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onsemi 74LVTH245SJX
- Part No.:
- 74LVTH245SJX
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74LVTH245SJX.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,449
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Product details
Overview
74LVTH245 from Fairchild Semiconductor is a low-voltage octal bidirectional transceiver with 3-STATE inputs/outputs, designed for bus-oriented data transfer between 3.3V and 5V systems. It features bushold inputs (eliminating external pull-ups), ±32 mA/64 mA drive capability, and operates across −40°C to +85°C with 2.7–3.6 V supply. It is used in mixed-voltage motherboard interconnects and memory expansion interfaces.
For engineers reviewing the 74LVTH245 datasheet, pinout, applications, or equivalent options, key selection criteria include bushold input support, 3-STATE bidirectional control timing (tPLH ≤ 3.6 ns), output drive strength (IOL = 64 mA), and SOIC-20 package compatibility with JEDEC MS-013 footprint.
Technical Context
The 74LVTH245 implements an octal non-inverting bidirectional buffer architecture controlled by two logic inputs: OE (active-HIGH disable) and T/R (active-HIGH transmit A→B, active-LOW receive B→A). Its bushold circuitry actively maintains last-valid logic state on unused data pins without external biasing.
It uses advanced BiCMOS fabrication to achieve ABT-class speed (propagation delay ≤ 4.0 ns at 2.7 V) while maintaining low static power (ICCZ = 0.19 mA) and robust bus isolation (3-STATE leakage ≤ ±5 µA). Input voltage tolerance extends to 5.5 V, enabling direct TTL-level interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports stable operation in 3.3V systems with ±0.3V margin |
| IOH / IOL | −32 mA / +64 mA - drives heavy capacitive loads and multiple TTL inputs without buffering |
| tPLH / tPHL | ≤ 4.0 ns at VCC = 2.7 V - ensures sub-5ns timing compliance in high-speed address/data buses |
| VIH / VIL | 2.0 V / 0.8 V - compatible with both LVTTL and 5V CMOS logic thresholds |
| II(HOLD) | ±75 µA at VI = 0.8V/2.0V - defines minimum external drive needed to override bushold state |
| IOZL / IOZH | −5 µA / +5 µA - guarantees minimal leakage during 3-STATE, preserving bus integrity |
| Operating Temp | −40°C to +85°C - qualified for industrial-grade embedded and computing applications |
Pinout & Package
74LVTH245SJX is supplied in a 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3 mm wide (Package Number M20D), with standard 0.65 mm lead pitch and gull-wing terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable Input | Active-HIGH global disable: places all A and B ports in HIGH-Z when asserted |
| 2 (A0) | Side A Data Terminal | Bidirectional I/O: functions as input (B→A) or output (A→B) depending on T/R state |
| 3 (A1) | Side A Data Terminal | Same behavior as A0; all A0–A7 share identical bushold and 3-STATE characteristics |
| 19 (B7) | Side B Data Terminal | Bidirectional I/O: mirrors A7 functionality with full 5.5V-tolerant input capability |
| 20 (T/R) | Transmit/Receive Control | Active-HIGH enables A→B flow; active-LOW enables B→A flow - determines data directionality |
Key Features
| Feature | Design Value |
|---|---|
| Bushold Inputs | Eliminates need for 20+ external pull-up resistors on A/B data lines, reducing BOM count and board space |
| Mixed-Voltage Interface | 5.5V-tolerant inputs allow direct connection to 5V buses while powered from 3.3V VCC |
| Live Insertion Support | Power-up/down high-impedance behavior prevents bus glitches during hot-plug operations |
| High Drive Strength | 64 mA sink capability enables driving 20+ TTL loads or long PCB traces without signal degradation |
| Latch-up Immunity | Exceeds 500 mA per JEDEC JESD78, ensuring robustness in noisy industrial environments |
Applications
| PCI Bus Bridge Interface | Memory Expansion Module |
|---|---|
Use Scenario: Interfacing a 3.3V PCI controller to legacy 5V peripheral cards via shared address/data bus. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing direction-controlled data flow under PCI protocol timing constraints. Use Value: Bushold inputs prevent floating states during configuration cycles; 4 ns propagation delay meets PCI 2.2 setup/hold margins. | Use Scenario: Adding SRAM or Flash memory to a 3.3V microcontroller system with 5V-compatible address latching. IC Role / Device Role / Timing Role: Octal bidirectional data path controller enabling read/write access between MCU data bus and memory DQ lines. Use Value: 64 mA sink current drives memory data bus capacitance; 3-STATE isolation prevents contention during memory refresh. |
| Industrial Backplane Interconnect | Embedded CPU Daughterboard |
Use Scenario: Connecting modular I/O modules to a central 3.3V processor backplane operating alongside 5V sensor interfaces. IC Role / Device Role / Timing Role: Voltage-agile bus transceiver providing direction-controlled data routing across mixed-supply slots. Use Value: −40°C to +85°C rating ensures reliability in uncontrolled enclosures; 500 mA latch-up immunity withstands field ESD events. | Use Scenario: Enabling hot-swappable CPU daughterboards with independent 3.3V/5V domain separation. IC Role / Device Role / Timing Role: Controlled-direction data coupler isolating host bus from daughterboard during insertion/removal. Use Value: Power-up high-impedance prevents bus contention; bushold holds valid state on unconnected pins pre-initialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | No bushold; 1.65–3.6 V VCC range; lower drive (24 mA sink); 3.3V-only I/O tolerance | Suitable only in fully 3.3V systems without 5V interface needs | Select when bushold is unnecessary and cost sensitivity outweighs mixed-voltage flexibility |
| 74ALVC16245PAG | 16-bit (dual-octal); no bushold; 1.65–3.6 V; 24 mA drive; TSSOP-48 package | Used in wider data buses (e.g., 16-bit memory subsystems); requires larger PCB area | Choose for higher channel count where space allows and bushold is not required |
Compared with SN74LVC245APWR and 74ALVC16245PAG, the 74LVTH245 provides unique bushold-enabled plug-and-play operation in mixed-voltage environments, higher drive strength for legacy load driving, and proven industrial temperature reliability - making it optimal for upgrade paths from 5V systems.
Availability
74LVTH245SJX is available at Aetrix Electronics and suitable for industrial backplanes, memory expansion modules, and PCI bridge interfaces requiring stable component supply, long-term lifecycle support, and consistent SOIC-20 (M20D) packaging.
Supply support for 74LVTH245SJX 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 U.S.-based analog and power IC manufacturer acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.
The 74LVTH245 belongs to Fairchild's Low-Voltage Transceiver family, engineered specifically for seamless interoperability between emerging 3.3V logic domains and existing 5V systems without level-shifters or external biasing.
FAQ
What is the function of the T/R pin on the 74LVTH245SJX?
The T/R (Transmit/Receive) pin controls data direction: when HIGH, data flows from A-side to B-side; when LOW, data flows from B-side to A-side. This bidirectional control is essential for shared-bus architectures like PCI or memory data paths. The 74LVTH245SJX uses active-LOW receive logic, meaning the T/R pin must be pulled low to enable B→A communication. Its threshold is defined by VIH = 2.0 V and VIL = 0.8 V at 3.3 V VCC.
Does the 74LVTH245SJX require external pull-up resistors on its data pins?
No, the 74LVTH245SJX includes integrated bushold circuitry on all data inputs (A0–A7 and B0–B7), which actively retains the last valid logic state without external components. This eliminates the need for up to 16 pull-up resistors in typical implementations. The bushold feature is confirmed in the datasheet's "Features" section and validated by II(HOLD) = ±75 µA specifications at 3.0 V.
What is the maximum output drive capability of the 74LVTH245SJX?
The 74LVTH245SJX delivers ±32 mA high-level and +64 mA low-level output current per pin, verified under IOL = 64 mA and IOH = −32 mA conditions. This drive strength supports direct interfacing with multiple TTL loads or long PCB traces. The specification appears in the DC Electrical Characteristics table under "IOH" and "IOL", with test conditions explicitly stated for VCC = 2.7–3.6 V and TA = −40°C to +85°C.
Can the 74LVTH245SJX operate with a 5V supply voltage?
No, the 74LVTH245SJX is rated for VCC = 2.7 V to 3.6 V only; applying 5V to VCC exceeds its Absolute Maximum Rating of +4.6 V and will cause permanent damage. However, its inputs tolerate up to 5.5 V, allowing safe connection to 5V signal sources while powered from 3.3V. This distinction is clearly documented in the "Absolute Maximum Ratings" and "Recommended Operating Conditions" tables.
What package type is used for the 74LVTH245SJX?
The 74LVTH245SJX uses a 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3 mm wide, with Package Number M20D. This is distinct from the SOIC-20 (M20B) variant and features gull-wing leads with 0.65 mm pitch. The package dimensions and mechanical drawing are provided on page 5 of the original Fairchild datasheet DS500203.
74LVTH245SJX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVTH
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- 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
74LVTH245SJX FAQ
1.How can I place an order for 74LVTH245SJX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVTH245SJX 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 74LVTH245SJX reliable?
The price and inventory of 74LVTH245SJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVTH245SJX is usually 5 days.
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74LVTH245SJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVTH245SJX 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 74LVTH245SJX?
For technical support, including 74LVTH245SJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVTH245SJX requirements.
6.How does Aetrix verify that 74LVTH245SJX is sourced from the original manufacturer or authorized distributors?
All 74LVTH245SJX 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 74LVTH245SJX meets industry standards.
7.What is the process for return or replacement of 74LVTH245SJX?
All 74LVTH245SJX units undergo pre-shipment inspection (PSI). If there is an issue with 74LVTH245SJX, 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 74LVTH245SJX part is unused and in its original packaging.
Return procedure for 74LVTH245SJX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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