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Texas Instruments SN74AHC126QPWRQ1
- Part No.:
- SN74AHC126QPWRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC126QPWRQ1.pdf
- Description:
- AUTOMOTIVE FOUR-CHANNEL2-V TO 5.
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SN74AHC126QPWRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified quadruple bus buffer gate with independent 3-state outputs, operating from 2 V to 5.5 V, delivering 4.3 ns typical propagation delay at 5 V, and supporting −40°C to +125°C ambient operation for engine control and body electronics signal routing.
For engineers reviewing the SN74AHC126QPWRQ1 datasheet, SN74AHC126QPWRQ1 pinout, SN74AHC126QPWRQ1 application, or SN74AHC126QPWRQ1 equivalent, key selection criteria include 3-state output timing consistency across voltage/temperature, latch-up immunity (>250 mA), HBM/CDM ESD robustness (±2 kV / ±1 kV), and wettable-flank QFN compatibility with automated optical inspection in high-reliability automotive PCB assembly.
Technical Context
This device implements four independent positive-logic buffers (Y = A) with separate output-enable (OE) inputs per channel, enabling selective signal gating without bus contention. Each output supports true 3-state operation-high drive, low drive, and high-impedance-with balanced sourcing/sinking capability up to ±8 mA at 5 V.
Input structure follows standard CMOS topology with ≤10 pF input capacitance and ±1 μA leakage; output stage includes integrated clamp diodes for transient protection. The design enforces fast input transition requirements (≤20 ns/V at 5 V) to prevent shoot-through and oscillation in automotive noise environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports direct interface with 3.3 V and 5 V logic domains without level shifters |
| Propagation Delay (tPD) | 4.3 ns typical at 5 V, 15 pF - enables reliable timing in sub-100 MHz digital control paths |
| Output Drive (IOH/IOL) | ±8 mA at 5 V - sufficient to drive multiple CMOS loads or short transmission lines without external buffering |
| Operating Temperature | −40°C to +125°C - qualified for under-hood and cabin ECUs per AEC-Q100 Grade 1 |
| ESD Rating (HBM/CDM) | ±2000 V / ±1000 V - meets automotive system-level ESD immunity requirements per ISO 10605 |
| Input Capacitance (Ci) | 10 pF max - minimizes loading on upstream drivers and preserves signal edge integrity |
| Latch-up Immunity | >250 mA per JESD17 - prevents destructive latch-up during power sequencing or fault transients |
Pinout & Package
SN74AHC126QPWRQ1 is supplied in a 14-pin TSSOP (PW) package measuring 5 mm × 6.4 mm with 0.65 mm lead pitch. The package features gull-wing leads compatible with standard reflow and AOI processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE–4OE | Independent output enable inputs | Active-low control per channel; allows dynamic bus isolation without affecting other channels |
| 1A–4A | Buffer input terminals | CMOS-compatible inputs accepting 0–VCC logic levels; require termination to VCC/GND when unused |
| 1Y–4Y | 3-state buffered outputs | Push-pull outputs with high-impedance state; support parallel connection of same-channel outputs for increased drive |
| VCC (Pin 14) | Positive supply | Must be decoupled with 0.1 µF capacitor placed adjacent to pin; supplies all four channels |
| GND (Pin 7) | Ground reference | Common return path for all outputs and internal logic; requires low-impedance PCB plane connection |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use from −40°C to +125°C ambient, including temperature cycling and lifetime reliability testing |
| Wettable flank QFN option (BQA) | Enables reliable solder joint inspection via AOI; not applicable to PW package but confirms TI's automotive process rigor |
| Balanced 3-state outputs | Sinks and sources equal current (±8 mA @ 5 V), eliminating asymmetry in bus turn-off timing critical for CAN/LIN interface isolation |
| Low dynamic power consumption | 14 pF power dissipation capacitance - reduces switching current and thermal load in always-on modules like gateway controllers |
| Clamp diode protection | Integrated input/output clamps limit transient overvoltage to ±0.5 V beyond rails, enhancing resilience against load dump and inductive kickback |
Applications
| Engine Control Unit (ECU) Signal Isolation | Body Control Module (BCM) LED Driver Interface |
|---|---|
Use Scenario: Isolating sensor data buses during ECU power-up/down sequences to prevent metastability in downstream ADCs or microcontrollers. IC Role / Device Role / Timing Role: Bus buffer with controlled 3-state activation; OE pins synchronized to power-good signals to enforce clean bus release timing. Use Value: Eliminates bus contention and false triggering during cold-start sequences where supply ramps slowly across multiple voltage domains. | Use Scenario: Driving multiplexed indicator LEDs in instrument clusters with shared segment lines and individual digit enables. IC Role / Device Role / Timing Role: Level-shifting and current-boosting buffer; converts low-drive MCU GPIO outputs into robust 8 mA sink/source signals for LED segments. Use Value: Enables uniform LED brightness across 12 V and 5 V supply zones while maintaining <10 ns inter-channel skew for flicker-free display updates. |
| Automotive LIN Transceiver Interface | Transmission Line Signal Conditioning |
Use Scenario: Buffering and enabling LIN bus signals between microcontroller UART and physical transceiver to manage bus arbitration and sleep/wake transitions. IC Role / Device Role / Timing Role: Direction-controlled signal gate; OE tied to MCU-controlled LIN controller enable to isolate transceiver during standby. Use Value: Prevents LIN bus leakage current during sleep mode, meeting ISO 17987-4 quiescent current requirements (<30 µA). | Use Scenario: Driving long PCB traces (>12 cm) between ADAS domain controllers and camera or radar sensors to maintain signal integrity. IC Role / Device Role / Timing Role: Transmission line driver with series-damping resistor support; outputs configured as active-low enables for controlled edge rate. Use Value: Reduces ringing and overshoot by 60% compared to direct drive, verified with 15–50 pF capacitive loads and 50 Ω trace impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC126AQPWRQ1 | Lower VCC range (1.65–5.5 V); higher IOL (24 mA @ 3.3 V); slightly slower tPD (5.2 ns @ 3.3 V) | Better suited for mixed-voltage 1.8 V/3.3 V systems; less margin for 5 V-only designs | Select when interfacing with modern low-voltage MCUs and requiring higher sink current |
| MC74VHC126DTG | Non-automotive grade; wider industrial temp range (−40°C to +105°C); no AEC-Q100 certification | Not qualified for safety-critical vehicle functions; lacks automotive ESD/latch-up validation | Acceptable for non-safety automotive accessories or industrial control where AEC-Q100 is not mandated |
Compared with SN74LVC126AQPWRQ1 and MC74VHC126DTG, SN74AHC126QPWRQ1 provides optimal balance of speed, 5 V compatibility, and full AEC-Q100 Grade 1 compliance - making it the preferred choice for powertrain and chassis control modules requiring guaranteed performance across extended temperature and ESD stress conditions.
Availability
SN74AHC126QPWRQ1 is available at Aetrix Electronics and suitable for engine control units, body control modules, and ADAS domain controllers requiring stable component supply with automotive-grade traceability and long-term lifecycle support.
Supply support for SN74AHC126QPWRQ1 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and automotive ICs, with decades of experience in high-reliability automotive electronics design and manufacturing.
The SN74AHC126QPWRQ1 belongs to TI's AHC logic family optimized for low-power, high-speed automotive signal routing - engineered specifically to meet stringent AEC-Q100 requirements while maintaining pin-to-function compatibility with legacy 74-series logic in next-generation vehicle architectures.
FAQ
What is the maximum capacitive load SN74AHC126QPWRQ1 can drive while maintaining specified timing?
SN74AHC126QPWRQ1 is characterized for loads up to 50 pF across all operating conditions. At 5 V and 25°C, propagation delay remains within specification (tPLH/tPHL ≤ 6.5 ns) with 50 pF load and 15 pF test fixture capacitance. Driving >50 pF increases delay nonlinearly and may degrade noise margins; TI recommends limiting total load to 50 pF for guaranteed timing compliance in automotive applications. SN74AHC126QPWRQ1 datasheet Section 6.6 and 6.7 provide full CL-dependent timing tables.
Can SN74AHC126QPWRQ1 outputs be paralleled for higher current drive?
Yes - SN74AHC126QPWRQ1 allows paralleling of outputs from the same channel (e.g., 1Y and 2Y) when driven by identical inputs and OE states, increasing effective sink/source capability to ±16 mA at 5 V. This is explicitly supported in TI's application guidance (Section 9.2.1.3). However, outputs from different channels must never be paralleled due to potential timing skew causing shoot-through current. SN74AHC126QPWRQ1 functional modes require strict synchronization of input and OE signals for safe parallel operation.
How should unused inputs be terminated on SN74AHC126QPWRQ1?
All unused inputs on SN74AHC126QPWRQ1 must be terminated to a valid logic level - either VCC or GND - using direct connection or a 10-kΩ pull-up/pull-down resistor. Floating CMOS inputs cause excessive current draw, logic instability, and potential device damage due to partial conduction in input transistors. TI's datasheet Section 6.3 and Application Report SCBA004 mandate this practice. For SN74AHC126QPWRQ1, tying unused OE pins to GND ensures default high-impedance output, while unused A inputs tied to GND fix output low (Y = L) in enabled state.
Does SN74AHC126QPWRQ1 support hot insertion or live insertion into a powered backplane?
No - SN74AHC126QPWRQ1 is not designed for hot insertion. Its absolute maximum ratings specify that VCC must be powered before applying input signals (VI must remain ≤ VCC + 0.5 V), and simultaneous application of VI > VCC or VI < 0 V risks damage via input clamp diode conduction. TI does not characterize or guarantee behavior during live insertion. For backplane applications requiring hot-swap capability, dedicated hot-swap controllers or buffers with power-sequence tolerance (e.g., TI's TPS229xx series) must be used upstream of SN74AHC126QPWRQ1.
What is the purpose of the thermal pad in the BQA package variant, and is it present in SN74AHC126QPWRQ1?
The thermal pad is exclusive to the BQA (WQFN) package variant and is absent in SN74AHC126QPWRQ1, which uses the PW (TSSOP) package. In BQA, the exposed thermal pad improves junction-to-board thermal resistance (RθJB = 56.8°C/W) and should be soldered to a PCB ground plane for optimal thermal performance. SN74AHC126QPWRQ1 has no thermal pad; its RθJB is 94.2°C/W (Section 6.4), and thermal management relies on standard copper pour under the TSSOP body and proper VCC/GND plane connectivity. TI's mechanical drawing SLMA002 confirms PW package construction excludes thermal pad.
SN74AHC126QPWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- 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:
- 2V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
SN74AHC126QPWRQ1 FAQ
1.How can I place an order for SN74AHC126QPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC126QPWRQ1 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 SN74AHC126QPWRQ1 reliable?
The price and inventory of SN74AHC126QPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC126QPWRQ1 is usually 5 days.
3.What payment methods are accepted for SN74AHC126QPWRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC126QPWRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC126QPWRQ1?
SN74AHC126QPWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC126QPWRQ1 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 SN74AHC126QPWRQ1?
For technical support, including SN74AHC126QPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC126QPWRQ1 requirements.
6.How does Aetrix verify that SN74AHC126QPWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74AHC126QPWRQ1 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 SN74AHC126QPWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74AHC126QPWRQ1?
All SN74AHC126QPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC126QPWRQ1, 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 SN74AHC126QPWRQ1 part is unused and in its original packaging.
Return procedure for SN74AHC126QPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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