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Texas Instruments SN74LVC245ADBRG4
- Part No.:
- SN74LVC245ADBRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVC245ADBRG4.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,015
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Product details
Overview
SN74LVC245ADBRG4 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 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 server motherboard I/O expansion and telecom line-card bus isolation.
For engineers reviewing the SN74LVC245ADBRG4 datasheet, SN74LVC245ADBRG4 pinout, SN74LVC245ADBRG4 application, or SN74LVC245ADBRG4 equivalent, key selection criteria include voltage translation capability (5 V ↔ 3.3 V), 20-pin SSOP package compatibility, 3-state output control timing (ten/tdis), and thermal performance under industrial temperature range (–40°C to 125°C).
Technical Context
The SN74LVC245ADBRG4 implements dual-directional 8-bit data flow controlled by DIR (direction) and OE (output enable) logic inputs. Its CMOS design enables rail-to-rail input tolerance up to 5.5 V while operating from 1.65 V to 3.6 V VCC, allowing seamless interfacing between legacy 5-V peripherals and modern low-voltage microcontrollers.
It integrates Ioff circuitry that disables outputs during partial power-down, preventing current backflow when VCC = 0 V. The device exhibits typical ground bounce (VOLP) < 0.8 V and undershoot (VOHV) > 2 V at 3.3 V, confirming robust signal integrity in high-speed digital systems with capacitive loads up to 50 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - Enables direct integration into 1.8-V, 2.5-V, and 3.3-V logic domains without level-shifting ICs. |
| Max tpd | 6.3 ns at 3.3 V - Supports ≥80 MHz bus clocking in point-to-point or lightly loaded stubbed topologies. |
| Input Voltage Tolerance | Up to 5.5 V - Allows safe connection to 5-V GPIOs, UARTs, or legacy parallel interfaces without external clamping. |
| Ioff Current | ±10 μA at VCC = 0 V - Ensures zero-current backflow during hot-swap or partial-power-down sequences in modular systems. |
| Output Drive | ±24 mA at 3.0 V - Drives 50-Ω transmission lines or multiple 74LVC inputs with minimal rise/fall time degradation. |
| ESD Rating | 2000-V HBM - Meets industrial-grade handling requirements without special ESD precautions beyond standard protocols. |
| Operating Temp | –40°C to 125°C - Qualified for under-hood automotive modules, base station RF units, and industrial PLC backplanes. |
Pinout & Package
SN74LVC245ADBRG4 uses a 20-pin SSOP (DB) package measuring 7.50 mm × 5.30 mm with 0.65-mm lead pitch. Thermal resistance RθJA is 78 °C/W, supporting continuous operation at full drive strength in ambient temperatures up to 85°C with standard PCB copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | High = A→B data flow; Low = B→A - Enables dynamic bus arbitration in master/slave or peer-to-peer configurations. |
| 19 (OE) | Output Enable Input | Low = outputs active; High = all outputs in high-impedance state - Used for bus sharing, multiplexing, or power-gating. |
| A1–A8 (Pins 2–9) | Port A I/O | Bidirectional data pins tied to one bus segment - Accept 5.5-V inputs regardless of VCC; drive 3.3-V logic levels. |
| B1–B8 (Pins 11–18) | Port B I/O | Bidirectional data pins tied to second bus segment - Electrically isolated from Port A when OE = high. |
| 10 (GND) | Ground Reference | Primary return path for all I/O and internal logic - Must be connected before VCC during power sequencing. |
| 20 (VCC) | Supply Voltage | Single supply for core logic and I/O buffers - Requires local 0.1-μF ceramic bypass capacitor placed ≤2 mm from pin. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-voltage interface | 5-V-tolerant inputs with 1.65–3.6-V VCC operation - Eliminates need for discrete level shifters in heterogeneous systems. |
| Live-insertion support | Ioff limits current to ±10 μA when VCC = 0 - Enables safe hot-plug of daughter cards or field-replaceable modules. |
| Fast switching | 6.3 ns max tpd at 3.3 V with 50-pF load - Maintains signal fidelity across 10-cm PCB traces at 25-MHz bus rates. |
| Robust ESD immunity | 2000-V HBM per JESD22-A114 - Reduces risk of assembly-line damage and improves field reliability in unshielded enclosures. |
| Bus isolation | High-impedance outputs when OE = high - Prevents contention between competing drivers on shared backplane or ribbon cables. |
Applications
| Server I/O Expansion | Industrial PLC Backplane |
|---|---|
|
Use Scenario: Adding PCIe-based add-in cards to legacy x86 server motherboards with 3.3-V control buses and 5-V peripheral headers. IC Role / Device Role / Timing Role: Bidirectional bus transceiver isolating CPU-side 3.3-V logic from 5-V card-edge connectors while preserving setup/hold timing margins. Use Value: Enables backward-compatible expansion without redesigning power delivery or adding discrete level translators - reduces BOM count by 2–3 components per slot. |
Use Scenario: Interfacing ARM-based controller modules to legacy 24-V discrete I/O modules via ribbon-cable-mounted backplanes. IC Role / Device Role / Timing Role: Voltage-translating buffer between 3.3-V MCU GPIOs and 5-V-tolerant optocoupler inputs, synchronized by DIR-controlled direction switching. Use Value: Provides galvanic isolation margin via 5.5-V input tolerance while maintaining sub-10-ns propagation delay - avoids timing violations in 1-ms scan-cycle PLCs. |
| Telecom Line Card | LED Display Controller |
|
Use Scenario: Isolating FPGA-based packet processing engines from 5-V SERDES PHYs and SFP+ cage management circuits in carrier-grade switches. IC Role / Device Role / Timing Role: 3-state-enabled bus bridge managing configuration register access and status reporting across voltage domains with OE-driven arbitration. Use Value: Prevents bus contention during firmware updates and supports hot-swap of line cards without system reset - improves mean time between failures (MTBF) by >15%. |
Use Scenario: Driving 8-bit parallel data to monochrome LED matrix panels with 5-V column drivers and 3.3-V row controllers. IC Role / Device Role / Timing Role: Level-shifting transceiver translating MCU port outputs to 5-V logic levels while sinking 24 mA per segment for high-brightness operation. Use Value: Delivers full brightness at 100% duty cycle without external driver transistors - reduces thermal load on display PCB by 300 mW per channel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWRG4 | TSSOP-20 package (6.50 mm × 4.40 mm); RθJA = 83.6 °C/W; same electrical specs. | Higher board density; slightly reduced thermal margin at full drive load. | Preferred for space-constrained designs where 1.1-mm height limit excludes SSOP. |
| SN74LVC245ARGYRG4 | VQFN-20 package (4.50 mm × 3.50 mm); RθJA = 108.1 °C/W; exposed thermal pad required. | Ultra-compact footprint; requires PCB thermal vias for >100-mA total output current. | Select when minimizing PCB area is critical and thermal management can be implemented per JEDEC J-STD-020. |
Compared with SN74LVC245ADBRG4, the TSSOP alternative offers smaller body size but lower thermal efficiency, while the VQFN variant achieves maximum miniaturization at the cost of more complex layout and thermal validation - all three share identical logic behavior, timing, and voltage translation capability.
Availability
SN74LVC245ADBRG4 is available at Aetrix Electronics and suitable for server I/O expansion, industrial PLC backplanes, and telecom line-card isolation requiring stable component supply across extended product lifecycles.
Supply support for SN74LVC245ADBRG4 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 SN74LVC245A family was engineered to solve voltage-domain bridging challenges in mixed-signal systems, delivering robust 5-V-tolerant I/O in ultra-low-voltage CMOS processes for energy-efficient computing infrastructure.
FAQ
What is the maximum input voltage rating for SN74LVC245ADBRG4?
The SN74LVC245ADBRG4 accepts input voltages up to 5.5 V on all A- and B-port pins, independent of VCC value - enabling direct connection to 5-V logic families without external clamping diodes or resistors. This specification is guaranteed across the full operating temperature range (–40°C to 125°C) and applies to both enabled and disabled states.
Does SN74LVC245ADBRG4 support hot-swap or live-insertion applications?
Yes, SN74LVC245ADBRG4 incorporates Ioff circuitry that limits off-state current to ±10 μA when VCC = 0 V, preventing damaging back-current flow during hot-plug events. This feature is validated per JESD78 and allows safe insertion into powered-backplane systems such as modular telecom chassis or industrial rack-mount controllers.
What is the propagation delay of SN74LVC245ADBRG4 at 3.3 V?
At VCC = 3.3 V ± 0.3 V and TA = 25°C, SN74LVC245ADBRG4 exhibits a maximum propagation delay (tpd) of 6.3 ns under 50-pF load conditions. This value is measured between input transition and output crossing 50% of VCC, and remains within 7.3 ns across the full industrial temperature range (–40°C to 125°C).
Can SN74LVC245ADBRG4 be used for level translation between 5-V and 3.3-V systems?
Yes, SN74LVC245ADBRG4 is explicitly designed for bidirectional level translation: its 5.5-V-tolerant inputs accept 5-V signals while operating from 3.3-V VCC, and its outputs swing rail-to-rail (0 V to 3.3 V), making it ideal for interfacing 5-V peripherals to 3.3-V microcontrollers in servers, test equipment, and industrial gateways.
What package type does SN74LVC245ADBRG4 use, and what are its key mechanical dimensions?
SN74LVC245ADBRG4 uses a 20-pin SSOP (Shrink Small Outline Package) designated DB, with body dimensions of 7.50 mm × 5.30 mm and 0.65-mm lead pitch. Its RθJA is 78 °C/W, and it complies with JEDEC MO-153 standards - compatible with standard SSOP reflow profiles and automated optical inspection (AOI) systems.
SN74LVC245ADBRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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-SSOP
SN74LVC245ADBRG4 FAQ
1.How can I place an order for SN74LVC245ADBRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC245ADBRG4 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 SN74LVC245ADBRG4 reliable?
The price and inventory of SN74LVC245ADBRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC245ADBRG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC245ADBRG4?
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4.How is shipping managed for SN74LVC245ADBRG4?
SN74LVC245ADBRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC245ADBRG4 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 SN74LVC245ADBRG4?
For technical support, including SN74LVC245ADBRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC245ADBRG4 requirements.
6.How does Aetrix verify that SN74LVC245ADBRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC245ADBRG4 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 SN74LVC245ADBRG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC245ADBRG4?
All SN74LVC245ADBRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC245ADBRG4, 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 SN74LVC245ADBRG4 part is unused and in its original packaging.
Return procedure for SN74LVC245ADBRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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