My Inquiry
My Account
Texas Instruments SN74LVTH245ANSR
- Part No.:
- SN74LVTH245ANSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVTH245ANSR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,479
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LVTH245ANSR 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 systems. 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 down to 2.7 V. Used in mixed-voltage backplane interfaces and industrial control I/O expansion.
For engineers reviewing the SN74LVTH245ANSR datasheet, SN74LVTH245ANSR pinout, SN74LVTH245ANSR application, or SN74LVTH245ANSR equivalent, key selection criteria include its 20-pin SOP (NS) package, 3.3-V supply compatibility with 5-V tolerant inputs/outputs, bus-hold functionality eliminating external resistors, and guaranteed 3-state isolation during power-up/down.
Technical Context
This device implements an active-high direction-control (DIR) input and active-low output-enable (OE) input 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 delivers TTL-compatible output drive while operating at 3.3-V VCC.
It integrates Ioff protection to disable outputs and prevent current backflow during power-down, and power-up 3-state circuitry ensures outputs remain high-Z until VCC stabilizes. Bus-hold inputs maintain valid logic levels on unused or floating A/B pins without external pullup/pulldown resistors - a critical feature for robustness in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery operation and brownout resilience in portable or field-deployed equipment. |
| Input Voltage Tolerance | −0.5 V to 7 V - enables direct interfacing with 5-V logic without level shifters, simplifying mixed-mode signal design. |
| IOL / IOH | 64 mA / −32 mA at VCC = 3 V - drives standard TTL loads and sustains fanout of ≥10 in legacy backplane applications. |
| Propagation Delay | tPLH/tPHL ≤ 4 ns (VCC = 3.3 V, CL = 50 pF) - meets timing requirements for 100-MHz bus clock domains with margin. |
| Bus-Hold Current | ±750 μA (dynamic hold) - actively maintains stable logic states on unterminated data lines, reducing EMI susceptibility. |
| ESD Protection | 2000-V HBM, 200-V MM - exceeds JEDEC JESD22-A114/A115, supporting handling in non-EPA production environments. |
| Thermal Resistance θJA | 60°C/W (NS package) - enables reliable operation at full load in ambient temperatures up to 85°C without forced airflow. |
Pinout & Package
SOP (NS) package: 20-pin surface-mount, 0.635 mm pitch, 7.5 mm × 5.0 mm body, 2.0 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs/Outputs | Port A bidirectional data terminals; configured as inputs or outputs based on DIR and OE state. |
| 9 | DIR | Direction control: high = A→B, low = B→A; must be driven to valid logic level for proper operation. |
| 10 | GND | Ground reference for all internal circuitry and I/O buffers; requires low-inductance connection to system ground plane. |
| 11, 12, 13, 14, 15, 16, 17, 18 | B1–B8 Inputs/Outputs | Port B bidirectional data terminals; electrically identical to A-side with independent bus-hold per pin. |
| 19 | OE | Output enable: low = active transceiver mode, high = high-impedance isolation on both A and B ports. |
| 20 | VCC | 3.3-V supply input; requires local 0.1-μF ceramic decoupling capacitor placed within 3 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 3.3-V VCC with 5-V tolerant I/O eliminates need for external level translators in hybrid voltage systems. |
| Bus-hold on all data inputs | Eliminates external pullup/pulldown resistors, reducing BOM count and PCB area in space-constrained designs. |
| Ioff and power-up 3-state | Prevents damaging current backflow and driver conflicts during hot-plug events or power sequencing. |
| Low output ground bounce (VOLP) | <0.8 V at VCC = 3.3 V - minimizes noise coupling into adjacent analog or RF sections on shared PCBs. |
| Latch-up immunity | >500 mA per JESD17 - ensures robust operation under transient overvoltage or ESD stress conditions. |
Applications
| Industrial Backplane Interface | Legacy System Voltage Translation |
|---|---|
|
Use Scenario: Interfacing a 3.3-V FPGA-based controller to a 5-V PLC I/O module via parallel bus. IC Role / Device Role / Timing Role: Bidirectional bus transceiver enabling synchronous data exchange with direction control synchronized to address strobes. Use Value: Eliminates discrete level-shifter ICs and reduces interconnect latency by 2.3 ns vs. passive resistor-divider solutions. |
Use Scenario: Upgrading aging 5-V microcontroller peripherals (e.g., LCD drivers, keypad scanners) to 3.3-V MCU without redesigning PCB traces. IC Role / Device Role / Timing Role: Voltage-tolerant interface buffer preserving signal integrity across mixed-supply domains. Use Value: Maintains full 64-mA sink capability at 3.3-V VCC while accepting 5-V inputs - no timing penalty or logic-level ambiguity. |
| Hot-Swappable Module Communication | Embedded Test Equipment Data Capture |
|
Use Scenario: Isolating a field-replaceable sensor card from main controller during live insertion/removal in telecom chassis. IC Role / Device Role / Timing Role: Hot-insertion guard IC using Ioff and power-up 3-state to prevent bus contention during plug-in. Use Value: Enables zero-downtime maintenance by guaranteeing high-Z state before VCC reaches operational threshold. |
Use Scenario: Capturing parallel bus waveforms from DUT (device under test) running at 50 MHz in automated test fixtures. IC Role / Device Role / Timing Role: Signal conditioning buffer with sub-4-ns propagation delay and 9-pF Cio to minimize loading distortion. Use Value: Preserves edge fidelity and reduces setup/hold timing violations compared to direct probe connections. |
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 | Lower drive strength (24 mA sink), no bus-hold, 1.65–3.6 V VCC range. | Not suitable for floating-bus or 5-V-tolerant legacy interfaces; requires external pull resistors. | Select when cost sensitivity outweighs mixed-voltage robustness and board space allows external biasing. |
| SN74ALVC245PWR | Higher speed (tPD ≈ 2.8 ns), 1.65–3.6 V VCC, no 5-V tolerance, no bus-hold. | Requires level-shifting for 5-V systems; unsuitable for hot-swap due to lack of Ioff. | Choose only for new 3.3-V-only designs where maximum throughput and minimal propagation delay are critical. |
Compared with SN74LVC245APWR and SN74ALVC245PWR, the SN74LVTH245ANSR uniquely combines 5-V input tolerance, integrated bus-hold, and Ioff-enabled hot insertion - making it the sole option among these three for retrofitting legacy 5-V buses with modern 3.3-V controllers without layout changes.
Availability
SN74LVTH245ANSR is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and embedded test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74LVTH245ANSR 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 solutions.
The SN74LVTH245ANSR belongs to TI's ABT logic family, engineered specifically for robust mixed-voltage bus interfacing in industrial, communications, and computing systems demanding reliability across wide temperature ranges.
FAQ
What is the maximum operating temperature range for the SN74LVTH245ANSR?
The SN74LVTH245ANSR is rated for operation from −40°C to +85°C ambient temperature. This industrial-grade range ensures reliable performance in factory-floor controllers, outdoor telecom enclosures, and automotive under-hood modules where thermal cycling and extended temperature exposure occur. The NS package's 60°C/W θJA supports sustained operation at full drive current within this envelope.
Does the SN74LVTH245ANSR require external pullup resistors on its data inputs?
No, the SN74LVTH245ANSR does not require external pullup or pulldown resistors on A or B data inputs because it integrates active bus-hold circuitry on all 16 data terminals. This feature maintains valid logic states on floating or unterminated lines, reducing component count and improving noise immunity - a key advantage over LVC-family alternatives like SN74LVC245A.
Can the SN74LVTH245ANSR safely interface a 3.3-V microcontroller with a 5-V peripheral without level shifters?
Yes, the SN74LVTH245ANSR supports mixed-mode signal operation: its inputs tolerate up to 7 V, and outputs swing rail-to-rail within 3.3-V VCC while driving 5-V TTL loads. This allows direct connection between 3.3-V MCUs and legacy 5-V peripherals such as EPROMs, LCD controllers, or ISA-bus devices - confirmed by VI = 5.5 V and VOH ≥ 2.0 V specifications in the datasheet.
What is the purpose of the Ioff specification for the SN74LVTH245ANSR?
The Ioff specification (±100 μA max at VCC = 0) ensures that all outputs are disabled when the device is unpowered, preventing damaging current backflow from live buses into the inactive IC. This enables safe hot insertion into powered-backplane systems - a requirement verified in TI's application reports on hot-swap logic and confirmed by JESD78 testing.
Is the SN74LVTH245ANSR pin-compatible with other packages in the SN74LVTH245A family?
Yes, the SN74LVTH245ANSR shares identical pinout and function mapping with all 20-pin variants of the SN74LVTH245A family - including DW (SOIC), DB (SSOP), PW (TSSOP), and RGY (VQFN). Pin 1 (A1), pin 9 (DIR), pin 10 (GND), pin 19 (OE), and pin 20 (VCC) retain consistent roles across packages, enabling drop-in replacement when footprint and thermal constraints permit.
SN74LVTH245ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
SN74LVTH245ANSR FAQ
1.How can I place an order for SN74LVTH245ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH245ANSR 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 SN74LVTH245ANSR reliable?
The price and inventory of SN74LVTH245ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH245ANSR is usually 5 days.
3.What payment methods are accepted for SN74LVTH245ANSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH245ANSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVTH245ANSR?
SN74LVTH245ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH245ANSR 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 SN74LVTH245ANSR?
For technical support, including SN74LVTH245ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH245ANSR requirements.
6.How does Aetrix verify that SN74LVTH245ANSR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH245ANSR 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 SN74LVTH245ANSR meets industry standards.
7.What is the process for return or replacement of SN74LVTH245ANSR?
All SN74LVTH245ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH245ANSR, 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 SN74LVTH245ANSR part is unused and in its original packaging.
Return procedure for SN74LVTH245ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LVTH245ANSR 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…
