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Texas Instruments SN74LVC245APWE4
- Part No.:
- SN74LVC245APWE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC245APWE4.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,146
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Product details
Overview
SN74LVC245APWE4 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 domains. It supports mixed-mode I/O (5.5-V-tolerant inputs at 3.3-V VCC), delivers 24-mA output drive at 3.0-V supply, achieves 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 SN74LVC245APWE4 datasheet, SN74LVC245APWE4 pinout, SN74LVC245APWE4 application, or SN74LVC245APWE4 equivalent, key selection criteria include voltage translation capability (5 V ↔ 3.3 V/1.8 V), 20-pin TSSOP package compatibility, 3-state bus isolation timing (ten/tdis ≤ 8.5 ns), and Ioff-enabled system-level hot-swap safety.
Technical Context
The SN74LVC245APWE4 implements dual-directional 8-bit data flow controlled by DIR (direction) and OE (output enable) logic inputs. Its CMOS design enables rail-to-rail input tolerance up to 5.5 V independent of VCC, allowing seamless interfacing between 5-V legacy peripherals and 3.3-V or 1.8-V microcontrollers. The device uses a true 3-state output architecture with simultaneous high-impedance assertion on all eight channels when OE is high.
It incorporates Ioff circuitry that disables outputs and blocks current backflow during power-down, meeting JESD78 latch-up immunity (>250 mA) and JESD22 ESD robustness (2000-V HBM, 1000-V CDM). Propagation delay is load-dependent and specified down to 3.8 ns (typ) at 3.3 V with 30-pF load.
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 level shifters. |
| Input Voltage Tolerance | Up to 5.5 V - Allows direct connection to 5-V GPIOs or address/data buses without external clamping. |
| Max tpd @ 3.3 V | 6.3 ns - Supports >80-MHz bus toggle rates in point-to-point or lightly loaded stubbed topologies. |
| IOL / IOH | 24 mA sink / 24 mA source at 3.0 V - Drives standard 50-Ω PCB traces or multiple 74LVC inputs with margin. |
| Ioff Current | ±20 μA max at VCC = 0 V - Prevents damaging back-current during hot-plug or staggered power sequencing. |
| ESD Rating | 2000-V HBM, 1000-V CDM - Meets industrial-grade handling requirements without special ESD protocols. |
| Operating Temp | –40°C to +125°C - Qualified for under-hood automotive, base station, and industrial control environments. |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 0.65-mm lead pitch, exposed pad optional, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control: HIGH → A→B data flow; LOW → B→A data flow; referenced to VCC. |
| 2–9 | A1–A8 | Port A bidirectional I/O pins - connect to microcontroller or FPGA data bus side A. |
| 11–18 | B1–B8 | Port B bidirectional I/O pins - connect to peripheral, memory, or display driver bus side B. |
| 19 | OE | Active-low 3-state enable: LOW → transceiver enabled; HIGH → all A/B pins in high-Z state. |
| 10 | GND | Digital ground reference - must be low-inductance connection to system ground plane. |
| 20 | VCC | Power supply input - requires local 0.1-μF ceramic bypass capacitor placed ≤2 mm from pin. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-voltage I/O | 5.5-V-tolerant inputs operate reliably at any VCC from 1.65 V to 3.6 V - eliminates external voltage translators in 5-V/3.3-V boundary applications. |
| Ioff partial-power-down | Blocks current flow when VCC = 0 V - enables safe live insertion into powered backplanes or hot-swap modules without risk of bus contention damage. |
| High-drive 3-state outputs | 24-mA drive strength at 3.0 V supports driving longer PCB traces, heavier capacitive loads (≤50 pF), or fan-out to ≥10 LVC inputs. |
| Low ground bounce (VOLP) | <0.8 V typical at VCC = 3.3 V - reduces noise coupling into adjacent analog or clock signals during simultaneous switching. |
| Fast enable/disable timing | ten ≤ 8.5 ns, tdis ≤ 8.5 ns at 3.3 V - ensures clean bus arbitration in time-critical DMA or burst-transfer protocols. |
Applications
| LED Display Driver Interface | Industrial Backplane Isolation |
|---|---|
|
Use Scenario: Driving 8-bit segment or column data from a 3.3-V MCU to a 5-V LED display module with common-anode configuration. IC Role / Device Role / Timing Role: Bidirectional level-translating bus buffer enabling MCU-controlled write-only data transfer with 3-state isolation during display refresh blanking intervals. Use Value: Eliminates discrete MOSFET translators; withstands 5-V display supply while operating from 3.3-V rail; supports 100-Hz+ multiplex rates via sub-7-ns propagation delay. |
Use Scenario: Isolating control bus between hot-swappable I/O modules and a central 3.3-V controller in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Direction-controlled data path with Ioff-enabled power-down safety - DIR set statically per module, OE toggled during insertion/removal sequences. Use Value: Prevents back-driving of powered controller bus during module insertion; maintains signal integrity across 20-cm backplane runs using 24-mA drive capability. |
| Telecom Line Card Bridging | Motor Control I/O Expansion |
|
Use Scenario: Interfacing a 1.8-V FPGA-based packet processor to legacy 3.3-V PHY interface chips on a line card. IC Role / Device Role / Timing Role: Asynchronous bidirectional bridge supporting full-duplex register read/write cycles with precise 3-state control synchronized to FPGA clock domain. Use Value: Enables voltage-domain bridging without timing skew; 6.3-ns tpd meets 100-MHz register access timing budgets; 5.5-V input tolerance accommodates PHY overshoot. |
Use Scenario: Expanding GPIO count of a 3.3-V motor driver MCU to manage 8-channel enable/control signals for stepper/servo drivers. IC Role / Device Role / Timing Role: Unidirectional (A→B) buffered output expander with OE-gated shutdown - DIR fixed HIGH, OE controlled by MCU for group-enable sequencing. Use Value: Provides 24-mA per channel to directly drive optocoupler inputs or small-signal MOSFET gates; Ioff prevents leakage when MCU resets or powers down. |
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, TSSOP-20 tape-and-reel (2000 pcs) vs. tube (70 pcs); identical electrical specs and marking (LC245A). | No functional difference - selected when volume procurement or automated placement is required. | Choose SN74LVC245APWR for SMT production lines; SN74LVC245APWE4 suits prototyping, low-volume builds, or manual assembly. |
| 74LVC245ABQ | Nexperia variant in DHVQFN20 (4.5 × 3.5 mm); same VCC range and I/O specs but different thermal resistance (RθJA = 44.0°C/W vs. 83.6°C/W for PW). | Superior power density and thermal performance in space-constrained designs; requires rework of layout and stencil. | Choose 74LVC245ABQ only when board area or junction temperature budget is critical; not drop-in compatible due to QFN footprint. |
Compared with SN74LVC245APWR, SN74LVC245APWE4 offers identical functionality in a tube-packaged form ideal for evaluation and low-run manufacturing; versus 74LVC245ABQ, it trades smaller footprint for simpler assembly and broader distributor availability in TSSOP.
Availability
SN74LVC245APWE4 is available at Aetrix Electronics and suitable for LED display interfaces, industrial backplane isolation, and telecom line card bridging requiring stable component supply across automotive (-40°C to +125°C) and industrial temperature grades.
Supply support for SN74LVC245APWE4 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 over 50 years of innovation in logic and interface ICs.
The SN74LVC245A series belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for robust mixed-voltage interoperability, low dynamic power, and high-noise-immunity bus interfacing in industrial and communications systems.
FAQ
What is the maximum input voltage the SN74LVC245APWE4 can tolerate?
The SN74LVC245APWE4 accepts input voltages up to 5.5 V regardless of VCC level - confirmed in the Recommended Operating Conditions table. This allows direct interfacing with 5-V TTL or CMOS outputs while operating from 1.65–3.6-V supplies. Exceeding 5.5 V risks permanent damage per Absolute Maximum Ratings.
Does the SN74LVC245APWE4 support true bidirectional data flow?
Yes, the SN74LVC245APWE4 supports true bidirectional data flow via its DIR pin: when DIR = HIGH, data propagates from A-port to B-port; when DIR = LOW, data flows from B-port to A-port. This is explicitly defined in the Function Table (Table 1) and verified in the Functional Block Diagram.
Can the SN74LVC245APWE4 be used for level translation between 5-V and 1.8-V systems?
Yes, the SN74LVC245APWE4 supports down-translation from 5-V inputs to 1.8-V outputs - validated in Feature Description section 9.3 and supported by its 5.5-V input tolerance and 1.65–3.6-V VCC range. Output VOH/VOL levels meet 1.8-V logic thresholds when VCC = 1.8 V (min), per Electrical Characteristics tables.
What is the purpose of the Ioff feature in the SN74LVC245APWE4?
The Ioff feature disables all outputs and blocks current flow when VCC = 0 V, preventing back-current from live system buses into a powered-down SN74LVC245APWE4. This is critical for hot-swap applications and is tested per JESD78, with Ioff ≤ ±20 μA at VI/VO = 5.5 V and VCC = 0 V.
Is the SN74LVC245APWE4 pin-compatible with other packages of the same part number?
Yes - the SN74LVC245APWE4 (TSSOP-20) shares identical pin numbering and function mapping with all other SN74LVC245A variants in DB, DGV, DW, N, NS, and RGY packages, as confirmed in the Pin Configuration and Functions section and Package Option Addendum. Signal names (DIR, OE, A1–A8, B1–B8, GND, VCC) align across all 20-pin configurations.
SN74LVC245APWE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
SN74LVC245APWE4 FAQ
1.How can I place an order for SN74LVC245APWE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC245APWE4 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 SN74LVC245APWE4 reliable?
The price and inventory of SN74LVC245APWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC245APWE4 is usually 5 days.
3.What payment methods are accepted for SN74LVC245APWE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC245APWE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC245APWE4?
SN74LVC245APWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC245APWE4 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 SN74LVC245APWE4?
For technical support, including SN74LVC245APWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC245APWE4 requirements.
6.How does Aetrix verify that SN74LVC245APWE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC245APWE4 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 SN74LVC245APWE4 meets industry standards.
7.What is the process for return or replacement of SN74LVC245APWE4?
All SN74LVC245APWE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC245APWE4, 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 SN74LVC245APWE4 part is unused and in its original packaging.
Return procedure for SN74LVC245APWE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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