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Texas Instruments SN74LVTH245ADBR
- Part No.:
- SN74LVTH245ADBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVTH245ADBR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,356
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Product details
Overview
SN74LVTH245ADBR 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, features bus-hold on all data inputs, and delivers typical propagation delays of 2.3 ns (tPHL) and 2.1 ns (tPLH) at VCC = 3.3 V. Used in industrial backplane interfaces requiring hot-insertion support and level translation.
For engineers reviewing the SN74LVTH245ADBR datasheet, SN74LVTH245ADBR pinout, SN74LVTH245ADBR application, or SN74LVTH245ADBR equivalent, key selection criteria include its 20-pin SSOP (DB) package, Ioff-enabled hot-swap capability, ±100 µA off-state leakage, 3.3-V supply with 2.7–3.6-V operating range, and guaranteed 32-mA sink current per output.
Technical Context
This device implements an octal bidirectional bus transceiver with direction control (DIR) and output-enable (OE) logic. Data flows from A to B when DIR = HIGH and from B to A when DIR = LOW; OE = HIGH forces all outputs into high-impedance isolation. The ABT (Advanced BiCMOS Technology) architecture enables TTL-compatible input thresholds while operating from a 3.3-V supply.
It integrates active bus-hold circuitry on all A and B port inputs, eliminating external pullup/pulldown resistors. Ioff and power-up 3-state functionality ensure safe hot insertion by disabling outputs during power transitions and preventing backflow current when VCC = 0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 2.7 V to 3.6 V - supports unregulated battery operation down to 2.7 V without functional degradation. |
| IOH / IOL | −32 mA / +64 mA - drives standard TTL loads with margin; enables robust fanout in noisy industrial buses. |
| tPLH / tPHL | 2.1 ns / 2.3 ns @ VCC = 3.3 V - ensures sub-3 ns propagation for high-speed 32-bit or 64-bit parallel bus timing budgets. |
| VIH / VIL | 2.0 V / 0.8 V - compatible with 5-V TTL logic inputs while powered from 3.3 V, enabling seamless level translation. |
| Ioff | ±100 µA @ VCC = 0 V - prevents damaging current flow during hot-plug events, critical for modular backplane systems. |
| Bus-Hold Current | ±750 µA dynamic hold - maintains valid logic state on floating data lines without external biasing components. |
| ESD Protection | 2000-V HBM, 200-V MM - exceeds JEDEC JESD22-A114/A115, supporting handling in non-ESD-controlled environments. |
Pinout & Package
SN74LVTH245ADBR is housed in a 20-pin SSOP (Shrink Small Outline Package), designated DB package, with 0.65-mm lead pitch, 7.4-mm body width, and 2-mm max height. Pin 1 is marked by a notch or index area at the top-left corner of the package.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs/Outputs | Port A bidirectional data terminals; connected to local 3.3-V bus side. |
| 11, 12, 13, 14, 15, 16, 17, 18 | B1–B8 Inputs/Outputs | Port B bidirectional data terminals; interfaced to 5-V legacy subsystems. |
| 9 | DIR | Direction control: HIGH routes A→B, LOW routes B→A; TTL-compatible threshold. |
| 10 | OE | Output enable: LOW enables transceiver, HIGH places all A/B outputs in high-Z state. |
| 20 | VCC | 3.3-V supply input; decoupling capacitor required within 1 cm for noise suppression. |
| 19 | GND | Ground reference; must be low-inductance connection shared with VCC decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | Accepts 5-V inputs and drives 5-V loads while powered from 3.3-V VCC - eliminates external level shifters in hybrid voltage systems. |
| Bus-hold on all data inputs | Active internal circuitry holds unused A/B pins at valid logic levels - removes need for 10-kΩ external pull resistors and saves PCB space. |
| Ioff and power-up 3-state | Outputs disable automatically during power-down or power-up sequences - prevents bus contention and enables true hot-swap capability. |
| Low ground bounce (VOLP) | <0.8 V typical at VCC = 3.3 V, TA = 25°C - reduces switching noise coupling into analog sections or adjacent digital signals. |
| Latch-up immunity | Exceeds 500 mA per JESD17 - ensures robustness against transient overcurrent events in industrial power rail environments. |
Applications
| Industrial Backplane Interface | Legacy System Upgrades |
|---|---|
|
Use Scenario: Interfacing a modern 3.3-V FPGA-based controller to a legacy 5-V VMEbus or ISA-compatible peripheral card cage. IC Role / Device Role / Timing Role: Bidirectional level-translating bus transceiver managing data flow under DIR/OE control with sub-3 ns timing. Use Value: Enables drop-in replacement of obsolete 5-V transceivers without redesigning power delivery or adding discrete level shifters. |
Use Scenario: Retrofitting a 5-V microcontroller-based test fixture with a 3.3-V logic analyzer module requiring clean bidirectional data capture. IC Role / Device Role / Timing Role: Isolates and translates signals between mismatched voltage domains while maintaining signal integrity during hot probe attachment. Use Value: Bus-hold prevents floating inputs during probe disconnect; Ioff protects both devices during live connection/disconnection. |
| Hot-Swappable Module Carrier | Embedded Control Bus Buffering |
|
Use Scenario: Carrier board in modular PLC I/O system where field modules are inserted/removed while main controller remains powered. IC Role / Device Role / Timing Role: Provides galvanically isolated data path with controlled enable/disable sequencing via OE and DIR. Use Value: Power-up 3-state prevents glitching on shared backplane during module insertion; latch-up immunity withstands ESD events in factory floors. |
Use Scenario: Buffering address/data lines between a 3.3-V ARM Cortex-M7 MCU and multiple 5-V peripheral ICs (ADCs, DACs, display drivers). IC Role / Device Role / Timing Role: Octal transceiver serving as voltage-domain bridge with configurable directionality per transaction cycle. Use Value: Sub-3 ns propagation delay preserves setup/hold margins across 25-MHz parallel bus; ±64 mA drive strength ensures full TTL fanout. |
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, LVC family (not ABT); lacks Ioff and hot-swap support. | Suitable only for static 3.3-V-to-3.3-V buffering; not rated for 5-V-tolerant operation or hot insertion. | Select when cost sensitivity outweighs mixed-voltage or hot-swap requirements; verify external pull resistors are added. |
| SN74AVC245RHLR | AVC series with higher speed (1.8 ns typ), 1.65–3.6-V VCC range, but no 5-V input tolerance; requires external level shifting for 5-V interface. | Optimized for ultra-low-voltage mobile SoC interconnects, not industrial 5-V legacy integration. | Choose only if entire system operates ≤3.3 V and maximum timing margin is critical; avoid for 5-V signal domains. |
Compared with SN74LVC245APWR and SN74AVC245RHLR, the SN74LVTH245ADBR uniquely combines 5-V input tolerance, bus-hold, Ioff, and ABT drive strength - making it the sole option among the three qualified for mixed-voltage hot-swap backplane designs.
Availability
SN74LVTH245ADBR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system upgrades, hot-swappable module carriers, and embedded control bus buffering requiring stable component supply across extended product lifecycles.
Supply support for SN74LVTH245ADBR 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 90 years of innovation in industrial, automotive, and communications markets.
The SN74LVTH245ADBR belongs to TI's LVTH (Low-Voltage TTL) ABT logic family, engineered specifically for robust 3.3-V operation with backward compatibility to 5-V TTL systems in demanding industrial and infrastructure applications.
FAQ
What is the maximum recommended operating temperature for the SN74LVTH245ADBR?
The SN74LVTH245ADBR is specified for continuous operation from −40°C to +85°C ambient temperature. This industrial-grade rating ensures reliable performance in factory automation controllers, outdoor telecom equipment, and motor drive enclosures where thermal management is constrained. Derating is not required within this range per TI's SCBS130T datasheet.
Does the SN74LVTH245ADBR require external pullup resistors on its data inputs?
No. The SN74LVTH245ADBR includes integrated bus-hold circuitry on all A and B port inputs, actively maintaining valid logic states on floating or unused lines. Adding external pullup/pulldown resistors is explicitly discouraged in the datasheet, as it may interfere with bus-hold current and cause unpredictable behavior or increased power consumption.
Can the SN74LVTH245ADBR safely interface a 3.3-V microcontroller with a 5-V EEPROM?
Yes. The SN74LVTH245ADBR accepts 5-V inputs while powered from 3.3 V and can drive 5-V loads with sufficient current (64 mA sink). Its VIH = 2.0 V and VIL = 0.8 V thresholds ensure reliable recognition of 5-V logic levels, and its 5.5-V absolute max input rating provides margin against overshoot - making it suitable for I²C/SPI bus extension to 5-V EEPROMs.
What is the purpose of the OE pin on the SN74LVTH245ADBR, and how should it be connected?
The OE (Output Enable) pin controls bidirectional output isolation: when OE = HIGH, all A and B port outputs enter high-impedance state, electrically disconnecting both buses. To guarantee high-Z during power-up, TI recommends tying OE to VCC through a pullup resistor (value determined by driver sink capability); direct connection to VCC is acceptable if the driving source can sink ≥100 µA.
Is the SN74LVTH245ADBR pin-compatible with other packages in the SN74LVTH245A family?
Yes - all SN74LVTH245A variants (including DW, PW, NS, RGY, and DB packages) share identical 20-pin functional pinouts per TI's SCBS130T datasheet. The SN74LVTH245ADBR (DB package) uses the same pin mapping as SN74LVTH245ADW (DW) and SN74LVTH245APWR (PW), enabling layout reuse across package options for prototyping and volume production flexibility.
SN74LVTH245ADBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 20-SSOP (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-SSOP
SN74LVTH245ADBR FAQ
1.How can I place an order for SN74LVTH245ADBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH245ADBR 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 SN74LVTH245ADBR reliable?
The price and inventory of SN74LVTH245ADBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH245ADBR is usually 5 days.
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Once your SN74LVTH245ADBR 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 SN74LVTH245ADBR?
For technical support, including SN74LVTH245ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH245ADBR requirements.
6.How does Aetrix verify that SN74LVTH245ADBR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH245ADBR 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 SN74LVTH245ADBR meets industry standards.
7.What is the process for return or replacement of SN74LVTH245ADBR?
All SN74LVTH245ADBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH245ADBR, 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 SN74LVTH245ADBR part is unused and in its original packaging.
Return procedure for SN74LVTH245ADBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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