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Texas Instruments SN74LVC240APWT
- Part No.:
- SN74LVC240APWT
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC240APWT.pdf
- Description:
- IC BUFFER INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:729
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Product details
Overview
SN74LVC240APWT from Texas Instruments is an octal noninverting buffer/driver with dual 3-state output banks, operating from 1.65V to 3.6V supply, supporting 5.5V-tolerant inputs, delivering ≤6.5ns propagation delay at 3.3V, and enabling mixed-mode signal interfacing (e.g., 5V logic driving 3.3V bus). It is used in digital signal redriving, transmission line termination, and controller reset hold applications.
For engineers reviewing the SN74LVC240APWT datasheet, SN74LVC240APWT pinout, SN74LVC240APWT application, or SN74LVC240APWT equivalent, key selection criteria include its dual independent 3-state control (1OE/2OE), Ioff support for live insertion, ±50mA output drive, 3.3V-compatible timing with 5V input tolerance, and TSSOP-20 package footprint compatibility with space-constrained PCB layouts.
Technical Context
The SN74LVC240APWT implements two independent 4-channel buffer banks, each controlled by a dedicated active-low output enable (1OE, 2OE), allowing selective tri-state control of subsets of outputs without affecting the other bank. Its CMOS architecture provides balanced sourcing/sinking capability (±50mA) and supports voltage-level translation across 1.65V–3.6V VCC while accepting up to 5.5V on inputs.
It features Ioff circuitry that disables all outputs when VCC = 0V, preventing back-drive current and enabling partial power-down operation. The device exhibits low ground bounce (<0.8V) and undershoot (>2V) at 3.3V, ensuring signal integrity during fast switching into light capacitive loads (≤50pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - Enables direct integration into 3.3V and 2.5V systems without level shifters. |
| Input Voltage Tolerance | Up to 5.5V - Allows safe interfacing with legacy 5V logic without external clamping. |
| tpd (Max) | 6.5ns at VCC = 3.3V - Supports >100MHz signal redriving in high-speed digital buses. |
| Output Drive | ±50mA per pin - Sustains robust drive into transmission lines or multiple CMOS inputs. |
| Ioff Leakage | ±20μA max at VCC = 0V - Prevents disruptive current flow during hot-swap or partial power-down. |
| ESD Rating | ±2000V HBM - Meets industrial handling requirements without additional protection circuitry. |
| Operating Temp | –40°C to +125°C - Qualified for automotive under-hood and industrial control environments. |
Pinout & Package
Packaged in a 20-pin TSSOP (PW), the SN74LVC240APWT measures 6.5mm × 6.4mm with a 0.65mm lead pitch and exposed thermal pad (not electrically connected in PW variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 19OE | Active-low bank enable inputs | Independently disable Bank 1 (pins 2,4,6,8 → 18,16,14,12) or Bank 2 (pins 3,5,7,9 → 17,15,13,11); both must be low for full output activation. |
| 1A1–1A4, 2A1–2A4 | Input terminals (8 total) | Noninverting inputs mapped 1:1 to corresponding Y outputs; tolerate 0–5.5V regardless of VCC. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs (8 total) | Drive high/low or enter high-Z state based on OE; output voltage swing is rail-to-rail (0V to VCC) with defined VOL/VOH. |
| VCC (Pin 20), GND (Pin 10) | Power supply terminals | Single-supply operation; requires local 0.1μF bypass capacitor between VCC and GND per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal interface | Enables 5V inputs to safely drive 3.3V-bused systems without level translators or clamping diodes. |
| Dual independent 3-state control | Allows concurrent management of two signal groups (e.g., address vs. data bus segments) using separate OE pins. |
| Ioff partial-power-down protection | Eliminates back-drive current when VCC is off, supporting hot-plug and power-gating architectures. |
| Low ground bounce & undershoot | Reduces EMI and signal distortion during simultaneous switching, critical for clean bus signaling. |
| High noise immunity | Guaranteed VIH/VIL margins across full VCC range ensure reliable logic recognition in noisy industrial environments. |
Applications
| Bus Signal Redriving | Controller Reset Hold |
|---|---|
Use Scenario: Repeating degraded clock or data signals across long PCB traces (>12 cm) or multi-drop buses. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control acts as a repeater stage, restoring edge rate and drive strength while isolating source from load capacitance. Use Value: Maintains signal integrity via ≤6.5ns tpd and ±50mA drive, enabling reliable communication over impedance-mismatched traces without external damping resistors in many cases. | Use Scenario: Holding peripheral bus lines stable during microcontroller reset or firmware update cycles. IC Role / Device Role / Timing Role: Octal buffer placed between controller and peripherals; 3-state outputs freeze bus state when OE is asserted during reset. Use Value: Prevents spurious writes or glitches on shared buses (e.g., SPI, parallel memory) by forcing high-impedance isolation exactly when needed. |
| LED Indicator Driving | Transmission Line Interface |
Use Scenario: Directly driving multiple status LEDs from low-current GPIOs in embedded systems. IC Role / Device Role / Timing Role: Current-boosting buffer converting weak MCU outputs into 24mA-capable LED drivers (per channel, at 3V). Use Value: Eliminates need for discrete transistors or current-limiting resistors on MCU side; simplifies BOM and layout while maintaining brightness control via PWM input. | Use Scenario: Driving controlled-impedance traces (e.g., 50Ω) in industrial fieldbus or test equipment interfaces. IC Role / Device Role / Timing Role: High-speed buffer providing matched rise/fall times and low output impedance to minimize reflections. Use Value: Delivers <0.8V ground bounce and >2V VOH undershoot at 3.3V, reducing jitter and bit errors in point-to-point or stubbed line topologies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APW | Noninverting octal buffer with identical pinout, same VCC range and I/O specs, but single OE pin controlling all 8 outputs. | Lacks independent bank control; unsuitable where split-bus isolation is required. | Select SN74LVC244APW only when unified enable suffices and board layout rework is acceptable. |
| 74LVC240ADW | Same logic function and electrical specs, but in SOIC-20 (12.8mm × 10.3mm) instead of TSSOP-20 (6.5mm × 6.4mm). | Requires larger PCB area and higher thermal resistance (RθJA = 114.8°C/W vs. 120.3°C/W). | Choose 74LVC240ADW only if SOIC footprint is already committed and thermal margin permits. |
Compared with SN74LVC240APWT, SN74LVC244APW sacrifices bank-level control for simpler enable routing, while 74LVC240ADW trades compactness and thermal performance for through-hole or legacy SOIC compatibility-neither offers pin-to-pin replacement without layout changes.
Availability
SN74LVC240APWT is available at Aetrix Electronics and suitable for industrial automation interfaces, automotive body control modules, and telecom infrastructure equipment requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SN74LVC240APWT 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 logic solutions, with decades of expertise in high-reliability logic families.
The SN74LVC240APWT belongs to the LVC (Low-Voltage CMOS) logic family, designed specifically for low-voltage, high-speed, mixed-signal interfacing in space- and power-constrained applications across industrial, automotive, and communications markets.
FAQ
What is the maximum capacitive load the SN74LVC240APWT can drive while meeting all datasheet specifications?
The SN74LVC240APWT is specified to drive loads ≤50pF while maintaining guaranteed timing (tpd ≤6.5ns), VOL/VOH levels, and switching characteristics. Exceeding 50pF may increase propagation delay, degrade edge rates, and risk violating VOL/VOH limits-especially at higher frequencies or temperature extremes. For heavier loads, consider adding series damping or using a driver with higher Cpd rating. The SN74LVC240APWT datasheet explicitly states this 50pF limit in Section 8.2.1.1.
Does the SN74LVC240APWT support true 5V-to-3.3V level translation?
Yes-the SN74LVC240APWT accepts input voltages up to 5.5V while operating from a 1.65V–3.3V VCC, enabling robust 5V-to-3.3V unidirectional level translation without external components. Its inputs are overvoltage tolerant, and outputs swing rail-to-rail (0V to VCC), so a 3.3V-powered SN74LVC240APWT outputs 0–3.3V logic levels when driven by 5V signals. This behavior is confirmed in Sections 1 (Features) and 5.3 (Recommended Operating Conditions) of the official datasheet.
Can both output enable pins (1OE and 2OE) of the SN74LVC240APWT be tied together?
Yes-1OE and 2OE can be connected to a common control signal if independent bank control is unnecessary. Doing so converts the SN74LVC240APWT into a standard octal buffer with unified 3-state control, functionally equivalent to SN74LVC244APW. However, tying them together forfeits the key advantage of split-bank isolation. TI's datasheet Figure 7-1 and Table 7-1 confirm identical functional behavior per bank, making combined OE operation electrically valid and widely used in simplified designs.
What is the purpose of the thermal pad on the SN74LVC240APWT package?
The SN74LVC240APWT in TSSOP-20 (PW) package does not include a thermal pad-the thermal pad reference in the datasheet applies exclusively to the RKS (VQFN-20) variant. The PW package uses standard gull-wing leads; its thermal performance relies on copper pour under the body and proper PCB trace width. Thermal metrics for PW (RθJA = 120.3°C/W) are published in Section 5.4 and assume no thermal pad connection. Confusing this with RKS-package documentation is a common error-always verify package suffix (PWT = PW, not RKS).
How does Ioff functionality benefit system design with the SN74LVC240APWT?
Ioff in the SN74LVC240APWT disables all outputs and limits leakage to ±20μA when VCC = 0V, enabling safe live insertion of daughterboards, partial power-down of subsystems, and prevention of back-drive current into powered ICs. This eliminates need for external isolation switches or complex power sequencing. The feature is validated per JESD78 and documented in Section 7.3.2 and Table 5.5 (Ioff parameter), making SN74LVC240APWT suitable for hot-swap and modular power-architectures where reliability under dynamic supply conditions is critical.
SN74LVC240APWT 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:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74LVC240APWT FAQ
1.How can I place an order for SN74LVC240APWT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC240APWT 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 SN74LVC240APWT reliable?
The price and inventory of SN74LVC240APWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC240APWT is usually 5 days.
3.What payment methods are accepted for SN74LVC240APWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC240APWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC240APWT?
SN74LVC240APWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC240APWT 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 SN74LVC240APWT?
For technical support, including SN74LVC240APWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC240APWT requirements.
6.How does Aetrix verify that SN74LVC240APWT is sourced from the original manufacturer or authorized distributors?
All SN74LVC240APWT 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 SN74LVC240APWT meets industry standards.
7.What is the process for return or replacement of SN74LVC240APWT?
All SN74LVC240APWT units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC240APWT, 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 SN74LVC240APWT part is unused and in its original packaging.
Return procedure for SN74LVC240APWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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