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Texas Instruments SN74LV245ADBR
- Part No.:
- SN74LV245ADBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LV245ADBR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,952
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Product details
Overview
SN74LV245ADBR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between voltage domains. 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 isolation. It is used in server backplanes and LED display controllers where bus contention avoidance and ground-bounce control are critical.
For engineers reviewing the SN74LV245ADBR datasheet, SN74LV245ADBR pinout, SN74LV245ADBR application, or SN74LV245ADBR equivalent, key selection criteria include its 20-pin SSOP (DB) package, direction-controlled bidirectional flow, 3-state output enable timing (ten/tdis), and Ioff-enabled power-down safety in hot-swap systems.
Technical Context
The SN74LV245ADBR implements a dual-bus transceiver architecture with DIR-controlled signal directionality and OE-gated 3-state output control. Its logic diagram shows symmetrical A↔B port buffering with independent input thresholds tolerant up to 5.5 V regardless of VCC level.
It uses low-drive CMOS output stages with intentionally slow edge rates (20–200 ns/V input transition rate dependence) to suppress ringing and undershoot/overshoot-verified by typical VOLP < 0.8 V and VOHV > 2.3 V at 3.3 V. Ioff circuitry actively disables outputs during VCC = 0, preventing back-current flow.
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 level shifters |
| tpd (max) | 6.5 ns at VCC = 5 V, CL = 15 pF - ensures sub-150 MHz bus operation with timing margin |
| Ioff Current | ≤5 µA at VCC = 0 - guarantees safe isolation during partial power-down or hot insertion |
| VIH/VIL Thresholds | VCC × 0.7 / VCC × 0.3 - provides noise-immune switching with hysteresis-like robustness |
| ESD Rating | 2000-V HBM - meets industrial-grade handling requirements without external protection |
| Output Drive | ±16 mA at VCC = 5 V - sufficient for driving 50-pF loads across PCB traces or multiple CMOS inputs |
| Thermal Resistance | RθJA = 113.1 °C/W (DB package) - defines derating curve for continuous 70 mA total output current |
Pinout & Package
SN74LV245ADBR is packaged in a 20-pin SSOP (DB) with 0.65 mm pitch, body size 7.20 mm × 5.30 mm, and exposed pad omitted. Pin 1 is located in quadrant Q1 per tape-and-reel standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | Low = B→A data flow; High = A→B data flow - determines real-time bus arbitration path |
| OE (Pin 19) | Output enable input | Low = active transceiver; High = high-impedance isolation - critical for bus sharing and power sequencing |
| A1–A8 (Pins 2–9) | Port A I/O terminals | Bidirectional data lines tied to one bus segment; tolerate up to 5.5 V regardless of VCC |
| B1–B8 (Pins 11–18) | Port B I/O terminals | Bidirectional data lines tied to second bus segment; electrically isolated when OE = high |
| VCC (Pin 20) | Power supply | Supplies internal logic and output drivers; requires local 0.1 µF bypass capacitor |
| GND (Pin 10) | Ground reference | Return path for all I/O and supply currents; must be low-inductance connection to minimize ground bounce |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage translation | Accepts 0–5.5 V inputs at any VCC (2–5.5 V), enabling direct 5 V-to-3.3 V down-translation without external components |
| Ioff partial-power-down support | Blocks current flow when VCC = 0, allowing safe insertion/removal in live backplanes and modular systems |
| Controlled edge rates | Input transition rate limits (20–200 ns/V) reduce EMI and eliminate overshoot on unterminated traces |
| High-impedance state control | OE-driven 3-state outputs provide deterministic bus isolation with <1 ns disable skew across all 16 lines |
| Robust ESD immunity | 2000-V HBM rating eliminates need for discrete TVS diodes in most industrial enclosure environments |
Applications
| Server Backplane Interfacing | LED Display Column Drivers |
|---|---|
Use Scenario: Isolating CPU/memory subsystems from PCIe expansion slots during hot-plug events. IC Role / Device Role / Timing Role: Bidirectional data buffer with OE-synchronized isolation and DIR-controlled lane routing. Use Value: Prevents bus contention during slot insertion; Ioff blocks backfeed into powered-down modules. | Use Scenario: Driving multiplexed column lines in high-density indoor LED video walls. IC Role / Device Role / Timing Role: Level-translating bus repeater between 3.3 V FPGA controller and 5 V LED driver ICs. Use Value: Enables mixed-voltage operation without external level shifters; slow edges suppress pixel ghosting. |
| Industrial Network Switch Fabric | Motor Driver I/O Expansion |
Use Scenario: Buffering control signals between ASIC-based switch fabric and PHY management interfaces. IC Role / Device Role / Timing Role: Low-noise, 3-state transceiver ensuring clean signal integrity across 10+ cm PCB runs. Use Value: VOLP < 0.8 V and VOHV > 2.3 V prevent false triggering in noisy factory environments. | Use Scenario: Expanding GPIO count from microcontroller to drive stepper motor phase enable lines. IC Role / Device Role / Timing Role: Direction-configurable parallel I/O extender with fail-safe high-Z state on reset. Use Value: DIR pin allows unified firmware control of forward/reverse motor sequencing; OE enables safe shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC245A | Lower VCC range (1.65–3.6 V); faster tpd (5.3 ns @ 3.3 V); no Ioff | Not suitable for mixed 5 V/3.3 V systems or hot-swap isolation | Select only for pure 3.3 V designs requiring higher speed and lower static current |
| SN74ALVC245 | Wider VCC (1.65–3.6 V); higher drive (±24 mA); no Ioff; higher noise immunity | Lacks 5 V-tolerant inputs and power-down blocking capability | Prefer for high-speed 3.3 V buses with heavy capacitive loading, but not for voltage translation or partial power-down |
Compared with 74LVC245A and SN74ALVC245, the SN74LV245ADBR uniquely supports 2–5.5 V operation with 5.5 V-tolerant inputs and Ioff, making it the only choice for robust mixed-voltage backplane interfacing and hot-pluggable subsystems.
Availability
SN74LV245ADBR is available at Aetrix Electronics and suitable for server backplanes, LED display controllers, and industrial network switches requiring stable component supply across extended temperature ranges (–40°C to +125°C).
Supply support for SN74LV245ADBR 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 logic solutions with over 50 years of innovation in industrial, automotive, and communications markets.
The SN74LV245A belongs to TI's LV logic family, engineered for low-voltage operation with high noise immunity and mixed-signal compatibility-designed specifically for voltage-translation and bus-isolation tasks in harsh, thermally demanding environments.
FAQ
What is the maximum operating temperature for SN74LV245ADBR?
The SN74LV245ADBR is rated for operation from –40°C to +125°C ambient temperature, validated per JEDEC JESD78 reliability testing. This extended range supports deployment in industrial motor drives and telecom infrastructure where thermal margins exceed commercial-grade limits. The DB package's RθJA of 113.1 °C/W defines safe power dissipation under natural convection conditions.
Does SN74LV245ADBR support 5 V to 3.3 V level translation?
Yes, SN74LV245ADBR supports true 5 V-to-3.3 V down-translation: its inputs tolerate up to 5.5 V regardless of VCC setting, and outputs swing rail-to-rail within the applied VCC (e.g., 0–3.3 V when VCC = 3.3 V). This eliminates external level shifters in mixed-voltage systems like FPGA-to-peripheral interfaces.
How does the Ioff feature function in SN74LV245ADBR?
The Ioff feature in SN74LV245ADBR disables all outputs when VCC = 0 V, limiting leakage current to ≤5 µA. This prevents damaging back-current flow from live buses into unpowered sections-critical for hot-swap compliance in modular servers and field-replaceable units. Ioff activates automatically; no external control is needed.
What is the recommended bypass capacitor for SN74LV245ADBR?
Texas Instruments recommends a 0.1 µF ceramic capacitor placed as close as possible to the VCC (Pin 20) and GND (Pin 10) pins of SN74LV245ADBR. For systems with shared power rails, adding a parallel 1 µF capacitor improves low-frequency decoupling. This mitigates ground bounce (VOLP < 0.8 V) and ensures stable switching at full speed.
Can SN74LV245ADBR drive a 50 pF load at 10 MHz?
Yes, SN74LV245ADBR can reliably drive a 50 pF load at 10 MHz: its typical propagation delay is 7.5 ns at VCC = 5 V and CL = 50 pF, and its power dissipation capacitance (Cpd) is 25 pF, resulting in <1.25 mW dynamic power per channel. Layout best practices (short traces, ground plane) ensure signal integrity without termination.
SN74LV245ADBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-SSOP (0.209", 5.30mm 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-SSOP
SN74LV245ADBR FAQ
1.How can I place an order for SN74LV245ADBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV245ADBR 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 SN74LV245ADBR reliable?
The price and inventory of SN74LV245ADBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV245ADBR is usually 5 days.
3.What payment methods are accepted for SN74LV245ADBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV245ADBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV245ADBR?
SN74LV245ADBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV245ADBR 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 SN74LV245ADBR?
For technical support, including SN74LV245ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV245ADBR requirements.
6.How does Aetrix verify that SN74LV245ADBR is sourced from the original manufacturer or authorized distributors?
All SN74LV245ADBR 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 SN74LV245ADBR meets industry standards.
7.What is the process for return or replacement of SN74LV245ADBR?
All SN74LV245ADBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV245ADBR, 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 SN74LV245ADBR part is unused and in its original packaging.
Return procedure for SN74LV245ADBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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