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Texas Instruments SN74LVCH245AGQNR
- Part No.:
- SN74LVCH245AGQNR
- Manufacturer:
- Texas Instruments
- Package:
- 20-VFBGA
- Datasheet:
-
SN74LVCH245AGQNR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20BGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,721
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Product details
Overview
SN74LVCH245AGQNR from Texas Instruments is an octal bus transceiver with tri-state outputs, designed for 1.65 V to 3.6 V operation and supporting mixed-mode 3.3-V/5-V signal translation. It features direction control (DIR), active-low output enable (OE), bus-hold on all data inputs, Ioff for live insertion, and a max propagation delay of 6.3 ns at 3.3 V. It is used in bidirectional data bus isolation and voltage-level translation between processor and peripheral buses in compact embedded systems.
For engineers reviewing the SN74LVCH245AGQNR datasheet, SN74LVCH245AGQNR pinout, SN74LVCH245AGQNR application, or SN74LVCH245AGQNR equivalent, key selection criteria include its 1.65–3.6 V supply range, 5.5 V-tolerant inputs, Ioff-enabled partial-power-down capability, bus-hold functionality eliminating external resistors, and verified 20-pin QFN (GQN) package compatibility with high-density PCB layouts.
Technical Context
This device implements asynchronous bidirectional data transfer between two 8-bit buses using a single DIR input to select direction (A→B or B→A) and an active-low OE input to place all outputs in high-impedance state. Its CMOS input structure supports 5.5 V tolerant inputs independent of VCC, enabling safe interfacing with legacy 5-V logic while operating from as low as 1.65 V.
The integrated bus-hold circuit maintains valid logic states on floating A/B port inputs without external biasing, and the Ioff feature actively disables outputs during power-down to prevent back-drive current-critical for hot-plug and multi-rail system designs. Thermal metrics confirm suitability for industrial temperature range (–40°C to 125°C) operation in thermally constrained packages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - Enables direct integration into low-voltage SoC domains while maintaining compatibility with 3.3-V infrastructure. |
| Input Voltage Tolerance | Up to 5.5 V - Allows connection to 5-V drivers without level-shifting components in mixed-voltage systems. |
| Max Propagation Delay | 6.3 ns at VCC = 3.3 V - Supports >100 MHz data throughput in synchronous bus applications with tight timing budgets. |
| Ioff Leakage | ±10 µA at VCC = 0 V - Ensures robust isolation during partial power-down, preventing back-current damage in live-insertion scenarios. |
| Bus-Hold Current | ±75 µA at VCC = 3.0 V - Actively sustains logic state on un-driven A/B pins, eliminating need for external pull-up/down resistors and saving board space. |
| ESD Rating (HBM) | 2000 V - Meets JEDEC JS-001 Class 2 requirements for handling robustness in automated assembly and field environments. |
| Operating Temperature | –40°C to +125°C - Qualified for industrial and extended-temperature embedded applications including networking and automotive ECUs. |
Pinout & Package
The SN74LVCH245AGQNR is packaged in a 20-pin VQFN (GQN) with 0.4 mm pitch, measuring 3.5 mm × 3.5 mm × 0.8 mm (body size nominal), optimized for high-density routing and thermal performance in space-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | High = A→B data flow; Low = B→A - Enables dynamic bus arbitration without reconfiguration logic. |
| 2–9 (A1–A8) | Port A bidirectional I/O | Connects to master-side bus (e.g., MCU or FPGA); bus-hold active regardless of OE/DIR state. |
| 10 (GND) | Ground reference | Primary return path for all I/O and supply currents; requires low-inductance connection to minimize ground bounce. |
| 11–18 (B1–B8) | Port B bidirectional I/O | Connects to slave-side bus (e.g., memory or peripheral); electrically identical to A-port with same bus-hold behavior. |
| 19 (OE) | Output enable (active low) | Pulling low enables transceiver; high places all A/B pins in high-Z - critical for bus sharing and conflict avoidance. |
| 20 (VCC) | Positive supply | Single supply powers internal logic and I/O buffers; must be decoupled locally with 0.1 µF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage translation | Accepts 0–5.5 V inputs while operating from 1.65–3.6 V VCC - eliminates discrete level shifters in 3.3/5-V interconnects. |
| Integrated bus-hold | Eliminates external pull resistors on all 16 data lines - reduces BOM count, layout area, and risk of floating node failures. |
| Ioff partial-power-down | Prevents back-drive current when VCC = 0 V - enables safe hot-swap in modular systems and battery-backed subsystems. |
| Low ground bounce (VOLP & VOHV) | Typical VOLP < 0.8 V and VOHV > 2 V at 3.3 V - ensures signal integrity during fast switching in noise-sensitive analog-adjacent layouts. |
| Latch-up immunity | Exceeds 250 mA per JESD17 - guarantees robust operation under transient overvoltage or ESD stress without destructive latch-up. |
Applications
| Industrial PLC Backplane Interface | Embedded Edge AI Module Data Bridge |
|---|---|
Use Scenario: Isolating and translating between a 3.3-V ARM-based controller bus and legacy 5-V I/O expansion modules in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional bus transceiver providing direction-controlled data flow and voltage-level translation with sub-7 ns latency. Use Value: Enables drop-in upgrade of legacy 5-V peripherals without redesigning power rails or adding discrete translators - reducing time-to-market by 3+ weeks. |
Use Scenario: Connecting a low-power vision processor's 1.8-V parallel interface to a 3.3-V image sensor array in edge AI inference cameras. IC Role / Device Role / Timing Role: Level-translating octal transceiver with bus-hold holding sensor data lines stable during processor sleep cycles. Use Value: Eliminates 16 external pull resistors and supports seamless wake-from-sleep data handoff - cutting PCB area by 12 mm² and power leakage by 45 µA. |
| Automotive ADAS Camera Link Buffer | 5G Small Cell Baseband Processor Interconnect |
Use Scenario: Buffering and isolating MIPI CSI-2 parallel debug traces between camera module and domain controller in AEC-Q100 qualified ADAS systems. IC Role / Device Role / Timing Role: High-speed, low-skew (1 ns max) transceiver ensuring deterministic timing alignment across 8-bit parallel video lanes. Use Value: Maintains signal fidelity up to 100 MHz while meeting –40°C to +125°C automotive temp grade - avoiding costly requalification of alternate solutions. |
Use Scenario: Interfacing a 3.3-V FPGA baseband processor with 5-V RF front-end ICs in compact 5G small cell radios. IC Role / Device Role / Timing Role: Direction-controlled bus isolator with Ioff protection during FPGA configuration resets and RF power cycling. Use Value: Prevents back-drive damage during simultaneous power sequencing mismatches - increasing field reliability and reducing warranty returns by ~18%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245A | No bus-hold; no Ioff; 1.65–3.6 V VCC; 5.5 V-tolerant inputs retained. | Lacks live-insertion support and floating-input stabilization - requires external pull resistors and careful power sequencing. | Select when cost sensitivity outweighs need for bus-hold/Ioff, and system design includes explicit biasing and sequencing controls. |
| TXS0108E | Auto-direction sensing; no DIR pin; 1.2–3.6 V VCC; higher capacitance (10 pF); lower drive (±8 mA). | Eliminates direction control logic but adds latency (~10 ns) and limits max frequency in high-speed synchronous buses. | Prefer for simple glue logic where direction is predictable and speed < 25 MHz; avoid for deterministic low-latency control paths. |
Compared with SN74LVC245A and TXS0108E, the SN74LVCH245AGQNR uniquely combines bus-hold, Ioff, and sub-7 ns propagation delay in a 3.5 mm × 3.5 mm QFN - making it optimal for thermally dense, hot-pluggable, and resistor-free embedded interfaces requiring precise timing control.
Availability
SN74LVCH245AGQNR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive ADAS camera links, 5G small cell interconnects, embedded edge AI modules, and telecom infrastructure requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVCH245AGQNR 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 experience delivering high-reliability logic and interface solutions for industrial, automotive, and communications markets.
The SN74LVCH245A product line delivers robust, low-voltage octal transceivers engineered for mixed-signal system integration - specifically targeting voltage translation, bus isolation, and hot-swap-capable interconnects in space- and power-constrained embedded platforms.
FAQ
What is the maximum operating temperature for the SN74LVCH245AGQNR?
The SN74LVCH245AGQNR is rated for operation from –40°C to +125°C ambient temperature, fully specified across this industrial-extended range per its Recommended Operating Conditions table. This makes the SN74LVCH245AGQNR suitable for under-hood automotive modules, industrial motor drives, and outdoor telecom equipment where thermal margins are critical.
Does the SN74LVCH245AGQNR require external pull-up or pull-down resistors on its A/B ports?
No. The SN74LVCH245AGQNR integrates active bus-hold circuitry on all 16 data I/O pins (A1–A8, B1–B8), which maintains valid logic states on floating inputs without external resistors. Using external biasing with the SN74LVCH245AGQNR is not recommended, as it conflicts with the internal bus-hold function and may cause excessive current draw or logic contention.
Can the SN74LVCH245AGQNR safely interface a 5-V microcontroller with a 1.8-V FPGA?
Yes - the SN74LVCH245AGQNR accepts input voltages up to 5.5 V regardless of VCC, allowing 5-V signals to drive its A or B ports while operating from 1.8 V. Its outputs swing rail-to-rail (0 V to VCC), so when powered at 1.8 V, it delivers clean 1.8-V logic levels to the FPGA - enabling reliable bidirectional translation without additional level-shifting ICs.
What is the purpose of the Ioff feature in the SN74LVCH245AGQNR?
The Ioff feature in the SN74LVCH245AGQNR disables all outputs when VCC = 0 V, preventing damaging back-drive current from live buses into a powered-down device. This supports safe live insertion, partial power-down modes, and robust operation in multi-rail systems - a key requirement validated per JESD78 and explicitly tested for the SN74LVCH245AGQNR in its datasheet.
Is the SN74LVCH245AGQNR pin-compatible with other 20-pin octal transceivers like the SN74LVC245A?
No - the SN74LVCH245AGQNR uses the GQN (VQFN-20) package with a unique 3.5 mm × 3.5 mm footprint and 0.4 mm pitch, whereas SN74LVC245A variants commonly use SOIC-20, TSSOP-20, or TVSOP-20 packages. Pin functions are identical (DIR, OE, A1–A8, B1–B8, GND, VCC), but mechanical layout and thermal pad requirements differ significantly - requiring separate PCB land patterns.
SN74LVCH245AGQNR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCH
- Package/Case:
- 20-VFBGA
- Packaging:
- Tape & Reel (TR)
- 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:
- 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-BGA MICROSTAR JUNIOR (4x3)
SN74LVCH245AGQNR FAQ
1.How can I place an order for SN74LVCH245AGQNR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCH245AGQNR 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 SN74LVCH245AGQNR reliable?
The price and inventory of SN74LVCH245AGQNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCH245AGQNR is usually 5 days.
3.What payment methods are accepted for SN74LVCH245AGQNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVCH245AGQNR transactions.
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4.How is shipping managed for SN74LVCH245AGQNR?
SN74LVCH245AGQNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVCH245AGQNR 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 SN74LVCH245AGQNR?
For technical support, including SN74LVCH245AGQNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCH245AGQNR requirements.
6.How does Aetrix verify that SN74LVCH245AGQNR is sourced from the original manufacturer or authorized distributors?
All SN74LVCH245AGQNR 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 SN74LVCH245AGQNR meets industry standards.
7.What is the process for return or replacement of SN74LVCH245AGQNR?
All SN74LVCH245AGQNR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCH245AGQNR, 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 SN74LVCH245AGQNR part is unused and in its original packaging.
Return procedure for SN74LVCH245AGQNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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