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Texas Instruments SN74LV245ARGYR
- Part No.:
- SN74LV245ARGYR
- Manufacturer:
- Texas Instruments
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
SN74LV245ARGYR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,990
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Product details
Overview
SN74LV245ARGYR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between voltage domains. It operates from 2 V to 5.5 V, delivers ≤6.5 ns propagation delay at 5 V, supports mixed-mode I/O (e.g., 5-V inputs into 3.3-V system), and features Ioff partial-power-down protection. It is used in LED display column drivers where level-shifting and bus isolation are required.
For engineers reviewing the SN74LV245ARGYR datasheet, SN74LV245ARGYR pinout, SN74LV245ARGYR application, or SN74LV245ARGYR equivalent, key selection criteria include its 20-pin VQFN (RGY) package with 4.5 mm × 3.5 mm footprint, guaranteed 35 mA output drive per pin, −40°C to +125°C operating range, and validated performance in telecom infrastructure backplane interfaces.
Technical Context
The SN74LV245ARGYR implements a dual-bus directional control architecture using DIR and OE inputs: DIR selects data flow direction (A→B or B→A), while OE enables/disables all outputs into high-impedance state. Its Ioff circuitry actively blocks current flow when VCC = 0 V, enabling safe hot-insertion in powered-backplane systems.
It achieves voltage translation via overvoltage-tolerant inputs (rated to 5.5 V regardless of VCC) and rail-referenced CMOS outputs. Switching characteristics are specified across three VCC conditions (2.5 V, 3.3 V, 5 V), with tpd as low as 4.3 ns (typ) at 5 V/15 pF load and 25°C - confirmed in Table 6.8 of SCLS382R Rev R.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports single-supply operation across 3.3-V and 5-V logic domains without external level shifters. |
| tpd (max) | 6.5 ns at VCC = 5 V, CL = 15 pF - ensures sub-10-ns timing margin for 100-MHz bus handshaking in network switch control planes. |
| Ioff Current | ≤5 µA at VCC = 0 V - prevents backflow during partial power-down, critical for PCIe hot-plug and modular server designs. |
| Output Drive | ±35 mA per pin - sufficient to directly drive 50-Ω transmission lines or LED display segments without external buffers. |
| ESD Rating | 2000-V HBM - meets industrial-grade robustness requirements for factory-floor deployment in motor driver PCBs. |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive infotainment gateways and telecom base station line cards. |
Pinout & Package
VQFN-20 (RGY) package: 4.50 mm × 3.50 mm body, 0.5-mm pitch, exposed thermal pad, RoHS-compliant NiPdAu lead finish, MSL Level-2 (260°C, 1 year).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | High = A→B data flow; Low = B→A; determines bus arbitration path in dual-processor interconnects. |
| A1–A8 (Pins 2–9) | Port A bidirectional I/O | Connects to microcontroller GPIO or FPGA bank; accepts up to 5.5 V regardless of VCC - enables down-translation. |
| GND (Pin 10) | Ground reference | Primary return path for all I/O and internal logic; must be low-inductance connection to minimize ground bounce (VOLP < 0.8 V @ 3.3 V). |
| B1–B8 (Pins 11–18) | Port B bidirectional I/O | Drives external bus (e.g., LED column lines); outputs swing rail-to-rail (VOH ≥ VCC − 0.1 V, VOL ≤ 0.1 V). |
| OE (Pin 19) | Output enable input | Active-Low; asserts high-Z on both ports simultaneously - essential for bus contention avoidance in multi-master systems. |
| VCC (Pin 20) | Power supply | Single supply for core and I/O; bypass capacitor (0.1 µF) required adjacent to pin to suppress switching noise per Section 9.3. |
| Thermal Pad | Exposed die attach pad | Must be soldered to PCB ground plane to achieve RθJA = 34.1°C/W - critical for thermal reliability at 125°C ambient. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage operation | Inputs tolerate 0–5.5 V independent of VCC - allows 5-V sensor interface to 3.3-V MCU without discrete level shifters. |
| Ioff partial-power-down | Blocks >99.9% of back-current when VCC = 0 V - enables safe insertion into live backplanes per JESD78. |
| Low ground bounce (VOLP) | <0.8 V @ 3.3 V - reduces signal integrity risk in dense LED display PCBs with shared ground returns. |
| Slow edge rate control | Δt/Δv ≥ 20 ns/V @ 5 V - minimizes EMI and overshoot on long traces driving capacitive loads like LCD column lines. |
| Latch-up immunity | >250 mA per JESD17 - ensures robustness against transient faults in industrial motor driver gate-drive circuits. |
Applications
| LED Display Driver | Telecom Backplane Interface |
|---|---|
|
Use Scenario: Driving 8×8 LED matrix columns with row-scanned current sinks. IC Role / Device Role / Timing Role: Bidirectional bus transceiver isolating MCU GPIO from high-current column drivers; DIR toggled per frame, OE synchronized with row enable. Use Value: Eliminates need for discrete MOSFET switches; 35 mA per output directly drives common-anode LEDs at 5 V, while 3.3-V MCU logic remains protected. |
Use Scenario: Interfacing 3.3-V FPGA control logic to 5-V legacy PHY modules on telecom line card backplane. IC Role / Device Role / Timing Role: Voltage-translating bus buffer enabling protocol-agnostic data exchange; DIR fixed for unidirectional control register writes, OE managed by FPGA reset sequence. Use Value: Supports mixed-voltage operation without external biasing; 6.5 ns tpd preserves setup/hold margins for 25-MHz MDIO bus timing. |
| Industrial I/O Expander | Motor Driver Control Hub |
|
Use Scenario: Extending PLC digital I/O count via SPI-connected microcontroller with parallel peripheral interface. IC Role / Device Role / Timing Role: Octal transceiver buffering microcontroller parallel port to opto-isolated output stage; OE tied to SPI chip-select for automatic bus release. Use Value: Ioff protection prevents leakage into unpowered I/O modules during firmware updates; −40°C to +125°C rating suits factory-floor enclosures. |
Use Scenario: Isolating microcontroller PWM outputs from half-bridge gate drivers in BLDC motor controller. IC Role / Device Role / Timing Role: Direction-controlled bus interface routing speed commands from MCU to gate-driver ICs; DIR set for MCU→driver flow, OE pulsed during fault shutdown. Use Value: 2000-V HBM ESD rating withstands EMI in noisy motor environments; slow edges reduce dv/dt-induced shoot-through risk in SiC gate drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245A | Lower VCC min (1.65 V), higher max tpd (7.2 ns @ 3.3 V), identical pinout and function. | Better suited for battery-powered 1.8-V systems; slightly reduced timing margin in high-speed 5-V buses. | Choose SN74LVC245A only if 1.65–3.6-V operation is mandatory; SN74LV245ARGYR preferred for 2–5.5-V flexibility and tighter tpd. |
| 74ALVC245 | Faster tpd (2.8 ns @ 3.3 V), but narrower VCC range (2.3–3.6 V), no Ioff, and higher ICC (40 µA vs 20 µA). | Optimized for high-speed 3.3-V-only applications; lacks hot-swap safety for mixed-power systems. | Select 74ALVC245 only when sub-3-ns timing is critical and full power-down isolation is unnecessary. |
Compared with SN74LVC245A and 74ALVC245, the SN74LV245ARGYR uniquely balances wide VCC range (2–5.5 V), industrial temperature support (−40°C to +125°C), Ioff-enabled hot-swap capability, and verified 6.5-ns timing - making it optimal for cross-domain interfaces in servers and telecom infrastructure where voltage flexibility and reliability outweigh raw speed.
Availability
SN74LV245ARGYR is available at Aetrix Electronics and suitable for LED displays, telecom infrastructure, industrial I/O expanders, and motor driver control hubs requiring stable component supply across extended temperature ranges and mixed-voltage environments.
Supply support for SN74LV245ARGYR 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 decades of expertise in logic interface solutions.
The SN74LV245A product line was engineered for robust bidirectional bus interfacing in mixed-voltage systems - targeting servers, telecom equipment, and industrial automation where reliability across voltage domains and temperature extremes is non-negotiable.
FAQ
What is the maximum output current per pin for SN74LV245ARGYR?
The SN74LV245ARGYR supports ±35 mA continuous output current per pin, as specified in Section 6.1 Absolute Maximum Ratings. This value is validated across the full −40°C to +125°C operating range and enables direct drive of moderate-current loads such as LED segments or terminated transmission lines without external buffers. Exceeding this limit risks parametric shift or latch-up.
Does SN74LV245ARGYR support hot-swap operation?
Yes, SN74LV245ARGYR supports hot-swap via its Ioff feature: when VCC = 0 V, Ioff limits current flow to ≤5 µA (Section 6.5), preventing damaging back-current from live buses into unpowered circuitry. This is validated per JESD78 and enables safe insertion into powered backplanes - a key requirement in modular server and telecom chassis designs.
What is the thermal resistance (RθJA) of SN74LV245ARGYR in its VQFN package?
The SN74LV245ARGYR in the RGY package has a junction-to-ambient thermal resistance (RθJA) of 34.1°C/W, as published in Table 6.4 Thermal Information. This low value is achieved through the exposed thermal pad, which must be soldered to a PCB ground plane. At 125°C ambient and 20-mA average output current, this enables reliable operation without forced airflow.
Can SN74LV245ARGYR translate 5-V signals to a 3.3-V system?
Yes, SN74LV245ARGYR enables down-translation: its inputs accept voltages up to 5.5 V regardless of VCC setting (Section 8.3), so 5-V signals applied to A or B ports are safely interpreted by the 3.3-V-powered device. Outputs then swing rail-to-rail (0 V to 3.3 V), providing clean 3.3-V logic levels to downstream receivers - confirmed in Figure 9-1 Typical Application.
What is the recommended bypass capacitor for SN74LV245ARGYR?
Texas Instruments recommends a 0.1-µF ceramic bypass capacitor placed as close as possible to the VCC pin (Pin 20) of SN74LV245ARGYR, per Section 9.3 Power Supply Recommendations. For systems with multiple VCC connections or high-frequency noise, paralleling a 1-µF capacitor improves suppression across broader frequency bands - critical for maintaining VOLP < 0.8 V in LED display applications.
SN74LV245ARGYR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- 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:
- 16mA, 16mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VQFN (3.5x4.5)
SN74LV245ARGYR FAQ
1.How can I place an order for SN74LV245ARGYR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV245ARGYR 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 SN74LV245ARGYR reliable?
The price and inventory of SN74LV245ARGYR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV245ARGYR is usually 5 days.
3.What payment methods are accepted for SN74LV245ARGYR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV245ARGYR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV245ARGYR?
SN74LV245ARGYR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV245ARGYR 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 SN74LV245ARGYR?
For technical support, including SN74LV245ARGYR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV245ARGYR requirements.
6.How does Aetrix verify that SN74LV245ARGYR is sourced from the original manufacturer or authorized distributors?
All SN74LV245ARGYR 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 SN74LV245ARGYR meets industry standards.
7.What is the process for return or replacement of SN74LV245ARGYR?
All SN74LV245ARGYR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV245ARGYR, 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 SN74LV245ARGYR part is unused and in its original packaging.
Return procedure for SN74LV245ARGYR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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