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Texas Instruments SN74HCS126QDRQ1
- Part No.:
- SN74HCS126QDRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74HCS126QDRQ1.pdf
- Description:
- IC BUFFER NON-INVERT 6V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,508
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Product details
Overview
SN74HCS126QDRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified automotive quadruple buffer with 3-state outputs and Schmitt-trigger inputs, 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 provides hysteresis (ΔVT) up to 1.6 V for noise immunity-used in vehicle body control modules for signal conditioning and switch debouncing.
For engineers reviewing the SN74HCS126QDRQ1 datasheet, SN74HCS126QDRQ1 pinout, SN74HCS126QDRQ1 application, or SN74HCS126QDRQ1 equivalent, key selection criteria include its Schmitt-trigger input thresholds (VT+ = 4.2 V / VT− = 3.0 V at 6 V), 3-state enable timing (ten = 12 ns max at 6 V), automotive temperature range (−40°C to +125°C), and SOIC-14 package compatibility with legacy board layouts.
Technical Context
This device implements four independent positive-logic buffers (Y = A) with active-high 3-state enable (OE) per channel. Each channel integrates balanced CMOS 3-state outputs capable of sourcing/sinking ±7.8 mA at 6 V and Schmitt-trigger inputs with programmable hysteresis (ΔVT = 0.6–1.6 V depending on VCC).
It operates across 2 V–6 V supply while maintaining AEC-Q100 Grade 1 compliance, HBM ESD Level 2 (±4 kV), and CDM Level C4B (±1.5 kV). Input leakage is ±100 nA max at 6 V, and propagation delay is 7 ns typical at 6 V with 50-pF load.
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 without level shifters |
| Output Drive Strength | ±7.8 mA at 6 V - sufficient to directly drive LEDs, small relays, or multiple CMOS inputs (fan-out ≥ 20) |
| Propagation Delay (tpd) | 7 ns typical at 6 V - enables use in sub-100-MHz digital control paths with predictable timing margins |
| Input Hysteresis (ΔVT) | 0.6–1.6 V (VCC-dependent) - rejects noise spikes ≤1.6 V peak-to-peak and accepts slow-rising signals (e.g., mechanical switch bounce) |
| Quiescent Supply Current (ICC) | 100 nA typical at 6 V - enables always-on monitoring circuits with negligible battery drain in sleep modes |
| ESD Rating | HBM ±4 kV, CDM ±1.5 kV - meets AEC-Q100 stress requirements for under-hood and cabin electronics |
| Operating Temperature | −40°C to +125°C (TA) - qualified for engine control units, HVAC actuators, and lighting control modules |
Pinout & Package
SN74HCS126QDRQ1 uses a 14-pin SOIC (D) package measuring 8.70 mm × 3.90 mm with standard 1.27-mm pitch. Pin 1 is 1OE (Channel 1 Output Enable, active high); pins 2/3 are 1A/1Y; pins 4/5/6 are 2OE/2A/2Y; pin 7 is GND; pins 8–13 are 3Y/3A/3OE/4Y/4A/4OE; pin 14 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-high output enable control per channel | Drives corresponding Y output to high-impedance state when low - enables bus sharing and signal multiplexing |
| 1A–4A | Buffer input per channel | Accepts Schmitt-triggered logic signals; tolerates slow edges and noise without false triggering |
| 1Y–4Y | Buffer output per channel | CMOS-compatible push-pull output with 3-state capability; sinks/sources up to ±7.8 mA at 6 V |
| VCC (Pin 14) | Positive supply rail | Must be decoupled with 0.1-μF ceramic capacitor placed adjacent to pin to suppress switching noise |
| GND (Pin 7) | Reference ground | Provides return path for all output currents and internal logic; requires low-impedance PCB plane connection |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C ambient operation - suitable for powertrain, chassis, and body electronics without derating |
| Schmitt-trigger input hysteresis | ΔVT up to 1.6 V at 6 V - eliminates need for external RC debounce networks on switch or sensor inputs |
| Low quiescent current | 100 nA typical ICC - extends battery life in always-on vehicle modules such as door lock controllers and occupancy sensors |
| 3-state output architecture | Independent OE per channel - allows dynamic bus arbitration and prevents contention in multi-driver systems |
| Wide supply voltage range | 2 V–6 V operation - interoperable with 3.3 V MCUs, 5 V legacy peripherals, and 2.5 V sensor interfaces |
Applications
| Body Control Module Signal Routing | Automotive LED Driver Interface |
|---|---|
Use Scenario: Routing ignition status, door latch, or window position signals between MCU and distributed ECUs in a vehicle body control module. IC Role / Device Role / Timing Role: Buffer isolates MCU GPIOs from long harness traces while enabling/disabling signal paths via OE control during sleep/wake transitions. Use Value: Schmitt-trigger inputs reject EMI-induced glitches on 2-m harness runs; 3-state outputs prevent bus contention during MCU reset sequences. | Use Scenario: Driving indicator LEDs for turn signals, hazard lights, or interior status feedback in automotive dashboards. IC Role / Device Role / Timing Role: Acts as current-boosting buffer between low-drive MCU pins and LEDs requiring >5 mA forward current. Use Value: ±7.8-mA output drive at 6 V eliminates need for discrete transistors; wide VCC range accommodates both 3.3 V MCU logic and 5 V LED supply rails. |
| Switch Debounce for Occupancy Sensors | Noise-Immune Sensor Interface |
Use Scenario: Conditioning mechanical switch inputs from seatbelt buckles, door jamb switches, or trunk latches in safety-critical occupancy detection systems. IC Role / Device Role / Timing Role: Converts noisy, slow-rising switch closures into clean CMOS-level signals synchronized to MCU clock domain. Use Value: Input hysteresis (≥1.2 V at 4.5 V) suppresses bounce artifacts lasting <10 ms; low ICC ensures minimal impact on system standby power budget. | Use Scenario: Interfacing analog sensor outputs (e.g., thermistors, potentiometers) digitized via comparator stages in climate control or mirror adjustment modules. IC Role / Device Role / Timing Role: Buffers comparator output before feeding to MCU interrupt pin or ADC trigger input. Use Value: Rejects conducted noise from nearby motors or solenoids; TTL/CMOS-compatible VOH/VOL ensures reliable logic level translation across 2–6 V supply domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCS125QDRQ1 | Inverting buffer (Y = NOT A); identical Schmitt-trigger inputs, 3-state outputs, and AEC-Q100 Grade 1 specs | Requires logic inversion in signal path; unsuitable where polarity must be preserved | Select only if system design accommodates inverted logic; otherwise, SN74HCS126QDRQ1 maintains signal polarity |
| MC74HC126ADTR2G | Non-automotive grade (no AEC-Q100); same pinout and electrical specs but rated only to −55°C to +125°C industrial range | Lacks automotive qualification documentation and stress test history; not approved for safety-critical vehicle functions | Use only in non-safety automotive subsystems (e.g., infotainment accessories) where AEC-Q100 is not mandated |
Compared with SN74HCS126QDRQ1, SN74HCS125QDRQ1 provides functional inversion at identical performance and qualification, while MC74HC126ADTR2G offers cost savings in non-safety applications but lacks automotive traceability and reliability validation.
Availability
SN74HCS126QDRQ1 is available at Aetrix Electronics and suitable for automotive body control modules, LED driver interfaces, switch debounce circuits, and noise-immune sensor signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for SN74HCS126QDRQ1 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 SN74HCS126QDRQ1 belongs to TI's HCS logic family designed specifically for robust, low-power signal conditioning in automotive environments-emphasizing noise immunity, wide voltage operation, and AEC-Q100 compliance.
FAQ
What is the maximum capacitive load SN74HCS126QDRQ1 can drive while meeting datasheet timing specifications?
The SN74HCS126QDRQ1 is characterized for loads ≤50 pF in the datasheet. At 6 V supply, it maintains tpd ≤26 ns and transition time tt ≤8 ns within this limit. Driving larger capacitances increases propagation delay and may cause signal integrity issues; for >50-pF loads, consider adding series termination or reducing trace length to maintain timing margins in the SN74HCS126QDRQ1 application.
Does SN74HCS126QDRQ1 require external pull-up or pull-down resistors on unused inputs?
Yes - unused inputs on SN74HCS126QDRQ1 must be terminated to VCC or GND to prevent floating states that cause excessive current draw and logic instability. A 10-kΩ resistor is recommended for default HIGH or LOW biasing. Leaving inputs unconnected violates AEC-Q100 layout guidelines and risks undefined behavior in automotive temperature extremes.
Can SN74HCS126QDRQ1 outputs be paralleled for higher current drive?
Yes - two or more channels of SN74HCS126QDRQ1 with identical inputs and enables can be wired in parallel to increase sink/source capability beyond ±7.8 mA. Ensure matched trace lengths and simultaneous OE activation. This technique is documented in TI's application notes for SN74HCS126QDRQ1 and validated for driving higher-current indicators or small solenoids.
What is the minimum input voltage required to register a logic HIGH on SN74HCS126QDRQ1 at 5 V supply?
At VCC = 5 V, the minimum input voltage to guarantee a logic HIGH is VT+ = 3.15 V (typical) per the datasheet's Electrical Characteristics table. The guaranteed minimum is VT+(min) = 1.7 V, but design margin requires using the typical or worst-case value depending on noise environment. For robust SN74HCS126QDRQ1 operation in noisy automotive settings, ensure input signals exceed 3.2 V for HIGH recognition.
Is SN74HCS126QDRQ1 compatible with 1.8 V logic systems?
No - SN74HCS126QDRQ1 has a minimum supply voltage of 2 V and is not specified for 1.8 V operation. Its Schmitt-trigger thresholds scale with VCC; at 1.8 V, VT+ would fall below valid logic HIGH levels for 1.8-V systems, risking incorrect interpretation. Use TI's SN74LVC1G17 or similar 1.65–5.5 V buffered inverters for true 1.8-V compatibility instead of SN74HCS126QDRQ1.
SN74HCS126QDRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCS
- 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:
- 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-SOIC
SN74HCS126QDRQ1 FAQ
1.How can I place an order for SN74HCS126QDRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCS126QDRQ1 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 SN74HCS126QDRQ1 reliable?
The price and inventory of SN74HCS126QDRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCS126QDRQ1 is usually 5 days.
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SN74HCS126QDRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCS126QDRQ1 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 SN74HCS126QDRQ1?
For technical support, including SN74HCS126QDRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCS126QDRQ1 requirements.
6.How does Aetrix verify that SN74HCS126QDRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74HCS126QDRQ1 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 SN74HCS126QDRQ1 meets industry standards.
7.What is the process for return or replacement of SN74HCS126QDRQ1?
All SN74HCS126QDRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCS126QDRQ1, 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 SN74HCS126QDRQ1 part is unused and in its original packaging.
Return procedure for SN74HCS126QDRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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