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Texas Instruments SN74LVC8T245DBRG4
- Part No.:
- SN74LVC8T245DBRG4
- Manufacturer:
- Texas Instruments
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVC8T245DBRG4.pdf
- Description:
- IC TRANSLATION TXRX 5.5V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,343
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Product details
Overview
SN74LVC8T245 from Texas Instruments is an 8-bit dual-supply non-inverting bus transceiver enabling bidirectional voltage-level translation between 1.65V and 5.5V domains. It features independent VCCA and VCCB rails, 3-state outputs controlled by DIR/OE pins referenced to VCCA, and Ioff support for partial-power-down operation. It is used in mixed-voltage system interconnects such as 1.8V microcontrollers interfacing with 3.3V or 5V peripherals.
For engineers reviewing the SN74LVC8T245 datasheet, SN74LVC8T245 pinout, SN74LVC8T245 application, or SN74LVC8T245 equivalent, key selection criteria include configurable dual-rail operation (1.65–5.5V per rail), glitch-free power sequencing, VCC isolation behavior, ±32mA output drive at 5V, and compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The SN74LVC8T245 implements asynchronous bidirectional data flow via direction-controlled push-pull outputs, where DIR selects A→B (high) or B→A (low) transmission while OE enables/disables both ports. Control inputs (DIR, OE) are referenced solely to VCCA, decoupling logic control from B-side supply conditions.
Its dual-rail architecture supports universal translation among 1.8V, 2.5V, 3.3V, and 5V nodes without external components. The VCC isolation feature forces all I/Os into high-impedance when either VCCA or VCCB falls below 100mV or floats, preventing backdrive and ensuring safe power-up/down sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Range (VCCA/VCCB) | 1.65V to 5.5V - Enables direct level translation between common logic families without external biasing. |
| Output Drive (IOL/IOH) | ±32mA at 5V - Sufficient to drive standard CMOS loads and parallel multiple outputs for higher current. |
| Propagation Delay (tPLH/tPHL) | 0.3ns to 23.8ns - Varies with supply voltages; sub-5ns typical at 5V→5V, enabling >100MHz data rates in short traces. |
| Ioff Leakage | ±2μA max - Prevents damaging back-current during partial power-down, critical for hot-swap and low-power standby modes. |
| ESD Rating (HBM) | ±4000V - Meets industrial robustness requirements for handling and board assembly without special ESD controls. |
| Operating Temperature | –40°C to +85°C - Qualified for extended industrial environments including PLCs and CNC controllers. |
| Input Capacitance (Ci) | 5pF - Low capacitive loading preserves signal integrity on high-speed buses and reduces timing skew. |
Pinout & Package
SN74LVC8T245DBRG4 uses a 24-pin SSOP (DB) package measuring 8.2mm × 7.8mm with gull-wing leads and three ground pins (11, 12, 13) for noise suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port supply reference | Powers A-side I/Os and references DIR/OE logic thresholds; must be stable before enabling control signals. |
| DIR (Pin 2) | Direction control input | High = A→B data flow; low = B→A; referenced to VCCA, not VCCB. |
| A1–A8 (Pins 3–10) | A-port bidirectional I/Os | Track VCCA voltage; accept 1.65–5.5V logic levels regardless of VCCB value. |
| GND (Pins 11,12,13) | Ground return | Three dedicated GND pins reduce ground bounce and improve noise immunity in high-speed switching. |
| B8–B1 (Pins 14–21) | B-port bidirectional I/Os | Track VCCB voltage; electrically isolated from A-side except through transceiver core. |
| OE (Pin 22) | Output enable input | Active-low; pull high to 3-state all outputs; referenced to VCCA, enabling control even if VCCB is unpowered. |
| VCCB (Pins 23,24) | B-port supply reference | Dual VCCB pins lower impedance and improve decoupling for B-side I/Os under heavy load. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable dual-rail operation | Independent VCCA and VCCB supplies (1.65–5.5V each) enable translation between any two standard logic voltages without external circuitry. |
| VCC isolation & disconnect | Automatic high-impedance output state when either VCCA or VCCB <100mV or floating - eliminates need for external power-good monitoring. |
| Glitch-free power sequencing | No defined ramp order required for VCCA/VCCB - prevents false logic transitions during power-up/down in mixed-rail systems. |
| Ioff partial-power-down support | Sub-μA leakage during power-off prevents back-current into powered subsystems - essential for hot-plug and battery-backed modules. |
| Robust ESD protection | 4kV HBM and 1kV CDM ratings meet industrial handling requirements without additional protection components. |
Applications
| Industrial PLC Backplane Interface | Embedded Computing Memory Expansion |
|---|---|
Use Scenario: Interfacing a 3.3V ARM-based controller with legacy 5V I/O modules in a programmable logic controller rack. IC Role / Device Role / Timing Role: Bidirectional voltage translator managing data/address lines between mismatched voltage domains while maintaining timing integrity across 24-bit parallel bus. Use Value: Eliminates discrete level-shifter arrays, reduces PCB area by 40%, and guarantees glitch-free operation during module hot-swap due to VCC isolation. | Use Scenario: Adding external SRAM or Flash memory to a 1.8V SoC in network-attached storage hardware. IC Role / Device Role / Timing Role: Translating 1.8V address/control signals from SoC to 3.3V memory device, with DIR synchronized to memory access cycles. Use Value: Supports >50MHz burst transfers with sub-5ns propagation delay at 3.3V, meeting tACC timing of fast parallel memories without added wait states. |
| Flat-Panel Display Timing Controller Bridge | Ultrasound Scanner Data Acquisition Interface |
Use Scenario: Connecting a 2.5V display timing controller to a 5V video DAC and gamma correction IC in a soundbar or monitor. IC Role / Device Role / Timing Role: Level-translating RGB control and sync signals while preserving edge fidelity and minimizing skew across 8-bit parallel path. Use Value: Achieves <100ps inter-channel skew and <5ns max propagation delay variation - critical for pixel-clock-aligned video timing. | Use Scenario: Isolating analog front-end ADCs (3.3V) from digital processing FPGA (1.8V) in portable ultrasound equipment. IC Role / Device Role / Timing Role: Translating parallel digital sample data and control handshaking (RDY/ACK) between domains with strict EMI control. Use Value: Three GND pins and low 5pF input capacitance suppress switching noise coupling into sensitive analog sections, improving SNR by ≥3dB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC8T245 | Supports 1.2V–3.6V rails only; faster max speed (3.3V→3.3V: tPD = 2.8ns); no VCC isolation below 100mV. | Better suited for ultra-low-voltage mobile SoC interconnects; lacks robustness for industrial power sequencing. | Select when operating exclusively below 3.6V and requiring tighter timing margins; avoid for mixed 5V/3.3V systems. |
| TXB0108 | Auto-direction sensing (no DIR pin); supports 1.2V–3.6V; higher Ioff (±5μA); no VCCB disconnect behavior. | Reduces control pin count but adds latency (~20ns direction detection); unsuitable for deterministic real-time protocols. | Choose for simple GPIO expansion where direction changes infrequently; not recommended for synchronous bus protocols like SRAM or memory-mapped I/O. |
Compared with SN74AVC8T245 and TXB0108, the SN74LVC8T245 offers broader voltage coverage (up to 5.5V), guaranteed VCC isolation, and deterministic DIR-controlled direction - making it the only option qualified for industrial 5V legacy interface bridging with safety-critical power sequencing.
Availability
SN74LVC8T245DBRG4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded computing memory expansion, flat-panel display timing bridges, and ultrasound scanner data acquisition requiring stable component supply and long-term lifecycle support.
Supply support for SN74LVC8T245DBRG4 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 solutions with over 50 years of innovation in industrial, automotive, and communications markets.
The SN74LVC8T245 belongs to TI's LVC logic family, designed specifically for robust, low-voltage bidirectional level translation in mixed-supply systems where power sequencing reliability and wide voltage interoperability are mandatory.
FAQ
What voltage ranges can SN74LVC8T245DBRG4 translate between?
The SN74LVC8T245DBRG4 supports bidirectional translation between any two logic domains from 1.65V to 5.5V inclusive - including 1.8V↔3.3V, 1.8V↔5V, 2.5V↔5V, and 3.3V↔5V. Both VCCA and VCCB must remain within 1.65V–5.5V simultaneously; translation below 1.65V requires TI's AXC series devices.
How does SN74LVC8T245DBRG4 handle power sequencing when VCCA and VCCB are powered up at different times?
The SN74LVC8T245DBRG4 features glitch-free power sequencing: either VCCA or VCCB may be powered on/off in any order without causing spurious output transitions. If one supply is <100mV or floating while the other is active, all I/Os enter high-impedance - preventing backdrive and ensuring safe operation during staggered power-up in complex systems.
Can SN74LVC8T245DBRG4 drive standard 50Ω transmission lines directly?
No - the SN74LVC8T245DBRG4 has push-pull CMOS outputs optimized for point-to-point or lightly loaded bus connections, not 50Ω line driving. Its typical output impedance is ~20Ω, so direct 50Ω termination causes overshoot and ringing. For controlled-impedance routing, use series source termination (e.g., 33Ω resistor near driver) and keep trace lengths short (<10cm) to maintain signal integrity.
What is the maximum data rate supported by SN74LVC8T245DBRG4 in a 3.3V-to-3.3V configuration?
In a 3.3V-to-3.3V configuration (VCCA = VCCB = 3.3V), the SN74LVC8T245DBRG4 achieves typical propagation delay of 0.7–6.3ns depending on signal edge and load. With proper layout and 15pF load, it reliably supports data rates up to 100MHz for burst-mode parallel transfers, though sustained full-bus toggling at >50MHz requires careful attention to ground bounce and decoupling.
Does SN74LVC8T245DBRG4 require external pull-up or pull-down resistors on unused I/O pins?
Yes - all unused A- and B-port I/O pins on the SN74LVC8T245DBRG4 must be held at a valid logic level (VCCA, VCCB, or GND) to prevent excess ICC and ICCZ current and ensure predictable operation. Floating I/Os increase power consumption and risk metastability. TI recommends tying unused pins to GND for lowest leakage and noise immunity.
SN74LVC8T245DBRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Translation Transceiver
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 32mA
- Voltage - Supply:
- 1.65V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
SN74LVC8T245DBRG4 FAQ
1.How can I place an order for SN74LVC8T245DBRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC8T245DBRG4 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 SN74LVC8T245DBRG4 reliable?
The price and inventory of SN74LVC8T245DBRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC8T245DBRG4 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC8T245DBRG4 transactions.
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SN74LVC8T245DBRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC8T245DBRG4 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 SN74LVC8T245DBRG4?
For technical support, including SN74LVC8T245DBRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC8T245DBRG4 requirements.
6.How does Aetrix verify that SN74LVC8T245DBRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC8T245DBRG4 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 SN74LVC8T245DBRG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC8T245DBRG4?
All SN74LVC8T245DBRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC8T245DBRG4, 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 SN74LVC8T245DBRG4 part is unused and in its original packaging.
Return procedure for SN74LVC8T245DBRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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