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Texas Instruments SN74LV245ADWR
- Part No.:
- SN74LV245ADWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LV245ADWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,655
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Product details
Overview
SN74LV245ADWR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between voltage-domain-isolated buses. It operates from 2 V to 5.5 V, delivers 6.5 ns maximum propagation delay at 5 V, supports mixed-mode voltage translation (e.g., 5 V → 3.3 V), and features Ioff for partial-power-down protection. It is used in server backplanes and telecom infrastructure where level-shifting isolation and low-noise bus driving are required.
For engineers reviewing the SN74LV245ADWR datasheet, SN74LV245ADWR pinout, SN74LV245ADWR application, or SN74LV245ADWR equivalent, key selection criteria include its 20-pin SOIC (DW) package, 3-state control via DIR/OE, guaranteed 35 mA output drive per pin, and JESD 17 latch-up immunity exceeding 250 mA - all critical for robust industrial bus interface design.
Technical Context
The SN74LV245ADWR implements a dual-bus, direction-controlled transceiver architecture with independent A- and B-side I/O ports. Its DIR input selects data flow direction (A→B or B→A), while OE enables or disables all outputs into high-impedance state. The device uses CMOS logic with balanced drive strength and intentionally slow edge rates to suppress output ringing and ground bounce.
It supports true mixed-voltage operation: inputs tolerate up to 5.5 V regardless of VCC, enabling down-translation (e.g., 5 V microcontroller to 3.3 V FPGA). Ioff circuitry actively disables outputs during power-down, blocking reverse current flow and protecting powered-down subsystems - essential for hot-swap and partial-power-down systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - enables interoperability across 2.5 V, 3.3 V, and 5 V logic domains without external level shifters. |
| tpd (max) | 6.5 ns at VCC = 5 V, CL = 15 pF - ensures sub-150 MHz bus timing margin for high-speed parallel interfaces. |
| Ioff Current | <5 µA at VCC = 0 V - prevents damaging back-current when one bus is powered and the other is not. |
| Output Drive | ±35 mA per pin - sufficient to drive standard 50 Ω transmission lines or multiple CMOS loads without external buffers. |
| ESD Rating | 2000 V HBM - meets industrial-grade ESD robustness requirements for board-level handling and field deployment. |
| Operating Temp | –40°C to +125°C - qualified for extended temperature operation in telecom and automotive under-hood applications. |
Pinout & Package
SN74LV245ADWR is packaged in a 20-pin SOIC (DW) with 12.80 mm × 7.50 mm body size and 1.27 mm lead pitch. The package is RoHS-compliant, lead-finished with NiPdAu, and rated MSL Level-1 (260°C, unlimited reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | High = A→B data flow; Low = B→A - enables full-duplex bus arbitration without external logic. |
| A1–A8 (Pins 2–9) | Port A I/O terminals | Bidirectional data pins tied to one bus segment; tolerate 5.5 V inputs at any VCC. |
| GND (Pin 10) | Ground reference | Primary return path for all I/O and supply currents; must be low-inductance connection. |
| B8–B1 (Pins 11–18) | Port B I/O terminals | Complementary bidirectional port for second bus; electrically isolated from Port A when OE is high. |
| OE (Pin 19) | Output enable input | Active-low - asserts high-impedance on both ports simultaneously for bus isolation or multiplexing. |
| VCC (Pin 20) | Power supply | Single-supply rail powering internal logic and output drivers; requires local 0.1 µF bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage translation | Accepts 0–5.5 V inputs at any VCC (2–5.5 V), enabling reliable 5 V → 3.3 V down-translation without external components. |
| Ioff partial-power-down protection | Blocks current flow between powered and unpowered buses, preventing damage during hot-plug or staggered power sequencing. |
| Low-noise output drive | Slow edge rates and <0.8 V ground bounce (VOLP) at 3.3 V reduce EMI and signal integrity issues in dense PCB layouts. |
| 3-state bus isolation | Simultaneous high-Z on all 16 I/Os via single OE pin - simplifies bus arbitration and eliminates contention in multi-master systems. |
| JESD 17 latch-up immunity | Exceeds 250 mA - ensures robust operation in noisy industrial environments with transient voltage coupling. |
Applications
| Server Backplane Interface | LED Display Controller Bus |
|---|---|
|
Use Scenario: Isolating and translating control signals between a 5 V management MCU and a 3.3 V FPGA-based display timing controller in modular LED video walls. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing address/data strobes and sync signals across voltage domains. Use Value: Eliminates discrete level shifters and reduces BOM count while maintaining 6.5 ns timing integrity for pixel clock distribution. |
Use Scenario: Driving column driver ICs from a microcontroller in outdoor LED signage, where EMI and ground bounce must be minimized. IC Role / Device Role / Timing Role: Low-noise octal buffer isolating MCU GPIOs from capacitive LED column loads. Use Value: VOLP <0.8 V and controlled edge rates prevent ghosting and false triggering in high-density LED arrays. |
| Network Switch ASIC Interface | Industrial I/O Expander Hub |
|
Use Scenario: Interfacing a 3.3 V switch fabric ASIC with legacy 5 V PHY modules in enterprise Ethernet switches. IC Role / Device Role / Timing Role: Direction-controlled bus transceiver synchronizing configuration registers and status reporting. Use Value: Supports hot-swap insertion via Ioff, allowing PHY replacement without powering down the entire switch fabric. |
Use Scenario: Extending GPIO count of a PLC CPU to drive relays, sensors, and indicators across multiple voltage rails. IC Role / Device Role / Timing Role: Isolated bidirectional data conduit between CPU bus and remote I/O modules. Use Value: ±35 mA per pin drives 24 V relay coils directly; OE pin enables dynamic bus segmentation for fault containment. |
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 | Lower VCC range (1.65–3.6 V); faster tpd (5.3 ns @ 3.3 V); no 5.5 V input tolerance. | Restricted to 3.3 V-only systems; unsuitable for 5 V ↔ 3.3 V translation. | Select SN74LVC245A only if operating exclusively at 3.3 V and higher speed is prioritized over voltage flexibility. |
| 74ALVC245 | Wider VCC (1.65–3.6 V); higher drive (±24 mA); lower ICC (10 µA); no Ioff support. | Lacks partial-power-down capability; not suitable for hot-swap or mixed-rail power sequencing. | Choose 74ALVC245 for ultra-low static power in battery-powered 3.3 V systems where Ioff is unnecessary. |
Compared with SN74LVC245A and 74ALVC245, the SN74LV245ADWR uniquely combines 5.5 V input tolerance, Ioff-enabled safe power-down, and industrial temperature range - making it the only option among the three qualified for mixed-voltage, hot-pluggable, and extended-temp embedded bus interfaces.
Availability
SN74LV245ADWR is available at Aetrix Electronics and suitable for server backplanes, LED display controllers, network switch ASIC interfaces, industrial I/O expanders, and telecom infrastructure requiring stable component supply and long-term manufacturability.
Supply support for SN74LV245ADWR 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 expertise in logic interface solutions.
The SN74LV245ADWR belongs to TI's LV (Low-Voltage) logic family, engineered for robust mixed-voltage bus interfacing in industrial, telecom, and computing applications demanding wide VCC range and power-down safety.
FAQ
What is the maximum propagation delay of the SN74LV245ADWR at 5 V?
The SN74LV245ADWR has a maximum propagation delay (tpd) of 6.5 ns at VCC = 5 V, CL = 15 pF, and TA = 25°C. This value is specified across the full operating temperature range (–40°C to +125°C) and ensures timing predictability in high-speed parallel bus designs. The SN74LV245ADWR maintains consistent performance due to its optimized CMOS process and controlled output slew rates.
Does the SN74LV245ADWR support 5 V to 3.3 V level translation?
Yes, the SN74LV245ADWR supports bidirectional 5 V to 3.3 V level translation. Its inputs tolerate voltages up to 5.5 V regardless of VCC setting, allowing a 5 V controller to safely drive the A-port while the device is powered at 3.3 V. The SN74LV245ADWR outputs then drive the B-port at 3.3 V logic levels - verified by VIH/VIL thresholds and VOH/VOL specs across VCC = 3.3 V.
What is the purpose of the Ioff feature in the SN74LV245ADWR?
The Ioff feature in the SN74LV245ADWR disables all outputs and blocks current flow when VCC = 0 V, preventing damaging back-current from powered buses into unpowered sections. This enables safe partial-power-down and hot-swap operation. For the SN74LV245ADWR, Ioff is guaranteed ≤5 µA across –40°C to +125°C, meeting JESD 78 requirements for system-level power sequencing robustness.
Can the SN74LV245ADWR be used in industrial temperature applications?
Yes, the SN74LV245ADWR is fully specified for operation from –40°C to +125°C ambient temperature, qualifying it for industrial, automotive under-hood, and telecom infrastructure use. Its electrical characteristics - including tpd, VOL/VOH, and Ioff - are guaranteed across this full range, and the SOIC (DW) package is rated for MSL Level-1 reflow compatibility, supporting high-reliability manufacturing.
How does the SN74LV245ADWR minimize ground bounce and output ringing?
The SN74LV245ADWR minimizes ground bounce (VOLP <0.8 V at 3.3 V) and output ringing through intentionally slower edge rates and balanced output drive strength. Its Δt/Δv specification (20 ns/V at 5 V) limits slew rate, reducing high-frequency harmonics. These design choices - confirmed in the SN74LV245ADWR noise characterization data - make it suitable for EMI-sensitive LED displays and high-density backplanes.
SN74LV245ADWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 16mA, 16mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74LV245ADWR FAQ
1.How can I place an order for SN74LV245ADWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV245ADWR 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 SN74LV245ADWR reliable?
The price and inventory of SN74LV245ADWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV245ADWR is usually 5 days.
3.What payment methods are accepted for SN74LV245ADWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV245ADWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV245ADWR?
SN74LV245ADWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV245ADWR 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 SN74LV245ADWR?
For technical support, including SN74LV245ADWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV245ADWR requirements.
6.How does Aetrix verify that SN74LV245ADWR is sourced from the original manufacturer or authorized distributors?
All SN74LV245ADWR 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 SN74LV245ADWR meets industry standards.
7.What is the process for return or replacement of SN74LV245ADWR?
All SN74LV245ADWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV245ADWR, 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 SN74LV245ADWR part is unused and in its original packaging.
Return procedure for SN74LV245ADWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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