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Texas Instruments SN74AHCT126QDRQ1
- Part No.:
- SN74AHCT126QDRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AHCT126QDRQ1.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:7,470
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Product details
Overview
SN74AHCT126QDRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified quadruple bus buffer gate with independent 3-state outputs, operating at 4.5V–5.5V supply, delivering ±8mA drive strength, and supporting TTL-voltage-compatible inputs for signal enable/disable in vehicle control modules.
For engineers reviewing the SN74AHCT126QDRQ1 datasheet, SN74AHCT126QDRQ1 pinout, SN74AHCT126QDRQ1 application, or SN74AHCT126QDRQ1 equivalent, key selection criteria include automotive temperature range (−40°C to +125°C), SOIC-14 package compatibility, 3-state output timing (tPLH/tPHL ≤ 6.5 ns @ 15 pF), and HBM ESD rating of ±2000 V.
Technical Context
This device implements four independent CMOS buffer channels, each with a dedicated output-enable (OE) input controlling high-impedance state entry/exit. Each channel passes logic from A input to Y output when OE is high; all outputs enter high-Z when OE is low.
It features balanced push-pull outputs capable of sourcing/sinking up to ±8 mA at 5 V, TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max), and internal clamp diodes meeting AEC-Q100 CDM Level C4B (±1000 V) and HBM Level 2 (±2000 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation across automotive battery rail variations including cold-crank and load-dump conditions. |
| Output Drive | ±8 mA at 5 V - sufficient to directly drive multiple CMOS inputs or small indicator loads without external buffering. |
| Input Compatibility | TTL-voltage compatible - accepts standard 5-V TTL logic levels (VIH ≥ 2 V, VIL ≤ 0.8 V), enabling seamless interface with legacy automotive controllers. |
| Propagation Delay | tPLH/tPHL ≤ 6.5 ns @ CL = 15 pF - supports reliable data routing in sub-100 MHz digital subsystems such as body control units. |
| Operating Temperature | −40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood and powertrain applications. |
| ESD Rating | HBM ±2000 V, CDM ±1000 V - exceeds automotive ESD robustness standards for assembly and field reliability. |
| Quiescent Current | ICC ≤ 20 μA - minimizes standby power in always-on vehicle modules like door latch controllers. |
Pinout & Package
SN74AHCT126QDRQ1 is supplied in a 14-pin SOIC (D) package measuring 8.7 mm × 6 mm, with gull-wing leads suitable for automated surface-mount assembly and reflow soldering per IPC-J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 2A, 3A, 4A | Buffer Input | Four independent logic inputs accepting TTL-compatible signals; must be terminated to VCC or GND if unused. |
| 1Y, 2Y, 3Y, 4Y | Buffer Output | Four 3-state CMOS outputs; high-Z when corresponding OE is low; capable of ±8 mA drive at 5 V. |
| 1OE, 2OE, 3OE, 4OE | Output Enable | Active-high enables respective buffer; tie to GND via pulldown resistor during power-up/down to ensure default high-Z state. |
| VCC (Pin 14) | Power Supply | 5-V nominal supply; requires local 0.1-μF bypass capacitor placed adjacent to pin for noise suppression. |
| GND (Pin 7) | Ground Reference | Common return path for all channels; connects to system ground plane to minimize switching noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C operation with full electrical testing across temperature, ensuring reliability in engine bay and transmission control environments. |
| Independent 3-state control per channel | Enables selective bus isolation without affecting other active channels - critical for multiplexed sensor data routing in ADAS domain controllers. |
| TTL-compatible inputs | Eliminates need for level-shifting circuitry when interfacing with older microcontrollers or discrete logic in legacy automotive ECUs. |
| Wettable flank option (BQA variant) | Supports automated optical inspection (AOI) of solder joints - though SN74AHCT126QDRQ1 uses SOIC, this feature is available in pin-compatible WQFN variant for high-reliability production lines. |
| Clamp diode protection | Integrated negative-input and bidirectional-output clamping diodes limit transient overvoltage to safe levels per AEC-Q100 stress test protocols. |
Applications
| Body Control Module Signal Routing | Instrument Cluster LED Driver Interface |
|---|---|
Use Scenario: Isolating and enabling/disabling communication lines between door module microcontrollers and central body control unit. IC Role / Device Role / Timing Role: Bus buffer with per-channel 3-state control acts as programmable signal gate, preventing bus contention during firmware updates or fault recovery. Use Value: Enables dynamic reconfiguration of LIN/CAN peripheral interconnects using only GPIO-controlled OE pins - no additional logic or FPGA resources required. | Use Scenario: Driving multiple status LEDs (e.g., seatbelt, airbag, ABS warnings) from a shared MCU port with current limiting handled externally. IC Role / Device Role / Timing Role: Level-translating buffer providing TTL-compatible input acceptance and ±8 mA output drive to sink/source LED currents without loading MCU I/O pins. Use Value: Reduces MCU GPIO count by 4× while maintaining fast turn-on/off response (<6.5 ns propagation) for real-time warning indication. |
| Switch Debounce Circuitry | Noise-Immune Sensor Signal Conditioning |
Use Scenario: Cleaning mechanical switch bounce in ignition key detection or gear selector position sensing circuits. IC Role / Device Role / Timing Role: Buffer with controlled rise/fall times and input hysteresis-equivalent behavior due to TTL-compatible thresholds suppresses false transitions caused by contact chatter. Use Value: Eliminates need for RC filters or software debouncing delays, reducing BOM cost and improving response time to <10 ns jitter margin. | Use Scenario: Conditioning slow-rising or noisy analog-comparator outputs before feeding into safety-critical watchdog or diagnostic logic. IC Role / Device Role / Timing Role: Signal conditioner that rejects sub-20 ns/V input transients while passing valid logic edges - leveraging specified ∆t/∆v = 20 ns/V minimum transition rate. Use Value: Prevents spurious resets or false fault flags in powertrain control units exposed to EMI-rich environments near ignition systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT125QDRQ1 | Inverting buffer (A → Y̅); identical supply, drive, temp, and packaging specs. | Requires logic inversion in signal path; unsuitable where polarity must be preserved. | Select when signal inversion is acceptable or desired for level alignment with downstream logic. |
| SN74LVC126AQDR | Lower voltage (1.65–3.6 V), non-automotive grade, LVTTL-compatible inputs, ±24 mA drive. | Not AEC-Q100 qualified; limited to cabin electronics or infotainment subsystems with regulated 3.3-V rails. | Choose only for non-safety-critical interior modules where cost and lower voltage operation outweigh qualification needs. |
Compared with SN74AHCT126QDRQ1, SN74AHCT125QDRQ1 provides identical automotive qualification and timing but inverts logic, while SN74LVC126AQDR trades qualification and 5-V compatibility for higher drive and lower voltage support - making SN74AHCT126QDRQ1 the sole choice for 5-V, Grade 1-compliant, non-inverting bus gating.
Availability
SN74AHCT126QDRQ1 is available at Aetrix Electronics and suitable for automotive body control modules, instrument cluster interfaces, switch debounce circuits, and noise-immune sensor conditioning requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN74AHCT126QDRQ1 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-grade logic solutions with over 50 years of automotive qualification experience.
The SN74AHCT126QDRQ1 belongs to TI's automotive-qualified AHCT logic family, designed specifically for robust, low-power, 5-V signal routing in safety-critical vehicle subsystems where reliability across extreme temperatures is mandatory.
FAQ
What is the maximum capacitive load SN74AHCT126QDRQ1 can drive while maintaining specified timing?
SN74AHCT126QDRQ1 is characterized for loads up to 50 pF, with guaranteed switching performance (e.g., tPLH ≤ 8.5 ns) at that capacitance. Driving larger loads increases propagation delay and may cause signal integrity issues; for >50 pF, verify timing margins in-system and consider adding series termination or buffer staging. The SN74AHCT126QDRQ1 datasheet specifies CL = 15 pF and CL = 50 pF test conditions explicitly.
Does SN74AHCT126QDRQ1 require external pull-up or pull-down resistors on unused inputs?
Yes - all unused inputs of SN74AHCT126QDRQ1 must be tied to either VCC or GND to prevent floating states that cause excessive current draw, oscillation, or undefined output behavior. A 10-kΩ resistor is recommended for pull-up/pull-down; direct connection is acceptable if the signal source is permanently inactive. This requirement is specified in Section 5.3 and Application Note SCBA004.
Can SN74AHCT126QDRQ1 outputs be paralleled for higher current drive?
Yes - two or more outputs of SN74AHCT126QDRQ1 with identical inputs and OE states can be safely paralleled to increase total sink/source capability beyond ±8 mA, provided they share the same load node and are not driven to opposite logic states. This technique is documented in Section 8.2.1.3 and leverages the device's balanced CMOS output structure.
Is SN74AHCT126QDRQ1 pin-compatible with non-automotive SN74AHCT126 variants?
Yes - SN74AHCT126QDRQ1 shares identical pinout, electrical characteristics, and functional behavior with commercial-grade SN74AHCT126DR, differing only in AEC-Q100 qualification testing, extended temperature screening, and enhanced traceability. PCB designs using the commercial part can migrate directly to SN74AHCT126QDRQ1 without layout changes.
What thermal considerations apply to SN74AHCT126QDRQ1 in continuous operation?
SN74AHCT126QDRQ1 has RθJA = 124.6°C/W in SOIC-14 package; at maximum ICC (20 μA) and worst-case IOL/IOH (±8 mA), power dissipation remains below 50 mW, resulting in negligible junction temperature rise in typical ambient conditions. Thermal design focus should prioritize PCB copper area under GND/VCC pins rather than heatsinking - as confirmed in Section 5.4 and Layout Example Figure 8-3.
SN74AHCT126QDRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 14-SOIC (0.154", 3.90mm 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74AHCT126QDRQ1 FAQ
1.How can I place an order for SN74AHCT126QDRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT126QDRQ1 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 SN74AHCT126QDRQ1 reliable?
The price and inventory of SN74AHCT126QDRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT126QDRQ1 is usually 5 days.
3.What payment methods are accepted for SN74AHCT126QDRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT126QDRQ1 transactions.
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4.How is shipping managed for SN74AHCT126QDRQ1?
SN74AHCT126QDRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT126QDRQ1 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 SN74AHCT126QDRQ1?
For technical support, including SN74AHCT126QDRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT126QDRQ1 requirements.
6.How does Aetrix verify that SN74AHCT126QDRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT126QDRQ1 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 SN74AHCT126QDRQ1 meets industry standards.
7.What is the process for return or replacement of SN74AHCT126QDRQ1?
All SN74AHCT126QDRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT126QDRQ1, 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 SN74AHCT126QDRQ1 part is unused and in its original packaging.
Return procedure for SN74AHCT126QDRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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