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Texas Instruments SN74LVTH245ANS
- Part No.:
- SN74LVTH245ANS
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVTH245ANS.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:932
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Product details
Overview
SN74LVTH245ANS 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 supports mixed-mode signal operation, provides bus-hold on all data inputs, and features Ioff and power-up 3-state for hot insertion in industrial backplanes and embedded controllers.
For engineers reviewing the SN74LVTH245ANS datasheet, SN74LVTH245ANS pinout, SN74LVTH245ANS application, or SN74LVTH245ANS equivalent, key selection criteria include its 20-pin SOP-NS package, 2.7–3.6-V supply range, ±100 µA Ioff, 3.5 ns typical propagation delay, and support for TTL-level interfacing without external pull resistors.
Technical Context
This device implements an active-high direction-control (DIR) and active-low output-enable (OE) logic architecture to route data bidirectionally between two 8-bit buses (A↔B). Its ABT (Advanced BiCMOS Technology) core delivers low ground bounce (VOLP < 0.8 V at VCC = 3.3 V) and robust noise immunity across temperature.
The integrated bus-hold circuitry maintains valid logic states on floating A/B inputs without external components, while Ioff protection limits current flow during power-down. The design meets JESD 17 latch-up >500 mA and exceeds JESD 22 ESD ratings (2000-V HBM, 200-V MM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - enables stable operation under unregulated battery supply down to 2.7 V |
| Propagation Delay (tPLH/tPHL) | 2.3 ns (typ) at VCC = 3.3 V - ensures sub-5 ns timing for high-speed bus arbitration |
| Ioff Current | ±100 µA max at VCC = 0 - prevents damaging backflow during hot-swap or partial power-down |
| Bus-Hold Current (II(hold)) | ±750 µA max - actively sustains input logic state without external pull resistors |
| Output Drive (IOL/IOH) | 64 mA / −32 mA - drives standard TTL loads directly with no buffer stage |
| Input Voltage Tolerance | VI up to 5.5 V - allows direct connection to 5-V logic without level-shifting circuitry |
| Thermal Resistance (θJA) | 60°C/W (NS package) - supports continuous operation at 85°C ambient with minimal heatsinking |
Pinout & Package
SOP-NS package: 20-pin surface-mount small-outline plastic package, 7.5 mm × 5.0 mm body, 0.65 mm pitch, 2.0 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low control: disables all A/B outputs into high-impedance state for bus isolation |
| 2–9 | A1–A8 | Data inputs/outputs for A-side bus; feature bus-hold circuitry |
| 10 | GND | Power ground reference for all internal logic and I/O stages |
| 11–18 | B1–B8 | Data inputs/outputs for B-side bus; feature bus-hold circuitry |
| 19 | DIR | Direction control: low = B→A, high = A→B; determines data flow path |
| 20 | VCC | 3.3-V supply input; powers ABT core and I/O buffers |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage interface | 5-V tolerant inputs/outputs with 3.3-V VCC - eliminates external level shifters in 3.3/5-V hybrid systems |
| Hot-insertion support | Ioff + power-up 3-state - prevents bus contention and backdrive damage during live board replacement |
| Integrated bus-hold | Self-biasing on all 16 data pins - removes need for 16 external pullup/pulldown resistors |
| Low ground bounce | VOLP < 0.8 V at TA = 25°C - reduces switching noise coupling into analog sections or adjacent signals |
| Robust reliability | Latch-up >500 mA (JESD 17), 2000-V HBM ESD - suitable for industrial environments with transient exposure |
Applications
| Industrial Backplane Interface | Embedded Controller Data Bridge |
|---|---|
Use Scenario: Interfacing a 3.3-V microcontroller unit to legacy 5-V peripheral cards in modular PLC racks. IC Role / Device Role / Timing Role: Bidirectional bus transceiver enabling synchronous data exchange between mismatched voltage domains. Use Value: Eliminates discrete level-shifters and pull resistors, reducing BOM count by ≥18 components per interface channel. | Use Scenario: Isolating and routing memory-mapped I/O between dual-core ARM processors sharing a common peripheral bus. IC Role / Device Role / Timing Role: Direction-controlled octal data conduit with sub-5 ns propagation for deterministic inter-core communication. Use Value: Enables real-time coherency without software overhead; OE pin allows dynamic bus arbitration via GPIO. |
| Hot-Swappable Module Interface | Test Equipment Signal Conditioning |
Use Scenario: Supporting field-replaceable compute modules in telecom line cards where power sequencing must avoid bus conflicts. IC Role / Device Role / Timing Role: Ioff-enabled transceiver maintaining high-Z state during module insertion/removal under live backplane power. Use Value: Prevents destructive current backflow and system reset events during maintenance operations. | Use Scenario: Buffering and translating digital stimulus signals from FPGA-based pattern generators to DUTs with mixed 3.3-V/5-V logic families. IC Role / Device Role / Timing Role: Low-jitter, low-ground-bounce driver ensuring clean edge integrity for high-fidelity test vector delivery. Use Value: VOLP < 0.8 V minimizes timing uncertainty in critical setup/hold windows of high-speed DUTs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245A | Lower drive strength (24 mA IOL), no bus-hold, no Ioff, 1.65–3.6 V VCC | Not suitable for hot-swap or floating-bus scenarios; requires external pull resistors | Select when cost sensitivity outweighs robustness requirements and system guarantees controlled bus states |
| SN74ALVC245 | Higher speed (2.1 ns tPLH), 1.65–3.6 V VCC, no bus-hold, no Ioff | Lacks bus-hold and Ioff - unsuitable for unpowered insertion or undefined input conditions | Prefer only in fully powered, tightly controlled environments where maximum speed justifies added design constraints |
Compared with SN74LVC245A and SN74ALVC245, the SN74LVTH245ANS uniquely combines 5-V tolerance, bus-hold, and Ioff in a single SOP-NS package - making it the only option among the three qualified for hot-swap-capable industrial backplanes.
Availability
SN74LVTH245ANS is available at Aetrix Electronics and suitable for industrial backplane interfaces, embedded controller data bridges, and hot-swappable module interfaces requiring stable component supply across extended temperature ranges (−40°C to 85°C).
Supply support for SN74LVTH245ANS 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 SN74LVTH245ANS belongs to TI's ABT logic family, engineered specifically for robust 3.3-V bus interfacing in mixed-voltage systems with demanding reliability and hot-swap requirements.
FAQ
What is the maximum operating temperature range for the SN74LVTH245ANS?
The SN74LVTH245ANS 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 resistance (θJA = 60°C/W) and electrical characterization across the full span. The SN74LVTH245ANS maintains specified VOH/VOL, propagation delay, and Ioff performance within this range.
Does the SN74LVTH245ANS require external pull-up or pull-down resistors on its data lines?
No, the SN74LVTH245ANS does not require external pull-up or pull-down resistors on its A1–A8 or B1–B8 data lines. It integrates active bus-hold circuitry that maintains valid logic states on unused or floating inputs. Using external resistors with the SN74LVTH245ANS is explicitly discouraged in the datasheet, as it may interfere with bus-hold functionality and increase power consumption.
Can the SN74LVTH245ANS be used in hot-swap applications?
Yes, the SN74LVTH245ANS is explicitly designed for hot-insertion applications. Its Ioff circuitry disables outputs when VCC = 0, preventing damaging current backflow, and its power-up 3-state feature ensures outputs remain in high-impedance during power ramp-up/down. These capabilities are verified per JESD 78 and documented in TI's SCBS130T datasheet for the SN74LVTH245ANS.
What is the pin 1 marking and orientation for the SN74LVTH245ANS SOP-NS package?
The SN74LVTH245ANS uses a standard SOP-NS package with pin 1 located at the top-left corner when the part marking "LVTH245A" is read left-to-right with the notch or index mark facing upward. The package outline confirms a 20-pin configuration with 0.65 mm pitch, and the TI DB0020A drawing specifies pin 1 indexing in quadrant Q1 of the tape reel.
How does the SN74LVTH245ANS handle 5-V input signals while operating at 3.3-V VCC?
The SN74LVTH245ANS supports mixed-mode signal operation: its inputs tolerate up to 5.5 V regardless of VCC, allowing direct connection to 5-V TTL outputs while powered from 3.3 V. This capability is enabled by ABT input structure and is guaranteed across the full operating temperature range. Outputs swing rail-to-rail (0 V to VCC) but maintain 5-V compatibility through input-only tolerance - the SN74LVTH245ANS does not generate 5-V outputs.
SN74LVTH245ANS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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-SO
SN74LVTH245ANS FAQ
1.How can I place an order for SN74LVTH245ANS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH245ANS 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 SN74LVTH245ANS reliable?
The price and inventory of SN74LVTH245ANS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH245ANS is usually 5 days.
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SN74LVTH245ANS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH245ANS 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 SN74LVTH245ANS?
For technical support, including SN74LVTH245ANS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH245ANS requirements.
6.How does Aetrix verify that SN74LVTH245ANS is sourced from the original manufacturer or authorized distributors?
All SN74LVTH245ANS 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 SN74LVTH245ANS meets industry standards.
7.What is the process for return or replacement of SN74LVTH245ANS?
All SN74LVTH245ANS units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH245ANS, 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 SN74LVTH245ANS part is unused and in its original packaging.
Return procedure for SN74LVTH245ANS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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