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NXP Semiconductors 74LVCH245ABX,115
- Part No.:
- 74LVCH245ABX,115
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-XFQFN Exposed Pad
- Datasheet:
-
74LVCH245ABX,115.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20DHXQFN
- Quantity:
- Payment:
- Shipping:
Inventory:76,000
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Product details
Overview
74LVCH245ABX,115 from Nexperia is an octal 3-state bus transceiver with bidirectional data flow controlled by DIR and active-low OE inputs. It operates from 1.2 V to 3.6 V, tolerates 5.5 V inputs, features bus hold on all data I/Os (A0–A7), and supports mixed-voltage translation between 3.3 V and 5 V systems in industrial control backplanes.
For engineers reviewing the 74LVCH245ABX,115 datasheet, 74LVCH245ABX,115 pinout, 74LVCH245ABX,115 application, or 74LVCH245ABX,115 equivalent, key selection criteria include IOFF-enabled partial power-down capability, Schmitt-trigger input hysteresis for slow-edge tolerance, bus hold functionality to eliminate external pull resistors, and guaranteed operation from –40 °C to +125 °C.
Technical Context
This device implements a dual-bus, direction-controlled transceiver architecture with independent A-side and B-side 8-bit data paths. Direction is set by DIR (HIGH = A→B, LOW = B→A), while OE (active LOW) enables/disables all outputs into high-impedance state. The IOFF circuit actively disables outputs during power-down to prevent backflow current.
All inputs feature Schmitt-trigger action with typical hysteresis of 0.3 V at VCC = 3.3 V, enabling robust operation with slow-rising/falling signals. Bus hold circuitry maintains last-valid logic state on A0–A7 when un-driven, eliminating need for external biasing - a feature exclusive to the LVCH variant and absent in standard LVC245A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage range | 1.2 V to 3.6 V - Enables direct interface with 1.2 V, 1.8 V, 2.5 V, and 3.3 V logic domains without level shifters. |
| Input voltage tolerance | Up to 5.5 V - Allows safe connection to 5 V peripherals in mixed-voltage systems without clamping diodes or external protection. |
| Propagation delay (VCC = 3.3 V) | Typ. 2.9 ns - Supports high-speed data transfer up to ~170 MHz clock-equivalent rates in synchronous bus applications. |
| Bus hold current (VI = 0.8 V, VCC = 3.0 V) | 75 μA - Actively sustains LOW state on floating A-side inputs, removing requirement for external pull-down resistors. |
| IOFF leakage (VCC = 0 V) | ±10 μA max - Limits backflow current during hot-insertion or partial power-down, protecting upstream drivers and downstream loads. |
| Operating temperature | –40 °C to +125 °C - Qualified for under-hood automotive modules, industrial PLC I/O cards, and telecom line-card environments. |
| ESD rating (HBM) | >2000 V - Meets JEDEC JS-001 Class 2, reducing susceptibility to handling damage in manufacturing and field repair. |
Pinout & Package
DHVQFN20 package (SOT764-1): 2.5 mm × 4.5 mm × 0.85 mm body, 20-terminal leadless quad flat no-lead (QFN) with exposed thermal pad; pin 1 index area marked on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | HIGH enables A→B data flow; LOW enables B→A - determines signal path direction for all 8 channels simultaneously. |
| 2–9 (A0–A7) | A-side bidirectional I/O | Data terminals with bus hold and Schmitt-trigger inputs - retain last logic state when floating; tolerate slow edges. |
| 10 (GND) | Ground reference | 0 V return path for all internal circuitry and I/O; must be low-impedance for noise immunity and timing integrity. |
| 11–18 (B7–B0) | B-side bidirectional I/O | Complementary 8-bit bus port; electrically identical to A-side but lacks bus hold - requires external termination if un-driven. |
| 19 (OE) | Output enable (active LOW) | Drives all A/B outputs to high-impedance when HIGH; enables bus sharing across multiple transceivers on same lines. |
| 20 (VCC) | Power supply | Primary supply rail (1.2–3.6 V); decoupling capacitor required within 5 mm for stable switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| Bus hold on A-side I/Os | Maintains valid logic state on A0–A7 without external pull resistors - reduces BOM count and PCB area in space-constrained designs. |
| IOFF partial power-down | Disables output drivers and blocks current flow when VCC = 0 V - essential for hot-swap backplane and modular system architectures. |
| Schmitt-trigger inputs | Input hysteresis ≥0.3 V at 3.3 V - rejects noise and accommodates slow rise/fall times from microcontrollers or legacy peripherals. |
| 5.5 V overvoltage tolerant inputs | Accepts 5 V signals while powered from 1.8 V or 2.5 V - eliminates discrete level translators in mixed-supply FPGA or MCU interfaces. |
| JEDEC-compliant voltage ranges | Fully compliant with JESD8-7A (1.65–1.95 V), JESD8-5A (2.3–2.7 V), and JESD8-C/JESD36 (2.7–3.6 V) - ensures interoperability across industry-standard logic families. |
Applications
| Industrial Backplane Interface | Microcontroller GPIO Expansion |
|---|---|
|
Use Scenario: Connecting a 3.3 V ARM Cortex-M7 MCU to legacy 5 V sensor nodes and actuator drivers via shared parallel bus. IC Role / Device Role / Timing Role: Bidirectional voltage translator and bus isolator - DIR selects direction per transaction; OE gates access during arbitration. Use Value: Eliminates four discrete level shifters and eight pull-up resistors; reduces layout complexity and improves signal integrity at 25 MHz bus rates. |
Use Scenario: Expanding GPIO count of a low-power RISC-V SoC operating at 1.8 V to drive 8-bit LED displays and keypad scanners requiring 3.3 V logic levels. IC Role / Device Role / Timing Role: Level-shifting I/O expander with bus hold - retains display segment states during SoC sleep mode without external latches. Use Value: Enables zero-power retention of display data during deep-sleep cycles; cuts standby current by 12 μA versus resistor-based hold solutions. |
| Automotive Body Control Module | Test Equipment Digital I/O Card |
|
Use Scenario: Interfacing a 3.3 V CAN controller MCU to 5 V LIN transceivers and door-lock actuators in a BCM subassembly. IC Role / Device Role / Timing Role: Fault-tolerant bus buffer with IOFF - isolates MCU during battery brownout events to prevent backfeed into powered-down domains. Use Value: Meets ISO 16750-2 load dump immunity requirements via IOFF shutdown; avoids latch-up risk during 12 V transients. |
Use Scenario: Building a reconfigurable digital stimulus/response card for ATE systems supporting both 1.8 V and 5 V DUTs on shared test fixtures. IC Role / Device Role / Timing Role: Programmable voltage-domain bridge - DIR and OE controlled by FPGA to route patterns bidirectionally across voltage islands. Use Value: Reduces fixture changeover time by 70% versus fixed-voltage interface cards; supports 100+ DUT variants with single hardware design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC245ABQ,115 | Lacks bus hold on A-side I/Os; otherwise identical pinout, timing, and voltage specs. | Requires external pull resistors on A-side when un-driven; unsuitable for floating-bus or low-power retention use cases. | Select when cost sensitivity outweighs bus hold benefit and external termination is acceptable. |
| SN74LVC8T245RHLR | TI part in 20-pin VQFN (same footprint); includes auto-direction sensing (no DIR pin) but no bus hold. | Reduces control pin count but increases firmware complexity for direction detection; not drop-in compatible due to DIR pin absence. | Choose only when direction logic can be offloaded to software and board redesign is feasible. |
Compared with 74LVCH245ABX,115, the 74LVC245ABQ,115 saves cost but forfeits bus hold - increasing BOM and layout effort - while SN74LVC8T245RHLR trades pin count for direction autonomy, requiring firmware adaptation and PCB revision.
Availability
74LVCH245ABX,115 is available at Aetrix Electronics and suitable for industrial backplanes, automotive body control modules, test equipment I/O cards, and microcontroller GPIO expansion requiring stable component supply across extended temperature and mixed-voltage conditions.
Supply support for 74LVCH245ABX,115 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
Nexperia is a global semiconductor expert delivering high-performance, reliable, and energy-efficient components for automotive, industrial, mobile, and computing applications.
The 74LVCH245A belongs to Nexperia's advanced logic portfolio, engineered specifically for robust mixed-voltage interfacing in harsh-environment systems where bus stability, power-down safety, and signal integrity are critical.
FAQ
What is the function of the DIR pin on the 74LVCH245ABX,115?
The DIR (direction) pin controls data flow direction: when HIGH, data passes from A-side inputs (A0–A7) to B-side outputs (B0–B7); when LOW, data flows from B-side to A-side. It is asynchronous and does not require clocking - direction changes take effect after propagation delay (e.g., 2.9 ns at 3.3 V).
Does the 74LVCH245ABX,115 support true 5 V operation?
No - VCC must remain within 1.2 V to 3.6 V. However, its inputs tolerate up to 5.5 V regardless of VCC level, enabling safe connection to 5 V sources while powered from lower voltages like 1.8 V or 2.5 V. Outputs swing rail-to-rail between GND and VCC, not 5 V.
How does bus hold work, and which pins support it?
Bus hold actively maintains the last-valid logic state on A0–A7 inputs using weak feedback transistors. It is disabled when input voltage exceeds VCC, allowing 5.5 V signals to pass through. B-side pins (B0–B7) and control pins (DIR, OE) do not have bus hold - only the A-side data I/Os.
Can the 74LVCH245ABX,115 be used in hot-swap applications?
Yes - its IOFF circuitry disables outputs and limits leakage to ±10 μA when VCC = 0 V, preventing damaging backflow current during live insertion/removal. This makes it suitable for modular backplanes and field-replaceable units where power sequencing cannot be guaranteed.
74LVCH245ABX,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74LVCH
- Package/Case:
- 20-XFQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-DHXQFN (4.5x2.5)
74LVCH245ABX,115 FAQ
1.How can I place an order for 74LVCH245ABX,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVCH245ABX,115 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 74LVCH245ABX,115 reliable?
The price and inventory of 74LVCH245ABX,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVCH245ABX,115 is usually 5 days.
3.What payment methods are accepted for 74LVCH245ABX,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVCH245ABX,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVCH245ABX,115?
74LVCH245ABX,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVCH245ABX,115 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 74LVCH245ABX,115?
For technical support, including 74LVCH245ABX,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVCH245ABX,115 requirements.
6.How does Aetrix verify that 74LVCH245ABX,115 is sourced from the original manufacturer or authorized distributors?
All 74LVCH245ABX,115 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 74LVCH245ABX,115 meets industry standards.
7.What is the process for return or replacement of 74LVCH245ABX,115?
All 74LVCH245ABX,115 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVCH245ABX,115, 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 74LVCH245ABX,115 part is unused and in its original packaging.
Return procedure for 74LVCH245ABX,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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