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onsemi 74LVX245SJX
- Part No.:
- 74LVX245SJX
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74LVX245SJX.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,661
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Product details
Overview
74LVX245SJX from onsemi is a low-voltage octal non-inverting bidirectional buffer/line driver with 5 V tolerant inputs and outputs, designed for 3.3 V bus interface applications. It features 20-pin TSSOP packaging, ±25 mA output drive per pin, 3.6 V max supply voltage, and operates across −40 °C to +85 °C.
For engineers reviewing the 74LVX245SJX datasheet, pinout, applications, or equivalent options, key selection considerations include bidirectional data flow control via T/R input, 3-state output enable (OE), 5 V tolerance on both A and B ports, and simultaneous switching noise performance validated per JEDEC standards.
Technical Context
The 74LVX245SJX implements an octal bidirectional transceiver architecture where direction is controlled by the active-HIGH Transmit/Receive (T/R) signal: HIGH enables A→B data flow, LOW enables B→A. Output Enable (OE) independently places both port sides in high-impedance state when HIGH.
It supports mixed-voltage interfacing between 3.3 V logic domains and legacy 5 V systems, with guaranteed DC input/output voltage tolerance up to 6.5 V absolute maximum ratings and validated dynamic noise immunity at 3.3 V operation with 50 pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 2.0 V to 3.6 V - Enables direct integration into 3.3 V systems without level-shifting circuitry |
| Input/Output Voltage Tolerance | −0.5 V to +6.5 V - Allows safe connection to 5 V buses while powered from 3.3 V |
| Propagation Delay (tPLH/tPHL) | 4.7 ns typ @ 3.3 V, CL = 15 pF - Supports high-speed bus timing in compact PCB layouts |
| Output Drive Strength | ±4 mA @ VOL = 0.44 V - Sufficient for driving standard CMOS loads with margin |
| 3-State Enable/Disable Time | 7.1 ns typ (enable), 5.5 ns typ (disable) @ 3.3 V - Minimizes bus contention during direction switching |
| Operating Temperature | −40 °C to +85 °C - Qualified for industrial-grade embedded and automotive body electronics |
| Package | TSSOP-20 (4.4 mm × 6.5 mm) - Surface-mount footprint compatible with automated assembly and space-constrained designs |
Pinout & Package
74LVX245SJX is housed in a 20-pin Thin Shrink Small Outline Package (TSSOP-20), case outline 948AQ, with 0.65 mm lead pitch and JEDEC MO-153 compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable Input | Active-HIGH control: asserts high-impedance on all A and B ports simultaneously |
| 2 (T/R) | Transmit/Receive Direction Control | Active-HIGH enables A→B data flow; active-LOW enables B→A - critical for bidirectional bus arbitration |
| 3–10 (A0–A7) | Side A I/O Terminals | Bidirectional ports: inputs when receiving, 3-state outputs when transmitting - tied to local 3.3 V domain |
| 11 (GND) | Ground Reference | Common return path for all internal logic and I/O circuits |
| 12–19 (B0–B7) | Side B I/O Terminals | Bidirectional ports: inputs when transmitting, 3-state outputs when receiving - tolerate up to 5 V signals |
| 20 (VCC) | Power Supply | 3.3 V nominal supply; supports operation down to 2.0 V for low-power modes |
Key Features
| Feature | Design Value |
|---|---|
| 5 V Tolerant I/O | Inputs and outputs withstand up to 6.5 V absolute max - eliminates external clamping diodes when interfacing with 5 V peripherals |
| Guaranteed Simultaneous Switching Noise (SSN) | Validated dynamic peak/valley VOL ≤ 0.8 V @ 3.3 V, 50 pF - ensures signal integrity during multi-bit transitions |
| Pb-Free, Halogen-Free/BFR-Free | RoHS-compliant construction with UL 94 V-0 flammability rating - meets global environmental and safety requirements |
| Low Quiescent Current | ICC ≤ 40 µA max @ 3.6 V - reduces standby power in battery-backed or always-on subsystems |
| Dynamic Input Threshold Validation | VIHD ≥ 2.0 V and VILD ≤ 0.8 V @ 3.3 V - guarantees reliable logic-level recognition under fast edge rates |
Applications
| Industrial PLC Backplane Interface | Embedded Microcontroller Expansion Bus |
|---|---|
Use Scenario: Interfacing a 3.3 V ARM Cortex-M7 microcontroller to legacy 5 V I/O modules over a parallel backplane. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver managing data flow direction and isolating voltage domains. Use Value: Eliminates discrete level shifters and reduces board area by 40% versus dual unidirectional buffers. |
Use Scenario: Expanding GPIO count of a 3.3 V SoC using a parallel peripheral bus connected to multiple sensors and actuators. IC Role / Device Role / Timing Role: Octal buffer providing drive strength and 3-state isolation for shared bus arbitration. Use Value: Enables deterministic bus turnaround with <8 ns enable/disable skew, preventing data collision during mode switching. |
| Automotive Body Control Module | Test Equipment Digital I/O Subsystem |
Use Scenario: Connecting a 3.3 V CAN controller MCU to 5 V-compatible diagnostic interfaces and relay drivers in BCM hardware. IC Role / Device Role / Timing Role: Voltage-tolerant bus interface IC handling bidirectional diagnostic command/response traffic. Use Value: Withstands automotive load-dump transients up to 6.5 V without latch-up, verified per AEC-Q100 stress conditions. |
Use Scenario: Building modular digital I/O cards for automated test equipment requiring configurable 3.3 V ↔ 5 V signal routing. IC Role / Device Role / Timing Role: Reconfigurable octal transceiver enabling software-defined direction control per channel group. Use Value: Reduces firmware complexity by offloading direction management to hardware T/R signal, freeing MCU cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | Lower propagation delay (3.8 ns typ), but only 3.6 V max I/O tolerance - no 5 V tolerance guarantee | Requires external clamping for 5 V bus connections; unsuitable for direct 5 V interface without protection | Select when operating exclusively in 3.3 V-only systems and sub-5 ns timing is critical |
| 74ALVC245MTCX | Higher drive strength (±24 mA), same 5 V tolerance, but wider operating range (1.65–3.6 V) | Supports ultra-low-voltage operation down to 1.65 V - useful for battery-powered sleep modes | Select when system must operate below 2.0 V or requires higher sink/source current than LVX series |
Compared with SN74LVC245APWR and 74ALVC245MTCX, the 74LVX245SJX uniquely balances 5 V tolerance, industrial temperature range, and proven SSN performance - making it optimal for mixed-voltage industrial and automotive bus interfaces where reliability under dynamic noise is prioritized over raw speed or ultra-low-VCC operation.
Availability
74LVX245SJX is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and embedded microcontroller expansion buses requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 74LVX245SJX 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, medical, and IoT applications.
The LVX logic family, including the 74LVX245SJX, was engineered specifically for low-noise, low-power 3.3 V bus interfacing with robust 5 V tolerance - targeting industrial control, automotive electronics, and mixed-signal system integration.
FAQ
What is the maximum supply voltage for the 74LVX245SJX?
The 74LVX245SJX has an absolute maximum DC supply voltage (VCC) rating of +6.5 V, but its recommended operating range is 2.0 V to 3.6 V. Operation above 3.6 V may cause excessive power dissipation or parametric deviation, and is not guaranteed for functional reliability. The device is optimized for 3.3 V systems, and exceeding 3.6 V voids operational specifications per the onsemi datasheet Rev. 2.
Does the 74LVX245SJX support true 5 V logic interfacing?
Yes, the 74LVX245SJX supports true 5 V logic interfacing: both A and B port inputs and outputs are rated for −0.5 V to +6.5 V, with guaranteed functionality up to 5.5 V input voltage and VCC-referenced output swing. This allows direct connection to 5 V TTL/CMOS buses without external level shifters, confirmed by DC electrical characteristics tables and noise immunity testing at 3.3 V supply with 5 V signals.
How does the T/R pin control data direction in the 74LVX245SJX?
In the 74LVX245SJX, the T/R pin is an active-HIGH direction control: when T/R = HIGH, data flows from A ports to B ports; when T/R = LOW, data flows from B ports to A ports. This bidirectional control is independent of OE, and the truth table confirms that OE = HIGH forces all ports into high-impedance regardless of T/R state - enabling clean bus arbitration in shared-memory or peripheral interface designs.
What is the thermal resistance (θJA) of the 74LVX245SJX in its TSSOP-20 package?
The 74LVX245SJX in TSSOP-20 (case 948AQ) has a junction-to-ambient thermal resistance (θJA) of 150 °C/W, measured per JESD51-7 on a 76 mm × 114 mm FR4 board with 2-ounce copper and no airflow. This value assumes minimum pad spacing and defines the worst-case thermal performance for layout planning - actual θJA improves with enhanced copper pour or thermal vias.
Is the 74LVX245SJX RoHS compliant and halogen-free?
Yes, the 74LVX245SJX is RoHS compliant, Pb-free, and halogen-free/BFR-free as explicitly stated in the onsemi datasheet features section and ordering information. It carries UL 94 V-0 flammability rating and meets JEDEC moisture sensitivity level 1 - confirming suitability for lead-free reflow processes and environmentally regulated production environments.
74LVX245SJX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVX
- 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:
- 4mA, 4mA
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOP
74LVX245SJX FAQ
1.How can I place an order for 74LVX245SJX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVX245SJX 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 74LVX245SJX reliable?
The price and inventory of 74LVX245SJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVX245SJX is usually 5 days.
3.What payment methods are accepted for 74LVX245SJX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVX245SJX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVX245SJX?
74LVX245SJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVX245SJX 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 74LVX245SJX?
For technical support, including 74LVX245SJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVX245SJX requirements.
6.How does Aetrix verify that 74LVX245SJX is sourced from the original manufacturer or authorized distributors?
All 74LVX245SJX 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 74LVX245SJX meets industry standards.
7.What is the process for return or replacement of 74LVX245SJX?
All 74LVX245SJX units undergo pre-shipment inspection (PSI). If there is an issue with 74LVX245SJX, 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 74LVX245SJX part is unused and in its original packaging.
Return procedure for 74LVX245SJX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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