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Texas Instruments SN74LVTH245APWRE4
- Part No.:
- SN74LVTH245APWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVTH245APWRE4.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,871
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Product details
Overview
SN74LVTH245APWRE4 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-to-modern interface bridges.
For engineers reviewing the SN74LVTH245APWRE4 datasheet, SN74LVTH245APWRE4 pinout, SN74LVTH245APWRE4 application, or SN74LVTH245APWRE4 equivalent, key selection criteria include its 3.3-V supply compatibility with 5-V tolerant I/O, 3-state control via DIR/OE, bus-hold elimination of external resistors, and TSSOP-20 packaging for space-constrained PCB layouts.
Technical Context
This device implements an ABT (Advanced BiCMOS Technology) architecture enabling TTL-level signal translation while operating from a 3.3-V supply. Its dual-directional data path is controlled by the DIR input, and output isolation is managed by the active-low OE signal - both supporting hot-swap sequencing via power-up 3-state and Ioff protection.
The integrated bus-hold circuitry maintains valid logic states on floating A/B inputs without external pullups, and the device meets JESD 17 latch-up immunity (>500 mA) and JESD 22 ESD ratings (2000-V HBM, 200-V MM), making it suitable for rugged industrial environments with transient-prone signal lines.
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 thresholds. |
| I/O Voltage Tolerance | 5.5 V max on inputs/outputs - enables direct interfacing with 5-V systems without level-shifting components. |
| Bus-Hold Current | ±750 μA at VCC = 3.6 V - actively holds unused data lines at valid logic levels, eliminating need for external biasing. |
| Output Drive | 64 mA sink / 32 mA source at VCC = 3 V - sufficient for driving multiple TTL loads or moderate-capacitance traces. |
| Propagation Delay | 2.1–4.0 ns (tPLH/tPHL) at VCC = 3.3 V, CL = 50 pF - ensures high-speed bus synchronization in real-time control applications. |
| Hot-Insertion Support | Ioff and power-up 3-state - prevents backfeed current and output contention during live board insertion. |
| ESD Protection | 2000-V HBM, 200-V MM - exceeds standard industrial immunity requirements for handling and assembly. |
Pinout & Package
TSSOP-20 package (PW), 6.95 mm × 4.4 mm × 1.2 mm body, 0.65 mm pitch, exposed thermal pad optional per design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Data Inputs/Outputs | Bidirectional A-side bus terminals; internally bus-held when floating. |
| 11, 12, 13, 14, 15, 16, 17, 18 | B1–B8 Data Inputs/Outputs | Bidirectional B-side bus terminals; compatible with 5-V signaling at 3.3-V VCC. |
| 9 | DIR (Direction Control) | High = A→B transfer; Low = B→A transfer; controls internal transceiver path polarity. |
| 10 | OE (Output Enable) | Active-low; places all A/B outputs in high-impedance state when high, isolating buses. |
| 20 | VCC | 3.3-V supply input; must be decoupled locally to suppress switching noise. |
| 19 | GND | Ground reference for all I/O and internal logic; requires low-inductance connection to plane. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5-V-tolerant I/O with 3.3-V VCC enables seamless bridging between legacy 5-V logic and modern low-voltage subsystems. |
| Integrated bus-hold circuitry | Eliminates external pullup/pulldown resistors on all 16 data lines, reducing BOM count and PCB area. |
| Hot-insertion support | Ioff and power-up 3-state prevent damaging current flow and bus contention during live module replacement. |
| Low ground bounce | VOLP < 0.8 V at VCC = 3.3 V ensures signal integrity in high-speed parallel bus environments. |
| Latch-up immunity | Exceeds 500 mA per JESD 17 - robust against transient-induced latch-up in noisy industrial settings. |
Applications
| Industrial Backplane Interconnect | Legacy System Interface Adapter |
|---|---|
Use Scenario: Connecting a 3.3-V FPGA-based controller to a 5-V PLC I/O module over a shared parallel bus. IC Role / Device Role / Timing Role: Bidirectional voltage-translating transceiver managing data flow direction and bus isolation under microcontroller control. Use Value: Enables direct interoperability without discrete level shifters, reducing latency and component count in deterministic control loops. | Use Scenario: Upgrading a 5-V microcontroller-based test fixture to integrate a 3.3-V ADC while retaining existing bus wiring. IC Role / Device Role / Timing Role: Isolates and translates signals between mismatched voltage domains during read/write cycles. Use Value: Preserves investment in legacy cabling and connectors while supporting higher-resolution sensor data acquisition. |
| Hot-Swappable Module Interface | Embedded Communication Bridge |
Use Scenario: Supporting field-replaceable compute modules in telecom line cards where modules may be inserted while powered. IC Role / Device Role / Timing Role: Provides Ioff-enabled isolation and power-up 3-state to prevent bus conflicts during insertion/removal. Use Value: Eliminates need for complex sequencing circuitry and guarantees safe hot-swap compliance per IEC 61000-4-2. | Use Scenario: Linking a 3.3-V ARM processor's GPIO expansion bus to a 5-V CAN transceiver cluster in automotive body electronics. IC Role / Device Role / Timing Role: Synchronizes data handshaking between domains using DIR/OE-controlled timing windows. Use Value: Maintains signal integrity across voltage boundaries while meeting automotive EMC requirements via low ground bounce. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245A | Lower drive strength (24 mA sink), no bus-hold, 1.65–3.6 V VCC range. | Suitable only for fully 3.3-V systems; lacks 5-V tolerance and hot-swap support. | Select when cost and power are prioritized over mixed-voltage robustness. |
| SN74ALVC245 | Higher speed (tPD ≈ 2.3 ns), same VCC range, no bus-hold, lower ICC. | Requires external pullups; not rated for hot insertion or 5-V I/O stress. | Prefer for high-frequency, low-power 3.3-V-only designs with controlled termination. |
Compared with SN74LVC245A and SN74ALVC245, the SN74LVTH245APWRE4 uniquely delivers 5-V-tolerant I/O, integrated bus-hold, and Ioff-enabled hot-swap capability - making it the only option among the three qualified for mixed-voltage industrial backplane and legacy interface applications.
Availability
SN74LVTH245APWRE4 is available at Aetrix Electronics and suitable for industrial backplane interconnect, legacy system interface adapters, hot-swappable module interfaces, and embedded communication bridges requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVTH245APWRE4 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, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The SN74LVTH245A product line was engineered to solve mixed-voltage system integration challenges in industrial control, telecom infrastructure, and instrumentation - specifically addressing 3.3-V core logic interfacing with legacy 5-V peripherals.
FAQ
What is the maximum input voltage rating for SN74LVTH245APWRE4?
The SN74LVTH245APWRE4 supports input voltages up to 5.5 V on all A/B data pins and control inputs, independent of VCC. This 5-V tolerance allows direct connection to legacy 5-V logic families without external level-shifting circuitry, while maintaining full functionality at its 3.3-V supply rail.
Does SN74LVTH245APWRE4 require external pullup resistors on its data lines?
No - the SN74LVTH245APWRE4 integrates active bus-hold circuitry on all 16 A/B data inputs, which maintains valid logic states on floating lines. Using external pullups with this feature is explicitly discouraged in the datasheet, as it may cause contention and increased power consumption.
Can SN74LVTH245APWRE4 be used in hot-swap applications?
Yes - the SN74LVTH245APWRE4 includes Ioff circuitry and power-up 3-state functionality, both certified for hot-insertion use cases. When VCC = 0 V, Ioff disables outputs to prevent backflow current; during power ramp-up, outputs remain in high-impedance until VCC stabilizes, avoiding bus conflicts.
What is the operating temperature range for SN74LVTH245APWRE4?
The SN74LVTH245APWRE4 is specified for industrial operation from −40°C to +85°C ambient temperature. This range is validated across all electrical parameters including propagation delay, drive strength, and bus-hold performance, ensuring reliability in factory automation and outdoor equipment deployments.
How does the DIR pin control data flow direction in SN74LVTH245APWRE4?
The DIR pin on SN74LVTH245APWRE4 determines bidirectional data path orientation: when DIR = Low, data flows from B-bus to A-bus; when DIR = High, data flows from A-bus to B-bus. This control is synchronous with OE - both signals must be stable before valid data transfer occurs.
SN74LVTH245APWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
SN74LVTH245APWRE4 FAQ
1.How can I place an order for SN74LVTH245APWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH245APWRE4 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 SN74LVTH245APWRE4 reliable?
The price and inventory of SN74LVTH245APWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH245APWRE4 is usually 5 days.
3.What payment methods are accepted for SN74LVTH245APWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH245APWRE4 transactions.
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4.How is shipping managed for SN74LVTH245APWRE4?
SN74LVTH245APWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH245APWRE4 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 SN74LVTH245APWRE4?
For technical support, including SN74LVTH245APWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH245APWRE4 requirements.
6.How does Aetrix verify that SN74LVTH245APWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVTH245APWRE4 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 SN74LVTH245APWRE4 meets industry standards.
7.What is the process for return or replacement of SN74LVTH245APWRE4?
All SN74LVTH245APWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH245APWRE4, 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 SN74LVTH245APWRE4 part is unused and in its original packaging.
Return procedure for SN74LVTH245APWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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