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NXP Semiconductors 74LVC245ABX,115
- Part No.:
- 74LVC245ABX,115
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-XFQFN Exposed Pad
- Datasheet:
-
74LVC245ABX,115.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20DHXQFN
- Quantity:
- Payment:
- Shipping:
Inventory:48,000
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Product details
Overview
74LVC245ABX,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 Schmitt-trigger inputs for noise immunity, and includes IOFF circuitry for partial power-down protection. It enables level translation between 3.3 V and 5 V domains in embedded control buses.
For engineers reviewing the 74LVC245ABX,115 datasheet, 74LVC245ABX,115 pinout, 74LVC245ABX,115 application, or 74LVC245ABX,115 equivalent, key selection criteria include voltage translation capability (1.2–3.6 V supply with 5.5 V-tolerant inputs), propagation delay (≤8.0 ns at 3.3 V), bus hold functionality (in LVCH variant), thermal performance in DHXQFN20 package, and IOFF compliance for hot-swap and power-gating designs.
Technical Context
This device implements a dual-bus interface architecture where DIR selects data direction (A→B or B→A) and OE enables/disables all outputs simultaneously into high-impedance state. Its CMOS design ensures low static current (≤40 μA at 3.6 V) and supports mixed-voltage system interconnects without external level shifters.
Schmitt-trigger inputs provide hysteresis (typ. 0.3–0.5 V) to suppress noise on slow-rising signals, while the IOFF circuit actively disables outputs when VCC = 0 V, blocking backflow current up to ±20 μA - critical for PCIe add-in cards, hot-pluggable modules, and battery-backed subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.2 V to 3.6 V - enables operation across core logic rails including 1.8 V microcontrollers and 3.3 V peripherals |
| Input Voltage Range | 0 V to 5.5 V - allows direct connection to 5 V TTL outputs without clamping diodes or external resistors |
| Propagation Delay | ≤8.0 ns at VCC = 3.3 V - supports ≥100 MHz bus toggle rates in synchronous data transfers |
| IOFF Leakage | ±20 μA max at VCC = 0 V - prevents damaging back-current during partial power-down sequences |
| ESD Rating | HBM >2000 V, CDM >1000 V - meets industrial IEC 61000-4-2 immunity requirements without added protection circuitry |
| Operating Temp | −40 °C to +125 °C - qualified for under-hood automotive ECUs and industrial motor drives |
| Output Drive | ±24 mA at VCC = 3.0 V - drives 15 pF loads over 10 cm PCB traces with <10% overshoot |
Pinout & Package
DHXQFN20 (SOT8020-1) package: 2.0 mm × 3.2 mm × 0.48 mm body, 0.4 mm pitch, 20-terminal leadless construction with exposed thermal pad (GND-connected per datasheet recommendation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A0) | Data I/O port A | Low-order bidirectional data line tied to microcontroller GPIO bank A |
| 2 (GND) | Ground reference | Primary return path for all I/O and supply currents; must be connected to PCB ground plane |
| 3 (A1) | Data I/O port A | Second bit of 8-bit parallel bus; routed with matched length to other A-lines |
| 4 (A2) | Data I/O port A | Third bit of A-side bus; shares same timing budget as A0–A7 for setup/hold compliance |
| 5 (A3) | Data I/O port A | Fourth bit of A-side bus; used in address/data multiplexing schemes with OE/DIR coordination |
| 6 (A4) | Data I/O port A | Fifth bit of A-side bus; supports byte-wide memory-mapped peripheral access |
| 7 (A5) | Data I/O port A | Sixth bit of A-side bus; synchronized with DIR edge for glitch-free direction switching |
| 8 (A6) | Data I/O port A | Seventh bit of A-side bus; referenced in timing analysis for worst-case tpd skew |
| 9 (A7) | Data I/O port A | High-order bit of A-side bus; critical for MSB-aligned data transfers in SPI-to-parallel bridges |
| 10 (OE) | Active-low output enable | Asserted LOW enables A↔B data flow; HIGH forces all outputs to high-Z - used for bus arbitration |
| 11 (B7) | Data I/O port B | High-order bit of B-side bus; connects to FPGA I/O bank or ASIC data interface |
| 12 (B6) | Data I/O port B | Seventh bit of B-side bus; routed with controlled impedance for EMI-sensitive applications |
| 13 (B5) | Data I/O port B | Sixth bit of B-side bus; shares common termination network with B0–B7 for signal integrity |
| 14 (B4) | Data I/O port B | Fifth bit of B-side bus; timed relative to DIR transition for minimum bus turnaround latency |
| 15 (B3) | Data I/O port B | Fourth bit of B-side bus; used in legacy ISA-style expansion interfaces requiring direction control |
| 16 (B2) | Data I/O port B | Third bit of B-side bus; validated for 50 Ω source-terminated drive into 30 pF loads |
| 17 (B1) | Data I/O port B | Second bit of B-side bus; supports hot-swap detection via IOFF-enabled isolation |
| 18 (B0) | Data I/O port B | Low-order bit of B-side bus; paired with A0 for LSB-aligned data exchange |
| 19 (DIR) | Direction control input | HIGH routes A→B; LOW routes B→A - synchronized with OE to avoid bus contention |
| 20 (VCC) | Positive supply rail | Must be decoupled with 100 nF ceramic capacitor within 3 mm of pin; supports 100 mA peak current |
Key Features
| Feature | Design Value |
|---|---|
| Overvoltage-tolerant inputs | Withstands 5.5 V inputs while powered from 1.2 V - eliminates need for external level translators in mixed-voltage systems |
| IOFF partial power-down | Blocks backflow current when VCC = 0 V - enables safe insertion/removal in live-backplane applications |
| Schmitt-trigger inputs | Provides 300–500 mV hysteresis - rejects noise on long traces or unshielded cables in industrial PLC I/O modules |
| JEDEC-compliant voltage ranges | Validated across 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 with DDR memory controllers and FPGA I/O banks |
| Thermal-enhanced DHXQFN20 | 0.48 mm profile with exposed thermal pad - achieves 111 °C/W junction-to-board thermal resistance for compact fanless enclosures |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Interfacing 3.3 V MCU to legacy 5 V sensor bus in programmable logic controller rack. IC Role / Device Role / Timing Role: Bidirectional level translator and bus isolator; DIR toggled per command cycle, OE asserted during configuration writes. Use Value: Eliminates discrete resistor-divider networks and reduces BOM count by 8 components per channel while maintaining <2 ns timing skew across all 8 lines. | Use Scenario: Connecting infotainment SoC (1.8 V I/O) to door module MCU (3.3 V) via CAN-linked diagnostic bus. IC Role / Device Role / Timing Role: Voltage-level adapter and bus contention guard; OE synchronized to CAN frame start, DIR set for firmware update payload direction. Use Value: Enables reliable 1 Mbps data bursts with <10 ns inter-channel skew, meeting ISO 11898-2 timing margins for Class B diagnostics. |
| Medical Imaging Data Acquisition Card | Test Equipment Digital Pattern Generator |
Use Scenario: Buffering parallel ADC output (5 V) to FPGA capture engine (2.5 V) in ultrasound beamformer board. IC Role / Device Role / Timing Role: High-speed data conduit with precise timing alignment; DIR fixed for ADC→FPGA flow, OE gated by sample clock edge. Use Value: Delivers sub-8 ns propagation delay consistency across all 8 bits - preserves 12-bit ENOB integrity at 20 MSPS sampling rates. | Use Scenario: Driving 8-bit stimulus patterns from pattern generator ASIC (3.3 V) to DUT with 5 V TTL logic inputs. IC Role / Device Role / Timing Role: Output driver and voltage translator; OE pulsed per vector, DIR held constant for unidirectional test mode. Use Value: Sustains 100 MHz pattern rate with <50 ps output skew - meets JEDEC JESD68 AC timing compliance for ATE pin electronics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | TSSOP20 package (4.4 mm width); no bus hold; identical electrical specs except IBHL/IBHH = 0 | Lacks bus hold - requires external pull-ups in floating-bus scenarios; better suited for space-constrained PCBs with full routing control | Select when footprint size is prioritized over input state retention during reset or sleep states |
| 74LVCH245ABQ | DHVQFN20 package (2.5 × 4.5 mm); includes bus hold on all data inputs (IBHL/IBHH specified); same IOFF and voltage specs | Bus hold eliminates need for external biasing on unused inputs - ideal for modular systems with configurable I/O pin mapping | Select when input state retention during power sequencing or partial wake-up is required |
Compared with SN74LVC245APWR, 74LVC245ABX,115 offers superior thermal performance (lower θJA) in ultra-thin form factor but lacks bus hold; versus 74LVCH245ABQ, it trades slightly larger thermal pad area for tighter 2.0 mm width - favoring ultra-dense portable instrumentation layouts.
Availability
74LVC245ABX,115 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive BCMs, medical imaging acquisition cards, and automated test equipment requiring stable component supply across extended temperature and mixed-voltage environments.
Supply support for 74LVC245ABX,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 focused on essential efficiency technologies, delivering high-performance logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74LVC/LVCH series targets robust, low-power digital interfacing in space- and power-constrained systems - designed specifically for voltage translation, bus isolation, and hot-swap compatibility in mission-critical embedded platforms.
FAQ
Can 74LVC245ABX,115 operate with VCC = 1.2 V while accepting 5 V inputs?
Yes. The device supports 1.2 V to 3.6 V supply range and features overvoltage-tolerant inputs rated to 5.5 V regardless of VCC level. This allows direct connection to 5 V TTL sources even when powered from a 1.2 V rail - verified per Table 5 and Table 6 in the datasheet under VI = 0–5.5 V conditions.
What is the function of the exposed thermal pad on the DHXQFN20 package?
The exposed pad (terminal 1 index area) is electrically connected to GND and must be soldered to a PCB thermal pad tied to the ground plane. Per SOT8020-1 mechanical drawing, this improves thermal dissipation (reducing θJA by ~35%) and enhances mechanical reliability - not optional for continuous 24 mA per pin operation at +125 °C.
How does IOFF protect the device during partial power-down?
When VCC = 0 V, the IOFF circuit disables all outputs and limits leakage current to ±20 μA maximum (Table 6), preventing reverse current flow from live B-side buses into the unpowered A-side domain. This avoids latch-up and damage in hot-swap or multi-rail power sequencing scenarios - confirmed by test condition "VI or VO = 5.5 V; VCC = 0.0 V".
Is bus hold functionality present in 74LVC245ABX,115?
No. Bus hold (IBHL/IBHH) is exclusive to the 74LVCH245A variant. The 74LVC245A family - including 74LVC245ABX,115 - omits this feature. Input pins default to high-impedance when undriven; external pull-up/down resistors are required to maintain defined logic states during reset or standby.
74LVC245ABX,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74LVC
- 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)
74LVC245ABX,115 FAQ
1.How can I place an order for 74LVC245ABX,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVC245ABX,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 74LVC245ABX,115 reliable?
The price and inventory of 74LVC245ABX,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVC245ABX,115 is usually 5 days.
3.What payment methods are accepted for 74LVC245ABX,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVC245ABX,115 transactions.
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4.How is shipping managed for 74LVC245ABX,115?
74LVC245ABX,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVC245ABX,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 74LVC245ABX,115?
For technical support, including 74LVC245ABX,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVC245ABX,115 requirements.
6.How does Aetrix verify that 74LVC245ABX,115 is sourced from the original manufacturer or authorized distributors?
All 74LVC245ABX,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 74LVC245ABX,115 meets industry standards.
7.What is the process for return or replacement of 74LVC245ABX,115?
All 74LVC245ABX,115 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVC245ABX,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 74LVC245ABX,115 part is unused and in its original packaging.
Return procedure for 74LVC245ABX,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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