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Texas Instruments SN74LVC245AZQNR
- Part No.:
- SN74LVC245AZQNR
- Manufacturer:
- Texas Instruments
- Package:
- 20-VFBGA
- Datasheet:
-
SN74LVC245AZQNR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20BGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,520
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Product details
Overview
SN74LVC245AZQNR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between 1.65-V to 3.6-V buses. It features direction control (DIR), output enable (OE), 5.5-V-tolerant inputs, 6.3 ns max propagation delay at 3.3 V, and Ioff support for live insertion in mixed-voltage systems - used in LED displays, network switches, and I/O expanders.
For engineers reviewing the SN74LVC245AZQNR datasheet, SN74LVC245AZQNR pinout, SN74LVC245AZQNR application, or SN74LVC245AZQNR equivalent, key selection criteria include voltage translation capability (5 V ↔ 3.3 V), 20-pin VQFN package thermal performance, 3-state bus isolation timing, and Ioff-enabled partial-power-down robustness in hot-swap environments.
Technical Context
The SN74LVC245AZQNR implements dual-bus bidirectional data flow controlled by a single DIR input: high enables A→B transmission, low enables B→A. Its OE input places all eight channels into high-impedance state, enabling bus isolation. The device uses CMOS logic with balanced drive strength and supports mixed-mode signal operation across voltage domains.
It incorporates Ioff circuitry that disables outputs during power-down to prevent back-drive current, meets JESD 17 latch-up >250 mA, and provides ESD protection per JESD 22 (2000-V HBM, 1000-V CDM). All inputs tolerate up to 5.5 V independent of VCC, enabling use as a level translator in 5-V/3.3-V interface bridges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports operation across low-voltage embedded rails including 1.8 V and 3.3 V systems |
| Max tpd | 6.3 ns at 3.3 V - ensures sub-7 ns latency for high-speed bus arbitration in real-time interfaces |
| Input Voltage Tolerance | Up to 5.5 V - allows direct connection to 5-V logic without external level shifters |
| Ioff Support | Enabled - prevents damaging current flow during partial power-down or hot insertion |
| Output Drive | ±24 mA at 3 V - sufficient to drive moderate capacitive loads and longer PCB traces |
| ESD Rating | 2000-V HBM, 1000-V CDM - exceeds industrial handling requirements for assembly and field service |
| Operating Temp | –40°C to +125°C - qualified for automotive under-hood and industrial control cabinet deployment |
Pinout & Package
VQFN-20 (RGY) package: 4.50 mm × 3.50 mm body, 0.5-mm pitch, exposed thermal pad - optimized for compact layout and thermal dissipation in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | High = A→B data flow; Low = B→A - determines real-time bus directionality without reconfiguration |
| 19 (OE) | Output Enable Input | Low = active transceiver; High = all outputs in high-Z - enables dynamic bus arbitration and isolation |
| A1–A8 (Pins 2–9) | Port A I/O | Bidirectional data lines tied to one bus segment - tolerant of 5.5 V regardless of VCC |
| B1–B8 (Pins 11–18) | Port B I/O | Bidirectional data lines tied to second bus segment - electrically isolated from Port A when OE = high |
| 10 (GND) | Ground Reference | Primary return path for logic and switching currents - must be low-inductance connection to minimize noise |
| 20 (VCC) | Power Supply | Single supply for core logic and I/O - requires local 0.1-µF bypass capacitor adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Overvoltage-tolerant inputs | Accepts 0–5.5 V signals at any valid VCC (1.65–3.6 V), enabling seamless 5-V-to-3.3-V translation without external components |
| Live-insertion support | Ioff functionality disables outputs during power-off, eliminating back-current risk when inserting into live backplanes or hot-swap modules |
| Low ground bounce | Typical VOLP < 0.8 V at VCC = 3.3 V - reduces simultaneous switching noise in dense digital layouts |
| Mixed-mode signal operation | Supports interoperability between 5-V, 3.3-V, and 1.8-V logic families on same bus pair - verified across full operating temperature range |
| Fast propagation delay | 6.3 ns max at 3.3 V - meets timing budgets for high-throughput peripheral interconnects such as display drivers and sensor hubs |
Applications
| LED Display Driver Interface | Industrial Network Switch Backplane |
|---|---|
Use Scenario: Driving column/row lines of multiplexed LED matrices requiring high-current sink/source and voltage-level bridging between microcontroller (3.3 V) and LED driver ICs (5 V). IC Role / Device Role / Timing Role: Bidirectional level-translating bus buffer managing data flow between MCU GPIO and external LED driver registers. Use Value: Eliminates discrete level shifters; 24-mA drive sustains brightness across 8-bit parallel segments; Ioff prevents latch-up during firmware updates. | Use Scenario: Isolating CPU-side control bus from switch fabric ASICs operating at different supply voltages in managed Ethernet switches. IC Role / Device Role / Timing Role: Asynchronous bidirectional data conduit enabling register read/write access while maintaining domain separation. Use Value: 6.3-ns tpd preserves setup/hold margins across 25-MHz control interfaces; 5.5-V tolerance accommodates legacy 5-V management peripherals. |
| Motor Control I/O Expander | Automotive Body Control Module |
Use Scenario: Extending GPIO count of low-pin-count MCUs to manage relays, sensors, and status LEDs in HVAC or power seat subsystems. IC Role / Device Role / Timing Role: Configurable 8-bit I/O expander with direction-controlled data mirroring between MCU and peripheral cluster. Use Value: DIR/OE pins allow runtime reconfiguration without firmware overhead; –40°C to +125°C rating matches under-dash thermal envelope. | Use Scenario: Interfacing 3.3-V CAN controller with 5-V analog sensor cluster and discrete power switches in door module ECUs. IC Role / Device Role / Timing Role: Voltage-domain bridge isolating fault-sensitive CAN logic from noisy high-side switch control lines. Use Value: Ioff blocks reverse current during battery disconnect events; 2000-V HBM withstands vehicle ESD pulses per ISO 10605. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC245ADW | SOIC-20 package (12.8 mm × 7.5 mm); higher RθJA (78°C/W); no exposed thermal pad | Preferred for through-hole prototyping or legacy board reuse where VQFN reflow is unavailable | Select when manual soldering, thermal load is light, or footprint compatibility with existing SOIC designs is required |
| SN74AVC245RHLR | Wider VCC range (1.2 V–3.6 V); lower drive (±12 mA); supports 1.2-V I/O domains | Better suited for ultra-low-voltage mobile SoC interfaces, not recommended for 5-V-tolerant legacy systems | Choose only if interfacing with 1.2-V or 1.5-V logic; avoid when 5.5-V input tolerance or 24-mA drive is mandatory |
Compared with SN74LVC245ADW, SN74LVC245AZQNR offers superior thermal performance and smaller footprint but requires reflow assembly; versus SN74AVC245RHLR, it delivers higher drive strength and guaranteed 5.5-V input tolerance at the cost of minimum VCC headroom.
Availability
SN74LVC245AZQNR is available at Aetrix Electronics and suitable for LED displays, network switches, and motor drivers requiring stable component supply across automotive, industrial, and telecom infrastructure programs.
Supply support for SN74LVC245AZQNR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The SN74LVC245A product line targets robust, low-voltage bidirectional bus interfacing - engineered for reliability in mixed-signal systems where voltage translation, hot-swap resilience, and timing predictability are critical.
FAQ
What is the maximum input voltage the SN74LVC245AZQNR can tolerate?
The SN74LVC245AZQNR accepts input voltages up to 5.5 V on all A- and B-port pins, regardless of VCC setting (1.65 V–3.6 V). This overvoltage tolerance is specified in the Recommended Operating Conditions table and enables direct interfacing with 5-V logic without external level-shifting circuitry. The feature is validated across the full –40°C to +125°C temperature range and is integral to its role as a mixed-voltage bus translator.
Does the SN74LVC245AZQNR support hot-plug or live-insertion applications?
Yes, the SN74LVC245AZQNR supports live insertion via its Ioff feature. When VCC = 0 V, the Ioff circuitry actively disables all outputs, preventing damaging back-current flow from powered buses into the unpowered device. This behavior is characterized per JESD 78 and confirmed in the Electrical Characteristics table (Ioff ≤ ±10 µA at VI or VO = 5.5 V), making SN74LVC245AZQNR suitable for modular backplane and hot-swap card applications.
What is the thermal resistance (RθJA) of the SN74LVC245AZQNR in its VQFN package?
The SN74LVC245AZQNR in the RGY (VQFN-20) package has a junction-to-ambient thermal resistance (RθJA) of 44.0°C/W, as specified in the Thermal Information table. This value assumes standard JEDEC 51-5 test conditions with a 1-in² 2-oz copper pad. The low RθJA - significantly better than SOIC or SSOP variants - results from the exposed thermal pad and compact 4.5 mm × 3.5 mm footprint, enabling reliable operation at full drive strength in thermally constrained enclosures.
Can the SN74LVC245AZQNR be used for unidirectional data transfer?
Yes, the SN74LVC245AZQNR can operate unidirectionally by holding the DIR pin at a fixed logic level (high for A→B, low for B→A) while using OE to enable/disable the path. Its functional block diagram and truth table confirm deterministic unidirectional behavior. However, the device's primary design intent is bidirectional communication - for dedicated unidirectional applications, TI offers pin-compatible alternatives like SN74LVC244A (octal buffer) with optimized single-direction timing.
What are the recommended bypass capacitor values for the SN74LVC245AZQNR VCC pin?
Texas Instruments recommends a 0.1-µF ceramic capacitor placed as close as possible to the VCC pin (Pin 20) of the SN74LVC245AZQNR, with low-inductance connection to the GND plane (Pin 10). This value is specified in Section 11 (Power Supply Recommendations) and validated for noise suppression across the 1.65–3.6-V operating range. For systems with multiple VCC sources or high-frequency noise, paralleling a 0.01-µF capacitor may further improve high-frequency decoupling.
SN74LVC245AZQNR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- 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)
SN74LVC245AZQNR FAQ
1.How can I place an order for SN74LVC245AZQNR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC245AZQNR 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 SN74LVC245AZQNR reliable?
The price and inventory of SN74LVC245AZQNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC245AZQNR is usually 5 days.
3.What payment methods are accepted for SN74LVC245AZQNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC245AZQNR transactions.
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4.How is shipping managed for SN74LVC245AZQNR?
SN74LVC245AZQNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC245AZQNR 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 SN74LVC245AZQNR?
For technical support, including SN74LVC245AZQNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC245AZQNR requirements.
6.How does Aetrix verify that SN74LVC245AZQNR is sourced from the original manufacturer or authorized distributors?
All SN74LVC245AZQNR 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 SN74LVC245AZQNR meets industry standards.
7.What is the process for return or replacement of SN74LVC245AZQNR?
All SN74LVC245AZQNR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC245AZQNR, 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 SN74LVC245AZQNR part is unused and in its original packaging.
Return procedure for SN74LVC245AZQNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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