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Texas Instruments SN74LVC245AGQNR
- Part No.:
- SN74LVC245AGQNR
- Manufacturer:
- Texas Instruments
- Package:
- 20-VFBGA
- Datasheet:
-
SN74LVC245AGQNR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20BGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,366
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Product details
Overview
SN74LVC245AGQNR 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), delivers 6.3 ns max propagation delay at 3.3 V, and features Ioff for live insertion and back-drive protection - used in LED displays, network switches, and I/O expansion interfaces.
For engineers reviewing the SN74LVC245AGQNR datasheet, SN74LVC245AGQNR pinout, SN74LVC245AGQNR application, or SN74LVC245AGQNR equivalent, key selection criteria include voltage translation capability (5 V ↔ 3.3 V/1.8 V), 3-state output isolation timing (ten/tdis), thermal performance in VQFN-20, and Ioff-enabled partial-power-down robustness in mixed-voltage systems.
Technical Context
The SN74LVC245AGQNR implements dual-directional 8-bit data flow controlled by DIR (direction) and OE (output enable) logic inputs. Its CMOS design enables overvoltage-tolerant inputs up to 5.5 V while operating from 1.65 V to 3.6 V VCC, allowing seamless level translation across 1.8 V, 2.5 V, 3.3 V, and legacy 5 V domains. The device uses standard TTL-compatible thresholds and supports simultaneous switching of all eight channels.
Functional modes are defined strictly by OE and DIR states: when OE = L, data flows A→B (DIR = H) or B→A (DIR = L); when OE = H, all outputs enter high-impedance isolation. Ioff circuitry actively disables outputs during power-down, blocking reverse current even if VCC = 0 V and I/O pins are driven externally.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - Enables interoperability across 1.8 V, 2.5 V, and 3.3 V logic domains without external level shifters. |
| Input Voltage Max | 5.5 V - Allows direct connection to 5 V microcontrollers or peripherals while powered from 3.3 V or lower. |
| tpd (Max) | 6.3 ns at VCC = 3.3 V - Supports high-speed bus communication up to ~80 MHz clock-equivalent rates with margin. |
| Ioff Current | ±20 μA at VI/VO = 5.5 V - Ensures safe hot-plug operation and prevents back-drive damage during system power sequencing. |
| Output Drive | ±24 mA at VCC = 3.0 V - Drives moderate capacitive loads (e.g., 15–20 cm PCB traces) without external buffers. |
| ESD Rating | 2000 V HBM, 1000 V CDM - Meets industrial-grade ESD immunity requirements per JESD22 standards. |
| Operating Temp | –40°C to +125°C - Qualified for automotive under-hood, industrial control, and telecom infrastructure environments. |
Pinout & Package
VQFN-20 package (RGY), 4.50 mm × 3.50 mm body, 0.5 mm pitch, exposed thermal pad - optimized for compact PCB layouts 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 direction without latch or clock. |
| 19 (OE) | Output enable input | Low = outputs active; High = all A/B ports enter high-Z state - critical for bus arbitration and multi-master isolation. |
| A1–A8 (Pins 2–9) | Transceiver I/O port A | Bidirectional data lines tied to one bus segment; tolerate 5.5 V regardless of VCC setting. |
| B1–B8 (Pins 11–18) | Transceiver I/O port B | Bidirectional data lines tied to second bus segment; electrically isolated from Port A when OE = H. |
| 10 (GND) | Ground reference | Primary return path for all I/O and internal logic; must be low-inductance connection to minimize ground bounce. |
| 20 (VCC) | Power supply | Supplies core logic and output drivers; requires local 0.1 μF bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode I/O | Accepts 0–5.5 V inputs at any valid VCC (1.65–3.6 V), enabling direct interfacing between 5 V legacy systems and modern low-voltage MCUs. |
| Ioff partial-power-down | Disables outputs and blocks current flow when VCC = 0 V, permitting safe insertion/removal in live backplanes or modular systems. |
| Low ground bounce | Typical VOLP < 0.8 V at VCC = 3.3 V - reduces noise coupling into sensitive analog sections during heavy switching. |
| Fast edge control | Δt/Δv ≤ 10 ns/V ensures clean signal integrity on long traces; avoids excessive ringing without external series termination. |
| Latch-up immunity | Exceeds 250 mA per JESD17 - guarantees robust operation under transient overvoltage or ESD stress conditions. |
Applications
| LED Display Driver Interface | Industrial I/O Expander |
|---|---|
Use Scenario: Driving multiplexed 7-segment or dot-matrix LED panels from a 3.3 V microcontroller while sourcing sink current through 5 V constant-current drivers. IC Role / Device Role / Timing Role: Bidirectional level translator and bus isolator - routes scan data from MCU to display controller and feedback status from panel sensors. Use Value: Eliminates discrete level-shifting ICs; leverages 5.5 V input tolerance to accept panel-side status signals directly without pull-up resistors. | Use Scenario: Extending GPIO count of a PLC CPU module to interface with 24 V digital sensors and actuators via optocoupled inputs/outputs. IC Role / Device Role / Timing Role: Isolated bidirectional data bridge between low-voltage logic and field-side interface ASICs - enables hot-swap capability during maintenance. Use Value: Ioff protection prevents back-driving of powered-down CPU during module replacement; 125°C rating supports enclosure mounting near power supplies. |
| Network Switch Data Path | Motor Control Feedback Hub |
Use Scenario: Interfacing between 3.3 V packet processor ASIC and 5 V PHY management registers in enterprise Ethernet switch line cards. IC Role / Device Role / Timing Role: Synchronous register-access transceiver - transfers MDIO/MDC configuration data bidirectionally with sub-7 ns timing margin. Use Value: 6.3 ns tpd ensures setup/hold compliance at 25 MHz MDIO clock; 3-state outputs prevent bus contention during PHY reset sequences. | Use Scenario: Aggregating Hall-effect sensor signals and PWM command lines between 1.8 V motor driver IC and 3.3 V motion controller in servo drives. IC Role / Device Role / Timing Role: Voltage-domain firewall and signal conditioner - translates position feedback while blocking ground-loop noise from power stage. Use Value: Input overvoltage tolerance accepts 5 V Hall sensor outputs; low VOLP minimizes jitter in commutation timing critical for <1% torque ripple. |
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 V–3.6 V); faster tpd (3.2 ns @ 1.8 V); no 5.5 V input tolerance. | Better suited for ultra-low-voltage SoC interconnects; incompatible with 5 V signal sources. | Select when interfacing 1.2 V/1.8 V cores only and maximum speed >6 ns is required. |
| 74LVC245ABQ | Same electrical specs; offered in 20-pin TSSOP (PW) instead of VQFN (RGY); larger footprint (6.5 × 4.4 mm). | Preferred for manual assembly or prototyping where QFN reflow is unavailable; higher thermal resistance (RθJA = 83.6°C/W vs. 44.0°C/W). | Select when board assembly process lacks QFN reflow capability or thermal budget allows higher junction temperature. |
Compared with SN74AVC245RHLR and 74LVC245ABQ, the SN74LVC245AGQNR uniquely balances 5 V input compatibility, VQFN thermal efficiency, and industrial temperature support - making it optimal for mixed-voltage embedded systems requiring reliability over raw speed or ease of hand-soldering.
Availability
SN74LVC245AGQNR is available at Aetrix Electronics and suitable for LED displays, industrial I/O expanders, and network switch data paths requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SN74LVC245AGQNR 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 communications markets.
The SN74LVC245A product line targets robust, low-voltage bidirectional bus interfacing in mixed-signal systems - designed specifically for voltage translation, hot-swap safety, and noise-immune data routing in harsh environments.
FAQ
What voltage levels can SN74LVC245AGQNR safely translate?
The SN74LVC245AGQNR accepts input voltages up to 5.5 V on all A and B pins regardless of VCC setting (1.65 V–3.6 V), enabling reliable 5 V-to-3.3 V, 5 V-to-1.8 V, and 3.3 V-to-1.8 V bidirectional translation. Its output VOH/VOL specs are referenced to VCC, so translated levels match the local bus domain - confirmed in TI's SCAS218X datasheet Section 7.5.
Does SN74LVC245AGQNR support hot-plug insertion?
Yes, SN74LVC245AGQNR supports live insertion via its Ioff feature: when VCC = 0 V, all I/O pins enter high-impedance state with leakage < ±20 μA, preventing damaging back-current from powered buses. This is validated per JESD78 and documented in Section 9.3 of the SN74LVC245A datasheet.
What is the thermal performance of SN74LVC245AGQNR in its VQFN package?
SN74LVC245AGQNR in RGY (VQFN-20) package has RθJA = 44.0°C/W, RθJC(top) = 3.0°C/W, and RθJB = 22.1°C/W - significantly better than SOIC or TSSOP variants. This enables higher sustained drive current in thermally constrained designs, as verified in Section 7.4 of the official datasheet.
How does SN74LVC245AGQNR handle bus contention during direction switching?
SN74LVC245AGQNR avoids bus contention by enforcing strict functional mode control: data flow direction changes only when OE = L, and DIR transitions occur asynchronously with no internal latching. The device does not incorporate bus-hold or auto-isolation - proper system-level timing (ensuring OE = H during DIR changes) is required, per Table 1 in Section 9.4.
Is SN74LVC245AGQNR pin-compatible with other SN74LVC245A variants?
Yes, SN74LVC245AGQNR shares identical pinout and function mapping with all SN74LVC245A family members (e.g., DB, PW, RGY packages), as confirmed in Section 6 "Pin Configuration and Functions" of the datasheet. Pin 1 = DIR, Pin 19 = OE, Pins 2–9 = A1–A8, Pins 11–18 = B1–B8, Pin 10 = GND, Pin 20 = VCC - consistent across all 20-pin variants.
SN74LVC245AGQNR 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)
SN74LVC245AGQNR FAQ
1.How can I place an order for SN74LVC245AGQNR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC245AGQNR 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 SN74LVC245AGQNR reliable?
The price and inventory of SN74LVC245AGQNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC245AGQNR is usually 5 days.
3.What payment methods are accepted for SN74LVC245AGQNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC245AGQNR transactions.
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4.How is shipping managed for SN74LVC245AGQNR?
SN74LVC245AGQNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC245AGQNR 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 SN74LVC245AGQNR?
For technical support, including SN74LVC245AGQNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC245AGQNR requirements.
6.How does Aetrix verify that SN74LVC245AGQNR is sourced from the original manufacturer or authorized distributors?
All SN74LVC245AGQNR 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 SN74LVC245AGQNR meets industry standards.
7.What is the process for return or replacement of SN74LVC245AGQNR?
All SN74LVC245AGQNR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC245AGQNR, 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 SN74LVC245AGQNR part is unused and in its original packaging.
Return procedure for SN74LVC245AGQNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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