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Texas Instruments SN74LVC245ANSR
- Part No.:
- SN74LVC245ANSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVC245ANSR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:6,480
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Product details
Overview
SN74LVC245ANSR 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), features Ioff for live insertion and partial-power-down protection, and delivers 6.3 ns max propagation delay at 3.3 V - used in LED display drivers and telecom infrastructure backplanes.
For engineers reviewing the SN74LVC245ANSR datasheet, SN74LVC245ANSR pinout, SN74LVC245ANSR application, or SN74LVC245ANSR equivalent, key selection criteria include voltage translation capability (5 V → 3.3 V), 3-state output isolation timing (ten/tdis ≤ 8.5 ns), Ioff-enabled back-drive protection, and SOP-20 package compatibility with industrial temperature range (–40°C to 125°C).
Technical Context
The SN74LVC245ANSR implements a direction-controlled, dual-bus transceiver architecture with independent DIR and OE inputs. Its CMOS design enables rail-to-rail input tolerance up to 5.5 V while operating from 1.65 V to 3.6 V VCC, allowing direct interfacing between 5-V legacy peripherals and 3.3-V or 1.8-V logic domains without external level shifters.
Functional modes are defined by DIR (A→B or B→A) and OE (enabled or high-impedance). The device includes robust ESD protection (2000-V HBM, 1000-V CDM), latch-up immunity (>250 mA per JESD17), and ground-bounce/undershoot control (VOLP < 0.8 V, VOHV > 2 V at 3.3 V), critical for noise-sensitive digital backplane applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - enables interoperability across 1.8-V, 2.5-V, and 3.3-V system domains |
| Input Voltage Tolerance | Up to 5.5 V - allows direct connection to 5-V TTL/CMOS sources without clamping diodes |
| Max Propagation Delay | 6.3 ns at 3.3 V - supports high-speed bus rates up to ~80 MHz with margin |
| Ioff Current | ±10 μA at 5.5 V - prevents damaging back-current during hot-swap or partial power-down |
| Output Drive Strength | ±24 mA at 3.0 V - drives standard 50-Ω PCB traces or multiple CMOS loads |
| ESD Rating | 2000-V HBM - meets industrial handling requirements without special ESD precautions |
| Operating Temperature | –40°C to 125°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
SOP-20 (NS) package: 7.50 mm × 5.30 mm body, 1.27 mm pitch, surface-mount, RoHS-compliant, MSL Level-1 (260°C reflow unlimited).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | High = A→B data flow; Low = B→A; determines real-time bus directionality |
| 2–9 (A1–A8) | Port A I/O | Bidirectional data pins tied to source-side bus; tolerate 5.5 V regardless of VCC |
| 10 (GND) | Ground Reference | Primary return path for all I/O and internal logic; must be low-inductance |
| 11–18 (B1–B8) | Port B I/O | Bidirectional data pins tied to sink-side bus; identical electrical specs to A-port |
| 19 (OE) | Output Enable Input | Low = transceiver active; High = all outputs in high-impedance state for bus isolation |
| 20 (VCC) | Power Supply | Single supply for core logic and I/O; bypass capacitor required per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-voltage interface | Accepts 5-V inputs while powered from 1.65–3.6 V - eliminates external level translators in 3.3/5-V hybrid systems |
| Ioff partial-power-down | Disables outputs and blocks current flow when VCC = 0 - enables safe live insertion into powered backplanes |
| 3-state output control | Dual independent controls (DIR + OE) allow precise bus arbitration and multi-drop contention management |
| Low ground bounce | VOLP < 0.8 V at 3.3 V - reduces simultaneous switching noise in dense PCB layouts |
| Wide temperature range | Specified from –40°C to 125°C - supports deployment in extended-temperature industrial and telecom equipment |
Applications
| LED Display Driver Interface | Telecom Backplane Data Bridge |
|---|---|
Use Scenario: Driving multiplexed 7-segment or dot-matrix LED displays from a 3.3-V microcontroller while sourcing current from a 5-V rail. IC Role / Device Role / Timing Role: Bidirectional level translator and current-boosting buffer between MCU GPIO and LED column drivers. Use Value: Eliminates discrete MOSFETs or dedicated level shifters; ±24 mA drive sustains brightness across 8 segments simultaneously. | Use Scenario: Isolating and translating control signals between 5-V management ASICs and 3.3-V FPGA-based packet processors in modular line cards. IC Role / Device Role / Timing Role: Asynchronous bus transceiver enabling hot-swappable module communication with deterministic enable/disable timing. Use Value: Ioff protection prevents back-driving during card insertion; 6.3 ns tpd ensures sub-10 ns signal integrity across 20-cm backplane traces. |
| Industrial I/O Expander Hub | Motor Control Logic Interface |
Use Scenario: Extending GPIO count of a PLC CPU to interface with 5-V sensors and actuators using a 3.3-V SoC. IC Role / Device Role / Timing Role: Octal bidirectional port expander with configurable direction and output disable for fault-safe I/O partitioning. Use Value: DIR pin allows dynamic reconfiguration of input/output assignment per channel group; OE enables full port shutdown during error recovery. | Use Scenario: Interfacing a 3.3-V motion controller to 5-V stepper driver ICs requiring TTL-compatible enable and step/dir signals. IC Role / Device Role / Timing Role: Robust signal conditioner providing voltage translation, noise immunity, and bus isolation between controller and power stage. Use Value: 5.5-V tolerant inputs withstand motor-induced transients; VOLP/VOHV specs suppress false triggering in electrically noisy motor cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC245ADBR | SSOP-20 package (7.50 mm × 5.30 mm); identical electrical specs and marking (LC245A) | No thermal or routing difference; same industrial temp range and RoHS compliance | Select when SSOP footprint matches existing layout or preferred tape-and-reel packaging (2000 pcs/reel) |
| SN74LVC245APWR | TSSOP-20 package (6.50 mm × 4.40 mm); 0.65 mm pitch vs NS's 1.27 mm; same logic and timing | Higher density placement; slightly lower RθJA (59.2°C/W vs 78°C/W for NS) improves thermal headroom | Choose for space-constrained designs where smaller footprint and improved thermal performance justify rework |
Compared with SN74LVC245ADBR and SN74LVC245APWR, the SN74LVC245ANSR offers identical functionality in SOP-20 - providing mechanical compatibility with legacy through-hole-to-SMT transitions, easier hand-soldering verification, and proven reliability in industrial control modules where board-level serviceability matters.
Availability
SN74LVC245ANSR is available at Aetrix Electronics and suitable for LED display interfaces, telecom backplane bridges, industrial I/O expanders, motor control logic interfaces, and mixed-voltage embedded systems requiring stable component supply across long production lifecycles.
Supply support for SN74LVC245ANSR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The SN74LVC245A product line targets voltage-translation and bus-isolation needs in mixed-supply digital systems - engineered for interoperability, robustness, and seamless integration into cost-sensitive, high-reliability applications.
FAQ
What is the maximum input voltage the SN74LVC245ANSR can tolerate?
The SN74LVC245ANSR accepts input voltages up to 5.5 V on all A- and B-port pins, regardless of VCC level (1.65 V to 3.6 V). This overvoltage tolerance enables direct interfacing with 5-V TTL or CMOS logic without external clamping or level-shifting circuitry - a key feature confirmed in the Recommended Operating Conditions table of the official TI datasheet SCAS218X.
Does the SN74LVC245ANSR support hot-plug or live-insertion applications?
Yes, the SN74LVC245ANSR supports live insertion via its Ioff feature: when VCC = 0 V, the Ioff circuitry disables all outputs and limits input/output leakage to ±10 μA at 5.5 V, preventing damaging back-current flow. This behavior is explicitly specified in Section 7.5 (Electrical Characteristics) and validated per JESD78, making SN74LVC245ANSR suitable for modular telecom and industrial backplane systems.
What is the propagation delay of the SN74LVC245ANSR at 3.3 V?
The SN74LVC245ANSR has a maximum propagation delay (tpd) of 6.3 ns at VCC = 3.3 V ± 0.3 V, measured under load conditions of CL = 50 pF and TA = 25°C. This value is guaranteed across the full industrial temperature range (–40°C to 125°C), with typical performance at 3.8 ns - enabling reliable operation in high-speed digital interfaces up to 80 MHz.
Can the SN74LVC245ANSR translate 5-V signals to 1.8-V logic levels?
Yes, the SN74LVC245ANSR supports down-translation from 5-V inputs to 1.8-V outputs: when VCC = 1.8 V, the device accepts 5-V inputs (VI ≤ 5.5 V) and produces valid 1.8-V logic-level outputs (VOH ≥ 1.29 V, VOL ≤ 0.45 V per Section 7.5). This capability is documented in the Feature Description section and verified in mixed-mode operation testing.
What package type and dimensions does the SN74LVC245ANSR use?
The SN74LVC245ANSR uses the SOP-20 (NS) package: 7.50 mm × 5.30 mm body size, 1.27 mm lead pitch, surface-mount, RoHS-compliant, and MSL Level-1 rated for unlimited 260°C reflow. Pin 1 identifier is a beveled corner, and the part marking is "LVC245A", as confirmed in TI's Package Option Addendum and Mechanical Drawing SLMA002.
SN74LVC245ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-SOIC (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-SO
SN74LVC245ANSR FAQ
1.How can I place an order for SN74LVC245ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC245ANSR 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 SN74LVC245ANSR reliable?
The price and inventory of SN74LVC245ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC245ANSR is usually 5 days.
3.What payment methods are accepted for SN74LVC245ANSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC245ANSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC245ANSR?
SN74LVC245ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC245ANSR 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 SN74LVC245ANSR?
For technical support, including SN74LVC245ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC245ANSR requirements.
6.How does Aetrix verify that SN74LVC245ANSR is sourced from the original manufacturer or authorized distributors?
All SN74LVC245ANSR 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 SN74LVC245ANSR meets industry standards.
7.What is the process for return or replacement of SN74LVC245ANSR?
All SN74LVC245ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC245ANSR, 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 SN74LVC245ANSR part is unused and in its original packaging.
Return procedure for SN74LVC245ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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