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onsemi 74LVTH240SJ
- Part No.:
- 74LVTH240SJ
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74LVTH240SJ.pdf
- Description:
- IC BUFFER INVERT 3.6V 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,438
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Product details
Overview
74LVTH240SJ from Fairchild Semiconductor is an inverting octal buffer/line driver with 3-STATE outputs, designed for low-voltage (3.3V) bus interface applications requiring TTL-level compatibility with 5V systems. It features bushold inputs eliminating external pull-ups, ±32mA/64mA drive capability, and operates across –40°C to +85°C.
For engineers reviewing the 74LVTH240SJ datasheet, pinout, applications, or equivalent options, key selection criteria include bushold input support, 20-pin SOP package (M20D), 3.3V supply with 5V-tolerant I/O, and high-current 3-STATE output drive for memory address and clock distribution.
Technical Context
The 74LVTH240SJ implements dual 4-bit inverting buffers with independent 3-STATE enable controls (OE1, OE2), each managing four outputs (O0–O3 and O4–O7). Its bushold circuitry actively maintains input logic state without external biasing, reducing board space and component count in sparse-bus configurations.
Designed using advanced BiCMOS technology, it achieves ABT-class speed (tPLH/tPHL ≤ 4.6 ns at 3.3V) while maintaining low static current (ICCZ = 0.19 mA) and robust ESD protection (>2000V HBM). The device supports live insertion/extraction and glitch-free power-up/down transitions via high-impedance outputs.
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 high-fanout TTL loads and drives multiple 5V inputs directly. |
| tPLH/tPHL | ≤4.6 ns (CL = 50pF) - Enables use in high-speed address/data bus timing paths up to ~200 MHz. |
| VIH/VIL | 2.0V / 0.8V - Guarantees reliable logic recognition across temperature and voltage corners. |
| II(HOLD) | ±75 µA at 3.0V - Bushold strength sufficient to retain state against typical PCB leakage and noise. |
| ESD Rating | >2000V HBM - Meets industrial system robustness requirements without additional protection. |
| Operating Temp | –40°C to +85°C - Qualified for extended-temperature industrial and telecom equipment. |
Pinout & Package
74LVTH240SJ is housed in a 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm wide (Package Code M20D), with standard 0.65mm lead pitch and gull-wing terminations.
| 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, 11–18 | I0–I7 | Inverting data inputs; bushold-enabled to hold last valid state when floating. |
| 3–6, 15–18 | O0–O7 | Inverting 3-STATE outputs; sink 64mA / source 32mA with rail-to-rail 5V-tolerant swing. |
| 10 | GND | Ground reference for all logic and output stages; separate from power return path in layout-sensitive designs. |
| 20 | VCC | 3.3V supply input; decoupling required within 10mm due to fast switching transients. |
Key Features
| Feature | Design Value |
|---|---|
| Bushold inputs | Eliminates need for 8 external pull-up resistors on unused data lines, reducing BOM cost and PCB area. |
| 5V-tolerant I/O | Accepts 0–5.5V input signals and drives 5V TTL loads directly from 3.3V supply-no level shifters required. |
| Glitch-free power sequencing | Outputs remain high-impedance during VCC ramp-up/down, preventing bus contention in hot-swap or multi-rail systems. |
| Live insertion/extraction support | Enables field-replaceable modules without powering down backplane-critical for telecom line cards and servers. |
| High-current 3-STATE drive | 64mA sink per output allows driving ≥10 standard TTL loads or long trace buses with minimal signal degradation. |
Applications
| Memory Address Buffering | Clock Distribution |
|---|---|
Use Scenario: Driving 32-bit address bus from low-voltage microcontroller to 5V SRAM or Flash memory. IC Role / Device Role / Timing Role: Inverting octal buffer providing level translation and fanout amplification between 3.3V core and 5V memory subsystem. Use Value: Bushold prevents address glitches during reset or standby; 64mA drive ensures setup/hold timing margins under full load. |
Use Scenario: Distributing CPU clock to multiple 5V peripheral ICs in embedded control system. IC Role / Device Role / Timing Role: Low-skew (≤1.0 ns) inverting buffer isolating clock source from capacitive loading of downstream devices. Use Value: tOSHL/tOSLH ≤1.0 ns minimizes clock skew across eight outputs; 3.3V operation reduces system power vs. 5V alternatives. |
| Bus Transceiver Interface | Hot-Swappable Module Control |
Use Scenario: Bidirectional data bus isolation between 3.3V FPGA and legacy 5V ISA-style peripheral card. IC Role / Device Role / Timing Role: Direction-controlled octal buffer enabling controlled data flow with 3-STATE disable for bus release. Use Value: Independent OE1/OE2 pins allow interleaved access to two 4-bit sub-buses; 5V-tolerant I/O avoids level-shifter complexity. |
Use Scenario: Enabling/disabling power and signal paths in modular telecom shelf with live-insertion capability. IC Role / Device Role / Timing Role: Bus driver with glitch-free power-up behavior ensuring no spurious signals during module insertion/removal. Use Value: Power-up high-impedance state prevents backfeeding or contention; ESD rating >2000V HBM withstands handling discharge events. |
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 |
|---|---|---|---|
| SN74LVC240APWR | No bushold; CMOS input structure; lower drive (±24mA); 1.65–3.6V VCC range. | Suitable for pure 3.3V systems without 5V interfacing; requires external pull-ups on unused inputs. | Select when lower power and smaller footprint (TSSOP-20) outweigh need for 5V-tolerance and bushold. |
| 74ALVT240MTCX | Higher speed (tPD ≤ 2.8 ns); same bushold and 5V-tolerance; 2.3–3.6V VCC; TSSOP-20 package. | Better suited for >100 MHz clock distribution where propagation delay skew is critical. | Choose for performance-critical timing paths where 74LVTH240SJ's 4.6 ns max delay is marginal. |
Compared with SN74LVC240APWR and 74ALVT240MTCX, the 74LVTH240SJ uniquely balances 5V-tolerant I/O, bushold, and industrial temperature range in a cost-effective SOP package-making it optimal for mixed-voltage legacy interface upgrades.
Availability
74LVTH240SJ is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, bus transceiver interfaces, and hot-swappable module control requiring stable component supply across industrial temperature ranges.
Supply support for 74LVTH240SJ 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 analog and power IC manufacturer, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and telecom infrastructure.
The 74LVTH240SJ belongs to the LVT/H series of low-voltage BiCMOS buffers, engineered specifically for seamless 3.3V-to-5V system interfacing with enhanced drive strength and robustness.
FAQ
What is the function of bushold in the 74LVTH240SJ?
The bushold feature in the 74LVTH240SJ actively retains the last valid logic state on each input (I0–I7) when left unconnected, eliminating the need for external pull-up or pull-down resistors. This reduces component count and PCB area in systems with partially used data buses. The 74LVTH240SJ specifies ±75 µA bushold drive strength at 3.0V, sufficient to overcome typical board leakage currents without affecting signal integrity during active operation.
Does the 74LVTH240SJ support live insertion into a powered backplane?
Yes, the 74LVTH240SJ supports live insertion and extraction due to its power-up/down high-impedance behavior and bus-friendly 3-STATE architecture. During power application or removal, outputs remain in high-impedance state, preventing bus contention or backfeeding. This capability is validated in the datasheet and makes the 74LVTH240SJ suitable for modular telecom and server applications where field-replaceable units require hot-swap compliance.
What are the absolute maximum ratings for VCC and VI in the 74LVTH240SJ?
The 74LVTH240SJ has an absolute maximum VCC rating of –0.5V to +4.6V and a DC input voltage (VI) rating of –0.5V to +7.0V. These limits ensure survivability during transient overvoltage events, such as ESD or supply rail overshoot. However, recommended operating conditions restrict VCC to 2.7–3.6V and VI to 0–5.5V to guarantee full functionality, timing compliance, and long-term reliability across –40°C to +85°C.
How does the 74LVTH240SJ differ from the non-H (74LVT240SJ) variant?
The 74LVTH240SJ includes bushold inputs, whereas the 74LVT240SJ does not. Both share identical pinout, package, 3-STATE control, drive strength (±32mA/64mA), and 5V-tolerant I/O. The bushold feature in the 74LVTH240SJ eliminates external pull-up resistors on unused inputs-reducing BOM cost and improving noise immunity in sparse-bus configurations. Designers selecting between them must verify whether unused inputs will be left floating in their application.
What is the output skew specification for the 74LVTH240SJ?
The 74LVTH240SJ guarantees output-to-output skew (tOSHL and tOSLH) of ≤1.0 ns across all eight outputs when switching in the same direction. This tight skew enables synchronous timing across parallel data or address lines, making the 74LVTH240SJ suitable for high-speed bus applications where inter-output timing alignment is critical-such as memory address latching or clock fanout to multiple peripherals.
74LVTH240SJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVTH
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-SOP
74LVTH240SJ FAQ
1.How can I place an order for 74LVTH240SJ through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVTH240SJ 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 74LVTH240SJ reliable?
The price and inventory of 74LVTH240SJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVTH240SJ is usually 5 days.
3.What payment methods are accepted for 74LVTH240SJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVTH240SJ transactions.
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4.How is shipping managed for 74LVTH240SJ?
74LVTH240SJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVTH240SJ 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 74LVTH240SJ?
For technical support, including 74LVTH240SJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVTH240SJ requirements.
6.How does Aetrix verify that 74LVTH240SJ is sourced from the original manufacturer or authorized distributors?
All 74LVTH240SJ 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 74LVTH240SJ meets industry standards.
7.What is the process for return or replacement of 74LVTH240SJ?
All 74LVTH240SJ units undergo pre-shipment inspection (PSI). If there is an issue with 74LVTH240SJ, 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 74LVTH240SJ part is unused and in its original packaging.
Return procedure for 74LVTH240SJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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