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Texas Instruments SN74LVT245BDBR
- Part No.:
- SN74LVT245BDBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVT245BDBR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:11,945
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Product details
Overview
SN74LVT245BDBR from Texas Instruments is a 3.3-V ABT octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between 3.3-V and 5-V systems. It features direction control (DIR), output enable (OE), hot-insertion support via Ioff and power-up 3-state, and operates from −40°C to 85°C in a 20-pin SSOP (DB) package.
For engineers reviewing the SN74LVT245BDBR datasheet, SN74LVT245BDBR pinout, SN74LVT245BDBR application, or SN74LVT245BDBR equivalent, this page delivers verified electrical specs, thermal performance (θJA = 70°C/W), mixed-mode voltage tolerance (5-V inputs/outputs with 3.3-V VCC), and real-world use cases in level-shifting backplane interfaces and hot-pluggable peripheral modules.
Technical Context
The SN74LVT245BDBR implements an advanced BiCMOS ABT (Advanced Bus Transceiver) architecture enabling TTL-compatible signaling at 3.3-V supply while accepting 5-V inputs and driving 5-V loads. Its dual-control logic (DIR + OE) allows precise bus isolation and directional flow management without external logic.
It integrates Ioff circuitry to disable outputs during power-down, preventing backflow current, and power-up 3-state logic that maintains high-impedance outputs during VCC ramp-up/down-critical for hot-insertion compliance in modular computing and telecom systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 2.7 V to 3.6 V - supports unregulated battery operation down to 2.7 V without functional degradation. |
| Input Voltage Tolerance | −0.5 V to 7 V - enables direct connection to 5-V logic without level shifters. |
| Output Drive Strength | IOL = 64 mA / IOH = −32 mA - sufficient to drive standard TTL loads and stubs on backplane traces. |
| Propagation Delay | tPLH/tPHL ≤ 3.5 ns @ VCC = 3.3 V - ensures sub-4 ns timing for high-speed 32-bit data paths. |
| Thermal Resistance | θJA = 70°C/W (DB package) - defines maximum power dissipation margin under natural convection cooling. |
| ESD Protection | HBM = 2000 V, MM = 200 V, CDM = 1000 V - exceeds JEDEC JESD22-A114/A115/C101 for robust board handling. |
| Latch-Up Immunity | >100 mA per JESD78 Class II - prevents destructive latch-up during transient overvoltage events. |
Pinout & Package
SN74LVT245BDBR uses a 20-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, 7.4 mm × 5.3 mm body, and 2.0 mm max height per JEDEC MO-150. Pin 1 index is marked by a beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: LOW enables B→A data flow; HIGH enables A→B flow. |
| 2–9 | A1–A8 | Octal A-side data bus inputs/outputs - connect to local 3.3-V subsystem (e.g., FPGA I/O bank). |
| 10 | GND | Ground reference for all internal circuitry and signal return path. |
| 11 | VCC | 3.3-V supply input - must be decoupled locally with ≥0.1 μF ceramic capacitor. |
| 12 | OE | Output enable active-low: LOW enables transceiver; HIGH forces all A/B outputs into high-impedance state. |
| 13–20 | B1–B8 | Octal B-side data bus inputs/outputs - interface to 5-V legacy bus (e.g., ISA, PCI-X control lines). |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | Accepts 5-V inputs and drives 5-V loads while powered from 3.3-V VCC - eliminates external level shifters in hybrid-voltage systems. |
| Hot-insertion support | Ioff and power-up 3-state prevent current backflow and bus contention during live card insertion - required for modular server and telecom chassis. |
| Low ground bounce | VOLP < 0.8 V @ VCC = 3.3 V - minimizes noise coupling into adjacent digital signals during simultaneous switching. |
| Wide operating temperature | −40°C to +85°C - qualified for industrial and extended-temperature embedded applications. |
| Robust ESD/latch-up immunity | Exceeds JESD22-A114 (2000 V HBM) and JESD78 Class II (100 mA) - reduces field failure risk in handling and deployment. |
Applications
| Industrial Backplane Interface | Hot-Pluggable Peripheral Module |
|---|---|
Use Scenario: Interfacing a 3.3-V FPGA-based control module to a legacy 5-V ISA-style backplane in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing data flow between A-bus (FPGA side) and B-bus (backplane side) with DIR-controlled direction and OE-gated isolation. Use Value: Enables drop-in replacement of obsolete 5-V transceivers without redesigning power or signal integrity - preserves existing backplane layout and firmware. |
Use Scenario: Adding USB or RS-232 expansion cards to a hot-swap-capable industrial PC chassis. IC Role / Device Role / Timing Role: Isolates host-side 3.3-V logic from peripheral-side 5-V signaling during insertion/removal using Ioff and power-up 3-state behavior. Use Value: Prevents bus contention and system reset during live card swap - meets IEC 61000-4-2 and Telcordia GR-1089-CORE surge immunity requirements. |
| Embedded Memory Expansion | Test Equipment Signal Conditioning |
Use Scenario: Connecting a low-power 3.3-V microcontroller to external 5-V SRAM or Flash memory in portable test instrumentation. IC Role / Device Role / Timing Role: Octal transceiver buffering address/data lines with sub-4 ns propagation delay to maintain memory access timing budgets. Use Value: Eliminates need for discrete MOSFET level shifters - reduces BOM count and PCB area while improving signal fidelity. |
Use Scenario: Level translation between 3.3-V digital pattern generator outputs and 5-V DUT (device-under-test) inputs in automated test equipment. IC Role / Device Role / Timing Role: Direction-controlled signal conditioning block ensuring clean, glitch-free transitions during test vector loading. Use Value: Guarantees <0.8 V ground bounce during full-bus switching - prevents false triggering or timing violations in sensitive analog/digital hybrid circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVTH245DBR | Lower drive strength (IOL = 24 mA), higher VOL (0.55 V @ 24 mA), same DB package and pinout. | Suitable only for low-load, low-speed interfaces (<25 MHz); not recommended for legacy 5-V bus termination. | Select when power budget is constrained and load capacitance is ≤30 pF per line. |
| SN74ALVC164245DLR | 16-bit, dual-supply (VCCA = 1.65–3.6 V, VCCB = 2.3–3.6 V), no 5-V tolerance - requires external clamping for 5-V systems. | Designed for 3.3-V ↔ 1.8-V translation; incompatible with direct 5-V interfacing without protection diodes. | Choose only for modern low-voltage domain bridging; avoid for mixed 3.3/5-V environments. |
Compared with SN74LVTH245DBR and SN74ALVC164245DLR, the SN74LVT245BDBR uniquely supports true 5-V-tolerant I/O at 3.3-V VCC with 64-mA drive strength - making it the only option among the three qualified for legacy backplane integration without supplemental circuitry.
Availability
SN74LVT245BDBR is available at Aetrix Electronics and suitable for industrial backplane interfaces, hot-pluggable peripheral modules, embedded memory expansion, and test equipment signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVT245BDBR 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 SN74LVT245BDBR belongs to TI's ABT logic family, engineered specifically for high-speed, mixed-voltage bus interfacing in mission-critical infrastructure where reliability, hot-swap capability, and wide operating margins are mandatory.
FAQ
What is the maximum operating temperature range for the SN74LVT245BDBR?
The SN74LVT245BDBR is rated for operation from −40°C to +85°C ambient temperature, fully specified across this industrial temperature range per its recommended operating conditions. This rating applies to the DB-package variant and is validated through TI's production testing and qualification process.
Does the SN74LVT245BDBR support hot insertion, and how is it implemented?
Yes, the SN74LVT245BDBR supports hot insertion via two integrated features: Ioff circuitry disables outputs when VCC = 0 V to prevent damaging current backflow, and power-up 3-state logic holds all outputs in high-impedance during VCC ramp-up/down. These functions are inherent to the SN74LVT245BDBR silicon design and require no external components.
Can the SN74LVT245BDBR interface directly with 5-V logic while powered from 3.3 V?
Yes, the SN74LVT245BDBR accepts 5-V inputs and drives 5-V loads while operating from a 3.3-V VCC supply. Its input voltage range extends to 7 V, and its output structure maintains valid VOH/VOL levels into 5-V loads - eliminating the need for external level-shifting circuitry in mixed-voltage systems.
What is the thermal resistance (θJA) of the SN74LVT245BDBR in its SSOP package?
The SN74LVT245BDBR in the SSOP (DB) package has a junction-to-ambient thermal resistance (θJA) of 70°C/W, measured per JESD 51-7 under standard JEDEC test board conditions. This value is used to calculate maximum allowable power dissipation for thermal design validation.
How does the DIR and OE control logic function in the SN74LVT245BDBR?
In the SN74LVT245BDBR, DIR determines data direction: DIR = LOW enables B→A transmission; DIR = HIGH enables A→B transmission. OE is active-low enable: OE = LOW activates the transceiver; OE = HIGH places all A and B pins in high-impedance state - providing complete bus isolation independent of DIR state.
SN74LVT245BDBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVT
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74LVT245BDBR FAQ
1.How can I place an order for SN74LVT245BDBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVT245BDBR 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 SN74LVT245BDBR reliable?
The price and inventory of SN74LVT245BDBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVT245BDBR is usually 5 days.
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SN74LVT245BDBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVT245BDBR 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 SN74LVT245BDBR?
For technical support, including SN74LVT245BDBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVT245BDBR requirements.
6.How does Aetrix verify that SN74LVT245BDBR is sourced from the original manufacturer or authorized distributors?
All SN74LVT245BDBR 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 SN74LVT245BDBR meets industry standards.
7.What is the process for return or replacement of SN74LVT245BDBR?
All SN74LVT245BDBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVT245BDBR, 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 SN74LVT245BDBR part is unused and in its original packaging.
Return procedure for SN74LVT245BDBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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