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Nexperia USA Inc. 74HC126DB,118
- Part No.:
- 74HC126DB,118
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 14-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HC126DB,118.pdf
- Description:
- IC BUFFER NON-INVERT 6V 14SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,805
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Product details
Overview
74HC126DB,118 from Nexperia is a quad 3-state buffer/line driver in SO14 (SOT108-1) package, operating from 2.0 V to 6.0 V supply, with CMOS-level inputs, 14 ns typical propagation delay at 4.5 V, and -40 °C to +125 °C temperature range - used for bidirectional bus interfacing and signal isolation in industrial control logic.
For engineers reviewing the 74HC126DB,118 datasheet, 74HC126DB,118 pinout, 74HC126DB,118 application, or 74HC126DB,118 equivalent, key selection criteria include 3-state enable timing (15 ns enable/disable), input clamp diode support for overvoltage-tolerant interfacing, high noise immunity (>40% VCC), and SO14 package compatibility with legacy 74-series PCB footprints.
Technical Context
This device implements four independent non-inverting buffers, each with an active-HIGH output enable (nOE) controlling high-impedance OFF-state. Input clamp diodes allow safe interfacing to signals exceeding VCC when used with current-limiting resistors.
It complies with JEDEC JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V), supports TTL-compatible operation via the 74HCT126 variant, and meets HBM ESD >2000 V and CDM >1000 V per JS-001/JS-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - enables direct interface with 3.3 V and 5 V logic domains without level shifters. |
| Propagation Delay (tpd) | 11 ns typ @ VCC = 4.5 V, CL = 50 pF - ensures sub-20 ns timing margin for 25 MHz synchronous bus operation. |
| Enable/Disable Time (ten/tdis) | 15 ns typ @ VCC = 4.5 V - guarantees clean bus release before next data cycle in shared-bus systems. |
| Output Drive Strength | ±6.0 mA @ VCC = 4.5 V - sufficient to drive 10 LSTTL loads or 50 pF traces without external buffering. |
| Input Clamp Diodes | Integrated - permits safe connection of inputs to voltages up to VCC + 0.5 V using series current-limiting resistors. |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood industrial and extended-temperature embedded applications. |
| Power Dissipation (Ptot) | 500 mW max @ Tamb ≤ 100 °C (SO14) - supports continuous operation in compact enclosures with minimal heatsinking. |
Pinout & Package
74HC126DB,118 uses the SO14 (SOT108-1) plastic small outline package: 14-pin, 3.9 mm body width, 1.27 mm lead pitch, gull-wing leads, JEDEC MS-012 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | nOE (1OE–4OE) | Active-HIGH output enable inputs - each controls one buffer's 3-state output independently. |
| 2, 5, 9, 12 | nA (1A–4A) | Buffer input terminals - accept CMOS-level signals; clamped to GND/VCC for overvoltage tolerance. |
| 3, 6, 8, 11 | nY (1Y–4Y) | Non-inverting buffered outputs - enter high-impedance state when corresponding nOE = LOW. |
| 7 | GND | Ground reference (0 V) - must be low-inductance connection to minimize switching noise coupling. |
| 14 | VCC | Positive supply rail - requires local 100 nF ceramic decoupling capacitor placed within 5 mm. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 2.0–6.0 V operation allows single-supply compatibility across 3.3 V microcontrollers and 5 V legacy peripherals. |
| CMOS-Level Inputs | VIH ≥ 3.15 V @ VCC = 4.5 V - ensures robust noise margin (>1.3 V) against ground bounce and crosstalk. |
| High-Noise Immunity | Typical noise margin >40% of VCC - prevents false triggering in electrically noisy factory-floor environments. |
| Latch-Up Resistance | Exceeds 100 mA per JESD78 Class II Level B - eliminates risk of destructive latch-up during transient overvoltage events. |
| ESD Protection | HBM >2000 V, CDM >1000 V - reduces need for external ESD protection on board-level I/O lines. |
Applications
| Industrial PLC Backplane Interface | Microcontroller GPIO Expansion |
|---|---|
|
Use Scenario: Isolating and driving address/data lines between CPU module and modular I/O cards in a DIN-rail mounted PLC chassis. IC Role / Device Role / Timing Role: Quad buffer provides direction-controlled, 3-state-enabled signal routing between isolated voltage domains while preventing bus contention. Use Value: Enables hot-swap-safe card insertion by ensuring all outputs default to high-Z until firmware initializes enable lines. |
Use Scenario: Expanding GPIO count of an ARM Cortex-M4 MCU to drive 16-bit parallel LCD interface with separate read/write strobes. IC Role / Device Role / Timing Role: Buffers isolate MCU pins from capacitive LCD bus load; 3-state control synchronizes with display controller RD/WR timing. Use Value: Eliminates timing skew between data bits by matching propagation delays across all four channels (≤2 ns variation). |
| Legacy Bus Signal Conditioning | Test Equipment Digital Pattern Generator |
|
Use Scenario: Level-shifting and fan-out buffering between 5 V TTL logic and modern 3.3 V FPGA I/O banks in retro-computing hardware restoration. IC Role / Device Role / Timing Role: Acts as bidirectional bus transceiver element with independent enable control per channel for half-duplex protocols. Use Value: Clamp diodes permit safe connection to 5.5 V test signals without external diodes, reducing BOM count and layout area. |
Use Scenario: Driving calibrated digital stimulus waveforms into DUT inputs during automated functional test of mixed-signal ASICs. IC Role / Device Role / Timing Role: Provides precise, low-jitter edge alignment across multiple channels using matched internal gate delays. Use Value: 11 ns tpd and 5 ns tt ensure <1 ns inter-channel skew at 20 MHz, critical for setup/hold compliance verification. |
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 |
|---|---|---|---|
| 74HCT126DB,118 | TTL-compatible inputs (VIH = 2.0 V min @ VCC = 4.5 V); identical SO14 package and timing. | Better suited for interfacing with legacy 5 V TTL outputs without pull-ups. | Select when driving from standard 5 V TTL sources; otherwise 74HC126DB,118 offers superior noise margin with CMOS inputs. |
| SN74LVC126APW | Lower VCC range (1.65–3.6 V); 3.3 V only; 3.7 ns tpd; TSSOP14 package (SOT402-1). | Optimized for modern low-voltage portable systems; not pin-compatible with SO14 footprint. | Choose only for new 3.3 V designs requiring faster speed and smaller size; requires PCB redesign. |
Compared with 74HCT126DB,118, the 74HC126DB,118 provides higher input noise immunity but lacks TTL-level compatibility; versus SN74LVC126APW, it trades speed and voltage scalability for broader supply flexibility and drop-in SO14 replacement capability in legacy systems.
Availability
74HC126DB,118 is available at Aetrix Electronics and suitable for industrial PLC backplanes, microcontroller GPIO expansion, and legacy bus signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HC126DB,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 focused on essential efficiency technologies, delivering high-performance logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74HC126 belongs to Nexperia's industry-standard 74HC logic family, designed for reliable, low-power, pin-compatible upgrades of legacy TTL and earlier CMOS logic in space-constrained and thermally demanding applications.
FAQ
What is the maximum clock frequency supported by 74HC126DB,118?
The 74HC126DB,118 is not a clocked device but a combinational buffer. Its usable data rate depends on propagation delay and system timing margins: at 4.5 V, tpd = 11 ns typ, supporting reliable operation up to ~25 MHz for simple bus handshaking with adequate setup/hold time. No internal clock circuitry exists.
Can 74HC126DB,118 drive a 50 Ω transmission line directly?
No - its ±6.0 mA output drive at 4.5 V yields ~750 Ω effective source impedance, unsuitable for 50 Ω line matching. It is intended for point-to-point or multidrop bus loading (≤10 LSTTL or ≤50 pF), not RF transmission line driving. Use dedicated line drivers for 50 Ω applications.
Does 74HC126DB,118 support hot-swap insertion?
Yes - its input clamp diodes and 3-state outputs enable safe hot-swap operation when enable lines are held inactive (LOW) during insertion. However, VCC sequencing must ensure power is applied before signal inputs to avoid forward-biasing clamps, per datasheet Section 7 limiting values.
How does the 74HC126DB,118 differ from the 74HC125?
The 74HC126DB,118 features non-inverting buffers (A → Y), while the 74HC125 contains inverting buffers (A → Y̅). Both share identical pinout, 3-state control, supply range, and timing. Functional substitution requires logic inversion in upstream/downstream circuitry.
74HC126DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HC
- Package/Case:
- 14-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SSOP
74HC126DB,118 FAQ
1.How can I place an order for 74HC126DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC126DB,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 74HC126DB,118 reliable?
The price and inventory of 74HC126DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC126DB,118 is usually 5 days.
3.What payment methods are accepted for 74HC126DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC126DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC126DB,118?
74HC126DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC126DB,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 74HC126DB,118?
For technical support, including 74HC126DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC126DB,118 requirements.
6.How does Aetrix verify that 74HC126DB,118 is sourced from the original manufacturer or authorized distributors?
All 74HC126DB,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 74HC126DB,118 meets industry standards.
7.What is the process for return or replacement of 74HC126DB,118?
All 74HC126DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC126DB,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 74HC126DB,118 part is unused and in its original packaging.
Return procedure for 74HC126DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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