MCU and external SRAM or flash memory. IC Role / Device Role / Timing Role: Acts as unidirectional address buffer with 3-state control synchronized to memory access strobes (e.g., ALE, OE). Use Value: Prevents bus contention during read/write cycles and provides sufficient drive strength (±6 mA) for 10 cm trace lengths loaded with 50 pF. |
Use Scenario: Latching 16-bit address lines from a Z80 CPU to static RAM in retro-computing or embedded instrumentation designs. IC Role / Device Role / Timing Role: Functions as non-inverting latch-enable buffer, activated only during address setup phase to avoid glitches on memory inputs. Use Value: Delivers sub-40 ns enable/disable timing to meet Z80's 200 ns address hold requirement while maintaining signal integrity. |
| Digital Signal Routing | Peripheral Multiplexing |
Use Scenario: Selectively routing UART, SPI, or I²C signals between multiple sensors and a central host controller on shared PCB traces. IC Role / Device Role / Timing Role: Provides electrically isolated signal paths via 3-state outputs, controlled by FPGA GPIOs to configure routing topology. Use Value: Enables dynamic reconfiguration without hardware changes; low VOL (≤0.4 V) ensures robust logic-low detection across 5 V I/O domains. |
Use Scenario: Sharing a single ADC interface among four analog sensor channels in an industrial data acquisition module. IC Role / Device Role / Timing Role: Buffers channel-select signals to ADC control inputs, with nOE driven by sequencer to gate conversion triggers. Use Value: Guarantees monotonic, glitch-free channel selection due to matched propagation delays (<36 ns) across all four buffers. |
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 |
|---|---|---|---|
| SN74HCT125N | Active-LOW enable (nOE), same VCC range and drive strength | Requires inverted enable logic; not drop-in compatible without PCB or firmware change | Select if existing design uses active-LOW control signals and layout cannot accommodate new enable polarity. |
| 74LVC126APW | Lower VCC range (1.65–5.5 V), higher speed (tpd ≤ 2.8 ns @ 3.3 V), but only rated to +85 °C | Not suitable for extended temperature environments; requires level-shifting for 5 V systems | Prefer for 3.3 V portable or low-power systems where speed and quiescent current (<1 μA) outweigh temperature needs. |
Compared with SN74HCT125N and 74LVC126APW, the 74HCT126DB,112 uniquely combines TTL-compatible inputs, industrial temperature rating, and active-HIGH enable in SO14 - making it optimal for retrofitting legacy 5 V industrial controllers without redesigning enable logic or thermal management.
Availability
74HCT126DB,112 is available at Aetrix Electronics and suitable for microcontroller bus interface, memory address latching, and digital signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT126DB,112 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 specializing in high-performance, energy-efficient logic, analog, and discrete components for automotive, industrial, and consumer applications.
The 74HCT126DB,112 belongs to Nexperia's industry-standard 74HCT logic family, designed specifically for robust 5 V TTL-to-CMOS interfacing in harsh environments where reliability, noise immunity, and wide temperature operation are critical.
FAQ
What is the maximum clock frequency supported by the 74HCT126DB,112?
The 74HCT126DB,112 does not operate on a clock; it is an asynchronous buffer. Its usable data rate is governed by propagation delay (≤36 ns) and transition time (≤18 ns), enabling reliable operation on digital buses up to ~15 MHz with proper layout and load management. Timing margins must account for worst-case enable/disable delays during bus arbitration.
Can the 74HCT126DB,112 drive a 100 pF capacitive load?
Yes, but with degraded timing: at CL = 100 pF, propagation delay increases to approximately 50–60 ns (extrapolated from 50 pF data), and output rise/fall times extend beyond 20 ns. For reliable 15 MHz operation, keep total load ≤50 pF including trace and receiver capacitance; add series termination if needed.
Is the 74HCT126DB,112 pin-compatible with the 74HC126DB?
Yes - both share identical SO14 pinout (SOT108-1), same pin functions, and compatible 3-state architecture. However, the 74HC126DB uses CMOS input thresholds (VIH = 3.15 V min @ VCC = 4.5 V), so direct substitution in TTL-driven systems may cause logic misreads unless input voltage levels are verified.
Does the 74HCT126DB,112 require external pull-up or pull-down resistors on nOE pins?
No - nOE inputs have no internal pull resistors and must be actively driven HIGH or LOW. Leaving them floating risks metastability and increased ICC. In systems where enable state defaults to OFF, tie unused nOE pins to GND via 10 kΩ resistors; for default-ON, connect to VCC.
74HCT126DB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 14-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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,112 FAQ
1.How can I place an order for 74HCT126DB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT126DB,112 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,112 reliable?
The price and inventory of 74HCT126DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT126DB,112 is usually 5 days.
3.What payment methods are accepted for 74HCT126DB,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT126DB,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT126DB,112?
74HCT126DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT126DB,112 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,112?
For technical support, including 74HCT126DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT126DB,112 requirements.
6.How does Aetrix verify that 74HCT126DB,112 is sourced from the original manufacturer or authorized distributors?
All 74HCT126DB,112 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,112 meets industry standards.
7.What is the process for return or replacement of 74HCT126DB,112?
All 74HCT126DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT126DB,112, 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,112 part is unused and in its original packaging.
Return procedure for 74HCT126DB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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