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Texas Instruments SN74HCS125QDYYRQ1
- Part No.:
- SN74HCS125QDYYRQ1
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-14 Thin, SOT-23 Variant
- Datasheet:
-
SN74HCS125QDYYRQ1.pdf
- Description:
- IC BUFFER NON-INVERT 6V 14SOT-23
- Quantity:
- Payment:
- Shipping:
Inventory:5,935
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Product details
Overview
SN74HCS125QDYYRQ1 from Texas Instruments is an automotive-grade quadruple buffer IC with 3-state outputs and Schmitt-trigger inputs, performing Y = A logic per channel. It operates from 2V to 6V supply, delivers ±7.8mA output drive at 6V, and supports –40°C to +125°C ambient temperature-enabling robust signal conditioning in engine control units and body electronics.
For engineers reviewing the SN74HCS125QDYYRQ1 datasheet, SN74HCS125QDYYRQ1 pinout, SN74HCS125QDYYRQ1 application, or SN74HCS125QDYYRQ1 equivalent, key selection criteria include Schmitt-trigger noise immunity, 3-state bus interface capability, low ICC (100nA typical), input hysteresis (ΔVT ≥ 0.55V at 2V), and SOT-23-THIN (14-pin) packaging for space-constrained automotive PCBs.
Technical Context
This device integrates four independent CMOS buffers, each with active-low 3-state enable (OE) and Schmitt-trigger input architecture providing hysteresis (ΔVT = 0.55–1.49V). The balanced push-pull outputs support bidirectional current sourcing/sinking up to ±7.8mA at 6V while maintaining rail-to-rail VOH/VOL performance.
It functions as a level-shifting, noise-immune digital gate driver in automotive serial buses and sensor interfaces-where slow-switching signals (e.g., from mechanical switches or analog comparators) require clean edge regeneration before entering high-speed logic domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 6V - enables direct interfacing with 3.3V and 5V automotive subsystems without level shifters |
| Output Drive Strength | ±7.8mA at 6V - sufficient to drive multiple CMOS loads or small LEDs without external buffers |
| Input Hysteresis (ΔVT) | 0.55V min at 2V VCC - rejects noise spikes ≤550mV peak-to-peak on input lines |
| Typical ICC | 100nA at 6V - supports ultra-low-power always-on monitoring circuits in battery-sensitive modules |
| Propagation Delay (tpd) | 5ns max at 6V - ensures timing compliance in sub-100MHz digital control loops |
| Ambient Temperature Range | –40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood and powertrain applications |
| ESD Rating (HBM) | ±4000V - meets automotive ESD immunity requirements for assembly and field operation |
Pinout & Package
SOT-23-THIN (14-pin) package measuring 2.00mm × 4.20mm - optimized for compact automotive PCB layouts with thermal pad (not present in DYY variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 2A, 3A, 4A | Input | Four independent data inputs; each accepts slow/noisy signals due to Schmitt-trigger threshold hysteresis |
| 1OE, 2OE, 3OE, 4OE | Input (Active Low) | Per-channel 3-state enable; logic HIGH forces corresponding output into high-impedance state |
| 1Y, 2Y, 3Y, 4Y | Output | Buffered outputs with rail-to-rail swing; capable of sourcing/sinking ±7.8mA at 6V |
| VCC | Power Supply | Positive supply pin; requires local 0.1µF bypass capacitor for stable operation across temperature |
| GND | Ground Reference | Return path for all I/O and supply currents; must be low-impedance to maintain VOL/VOH specs |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger inputs | Enables reliable operation with slow-edge signals (e.g., mechanical switch bounce or thermistor-based comparators) without external RC filtering |
| 3-state outputs | Allows time-multiplexed sharing of common data buses in multi-node automotive networks (e.g., LIN or proprietary diagnostics lines) |
| Ultra-low ICC (100nA typ) | Reduces quiescent current in always-on vehicle modules such as door latch controllers or occupancy sensors |
| AEC-Q100 Grade 1 qualification | Validated for continuous operation at +125°C ambient - suitable for placement near ECUs, inverters, or HVAC actuators |
| ±7.8mA output drive | Drives standard CMOS inputs (≤10pF) and indicator LEDs directly, eliminating need for discrete transistor stages |
Applications
| Engine Control Unit Signal Conditioning | Body Control Module Switch Debouncing |
|---|---|
Use Scenario: Cleaning noisy crankshaft position sensor pulses before feeding to microcontroller timer capture inputs. IC Role / Device Role / Timing Role: Quadruple buffer regenerates edges using Schmitt-trigger thresholds to eliminate false zero-crossings caused by EMI. Use Value: Prevents misfire detection errors by ensuring clean, jitter-free timing edges at up to 10kHz input rates. | Use Scenario: Debouncing physical door lock/unlock switches in BCM assemblies. IC Role / Device Role / Timing Role: One buffer channel conditions switch input; remaining channels isolate other BCM peripherals. Use Value: Eliminates software debouncing overhead and reduces MCU GPIO usage while meeting ISO 16750-2 transient immunity. |
| Automotive LED Indicator Driver | Diagnostic Port Level Translation |
Use Scenario: Driving status LEDs for OBD-II connector indicators (e.g., MIL, ABS, airbag warning). IC Role / Device Role / Timing Role: Buffer output drives LED directly via series resistor; 3-state allows dynamic disable during sleep mode. Use Value: Achieves 20mA LED brightness at 5V with <0.3V VOL drop - no external FET required. | Use Scenario: Isolating diagnostic communication lines between 3.3V microcontroller and 5V legacy tool interface. IC Role / Device Role / Timing Role: Acts as unidirectional voltage-tolerant repeater with noise rejection on tool-side RX line. Use Value: Maintains signal integrity across mixed-voltage domains while rejecting conducted noise from vehicle battery transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCS125DRQ1 | SOIC-14 package (9.9mm × 3.9mm); higher RθJA (133.6°C/W) vs. DYY's 236.5°C/W | Better suited for prototyping and manual soldering; less optimal for high-density automotive PCBs | Select when board real estate is not constrained and hand assembly is required |
| SN74HCS125PWQ1 | TSSOP-14 package (5.0mm × 4.4mm); 151.7°C/W thermal resistance; same electrical specs | Offers intermediate footprint size and reflow compatibility for mid-volume production | Choose for automated SMT lines where DYY's fine-pitch leads pose inspection challenges |
Compared with SN74HCS125QDYYRQ1, the SOIC variant offers easier handling but sacrifices board density, while the TSSOP balances manufacturability and space efficiency-neither is pin-compatible due to differing lead pitch and thermal pad presence.
Availability
SN74HCS125QDYYRQ1 is available at Aetrix Electronics and suitable for engine control units, body control modules, and diagnostic interface designs requiring stable component supply across automotive production lifecycles.
Supply support for SN74HCS125QDYYRQ1 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 and embedded processing solutions, with deep expertise in automotive-grade IC design and AEC-Q100 qualification.
The SN74HCS125-Q1 product line delivers robust, low-power buffering for automotive signal integrity applications-including switch debouncing, sensor interface conditioning, and bus isolation-designed specifically for harsh-temperature environments.
FAQ
What is the maximum capacitive load SN74HCS125QDYYRQ1 can drive while meeting datasheet timing specs?
The SN74HCS125QDYYRQ1 is specified to drive loads ≤50pF while maintaining guaranteed propagation delay and transition time performance. Exceeding this capacitance increases tpd and tt beyond published limits (e.g., >24ns tpd at 6V), potentially causing setup/hold violations in synchronous systems. For heavier loads, add a series resistor or use a dedicated line driver.
Does SN74HCS125QDYYRQ1 support true bidirectional data flow?
No, SN74HCS125QDYYRQ1 is a unidirectional buffer (Y = A) with independent 3-state control per channel. It cannot pass data from output to input. For bidirectional bus transceivers, consider SN74HCS245QDRQ1 or similar octal transceivers with direction control.
Can unused inputs on SN74HCS125QDYYRQ1 be left floating?
No, unused inputs on SN74HCS125QDYYRQ1 must be terminated to VCC or GND. Although Schmitt-trigger inputs tolerate slow transitions, floating nodes cause undefined logic states, increased ICC, and potential oscillation due to noise coupling-TI recommends 10kΩ pullup/pulldown resistors per unused A or OE pin.
What is the purpose of the thermal pad in SN74HCS125QDYYRQ1's package?
SN74HCS125QDYYRQ1 does not include a thermal pad-the SOT-23-THIN (DYY) package has no exposed pad. Thermal pads are present only in WQFN (BQA) variants. For DYY, thermal management relies on copper pour under the leads and proper PCB layout per TI's SLLA275 guidelines.
How does SN74HCS125QDYYRQ1 differ from commercial-grade SN74HCS125 in terms of reliability?
SN74HCS125QDYYRQ1 undergoes AEC-Q100 stress testing (including HTOL, TC, UHAST) and is screened for automotive use-guaranteeing operation from –40°C to +125°C, enhanced ESD robustness (±4kV HBM), and extended product lifecycle support. Commercial SN74HCS125 lacks these qualifications and is rated only to +70°C or +85°C.
SN74HCS125QDYYRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-14 Thin, SOT-23 Variant
- 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOT-23-THIN
SN74HCS125QDYYRQ1 FAQ
1.How can I place an order for SN74HCS125QDYYRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCS125QDYYRQ1 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 SN74HCS125QDYYRQ1 reliable?
The price and inventory of SN74HCS125QDYYRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCS125QDYYRQ1 is usually 5 days.
3.What payment methods are accepted for SN74HCS125QDYYRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCS125QDYYRQ1 transactions.
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4.How is shipping managed for SN74HCS125QDYYRQ1?
SN74HCS125QDYYRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCS125QDYYRQ1 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 SN74HCS125QDYYRQ1?
For technical support, including SN74HCS125QDYYRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCS125QDYYRQ1 requirements.
6.How does Aetrix verify that SN74HCS125QDYYRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74HCS125QDYYRQ1 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 SN74HCS125QDYYRQ1 meets industry standards.
7.What is the process for return or replacement of SN74HCS125QDYYRQ1?
All SN74HCS125QDYYRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCS125QDYYRQ1, 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 SN74HCS125QDYYRQ1 part is unused and in its original packaging.
Return procedure for SN74HCS125QDYYRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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