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Texas Instruments SN74LVC245ADWG4
- Part No.:
- SN74LVC245ADWG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVC245ADWG4.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,023
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Product details
Overview
SN74LVC245ADWG4 from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between 1.65-V to 3.6-V buses. It features direction control (DIR), output enable (OE), 5.5-V-tolerant inputs, 6.3 ns max propagation delay at 3.3 V, and Ioff support for live insertion in mixed-voltage systems - used in LED displays, network switches, and I/O expanders.
For engineers reviewing the SN74LVC245ADWG4 datasheet, SN74LVC245ADWG4 pinout, SN74LVC245ADWG4 application, or SN74LVC245ADWG4 equivalent, key selection criteria include voltage translation capability (5 V ↔ 3.3 V), 3-state isolation timing (ten/tdis), thermal performance in SOIC-20 package, and compatibility with partial-power-down system architectures.
Technical Context
The SN74LVC245ADWG4 implements a dual-bus, 8-bit bidirectional transceiver architecture with independent DIR and OE controls. Its CMOS design supports mixed-mode signal operation: inputs tolerate up to 5.5 V regardless of VCC (1.65–3.6 V), enabling robust level-shifting between 5-V legacy peripherals and 3.3-V or 1.8-V logic domains.
Functional modes are strictly defined by OE (enable/disable) and DIR (A→B or B→A). When OE is high, outputs enter high-impedance state regardless of DIR; when OE is low, data flows per DIR polarity. Ioff circuitry actively disables outputs during power-down, preventing back-drive current and latch-up (exceeding 250 mA per JESD17).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - enables operation across 1.8-V, 2.5-V, and 3.3-V logic domains without external level shifters |
| Input Voltage Tolerance | Up to 5.5 V - allows direct interfacing with 5-V TTL/CMOS sources while powered from 3.3-V or lower rails |
| Max Propagation Delay | 6.3 ns at VCC = 3.3 V - supports high-speed bus communication up to ~80 MHz under light load |
| Output Drive Strength | ±24 mA at VCC = 3.0 V - sufficient to drive 50-Ω transmission lines or multiple CMOS loads without buffering |
| Ioff Current | ±10 μA at VI/VO = 5.5 V - ensures safe hot-plug operation and prevents damaging back-current during partial power-down |
| ESD Protection | 2000-V HBM, 1000-V CDM - meets industrial-grade ESD robustness requirements without external protection |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood, industrial control, and telecom infrastructure environments |
Pinout & Package
SN74LVC245ADWG4 is packaged in a 20-pin SOIC (DW) body measuring 12.80 mm × 7.50 mm, with standard 0.300-inch width and 0.050-inch lead pitch. The package is RoHS-compliant, NIPDAU lead-finished, and rated 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 data flow - determines real-time bus directionality without reset |
| 19 (OE) | Output Enable Input | Low = transceiver active; High = all A/B ports placed in high-impedance state - enables bus arbitration and isolation |
| A1–A8 (Pins 2–9) | Port A I/O | Bidirectional data pins for first bus segment - tolerate 5.5-V inputs regardless of VCC setting |
| B1–B8 (Pins 11–18) | Port B I/O | Bidirectional data pins for second bus segment - electrically identical to Port A, fully symmetrical |
| 10 (GND) | Ground Reference | Primary return path for all I/O and internal logic - must be low-inductance connection for noise immunity |
| 20 (VCC) | Power Supply | Single supply input for entire device - requires local 0.1-μF ceramic bypass capacitor adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-voltage interface support | Enables direct 5-V ↔ 3.3-V/1.8-V translation without external components - reduces BOM count and layout area |
| Live-insertion capability | Ioff circuitry limits off-state leakage to ±10 μA at 5.5 V - permits safe board replacement in powered-backplane systems |
| Fast switching with controlled edge rates | 6.3 ns tpd at 3.3 V with Δt/Δv ≤10 ns/V - balances speed and signal integrity on PCB traces up to 10 cm |
| Robust bus contention immunity | Latch-up performance >250 mA per JESD17 - withstands temporary bus conflicts without permanent damage |
| Low dynamic power consumption | Cpd = 45 pF at 3.3 V - minimizes switching current in high-frequency data bursts typical in display and networking applications |
Applications
| LED Display Driver Interface | Industrial Network Switch Backplane |
|---|---|
Use Scenario: Driving column/row lines of large-format 5-V LED matrices from a 3.3-V microcontroller. IC Role / Device Role / Timing Role: Bidirectional level translator and bus buffer - isolates MCU I/O from high-current LED sink drivers while translating logic levels. Use Value: Eliminates discrete level-shifters and reduces GPIO pin count via shared data bus; 24-mA drive sustains brightness across 16×16 segments without external drivers. | Use Scenario: Interfacing 5-V PHY controllers to 3.3-V switch fabric ASICs in managed Ethernet switches. IC Role / Device Role / Timing Role: Asynchronous data bridge with configurable direction - enables flexible MDIO/MII register access and status reporting paths. Use Value: 6.3-ns tpd ensures setup/hold compliance at 25-MHz MII clock; Ioff prevents backfeed during PHY hot-swap maintenance. |
| Motor Control I/O Expander | Cable Modem Termination System |
Use Scenario: Extending GPIO count of a 1.8-V motor driver MCU to control 5-V optocoupled gate drivers and feedback sensors. IC Role / Device Role / Timing Role: Voltage-translating I/O expander - provides isolated, direction-controlled data lanes between MCU and peripheral modules. Use Value: 5.5-V input tolerance accepts sensor signals directly; ±24-mA outputs drive optocoupler LEDs without additional transistors. | Use Scenario: Bridging DOCSIS 3.0 baseband processor (3.3-V) and legacy 5-V RF front-end ICs in cable modem hardware. IC Role / Device Role / Timing Role: Synchronous bus transceiver - manages upstream/downstream data framing and register configuration over shared control bus. Use Value: Supports full-duplex operation via DIR control; 125°C rating ensures reliability in sealed, thermally constrained modem enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWRG4 | TSSOP-20 package (6.50 mm × 4.40 mm); 1.5× smaller footprint; same electrical specs and pinout | Better suited for space-constrained PCBs; slightly higher thermal resistance (RθJA = 83.6°C/W vs. 78°C/W for DW) | Select when board area is critical and thermal margin allows - requires rework of land pattern and stencil |
| 74LVC245ABQ | DFN-20 (RGY) package (4.50 mm × 3.50 mm); wettable flank leads; RθJA = 108.1°C/W | Optimized for automated optical inspection and high-density routing; not through-hole compatible | Choose for ultra-compact designs with AOI requirements; verify solder paste volume and reflow profile for QFN |
Compared with SN74LVC245APWRG4 and 74LVC245ABQ, SN74LVC245ADWG4 offers the lowest thermal resistance in SOIC-20, highest mechanical robustness for manual assembly and field repair, and broadest distributor availability - making it optimal for prototyping, industrial control, and medium-volume production where thermal headroom and serviceability matter.
Availability
SN74LVC245ADWG4 is available at Aetrix Electronics and suitable for LED displays, network switches, and motor drivers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for SN74LVC245ADWG4 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 solutions, with decades of expertise in logic interface ICs and industrial-grade reliability.
The SN74LVC245A product line delivers robust, low-voltage octal transceivers optimized for mixed-signal system interconnect - targeting applications demanding voltage translation, bus isolation, and hot-swap resilience in harsh environments.
FAQ
What is the maximum operating voltage on the inputs of SN74LVC245ADWG4?
The SN74LVC245ADWG4 inputs accept voltages up to 5.5 V regardless of VCC level - verified across the full 1.65-V to 3.6-V supply range. This overvoltage tolerance enables direct interfacing with 5-V TTL or CMOS devices without external clamping or level-shifting circuitry. The specification is guaranteed per TI's Recommended Operating Conditions table and confirmed in absolute maximum ratings.
Does SN74LVC245ADWG4 support true bidirectional data flow?
Yes, SN74LVC245ADWG4 supports true bidirectional data flow via its DIR pin: when DIR = HIGH, data propagates from Port A to Port B; when DIR = LOW, data flows from Port B to Port A. This real-time direction control operates independently of OE, allowing dynamic bus reversal without disabling outputs - essential for protocols like MDIO and custom backplane handshaking.
Can SN74LVC245ADWG4 be used in partial-power-down systems?
Yes, SN74LVC245ADWG4 includes Ioff circuitry that disables outputs and limits leakage to ±10 μA when VCC = 0 V and any input or output is at 5.5 V. This feature is explicitly validated per JESD78 and supports live insertion, hot-swap, and partial-power-down architectures - critical for modular telecom and industrial control systems where subsystems power up/down asynchronously.
What is the thermal resistance (RθJA) of SN74LVC245ADWG4 in its SOIC-20 package?
The junction-to-ambient thermal resistance (RθJA) of SN74LVC245ADWG4 in the SOIC-20 (DW) package is 78°C/W, measured per JESD51-7. This value assumes standard JEDEC 2S2P test board conditions and confirms superior heat dissipation versus TSSOP (83.6°C/W) and VQFN (108.1°C/W) variants - making SN74LVC245ADWG4 preferred for thermally demanding applications with limited airflow.
Is SN74LVC245ADWG4 pin-compatible with other members of the SN74LVC245A family?
Yes, SN74LVC245ADWG4 shares identical pinout and functionality with all SN74LVC245A variants across SOIC, SSOP, TSSOP, TVSOP, PDIP, and VQFN packages - including SN74LVC245APWRG4 and SN74LVC245ARGYRG4. Pin numbering, signal mapping (DIR, OE, A1–A8, B1–B8, GND, VCC), and electrical behavior are fully consistent, enabling drop-in substitution when package constraints allow.
SN74LVC245ADWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-SOIC
SN74LVC245ADWG4 FAQ
1.How can I place an order for SN74LVC245ADWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC245ADWG4 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 SN74LVC245ADWG4 reliable?
The price and inventory of SN74LVC245ADWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC245ADWG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC245ADWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC245ADWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC245ADWG4?
SN74LVC245ADWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC245ADWG4 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 SN74LVC245ADWG4?
For technical support, including SN74LVC245ADWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC245ADWG4 requirements.
6.How does Aetrix verify that SN74LVC245ADWG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC245ADWG4 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 SN74LVC245ADWG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC245ADWG4?
All SN74LVC245ADWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC245ADWG4, 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 SN74LVC245ADWG4 part is unused and in its original packaging.
Return procedure for SN74LVC245ADWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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