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Texas Instruments SN74LVC245APWRG3
- Part No.:
- SN74LVC245APWRG3
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC245APWRG3.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,649
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Product details
Overview
SN74LVC245APWRG3 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 signal operation (5-V inputs with 3.3-V VCC), delivers 6.3 ns max propagation delay at 3.3 V, and features Ioff for live insertion and partial-power-down protection - used in LED display drivers and telecom infrastructure backplanes.
For engineers reviewing the SN74LVC245APWRG3 datasheet, SN74LVC245APWRG3 pinout, SN74LVC245APWRG3 application, or SN74LVC245APWRG3 equivalent, key selection criteria include its 20-pin TSSOP package, direction-control (DIR) and output-enable (OE) logic interface, ±24 mA output drive at 3 V, overvoltage-tolerant inputs up to 5.5 V, and guaranteed operation from –40°C to +125°C.
Technical Context
The SN74LVC245APWRG3 implements a dual-bus, bidirectional transceiver architecture with independent DIR and OE control signals. Its CMOS design enables voltage translation across 1.65–3.6 V supply ranges while maintaining TTL-compatible thresholds and supporting 5-V input tolerance on all A/B ports.
It operates in three functional modes: A→B data flow (DIR = high, OE = low), B→A data flow (DIR = low, OE = low), and high-impedance isolation (OE = high). The Ioff circuitry actively disables outputs during power-down, preventing back-drive current and enabling hot-swap capability in modular systems.
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 logic families without level shifters |
| Max tpd | 6.3 ns at 3.3 V - ensures sub-7-ns timing margin for high-speed parallel bus interfaces up to ~100 MHz |
| IOL / IOH | ±24 mA at VCC = 3 V - drives heavy capacitive loads (e.g., long PCB traces or multiple inputs) without external buffers |
| Input Voltage Range | 0 V to 5.5 V - allows direct connection to 5-V microcontrollers or legacy peripherals in mixed-voltage systems |
| Ioff Current | ±20 μA at VI/VO = 5.5 V - blocks damaging back-current during partial power-down, critical for hot-plug I/O expanders |
| ESD Rating | 2000-V HBM, 1000-V CDM - meets industrial-grade robustness requirements for board-level handling and field operation |
| Operating Temp | –40°C to +125°C - qualified for automotive under-hood, industrial motor control, and telecom base station environments |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 0.65 mm pitch, lead finish Sn (matte tin), MSL Level-1, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | High = A→B data flow; Low = B→A data flow - enables dynamic bus arbitration in master/slave configurations |
| 2–9 (A1–A8) | Port A I/O | Bidirectional data pins tied to one bus domain (e.g., MCU side); tolerate 5.5-V inputs regardless of VCC |
| 10 (GND) | Ground reference | Primary return path for all I/O and supply currents; must be low-inductance connection to minimize ground bounce |
| 11–18 (B1–B8) | Port B I/O | Bidirectional data pins tied to second bus domain (e.g., peripheral side); electrically identical to A-port pins |
| 19 (OE) | Output enable input | Active-low; forces all A/B pins into high-impedance state when high - isolates buses during reset or fault conditions |
| 20 (VCC) | Power supply | Single 1.65–3.6-V supply powering internal logic and output drivers; requires local 0.1-μF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | Supports 5-V inputs with 3.3-V VCC - eliminates need for discrete level translators in 3.3-V/5-V system interconnects |
| Ioff partial-power-down protection | Prevents current backflow when VCC = 0 V - enables safe live insertion of daughter cards or hot-swappable modules |
| Low ground bounce (VOLP < 0.8 V) | Reduces noise coupling into adjacent signals during simultaneous switching - improves signal integrity in dense PCB layouts |
| Fast propagation delay (6.3 ns @ 3.3 V) | Enables reliable timing closure in high-throughput parallel interfaces such as memory-mapped I/O or FPGA-to-peripheral bridges |
| Latch-up immunity > 250 mA | Guarantees robust operation under transient overvoltage or ESD events - exceeds JEDEC JESD17 requirements |
Applications
| LED Display Driver Interface | Industrial I/O Expander |
|---|---|
Use Scenario: Driving multiplexed 7-segment or dot-matrix LED panels from a 3.3-V microcontroller with 5-V segment drivers. IC Role / Device Role / Timing Role: Bidirectional voltage translator and bus isolator - shifts MCU GPIO logic to 5-V sink current while blocking reverse current during blanking intervals. Use Value: Eliminates discrete MOSFET level shifters and reduces BOM count; ±24 mA drive directly powers common-anode LED segments without external transistors. |
Use Scenario: Extending GPIO count of PLC controllers via SPI/I²C port expanders, where local 5-V sensors connect to isolated 3.3-V host logic. IC Role / Device Role / Timing Role: Isolated bidirectional data bridge - synchronizes sensor read/write cycles between voltage domains while maintaining bus contention safety. Use Value: Ioff protection prevents damage during module replacement; 6.3 ns tpd ensures deterministic response in real-time I/O scanning loops. |
| Telecom Backplane Interconnect | Motor Control Logic Interface |
Use Scenario: Interfacing 3.3-V FPGA-based packet processors with legacy 5-V line-card management ASICs in modular telecom chassis. IC Role / Device Role / Timing Role: Hot-swap-capable bus transceiver - enables live firmware updates and field-replaceable unit (FRU) insertion without chassis power-down. Use Value: MSL Level-1 and –40°C to +125°C rating support extended thermal cycling; DIR/OE dual-control allows dynamic reconfiguration of data path direction. |
Use Scenario: Connecting 3.3-V motor driver ICs (e.g., DRV8876) to 5-V position encoder feedback lines in closed-loop servo systems. IC Role / Device Role / Timing Role: Directional signal conditioner - routes quadrature encoder A/B signals to controller while isolating noise from high-current motor phases. Use Value: 5.5-V input tolerance accepts encoder open-collector outputs pulled to 5 V; low VOLP minimizes jitter in edge-sensitive position decoding. |
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 | Same silicon, NIPDAU lead finish instead of matte tin (Sn); identical electrical specs and timing | No functional difference - selected when NIPDAU finish preferred for solderability or legacy process compatibility | Choose SN74LVC245APWR for standard RoHS-compliant assembly with NiPdAu plating; SN74LVC245APWRG3 is optimized for Sn-only processes requiring matte tin finish. |
| 74LVC245ADTR | STMicroelectronics variant; same 20-pin TSSOP package but slightly higher max tpd (7.5 ns @ 3.3 V) and lower IOL (±20 mA) | Marginally reduced drive strength and speed - suitable where load capacitance is < 20 pF and timing budget allows ≥1.2 ns slack | Use 74LVC245ADTR only if cost sensitivity outweighs need for TI's tighter 6.3 ns tpd and ±24 mA drive; verify layout for added propagation delay margin. |
Compared with SN74LVC245APWR and 74LVC245ADTR, the SN74LVC245APWRG3 provides the highest output drive and fastest propagation in its class, making it optimal for noise-sensitive, high-speed, or high-capacitance bus applications where timing margin and signal integrity are critical.
Availability
SN74LVC245APWRG3 is available at Aetrix Electronics and suitable for LED display drivers, industrial I/O expanders, and telecom backplane interconnects requiring stable component supply across extended temperature and mixed-voltage operating conditions.
Supply support for SN74LVC245APWRG3 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 expertise in logic interface solutions.
The SN74LVC245A product line was engineered for robust, low-voltage bidirectional bus interfacing in mixed-signal systems - targeting industrial automation, communications infrastructure, and automotive electronics where reliability and voltage translation are essential.
FAQ
What is the maximum operating voltage for inputs on the SN74LVC245APWRG3?
The SN74LVC245APWRG3 accepts input voltages up to 5.5 V on all A and B port 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 or level-shifting circuitry, and is explicitly specified in the Recommended Operating Conditions table of the TI datasheet SCAS218X.
Does the SN74LVC245APWRG3 support hot-swap or live-insertion applications?
Yes, the SN74LVC245APWRG3 supports live insertion via its Ioff feature, which disables outputs and limits off-state leakage to ±20 μA when VCC = 0 V. This prevents damaging back-current flow from powered buses into unpowered devices - a requirement verified in TI's characterization testing per JESD78 and documented in Section 9.3 of the SN74LVC245A datasheet.
What is the propagation delay of the SN74LVC245APWRG3 at 3.3 V?
The SN74LVC245APWRG3 has a maximum propagation delay (tpd) of 6.3 ns at VCC = 3.3 V ± 0.3 V and TA = 25°C, as measured under standard load conditions (CL = 50 pF). This value is confirmed in Table 7.6 (Switching Characteristics) of the official TI datasheet SCAS218X and applies to both A→B and B→A signal paths.
Can the SN74LVC245APWRG3 be used for voltage translation between 5-V and 1.8-V logic domains?
Yes, the SN74LVC245APWRG3 supports down-translation from 5-V inputs to 1.8-V outputs, as confirmed in Section 9.3 ("Feature Description") of the datasheet. When VCC = 1.8 V, inputs up to 5.5 V are safely accepted, and output VOH/VOL levels comply with 1.8-V logic thresholds - enabling interoperability without external translators.
What package type and dimensions does the SN74LVC245APWRG3 use?
The SN74LVC245APWRG3 uses a 20-pin TSSOP (PW) package with body dimensions of 6.50 mm × 4.40 mm and 0.65 mm lead pitch. Its matte tin (Sn) lead finish and MSL Level-1 rating are specified in TI's Package Option Addendum, confirming suitability for standard surface-mount reflow processes without moisture sensitivity concerns.
SN74LVC245APWRG3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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-TSSOP
SN74LVC245APWRG3 FAQ
1.How can I place an order for SN74LVC245APWRG3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC245APWRG3 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 SN74LVC245APWRG3 reliable?
The price and inventory of SN74LVC245APWRG3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC245APWRG3 is usually 5 days.
3.What payment methods are accepted for SN74LVC245APWRG3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC245APWRG3 transactions.
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4.How is shipping managed for SN74LVC245APWRG3?
SN74LVC245APWRG3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC245APWRG3 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 SN74LVC245APWRG3?
For technical support, including SN74LVC245APWRG3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC245APWRG3 requirements.
6.How does Aetrix verify that SN74LVC245APWRG3 is sourced from the original manufacturer or authorized distributors?
All SN74LVC245APWRG3 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 SN74LVC245APWRG3 meets industry standards.
7.What is the process for return or replacement of SN74LVC245APWRG3?
All SN74LVC245APWRG3 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC245APWRG3, 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 SN74LVC245APWRG3 part is unused and in its original packaging.
Return procedure for SN74LVC245APWRG3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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