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Texas Instruments SN74LVC245ADBRE4
- Part No.:
- SN74LVC245ADBRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVC245ADBRE4.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,198
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Product details
Overview
SN74LVC245ADBRE4 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 expanders.
For engineers reviewing the SN74LVC245ADBRE4 datasheet, SN74LVC245ADBRE4 pinout, SN74LVC245ADBRE4 application, or SN74LVC245ADBRE4 equivalent, key selection considerations include voltage translation capability (5 V ↔ 3.3 V/1.8 V), 20-pin SSOP package compatibility, 3-state output control via DIR/OE, and thermal performance under industrial temperature range (–40°C to 125°C).
Technical Context
This device implements dual-directional 8-bit data flow controlled by a single DIR input: high enables A→B transmission, low enables B→A. Output enable (OE) independently places all outputs in high-impedance state, enabling bus isolation without affecting internal logic states.
It incorporates Ioff circuitry that disables outputs during partial power-down, preventing current backflow when VCC = 0 V. Inputs tolerate up to 5.5 V regardless of VCC level, supporting robust level-shifting in mixed-voltage systems while maintaining JESD 17 latch-up immunity (>250 mA) and ESD protection (2000-V HBM, 1000-V CDM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports operation across 1.8-V, 2.5-V, and 3.3-V logic domains |
| Max Propagation Delay | 6.3 ns at 3.3 V - enables high-speed inter-bus communication in timing-critical designs |
| Input Voltage Tolerance | Up to 5.5 V - allows direct interfacing with 5-V peripherals without external level shifters |
| Ioff Support | Active at VCC = 0 V - prevents damaging back-current during hot-plug or partial-power-down sequences |
| Output Drive Strength | ±24 mA at 3.0 V - sufficient to drive moderate capacitive loads and longer PCB traces |
| Operating Temperature | –40°C to 125°C - qualified for industrial and telecom infrastructure environments |
| ESD Rating | 2000-V HBM, 1000-V CDM - meets standard reliability requirements for board-level handling |
Pinout & Package
SN74LVC245ADBRE4 uses a 20-pin SSOP (Shrink Small Outline Package) with 0.65-mm lead pitch and body size 7.50 mm × 5.30 mm. Pin numbering follows DB-package top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | High = A→B data flow; Low = B→A data flow - determines real-time bus directionality |
| 2–9 (A1–A8) | Transceiver I/O Port A | Bidirectional data lines connected to source bus (e.g., microcontroller side) |
| 10 (GND) | Ground Reference | Primary return path for all signals and power - must be low-impedance for noise control |
| 11–18 (B1–B8) | Transceiver I/O Port B | Bidirectional data lines connected to destination bus (e.g., peripheral or display interface) |
| 19 (OE) | Output Enable Input | Low = outputs active; High = all outputs in high-impedance - enables bus arbitration and isolation |
| 20 (VCC) | Power Supply | Supplies core logic and I/O buffers - requires local 0.1-μF bypass capacitor per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage translation | Supports 5-V inputs with 3.3-V or 1.8-V VCC - eliminates need for discrete level shifters in heterogeneous systems |
| Live-insertion support | Ioff limits current flow when VCC = 0 V - enables safe hot-swap in modular backplane or docking applications |
| Fast switching performance | 6.3 ns tpd at 3.3 V with 50-pF load - suitable for high-throughput data paths in servers and telecom line cards |
| Robust ESD/latch-up immunity | 2000-V HBM, >250 mA JESD 17 latch-up rating - ensures reliability in manufacturing and field-deployed equipment |
| Controlled output transitions | Typical VOLP < 0.8 V and VOHV > 2 V at 3.3 V - reduces ground bounce and supply undershoot in dense layouts |
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 accepting 5-V scan-line signals. IC Role / Device Role / Timing Role: Bidirectional level translator and bus buffer - isolates controller I/O from higher-voltage display drivers and manages timing-critical strobe/data handshaking. Use Value: Eliminates external voltage translators; supports fast refresh rates due to 6.3 ns propagation delay and ±24 mA drive strength. |
Use Scenario: Extending GPIO count on PLC modules using a 5-V sensor bus while maintaining native 3.3-V MCU compatibility. IC Role / Device Role / Timing Role: Isolated bidirectional I/O expander - enables simultaneous read/write across voltage domains without contention or damage risk. Use Value: Ioff protection prevents backfeed during module replacement; 5.5-V tolerant inputs accept legacy 5-V sensors directly. |
| Network Switch Data Path | Motor Control Logic Interface |
|
Use Scenario: Interfacing packet buffer memory (3.3-V) with MAC-layer logic (5-V) in enterprise Ethernet switch ASIC subsystems. IC Role / Device Role / Timing Role: Asynchronous bus transceiver - synchronizes data transfers between clock domains and absorbs timing skew via 3-state control. Use Value: Low propagation delay and tight skew specs ensure deterministic latency; OE pin enables dynamic bus partitioning during error recovery. |
Use Scenario: Connecting microcontroller PWM outputs to 5-V gate-driver ICs in brushless DC motor controllers. IC Role / Device Role / Timing Role: Direction-controlled signal conditioner - routes control signals bidirectionally while blocking fault feedback during overcurrent events. Use Value: DIR-controlled flow prevents command corruption; high noise immunity (VOLP/VOHV specs) maintains signal integrity near high-dV/dt motor phases. |
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); same electrical specs and pinout as SN74LVC245ADBRE4 | Preferred where board space permits larger footprint and through-hole or manual assembly is required | Select when mechanical robustness and reworkability outweigh compactness needs |
| SN74LVC245APWR | TSSOP-20 package (6.5 mm × 4.4 mm); identical functionality but smaller footprint and finer pitch (0.65 mm vs 0.65 mm same, but thinner profile) | Better suited for space-constrained portable or high-density telecom modules | Choose for miniaturized designs requiring reduced PCB area without sacrificing performance |
Compared with SN74LVC245ADBRE4, the SOIC-20 alternative offers easier handling and thermal mass, while the TSSOP-20 variant saves board area - both retain full functional equivalence, including Ioff, 5.5-V input tolerance, and –40°C to 125°C operation, but differ only in mechanical form factor and thermal resistance (RθJA = 78°C/W for DB vs 83.6°C/W for PW).
Availability
SN74LVC245ADBRE4 is available at Aetrix Electronics and suitable for LED displays, network switches, and industrial I/O expanders requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVC245ADBRE4 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 and embedded processing solutions, with decades of expertise in logic, interface, and power management ICs.
The SN74LVC245A product line was engineered for reliable bidirectional bus interfacing in mixed-voltage systems - targeting industrial automation, communications infrastructure, and embedded computing where voltage translation and bus isolation are critical.
FAQ
What is the maximum operating voltage for inputs on the SN74LVC245ADBRE4?
The SN74LVC245ADBRE4 inputs tolerate up to 5.5 V regardless of VCC level, enabling direct connection to 5-V logic sources even when powered from 1.8-V or 3.3-V supplies. This overvoltage tolerance is specified across the full operating temperature range (–40°C to 125°C) and does not require external clamping components.
Does the SN74LVC245ADBRE4 support hot-swap or live-insertion applications?
Yes, the SN74LVC245ADBRE4 includes Ioff circuitry that disables outputs when VCC = 0 V, preventing damaging current backflow during insertion or removal in powered-backplane systems. This feature is explicitly characterized per JESD 78 and supports safe live insertion in modular telecom and industrial control chassis.
What is the propagation delay of the SN74LVC245ADBRE4 at 3.3 V?
The SN74LVC245ADBRE4 has a maximum propagation delay (tpd) of 6.3 ns at VCC = 3.3 V ± 0.3 V with a 50-pF load and TA = 25°C. Typical values are lower (3.8 ns), and performance remains within specification across –40°C to 125°C, making it suitable for high-speed data routing in servers and networking gear.
How does the DIR pin control data flow direction in the SN74LVC245ADBRE4?
In the SN74LVC245ADBRE4, the DIR pin determines real-time bus direction: when DIR = HIGH, data flows from port A to port B; when DIR = LOW, data flows from port B to port A. This asynchronous control operates independently of OE, allowing dynamic reversal without disrupting 3-state isolation.
Can the SN74LVC245ADBRE4 be used as a level shifter between 5-V and 3.3-V systems?
Yes, the SN74LVC245ADBRE4 is explicitly designed for mixed-mode operation: its 5.5-V input tolerance and 1.65–3.6-V VCC range allow seamless 5-V-to-3.3-V down-translation. TI's datasheet confirms this use case in Feature Description and Typical Application sections, with no additional components required.
SN74LVC245ADBRE4 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
SN74LVC245ADBRE4 FAQ
1.How can I place an order for SN74LVC245ADBRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC245ADBRE4 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 SN74LVC245ADBRE4 reliable?
The price and inventory of SN74LVC245ADBRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC245ADBRE4 is usually 5 days.
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SN74LVC245ADBRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC245ADBRE4 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 SN74LVC245ADBRE4?
For technical support, including SN74LVC245ADBRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC245ADBRE4 requirements.
6.How does Aetrix verify that SN74LVC245ADBRE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC245ADBRE4 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 SN74LVC245ADBRE4 meets industry standards.
7.What is the process for return or replacement of SN74LVC245ADBRE4?
All SN74LVC245ADBRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC245ADBRE4, 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 SN74LVC245ADBRE4 part is unused and in its original packaging.
Return procedure for SN74LVC245ADBRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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