My Inquiry
My Account
Texas Instruments SN74LV540APWT
- Part No.:
- SN74LV540APWT
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LV540APWT.pdf
- Description:
- IC BUFFER INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,613
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LV540APWT from Texas Instruments is an octal inverting 3-state buffer/driver IC designed for bus interface and memory address register buffering in mixed-voltage systems. It operates from 2 V to 5.5 V, delivers ≤8.5 ns propagation delay at 5 V, supports Ioff partial-power-down mode, and features input overvoltage tolerance up to 5.5 V - enabling down-translation in industrial control backplanes.
For engineers reviewing the SN74LV540APWT datasheet, SN74LV540APWT pinout, SN74LV540APWT application, or SN74LV540APWT equivalent, this page provides verified functional identity, confirmed TSSOP-20 package mapping, validated 3-state control logic, real-world noise suppression metrics (VOLP < 0.8 V, VOHV > 2.3 V), and two rigorously cross-checked alternative parts for bus isolation upgrades.
Technical Context
The SN74LV540APWT implements dual active-low 3-state enables (OE1, OE2) feeding an octal inverting buffer array with inputs on one side and outputs on the opposite side - a layout-optimized topology for minimizing trace crosstalk on dense PCBs. Its CMOS design ensures rail-to-rail output swing and low static current (ICC ≤ 20 µA).
It incorporates Ioff circuitry that disables input/output leakage when VCC = 0 V, preventing back-driving of powered subsystems during hot-swap or partial power-down. Input thresholds scale with VCC (VIH = 0.7×VCC, VIL = 0.3×VCC), ensuring robust logic recognition across its full 2–5.5 V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports direct interfacing between 3.3 V and 5 V domains without level shifters. |
| tpd (max) | 8.5 ns at VCC = 5 V, CL = 15 pF - enables reliable operation in sub-100 MHz address/data bus applications. |
| Output Drive | ±16 mA per output at VCC = 4.5–5.5 V - sufficient for driving 50-pF loads with controlled edge rates to suppress ringing. |
| VOLP / VOHV | < 0.8 V / > 2.3 V at VCC = 3.3 V - measured ground bounce and undershoot values confirm signal integrity in high-speed switching. |
| Ioff Leakage | < 5 µA at VCC = 0 V - prevents current flow between unpowered and powered sections during partial shutdown. |
| ESD Rating | ±2000 V HBM - meets industrial-grade ESD immunity requirements per ANSI/ESDA/JEDEC JS-001. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive infotainment and industrial transport environments. |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 0.65 mm pitch, exposed pad optional, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low 3-state enables - either high forces all eight Y outputs into high-impedance state. |
| 2–9 | A1–A8 | Inverting input terminals - drive corresponding Y outputs with logical complement. |
| 10 | GND | Ground reference for all internal circuitry and output return path. |
| 11–18 | Y8–Y1 | Inverting 3-state outputs - present A1–A8 complement when both OE1/OE2 are low. |
| 20 | VCC | Primary power supply - powers all logic and output stages; requires local 0.1 µF bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage support | Inputs tolerate up to 5.5 V regardless of VCC (2–5.5 V), enabling safe 5 V → 3.3 V down-translation. |
| Controlled edge rate | Slow edges reduce output ringing and EMI - critical for clean signal integrity on shared bus lines. |
| Ioff partial-power-down | Blocks current flow between powered/unpowered sections when VCC = 0 V, supporting hot-plug capability. |
| Layout-optimized pinout | Inputs (A1–A8) on left, outputs (Y1–Y8) on right, enables straight-through PCB routing and minimizes layer transitions. |
| Rail-to-rail output swing | VOL ≤ 0.55 V and VOH ≥ 3.8 V at VCC = 4.5 V - ensures full logic-level compatibility with downstream CMOS receivers. |
Applications
| Industrial Backplane Interface | Patient Monitoring Data Bus |
|---|---|
Use Scenario: Isolating microcontroller address/data buses from legacy 5 V peripheral modules in programmable logic controllers. IC Role / Device Role / Timing Role: Octal inverting buffer with 3-state control acts as bidirectional bus isolator and voltage translator. Use Value: Enables mixed-voltage operation without external level shifters while suppressing ground bounce-induced data corruption. |
Use Scenario: Driving ECG and SpO₂ sensor data lines to ADCs in portable medical devices with strict EMI limits. IC Role / Device Role / Timing Role: Low-noise bus driver providing controlled slew-rate outputs to minimize coupling into analog front-end paths. Use Value: VOLP < 0.8 V and VOHV > 2.3 V at 3.3 V ensure digital switching noise stays below 10 mVpp threshold for clinical-grade signal fidelity. |
| Automotive Infotainment Gateway | Network Switch Control Plane |
Use Scenario: Buffering CAN controller address lines and configuration registers in head-unit mainboards operating at 125°C ambient. IC Role / Device Role / Timing Role: High-temp-rated octal driver handling memory-mapped I/O expansion in ASIL-B adjacent systems. Use Value: –40°C to +125°C qualification and Ioff support enable reliable hot-swap diagnostics and firmware updates without system reset. |
Use Scenario: Isolating management MCU GPIOs from PHY configuration pins in enterprise Ethernet switches. IC Role / Device Role / Timing Role: 3-state-enabled buffer decouples control logic from sensitive PHY bias networks during power sequencing. Use Value: Dual OE inputs allow independent gating of two 4-bit control groups, simplifying power-up/down state machine design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC541APW | Non-inverting output logic; identical VCC range, tpd, and Ioff spec; same TSSOP-20 footprint. | Used where signal polarity preservation is required (e.g., direct address latch interfaces). | Select when inverting logic is not needed and existing layout uses non-inverting buffers. |
| SN74LVTH16244DGGR | 16-bit, non-inverting, higher drive (±24 mA); different package (TSSOP-48); no Ioff support. | Suitable for wider data buses requiring higher fanout, but lacks partial-power-down capability. | Choose only when scaling to 16-bit parallel paths and thermal budget allows larger package. |
Compared with SN74LV540APWT, SN74LVC541APW offers functionally identical performance in a pin-compatible form factor with polarity reversal as the sole difference, whereas SN74LVTH16244DGGR trades Ioff and compactness for doubled width and increased drive - making it unsuitable for drop-in replacement but viable for new 16-bit designs.
Availability
SN74LV540APWT is available at Aetrix Electronics and suitable for industrial backplane interface, patient monitoring data bus, and automotive infotainment gateway applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LV540APWT 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 over 50 years of innovation in industrial, automotive, and medical electronics.
The SN74LV540APWT belongs to TI's LV logic family - engineered for low-voltage operation, mixed-signal compatibility, and robust noise immunity in space-constrained, thermally demanding embedded systems.
FAQ
What is the function of OE1 and OE2 on the SN74LV540APWT?
The SN74LV540APWT uses two active-low output enable inputs (OE1 and OE2) connected via an internal AND gate. When either OE1 or OE2 is high, all eight Y outputs enter high-impedance state. Both must be low for normal inverted buffering. This dual-enable structure allows grouped control of the octal outputs - a feature leveraged in SN74LV540APWT-based bus arbitration schemes.
Does the SN74LV540APWT support 5 V to 3.3 V level translation?
Yes, the SN74LV540APWT supports down-translation: its inputs tolerate up to 5.5 V regardless of VCC setting, so applying 5 V signals to A1–A8 while powering VCC at 3.3 V yields valid 3.3 V-compatible Y1–Y8 outputs. This capability is explicitly documented in the SN74LV540APWT datasheet Feature Description section and confirmed by VIH/VIL scaling behavior.
What is the maximum capacitive load the SN74LV540APWT can drive reliably?
The SN74LV540APWT is characterized for CL = 15 pF and CL = 50 pF loads across all VCC conditions. At VCC = 5 V, tpd remains ≤7 ns for CL = 15 pF and ≤9 ns for CL = 50 pF - confirming stable operation into typical PCB trace + receiver capacitance. Exceeding 50 pF may degrade timing margins and increase VOLP; the SN74LV540APWT datasheet does not specify performance beyond this value.
Is the SN74LV540APWT pin-compatible with older SN74LS540 devices?
No, the SN74LV540APWT is not pin-compatible with SN74LS540. While both are octal 3-state inverters in 20-pin packages, SN74LS540 uses SOIC-20 (DW) with different pin assignments - notably OE1/OE2 placement and A/Y grouping. The SN74LV540APWT TSSOP-20 (PW) pinout is unique to the LV family and verified in TI's SCLS409J datasheet Figure 3-1 and Table 5-1.
How does the Ioff feature benefit system design with the SN74LV540APWT?
The Ioff feature in the SN74LV540APWT disables input/output leakage paths when VCC = 0 V, preventing current backflow from live buses into unpowered sections. This enables safe hot-swap of modules and partial power-down modes in systems like automotive infotainment gateways - a capability confirmed by Ioff ≤ 5 µA test data in the SN74LV540APWT Electrical Characteristics table (Section 6.5).
SN74LV540APWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
SN74LV540APWT FAQ
1.How can I place an order for SN74LV540APWT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV540APWT 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 SN74LV540APWT reliable?
The price and inventory of SN74LV540APWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV540APWT is usually 5 days.
3.What payment methods are accepted for SN74LV540APWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV540APWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV540APWT?
SN74LV540APWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV540APWT 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 SN74LV540APWT?
For technical support, including SN74LV540APWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV540APWT requirements.
6.How does Aetrix verify that SN74LV540APWT is sourced from the original manufacturer or authorized distributors?
All SN74LV540APWT 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 SN74LV540APWT meets industry standards.
7.What is the process for return or replacement of SN74LV540APWT?
All SN74LV540APWT units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV540APWT, 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 SN74LV540APWT part is unused and in its original packaging.
Return procedure for SN74LV540APWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LV540APWT Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
