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Texas Instruments SN74LV540APW
- Part No.:
- SN74LV540APW
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LV540APW.pdf
- Description:
- IC BUFFER INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,597
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Product details
Overview
SN74LV540APW from Texas Instruments is an octal inverting buffer/driver with 3-state outputs, designed for bus line driving and memory address register buffering in 2 V to 5.5 V systems. It features dual active-low output enables (OE1/OE2), supports mixed-mode voltage operation, provides <0.8 V output ground bounce at 3.3 V, and delivers 8.5 ns max propagation delay at 5 V - enabling reliable signal isolation in industrial instrumentation and automotive infotainment buses.
For engineers reviewing the SN74LV540APW datasheet, SN74LV540APW pinout, SN74LV540APW application, or SN74LV540APW equivalent, this page delivers verified electrical characteristics, TSSOP-20 package layout guidance, Ioff partial-power-down support, and real-world switching behavior across –40°C to 125°C operation - critical for high-reliability embedded bus interface design.
Technical Context
The SN74LV540APW implements eight independent inverting buffers, each with a two-input AND gate control structure for 3-state enable: OE1 and OE2 are active-low, and either high forces all Y outputs into high-impedance. Inputs tolerate up to 5.5 V regardless of VCC, enabling down-translation from 5 V logic to 3.3 V or 2.5 V domains.
Its low-drive CMOS architecture minimizes output ringing via controlled edge rates (20 ns/V min at 5 V), while Ioff protection ensures no current flow when VCC = 0 V - essential for hot-swap and power sequencing in multi-rail systems. Latch-up immunity exceeds 250 mA per JESD17.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports single-supply operation across legacy 5 V, standard 3.3 V, and low-voltage 2.5 V/2 V systems. |
| tpd (max) | 8.5 ns at VCC = 5 V, CL = 15 pF - ensures timing-critical bus buffering with margin for 25 MHz+ clock domains. |
| IOH/IOL | –16 mA / +16 mA at VCC = 4.5 V - sufficient drive for TTL-compatible loads without external pull-ups. |
| VOLP / VOHV | <0.8 V / >2.3 V at VCC = 3.3 V - quantified noise margins that suppress false triggering in noisy industrial environments. |
| Ioff | <5 µA at VCC = 0 V - prevents back-powering and leakage during partial power-down or system sleep states. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive, factory-floor PLCs, and medical patient monitoring equipment. |
| ESD Rating | ±2000 V HBM - meets industrial-grade ESD robustness requirements without external protection circuitry. |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 0.65 mm pitch, 1.2 mm max height, gull-wing leads, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low 3-state enables - either high disables all eight outputs; tie to VCC via pull-up for power-up high-Z safety. |
| 2–9 | A1–A8 | Inverting input terminals - accept 0–5.5 V signals independent of VCC, enabling mixed-voltage interfacing. |
| 11–18 | Y8–Y1 | Inverting buffered outputs - drive bus lines with controlled slew rate; high-Z state isolates downstream loads. |
| 10 | GND | Ground reference - must be low-impedance; decoupling capacitor required adjacent to Pin 20. |
| 20 | VCC | Power supply - bypass with 0.1 µF ceramic capacitor placed within 3 mm of pin to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage operation | Inputs tolerate 0–5.5 V at any VCC (2–5.5 V), enabling seamless level translation between 5 V microcontrollers and 3.3 V peripherals. |
| Ioff partial-power-down support | Blocks current flow on inputs/outputs when VCC = 0 V - prevents backfeeding and allows safe insertion into live backplanes. |
| Low-noise output drive | Typical VOLP <0.8 V and VOHV >2.3 V at 3.3 V ensure >1.5 V noise margin against ground bounce and undershoot-induced glitches. |
| Slow-edge optimization | Δt/Δv ≥20 ns/V at 5 V reduces EMI and eliminates ringing on unterminated PCB traces up to 10 cm. |
| Latch-up immunity | Exceeds 250 mA per JESD17 - withstands transient overcurrent events in motor-control feedback loops or relay driver interfaces. |
Applications
| Industrial Instrumentation | Automotive Infotainment |
|---|---|
Use Scenario: Isolating sensor data acquisition bus from MCU during firmware updates. IC Role / Device Role / Timing Role: Octal inverting buffer with dual OE control acts as bidirectional bus gate, enforcing high-Z during reprogramming. Use Value: Prevents bus contention and data corruption by ensuring zero output drive during flash write cycles - validated across –40°C to 125°C. |
Use Scenario: Driving display interface lines between head-unit SoC and LCD timing controller. IC Role / Device Role / Timing Role: Voltage-translating buffer translates 5 V GPU control signals to 3.3 V display IC inputs while suppressing EMI. Use Value: Eliminates need for discrete level shifters and RC filters; VOLP <0.8 V guarantees clean pixel clock edges at 25 MHz. |
| Patient Monitoring Systems | Network Switch Backplane |
Use Scenario: Buffering ECG analog front-end address lines to multiplexer select inputs. IC Role / Device Role / Timing Role: Low-noise inverting driver isolates sensitive analog section from digital switching noise on shared PCB layer. Use Value: VOLP <0.8 V and VOHV >2.3 V prevent false triggers in 24-bit ADC sampling - critical for FDA Class II compliance. |
Use Scenario: Driving 10/100 Ethernet PHY address configuration pins from management MCU. IC Role / Device Role / Timing Role: 3-state octal buffer enables dynamic reconfiguration of PHY registers without bus contention. Use Value: Dual OE inputs allow synchronized enable/disable of all eight lines - reducing setup/hold timing violations during hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC540APW | Lower VCC range (1.65–3.6 V); faster tpd (5.4 ns @ 3.3 V); no 5 V tolerance on inputs. | Restricted to 3.3 V-only systems; unsuitable for mixed 5 V/3.3 V interfacing. | Select only if full 5 V input tolerance is unnecessary and speed is prioritized over voltage flexibility. |
| 74LVX540M | Same 2–3.6 V VCC range; higher drive (±24 mA); no Ioff specification; obsolete status. | Lacks partial-power-down support; not recommended for new designs requiring hot-swap capability. | Use only for legacy repair; SN74LV540APW offers superior reliability, thermal specs, and lifecycle support. |
Compared with SN74LVC540APW and 74LVX540M, the SN74LV540APW uniquely combines 5.5 V input tolerance, Ioff-enabled power sequencing, and –40°C to 125°C qualification - making it the only choice for robust, mixed-voltage industrial and automotive bus isolation.
Availability
SN74LV540APW is available at Aetrix Electronics and suitable for industrial instrumentation, automotive infotainment, and patient monitoring systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LV540APW 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 connectivity technologies, with decades of expertise in high-reliability logic and interface solutions.
The SN74LV540APW belongs to TI's LV family of low-voltage, high-noise-immunity logic devices - engineered specifically for robust bus interfacing in harsh industrial, automotive, and medical environments.
FAQ
What is the maximum operating temperature for the SN74LV540APW?
The SN74LV540APW is rated for continuous operation from –40°C to +125°C ambient temperature, as confirmed in Section 6.3 Recommended Operating Conditions of the official TI datasheet SCLS409J. This rating applies to the TSSOP-20 (PW) package variant and is validated across all electrical parameters including propagation delay, output drive, and Ioff leakage.
Does the SN74LV540APW support 5 V input signals when powered at 3.3 V?
Yes, the SN74LV540APW supports input voltages up to 5.5 V regardless of VCC level - a feature explicitly documented in Section 8.3 Feature Description and Table 6.3. When VCC = 3.3 V, inputs A1–A8 safely accept 5 V logic levels, enabling down-translation without external level shifters.
How does the dual output-enable architecture of the SN74LV540APW function?
The SN74LV540APW uses two active-low enables (OE1 and OE2) wired as an AND gate: both must be low for outputs Y1–Y8 to drive inverted data; if either OE1 or OE2 is high, all outputs enter high-impedance. This is defined in Section 8.4 Device Functional Modes and Figure 8-1, allowing flexible bus arbitration in multi-master systems.
What is the purpose of the Ioff specification for the SN74LV540APW?
The Ioff specification (≤5 µA at VCC = 0 V) ensures the SN74LV540APW blocks current flow on all I/O pins during power-down or partial-power-down states. As stated in Section 8.3, this prevents back-driving of powered sections and enables safe hot-insertion - critical for modular industrial controllers and automotive domain ECUs.
Is the SN74LV540APW pin-compatible with other packages in the SN74LV540A family?
No - the SN74LV540APW (TSSOP-20) shares identical logic functionality and pin numbering with SN74LV540ADBR (SSOP), SN74LV540ADGVR (TVSOP), and SN74LV540ARGYR (VQFN), but mechanical dimensions, thermal resistance (RθJA = 128.2°C/W), and solder profile differ. PCB layout must be redesigned per package; no drop-in replacement is possible without footprint revision.
SN74LV540APW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 16mA, 16mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74LV540APW FAQ
1.How can I place an order for SN74LV540APW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV540APW 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 SN74LV540APW reliable?
The price and inventory of SN74LV540APW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV540APW is usually 5 days.
3.What payment methods are accepted for SN74LV540APW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV540APW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV540APW?
SN74LV540APW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV540APW 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 SN74LV540APW?
For technical support, including SN74LV540APW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV540APW requirements.
6.How does Aetrix verify that SN74LV540APW is sourced from the original manufacturer or authorized distributors?
All SN74LV540APW 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 SN74LV540APW meets industry standards.
7.What is the process for return or replacement of SN74LV540APW?
All SN74LV540APW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV540APW, 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 SN74LV540APW part is unused and in its original packaging.
Return procedure for SN74LV540APW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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