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Texas Instruments SN74LVC245ARGYR
- Part No.:
- SN74LVC245ARGYR
- Manufacturer:
- Texas Instruments
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
SN74LVC245ARGYR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,546
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Product details
Overview
SN74LVC245ARGYR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between 1.65-V to 3.6-V buses. It supports mixed-mode signal operation (5-V inputs with 3.3-V VCC), features Ioff for live insertion and partial-power-down protection, and delivers max tpd of 6.3 ns at 3.3 V - used in LED displays, network switches, and server I/O expansion.
For engineers reviewing the SN74LVC245ARGYR datasheet, SN74LVC245ARGYR pinout, SN74LVC245ARGYR application, or SN74LVC245ARGYR equivalent, key selection criteria include voltage translation capability (5 V ↔ 3.3 V), 20-pin VQFN package thermal performance, 3-state output control via DIR/OE, and Ioff-enabled back-drive protection in powered-down systems.
Technical Context
The SN74LVC245ARGYR implements dual-directional 8-bit data flow controlled by a single DIR input: high enables A→B transmission, low enables B→A. Output enable (OE) independently places all outputs in high-impedance state, isolating both buses. Its CMOS design ensures balanced drive strength and rail-to-rail input tolerance up to 5.5 V regardless of VCC level.
It operates across –40°C to +125°C with supply voltage from 1.65 V to 3.6 V, supporting legacy 5-V logic interfacing while maintaining compatibility with modern low-voltage microcontrollers and FPGAs. The device meets JESD 17 latch-up immunity (>250 mA) and exceeds JESD 22 ESD ratings (2000-V HBM, 1000-V CDM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - enables direct interface with 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 sources in mixed-voltage systems |
| Max Propagation Delay | 6.3 ns at VCC = 3.3 V - supports high-speed bus communication up to ~80 MHz clock-equivalent rates |
| Ioff Current | ±10 μA at VI/VO = 5.5 V - prevents damaging back-current during hot-swap or partial power-down |
| Output Drive Strength | ±24 mA at VCC = 3.0 V - drives moderate capacitive loads (e.g., 10–15 cm PCB traces) without external buffers |
| ESD Rating | 2000-V HBM - meets industrial handling requirements without special ESD precautions beyond standard protocols |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood, industrial control, and telecom infrastructure use |
Pinout & Package
VQFN-20 (RGY) package: 4.50 mm × 3.50 mm body, 0.5-mm pitch, wettable flank leads, exposed thermal pad. RoHS-compliant, MSL Level-2 (260°C, 1-year floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | High = A→B data flow; Low = B→A; determines signal path polarity for all 8 channels |
| 19 (OE) | Output enable input | Low = outputs active; High = all A/B pins enter high-impedance state, electrically isolating both buses |
| A1–A8 (Pins 2–9) | Transceiver I/O port A | Bidirectional data pins connected to one bus segment; tolerate 5.5-V inputs regardless of VCC |
| B1–B8 (Pins 11–18) | Transceiver I/O port B | Bidirectional data pins connected to second bus segment; functionally identical to A-side pins |
| 10 (GND) | Ground reference | Primary return path for all signals and power; must be low-impedance connection to system ground plane |
| 20 (VCC) | Power supply | Supplies core logic and output drivers; requires local 0.1-μF ceramic bypass capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-voltage interface | Accepts 5-V inputs while operating at 1.65–3.6-V VCC - eliminates need for discrete level translators in 3.3/5-V boundary applications |
| Ioff partial-power-down | Disables outputs and blocks current flow when VCC = 0 V - enables safe live insertion into powered-backplane systems |
| 3-state bus isolation | OE-controlled high-Z outputs prevent bus contention during multi-master arbitration or standby modes |
| Low ground bounce | Typical VOLP < 0.8 V at VCC = 3.3 V - reduces noise coupling into sensitive analog sections on shared PCBs |
| Robust ESD/latch-up | 2000-V HBM ESD rating and >250 mA latch-up immunity - suitable for manufacturing and field-replaceable modules |
Applications
| LED Display Driver Interface | Industrial Network Switch Backplane |
|---|---|
Use Scenario: Driving multiplexed 7-segment or dot-matrix LED panels from a 3.3-V microcontroller while sourcing sink current from 5-V LED supply rails. IC Role / Device Role / Timing Role: Bidirectional voltage translator and current-boosting buffer between MCU GPIO and LED column drivers. Use Value: Eliminates external MOSFETs or dedicated LED drivers by tolerating 5-V anode voltages and delivering ±24 mA per segment. | Use Scenario: Isolating CPU-side and PHY-side data buses in managed Ethernet switches during firmware updates or link renegotiation. IC Role / Device Role / Timing Role: Asynchronous bus transceiver enabling hot-swappable module communication without disrupting main control plane. Use Value: OE-controlled 3-state outputs prevent bus contention; Ioff protects PHYs during partial power cycling of management subsystems. |
| Server Baseboard Management Controller (BMC) I/O Expansion | Automotive Body Control Module (BCM) Signal Aggregation |
Use Scenario: Extending GPIO count of a BMC ASIC to monitor chassis sensors and control fans, LEDs, and reset lines across multiple voltage domains. IC Role / Device Role / Timing Role: Octal I/O expander with direction control, allowing flexible assignment of each channel as input or output based on runtime configuration. Use Value: DIR pin enables dynamic reconfiguration without hardware changes; 125°C rating supports operation near power supplies and VRMs. | Use Scenario: Aggregating LIN, CAN, and discrete switch inputs onto a central 3.3-V MCU in door modules or seat controllers where space and thermal constraints are critical. IC Role / Device Role / Timing Role: Voltage-level bridging transceiver connecting legacy 5-V sensor outputs and new low-voltage MCUs in compact VQFN packaging. Use Value: 4.5 mm × 3.5 mm VQFN footprint saves board area vs. SOIC/TSSOP; wettable flanks support automated optical inspection (AOI). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC245RHLR | Lower VCC range (1.2–3.6 V); higher speed (tpd = 3.2 ns @ 1.8 V); no 5-V tolerant inputs | Suitable only for pure low-voltage systems (<3.3 V); not usable where 5-V inputs exist | Select when maximum speed at 1.2–1.8 V is required and all connected logic is sub-3.3 V |
| 74LVC245ADTR2G | TSSOP-20 package; identical electrical specs; same 5-V tolerant inputs and Ioff support | Larger footprint (6.5 mm × 4.4 mm) and higher thermal resistance (RθJA = 83.6°C/W vs. 108.1°C/W for RGY) | Choose for legacy TSSOP assembly lines or when VQFN reflow capability is unavailable |
Compared with SN74AVC245RHLR, SN74LVC245ARGYR provides essential 5-V input tolerance for mixed-voltage designs; compared with 74LVC245ADTR2G, it offers superior thermal performance and 35% smaller PCB area in VQFN packaging - critical for space-constrained embedded systems.
Availability
SN74LVC245ARGYR is available at Aetrix Electronics and suitable for LED display interfaces, industrial network switch backplanes, and server BMC I/O expansion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVC245ARGYR 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with over 50 years of innovation in industrial, automotive, and communications markets.
The SN74LVC245A product line delivers robust, voltage-flexible bus interface ICs optimized for reliable data exchange between heterogeneous logic families in harsh environments - especially where mixed-voltage interoperability and power sequencing resilience are mandatory.
FAQ
What is the maximum input voltage the SN74LVC245ARGYR can tolerate on its A/B pins?
The SN74LVC245ARGYR accepts input voltages up to 5.5 V on all A and B I/O pins, independent of VCC level - enabling safe interfacing with 5-V logic even when operating at 1.65 V or 3.3 V. This overvoltage tolerance is explicitly specified in the Recommended Operating Conditions table and verified across –40°C to +125°C.
Does the SN74LVC245ARGYR support hot-plug or live-insertion applications?
Yes, the SN74LVC245ARGYR supports live insertion via its Ioff feature: when VCC = 0 V, the Ioff circuitry disables all outputs and limits off-state leakage to ±10 μA, preventing damaging back-current from powered buses into the unpowered device - a requirement confirmed in JESD 78 and validated in TI's characterization reports.
What is the thermal resistance (RθJA) of the SN74LVC245ARGYR in its VQFN package?
The SN74LVC245ARGYR in the RGY (VQFN-20) package has a junction-to-ambient thermal resistance (RθJA) of 108.1°C/W under standard JEDEC test conditions (JESD 51-5). This value assumes a 1-in² 2-oz copper pad with thermal vias - actual board-level performance improves with enhanced thermal land design.
Can the SN74LVC245ARGYR be used for unidirectional data transfer only?
Yes, the SN74LVC245ARGYR can operate unidirectionally by holding DIR constant (high for A→B, low for B→A) while using OE to enable/disable the path. Its functional table confirms deterministic behavior in both directions, and no internal asymmetry affects timing or drive strength - making it suitable for fixed-path applications like memory address/data bus extension.
Is the SN74LVC245ARGYR pin-compatible with other packages in the SN74LVC245A family?
No - the SN74LVC245ARGYR uses a 20-pin VQFN (RGY) package with different pinout than DB (SSOP), PW (TSSOP), or DW (SOIC) variants. While all share identical logic functionality and signal names, physical pin assignments differ significantly (e.g., DIR is Pin 1 in RGY but Pin 19 in DB), requiring separate PCB layouts for each package.
SN74LVC245ARGYR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VQFN (3.5x4.5)
SN74LVC245ARGYR FAQ
1.How can I place an order for SN74LVC245ARGYR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC245ARGYR 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 SN74LVC245ARGYR reliable?
The price and inventory of SN74LVC245ARGYR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC245ARGYR is usually 5 days.
3.What payment methods are accepted for SN74LVC245ARGYR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC245ARGYR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC245ARGYR?
SN74LVC245ARGYR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC245ARGYR 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 SN74LVC245ARGYR?
For technical support, including SN74LVC245ARGYR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC245ARGYR requirements.
6.How does Aetrix verify that SN74LVC245ARGYR is sourced from the original manufacturer or authorized distributors?
All SN74LVC245ARGYR 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 SN74LVC245ARGYR meets industry standards.
7.What is the process for return or replacement of SN74LVC245ARGYR?
All SN74LVC245ARGYR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC245ARGYR, 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 SN74LVC245ARGYR part is unused and in its original packaging.
Return procedure for SN74LVC245ARGYR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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