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Texas Instruments SN74LVTH245APWG4
- Part No.:
- SN74LVTH245APWG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVTH245APWG4.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,285
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Product details
Overview
SN74LVTH245APWG4 from Texas Instruments is a 3.3-V ABT octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between 3.3-V and 5-V buses. It features bus-hold circuitry on all A/B data inputs, Ioff support for hot insertion, and operates across −40°C to 85°C with VCC from 2.7 V to 3.6 V. Used in mixed-voltage system interconnects such as industrial backplanes and legacy interface bridges.
For engineers reviewing the SN74LVTH245APWG4 datasheet, SN74LVTH245APWG4 pinout, SN74LVTH245APWG4 application, or SN74LVTH245APWG4 equivalent, key selection criteria include its 3.3-V VCC compatibility with 5-V tolerant inputs/outputs, guaranteed 3-state isolation during power sequencing, bus-hold elimination of external pull resistors, and TSSOP-20 package thermal performance (θJA = 83°C/W).
Technical Context
This device implements an active-high direction control (DIR) and active-low output-enable (OE) to configure bidirectional data flow: when OE is low, data propagates either A→B (DIR = high) or B→A (DIR = low); when OE is high, both A and B ports enter high-impedance isolation. The ABT logic family ensures TTL-compatible thresholds while operating at 3.3-V supply.
Internal bus-hold circuitry maintains valid logic levels on unused A/B inputs without external components, and Ioff protection limits current backflow during partial power-down. Propagation delays are specified at 2.3 ns (tPHL), 2.1 ns (tPLH), and enable/disable times under 7.1 ns, supporting high-speed bus arbitration in real-time embedded systems.
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 with stable logic margins. |
| Input Voltage Tolerance | −0.5 V to 7 V - enables direct interfacing with 5-V TTL signals without level-shifting circuitry. |
| IOL / IOH | 64 mA / −32 mA - drives standard TTL loads with margin for fan-out and trace capacitance. |
| tPLH / tPHL | 2.1 ns / 2.3 ns at VCC = 3.3 V - ensures sub-3 ns propagation for high-throughput data transfers. |
| Bus-Hold Current | ±750 μA at VCC = 3.6 V - actively holds floating inputs at valid logic states, eliminating external pull-up/down resistors. |
| θJA (TSSOP) | 83°C/W - defines thermal resistance for PCB layout planning in compact industrial enclosures. |
| ESD Rating | 2000-V HBM, 200-V MM - meets JEDEC JESD22-A114/A115 for robust handling in manufacturing and field environments. |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height, exposed pad not present, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Data Inputs/Outputs | Bidirectional port A terminals; internally bus-held when floating; tolerate 5-V inputs at any VCC ≥ 2.7 V. |
| 9 | DIR | Direction control: high enables A→B transfer, low enables B→A transfer; TTL-compatible threshold (VIH = 2 V min). |
| 10 | GND | Ground reference for all logic and I/O; must be low-impedance connection to minimize ground bounce (VOLP < 0.8 V). |
| 11, 12, 13, 14, 15, 16, 17, 18 | B1–B8 Data Inputs/Outputs | Bidirectional port B terminals; identical electrical behavior to A-port; share same bus-hold and Ioff characteristics. |
| 19 | OE | Output-enable: active-low; forces both A and B ports into high-impedance state when high; requires pull-up to VCC for power-up safety. |
| 20 | VCC | 3.3-V supply input; decoupling capacitor (0.1 μF) required adjacent to pin for noise suppression and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 3.3-V VCC with 5-V tolerant I/O eliminates need for external level shifters in 3.3/5-V hybrid systems. |
| Hot-insertion support | Ioff and power-up 3-state prevent damaging current backflow and bus contention during live board insertion. |
| Integrated bus-hold | Active bus-hold on all 16 data lines removes requirement for 16 external pull-up/pull-down resistors, reducing BOM count and board area. |
| Low ground bounce | Typical VOLP < 0.8 V at VCC = 3.3 V ensures signal integrity in noise-sensitive applications like analog-digital co-location. |
| Latch-up immunity | Exceeds 500 mA per JESD17 - guarantees robustness against transient-induced latch-up in industrial power environments. |
Applications
| Industrial Backplane Interface | Legacy System Bridge |
|---|---|
Use Scenario: Connecting a modern 3.3-V FPGA-based controller to legacy 5-V peripheral modules on a shared backplane. IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant bus transceiver enabling synchronous data exchange between mismatched voltage domains. Use Value: Eliminates discrete level-shifters and reduces interconnect latency by 3.5 ns vs. passive resistor-capacitor solutions. | Use Scenario: Upgrading a 5-V microcontroller subsystem while retaining existing 5-V sensor and actuator interfaces. IC Role / Device Role / Timing Role: Isolates and translates control/data signals between new 3.3-V logic and legacy 5-V peripherals during phased migration. Use Value: Maintains full 5-V signal integrity while operating from 3.3-V rail, avoiding dual-supply complexity and cost. |
| Embedded Test Equipment | Programmable Logic Interconnect |
Use Scenario: Signal routing in automated test equipment where DUT interfaces vary between 3.3-V and 5-V logic families. IC Role / Device Role / Timing Role: Reconfigurable bus isolator/transceiver controlled via FPGA GPIO to adapt to multiple DUT voltage standards. Use Value: Single-component solution supports hot-swappable probe cards and reduces firmware overhead for voltage configuration. | Use Scenario: Data path management between CPLD and microprocessor in a compact edge-node controller. IC Role / Device Role / Timing Role: High-speed bidirectional data conduit with deterministic 2.3 ns propagation delay and sub-7 ns enable timing. Use Value: Enables tight timing closure in 50-MHz synchronous bus designs without added setup/hold margin penalties. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APW | Lower drive strength (24 mA IOL), no bus-hold, 1.65–3.6 V VCC range. | Suitable only for 3.3-V-only systems; lacks 5-V tolerance and hot-insertion support. | Select when cost sensitivity outweighs mixed-voltage capability and bus-hold convenience. |
| SN74AVC245PW | Higher speed (1.8 ns tPLH), 1.2–3.6 V VCC, no bus-hold, supports series-termination calibration. | Optimized for high-speed DDR memory interfaces; requires external termination and biasing. | Prefer for >100-MHz data rates where propagation delay dominates over voltage flexibility. |
Compared with SN74LVC245APW and SN74AVC245PW, the SN74LVTH245APWG4 uniquely combines 5-V input tolerance, integrated bus-hold, and Ioff-enabled hot insertion-making it the only choice for robust, low-BOM-count bridging in mixed-voltage industrial control systems.
Availability
SN74LVTH245APWG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bridges, and embedded test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVTH245APWG4 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 for industrial, automotive, and personal electronics markets.
The SN74LVTH245A product line delivers ABT-family octal transceivers optimized for mixed-voltage system interoperability, targeting industrial control, instrumentation, and legacy interface bridging where reliability and voltage flexibility are critical.
FAQ
What is the maximum operating temperature range for the SN74LVTH245APWG4?
The SN74LVTH245APWG4 is rated for operation from −40°C to +85°C ambient temperature. This industrial-grade range is validated per TI's recommended operating conditions and supported by thermal characterization (θJA = 83°C/W) in the TSSOP-20 package. Operation outside this range may result in parametric degradation or functional failure.
Does the SN74LVTH245APWG4 require external pull-up resistors on its data inputs?
No, the SN74LVTH245APWG4 does not require external pull-up or pull-down resistors on A or B data inputs due to integrated bus-hold circuitry. This feature actively maintains valid logic states on floating inputs, reducing BOM count and PCB space. Using external resistors with enabled bus-hold is explicitly discouraged in the datasheet.
Can the SN74LVTH245APWG4 safely interface with 5-V logic while powered from a 3.3-V supply?
Yes, the SN74LVTH245APWG4 supports mixed-mode operation: its inputs tolerate up to 7 V, and outputs drive 5-V TTL loads while powered from 2.7–3.6 V VCC. This allows direct connection to 5-V buses without level shifters, verified by VI = 5.5 V and VOH ≥ 2.0 V specifications under load.
How does the SN74LVTH245APWG4 support hot insertion in backplane applications?
The SN74LVTH245APWG4 supports hot insertion via two mechanisms: Ioff circuitry disables outputs during power-down to prevent backflow current, and power-up 3-state ensures outputs remain high-impedance until VCC stabilizes. Both features are production-tested and meet JEDEC JESD78 requirements for live-insertion reliability.
What is the recommended decoupling strategy for the SN74LVTH245APWG4?
A 0.1-μF ceramic capacitor placed as close as possible to the VCC pin (Pin 20) and GND pin (Pin 10) is mandatory for stable operation. Additional bulk capacitance (e.g., 4.7 μF tantalum) may be added near the power entry point. Layout must minimize loop inductance-trace lengths between capacitor pads and IC pins should be ≤ 2 mm.
SN74LVTH245APWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74LVTH245APWG4 FAQ
1.How can I place an order for SN74LVTH245APWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH245APWG4 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 SN74LVTH245APWG4 reliable?
The price and inventory of SN74LVTH245APWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH245APWG4 is usually 5 days.
3.What payment methods are accepted for SN74LVTH245APWG4?
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4.How is shipping managed for SN74LVTH245APWG4?
SN74LVTH245APWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH245APWG4 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 SN74LVTH245APWG4?
For technical support, including SN74LVTH245APWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH245APWG4 requirements.
6.How does Aetrix verify that SN74LVTH245APWG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVTH245APWG4 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 SN74LVTH245APWG4 meets industry standards.
7.What is the process for return or replacement of SN74LVTH245APWG4?
All SN74LVTH245APWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH245APWG4, 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 SN74LVTH245APWG4 part is unused and in its original packaging.
Return procedure for SN74LVTH245APWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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