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Texas Instruments SN74LVC245ANS
- Part No.:
- SN74LVC245ANS
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVC245ANS.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:277
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Product details
Overview
SN74LVC245ANS 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 features direction control (DIR), output enable (OE), Ioff support for live insertion, 5.5-V-tolerant inputs, and a max propagation delay of 6.3 ns at 3.3 V - used in LED display drivers and mixed-voltage I/O expansion.
For engineers reviewing the SN74LVC245ANS datasheet, SN74LVC245ANS pinout, SN74LVC245ANS application, or SN74LVC245ANS equivalent, key selection criteria include voltage translation capability (5 V ↔ 3.3 V), Ioff-enabled partial-power-down operation, 20-pin SOP (NS) package compatibility, and verified 3.3-V/1.8-V system interfacing performance.
Technical Context
The SN74LVC245ANS implements dual-bus bidirectional data flow controlled by DIR and OE inputs, supporting both A→B and B→A transmission modes. 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, making it suitable for level-shifting in heterogeneous logic systems.
It integrates Ioff circuitry to disable outputs during power-down, preventing back-drive current and enabling hot-plug capability. Latch-up performance exceeds 250 mA per JESD17, and ESD protection meets 2000-V HBM and 1000-V CDM standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports single-supply operation across 1.8-V, 2.5-V, and 3.3-V logic domains |
| Input Voltage Tolerance | Up to 5.5 V - enables direct interfacing with 5-V legacy peripherals without external level shifters |
| Max Propagation Delay | 6.3 ns at 3.3 V - ensures timing compliance in high-speed digital interfaces up to ~100 MHz |
| Ioff Support | Active at VCC = 0 V - prevents damaging current flow during live insertion or partial power-down |
| Output Drive Strength | ±24 mA at 3.0 V - sufficient to drive moderate capacitive loads and longer PCB traces |
| ESD Rating | 2000-V HBM - meets industrial-grade robustness requirements for board-level handling and deployment |
Pinout & Package
SOP-20 (NS) package: 12.80 mm × 7.50 mm body size, surface-mount, gull-wing leads, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | High = A→B data flow; Low = B→A data flow - determines signal path polarity |
| 2–9 (A1–A8) | Port A I/O | Bidirectional data pins connected to one bus segment; tolerate up to 5.5 V regardless of VCC |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and I/O currents |
| 11–18 (B1–B8) | Port B I/O | Bidirectional data pins connected to second bus segment; functionally identical to A-side |
| 19 (OE) | Output Enable Input | Low = outputs active; High = all outputs in high-impedance state - enables bus isolation |
| 20 (VCC) | Power Supply | Supplies core logic and I/O buffers; bypass capacitor required for noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | Enables 5-V inputs to safely interface with 3.3-V or 1.8-V VCC - eliminates need for discrete translators |
| Live-insertion support | Ioff limits current when VCC = 0 V - allows safe replacement in powered-backplane systems |
| Low ground bounce | Typical VOLP < 0.8 V at 3.3 V - reduces switching noise coupling into shared ground planes |
| Fast edge control | Δt/Δv ≤ 10 ns/V - minimizes ringing on unterminated traces under light capacitive loads |
| Latch-up immunity | Exceeds 250 mA per JESD17 - ensures reliability in noisy industrial environments |
Applications
| LED Display Driver Interface | Industrial I/O Expander |
|---|---|
Use Scenario: Driving 8-bit segment/column lines of multiplexed LED displays from a 3.3-V microcontroller while sourcing current from a 5-V supply rail. IC Role / Device Role / Timing Role: Bidirectional level translator and current-boosting buffer between MCU GPIO and display driver ICs. Use Value: Eliminates external level shifters and discrete transistors; leverages 5.5-V input tolerance and ±24-mA drive to directly sink/source display segments. | Use Scenario: Extending GPIO count of a PLC controller using a 1.8-V FPGA and 5-V sensor array. IC Role / Device Role / Timing Role: Asynchronous bidirectional data bridge enabling protocol-agnostic parallel communication between mismatched voltage domains. Use Value: Supports hot-swap maintenance via Ioff; maintains signal integrity across 20-cm PCB traces due to low tpd and controlled edge rates. |
| Server Baseboard Management | Telecom Line Card Interface |
Use Scenario: Isolating SMBus or I²C sideband signals between a 3.3-V BMC and 5-V power management ICs on a server motherboard. IC Role / Device Role / Timing Role: 3-state-controlled bus isolator activated by OE to prevent contention during firmware updates. Use Value: Enables dynamic bus segmentation without layout changes; high-impedance state leakage < ±1 μA preserves signal integrity during sleep modes. | Use Scenario: Interfacing a 2.5-V DSP with legacy 5-V line interface units (LIUs) in access network equipment. IC Role / Device Role / Timing Role: Voltage-translating transceiver managing full-duplex data exchange on T1/E1 parallel control buses. Use Value: Meets -40°C to +125°C extended temperature requirement; 6.3-ns tpd ensures setup/hold margin for 8-MHz control clocking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | TSSOP-20 package (6.50 mm × 4.40 mm); identical electrical specs and pinout | Higher density layout; requires reflow profile adjustment (MSL Level-1 vs NS package) | Select when board space is constrained and automated assembly supports fine-pitch TSSOP. |
| 74LVC245ADW | SOIC-20 package (12.80 mm × 7.50 mm); same pinout but wider body than NS | Compatible with legacy SOIC footprints; slightly higher thermal resistance (RθJA = 78 °C/W vs 59.2 °C/W for NS) | Choose for through-hole prototyping or where SOP-20 footprint is unavailable. |
Compared with SN74LVC245APWR and 74LVC245ADW, the SN74LVC245ANS offers the smallest SOP-20 footprint (7.50 mm × 5.30 mm) with optimal thermal performance for compact industrial controllers, while maintaining full functional and timing equivalence across all three variants.
Availability
SN74LVC245ANS is available at Aetrix Electronics and suitable for industrial I/O expansion, telecom line card interfaces, LED display driver subsystems, and server baseboard management requiring stable component supply and long-term lifecycle support.
Supply support for SN74LVC245ANS 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 and embedded processing solutions, with over 90 years of innovation in high-reliability logic, power, and signal-chain devices.
The SN74LVC245ANS belongs to TI's LVC logic family, engineered for low-voltage mixed-signal interfacing in industrial, communications, and computing systems where voltage translation, power sequencing, and robust ESD performance are critical.
FAQ
What is the maximum operating temperature range for the SN74LVC245ANS?
The SN74LVC245ANS is rated for operation from –40°C to +125°C ambient temperature. This extended range is validated per TI's Recommended Operating Conditions table and supports deployment in harsh industrial and telecom environments where thermal cycling and elevated junction temperatures are common. The SN74LVC245ANS maintains full electrical specifications across this range.
Does the SN74LVC245ANS support 5-V tolerant inputs when VCC = 1.8 V?
Yes, the SN74LVC245ANS supports input voltages up to 5.5 V regardless of VCC setting - including at 1.65 V, 1.8 V, or 2.5 V. This is explicitly confirmed in the Recommended Operating Conditions table (VI = 0 to 5.5 V) and enables reliable down-translation from 5-V logic to lower-voltage domains without external components.
Can the SN74LVC245ANS be used in hot-swap applications?
Yes, the SN74LVC245ANS includes Ioff circuitry that disables outputs when VCC = 0 V, preventing back-drive current during live insertion. This feature is documented in the Feature Description section and verified per JESD78 testing - making the SN74LVC245ANS suitable for modular backplane systems requiring field-replaceable modules.
What is the typical power dissipation capacitance (Cpd) of the SN74LVC245ANS at 3.3 V?
The typical power dissipation capacitance per transceiver channel of the SN74LVC245ANS is 45 pF at VCC = 3.3 V and f = 10 MHz, as specified in Section 7.7 (Operating Characteristics). This value reflects dynamic power consumption during switching and is used to estimate total ICC in high-frequency bus applications.
Is the SN74LVC245ANS pin-compatible with other packages in the SN74LVC245A family?
Yes, the SN74LVC245ANS uses the SOP-20 (NS) package with identical pin numbering and function mapping as shown in the Pin Configuration and Functions table for DB, DGV, DW, N, PW, and RGY packages. All 20-pin variants share the same DIR, OE, A1–A8, B1–B8, GND, and VCC assignments - enabling direct PCB footprint reuse across package types.
SN74LVC245ANS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Bulk
- 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
SN74LVC245ANS FAQ
1.How can I place an order for SN74LVC245ANS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC245ANS 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 SN74LVC245ANS reliable?
The price and inventory of SN74LVC245ANS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC245ANS is usually 5 days.
3.What payment methods are accepted for SN74LVC245ANS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC245ANS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC245ANS?
SN74LVC245ANS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC245ANS 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 SN74LVC245ANS?
For technical support, including SN74LVC245ANS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC245ANS requirements.
6.How does Aetrix verify that SN74LVC245ANS is sourced from the original manufacturer or authorized distributors?
All SN74LVC245ANS 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 SN74LVC245ANS meets industry standards.
7.What is the process for return or replacement of SN74LVC245ANS?
All SN74LVC245ANS units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC245ANS, 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 SN74LVC245ANS part is unused and in its original packaging.
Return procedure for SN74LVC245ANS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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