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Texas Instruments SN74LVC8T245MPWREP
- Part No.:
- SN74LVC8T245MPWREP
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC8T245MPWREP.pdf
- Description:
- IC TRANSLATION TXRX 5.5V 24TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LVC8T245MPWREP from Texas Instruments is an 8-bit dual-supply noninverting bus transceiver with configurable voltage translation and tri-state outputs. It operates across independent 1.65 V to 5.5 V rails (VCCA and VCCB), supports bidirectional level shifting between 1.8 V, 2.5 V, 3.3 V, and 5 V domains, and features VCC isolation and Ioff protection. It is used in mixed-voltage system interconnects such as FPGA-to-ASIC or microcontroller-to-peripheral interfaces.
For engineers reviewing the SN74LVC8T245MPWREP datasheet, SN74LVC8T245MPWREP pinout, SN74LVC8T245MPWREP application, or SN74LVC8T245MPWREP equivalent, key selection criteria include dual-rail voltage flexibility, direction-control logic referenced to VCCA, guaranteed high-impedance state during power sequencing, and military-grade temperature operation (–55°C to 125°C).
Technical Context
The device implements asynchronous bidirectional data flow controlled by DIR (direction) and OE (output enable), both referenced to VCCA. Its dual-rail architecture isolates A-port logic (VCCA-referenced) from B-port logic (VCCB-referenced), enabling true voltage translation without level-shifter ICs or external circuitry.
It integrates Ioff circuitry that disables outputs during partial power-down, preventing backflow current when either VCCA or VCCB is at GND. The VCC isolation feature forces all outputs into high-impedance if either supply rail collapses - a critical safety function in hot-swap or multi-rail power systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.65 V to 5.5 V each - enables translation between any combination of 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains without external biasing. |
| Propagation Delay (tPLH/tPHL) | As low as 0.3 ns (VCCA = 5 V, VCCB = 5 V) - supports high-speed interface bridging up to ~300 MHz in optimized layouts. |
| Ioff Current | ±11 μA max at –55°C to 125°C - ensures safe partial-power-down operation with no damaging backfeed current. |
| Output Drive Strength | ±32 mA at VCC = 5 V - sufficient to drive standard CMOS loads and moderate trace capacitance without buffering. |
| ESD Rating (HBM) | ±4000 V - meets industrial robustness requirements for handling and board-level integration. |
| Operating Temperature | –55°C to 125°C - qualified for extended-life military, aerospace, and harsh-environment embedded applications. |
| Package | TSSOP-24 (4.4 mm × 7.8 mm) - surface-mount compatible with automated assembly and offers thermal resistance RθJA = 90.6°C/W. |
Pinout & Package
TSSOP-24 package (PW), 4.40 mm × 7.80 mm body size, 0.65 mm lead pitch, exposed pad not present. Pin 1 = VCCA; pins 11–13 = GND; pin 22 = OE; pin 2 = DIR; A-port (pins 3–10) referenced to VCCA; B-port (pins 14–21) referenced to VCCB; VCCB supplied on pins 23 and 24.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port supply reference | Supplies A-side I/Os and control inputs (DIR, OE); sets VIH/VIL thresholds for control signals. |
| DIR (Pin 2) | Direction control input | High = A→B data flow; Low = B→A data flow; referenced to VCCA, not VCCB. |
| A1–A8 (Pins 3–10) | A-port bidirectional I/O | Each tracks VCCA; accepts 1.65–5.5 V logic levels; always active (no internal disable). |
| GND (Pins 11, 12, 13) | Ground reference | Common return for both supply rails; three dedicated pins minimize ground bounce in high-speed switching. |
| B1–B8 (Pins 14–21) | B-port bidirectional I/O | Each tracks VCCB; accepts 1.65–5.5 V logic levels; electrically isolated from A-port supply domain. |
| OE (Pin 22) | Output-enable input | Low = outputs enabled; High = all A/B outputs forced high-Z; referenced to VCCA. |
| VCCB (Pins 23, 24) | B-port supply reference | Dual connection improves current delivery and reduces impedance for B-side switching. |
Key Features
| Feature | Design Value |
|---|---|
| Fully configurable dual-rail operation | Independent VCCA and VCCB supplies (1.65–5.5 V) allow arbitrary voltage node pairing - e.g., 1.8 V MCU ↔ 5 V peripheral - without redesign. |
| VCC isolation | If either VCCA or VCCB drops to GND, all outputs automatically enter high-impedance - prevents bus contention during power sequencing faults. |
| Ioff protection | Disables output circuits during partial power-down, eliminating destructive backflow current when one rail is unpowered. |
| Control-input referencing | DIR and OE thresholds track VCCA, simplifying control logic design - no level shifters needed for control signals from A-side controller. |
| Military temperature qualification | Rated for –55°C to 125°C operation with controlled baseline, extended product life cycle, and full traceability - suitable for defense/aerospace programs. |
Applications
| Industrial PLC Backplane Interface | Avionics Data Bus Bridge |
|---|---|
|
Use Scenario: Interfacing a 3.3-V FPGA-based motion controller with legacy 5-V analog I/O modules over a shared backplane. IC Role / Device Role / Timing Role: Bidirectional voltage translator ensuring signal integrity across supply domains while maintaining timing alignment via sub-10 ns propagation delay. Use Value: Eliminates need for discrete level-shifting components and custom PCB routing; supports hot-plug capability via Ioff and VCC isolation. |
Use Scenario: Connecting a 2.5-V ARINC 429 receiver ASIC to a 5-V flight management system processor in a certified avionics module. IC Role / Device Role / Timing Role: Level-translating transceiver with guaranteed high-impedance fail-safe behavior during power-up/down sequences required by DO-254. Use Value: Meets MIL-PRF-38535 Class V requirements; eliminates risk of bus contention during dual-rail power sequencing. |
| Automotive ADAS Sensor Hub | Defense Radar Signal Processor Interface |
|
Use Scenario: Aggregating data from multiple 1.8-V image sensors into a 3.3-V SoC within an automotive camera ECU operating at 105°C ambient. IC Role / Device Role / Timing Role: Temperature-stable voltage translator enabling reliable sensor data capture with <12 ns max tPHL at 125°C junction temperature. Use Value: Maintains signal fidelity across wide temperature range; integrated ESD protection (±4 kV HBM) withstands vehicle EMI environments. |
Use Scenario: Isolating a radiation-hardened 5-V FPGA from a 3.3-V RF front-end ASIC in a phased-array radar subsystem. IC Role / Device Role / Timing Role: Dual-supply transceiver providing galvanically isolated signal path via separate VCCA/VCCB domains and guaranteed high-Z on supply loss. Use Value: Supports fault-tolerant design per MIL-STD-883; traceable lot marking and extended lifecycle ensure long-term program support. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC8T245RHLR | Lower VCC min (1.2 V), higher speed (tpd down to 2.1 ns), but rated only to 85°C and lacks Ioff and VCC isolation. | Suitable for commercial high-speed digital interconnects (e.g., PCIe add-in cards), not extended-temperature or safety-critical systems. | Select when speed > temperature range; avoid where partial-power-down or rail collapse immunity is required. |
| TXB0108PWR | Auto-direction sensing (no DIR pin), 1.2–3.6 V translation only, no military temp rating, higher ICCZ in tri-state. | Used in USB/SDIO host bridges and portable electronics where direction is predictable and voltage range is narrow. | Choose for plug-and-play simplicity in consumer designs; not viable for deterministic DIR control or 5-V compatibility. |
Compared with SN74AVC8T245RHLR and TXB0108PWR, the SN74LVC8T245MPWREP uniquely combines military temperature range, VCC isolation, Ioff, and full 1.65–5.5 V dual-rail flexibility - making it the only option for ruggedized, fail-safe, multi-voltage system interconnects.
Availability
SN74LVC8T245MPWREP is available at Aetrix Electronics and suitable for industrial automation, avionics data links, and defense electronics requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for SN74LVC8T245MPWREP 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 specializing in analog and embedded processing technologies, with leadership in high-reliability interface, power, and signal-chain solutions.
The SN74LVC8T245MPWREP belongs to TI's enhanced-product (EP) logic family, designed specifically for aerospace, defense, and industrial applications demanding extended temperature operation, controlled manufacturing, and full traceability.
FAQ
What is the maximum data rate supported by SN74LVC8T245MPWREP?
The SN74LVC8T245MPWREP does not specify a fixed data rate limit but delivers propagation delays as low as 0.3 ns under optimal conditions (VCCA = VCCB = 5 V). Real-world achievable data rates depend on load capacitance, trace length, and noise margin - typically supporting reliable operation up to 100–150 Mbps in well-designed PCB layouts. For SN74LVC8T245MPWREP, timing margins must be verified per application using the switching characteristics tables in the datasheet.
Can SN74LVC8T245MPWREP translate between 1.8 V and 5 V in both directions simultaneously?
No - SN74LVC8T245MPWREP performs unidirectional translation per transaction, controlled by the DIR pin. When DIR = HIGH, data flows A→B (e.g., 1.8 V → 5 V); when DIR = LOW, data flows B→A (e.g., 5 V → 1.8 V). Simultaneous bidirectional translation requires two devices or a different architecture. The SN74LVC8T245MPWREP enables flexible, software-controlled directionality essential for shared-bus protocols.
Is external pull-up or pull-down required on DIR or OE for reliable startup?
Yes - to ensure defined high-impedance state during power-up, OE should be tied to VCCA through a pull-up resistor (value determined by driver sink strength, typically 10 kΩ). DIR may float only if system firmware guarantees valid logic level before enabling outputs; otherwise, tie DIR to VCCA (for A→B default) or GND (for B→A default) via appropriate resistor. This prevents undefined bus states in SN74LVC8T245MPWREP during rail ramp-up.
Does SN74LVC8T245MPWREP support hot-swap insertion into a live backplane?
Yes - the integrated Ioff circuitry and VCC isolation make SN74LVC8T245MPWREP suitable for hot-swap applications. When VCCA or VCCB is unpowered, all outputs go high-Z, preventing backdrive current or bus contention. However, external hot-swap controllers and current-limiting circuitry are still recommended for full system-level compliance per IEEE 1394 or proprietary backplane standards.
How does SN74LVC8T245MPWREP handle unused I/O pins?
All A- and B-port I/Os remain electrically active regardless of OE or DIR state. Unused pins must be held at valid logic HIGH (VCCA or VCCB) or LOW (GND) to prevent floating inputs, which cause excessive ICC and potential logic instability. Control inputs (DIR, OE) must also be terminated - OE to VCCA (via pull-up) for default high-Z, DIR to VCCA or GND for fixed direction. This requirement applies strictly to SN74LVC8T245MPWREP and is documented in TI's SCBA004 application report.
SN74LVC8T245MPWREP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
SN74LVC8T245MPWREP FAQ
1.How can I place an order for SN74LVC8T245MPWREP through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC8T245MPWREP 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 SN74LVC8T245MPWREP reliable?
The price and inventory of SN74LVC8T245MPWREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC8T245MPWREP is usually 5 days.
3.What payment methods are accepted for SN74LVC8T245MPWREP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC8T245MPWREP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC8T245MPWREP?
SN74LVC8T245MPWREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC8T245MPWREP 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 SN74LVC8T245MPWREP?
For technical support, including SN74LVC8T245MPWREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC8T245MPWREP requirements.
6.How does Aetrix verify that SN74LVC8T245MPWREP is sourced from the original manufacturer or authorized distributors?
All SN74LVC8T245MPWREP 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 SN74LVC8T245MPWREP meets industry standards.
7.What is the process for return or replacement of SN74LVC8T245MPWREP?
All SN74LVC8T245MPWREP units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC8T245MPWREP, 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 SN74LVC8T245MPWREP part is unused and in its original packaging.
Return procedure for SN74LVC8T245MPWREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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