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Texas Instruments SN74LVC540AQPWRQ1
- Part No.:
- SN74LVC540AQPWRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC540AQPWRQ1.pdf
- Description:
- IC BUFFER INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,270
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Product details
Overview
SN74LVC540AQPWRQ1 from Texas Instruments is an automotive-qualified octal buffer/driver with 3-state outputs, designed for 2.0 V to 3.6 V VCC operation, supporting mixed-mode 5-V input/3.3-V output translation, and featuring dual active-low output-enable (OE1/OE2) control with max 5.3 ns propagation delay at 3.3 V - used in automotive body control modules for bus line driving and memory address buffering.
For engineers reviewing the SN74LVC540AQPWRQ1 datasheet, SN74LVC540AQPWRQ1 pinout, SN74LVC540AQPWRQ1 application, or SN74LVC540AQPWRQ1 equivalent, key selection criteria include its AEC-Q100 qualification, Ioff partial-power-down support, 5.5-V-tolerant inputs, 24-mA drive strength, and TSSOP-20 package compatibility with high-density automotive PCB layouts.
Technical Context
This device implements eight noninverting buffer channels with independent 3-state control via a dual-input AND gate (OE1 and OE2, both active-low), ensuring all outputs enter high-impedance state if either enable is high. Its logic architecture supports simultaneous enable/disable of all eight outputs without internal contention.
It integrates Ioff circuitry to disable outputs during power-down, preventing backflow current when VCC = 0 V, and accepts input voltages up to 5.5 V regardless of VCC level - enabling direct interfacing between legacy 5-V logic and modern 3.3-V domains in automotive infotainment and gateway systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.0 V to 3.6 V - ensures stable operation across automotive battery voltage transients including cold-crank (down to ~2.0 V). |
| Input Voltage Tolerance | Up to 5.5 V - allows direct connection to 5-V microcontrollers or sensors without level-shifting components. |
| Max Propagation Delay | 5.3 ns at VCC = 3.3 V - enables reliable timing in high-speed address/data bus applications up to ~100 MHz. |
| Output Drive Strength | ±24 mA per channel - sufficient to drive 50-Ω transmission lines or multiple CMOS loads in distributed automotive networks. |
| Ioff Support | Yes - prevents damaging current flow during partial power-down, critical for domain controller sleep/wake transitions. |
| AEC-Q100 Grade | Grade 1 (–40°C to +125°C) - qualified for under-hood and cabin electronics requiring automotive reliability. |
| ESD Rating | >2000 V HBM, >200 V MM - exceeds automotive ESD immunity requirements for assembly and field operation. |
Pinout & Package
TSSOP-20 package (PW), 6.5 mm × 4.4 mm, 1.2 mm max height, lead pitch 0.65 mm, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low output-enable inputs - both must be low for outputs Y1–Y8 to be active; either high forces all outputs into high-Z. |
| 2–9 | A1–A8 | Noninverting data inputs - accept 5.5-V-tolerant signals; directly connect to upstream logic or sensor interfaces. |
| 11–18 | Y1–Y8 | 3-state buffered outputs - drive downstream buses or registers; high-Z state isolates load during power sequencing. |
| 10 | GND | Ground reference - dedicated low-inductance return path for all signal and supply currents. |
| 20 | VCC | Supply rail - powers internal logic and output drivers; decoupling required within 10 mm of pin per automotive layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5-V input tolerance with 3.3-V VCC enables seamless interface between legacy 5-V ECUs and new 3.3-V domain controllers without external translators. |
| Ioff partial-power-down protection | Disables outputs when VCC = 0 V, eliminating backfeed risk during sleep mode - essential for ISO 16750-2 compliant power management. |
| Low ground bounce (VOLP) | Typical <0.8 V at VCC = 3.3 V - reduces noise coupling into adjacent analog or RF circuits in integrated vehicle modules. |
| Controlled undershoot (VOHV) | Typical >2 V at VCC = 3.3 V - maintains valid high-level signaling margin during fast edge transitions on long traces. |
| Automotive qualification | AEC-Q100 Grade 1 certified - validated for continuous operation at 125°C ambient, meeting TS 16949 production requirements. |
Applications
| Body Control Module (BCM) | Instrument Cluster Interface |
|---|---|
|
Use Scenario: Driving multiplexed LIN or CAN subsystem address/data lines from a 3.3-V MCU while interfacing with 5-V sensor hubs. IC Role / Device Role / Timing Role: Noninverting octal buffer with 3-state control acts as bidirectional bus isolator and voltage translator during domain wake-up sequences. Use Value: Eliminates need for discrete level shifters; Ioff prevents backfeed during MCU deep-sleep, reducing quiescent current by >15 µA per channel. |
Use Scenario: Buffering SPI or parallel display interface signals between a 3.3-V graphics processor and 5-V TFT LCD timing controller. IC Role / Device Role / Timing Role: High-speed octal driver provides clean, slew-controlled outputs with sub-6 ns tpd to meet display pixel clock setup/hold timing. Use Value: VOLP <0.8 V and VOHV >2 V ensure signal integrity across 10-cm flex cables, avoiding display flicker or ghosting in wide-temperature operation. |
| Powertrain Gateway | ADAS Camera Interface |
|
Use Scenario: Isolating diagnostic communication lines (K-line/UART) between engine control unit (5-V) and central gateway (3.3-V) during firmware updates. IC Role / Device Role / Timing Role: 3-state buffer enables hot-plug-safe line sharing; OE1/OE2 allow synchronized enable/disable across all eight channels. Use Value: Dual OE inputs simplify MCU GPIO usage; 24-mA drive sustains signal integrity over 2-m harness runs without repeaters. |
Use Scenario: Conditioning parallel camera sensor data lanes (e.g., 8-bit raw image stream) before feeding into 3.3-V image signal processor. IC Role / Device Role / Timing Role: Low-skew octal buffer preserves inter-lane timing alignment; TSSOP-20 footprint minimizes trace length mismatch in high-speed parallel interfaces. Use Value: 5.3 ns max tpd and matched channel delays <0.3 ns ensure pixel data coherency across all eight lanes at 25 MHz pixel clock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer/driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC541AQPWRQ1 | Inverting output polarity vs. noninverting in SN74LVC540AQPWRQ1; otherwise identical VCC range, drive strength, and AEC-Q100 rating. | Requires logic inversion in upstream firmware or external inverters if system expects noninverting data path. | Select only when inverting function aligns with existing signal flow; no PCB change needed but firmware validation required. |
| SN74LVCH16244AQPAGQ1 | 16-channel, 3.3-V-only I/O (no 5.5-V tolerance); higher pin count (48-pin TSSOP); supports bus-hold on inputs. | Suitable for wider data buses but lacks mixed-voltage capability - cannot replace SN74LVC540AQPWRQ1 in 5-V/3.3-V interface roles. | Choose for high-channel-count 3.3-V-only systems; not a drop-in replacement due to incompatible pinout, voltage tolerance, and package size. |
Compared with SN74LVC540AQPWRQ1, SN74LVC541AQPWRQ1 offers functional equivalence with inverted outputs - useful where polarity inversion is acceptable or desired - while SN74LVCH16244AQPAGQ1 scales channel count but sacrifices 5-V input compatibility and requires board redesign.
Availability
SN74LVC540AQPWRQ1 is available at Aetrix Electronics and suitable for automotive body control modules, instrument cluster interfaces, and powertrain gateway designs requiring stable component supply, AEC-Q100 compliance, and mixed-voltage bus translation.
Supply support for SN74LVC540AQPWRQ1 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 ICs, with decades of experience in high-reliability automotive electronics design and manufacturing.
The SN74LVC540A-Q1 product line delivers automotive-qualified logic buffers optimized for voltage translation, bus isolation, and power-aware operation in harsh-temperature vehicle domains.
FAQ
What is the operating temperature range for SN74LVC540AQPWRQ1?
The SN74LVC540AQPWRQ1 is rated for –40°C to +125°C ambient operation, meeting AEC-Q100 Grade 1 requirements. This range covers under-hood environments and passenger cabin electronics where thermal cycling and sustained high temperatures occur. The device's electrical characteristics - including propagation delay, drive strength, and Ioff behavior - are fully specified across this full range, ensuring consistent performance in automotive applications without derating.
Does SN74LVC540AQPWRQ1 support 5-V input signals while powered from 3.3 V?
Yes, SN74LVC540AQPWRQ1 supports input voltages up to 5.5 V regardless of VCC level (2.0 V to 3.6 V). This mixed-mode capability allows direct connection to 5-V microcontrollers, sensors, or legacy peripherals without external level shifters. The input structure is designed to safely clamp and translate these higher voltages internally, maintaining correct logic thresholds and preventing damage - a key feature confirmed in TI's SCAS712B datasheet Section 6.3.
How does the dual output-enable (OE1/OE2) logic work on SN74LVC540AQPWRQ1?
SN74LVC540AQPWRQ1 uses a 2-input AND gate with active-low enables: both OE1 and OE2 must be low for outputs Y1–Y8 to be active (driving A1–A8). If either OE1 or OE2 is high, all outputs immediately enter high-impedance state. This architecture allows flexible control - e.g., OE1 tied to system reset and OE2 to MCU GPIO - enabling coordinated bus isolation during fault recovery or power sequencing without requiring additional logic gates.
Is SN74LVC540AQPWRQ1 compatible with standard TSSOP-20 PCB footprints?
Yes, SN74LVC540AQPWRQ1 uses the JEDEC MO-153 registered TSSOP-20 (PW) package with 0.65 mm pitch, 6.5 mm × 4.4 mm body, and 1.2 mm max height. Its land pattern matches IPC-7351 "SOIC-TSSOP" generic footprint guidelines, and TI provides verified board layout files confirming solder mask defined pads, 0.05 mm min solder mask sliver, and recommended stencil apertures. No custom footprint modification is needed for standard automotive PCB fabrication.
What is the purpose of Ioff in SN74LVC540AQPWRQ1, and how does it benefit automotive systems?
Ioff in SN74LVC540AQPWRQ1 disables all outputs when VCC = 0 V, blocking reverse current flow from powered downstream circuits into the unpowered IC. In automotive domain controllers, this prevents battery drain during sleep mode and avoids latch-up or damage during partial power-down sequences - a requirement for ISO 16750-2 compliance. TI specifies Ioff leakage ≤ ±15 µA at 125°C, ensuring robustness across full automotive temperature range.
SN74LVC540AQPWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74LVC540AQPWRQ1 FAQ
1.How can I place an order for SN74LVC540AQPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC540AQPWRQ1 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 SN74LVC540AQPWRQ1 reliable?
The price and inventory of SN74LVC540AQPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC540AQPWRQ1 is usually 5 days.
3.What payment methods are accepted for SN74LVC540AQPWRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC540AQPWRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC540AQPWRQ1?
SN74LVC540AQPWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC540AQPWRQ1 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 SN74LVC540AQPWRQ1?
For technical support, including SN74LVC540AQPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC540AQPWRQ1 requirements.
6.How does Aetrix verify that SN74LVC540AQPWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74LVC540AQPWRQ1 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 SN74LVC540AQPWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74LVC540AQPWRQ1?
All SN74LVC540AQPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC540AQPWRQ1, 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 SN74LVC540AQPWRQ1 part is unused and in its original packaging.
Return procedure for SN74LVC540AQPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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