My Inquiry
My Account
Texas Instruments SN74LVT245PWLE
- Part No.:
- SN74LVT245PWLE
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74LVT245PWLE.pdf
- Description:
- BUS TRANSCEIVER
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LVT245PWLE from Texas Instruments is a 3.3-V ABT octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between 3.3-V and 5-V systems. It features direction control (DIR), output enable (OE), hot-insertion support via Ioff and power-up 3-state, and operates from 2.7 V to 3.6 V. Used in mixed-voltage motherboard interconnects and legacy-to-modern bus bridging.
For engineers reviewing the SN74LVT245PWLE datasheet, SN74LVT245PWLE pinout, SN74LVT245PWLE application, or SN74LVT245PWLE equivalent, key selection criteria include its 20-pin TSSOP package, ±100 µA Ioff at VCC = 0 V, 3.5 ns max propagation delay at 3.3 V, 64 mA IOL drive strength, and compatibility with TTL-level inputs while powered from 3.3 V.
Technical Context
This device implements an advanced biCMOS ABT (Advanced BiCMOS Technology) architecture enabling simultaneous 3.3-V core operation and 5-V tolerant I/O. Its DIR input selects data flow direction (A→B or B→A), while OE independently places all outputs in high-impedance state-critical for bus arbitration and isolation.
The transceiver integrates Ioff circuitry that disables outputs during power-down to prevent backflow current, and power-up 3-state logic that holds outputs high-Z until VCC stabilizes. Latch-up immunity exceeds 100 mA per JESD 78 Class II, and ESD protection meets 2000-V HBM, 200-V MM, and 1000-V CDM standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery operation down to 2.7 V without functional degradation. |
| IOL / IOH | 64 mA / −32 mA - drives standard TTL loads directly; enables fanout of ≥10 LVTTL gates. |
| tPLH / tPHL | 1.2–3.5 ns (VCC = 3.3 V) - ensures sub-4 ns propagation for high-speed bus handshaking in 50-MHz+ systems. |
| Ioff | ±100 µA at VCC = 0 V - prevents damaging current backflow during hot insertion or partial power-down. |
| VIH / VIL | 2.0 V / 0.8 V - accepts standard TTL logic levels while operating on 3.3-V supply, enabling seamless 5-V/3.3-V interface. |
| VOH / VOL | 2.4 V min / 0.55 V max (IOL = 64 mA) - maintains noise margins >0.4 V under full load for robust signal integrity. |
| θJA (PW) | 83°C/W - defines thermal derating limit for continuous operation in compact PCB layouts with minimal copper pour. |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height, lead-free (RoHS-compliant) CU NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | Low = B→A data flow; High = A→B data flow; TTL-compatible threshold enables direct connection to 5-V controllers. |
| 2–9 (A1–A8) | Bus A Data Inputs/Outputs | Bidirectional I/O port tied to local 3.3-V subsystem; 5-V tolerant when driven externally. |
| 10 (GND) | Ground Reference | Primary return path for all I/O and internal logic; must be low-inductance connection to minimize ground bounce (VOLP < 0.8 V). |
| 11 (VCC) | Supply Voltage | 3.3-V nominal supply; supports 2.7–3.6 V range; decoupling capacitor required within 10 mm for stable switching. |
| 12 (OE) | Output Enable Input | Active-Low; ties to VCC via pullup resistor during power-up to ensure high-Z state before initialization. |
| 13–20 (B1–B8) | Bus B Data Inputs/Outputs | Bidirectional I/O port interfacing to 5-V legacy bus; withstands 5.5-V inputs regardless of VCC state. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5-V input/output tolerance with 3.3-V VCC enables direct interface between legacy 5-V peripherals and modern 3.3-V processors without level shifters. |
| Hot-insertion support | Ioff + power-up 3-state eliminates bus contention and backfeed current during live board replacement in telecom and server backplanes. |
| Low ground bounce | VOLP < 0.8 V at 3.3 V/25°C ensures signal integrity in high-density routing where shared ground paths induce noise. |
| Latch-up immunity | Exceeds 100 mA per JESD 78 Class II - prevents destructive latch-up during voltage transients or ESD events. |
| ESD robustness | 2000-V HBM, 200-V MM, 1000-V CDM ratings allow handling in standard assembly environments without special precautions. |
Applications
| Industrial PLC Backplane Interface | Embedded Computing Memory Expansion |
|---|---|
Use Scenario: Connecting a 3.3-V ARM-based controller to legacy 5-V ISA-style I/O modules in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional voltage-translating bus transceiver managing address/data strobes with sub-4 ns timing alignment. Use Value: Eliminates discrete level-shifter components and reduces BOM count by enabling direct 5-V/3.3-V bus coupling with guaranteed signal integrity. | Use Scenario: Expanding DDR SDRAM address/data bus in a 3.3-V industrial computer using older 5-V memory modules. IC Role / Device Role / Timing Role: Octal transceiver isolating and translating control signals (RAS#, CAS#, WE#) between memory controller and DIMM slot. Use Value: Maintains 5-V timing margins while operating from 3.3-V rail, avoiding timing skew introduced by external translators. |
| Test Equipment Signal Routing | Automotive Diagnostic Gateway |
Use Scenario: Reconfigurable signal path in automated test equipment switching between 3.3-V FPGA I/O banks and 5-V DUT interfaces. IC Role / Device Role / Timing Role: Direction-controlled bus buffer enabling dynamic A↔B data routing under software control with deterministic latency. Use Value: Provides repeatable 3.5 ns max propagation delay across temperature, critical for time-critical stimulus-response validation. | Use Scenario: Bridging CAN microcontroller (3.3-V) to legacy 5-V OBD-II diagnostic port in vehicle service tools. IC Role / Device Role / Timing Role: Isolating and level-translating UART or parallel diagnostic bus lines during firmware updates. Use Value: Ioff protection prevents backfeed into powered-down CAN transceivers during hot-plug diagnostics, ensuring system safety. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245AQPWRQ1 | Automotive-grade (AEC-Q100), 1.65–3.6 V VCC range, lower drive (24 mA IOL), no 5-V tolerance on outputs. | Requires external clamping for 5-V bus connections; suited for 3.3-V-only automotive domains. | Select when automotive qualification and extended temperature (−40°C to 125°C) are mandatory, and 5-V bus interfacing is not required. |
| SN74ALVC164245DLR | 16-bit dual-supply translator (1.65–3.6 V A-side, 2.3–3.6 V B-side), no 5-V tolerance, higher pin count (48-pin SSOP). | Designed for 3.3-V ↔ 2.5-V or 1.8-V translation; lacks mixed-voltage 5-V I/O capability. | Choose for multi-voltage SoC interconnects where precise dual-rail control is needed, not for 5-V legacy interface. |
Compared with SN74LVT245PWLE, SN74LVC245AQPWRQ1 trades 5-V I/O tolerance and 64 mA drive for automotive qualification and wider VCC flexibility, while SN74ALVC164245DLR offers scalable channel count and dual-supply precision but cannot replace 5-V bus coupling functionality.
Availability
SN74LVT245PWLE is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded computing memory expansion, test equipment signal routing, and automotive diagnostic gateways requiring stable component supply across extended temperature ranges.
Supply support for SN74LVT245PWLE 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 logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74LVT245PWLE belongs to TI's ABT logic family, engineered for high-speed, mixed-voltage bus interfacing in systems transitioning from 5-V to 3.3-V architectures while maintaining backward compatibility.
FAQ
What is the maximum operating temperature range for SN74LVT245PWLE?
The SN74LVT245PWLE is specified for operation from −40°C to +85°C ambient temperature. This range is validated per the recommended operating conditions in the official datasheet SCES004H, and applies to all electrical and switching characteristics including propagation delay, drive strength, and Ioff performance. The TSSOP-20 (PW) package's 83°C/W thermal resistance supports reliable operation within this range when PCB layout follows TI's thermal guidelines.
Does SN74LVT245PWLE support hot insertion, and how is it implemented?
Yes, SN74LVT245PWLE supports hot insertion through two integrated features: Ioff circuitry disables outputs when VCC = 0 V (±100 µA leakage), preventing backflow current into powered-down systems; and power-up 3-state logic holds all outputs in high-impedance until VCC reaches valid operating voltage. These functions are fully characterized per JEDEC standards and require no external components-only proper OE pullup during power sequencing.
Can SN74LVT245PWLE interface a 5-V microcontroller with a 3.3-V FPGA?
Yes, SN74LVT245PWLE is explicitly designed for this use case. Its inputs tolerate 5.5-V signals regardless of VCC state, and its outputs swing to 3.3-V logic levels with 64 mA drive strength-compatible with FPGA I/O banks configured for LVTTL or LVCMOS33. The DIR and OE pins allow full software control of data direction and bus isolation, making it ideal for bidirectional control register access between heterogeneous devices.
What is the recommended power-up sequence for SN74LVT245PWLE?
The recommended power-up sequence for SN74LVT245PWLE is to assert OE high (via pullup to VCC) before applying VCC, ensuring outputs remain in high-impedance until supply stabilizes. TI specifies a minimum pullup resistor value based on driver sink capability; a 10-kΩ resistor is typical. No sequencing is required between A- and B-side buses, as the device tolerates 5-V inputs before VCC ramps, satisfying hot-insertion requirements without external logic.
Is SN74LVT245PWLE pin-compatible with other packages in the SN74LVT245B family?
Yes, SN74LVT245PWLE shares identical pinout and function mapping with all 20-pin variants of the SN74LVT245B family-including DB (SSOP), DW (SOIC), NS (SO), and RGY (VQFN). Pin 1 is DIR, pins 2–9 are A1–A8, pin 10 is GND, pin 11 is VCC, pin 12 is OE, and pins 13–20 are B1–B8. This uniformity allows drop-in replacement across packages when thermal or board-space constraints change, provided solder-reflow profiles match the respective package's MSL rating.
SN74LVT245PWLE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74LVT245PWLE FAQ
1.How can I place an order for SN74LVT245PWLE through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVT245PWLE 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 SN74LVT245PWLE reliable?
The price and inventory of SN74LVT245PWLE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVT245PWLE is usually 5 days.
3.What payment methods are accepted for SN74LVT245PWLE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVT245PWLE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVT245PWLE?
SN74LVT245PWLE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVT245PWLE 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 SN74LVT245PWLE?
For technical support, including SN74LVT245PWLE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVT245PWLE requirements.
6.How does Aetrix verify that SN74LVT245PWLE is sourced from the original manufacturer or authorized distributors?
All SN74LVT245PWLE 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 SN74LVT245PWLE meets industry standards.
7.What is the process for return or replacement of SN74LVT245PWLE?
All SN74LVT245PWLE units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVT245PWLE, 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 SN74LVT245PWLE part is unused and in its original packaging.
Return procedure for SN74LVT245PWLE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LVT245PWLE Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
