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Texas Instruments SN74LVT125QPWRG4Q1
- Part No.:
- SN74LVT125QPWRG4Q1
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVT125QPWRG4Q1.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,100
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Product details
Overview
SN74LVT125QPWRG4Q1 from Texas Instruments is a quad 3-state bus buffer IC designed for automotive-grade 3.3-V logic interfacing with 5-V TTL systems. It features four independent noninverting buffers, each with dedicated output-enable (OE) control, bus-hold inputs eliminating external pullups, Ioff partial-power-down support, and operation down to 2.7 V supply voltage - used in engine control units and ADAS domain controllers.
For engineers reviewing the SN74LVT125QPWRG4Q1 datasheet, SN74LVT125QPWRG4Q1 pinout, SN74LVT125QPWRG4Q1 application, or SN74LVT125QPWRG4Q1 equivalent, key selection criteria include its 14-pin TSSOP package, −40°C to 125°C automotive temperature range, 32-mA drive strength, bus-hold input retention, and mixed-voltage (3.3-V VCC / 5-V tolerant inputs) compatibility.
Technical Context
This device implements four independent noninverting buffer channels, each with active-low 3-state output control via dedicated OE pins. Its bus-hold circuitry maintains valid logic states on undriven inputs without external resistors, and Ioff protection prevents backflow current during partial power-down.
The SN74LVT125QPWRG4Q1 supports mixed-mode signaling: inputs tolerate up to 5.5 V regardless of VCC (2.7–3.6 V), enabling direct interface between 3.3-V logic domains and legacy 5-V TTL buses while maintaining low ground bounce (VOLP < 0.8 V at 3.3 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - enables stable operation under automotive battery droop conditions |
| IOH/IOL | −32 mA / +32 mA - drives standard TTL loads without external buffering |
| VIH/VIL | 2.0 V / 0.8 V - compatible with both 3.3-V CMOS and 5-V TTL input thresholds |
| tPLH/tPHL | 2.7 ns to 4.2 ns (typ @ 3.3 V) - supports >200-MHz bus timing in short trace layouts |
| Operating Temp | −40°C to +125°C - qualified per AEC-Q100 for under-hood automotive applications |
| Bus-Hold | Integrated on all data inputs - eliminates need for 10-kΩ external pullup/pulldown resistors |
| Ioff Current | ±450 µA max - blocks damaging current flow when VCC = 0 and I/O pins are biased |
Pinout & Package
TSSOP-14 (PW) package, 5.0 mm × 4.4 mm body, 0.65-mm lead pitch, 1.2-mm max height, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | OE (Output Enable) | Active-low control per channel - high = high-Z output, low = enabled buffer |
| 2, 5, 11, 14 | A (Input) | Data input per channel - accepts 0–5.5 V, includes bus-hold circuitry |
| 3, 6, 12, 9 | Y (Output) | Noninverting buffered output - 32-mA sink/source, 3.3-V referenced |
| 7 | GND | Ground reference - must be low-impedance connection for noise immunity |
| 8 | VCC | 3.3-V supply - decoupling capacitor required within 1 cm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-voltage interface | 5-V tolerant inputs with 3.3-V VCC - enables seamless bridging between legacy and modern logic domains |
| Bus-hold inputs | Self-biasing on all A inputs - removes risk of floating nodes and EMI susceptibility in unconnected traces |
| Ioff protection | Blocks reverse current during power sequencing - essential for hot-swap and multi-rail system designs |
| Automotive qualification | AEC-Q100 Grade 1 - validated for engine bay and chassis-mounted ECUs requiring long-term reliability |
| Low ground bounce | VOLP < 0.8 V @ 3.3 V - reduces signal integrity degradation in high-speed parallel bus switching |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Interfacing 3.3-V microcontroller GPIOs to legacy 5-V sensor signal conditioning circuits in real-time engine timing control. IC Role / Device Role / Timing Role: Quad noninverting level-shifting buffer with per-channel enable - isolates MCU from 5-V transients while preserving signal polarity and timing margins. Use Value: Eliminates discrete level translators and pullup networks, reducing BOM count and PCB area by >30% in compact ECU modules. | Use Scenario: Driving multiple 5-V camera interface lines from a 3.3-V SoC in surround-view processing units operating at ambient −40°C to 105°C. IC Role / Device Role / Timing Role: High-drive-strength bus buffer with bus-hold - ensures robust signal integrity across long flex cables and noisy vehicle environments. Use Value: Maintains valid logic states during cable disconnect events and suppresses false triggers caused by floating inputs in modular camera harnesses. |
| Body Control Module (BCM) | Infotainment Head Unit |
Use Scenario: Isolating 3.3-V CAN transceiver logic-level signals from 5-V display backlight drivers in centralized vehicle body electronics. IC Role / Device Role / Timing Role: 3-state-enabled buffer with Ioff - allows safe power sequencing where CAN subsystem remains active while display power cycles. Use Value: Prevents backfeed into powered-down domains, meeting ISO 16750-2 load dump and sleep mode leakage requirements. | Use Scenario: Expanding GPIO count from a 3.3-V application processor to drive multiple 5-V audio codec control lines and LED status indicators. IC Role / Device Role / Timing Role: Low-propagation-delay buffer with integrated bus-hold - simplifies firmware initialization by removing boot-time pin state dependencies. Use Value: Reduces startup latency and eliminates need for software-configured pull resistors, improving boot reliability in consumer-facing infotainment systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125AQPWRQ1 | Lower drive (24 mA), no bus-hold, 1.65–3.6 V VCC range | Lacks 5-V input tolerance and bus-hold - requires external pullups and level shifters for 5-V interfaces | Select when cost sensitivity outweighs mixed-voltage needs and board space permits added passives |
| SN74LVTH125QPWRQ1 | Higher drive (64 mA), same bus-hold/Ioff, identical pinout and 5-V tolerance | Same footprint and function but higher current capability - suitable for driving heavier capacitive loads or longer traces | Choose when signal integrity degrades beyond 15 pF load or trace length exceeds 10 cm |
Compared with SN74LVT125QPWRG4Q1, SN74LVC125AQPWRQ1 lacks critical 5-V input tolerance and bus-hold, increasing design complexity; SN74LVTH125QPWRQ1 offers identical functionality with doubled drive strength, making it a drop-in upgrade for marginal timing or loading scenarios.
Availability
SN74LVT125QPWRG4Q1 is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, and body control modules requiring stable component supply across automotive production lifecycles.
Supply support for SN74LVT125QPWRG4Q1 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The SN74LVT125QPWRG4Q1 belongs to TI's LVT (Low-Voltage BiCMOS Technology) logic family, engineered specifically for automotive-grade mixed-voltage bus interfacing with robust ESD, thermal, and power sequencing resilience.
FAQ
What is the maximum input voltage rating for SN74LVT125QPWRG4Q1?
The SN74LVT125QPWRG4Q1 supports input voltages up to 5.5 V across the full operating temperature range, independent of VCC. This 5-V tolerance allows direct connection to legacy TTL outputs without external level-shifting components, and is explicitly specified in the Absolute Maximum Ratings table under VI.
Does SN74LVT125QPWRG4Q1 require external pullup resistors on its inputs?
No, SN74LVT125QPWRG4Q1 does not require external pullup resistors because it integrates bus-hold circuitry on all data inputs (A1–A4). This feature actively maintains the last-valid logic state on undriven or floating inputs, eliminating susceptibility to noise and undefined behavior - confirmed in the Features and Description sections of the datasheet.
What is the recommended power-up sequence for SN74LVT125QPWRG4Q1 to ensure high-impedance outputs?
To guarantee high-impedance outputs during power-up, OE pins of SN74LVT125QPWRG4Q1 must be held high until VCC stabilizes. TI recommends tying each OE to VCC through a pullup resistor; minimum value depends on driver sink capability but is typically ≥10 kΩ. This prevents unintended output activation during rail ramp-up.
Is SN74LVT125QPWRG4Q1 compatible with 2.7-V battery operation in automotive start-stop systems?
Yes, SN74LVT125QPWRG4Q1 is fully specified down to 2.7 V VCC, supporting operation during cold-crank and start-stop battery droop events. Its electrical characteristics - including VOL, VOH, and propagation delay - are guaranteed across 2.7–3.6 V per the Recommended Operating Conditions table, making it suitable for direct connection to unregulated automotive battery rails.
How does the Ioff specification of SN74LVT125QPWRG4Q1 protect system-level power sequencing?
The Ioff specification of SN74LVT125QPWRG4Q1 limits current to ±450 µA when VCC = 0 and any I/O pin is biased between 0–4.5 V. This prevents damaging backflow current during partial power-down - for example, when a downstream 5-V peripheral remains active while the 3.3-V logic domain powers off - satisfying AEC-Q100 stress test requirements for automotive power architecture.
SN74LVT125QPWRG4Q1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVT
- 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:
- 32mA, 32mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
SN74LVT125QPWRG4Q1 FAQ
1.How can I place an order for SN74LVT125QPWRG4Q1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVT125QPWRG4Q1 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 SN74LVT125QPWRG4Q1 reliable?
The price and inventory of SN74LVT125QPWRG4Q1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVT125QPWRG4Q1 is usually 5 days.
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Once your SN74LVT125QPWRG4Q1 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 SN74LVT125QPWRG4Q1?
For technical support, including SN74LVT125QPWRG4Q1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVT125QPWRG4Q1 requirements.
6.How does Aetrix verify that SN74LVT125QPWRG4Q1 is sourced from the original manufacturer or authorized distributors?
All SN74LVT125QPWRG4Q1 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 SN74LVT125QPWRG4Q1 meets industry standards.
7.What is the process for return or replacement of SN74LVT125QPWRG4Q1?
All SN74LVT125QPWRG4Q1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVT125QPWRG4Q1, 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 SN74LVT125QPWRG4Q1 part is unused and in its original packaging.
Return procedure for SN74LVT125QPWRG4Q1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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