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Nexperia USA Inc. 74AHC126BQ,115
- Part No.:
- 74AHC126BQ,115
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 14-VFQFN Exposed Pad
- Datasheet:
-
74AHC126BQ,115.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14DHVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,344
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Product details
Overview
74AHC126BQ,115 from Nexperia is a quad non-inverting 3-state buffer/line driver in DHVQFN14 package, operating from 2.0 V to 5.5 V, with CMOS-level inputs, balanced propagation delays (≤7.0 ns at VCC = 5.5 V, CL = 15 pF), and overvoltage-tolerant inputs enabling mixed-voltage interfacing in industrial control backplanes.
For engineers reviewing the 74AHC126BQ,115 datasheet, 74AHC126BQ,115 pinout, 74AHC126BQ,115 application, or 74AHC126BQ,115 equivalent, this device is selected for level translation between 3.3 V logic domains and legacy 5 V systems, high-density PCB routing where thermal-enhanced QFN packaging is critical, and low-power bus buffering requiring <2.0 μA ICC at 5.5 V.
Technical Context
The 74AHC126BQ implements four independent non-inverting buffers, each with an active-HIGH output enable (nOE) controlling high-impedance tri-state output behavior. Its Schmitt-trigger input action ensures noise immunity on slow-rising signals, while overvoltage tolerance (VI up to 7.0 V) allows safe interfacing with higher-voltage sources without level shifters.
All four channels share a common VCC (2.0–5.5 V) and GND rail. Input thresholds are CMOS-compatible (VIH = 3.85 V min at VCC = 5.5 V; VIL = 1.65 V max), and outputs drive ±8 mA with VOH ≥ 3.70 V and VOL ≤ 0.55 V under full load-enabling direct connection to standard TTL and CMOS loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.0 V to 5.5 V - supports dual-rail system integration and brown-out resilience down to 2.0 V logic operation. |
| Propagation Delay | ≤5.5 ns (VCC = 5.5 V, CL = 15 pF) - enables reliable timing in 100+ MHz bus applications with tight skew budgets. |
| Output Drive | ±8 mA - sufficient to drive 50 Ω transmission lines or fan-out to 10+ LS-TTL loads without external buffers. |
| Input Voltage Range | -0.5 V to +7.0 V - permits safe interfacing with 5 V or 12 V control signals while powered from 3.3 V rails. |
| Operating Temperature | -40 °C to +125 °C - qualified for extended industrial environments including motor drives and power supply controllers. |
| ESD Protection | HBM >2000 V, CDM >1000 V - reduces field failure risk in automated assembly and handling without additional protection circuitry. |
| Power Dissipation | 500 mW max (Tamb ≤ 98 °C) - enabled by DHVQFN thermal pad; derates 9.6 mW/K above 98 °C for sustained high-load operation. |
Pinout & Package
DHVQFN14 (SOT762-1) package: 2.5 × 3.0 × 0.85 mm body, no leads, exposed thermal pad (non-soldered or floating GND), 14 terminals, pin 1 index area marked.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Output enable input 1 | Active-HIGH control for channel 1 output; asserts high-impedance state when LOW, enabling bus sharing. |
| 1A | Data input 1 | CMOS-level buffered input; accepts overvoltage up to 7.0 V regardless of VCC setting. |
| 1Y | Data output 1 | Non-inverting buffered output; sinks or sources up to 8 mA with rail-to-rail swing capability. |
| 2OE | Output enable input 2 | Independent enable for channel 2; allows selective activation of individual drivers in multi-drop configurations. |
| 2A | Data input 2 | Electrically identical to 1A; supports asynchronous signal conditioning across four isolated paths. |
| 2Y | Data output 2 | Matches 1Y electrical specs; enables parallel data path expansion without timing skew penalties. |
| GND | Ground reference | 0 V return for all I/O and supply currents; thermal pad may be left floating or connected to GND plane. |
| 3Y | Data output 3 | Third buffered output; shares same VIH/VIL thresholds and drive strength as other Y pins. |
| 3A | Data input 3 | Third independent input; Schmitt-trigger action rejects noise below 0.5 V hysteresis threshold. |
| 3OE | Output enable input 3 | Enables/disables 3Y independently; supports partial bus activation in power-aware designs. |
| 4Y | Data output 4 | Final output channel; maintains <1 ns inter-channel skew under matched load conditions. |
| 4A | Data input 4 | Fourth CMOS input; validated for Δt/ΔV ≤20 ns/V transition rates at 5.5 V supply. |
| 4OE | Output enable input 4 | Full channel disable control; used in hot-swap or dynamic reconfiguration sequences. |
| VCC | Supply voltage | Primary power rail; decoupling required within 3 mm of pin 14 due to QFN high-frequency impedance profile. |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger inputs | Provides ≥0.5 V hysteresis to reject noise on slow or noisy control lines-critical for industrial sensor interface reliability. |
| Overvoltage-tolerant inputs | Accepts up to +7.0 V regardless of VCC (2.0–5.5 V), eliminating need for external level translators in mixed-voltage backplanes. |
| Balanced propagation delays | tpd variation ≤0.5 ns between channels ensures deterministic timing alignment in parallel data paths. |
| DHVQFN thermal enhancement | 0.85 mm profile with exposed pad delivers 2× lower θJA vs. TSSOP, supporting 500 mW dissipation at +98 °C ambient. |
| Wide temperature range | Specified from -40 °C to +125 °C - validated for use in automotive engine compartments and industrial PLC modules. |
Applications
| Industrial Backplane Buffering | Legacy System Level Translation |
|---|---|
|
Use Scenario: Isolating and driving address/data buses between modern 3.3 V microcontrollers and legacy 5 V peripheral cards in modular PLC racks. IC Role / Device Role / Timing Role: Quad buffer provides independent enable control per bus segment, minimizing contention during hot-swap events. Use Value: Overvoltage-tolerant inputs eliminate discrete level-shifter ICs, reducing BOM count by 4 parts per slot and saving 12 mm² PCB area. |
Use Scenario: Interfacing FPGA I/O banks (3.3 V LVTTL) with older 5 V RS-232 transceivers and EEPROMs in test equipment. IC Role / Device Role / Timing Role: Acts as unidirectional voltage translator with sub-6 ns delay, preserving setup/hold margins for 25 MHz serial clocks. Use Value: CMOS input thresholds and 8 mA drive ensure clean signal edges into capacitive 5 V loads without overshoot or ringing. |
| High-Density Sensor Hub Interface | Low-Power Bus Isolation |
|
Use Scenario: Aggregating analog sensor outputs (conditioned by external ADCs) onto a shared SPI bus in compact environmental monitoring nodes. IC Role / Device Role / Timing Role: Buffers multiplexed digital status flags and calibration data streams, with per-channel OE enabling time-division multiplexing. Use Value: 2.0 μA ICC at 5.5 V and 25 °C extends battery life in wireless sensor nodes by >18 months versus standard 74HC variants. |
Use Scenario: Preventing ground loop currents and noise coupling between isolated power domains in medical diagnostic imaging subsystems. IC Role / Device Role / Timing Role: Provides galvanically isolated signal path via 3-state outputs, controlled by isolated enable signals from optocouplers. Use Value: High-impedance OFF-state leakage <±0.25 μA at VCC = 5.5 V ensures <1 nA cross-domain leakage-meeting IEC 60601 creepage 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 |
|---|---|---|---|
| 74AHCT126BQ,115 | TTL-compatible inputs (VIH = 2.0 V min), slightly higher ICC (≤40 μA), identical pinout and timing. | Better suited for interfacing with legacy 5 V TTL logic families where input threshold compatibility is mandatory. | Select when driving from 74LS or 74F series outputs; avoid if interfacing with 1.8 V or 2.5 V CMOS sources. |
| SN74LVC126APWR | Lower VCC range (1.65–3.6 V), smaller TSSOP14 package, 24 mA drive, but no overvoltage tolerance (VI max = VCC + 0.3 V). | Optimized for ultra-low-voltage portable systems; unsuitable for mixed-voltage translation above 3.6 V. | Choose only for 3.3 V-only designs requiring higher drive strength; requires external clamping for >3.6 V inputs. |
Compared with 74AHCT126BQ,115, the AHC variant offers superior noise margin in CMOS systems and lower static current; versus SN74LVC126APWR, it trades off voltage scalability for robustness in heterogeneous voltage environments-making it the sole choice for 2.0–5.5 V interoperability with legacy interfaces.
Availability
74AHC126BQ,115 is available at Aetrix Electronics and suitable for industrial automation backplanes, medical device sensor hubs, test equipment level translation, and embedded control systems requiring stable component supply across extended temperature ranges.
Supply support for 74AHC126BQ,115 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 high-volume, high-reliability logic, analog, and MOSFET solutions for industrial, automotive, and computing markets.
The 74AHC logic family targets high-speed, low-power, mixed-voltage digital interfacing-designed specifically for robust signal integrity in space-constrained, thermally demanding embedded systems.
FAQ
Can the 74AHC126BQ,115 operate reliably at 2.0 V supply?
Yes. The device is fully specified down to 2.0 V VCC, with guaranteed VIH ≥1.5 V and VOL ≤0.5 V at 4.0 mA load. Propagation delay increases to ≤10.0 ns (CL = 15 pF), but all DC and AC parameters remain valid across the full -40 °C to +125 °C range.
Is the exposed thermal pad on the DHVQFN14 package required to be soldered?
No. Per Nexperia documentation, the thermal pad has no electrical or mechanical requirement to be soldered. If connected, it must remain electrically floating or tied to GND-never to VCC or signal nets-to prevent parasitic coupling and thermal stress fractures.
What is the maximum input transition rate supported without causing logic errors?
The device supports input rise/fall rates as slow as 20 ns/V at VCC = 5.5 V, meaning a 5.5 V transition can take up to 110 ns without violating timing margins. Schmitt-trigger inputs ensure correct sampling even with edge rates slower than 100 ns.
Does the 74AHC126BQ,115 support hot-swap insertion into a live backplane?
Yes-its overvoltage-tolerant inputs (VI = -0.5 V to +7.0 V) and high-impedance OFF-state (IOZ ≤ ±0.25 μA) allow safe insertion while VCC is absent or ramping. However, VCC must stabilize before asserting any nOE or applying input signals to avoid transient latch-up.
74AHC126BQ,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74AHC
- Package/Case:
- 14-VFQFN Exposed Pad
- 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:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-DHVQFN (2.5x3)
74AHC126BQ,115 FAQ
1.How can I place an order for 74AHC126BQ,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHC126BQ,115 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 74AHC126BQ,115 reliable?
The price and inventory of 74AHC126BQ,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHC126BQ,115 is usually 5 days.
3.What payment methods are accepted for 74AHC126BQ,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHC126BQ,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHC126BQ,115?
74AHC126BQ,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHC126BQ,115 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 74AHC126BQ,115?
For technical support, including 74AHC126BQ,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHC126BQ,115 requirements.
6.How does Aetrix verify that 74AHC126BQ,115 is sourced from the original manufacturer or authorized distributors?
All 74AHC126BQ,115 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 74AHC126BQ,115 meets industry standards.
7.What is the process for return or replacement of 74AHC126BQ,115?
All 74AHC126BQ,115 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHC126BQ,115, 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 74AHC126BQ,115 part is unused and in its original packaging.
Return procedure for 74AHC126BQ,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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