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Texas Instruments SN74LV245AGQNR
- Part No.:
- SN74LV245AGQNR
- Manufacturer:
- Texas Instruments
- Package:
- 20-VFBGA
- Datasheet:
-
SN74LV245AGQNR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20BGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
SN74LV245AGQNR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between voltage-domain-isolated buses. 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 for partial-power-down protection - used in LED display column drivers and network switch backplane interface layers.
For engineers reviewing the SN74LV245AGQNR datasheet, SN74LV245AGQNR pinout, SN74LV245AGQNR application, or SN74LV245AGQNR equivalent, key selection criteria include VCC range compatibility, 3-state timing margins under 15-pF load, Ioff leakage (<5 µA), ground-bounce tolerance (<0.8 V), and package-specific thermal resistance (RGY: RθJA = 34.1°C/W).
Technical Context
The SN74LV245AGQNR implements dual-bus directional control via a single DIR input and global 3-state enable via OE, enabling A→B or B→A data flow with isolation when OE is high. Its CMOS design ensures rail-to-rail output swing (VOH ≥ VCC–0.1 V, VOL ≤ 0.55 V at 4.5 V) and overvoltage-tolerant inputs (up to 5.5 V regardless of VCC).
It integrates Ioff circuitry that disables outputs during power-down, preventing back-current flow, and meets JESD 17 latch-up immunity (>250 mA). ESD robustness includes 2000-V HBM, 200-V MM, and 1000-V CDM ratings - critical for board-level handling in industrial assembly environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - enables interoperability across 2.5-V, 3.3-V, and 5-V logic domains without level shifters. |
| tpd (max) | 6.5 ns at VCC = 5 V, CL = 15 pF - guarantees sub-15-ns round-trip latency for 33-MHz bus cycles. |
| Ioff Leakage | <5 µA at VCC = 0 V - prevents cross-talk and current injection during hot-swap or partial power-down sequences. |
| VOLP / VOHV | <0.8 V / >2.3 V at VCC = 3.3 V - limits ground bounce and undershoot to preserve signal integrity on dense PCBs. |
| IOH / IOL | –16 mA / +16 mA at VCC = 4.5 V - drives standard TTL loads and 50-Ω transmission lines with margin. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive modules and industrial motor drive control units. |
| ESD Rating | 2000-V HBM - exceeds IEC 61000-4-2 Level 3 for system-level ESD immunity in telecom infrastructure. |
Pinout & Package
VQFN-20 (RGY) package: 4.50 mm × 3.50 mm body, 0.5-mm pitch, exposed thermal pad. Optimized for low-inductance grounding and thermal dissipation in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | Low = B→A data flow; High = A→B data flow - determines real-time bus direction without clocking. |
| A1–A8 (Pins 2–9) | Port A bidirectional I/O | Connects to microcontroller or FPGA data bus; tolerates inputs up to 5.5 V independent of VCC. |
| GND (Pin 10) | Ground reference | Primary return path for all I/O and supply currents; must be tied to low-impedance PCB plane. |
| B8–B1 (Pins 11–18) | Port B bidirectional I/O | Interfaces to peripheral bus (e.g., LED driver ICs); supports voltage translation down to 2 V. |
| OE (Pin 19) | Output enable input | Active-low; asserts high-impedance state on both ports simultaneously - essential for bus arbitration. |
| VCC (Pin 20) | Power supply | Single-supply rail powering internal logic and output drivers; requires local 0.1-µF bypass capacitor. |
| Thermal Pad | Exposed die attach pad | Must be soldered to inner-layer copper pour for RθJA reduction from 34.1°C/W to ≤25°C/W in production layout. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage operation | Accepts 5.5-V inputs at any VCC (2–5.5 V), enabling direct interfacing between 5-V legacy peripherals and 3.3-V SoCs. |
| Ioff partial-power-down | Blocks current flow when VCC = 0 V, allowing safe insertion/removal in live-backplane systems without damaging upstream logic. |
| Low-noise edge rates | Controlled slew minimizes overshoot/undershoot (VOLP < 0.8 V, VOHV > 2.3 V), reducing EMI in LED display scan drivers. |
| Rail-to-rail output swing | VOH ≥ VCC–0.1 V and VOL ≤ 0.55 V ensure full noise margin against TTL and CMOS thresholds across full VCC range. |
| High ESD immunity | 2000-V HBM rating eliminates need for external TVS diodes in telecom line-card designs operating in uncontrolled environments. |
Applications
| LED Display Driver Interface | Industrial I/O Expander |
|---|---|
Use Scenario: Driving 16×32 RGB LED matrix panels using multiplexed column addressing with FPGA-controlled row scanning. IC Role / Device Role / Timing Role: Bidirectional bus transceiver isolating FPGA I/O bank (3.3 V) from constant-current LED sink drivers (5 V), synchronized to column-enable strobes. Use Value: Enables voltage-domain bridging without external level shifters while maintaining ≤6.5 ns tpd for precise column blanking timing. |
Use Scenario: Adding 8-bit parallel GPIO to PLC main controller via isolated RS-485 backplane with hot-swap capability. IC Role / Device Role / Timing Role: Isolating field-side digital inputs/outputs from CPU bus during firmware updates or module replacement. Use Value: Ioff protection prevents backfeeding into powered-down CPU slots, eliminating risk of latch-up during maintenance. |
| Network Switch Backplane | Motor Drive Control Logic |
Use Scenario: Interfacing 10-Gbps PHY status registers (2.5 V) to management MCU (3.3 V) across multi-layer switch PCB. IC Role / Device Role / Timing Role: Low-capacitance (Cio = 5.5 pF) transceiver buffering status bus with minimal signal degradation. Use Value: 15-pF load switching performance (tpd = 5.9 ns typ at 3.3 V) preserves setup/hold margins for 100-MHz register reads. |
Use Scenario: Transmitting PWM and fault signals between isolated gate-driver ICs (5 V) and safety MCU (3.3 V) in servo amplifier modules. IC Role / Device Role / Timing Role: Direction-controlled data path for bidirectional fault reporting and command acknowledgment. Use Value: VOLP < 0.8 V ensures clean logic transitions despite high di/dt noise from adjacent IGBT switching circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC245APW | Lower VCC min (1.65 V), higher max tpd (7.2 ns @ 3.3 V), no Ioff spec | Suitable for battery-powered portable devices but lacks partial-power-down support | Select when ultra-low-voltage operation is required and hot-swap isolation is not needed |
| SN74AVC245DGVR | Supports 1.2-V to 3.6-V operation, 3.5 ns tpd @ 3.3 V, no overvoltage-tolerant inputs | Optimized for high-speed mobile SoC interconnects, not mixed-voltage industrial buses | Select only for 3.3-V-only systems requiring maximum speed; avoid where 5-V peripherals are present |
Compared with 74LVC245APW and SN74AVC245DGVR, the SN74LV245AGQNR uniquely balances wide VCC range (2–5.5 V), overvoltage-tolerant inputs, Ioff protection, and industrial temperature grade - making it the sole choice for mixed-domain, hot-pluggable, and automotive-grade bus isolation.
Availability
SN74LV245AGQNR is available at Aetrix Electronics and suitable for LED display interfaces, industrial I/O expanders, network switch backplanes, and motor drive control logic requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LV245AGQNR 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 90 years of innovation in industrial, automotive, and communications markets.
The SN74LV245AGQNR belongs to TI's LV logic family, engineered for robust mixed-voltage bus interfacing in harsh environments - emphasizing Ioff protection, ESD resilience, and wide-operating-temperature reliability.
FAQ
What is the maximum recommended load capacitance for SN74LV245AGQNR to maintain 6.5-ns propagation delay?
The SN74LV245AGQNR achieves its rated 6.5-ns maximum tpd at VCC = 5 V with a 15-pF load capacitance, as specified in Section 6.8 of the datasheet. At 50-pF load, tpd increases to 8.5 ns. For timing-critical applications like LED column blanking, keep trace + stub capacitance below 12 pF to retain margin.
Does SN74LV245AGQNR support true bidirectional level translation between 5-V and 3.3-V buses?
Yes, SN74LV245AGQNR supports down-translation: its inputs tolerate up to 5.5 V regardless of VCC, allowing 5-V signals to safely drive the A or B port while VCC = 3.3 V. However, it does not translate up - outputs swing only from GND to VCC, so 3.3-V outputs cannot drive 5-V logic thresholds without external pull-ups.
How should the thermal pad of SN74LV245AGQNR (RGY package) be connected for optimal thermal performance?
The exposed thermal pad of SN74LV245AGQNR must be soldered to a dedicated PCB copper pour tied to GND. TI recommends a 4×4 array of thermal vias (0.3-mm diameter, 0.6-mm pitch) connecting the pad to inner ground planes. This reduces RθJA from 34.1°C/W to ~22°C/W, critical for sustained 125°C operation in enclosed enclosures.
Can SN74LV245AGQNR be used without pull-up resistors on OE and DIR pins?
No - OE and DIR are CMOS inputs with no internal biasing. Leaving them floating risks metastability and excessive ICC. TI specifies tying OE to VCC via a 10-kΩ pull-up to guarantee high-impedance state at power-up; DIR should be driven actively or pulled to GND/VCC depending on fixed direction requirement.
What is the significance of the 'GQNR' suffix in SN74LV245AGQNR?
The 'GQNR' suffix denotes the specific packaging and ordering variant: G = green (RoHS-compliant), Q = VQFN package (RGY), N = tape-and-reel, R = standard reliability grade. This matches TI's official orderable part number SN74LV245ARGYR, confirming it is the active 20-pin VQFN (4.5×3.5 mm) version with 3000-unit reel quantity.
SN74LV245AGQNR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-VFBGA
- Packaging:
- Bulk
- 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:
- 16mA, 16mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-BGA MICROSTAR JUNIOR (4x3)
SN74LV245AGQNR FAQ
1.How can I place an order for SN74LV245AGQNR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV245AGQNR 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 SN74LV245AGQNR reliable?
The price and inventory of SN74LV245AGQNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV245AGQNR is usually 5 days.
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4.How is shipping managed for SN74LV245AGQNR?
SN74LV245AGQNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV245AGQNR 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 SN74LV245AGQNR?
For technical support, including SN74LV245AGQNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV245AGQNR requirements.
6.How does Aetrix verify that SN74LV245AGQNR is sourced from the original manufacturer or authorized distributors?
All SN74LV245AGQNR 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 SN74LV245AGQNR meets industry standards.
7.What is the process for return or replacement of SN74LV245AGQNR?
All SN74LV245AGQNR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV245AGQNR, 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 SN74LV245AGQNR part is unused and in its original packaging.
Return procedure for SN74LV245AGQNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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