My Inquiry
My Account
Texas Instruments SN74LVC245ADBR
- Part No.:
- SN74LVC245ADBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVC245ADBR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,248
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LVC245ADBR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data bus communication between 1.65-V and 3.6-V logic domains. It supports mixed-mode I/O (5.5-V-tolerant inputs at 3.3-V VCC), delivers 6.3 ns max propagation delay at 3.3 V, and enables live insertion via Ioff partial-power-down protection - used in LED display drivers and telecom infrastructure backplanes.
For engineers reviewing the SN74LVC245ADBR datasheet, SN74LVC245ADBR pinout, SN74LVC245ADBR application, or SN74LVC245ADBR equivalent, key selection criteria include voltage translation capability (5 V ↔ 3.3 V/1.8 V), 3-state output isolation timing (ten/tdis), Ioff-enabled hot-swap safety, and SSOP-20 package compatibility with legacy board layouts.
Technical Context
This device implements dual-directional 8-bit data flow controlled by a single DIR input and enabled/disabled globally via OE. Its CMOS design ensures balanced high-drive outputs (±24 mA at 3 V) with rail-to-rail VOH/VOL performance and sub-1 ns output skew (tsk(o) ≤ 1.5 ns).
The transceiver features overvoltage-tolerant inputs (up to 5.5 V independent of VCC), latch-up immunity (>250 mA per JESD17), and ESD robustness (2000-V HBM, 1000-V CDM). Its Ioff circuitry actively disables outputs during power-down to prevent back-drive current, enabling safe operation in partial-power-down systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports interoperability across 1.8-V, 2.5-V, and 3.3-V logic families without level shifters. |
| Input Voltage Tolerance | Up to 5.5 V - allows direct connection to 5-V microcontrollers or legacy peripherals without external clamping. |
| Max Propagation Delay | 6.3 ns at 3.3 V - enables reliable operation in high-speed bus interfaces up to ~80 MHz clock-equivalent rates. |
| Output Drive Strength | ±24 mA at VCC = 3 V - sufficient to drive 50-Ω PCB traces or multiple CMOS loads without buffering. |
| Ioff Current | ±10 μA at VI/VO = 5.5 V - guarantees <100 μA total leakage during power-down, preventing system-level backfeed. |
| ESD Rating | 2000-V HBM - meets industrial-grade handling requirements without special ESD precautions beyond standard protocols. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, base station, and industrial control environments. |
Pinout & Package
SN74LVC245ADBR uses the SSOP-20 (DB) package: 7.50 mm × 5.30 mm body, 0.65 mm lead pitch, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | High = A→B data flow; Low = B→A; determines signal path polarity for all eight channels simultaneously. |
| 2–9 (A1–A8) | Port A I/O | Bidirectional data pins connected to one bus segment; tolerate 5.5-V inputs regardless of VCC setting. |
| 10 (GND) | Ground Reference | Primary return path for all I/O and internal logic; must be low-impedance to minimize ground bounce (VOLP < 0.8 V). |
| 11–18 (B1–B8) | Port B I/O | Bidirectional data pins connected to second bus segment; electrically identical to A-side with same voltage tolerance. |
| 19 (OE) | Output Enable Input | Active-Low: OE = Low enables transceiver; OE = High forces all A/B pins into high-impedance state for bus isolation. |
| 20 (VCC) | Power Supply | Supplies core logic and I/O buffers; requires local 0.1-μF ceramic bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-voltage interface | 5-V-tolerant inputs enable seamless bridging between 5-V microcontrollers and 3.3-V/1.8-V FPGAs or ASICs. |
| Live-insertion support | Ioff circuitry limits off-state leakage to ±10 μA, allowing safe hot-plug operation in modular backplane systems. |
| Low ground bounce | Typical VOLP < 0.8 V at 3.3 V ensures stable logic-low references during heavy simultaneous switching. |
| Fast enable/disable timing | ten = 4.4 ns / tdis = 4.1 ns at 3.3 V enables rapid bus arbitration and dynamic channel reconfiguration. |
| Rail-to-rail output swing | VOH ≥ VCC – 0.2 V and VOL ≤ 0.24 V at 1.65 V guarantee full noise margin across entire supply range. |
Applications
| LED Display Driver Interface | Telecom Backplane Bus Isolation |
|---|---|
|
Use Scenario: Driving multiplexed 7-segment or dot-matrix LED panels from a 3.3-V MCU while sourcing sink current up to 24 mA per segment. IC Role / Device Role / Timing Role: Bidirectional level-translating buffer that isolates MCU GPIOs from high-current LED loads and enables shared bus access across multiple display modules. Use Value: Eliminates need for discrete MOSFETs or dedicated LED drivers; reduces BOM count and layout area while maintaining timing integrity (tpd ≤ 6.3 ns). |
Use Scenario: Isolating control-plane and data-plane buses in carrier-grade Ethernet switches operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Hot-swappable bus transceiver providing galvanic separation between line-card and switch-fabric interfaces using OE-controlled 3-state outputs. Use Value: Enables field-replaceable module insertion without powering down the chassis; Ioff prevents back-drive damage during partial power-down sequences. |
| Industrial I/O Expander Interface | Motor Control Logic Translation |
|
Use Scenario: Connecting a 5-V PLC output module to a 3.3-V FPGA-based motion controller in factory automation equipment. IC Role / Device Role / Timing Role: Voltage-domain translator ensuring deterministic signal propagation (VIH/VIL thresholds scale with VCC) and preventing false triggering due to floating inputs. Use Value: Removes requirement for external pull-up resistors on 5-V signals; simplifies firmware logic by eliminating software-level voltage scaling. |
Use Scenario: Interfacing a 5-V Hall-effect sensor array to a 1.8-V motor driver IC in BLDC inverter control loops. IC Role / Device Role / Timing Role: Low-latency direction-controlled transceiver synchronizing rotor position feedback with gate-driver timing (tpd ≤ 7.3 ns at 1.8 V). Use Value: Maintains sub-10 ns timing correlation between sensing and actuation paths, critical for commutation accuracy and torque ripple reduction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVCH245A | Includes bus-hold circuitry on all I/O pins; higher ICC (30 μA typical vs. 10 μA); same VCC range and pinout. | Preferred where unused inputs must remain latched without external pull resistors (e.g., sparse I/O expansion). | Select SN74LVCH245A only if bus-hold functionality is required; otherwise SN74LVC245ADBR offers lower quiescent power and identical timing. |
| 74ALVC245 | Higher speed (tpd ≤ 3.5 ns at 3.3 V); tighter VOH/VOL specs; same 1.65–3.6-V VCC but no 5.5-V input tolerance. | Suitable for ultra-low-latency interconnects where voltage translation is not needed (e.g., homogeneous 3.3-V subsystems). | Choose 74ALVC245 only when maximum speed is critical and all connected devices operate at matched VCC; SN74LVC245ADBR remains superior for mixed-voltage designs. |
Compared with SN74LVCH245A and 74ALVC245, the SN74LVC245ADBR uniquely balances 5.5-V input tolerance, Ioff safety, and SSOP-20 footprint - making it the optimal choice for industrial backplanes and legacy-to-modern interface bridging where reliability and voltage flexibility outweigh marginal speed gains.
Availability
SN74LVC245ADBR is available at Aetrix Electronics and suitable for LED display drivers, telecom backplane isolation, and industrial I/O expander interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVC245ADBR 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 experience in high-reliability logic and interface solutions.
The SN74LVC245ADBR belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for robust mixed-signal interfacing in industrial, automotive, and communications systems where voltage translation, hot-swap safety, and wide temperature operation are essential.
FAQ
What is the maximum input voltage rating for SN74LVC245ADBR?
The SN74LVC245ADBR accepts input voltages up to 5.5 V on all A- and B-side pins, regardless of VCC setting (1.65 V to 3.6 V). This overvoltage tolerance enables direct interfacing with 5-V logic without external clamping diodes or level shifters, and is explicitly specified in the Absolute Maximum Ratings table of the datasheet.
Does SN74LVC245ADBR support hot-swap or live-insertion applications?
Yes, SN74LVC245ADBR supports live insertion via its Ioff feature: when VCC = 0 V, the Ioff circuitry limits input/output leakage to ±10 μA, preventing damaging back-current flow from powered buses into unpowered sections. This capability is validated per JESD78 and documented in Section 9.3 of the datasheet.
What is the propagation delay of SN74LVC245ADBR at 3.3 V?
At VCC = 3.3 V and TA = 25°C, the maximum propagation delay (tpd) of SN74LVC245ADBR is 6.3 ns, measured from input transition to valid output transition under 30-pF load conditions. This value is guaranteed across –40°C to +125°C per the Switching Characteristics table (Section 7.6).
Which package type does SN74LVC245ADBR use, and what are its mechanical dimensions?
SN74LVC245ADBR uses the SSOP-20 (DB) package: 7.50 mm × 5.30 mm body size, 0.65 mm lead pitch, gull-wing leads, and 1.0 mm nominal height. Its land pattern and soldering profile comply with JEDEC MO-153, and thermal resistance RθJA is 78°C/W per Section 7.4 of the datasheet.
How does the DIR pin control data flow direction in SN74LVC245ADBR?
In SN74LVC245ADBR, the DIR pin is a logic-level control: when DIR = High, data flows from Port A (pins 2–9) to Port B (pins 11–18); when DIR = Low, data flows from Port B to Port A. This behavior is defined in the Function Table (Table 1) and applies identically to all eight channels simultaneously.
SN74LVC245ADBR 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:
- 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:
- 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
SN74LVC245ADBR FAQ
1.How can I place an order for SN74LVC245ADBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC245ADBR 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 SN74LVC245ADBR reliable?
The price and inventory of SN74LVC245ADBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC245ADBR is usually 5 days.
3.What payment methods are accepted for SN74LVC245ADBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC245ADBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC245ADBR?
SN74LVC245ADBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC245ADBR 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 SN74LVC245ADBR?
For technical support, including SN74LVC245ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC245ADBR requirements.
6.How does Aetrix verify that SN74LVC245ADBR is sourced from the original manufacturer or authorized distributors?
All SN74LVC245ADBR 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 SN74LVC245ADBR meets industry standards.
7.What is the process for return or replacement of SN74LVC245ADBR?
All SN74LVC245ADBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC245ADBR, 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 SN74LVC245ADBR part is unused and in its original packaging.
Return procedure for SN74LVC245ADBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LVC245ADBR Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
