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onsemi 74VHC245SJX
- Part No.:
- 74VHC245SJX
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74VHC245SJX.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,344
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Product details
Overview
74VHC245SJX from ON Semiconductor is an octal bidirectional bus transceiver with 3-STATE outputs, designed for asynchronous data exchange between two 8-bit buses. It operates at 2.0–5.5 V, delivers 4.0 ns typical propagation delay at 5 V, supports 8 mA output drive, and features independent transmit/receive (T/R) and output enable (OE) controls. It is used in microcontroller peripheral interfacing and legacy bus isolation.
For engineers reviewing the 74VHC245SJX datasheet, pinout, applications, or equivalent options, key selection considerations include bidirectional data flow control, 3-STATE bus isolation timing (tPZL/tPLZ ≤ 18 ns), DC input voltage tolerance (0–5.5 V), and compatibility with 74HC245 logic families.
Technical Context
The 74VHC245SJX implements a dual-bus architecture with separate A-side (A0–A7) and B-side (B0–B7) I/O terminals, where direction is controlled by the T/R input and output state by OE. All inputs include ESD protection and power-down immunity, enabling safe hot-insertion in powered systems.
It uses silicon-gate CMOS technology to achieve TTL-compatible speed (4.0 ns tPD typ at 5 V) while maintaining low ICC (4 µA max at 25 °C). The device meets JEDEC J-STD-020B for Pb-free reflow and supports 15 pF/50 pF load conditions across its AC timing specifications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.0–5.5 V - Enables direct interface with 3.3 V and 5 V logic domains without level shifters. |
| Propagation Delay | 4.0 ns (typ) at VCC = 5 V - Supports high-speed bus handshaking up to ~100 MHz system clock edges. |
| Output Drive | ±8 mA - Sufficient to drive standard CMOS/TTL loads across 20-cm PCB traces with <10% signal degradation. |
| Input Voltage Thresholds | VIH = 0.7×VCC, VIL = 0.3×VCC - Ensures robust noise margin (>28% VCC) in electrically noisy industrial environments. |
| Off-State Leakage | ±2.5 µA max - Maintains bus integrity during 3-STATE isolation, preventing unintended current paths in multi-drop systems. |
| Operating Temperature | −40 °C to +85 °C - Qualified for industrial-grade embedded control and instrumentation applications. |
| Power Dissipation | ICC ≤ 4 µA (max) at 25 °C - Enables ultra-low static power in battery-backed or always-on subsystems. |
Pinout & Package
Pb-Free 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3 mm wide (Package Number M20D).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable Input | Active-low global control: drives all A/B outputs to HIGH-Z when high; enables bidirectional flow when low. |
| 2 (A0) | Side A I/O Terminal | Configurable as input or 3-STATE output depending on T/R and OE states; connects to local bus segment. |
| 3 (A1) | Side A I/O Terminal | Same electrical behavior as A0; part of 8-bit parallel A-side interface with matched timing characteristics. |
| 19 (B7) | Side B I/O Terminal | Highest-order B-side terminal; supports full 8-bit data transfer in either direction with <1.5 ns inter-output skew. |
| 20 (T/R) | Transmit/Receive Control | High = A→B data flow; Low = B→A data flow; sampled synchronously with OE to avoid bus contention. |
Key Features
| Feature | Design Value |
|---|---|
| Pin- and function-compatible with 74HC245 | Enables drop-in replacement in existing HC-based designs without layout or firmware changes. |
| High noise immunity (28% VCC min) | Reduces susceptibility to EFT and radiated emissions in motor-drive or switching-power supply adjacent layouts. |
| Low dynamic noise (VOLP = 0.9 V typ) | Minimizes ground bounce and crosstalk in dense 8-bit bus routing on multilayer PCBs. |
| Power-down input protection | Prevents latch-up or damage when A/B pins are driven while VCC is unpowered or ramping. |
| JEDEC-compliant Pb-free packaging | Meets RoHS and REACH requirements for industrial and automotive-tier supply chain compliance. |
Applications
| Industrial PLC Backplane Interface | Legacy Microcontroller Peripheral Expansion |
|---|---|
Use Scenario: Isolating CPU address/data bus from modular I/O cards in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing 8-bit parallel data flow between main controller and field I/O modules. Use Value: Enables hot-swap capability via 3-STATE control and prevents bus contention during card insertion/removal. |
Use Scenario: Extending GPIO count of 8-bit MCUs (e.g., PIC16F, ATmega328) using parallel port expanders or memory-mapped peripherals. IC Role / Device Role / Timing Role: Level-shifting and direction-controlled data bridge between MCU port and external SRAM or LCD controller. Use Value: Delivers sub-5 ns propagation delay to maintain timing margins in 12–20 MHz MCU systems. |
| Test Equipment Digital Pattern Generator | Automotive Body Control Module Bus Isolation |
Use Scenario: Routing stimulus patterns between FPGA pattern generators and DUT interface connectors in automated test systems. IC Role / Device Role / Timing Role: Reconfigurable 8-bit data path element supporting both capture and drive modes under software control. Use Value: 3-STATE disable timing (tPZH ≤ 10 ns) ensures glitch-free bus release before next pattern cycle begins. |
Use Scenario: Separating LIN or CAN subsystem diagnostics bus from main MCU domain in body control units. IC Role / Device Role / Timing Role: Signal-direction arbitration and voltage-domain isolation between 5 V MCU and 12 V tolerant sensor interfaces. Use Value: Input voltage range (0–5.5 V) accommodates brown-out conditions while maintaining valid logic levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC245N | Same pinout and logic function; higher ICC (80 µA max), slower tPD (18 ns typ at 5 V) | Lower speed margin; unsuitable for >25 MHz bus handshaking | Select when cost sensitivity outweighs speed and power requirements. |
| SN74LVC245APWR | 3.3 V only (1.65–3.6 V), ±24 mA drive, 3.5 ns tPD, different pinout (TSSOP-20) | Not pin-compatible; requires PCB redesign but offers higher drive and lower voltage operation | Select for modern 3.3 V systems requiring enhanced drive strength and tighter timing budgets. |
Compared with 74HC245N and SN74LVC245APWR, the 74VHC245SJX uniquely balances 5 V compatibility, 4 ns speed, and 4 µA quiescent current-making it optimal for mixed-voltage industrial upgrades where layout reuse and low standby power are critical.
Availability
74VHC245SJX is available at Aetrix Electronics and suitable for industrial PLC backplanes, microcontroller peripheral expansion, and automotive body control module bus isolation requiring stable component supply and long-term lifecycle support.
Supply support for 74VHC245SJX 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, logic, and discrete devices for automotive, industrial, and cloud infrastructure markets.
The 74VHC245SJX belongs to ON Semiconductor's legacy logic portfolio, engineered for interoperability with industry-standard TTL/CMOS buses and targeted at industrial control, instrumentation, and legacy system modernization.
FAQ
What is the maximum operating voltage for the 74VHC245SJX?
The 74VHC245SJX supports a supply voltage range of 2.0 V to 5.5 V. Absolute maximum rating is 7.0 V, but sustained operation above 5.5 V violates recommended conditions and may cause parametric drift or reliability degradation. For reliable 5 V system integration, the 74VHC245SJX maintains full specification compliance across −40 °C to +85 °C.
Is the 74VHC245SJX pin-compatible with the 74HC245 family?
Yes, the 74VHC245SJX is pin- and function-compatible with the 74HC245 series, including identical pin numbering, terminal assignments, and truth table behavior. This allows direct PCB-level substitution without layout modification, provided voltage and timing margins align with the VHC family's improved speed and reduced power.
Does the 74VHC245SJX support hot-plug operation?
The 74VHC245SJX includes power-down protection on all inputs, allowing safe operation when inputs are driven while VCC is at 0 V or ramping. This feature supports hot-plug scenarios in modular backplanes, though external current limiting and sequencing remain necessary for full system-level hot-swap compliance.
What is the 3-STATE disable time for the 74VHC245SJX?
The 74VHC245SJX specifies tPHZ (disable time from HIGH to HIGH-Z) as 7.0–11.0 ns and tPLZ (disable time from LOW to HIGH-Z) as 7.0–11.0 ns at VCC = 5.0 V and CL = 50 pF. These values ensure rapid bus release to prevent contention during direction or enable transitions in synchronous bus protocols.
Can the 74VHC245SJX be used in 3.3 V systems?
Yes, the 74VHC245SJX operates down to 2.0 V and is fully specified at 3.3 V ±0.3 V. At 3.3 V, it delivers 5.8 ns typical propagation delay and maintains VIH/VIL thresholds at 0.7×VCC and 0.3×VCC respectively, ensuring interoperability with 3.3 V LVTTL and LVCMOS logic families without level translation.
74VHC245SJX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VHC
- 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:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOP
74VHC245SJX FAQ
1.How can I place an order for 74VHC245SJX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHC245SJX 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 74VHC245SJX reliable?
The price and inventory of 74VHC245SJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHC245SJX is usually 5 days.
3.What payment methods are accepted for 74VHC245SJX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHC245SJX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHC245SJX?
74VHC245SJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHC245SJX 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 74VHC245SJX?
For technical support, including 74VHC245SJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHC245SJX requirements.
6.How does Aetrix verify that 74VHC245SJX is sourced from the original manufacturer or authorized distributors?
All 74VHC245SJX 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 74VHC245SJX meets industry standards.
7.What is the process for return or replacement of 74VHC245SJX?
All 74VHC245SJX units undergo pre-shipment inspection (PSI). If there is an issue with 74VHC245SJX, 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 74VHC245SJX part is unused and in its original packaging.
Return procedure for 74VHC245SJX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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