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Texas Instruments SN74LVT245BDB
- Part No.:
- SN74LVT245BDB
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVT245BDB.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:16,520
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Product details
Overview
SN74LVT245B from Texas Instruments is a 3.3-V octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between 3.3-V and 5-V systems. It features direction control (DIR), output enable (OE), ±64 mA output drive at VCC = 3 V, 2.7–3.6 V operating range, and high-impedance state during power-up/down. Used in mixed-voltage backplane interfaces and legacy system upgrades.
For engineers reviewing the SN74LVT245B datasheet, SN74LVT245B pinout, SN74LVT245B application, or SN74LVT245B equivalent, key selection criteria include 3.3-V ABT logic compatibility, 5-V tolerant I/O, DIR/OE dual-control architecture, thermal performance in DB package (θJA = 115°C/W), and isolation behavior under low-VCC conditions.
Technical Context
This device implements an Advanced BiCMOS Technology (ABT) architecture optimized for low static power and TTL-level interoperability. It supports true bidirectional data flow via DIR-controlled signal path selection and full bus isolation via OE-driven 3-state outputs.
Its mixed-mode operation enables 5-V input/output voltage tolerance while powered from 3.3-V VCC, and its power-off output disable permits live insertion in hot-swap applications. The device enters high-impedance state when VCC drops below 1.5 V, ensuring safe power sequencing.
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 without functional loss |
| IOL / IOH | 64 mA / –32 mA at VCC = 3 V - drives standard TTL loads and sustains robust noise margins |
| tPLH / tPHL | 2.3 ns / 2.1 ns typical at VCC = 3.3 V - enables sub-5 ns propagation for high-speed bus bridging |
| VI (Input Voltage) | Up to 5.5 V - allows direct connection to 5-V logic without level-shifting circuitry |
| IOZL / IOZH | –5 µA / 5 µA - ensures minimal leakage in 3-state mode, critical for bus contention avoidance |
| θJA (DB Package) | 115°C/W - defines thermal derating limit for continuous operation in compact PCB layouts |
| VOL / VOH | 0.5 V / 2.0 V at IOL = 64 mA / IOH = –32 mA - meets TTL output swing requirements at full drive |
Pinout & Package
SN74LVT245B is packaged in a 20-pin Shrink Small-Outline (DB) package with 0.65 mm lead pitch and JEDEC MO-153 compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | DIR | Direction control input: L = B→A, H = A→B; determines real-time data path polarity |
| 2–9 | A1–A8 | Port A bidirectional data lines - connect to local 3.3-V bus; tolerate 5-V inputs |
| 11–18 | B1–B8 | Port B bidirectional data lines - interface to 5-V subsystems or legacy peripherals |
| 10 | GND | Ground reference - must be low-impedance return path for all I/O and supply currents |
| 20 | VCC | 3.3-V supply input - powers internal ABT circuitry; decoupling required within 10 mm |
| OE | Output Enable | Active-low control: L = transceiver enabled, H = all A/B ports in high-Z - isolates buses |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode I/O tolerance | 5-V input and output voltage capability with 3.3-V VCC - eliminates external level shifters in 3.3/5-V interconnects |
| Power-up/power-down high-Z | Automatic 3-state entry when VCC ∈ [0, 1.5 V] - prevents bus contention during supply ramping |
| Live insertion support | Outputs disabled when VCC = 0 - enables hot-plug capability in modular backplanes and docking stations |
| Low ground bounce (VOLP) | < 0.8 V at VCC = 3.3 V - reduces switching noise coupling into shared ground planes |
| Latch-up immunity | > 500 mA per JESD 17 - ensures robustness against transient overcurrent events in industrial environments |
Applications
| Industrial Backplane Interface | Legacy System Upgrade Bridge |
|---|---|
Use Scenario: Interfacing a modern 3.3-V FPGA-based controller to legacy 5-V ISA or VMEbus peripherals in factory automation equipment. IC Role / Device Role / Timing Role: Bidirectional voltage-translating bus transceiver managing data flow direction and isolation under microcontroller control. Use Value: Eliminates discrete level-shifter arrays and reduces board area by 40% while maintaining timing integrity up to 200 Mbps. | Use Scenario: Retrofitting aging test instrumentation with 3.3-V digital logic while retaining existing 5-V analog front-end modules and DACs. IC Role / Device Role / Timing Role: Asynchronous bus coupler synchronizing data transfers between mismatched voltage domains without clock domain crossing logic. Use Value: Enables drop-in replacement of obsolete 5-V transceivers with no firmware or layout changes beyond VCC routing. |
| Hot-Swappable Module Adapter | Embedded Communications Subsystem |
Use Scenario: Supporting field-replaceable compute modules in telecom line cards where modules may be inserted or removed while main chassis remains powered. IC Role / Device Role / Timing Role: Isolation gate that disables I/O paths during insertion/removal to prevent bus glitches and supply disturbances. Use Value: Meets Telcordia GR-1089-CORE surge and hot-swap compliance by guaranteeing high-Z state at VCC = 0. | Use Scenario: Connecting a 3.3-V ARM processor's GPIO expansion bus to 5-V RS-485 transceivers and CAN controllers in vehicle telematics units. IC Role / Device Role / Timing Role: Voltage-agile data conduit enabling protocol-agnostic peripheral attachment across mixed-supply subsystems. Use Value: Sustains 64 mA drive strength at 3.3-V VCC to meet RS-485 unit load requirements without external buffers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVTH245A | Lower drive (±32 mA), LVTH logic family, 2.7–3.6 V only, no 5-V I/O tolerance | Suitable only for pure 3.3-V systems; cannot replace SN74LVT245B in mixed-voltage designs | Select when cost and power are prioritized over 5-V interfacing capability |
| 74ALVC16245 | 16-bit, dual-octet, 1.65–3.6 V supply, 5-V tolerant inputs only (not outputs) | Requires external pull-ups for 5-V output drive; lacks native bidirectional 5-V output capability | Choose for higher channel count where 5-V output drive is not required on all pins |
Compared with SN74LVTH245A and 74ALVC16245, the SN74LVT245B uniquely delivers full 5-V input/output tolerance at 3.3-V VCC with ±64 mA drive, making it the only option among the three for robust 3.3/5-V bidirectional bus bridging without auxiliary components.
Availability
SN74LVT245B is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system upgrade bridges, hot-swappable module adapters, and embedded communications subsystems requiring stable component supply across extended temperature ranges (–40°C to 85°C).
Supply support for SN74LVT245B 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 company headquartered in Dallas, Texas, delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74LVT245B belongs to TI's ABT logic family, engineered for high-speed, low-power 3.3-V bus interfacing with backward compatibility to 5-V systems - targeting mixed-voltage infrastructure upgrades and modular system design.
FAQ
What is the maximum operating temperature range for the SN74LVT245B?
The SN74LVT245B is characterized for operation from –40°C to +85°C. This commercial temperature range is specified in the official Texas Instruments datasheet SCES004C and applies to all DB-package variants of the SN74LVT245B. Operation outside this range may result in parametric deviation or functional failure. Thermal derating must be applied if ambient exceeds 85°C, based on θJA = 115°C/W for the DB package.
Does the SN74LVT245B support 5-V outputs while powered from 3.3 V?
Yes, the SN74LVT245B supports 5-V output voltage levels while operating from a 3.3-V VCC supply. Its ABT output structure provides true 5-V tolerant outputs - verified by VI and VO absolute maximum ratings up to 7 V and recommended operating input voltage up to 5.5 V. This enables direct driving of 5-V TTL loads without external level-shifting circuitry, a key differentiator from standard LV or LVC devices.
How does the SN74LVT245B behave during power-up and power-down sequences?
The SN74LVT245B enters a high-impedance state automatically when VCC is between 0 V and 1.5 V, preventing bus contention during power ramping. For guaranteed high-Z above 1.5 V, OE must be tied to VCC via a pullup resistor. This behavior is intrinsic to the ABT process and is documented in the functional description and electrical characteristics tables of the SN74LVT245B datasheet SCES004C.
What is the output drive capability of the SN74LVT245B at 3.3-V VCC?
At VCC = 3.3 V, the SN74LVT245B delivers –32 mA high-level output current (IOH) and 64 mA low-level output current (IOL), per channel. These values are confirmed in the "Recommended Operating Conditions" and "Electrical Characteristics" sections of the SCES004C datasheet. Drive strength remains compliant across the full 2.7–3.6 V VCC range, supporting robust fanout to multiple TTL inputs.
Which package type is used for the SN74LVT245B part number listed in this product page?
The SN74LVT245B is supplied in the 20-pin Shrink Small-Outline (DB) package, as explicitly stated in the datasheet: "SN74LVT245B . . . DB, DW, OR PW PACKAGE". The DB package has a 0.65 mm lead pitch, JEDEC MO-153 outline, and thermal impedance θJA = 115°C/W - critical for thermal management in dense PCB layouts.
SN74LVT245BDB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVT
- Package/Case:
- 20-SSOP (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-SSOP
SN74LVT245BDB FAQ
1.How can I place an order for SN74LVT245BDB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVT245BDB 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 SN74LVT245BDB reliable?
The price and inventory of SN74LVT245BDB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVT245BDB is usually 5 days.
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SN74LVT245BDB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVT245BDB 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 SN74LVT245BDB?
For technical support, including SN74LVT245BDB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVT245BDB requirements.
6.How does Aetrix verify that SN74LVT245BDB is sourced from the original manufacturer or authorized distributors?
All SN74LVT245BDB 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 SN74LVT245BDB meets industry standards.
7.What is the process for return or replacement of SN74LVT245BDB?
All SN74LVT245BDB units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVT245BDB, 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 SN74LVT245BDB part is unused and in its original packaging.
Return procedure for SN74LVT245BDB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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