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Texas Instruments SN74LVTH240NS
- Part No.:
- SN74LVTH240NS
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVTH240NS.pdf
- Description:
- IC INVERTER DUAL 4-INPUT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,430
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Product details
Overview
SN74LVTH240NS from Fairchild Semiconductor is an inverting octal buffer/line driver with 3-STATE outputs, designed for 3.3V VCC operation while interfacing to 5V TTL systems. It features bushold inputs (eliminating external pull-ups), ±32mA/64mA drive capability, and operates across –40°C to +85°C for memory address and clock bus driving.
For engineers reviewing the SN74LVTH240NS datasheet, SN74LVTH240NS pinout, SN74LVTH240NS application, or SN74LVTH240NS equivalent, this page delivers verified electrical specs, SOIC-20 package details, bushold behavior, 3-STATE timing, and direct alternatives for bus interface design in industrial control and embedded computing.
Technical Context
The SN74LVTH240NS implements dual 4-bit inverting buffers with independent 3-STATE enable controls (OE1/OE2), supporting live insertion/extraction and glitch-free power-up/down high-impedance states. Its BiCMOS process enables ABT-class speed at 3.3V while maintaining TTL-level input compatibility up to 5.5V.
Each output drives –32mA (HIGH) or +64mA (LOW) into loads, with propagation delays as low as 1.1ns (tPLH/tPHL) under 50pF load. Bushold circuitry on all eight data inputs (I0–I7) maintains valid logic states without external biasing when unused.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 3.6V - Ensures stable operation in 3.3V systems with ±0.3V tolerance. |
| IOH/IOL | –32mA / +64mA - Supports heavy bus loading and fanout to multiple TTL inputs. |
| tPLH/tPHL | 1.1ns to 4.6ns - Enables high-speed address/data buffering in memory and peripheral interfaces. |
| Bushold Current | ±75µA at 3.0V - Actively holds floating inputs at valid logic levels without external resistors. |
| Operating Temp | –40°C to +85°C - Qualified for industrial-grade embedded and control applications. |
| ESD Rating | HBM > 2000V - Provides robust handling during board assembly and system integration. |
| Input Voltage Range | 0V to 5.5V - Allows direct connection to 5V logic without level-shifting circuitry. |
Pinout & Package
SN74LVTH240NS is housed in a 20-lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" wide (Package Code M20B), with standard 1.27mm pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-Low 3-STATE enable inputs controlling first and second group of four outputs respectively. |
| 2–9 | I0–I7 | Inverting data inputs with bushold - retain last valid state when unconnected or floating. |
| 11–18 | O0–O7 | Inverting 3-STATE outputs - HIGH/LOW driven or high-impedance based on OE1/OE2 state. |
| 10 | GND | Ground reference for all internal circuitry and output current return path. |
| 20 | VCC | 3.3V supply pin - powers BiCMOS core; must be decoupled locally per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Bushold Inputs | Eliminates need for 10kΩ pull-up resistors on I0–I7, reducing BOM count and PCB area in bus-hold configurations. |
| 5V-Tolerant Inputs | Accepts 0–5.5V input signals directly, enabling seamless interfacing between 3.3V logic and legacy 5V peripherals. |
| High-Drive Outputs | Sinks 64mA per output (LOW) and sources 32mA (HIGH), supporting ≥10 LVTTL loads or driving unterminated traces. |
| Glitch-Free Power Sequencing | Outputs remain high-impedance during power-up/down transitions, preventing bus contention in hot-swap systems. |
| Live Insertion Support | Withstands voltage transients during hot-plug events, making it suitable for modular backplane and card-edge applications. |
Applications
| Memory Address Buffering | Industrial Bus Transceiver |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a 3.3V microcontroller to multiple 5V SRAM chips on a shared bus. IC Role / Device Role / Timing Role: Inverting octal buffer providing level translation, fanout amplification, and bus isolation via 3-STATE control. Use Value: Eliminates external level shifters and pull-ups while ensuring sub-5ns propagation delay meets SRAM access timing. |
Use Scenario: Isolating PLC I/O module data lanes between 3.3V FPGA logic and 5V fieldbus transceivers. IC Role / Device Role / Timing Role: Bidirectional bus driver with independent OE control for direction management and noise suppression. Use Value: Bushold prevents floating inputs during configuration gaps; ±64mA drive sustains signal integrity over 15cm ribbon cables. |
| Embedded Clock Distribution | Legacy Peripheral Interface |
|
Use Scenario: Distributing a 3.3V system clock to multiple 5V-compatible peripherals (e.g., UARTs, timers) with matched skew. IC Role / Device Role / Timing Role: Low-skew inverting buffer (tOSHL/tOSLH ≤ 1.0ns) minimizing clock phase error across destinations. Use Value: Sub-nanosecond output-to-output skew ensures synchronous sampling across multiple devices without added deskew circuitry. |
Use Scenario: Interfacing a modern ARM-based SoC to legacy ISA-bus peripherals operating at 5V TTL levels. IC Role / Device Role / Timing Role: Voltage-tolerant line driver translating 3.3V control/data signals to 5V-compliant bus voltages. Use Value: Direct 5.5V input tolerance and 64mA sink capability allow reliable handshake signaling without discrete level translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer with 3-STATE and bushold applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVT240NS | No bushold inputs; requires external pull-ups on unused I0–I7 pins. | Suitable where input biasing is already implemented or unused inputs are tied. | Select when bushold is unnecessary and cost minimization is prioritized. |
| 74ALVC240PW | Lower drive (±24mA), no bushold, 1.65–3.6V VCC, TSSOP-20 only. | Better for ultra-low-power 1.8V/2.5V systems; not 5V-tolerant. | Choose for battery-powered designs requiring wider VCC range but sacrificing 5V interface capability. |
Compared with SN74LVT240NS and 74ALVC240PW, the SN74LVTH240NS uniquely combines bushold, 5V-tolerant inputs, and ±32mA/64mA drive in SOIC-20 - making it optimal for industrial bus interfaces where reliability, layout simplicity, and mixed-voltage interoperability are critical.
Availability
SN74LVTH240NS is available at Aetrix Electronics and suitable for industrial control systems, embedded memory subsystems, and legacy peripheral interfacing requiring stable component supply, long-term lifecycle support, and consistent SOIC-20 sourcing.
Supply support for SN74LVTH240NS 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
Fairchild Semiconductor was a leading designer of high-performance analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.
The SN74LVTH240NS belongs to Fairchild's LVT/H series of low-voltage BiCMOS buffers, engineered specifically for 3.3V systems needing robust 5V interface capability, bus hold functionality, and industrial temperature operation.
FAQ
What is the function of bushold in SN74LVTH240NS?
The bushold circuitry in SN74LVTH240NS actively maintains the last valid logic state on each input (I0–I7) when left unconnected or floating, eliminating the need for external pull-up or pull-down resistors. This reduces component count and improves reliability in high-density PCB layouts where input routing is constrained. SN74LVTH240NS uses ±75µA bushold current at 3.0V to achieve this behavior.
Can SN74LVTH240NS interface directly with 5V logic?
Yes, SN74LVTH240NS supports 5V-tolerant inputs - its VI rating extends to 5.5V, allowing direct connection to 5V TTL outputs without level-shifting circuitry. The device operates from a 3.3V supply (2.7–3.6V), and its outputs swing rail-to-rail within that domain while maintaining compatibility with 5V input thresholds. This makes SN74LVTH240NS ideal for mixed-voltage bus bridging.
What is the maximum output drive capability of SN74LVTH240NS?
SN74LVTH240NS delivers –32mA source current (HIGH state) and +64mA sink current (LOW state) per output, exceeding standard LVTTL requirements. This enables driving multiple 5V TTL loads (≥10 units) or sustaining signal integrity over longer PCB traces. The specification is guaranteed across –40°C to +85°C and applies independently to each of the eight O0–O7 outputs.
Does SN74LVTH240NS support hot-swap or live insertion?
Yes, SN74LVTH240NS is explicitly rated for live insertion/extraction per its datasheet. Its power-up/down high-impedance feature ensures outputs remain in 3-STATE during supply ramp-up or ramp-down, preventing bus contention. Combined with ESD protection (>2000V HBM) and latch-up immunity (>500mA), SN74LVTH240NS is qualified for modular backplane and field-replaceable unit applications.
What package type is used for SN74LVTH240NS?
SN74LVTH240NS is supplied in a 20-lead Small Outline Integrated Circuit (SOIC) package, JEDEC MS-013 compliant, 0.300" wide (Package Code M20B). It features 1.27mm lead pitch, gull-wing terminations, and is lead-free per JEDEC J-STD-020B. This package is compatible with standard surface-mount reflow processes and widely supported in industrial PCB assembly lines.
SN74LVTH240NS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Bulk
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74LVTH240NS FAQ
1.How can I place an order for SN74LVTH240NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH240NS 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 SN74LVTH240NS reliable?
The price and inventory of SN74LVTH240NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH240NS is usually 5 days.
3.What payment methods are accepted for SN74LVTH240NS?
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SN74LVTH240NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH240NS 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 SN74LVTH240NS?
For technical support, including SN74LVTH240NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH240NS requirements.
6.How does Aetrix verify that SN74LVTH240NS is sourced from the original manufacturer or authorized distributors?
All SN74LVTH240NS 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 SN74LVTH240NS meets industry standards.
7.What is the process for return or replacement of SN74LVTH240NS?
All SN74LVTH240NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH240NS, 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 SN74LVTH240NS part is unused and in its original packaging.
Return procedure for SN74LVTH240NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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