My Inquiry
My Account
Texas Instruments SN74LVC245APWG4
- Part No.:
- SN74LVC245APWG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC245APWG4.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,694
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LVC245APWG4 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 SN74LVC245APWG4 datasheet, SN74LVC245APWG4 pinout, SN74LVC245APWG4 application, or SN74LVC245APWG4 equivalent, key selection criteria include voltage translation capability (5 V ↔ 3.3 V), 20-pin TSSOP package compatibility, 3-state bus isolation behavior, and thermal performance under industrial temperature range (–40°C to 125°C).
Technical Context
The SN74LVC245APWG4 implements dual-bus bidirectional data flow controlled by a single DIR input: high enables A→B transmission, low enables B→A. Its OE input places all eight channels into high-impedance state, enabling bus isolation. The device supports mixed-mode signaling - inputs tolerate up to 5.5 V regardless of VCC (1.65–3.6 V), allowing safe interfacing between 5-V legacy logic and 3.3-V/1.8-V domains.
It incorporates Ioff circuitry that disables outputs during partial power-down, preventing back-drive current when VCC = 0 V. Latch-up performance exceeds 250 mA per JESD17, and ESD protection meets 2000-V HBM and 1000-V CDM standards - critical for robust operation in telecom infrastructure and motor driver control interfaces.
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 sources while powered from 3.3-V or lower supplies. |
| Max Propagation Delay | 6.3 ns at 3.3 V - supports high-speed bus communication up to ~150 MHz clock-equivalent rates. |
| Ioff Current | ±10 μA at VCC = 0 V - prevents damaging back-current during hot-swap or partial-power-down sequences. |
| Output Drive Strength | ±24 mA at VCC = 3.0 V - drives moderate capacitive loads (e.g., PCB traces, multiple CMOS inputs) without external buffers. |
| Operating Temperature | –40°C to +125°C - qualified for industrial and automotive under-hood applications requiring extended thermal margin. |
| ESD Rating | 2000-V HBM / 1000-V CDM - meets JEDEC standards for handling and board-level reliability in manufacturing environments. |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 0.65 mm lead pitch, surface-mount, RoHS-compliant NIPDAU finish, MSL Level-1 (260°C, unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | High = A→B data flow; Low = B→A - determines real-time bus direction without reset or configuration registers. |
| 19 (OE) | Output enable input | Low = transceiver active; High = all A/B ports in high-Z - enables dynamic bus arbitration and multi-drop sharing. |
| A1–A8 (Pins 2–9) | Port A I/O terminals | Bidirectional data lines tied to one bus segment; tolerate 5.5 V regardless of VCC setting. |
| B1–B8 (Pins 11–18) | Port B I/O terminals | Bidirectional data lines tied to second bus segment; electrically isolated from Port A when OE = high. |
| 10 (GND) | Ground reference | Primary return path for all I/O and internal logic; must be low-inductance connection for signal integrity. |
| 20 (VCC) | Power supply | Single supply for core logic and I/O; bypass capacitor (0.1 µF) required near pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| 5.5-V tolerant inputs | Enables seamless interface between 5-V microcontrollers and 3.3-V FPGAs without external level translators. |
| Ioff partial-power-down protection | Prevents current backflow when VCC is off, supporting hot-plug capability in modular I/O expansion systems. |
| Low ground bounce (VOLP < 0.8 V) | Maintains signal integrity during simultaneous switching of multiple outputs on shared PCB planes. |
| Fast enable/disable timing (ten/tdis ≤ 8.5 ns) | Allows rapid bus arbitration in time-critical applications like real-time sensor data aggregation. |
| Latch-up immunity > 250 mA | Ensures robustness against transient overvoltage events in industrial control environments. |
Applications
| LED Display Driver Interface | Industrial Network Switch Backplane |
|---|---|
Use Scenario: Driving multiplexed 7-segment or dot-matrix LED panels from a 3.3-V MCU while sourcing sink current from 5-V supply rails. IC Role / Device Role / Timing Role: Bidirectional voltage translator and bus buffer - isolates MCU GPIOs from higher-current display segments and translates logic levels. Use Value: Eliminates discrete level-shifter ICs and reduces BOM count; ±24 mA drive supports direct LED segment control without external drivers. | Use Scenario: Interfacing management ASICs (3.3-V) with legacy PHY modules (5-V) across backplane traces in enterprise switches. IC Role / Device Role / Timing Role: Asynchronous bus transceiver - enables protocol-agnostic data exchange between mismatched voltage domains on shared parallel control buses. Use Value: 6.3 ns tpd ensures timing closure across 15-cm backplane runs; Ioff prevents damage during PHY hot-swap maintenance. |
| Motor Control I/O Expansion | Embedded Telecom Baseband Interface |
Use Scenario: Extending GPIO count of a 1.8-V SoC to control 5-V relay banks and optocoupled feedback sensors in HVAC motor controllers. IC Role / Device Role / Timing Role: Level-translating I/O expander - provides galvanically isolated digital control paths with configurable direction per channel group. Use Value: 1.65-V minimum VCC allows direct integration with ultra-low-power SoCs; 125°C rating supports under-hood deployment. | Use Scenario: Bridging baseband processor (3.3-V) and analog front-end (5-V) in small-cell radio units requiring deterministic latency and ESD-hardened interconnects. IC Role / Device Role / Timing Role: Robust bus isolator - decouples noise-sensitive RF sections from digital control logic while maintaining signal fidelity. Use Value: 2000-V HBM rating withstands field-installation ESD events; low VOLP/VOHV minimizes jitter injection into clock distribution networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVCH245A | Higher drive (±32 mA), enhanced 5-V tolerance (up to 5.5 V), same pinout and VCC range. | Better suited for heavier capacitive loads or longer trace lengths where extra margin is needed. | Select when driving >10 pF per line or operating near 125°C with sustained load current. |
| 74ALVC245 | Lower ICC (1 μA typical), identical functional behavior, but rated only to 85°C ambient. | Targeted at commercial-grade consumer electronics with tighter power budgets and milder thermal profiles. | Choose for cost-sensitive, non-industrial designs where extended temperature range is not required. |
Compared with SN74LVCH245A and 74ALVC245, the SN74LVC245APWG4 offers balanced drive strength and full industrial temperature support in a widely available TSSOP-20 package - making it optimal for general-purpose mixed-voltage bus bridging where reliability and availability are prioritized over marginal speed or ultra-low quiescent current.
Availability
SN74LVC245APWG4 is available at Aetrix Electronics and suitable for LED displays, network switches, and motor drivers requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for SN74LVC245APWG4 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 deep expertise in logic, interface, and power management ICs.
The SN74LVC245A product line delivers robust, voltage-flexible bus transceivers for industrial, telecom, and computing applications - designed specifically to simplify mixed-voltage system integration and improve board-level reliability.
FAQ
What is the maximum operating voltage on the inputs of the SN74LVC245APWG4?
The SN74LVC245APWG4 inputs tolerate up to 5.5 V regardless of VCC level, enabling direct interfacing with 5-V logic families while powered from 1.65–3.6 V supplies. This overvoltage capability is specified across the full operating temperature range (–40°C to 125°C) and does not require external clamping diodes. The SN74LVC245APWG4 maintains this rating even when VCC = 0 V, supporting safe hot-insertion scenarios.
Does the SN74LVC245APWG4 support bidirectional data flow on all eight channels simultaneously?
Yes, the SN74LVC245APWG4 supports true bidirectional data flow across all eight A/B channel pairs, controlled globally by the DIR pin. When DIR = high, data flows A→B; when DIR = low, data flows B→A. All channels operate synchronously under this single control signal - no per-channel direction configuration is required. The SN74LVC245APWG4 does not support independent direction control per channel.
What is the recommended bypass capacitor for the VCC pin of the SN74LVC245APWG4?
A 0.1 µF ceramic capacitor is recommended directly adjacent to the VCC pin (Pin 20) of the SN74LVC245APWG4 to suppress high-frequency noise and stabilize supply voltage during fast output transitions. TI specifies this value for single-supply operation in the Power Supply Recommendations section. For systems with multiple VCC-connected devices, additional 0.01–0.022 µF capacitors may be paralleled to target higher-frequency noise components. The SN74LVC245APWG4 requires low-ESR placement within 2 mm of the pin for optimal performance.
Can the SN74LVC245APWG4 be used in hot-swap applications?
Yes, the SN74LVC245APWG4 supports hot-swap operation via its Ioff feature, which disables outputs and limits leakage current to ±10 μA when VCC = 0 V. This prevents back-driving of live backplanes or powered subsystems during card insertion/removal. The SN74LVC245APWG4 also includes robust ESD protection (2000-V HBM) and latch-up immunity (>250 mA), making it suitable for modular I/O systems requiring field-replaceable units.
What is the thermal resistance (RθJA) of the SN74LVC245APWG4 in its TSSOP-20 package?
The junction-to-ambient thermal resistance (RθJA) for the SN74LVC245APWG4 in the TSSOP-20 (PW) package is 83.6°C/W, measured under standard JEDEC JESD51-7 conditions. This value assumes a two-layer PCB with minimal copper area; actual thermal performance improves significantly with added copper pour or thermal vias. The SN74LVC245APWG4's RθJC(top) is 43.0°C/W, indicating efficient heat transfer to the PCB top surface - critical for compact industrial modules with limited airflow.
SN74LVC245APWG4 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
SN74LVC245APWG4 FAQ
1.How can I place an order for SN74LVC245APWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC245APWG4 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 SN74LVC245APWG4 reliable?
The price and inventory of SN74LVC245APWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC245APWG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC245APWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC245APWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC245APWG4?
SN74LVC245APWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC245APWG4 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 SN74LVC245APWG4?
For technical support, including SN74LVC245APWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC245APWG4 requirements.
6.How does Aetrix verify that SN74LVC245APWG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC245APWG4 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 SN74LVC245APWG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC245APWG4?
All SN74LVC245APWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC245APWG4, 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 SN74LVC245APWG4 part is unused and in its original packaging.
Return procedure for SN74LVC245APWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LVC245APWG4 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…
