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Texas Instruments SN74HCS126QPWRQ1
- Part No.:
- SN74HCS126QPWRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HCS126QPWRQ1.pdf
- Description:
- IC BUFFER NON-INVERT 6V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,366
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Product details
Overview
SN74HCS126QPWRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified quadruple buffer IC with Schmitt-trigger inputs and 3-state outputs, operating from 2 V to 6 V supply. It delivers ±7.8-mA output drive at 6 V, features typical ICC of 100 nA, and enables noise-immune signal routing in vehicle body control modules.
For engineers reviewing the SN74HCS126QPWRQ1 datasheet, SN74HCS126QPWRQ1 pinout, SN74HCS126QPWRQ1 application, or SN74HCS126QPWRQ1 equivalent, key selection criteria include its automotive temperature range (–40°C to +125°C), hysteresis-based input noise rejection (ΔVT = 0.6 V min at 6 V), 3-state enable control per channel, and TSSOP-14 package compatibility with high-density PCB layouts.
Technical Context
This device implements four independent positive-logic buffers (Y = A) with individual active-high output-enable (OE) controls. Each channel integrates Schmitt-trigger inputs providing 0.6 V minimum hysteresis at 6 V, enabling robust operation with slow-rising or noisy signals without external debouncing circuitry.
The CMOS architecture supports balanced ±7.8-mA output drive capability at 6 V while maintaining ultra-low static current (100 nA typical ICC). Its 3-state outputs are electrically isolated when OE is low, exhibiting <2 µA off-state leakage and supporting bus-sharing applications in automotive domain controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - supports direct interface with 3.3-V and 5-V automotive microcontrollers and sensors |
| Operating Temperature | –40°C to +125°C - qualified for engine bay and under-hood applications per AEC-Q100 Grade 1 |
| Output Drive | ±7.8 mA at 6 V - sufficient to directly drive LEDs, small relays, or multiple CMOS inputs without buffering |
| Input Hysteresis ΔVT | 0.6 V min at 6 V - rejects noise spikes up to ±300 mV peak-to-peak on input lines |
| Propagation Delay | 7 ns max at 6 V - ensures timing-critical signal conditioning meets automotive CAN/LIN subsystem latency budgets |
| Supply Current ICC | 100 nA typical - enables always-on monitoring circuits with negligible battery drain in sleep modes |
| Input Leakage | ±100 nA max - prevents false triggering from floating inputs in high-impedance sensor interfaces |
Pinout & Package
TSSOP-14 package (5.00 mm × 4.40 mm), lead-free, RoHS-compliant, MSL Level-1, suitable for automated SMT assembly in automotive production environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-high output enable | Controls Hi-Z state per channel independently; allows dynamic bus arbitration without external logic |
| 1A, 2A, 3A, 4A | Buffer input | Schmitt-triggered - accepts slow-switching signals (e.g., mechanical switch closures) without oscillation |
| 1Y, 2Y, 3Y, 4Y | Buffer output | 3-state CMOS - sinks/sourses ±7.8 mA; compatible with 50-pF capacitive loads per TI spec |
| VCC (Pin 14) | Positive supply | Must be decoupled with 0.1-μF capacitor placed adjacent to pin to suppress switching noise |
| GND (Pin 7) | Ground reference | Shared return path for all four channels; requires low-impedance PCB plane for EMI control |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use across –40°C to +125°C ambient, including thermal cycling and vibration testing |
| Schmitt-trigger input hysteresis | 0.6 V minimum at 6 V - eliminates need for external RC filters in switch debounce or sensor signal conditioning |
| Ultra-low ICC | 100 nA typical - extends battery life in always-on vehicle modules such as door latch monitors or seat occupancy sensors |
| 3-state output control | Per-channel OE pins enable time-multiplexed sharing of single data lines among multiple ECUs |
| ESD robustness | HBM Level 2 (±4 kV), CDM Level C4B (±1.5 kV) - withstands handling and in-system electrostatic events in manufacturing and service |
Applications
| Body Control Module Signal Routing | LED Status Indicator Driver |
|---|---|
Use Scenario: Isolating and conditioning digital signals between door module MCUs and central body controller over long harness runs. IC Role / Device Role / Timing Role: Buffer with Schmitt-trigger inputs cleans noisy switch inputs; 3-state outputs prevent bus contention during firmware updates. Use Value: Eliminates external RC filtering and reduces BOM count by integrating noise immunity and bus isolation in one 14-pin TSSOP device. | Use Scenario: Driving status LEDs for HVAC, lighting, or warning indicators in instrument clusters. IC Role / Device Role / Timing Role: Output driver stage with programmable enable per LED channel; supports PWM dimming via OE pin modulation. Use Value: ±7.8-mA drive capability directly powers standard 20-mA LEDs without external transistors, saving board space and cost. |
| Switch Debounce Interface | Noise-Immune Sensor Signal Conditioning |
Use Scenario: Interfacing mechanical door lock switches or ignition key sensors subject to contact bounce and EMI. IC Role / Device Role / Timing Role: Input conditioner converting erratic switch transitions into clean logic-level pulses for MCU GPIO capture. Use Value: Built-in hysteresis removes need for software debouncing routines or external Schmitt-trigger ICs, reducing MCU firmware complexity. | Use Scenario: Conditioning analog sensor outputs (e.g., thermistor voltage dividers) before ADC sampling in climate control systems. IC Role / Device Role / Timing Role: Digital threshold detector with adjustable hysteresis; converts slowly varying analog voltages into stable logic transitions. Use Value: Enables reliable detection of temperature thresholds (e.g., cabin overheat warning) without false triggers from electrical noise on shared vehicle grounds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buffer-with-3-state-output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCS125QPWRQ1 | Inverting buffer (Y = NOT A); identical Schmitt-trigger, 3-state, and automotive specs | Requires logic inversion in signal path; unsuitable where polarity must be preserved | Select only when system design requires inverted output logic |
| SN74LVC126APWRE4 | Non-Schmitt inputs; 1.65–5.5 V supply; higher ICC (10 µA typical); same TSSOP-14 footprint | Lacks noise immunity for slow/noisy signals; not AEC-Q100 qualified | Use only in non-automotive, low-noise environments with fast-rising digital sources |
Compared with SN74HCS126QPWRQ1, SN74HCS125QPWRQ1 preserves all automotive and noise-rejection capabilities but inverts logic, while SN74LVC126APWRE4 sacrifices hysteresis and qualification for broader voltage compatibility and lower cost in commercial applications.
Availability
SN74HCS126QPWRQ1 is available at Aetrix Electronics and suitable for automotive body electronics, infotainment interface conditioning, and ADAS sensor signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74HCS126QPWRQ1 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 company delivering analog and embedded processing solutions for automotive, industrial, and personal electronics markets.
The SN74HCS126QPWRQ1 belongs to TI's automotive-qualified HCS logic family, designed specifically for noise-prone vehicle subsystems requiring robust signal integrity, low power, and guaranteed operation across extreme temperatures.
FAQ
What is the maximum capacitive load SN74HCS126QPWRQ1 can drive while meeting datasheet timing specifications?
The SN74HCS126QPWRQ1 is characterized to meet all switching specifications-including propagation delay (7 ns max at 6 V) and transition time (4 ns max)-with a total output load capacitance ≤50 pF. Exceeding this value increases rise/fall times and may cause timing violations in high-speed interfaces. For heavier loads, add series termination or consider a dedicated line driver IC.
Does SN74HCS126QPWRQ1 require external pull-up or pull-down resistors on unused inputs?
Yes, unused inputs on SN74HCS126QPWRQ1 must be terminated to either VCC or GND to prevent floating states that cause increased ICC and potential logic instability. A 10-kΩ resistor is recommended per TI layout guidelines; direct connection is acceptable if the input is permanently inactive and no dynamic switching is expected.
Can SN74HCS126QPWRQ1 outputs be paralleled for higher current drive?
Yes-two or more outputs of SN74HCS126QPWRQ1 with identical inputs and OE states can be safely paralleled to increase sink/source capability beyond ±7.8 mA. This is explicitly supported in TI's application guidance and maintains timing alignment due to matched internal propagation paths across channels.
What is the purpose of the Schmitt-trigger input hysteresis in SN74HCS126QPWRQ1, and how does it improve system reliability?
The Schmitt-trigger hysteresis (ΔVT ≥0.6 V at 6 V) in SN74HCS126QPWRQ1 prevents multiple output transitions when input signals cross the logic threshold slowly or with noise. This eliminates false triggering in applications like switch interfaces or sensor monitoring, directly improving functional safety and reducing firmware-level debouncing overhead in automotive ECUs.
Is SN74HCS126QPWRQ1 pin-compatible with legacy 74HC126 devices?
No-SN74HCS126QPWRQ1 uses the same TSSOP-14 pinout as standard 74HC126 variants, but its Schmitt-trigger inputs and enhanced ESD/automotive qualifications introduce electrical differences. While physical layout may be reused, system validation is required due to distinct input threshold behavior, hysteresis, and AEC-Q100 stress test compliance.
SN74HCS126QPWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCS
- 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:
- Schmitt Trigger
- Output Type:
- 3-State
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
SN74HCS126QPWRQ1 FAQ
1.How can I place an order for SN74HCS126QPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCS126QPWRQ1 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 SN74HCS126QPWRQ1 reliable?
The price and inventory of SN74HCS126QPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCS126QPWRQ1 is usually 5 days.
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Once your SN74HCS126QPWRQ1 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 SN74HCS126QPWRQ1?
For technical support, including SN74HCS126QPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCS126QPWRQ1 requirements.
6.How does Aetrix verify that SN74HCS126QPWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74HCS126QPWRQ1 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 SN74HCS126QPWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74HCS126QPWRQ1?
All SN74HCS126QPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCS126QPWRQ1, 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 SN74HCS126QPWRQ1 part is unused and in its original packaging.
Return procedure for SN74HCS126QPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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