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Texas Instruments SN74LV240ADBRE4
- Part No.:
- SN74LV240ADBRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LV240ADBRE4.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,502
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Product details
Overview
SN74LV240ADBRE4 from Texas Instruments is an octal inverting buffer/driver with 3-state outputs, designed for 2V–5.5V VCC operation. It features dual 4-bit channels with independent output-enable (OE) inputs, 6.5ns max propagation delay at 5V, 5.5V-tolerant inputs, and Ioff support for live insertion. It serves as a bus-oriented transceiver in memory address and clock distribution systems.
For engineers reviewing the SN74LV240ADBRE4 datasheet, SN74LV240ADBRE4 pinout, SN74LV240ADBRE4 application, or SN74LV240ADBRE4 equivalent, key selection criteria include its 3-state drive capability, mixed-mode voltage translation, ground-bounce performance (<0.8V), and compatibility with 20-pin SSOP (DB) layout constraints in space-constrained industrial and portable designs.
Technical Context
The SN74LV240ADBRE4 implements two independent 4-bit inverting buffers, each controlled by its own OE input (1OE on Pin 1, 2OE on Pin 19). When OE is low, inverted data passes from A-inputs to Y-outputs; when high, outputs enter high-impedance state - enabling bidirectional bus control without external logic.
Its CMOS design supports down-translation: inputs tolerate up to 5.5V regardless of VCC (2V–5.5V), while Ioff ensures negligible leakage (<5 µA) when VCC = 0V - critical for partial power-down and hot-swap scenarios in network switches and wearable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 5.5V - enables single-supply operation across 2.5V, 3.3V, and 5V logic domains |
| Max tpd | 6.5ns at 5V, CL = 15pF - ensures timing-critical clock and address buffering in high-speed digital interfaces |
| Input Voltage Tolerance | Up to 5.5V - allows interfacing with higher-voltage controllers while powered from lower VCC |
| Ioff Leakage | <5 µA at 0V VCC - prevents back-drive and enables safe live insertion in modular backplanes |
| Output Drive | ±16mA at 4.5V VCC - sufficient to drive multiple CMOS loads or light stubs on shared buses |
| Operating Temp | –40°C to +125°C - qualified for extended industrial and automotive under-hood environments |
| VOLP / VOHV | <0.8V ground bounce and >2.3V undershoot at 3.3V - reduces signal integrity risk in dense PCB layouts |
Pinout & Package
SN74LV240ADBRE4 uses the 20-pin SSOP (DB) package: 7.2mm × 7.8mm body size, 0.65mm lead pitch, gull-wing leads. This compact surface-mount package supports automated assembly and thermal dissipation up to 94.5°C/W (RθJA).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Active-low enable for first 4-bit channel | Controls inversion and 3-state behavior of Y1–Y4 outputs; tied low for always-active mode |
| 1A1–1A4 | Inverted data inputs (Channel 1) | Accept 5.5V-tolerant signals; drive corresponding Y1–Y4 outputs when 1OE = L |
| 2Y1–2Y4 | Inverted outputs (Channel 2) | High-impedance when 2OE = H; sink/source up to ±16mA when enabled |
| 2OE | Active-low enable for second 4-bit channel | Independent control enables time-multiplexed bus sharing between two subsystems |
| VCC (Pin 20) | Power supply | Must be bypassed with 0.1µF ceramic capacitor placed ≤2mm from pin to suppress switching noise |
| GND (Pin 10) | Reference ground | Shared return path for all I/O; requires low-inductance connection to minimize ground bounce |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2V–5.5V) | Eliminates level-shifters in mixed-voltage systems such as smartphone baseband-to-application processor interconnects |
| 5.5V-tolerant inputs | Permits direct connection to legacy 5V peripherals without external clamping diodes or resistors |
| Ioff support | Enables safe board replacement in powered-backplane systems like telecom line cards without system shutdown |
| Low ground bounce (<0.8V) | Reduces simultaneous switching noise (SSN), improving signal integrity in high-density memory modules |
| Latch-up immunity >250mA | Meets JESD17 requirements - ensures robustness against transient overvoltage events in industrial control cabinets |
Applications
| Memory Address Buffering | Industrial Network Switch Interface |
|---|---|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM/Flash devices on a shared bus. IC Role / Device Role / Timing Role: Inverting 3-state buffer isolating address signals during bus arbitration; enables multi-drop topology with minimal propagation delay. Use Value: 6.5ns max tpd at 5V ensures setup/hold timing margins are preserved across temperature and voltage corners. | Use Scenario: Level-translating and enabling/disabling control signals between 3.3V switch fabric ASIC and 5V management MCU. IC Role / Device Role / Timing Role: Dual-channel voltage-tolerant buffer providing isolated enable control for PHY reset and LED status lines. Use Value: Ioff and 5.5V input tolerance allow hot-plug insertion of daughter cards without disrupting upstream 3.3V logic rails. |
| Wearable Sensor Hub Interface | Smartphone Baseband Subsystem |
Use Scenario: Interfacing low-power sensor hub MCU (2.5V) with multiple 3.3V environmental sensors (accelerometer, gyroscope). IC Role / Device Role / Timing Role: Octal inverting driver translating logic levels while providing bus contention protection via 3-state outputs. Use Value: Sub-1µA ICC at 2.5V minimizes quiescent current impact on battery life in always-on sensing modes. | Use Scenario: Isolating and buffering clock and control signals between AP and modem in LTE/5G handsets. IC Role / Device Role / Timing Role: Low-noise inverting buffer driving clock distribution tree with minimized VOLP-induced jitter. Use Value: Typical VOLP <0.8V at 3.3V directly improves clock edge fidelity and reduces bit error rates in high-speed serial links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC240APWR | Lower VCC min (1.65V), higher drive (±24mA), same 20-pin TSSOP (PW) footprint | Better suited for ultra-low-voltage SoC interfaces but lacks Ioff and has tighter VCC regulation needs | Select when operating below 2V or requiring higher fanout; verify thermal derating at 125°C |
| 74AHC240PW | Higher speed (4.5ns @ 5V), wider VCC (2–5.5V), but no Ioff and only 5V-tolerant inputs | Preferred for fixed 5V systems needing faster timing, but unsuitable for partial power-down or mixed-voltage hot-swap | Choose for legacy 5V-only designs where ground bounce and live insertion are not concerns |
Compared with SN74LV240ADBRE4, SN74LVC240APWR offers greater drive strength and lower voltage operation but sacrifices Ioff and robustness in unpowered states; 74AHC240PW delivers superior speed but lacks voltage translation and hot-swap safety - making SN74LV240ADBRE4 the optimal choice for industrial and portable systems demanding mixed-voltage interoperability and live-insertion reliability.
Availability
SN74LV240ADBRE4 is available at Aetrix Electronics and suitable for industrial network switches, wearable sensor hubs, memory subsystems, and smartphone baseband interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LV240ADBRE4 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 90 years of innovation in industrial, automotive, and consumer electronics.
The SN74LV240ADBRE4 belongs to TI's LV-A family of low-voltage, high-noise-immunity logic devices, engineered specifically to replace obsolete TTL and earlier CMOS buffers in memory addressing, clock distribution, and bus interface applications where reliability, voltage flexibility, and Ioff safety are critical.
FAQ
What is the maximum propagation delay of the SN74LV240ADBRE4 at 3.3V?
The SN74LV240ADBRE4 has a maximum propagation delay (tpd) of 9ns at VCC = 3.3V ±0.3V with CL = 15pF and TA = 25°C. This value is confirmed in Section 5.7 of the official datasheet and reflects worst-case timing for A→Y transitions under standard load conditions - critical for validating setup/hold margins in 3.3V memory or peripheral interfaces.
Does the SN74LV240ADBRE4 support live insertion when VCC is unpowered?
Yes, the SN74LV240ADBRE4 supports live insertion due to its Ioff feature, which limits input/output leakage to <5 µA when VCC = 0V. This allows the device to be safely inserted into a powered backplane without disrupting adjacent circuitry - a requirement verified in Section 7.3 and Table 5.5 of the TI datasheet for industrial modular systems.
What package type does the SN74LV240ADBRE4 use, and what are its dimensions?
The SN74LV240ADBRE4 uses the 20-pin SSOP (DB) package with a body size of 7.2mm × 5.30mm and overall package size of 7.2mm × 7.8mm. This information is explicitly listed in the Package Information table and confirmed in the PACKAGE OPTION ADDENDUM, where SN74LV240ADBRE4 is designated as "SSOP (DB) | 20".
Can the SN74LV240ADBRE4 interface between 5V and 3.3V logic domains?
Yes, the SN74LV240ADBRE4 supports mixed-mode voltage operation: its inputs tolerate up to 5.5V regardless of VCC (2V–5.5V), enabling direct connection to 5V outputs while powered from 3.3V. This down-translation capability is documented in Section 7.3 and validated in the Recommended Operating Conditions table (Section 5.3).
What is the thermal resistance (RθJA) of the SN74LV240ADBRE4 in its SSOP package?
The SN74LV240ADBRE4 in the SSOP (DB) package has a junction-to-ambient thermal resistance (RθJA) of 94.5°C/W, as specified in Section 5.4 of the datasheet. This value assumes standard JEDEC 2-layer board conditions and is essential for calculating junction temperature rise under continuous 16mA output loading at 125°C ambient.
SN74LV240ADBRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- 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-SSOP
SN74LV240ADBRE4 FAQ
1.How can I place an order for SN74LV240ADBRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV240ADBRE4 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 SN74LV240ADBRE4 reliable?
The price and inventory of SN74LV240ADBRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV240ADBRE4 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV240ADBRE4 transactions.
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4.How is shipping managed for SN74LV240ADBRE4?
SN74LV240ADBRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV240ADBRE4 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 SN74LV240ADBRE4?
For technical support, including SN74LV240ADBRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV240ADBRE4 requirements.
6.How does Aetrix verify that SN74LV240ADBRE4 is sourced from the original manufacturer or authorized distributors?
All SN74LV240ADBRE4 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 SN74LV240ADBRE4 meets industry standards.
7.What is the process for return or replacement of SN74LV240ADBRE4?
All SN74LV240ADBRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV240ADBRE4, 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 SN74LV240ADBRE4 part is unused and in its original packaging.
Return procedure for SN74LV240ADBRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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