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Texas Instruments SN74LVT125QDRQ1
- Part No.:
- SN74LVT125QDRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LVT125QDRQ1.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,783
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Product details
Overview
SN74LVT125QDRQ1 from Texas Instruments is an automotive-qualified 3.3-V ABT quadruple bus buffer with 3-state outputs, featuring four independent noninverting drivers, bus-hold inputs, Ioff partial-power-down support, and mixed-mode 5-V/3.3-V signal compatibility - used in automotive infotainment backplane buffering and ECU data bus isolation.
For engineers reviewing the SN74LVT125QDRQ1 datasheet, SN74LVT125QDRQ1 pinout, SN74LVT125QDRQ1 application, or SN74LVT125QDRQ1 equivalent, key selection criteria include 3.3-V VCC operation with 5-V tolerant inputs, –40°C to 125°C automotive temperature range, SOIC-14 package, 32-mA output drive, and bus-hold functionality eliminating external pullups.
Technical Context
This device implements four independent noninverting buffer channels, each controlled by a dedicated output-enable (OE) input that places the corresponding Y output in high-impedance state when asserted high. Bus-hold circuitry actively maintains valid logic levels on unused A inputs without external resistors.
Designed for automotive environments, it supports unregulated battery operation down to 2.7 V, includes Ioff protection to prevent backflow during partial power-down, and meets MIL-STD-883 ESD requirements (>2000 V HBM, >200 V MM). All inputs tolerate up to 7 V, enabling direct interfacing with 5-V logic systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply Range | 2.7 V to 3.6 V - enables stable operation across automotive battery voltage fluctuations including cold-crank conditions. |
| Output Drive (IOL/IOH) | ±32 mA - sufficient to drive standard TTL loads and moderate-capacitance PCB traces without external buffers. |
| Propagation Delay (tPLH/tPHL) | 2.7 ns to 4.2 ns at VCC = 3.3 V - ensures timing integrity in high-speed 32-bit data bus applications. |
| Input Voltage Tolerance (VI) | –0.5 V to 7 V - allows direct connection to 5-V microcontrollers or FPGAs without level-shifting circuitry. |
| Operating Temperature | –40°C to +125°C - qualified per AEC-Q100 for under-hood and dashboard-mounted automotive electronics. |
| Bus-Hold Current (II(hold)) | ±75 µA at VCC = 3 V - actively retains last valid logic state on floating inputs, preventing metastability in multiplexed bus systems. |
| Ioff Leakage | ±450 µA at VCC = 0 V - blocks damaging current flow between powered and unpowered subsystems during hot-swap or sleep-mode transitions. |
Pinout & Package
SN74LVT125QDRQ1 is housed in a 14-pin SOIC (D) package, 8.75 mm × 3.91 mm footprint, 1.75 mm max height, RoHS-compliant NIPDAU finish, MSL Level-1, and designed for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Output-enable control inputs | Active-low logic disabled; asserting high forces corresponding Y output into high-impedance state for bus sharing. |
| 1A–4A | Data inputs | Noninverting buffer inputs with integrated bus-hold; retain last logic state when floating - no external pullup required. |
| 1Y–4Y | Buffered outputs | 3-state CMOS outputs capable of ±32 mA drive; compatible with TTL and LVTTL logic families. |
| VCC | Power supply | 3.3-V nominal supply; supports down to 2.7 V for battery brownout resilience in automotive systems. |
| GND | Ground reference | Common return path for all digital signals and internal bias networks; must be low-impedance for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode 5-V/3.3-V interface | Inputs accept 0–7 V, outputs swing rail-to-rail at 3.3 V - eliminates level shifters when connecting legacy 5-V MCUs to modern low-voltage buses. |
| Integrated bus-hold circuitry | Actively holds unused A inputs at last valid logic level - removes need for 10-kΩ pullup/pulldown resistors and saves board space. |
| Ioff partial-power-down protection | Blocks reverse current flow when VCC = 0 V and I/O pins are biased - prevents damage during hot-plug or subsystem power sequencing. |
| Automotive qualification (AEC-Q100) | Qualified for Grade 1 (–40°C to +125°C) operation with enhanced ESD robustness (>2000 V HBM) - suitable for safety-critical vehicle networks. |
| Low ground bounce (VOLP) | Typical <0.8 V at VCC = 3.3 V - reduces switching noise coupling into analog sections and improves signal integrity in mixed-signal ECUs. |
Applications
| Automotive Instrument Cluster Interface | ADAS Sensor Data Multiplexing |
|---|---|
Use Scenario: Isolating and buffering SPI or parallel data lines between MCU and TFT display controller in instrument clusters subject to wide temperature swings and EMI. IC Role / Device Role / Timing Role: Noninverting 3-state bus buffer providing direction-controlled data path isolation and voltage-level translation between 3.3-V SoC and 5-V display driver ICs. Use Value: Bus-hold eliminates floating inputs during display power-up/down sequences; Ioff prevents backfeed when display subsystem powers down independently. |
Use Scenario: Aggregating camera, radar, and ultrasonic sensor outputs onto shared CAN/FlexRay gateway buses in ADAS domain controllers. IC Role / Device Role / Timing Role: Quadruple 3-state buffer enabling time-multiplexed sensor data routing while maintaining signal integrity across varying load capacitances. Use Value: 32-mA drive strength sustains edge rates over 15-cm traces; 2.7–3.6-V VCC range accommodates degraded battery during engine start. |
| Body Control Module (BCM) Diagnostics Port | Infotainment Head Unit Expansion Bus |
Use Scenario: Buffering UART or LIN diagnostic signals between vehicle OBD-II connector and BCM microcontroller during service mode entry. IC Role / Device Role / Timing Role: Bidirectional signal isolator with OE-controlled enable/disable - prevents contention when multiple modules share diagnostic bus. Use Value: 5-V tolerant inputs accept legacy scan tools; automotive temp rating ensures reliability in trunk-mounted BCM locations. |
Use Scenario: Extending internal parallel bus between main SoC and secondary audio DSP or Bluetooth module in head units with modular architecture. IC Role / Device Role / Timing Role: Low-skew quadruple buffer enabling synchronous data transfer across PCB splits or flex cable interconnects. Use Value: Propagation delay <4.2 ns ensures setup/hold compliance at 25-MHz bus clock; SOIC-14 footprint simplifies layout in space-constrained front-panel assemblies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVTH125QDRQ1 | Lower drive (±24 mA), same VCC range and bus-hold, but uses LVTH logic family with slightly higher propagation delay (5.5 ns typical). | Less suitable for driving long traces or heavy capacitive loads; preferred where lower power consumption is prioritized over speed. | Select SN74LVTH125QDRQ1 only if system load capacitance <30 pF and timing margin >1.5 ns is available. |
| MC74VHC125DTG | Non-automotive grade, 2–5.5-V VCC range, no bus-hold, no Ioff, higher max VCC (5.5 V), but same SOIC-14 pinout. | Lacks AEC-Q100 qualification and partial-power-down capability - unsuitable for safety-critical automotive modules. | Use MC74VHC125DTG only in industrial or consumer applications requiring wider supply range and no automotive compliance. |
Compared with SN74LVT125QDRQ1, SN74LVTH125QDRQ1 trades drive strength and speed for reduced ICC, while MC74VHC125DTG offers broader VCC flexibility at the cost of automotive reliability features - making SN74LVT125QDRQ1 the optimal choice for AEC-Q100-compliant 3.3-V bus isolation with robust mixed-voltage interfacing.
Availability
SN74LVT125QDRQ1 is available at Aetrix Electronics and suitable for automotive instrument cluster interfaces, ADAS sensor multiplexing, body control module diagnostics, and infotainment expansion buses requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVT125QDRQ1 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 specializing in analog, embedded processing, and automotive-grade logic solutions, with decades of leadership in high-reliability interface IC design.
The SN74LVT125QDRQ1 belongs to TI's automotive-qualified LVT logic family, engineered specifically for robust 3.3-V bus buffering in electrically noisy, thermally demanding vehicle subsystems - emphasizing mixed-voltage interoperability and fail-safe power sequencing.
FAQ
What is the maximum input voltage rating for SN74LVT125QDRQ1?
The SN74LVT125QDRQ1 supports an input voltage range of –0.5 V to 7 V, allowing direct connection to 5-V logic sources without external level-shifting components. This specification is verified across the full operating temperature range (–40°C to +125°C) and enables seamless integration with legacy microcontrollers and FPGAs in automotive systems.
Does SN74LVT125QDRQ1 require external pullup resistors on its inputs?
No, SN74LVT125QDRQ1 includes integrated bus-hold circuitry on all A inputs, which actively maintains the last valid logic state when inputs are floating. Using external pullup or pulldown resistors with SN74LVT125QDRQ1 is explicitly discouraged in the datasheet, as it may interfere with bus-hold operation and increase power consumption.
Can SN74LVT125QDRQ1 operate reliably during automotive cold-crank conditions?
Yes, SN74LVT125QDRQ1 is specified to operate down to 2.7 V VCC, meeting automotive cold-crank voltage requirements where battery voltage can dip below 3.0 V. Its guaranteed performance across –40°C to +125°C and Ioff protection ensure functional integrity during engine start and thermal cycling in under-hood environments.
What is the purpose of the Ioff feature in SN74LVT125QDRQ1?
The Ioff feature in SN74LVT125QDRQ1 disables output drivers and limits leakage current to ±450 µA when VCC = 0 V, preventing damaging current backflow from live I/O lines into a powered-down subsystem. This enables safe partial-power-down operation in modular automotive ECUs where individual sections power up/down independently.
Is SN74LVT125QDRQ1 pin-compatible with standard SN74LVT125 variants?
Yes, SN74LVT125QDRQ1 shares identical pinout, electrical characteristics, and SOIC-14 package dimensions with the commercial-grade SN74LVT125, including matching terminal assignments for OE, A, Y, VCC, and GND. The Q1 suffix denotes AEC-Q100 qualification but does not alter physical or functional compatibility.
SN74LVT125QDRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVT
- 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:
- 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-SOIC
SN74LVT125QDRQ1 FAQ
1.How can I place an order for SN74LVT125QDRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVT125QDRQ1 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 SN74LVT125QDRQ1 reliable?
The price and inventory of SN74LVT125QDRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVT125QDRQ1 is usually 5 days.
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SN74LVT125QDRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVT125QDRQ1 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 SN74LVT125QDRQ1?
For technical support, including SN74LVT125QDRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVT125QDRQ1 requirements.
6.How does Aetrix verify that SN74LVT125QDRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74LVT125QDRQ1 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 SN74LVT125QDRQ1 meets industry standards.
7.What is the process for return or replacement of SN74LVT125QDRQ1?
All SN74LVT125QDRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVT125QDRQ1, 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 SN74LVT125QDRQ1 part is unused and in its original packaging.
Return procedure for SN74LVT125QDRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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