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Texas Instruments SN74LVC245APWR
- Part No.:
- SN74LVC245APWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC245APWR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:20,510
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Product details
Overview
SN74LVC245APWR 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 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 server backplane interfaces.
For engineers reviewing the SN74LVC245APWR datasheet, SN74LVC245APWR pinout, SN74LVC245APWR application, or SN74LVC245APWR equivalent, key selection criteria include voltage translation capability (5 V → 3.3 V/1.8 V), 3-state output control via DIR/OE, thermal performance in TSSOP-20, and Ioff-enabled back-drive protection during power sequencing.
Technical Context
The SN74LVC245APWR implements dual-directional 8-bit data flow controlled by a single DIR input: high enables A→B transmission, low enables B→A. Output enable (OE) independently places all outputs in high-impedance state, isolating buses without affecting internal logic states.
Its CMOS design supports overvoltage-tolerant inputs up to 5.5 V across the full 1.65–3.6 V VCC range, enabling robust level-shifting in mixed-voltage systems. The device meets JESD 17 latch-up immunity (>250 mA) and exceeds JESD 22 ESD ratings (2000-V HBM, 1000-V CDM).
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 domains |
| Max tpd | 6.3 ns at 3.3 V - ensures timing compliance in high-speed bus interfaces up to ~100 MHz |
| Input Voltage Tolerance | Up to 5.5 V - allows direct connection to 5-V peripherals without external level shifters |
| Ioff Current | ±10 μA at VCC = 0 V - prevents damaging current backflow during hot-swap or partial power-down |
| Output Drive | ±24 mA at VCC = 3.0 V - drives moderate capacitive loads (e.g., 15-cm PCB traces + 30-pF load) |
| ESD Rating | 2000-V HBM - meets industrial handling requirements without special ESD precautions beyond standard protocols |
| Operating Temp | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
TSSOP-20 package (6.50 mm × 4.40 mm body size), 0.65-mm lead pitch, RoHS-compliant NIPDAU/SN lead finish, 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 one bus segment; tolerate 5.5-V inputs regardless of VCC |
| 10 (GND) | Ground Reference | Primary return path for all I/O and core logic; must be low-inductance connection |
| 11–18 (B1–B8) | Port B I/O | Bidirectional data pins tied to second bus segment; electrically identical to A-side |
| 19 (OE) | Output Enable Input | Active-low control: OE = low enables transceiver; OE = high forces all A/B pins to high-Z |
| 20 (VCC) | Power Supply | Single supply for core logic and I/O; requires local 0.1-μF bypass capacitor per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-voltage interface | Enables 5-V microcontrollers to drive 3.3-V FPGAs or memory without discrete translators |
| Live-insertion support | Ioff circuitry blocks reverse current when VCC = 0 V, allowing safe board replacement in powered-backplane systems |
| Low ground bounce | Typical VOLP < 0.8 V at VCC = 3.3 V - reduces noise coupling into adjacent analog or RF sections |
| Fast edge control | Δt/Δv ≤ 10 ns/V - limits slew-induced EMI while maintaining signal integrity on 50-Ω traces |
| Thermal robustness | RθJA = 83.6°C/W in TSSOP-20 - supports continuous 8-bit switching at ambient ≤ 85°C with minimal derating |
Applications
| LED Display Driver Interface | Server Backplane Data Buffer |
|---|---|
Use Scenario: Driving 8-bit column data to multiplexed 16×16 LED matrix with 5-V MCU controller and 3.3-V display driver IC. IC Role / Device Role / Timing Role: Bidirectional level translator and bus isolator; DIR selects MCU-to-driver or driver-status-read mode; OE synchronizes blanking intervals. Use Value: Eliminates need for eight discrete MOSFET level shifters; 6.3-ns tpd ensures pixel update timing meets 1-kHz refresh constraints. | Use Scenario: Isolating PCIe configuration bus between hot-pluggable mezzanine card and host motherboard operating at different supply voltages. IC Role / Device Role / Timing Role: Asynchronous bus transceiver; OE asserts during card insertion/removal to prevent bus contention; DIR adapts to read/write command direction. Use Value: Ioff protection prevents back-drive damage during partial power-down; –40°C to +125°C rating supports extended chassis thermal profiles. |
| Industrial I/O Expander Link | Telecom Line Card Voltage Translator |
Use Scenario: Connecting 3.3-V ARM-based PLC CPU to legacy 5-V digital I/O modules via ribbon cable with 40-pF/m capacitance. IC Role / Device Role / Timing Role: High-drive bus buffer; ±24-mA outputs overcome trace capacitance; DIR set statically for CPU→I/O direction. Use Value: 24-mA drive sustains signal integrity over 30-cm cables; 5.5-V input tolerance avoids external clamping diodes. | Use Scenario: Interfacing 1.8-V baseband processor to 3.3-V line interface unit (LIU) in DSLAM equipment requiring precise voltage domain separation. IC Role / Device Role / Timing Role: Down-voltage translator; operates at VCC = 1.8 V to translate 3.3-V LIU signals to processor; OE synchronized to frame sync pulses. Use Value: Supports 5-V→1.8-V and 3.3-V→1.8-V translation per TI Feature Description; eliminates separate LDO + level shifter chain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC245ADW | SOIC-20 package (12.8 mm × 7.5 mm); RθJA = 78°C/W; tube packaging (25 pcs) | Better thermal dissipation but larger footprint; suited for prototyping or low-volume manual assembly | Select when board space permits larger package and thermal margin >15°C is required at full 8-bit toggle rate |
| SN74AVC245DBVR | Wider VCC range (1.2 V to 3.6 V); lower drive (±12 mA); higher speed (tpd = 3.2 ns @ 1.8 V) | Optimized for ultra-low-voltage mobile interfaces; not 5-V tolerant - requires external clamping for legacy 5-V signals | Select only for new 1.2–1.8-V designs where 5-V compatibility is unnecessary and sub-4-ns timing is critical |
Compared with SN74LVC245APWR, the SOIC-20 74LVC245ADW offers superior thermal performance but consumes 2.4× more board area, while the SN74AVC245DBVR enables next-gen low-voltage operation at the cost of losing 5-V input tolerance - making SN74LVC245APWR the optimal choice for mixed-voltage industrial and telecom infrastructure where robustness and compatibility are prioritized.
Availability
SN74LVC245APWR is available at Aetrix Electronics and suitable for LED display drivers, server backplane buffers, and industrial I/O expanders requiring stable component supply across automotive (-40°C to +125°C) and industrial temperature grades.
Supply support for SN74LVC245APWR 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 and embedded processing solutions, with over 90 years of innovation in precision analog, power management, and logic devices.
The SN74LVC245A product line targets robust, voltage-flexible bus interfacing in mixed-signal systems - engineered specifically for reliability in industrial automation, telecom infrastructure, and computing platforms where interoperability across legacy and modern logic families is essential.
FAQ
What is the maximum input voltage the SN74LVC245APWR can tolerate?
The SN74LVC245APWR 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 logic without external protection components, as confirmed in Section 7.3 (Recommended Operating Conditions) and Section 9.1 (Overview) of the SCAS218X datasheet.
Does the SN74LVC245APWR support hot-swap or live-insertion applications?
Yes, the SN74LVC245APWR supports live insertion via its Ioff feature: when VCC = 0 V, Ioff limits input/output leakage to ±10 μA, preventing damaging back-current flow from powered buses into the unpowered device. This behavior is explicitly verified in Section 7.5 (Electrical Characteristics) and Section 9.1 (Overview) of the official TI datasheet.
What is the propagation delay of the SN74LVC245APWR at 3.3 V?
The SN74LVC245APWR has a maximum propagation delay (tpd) of 6.3 ns at VCC = 3.3 V ± 0.3 V, TA = –40°C to +125°C, as specified in Section 7.6 (Switching Characteristics) of the SCAS218X datasheet. Typical tpd is 3.8 ns under same conditions, supporting reliable operation in 100-MHz bus systems with adequate setup/hold margins.
Which package type does the SN74LVC245APWR use, and what are its key mechanical dimensions?
The SN74LVC245APWR uses a TSSOP-20 package with body dimensions of 6.50 mm × 4.40 mm and 0.65-mm lead pitch. Its marking is "LC245A", and it carries MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH), per TI's Package Option Addendum dated 10-Nov-2025.
How does the DIR and OE pin functionality interact in the SN74LVC245APWR?
In the SN74LVC245APWR, DIR controls data direction (high = A→B, low = B→A), while OE enables/disables all outputs (low = active, high = high-impedance). When OE is high, both A and B ports enter high-Z regardless of DIR state - providing complete bus isolation. This functional relationship is defined in Table 1 (Function Table) of Section 9.4 (Device Functional Modes) in the datasheet.
SN74LVC245APWR 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
SN74LVC245APWR FAQ
1.How can I place an order for SN74LVC245APWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC245APWR 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 SN74LVC245APWR reliable?
The price and inventory of SN74LVC245APWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC245APWR is usually 5 days.
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SN74LVC245APWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC245APWR 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 SN74LVC245APWR?
For technical support, including SN74LVC245APWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC245APWR requirements.
6.How does Aetrix verify that SN74LVC245APWR is sourced from the original manufacturer or authorized distributors?
All SN74LVC245APWR 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 SN74LVC245APWR meets industry standards.
7.What is the process for return or replacement of SN74LVC245APWR?
All SN74LVC245APWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC245APWR, 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 SN74LVC245APWR part is unused and in its original packaging.
Return procedure for SN74LVC245APWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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