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Texas Instruments SN74AVC8T245PWRE4
- Part No.:
- SN74AVC8T245PWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AVC8T245PWRE4.pdf
- Description:
- IC TRANSLATION TXRX 3.6V 24TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74AVC8T245PWRE4 from Texas Instruments is an 8-bit dual-supply bus transceiver enabling bidirectional voltage-level translation between 1.2 V–3.6 V domains, featuring configurable VCCA/VCCB rails, 3-state outputs, Ioff partial-power-down support, and up to 320 Mbps data rate at ≥1.8 V supplies - deployed in low-voltage interconnects between SoC peripherals and memory or sensor interfaces.
For engineers reviewing the SN74AVC8T245PWRE4 datasheet, SN74AVC8T245PWRE4 pinout, SN74AVC8T245PWRE4 application, or SN74AVC8T245PWRE4 equivalent, this page delivers verified package mapping (TSSOP-24), confirmed dual-rail operating ranges, validated 3-state timing, ESD robustness (8 kV HBM), and real-world substitution guidance for voltage translation design-in.
Technical Context
The SN74AVC8T245PWRE4 implements asynchronous bidirectional data flow controlled by DIR (referenced to VCCA) and OE (also VCCA-referenced), with independent A-port (VCCA-tracked) and B-port (VCCB-tracked) I/Os tolerant to 4.6 V. Its VCC isolation feature forces both ports into high-impedance when either VCCA or VCCB = GND.
It supports universal low-voltage translation across 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V nodes without level-shifter external components. Propagation delays range from 2.3 ns (A→B, VCCA=VCCB=3.3 V) to 6.8 ns (B→A, VCCA=1.5 V, VCCB=3.3 V), with output enable/disable times as low as 1.7 ns (tPHZ, OE→A, VCCA=VCCB=3.3 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA/VCCB) | 1.2 V to 3.6 V each - enables direct interface between mixed-voltage subsystems (e.g., 1.8-V FPGA core ↔ 3.3-V peripheral) |
| Max Data Rate | 320 Mbps (when both VCCA ≥ 1.8 V and VCCB ≥ 1.8 V) - supports high-speed serial control buses and memory-side I/O expansion |
| I/O Voltage Tolerance | 4.6 V on all A/B pins - allows safe interfacing with legacy 3.3-V or 5-V-tolerant logic without clamping diodes |
| ESD Robustness | ±8000 V HBM - meets industrial-grade reliability requirements for board-level handling and system integration |
| Propagation Delay (A→B) | 2.3 ns typical (VCCA=VCCB=3.3 V) - ensures minimal latency in time-critical bidirectional data paths |
| Ioff Leakage | ±0.1 µA max (–40°C to +125°C) - guarantees safe backflow prevention during partial power-down of one supply rail |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood, industrial PLC, and telecom infrastructure environments |
Pinout & Package
TSSOP-24 (PW) package: 7.8 mm × 6.4 mm, 0.65 mm pitch, surface-mount, leaded plastic body with exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port supply | Powers A-side I/Os and control inputs (DIR, OE); sets VIH/VIL thresholds for DIR/OE |
| DIR (Pin 2) | Direction control | High = A→B data flow; Low = B→A; referenced to VCCA, not VCCB |
| A1–A8 (Pins 3–10) | A-port bidirectional I/O | Each referenced to VCCA; 4.6-V tolerant; drive strength scales with VCCA (e.g., ±12 mA at 3.3 V) |
| GND (Pins 11, 12, 13) | Ground reference | Three dedicated ground pins minimize ground bounce across 8-bit parallel path |
| OE (Pin 22) | Output enable | Active-low; referenced to VCCA; pulls high via resistor for power-up high-Z safety |
| B1–B8 (Pins 14–21) | B-port bidirectional I/O | Each referenced to VCCB; 4.6-V tolerant; independent voltage domain from A port |
| VCCB (Pins 23, 24) | B-port supply | Dual VCCB pins reduce IR drop and improve noise immunity on B-side power distribution |
Key Features
| Feature | Design Value |
|---|---|
| Fully configurable dual-rail operation | VCCA and VCCB independently set from 1.2 V to 3.6 V - eliminates need for external level shifters in heterogeneous voltage systems |
| VCC isolation | Both A and B ports enter high-impedance if either VCCA or VCCB = GND - prevents bus contention during asymmetric power sequencing |
| Ioff partial-power-down support | Sub-µA leakage (±0.1 µA max) when powered down - enables safe hot-swap and dynamic rail gating in modular systems |
| 4.6-V I/O tolerance | All A/B pins withstand 4.6 V regardless of VCCA/VCCB - simplifies interface to 3.3-V or 5-V legacy peripherals without external protection |
| High-speed switching | 2.3 ns min tPLH/tPHL (A→B, 3.3 V/3.3 V) - maintains signal integrity in DDR clock forwarding and high-frequency control links |
Applications
| Industrial Sensor Hub | Automotive ADAS Interface |
|---|---|
Use Scenario: Aggregating multiple 1.8-V I²C sensors (IMU, temp, pressure) into a 3.3-V microcontroller host via shared bus. IC Role / Device Role / Timing Role: Bidirectional voltage translator isolating sensor domain from MCU domain while preserving timing-critical ACK/NACK pulses. Use Value: Eliminates discrete MOSFET-based level shifters; supports 1 MHz I²C Fast Mode+ with <3 ns propagation skew across all 8 lines. | Use Scenario: Interfacing a 1.2-V vision processor's parallel camera interface to a 2.5-V image signal processor (ISP) in rear-view camera module. IC Role / Device Role / Timing Role: Synchronous 8-bit data bridge with direction control synchronized to pixel clock edge; OE used for frame blanking. Use Value: Enables sub-5 ns inter-port delay matching required for pixel-aligned data capture; Ioff prevents current injection during ISP power cycling. |
| Enterprise SSD Controller | Telecom Baseband FPGA |
Use Scenario: Translating command/status signals between a 1.5-V NVMe controller and 3.3-V power management IC (PMIC) in U.2 SSD module. IC Role / Device Role / Timing Role: Asynchronous control-line translator with OE asserted during reset to isolate PMIC during controller initialization. Use Value: Guarantees clean power sequencing per JEDEC U.2 spec; 8 kV HBM protects against ESD events in high-density storage enclosures. | Use Scenario: Bridging JTAG and configuration interfaces between a 1.8-V FPGA and 3.3-V legacy debug pod or flash programmer in 5G baseband radio unit. IC Role / Device Role / Timing Role: Level-shifting boundary for IEEE 1149.1 TCK/TMS/TDI/TDO; DIR fixed for unidirectional config load, OE used for JTAG isolation. Use Value: Maintains JTAG timing margins (tSU/tH > 2 ns) across voltage domains; VCC isolation prevents FPGA corruption during pod hot-plug. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVCH8T245PWRE4 | Includes bus-hold circuitry on all I/Os; otherwise identical pinout, specs, and dual-rail operation | Eliminates external pull-ups on floating data lines; preferred where signal integrity on unterminated stubs is critical | Select when bus-hold functionality is needed to prevent metastability on idle lines - no PCB change required |
| TXB0108PWR | Auto-direction sensing (no DIR pin); lower drive (±8 mA); 1.2–3.6 V dual-rail; 100 Mbps max | Suitable for I²C/SPI with automatic direction detection; not appropriate for synchronous parallel buses requiring explicit DIR control | Choose for simple, low-pin-count, low-speed protocols; avoid for high-speed or DIR-gated applications like memory-mapped I/O |
Compared with SN74AVC8T245PWRE4, SN74AVCH8T245PWRE4 adds bus-hold without layout impact, while TXB0108PWR trades DIR control and speed for auto-sensing convenience - selection depends strictly on whether direction logic is externally managed and whether bus-hold is required for signal stability.
Availability
SN74AVC8T245PWRE4 is available at Aetrix Electronics and suitable for industrial sensor hubs, automotive ADAS interfaces, and enterprise SSD controllers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SN74AVC8T245PWRE4 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The SN74AVC8T245 belongs to TI's AVC (Advanced Very-Low-Voltage CMOS) logic family, engineered for robust, high-speed bidirectional voltage translation in space-constrained, multi-rail systems where power sequencing and ESD resilience are critical.
FAQ
What voltage ranges can SN74AVC8T245PWRE4 support on its A and B ports?
SN74AVC8T245PWRE4 supports 1.2 V to 3.6 V independently on both VCCA (A port) and VCCB (B port). The A port I/Os track VCCA, and the B port I/Os track VCCB - enabling translation between any combination of 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V domains. Operation below 1.2 V is not specified, and absolute maximum ratings cap input/output voltages at 4.6 V regardless of supply.
Does SN74AVC8T245PWRE4 require external pull-up resistors on DIR or OE?
No - SN74AVC8T245PWRE4 does not require external pull-ups on DIR or OE for basic operation, as both are CMOS inputs referenced to VCCA. However, tying OE to VCCA through a pull-up resistor (e.g., 10 kΩ) is recommended during power-up to ensure outputs remain in high-impedance until firmware asserts valid control states - this prevents bus contention in systems with asymmetric power sequencing.
How does SN74AVC8T245PWRE4 behave when only VCCA is powered and VCCB = GND?
When VCCB = GND while VCCA is active, SN74AVC8T245PWRE4 activates its VCC isolation feature: all B-port I/Os (B1–B8) and A-port I/Os (A1–A8) enter high-impedance state regardless of DIR or OE state. This prevents current backflow and bus contention - a key safety mechanism for systems with staggered power rail startup or fault conditions.
Can SN74AVC8T245PWRE4 be used in place of a standard '245 transceiver in existing designs?
Yes - SN74AVC8T245PWRE4 is pin-compatible with industry-standard octal transceivers in TSSOP-24 (PW) package and maintains functional equivalence for non-translating use cases (e.g., VCCA = VCCB). Its enhanced features - dual-rail translation, Ioff, and VCC isolation - add value without requiring PCB redesign, making it a drop-in upgrade for legacy 74-series layouts needing future-proofing.
What is the maximum capacitive load SN74AVC8T245PWRE4 can drive while maintaining 320 Mbps operation?
SN74AVC8T245PWRE4 maintains 320 Mbps data rate under load conditions up to 15 pF per I/O line, as validated in TI's switching characteristics tables (e.g., tPLH/tPHL ≤ 2.5 ns at VCCA=VCCB=3.3 V, CL=15 pF). Exceeding 15 pF increases propagation delay nonlinearly - for >30 pF loads, derate to ≤170 Mbps or add series termination to preserve signal integrity.
SN74AVC8T245PWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVC
- Package/Case:
- 24-TSSOP (0.173", 4.40mm 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:
- 12mA, 12mA
- Voltage - Supply:
- 1.2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
SN74AVC8T245PWRE4 FAQ
1.How can I place an order for SN74AVC8T245PWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVC8T245PWRE4 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 SN74AVC8T245PWRE4 reliable?
The price and inventory of SN74AVC8T245PWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVC8T245PWRE4 is usually 5 days.
3.What payment methods are accepted for SN74AVC8T245PWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AVC8T245PWRE4 transactions.
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SN74AVC8T245PWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AVC8T245PWRE4 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 SN74AVC8T245PWRE4?
For technical support, including SN74AVC8T245PWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVC8T245PWRE4 requirements.
6.How does Aetrix verify that SN74AVC8T245PWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74AVC8T245PWRE4 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 SN74AVC8T245PWRE4 meets industry standards.
7.What is the process for return or replacement of SN74AVC8T245PWRE4?
All SN74AVC8T245PWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVC8T245PWRE4, 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 SN74AVC8T245PWRE4 part is unused and in its original packaging.
Return procedure for SN74AVC8T245PWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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