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Texas Instruments SN74AVC4T245PWRG4
- Part No.:
- SN74AVC4T245PWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AVC4T245PWRG4.pdf
- Description:
- IC TRANSLATION TXRX 3.6V 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,239
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Product details
Overview
SN74AVC4T245 from Texas Instruments is a 4-bit dual-supply noninverting bus transceiver enabling bidirectional voltage translation between 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V logic domains. It features independent VCCA (1.2V–3.6V) and VCCB (1.2V–3.6V) rails, 4.6V I/O tolerance, Ioff partial-power-down support, and up to 380Mbps data rate (1.8V→3.3V). It is used in low-voltage interconnects between processors and peripherals in portable electronics.
For engineers reviewing the SN74AVC4T245 datasheet, SN74AVC4T245 pinout, SN74AVC4T245 application, or SN74AVC4T245 equivalent, key selection criteria include dual-rail configurability, 3-state output control per channel, VCCA-referenced DIR/OE inputs, Ioff-enabled isolation during power sequencing, and verified 380Mbps translation performance at 1.8V-to-3.3V.
Technical Context
The SN74AVC4T245 implements two independent 2-bit bidirectional channels, each with dedicated DIR and OE controls referenced to VCCA. Its dual-rail architecture decouples A-port (VCCA-tracked) and B-port (VCCB-tracked) logic levels, enabling asynchronous translation without clocking or direction latching.
Functional mode is determined by OE (global 3-state enable) and DIR (per-channel direction select), with all I/O circuits active regardless of OE state-requiring defined logic levels on unused inputs to prevent excess ICCZ. VCC isolation ensures both ports enter high-Z if either VCCA or VCCB = GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.2V to 3.6V each - supports translation across 1.2V/1.5V/1.8V/2.5V/3.3V nodes without level-shifter redesign |
| Max Data Rate | 380Mbps (1.8V→3.3V) - enables high-speed interface bridging in USB, SDIO, and memory subsystems |
| I/O Voltage Tolerance | 4.6V - allows safe interfacing with higher-voltage legacy signals without external clamping |
| Ioff Current | ±1μA max - prevents backflow current during partial power-down, critical for hot-swap and battery-backed systems |
| ESD Rating (HBM) | 8kV - exceeds JEDEC JS-001 Class 2, reducing need for external ESD protection in handheld designs |
| Propagation Delay | 2.6ns typ (VCCA=3.3V, VCCB=2.5V) - ensures timing closure in sub-ns-critical digital interconnects |
| Operating Temp | –40°C to +85°C - qualified for industrial and extended-temperature embedded applications |
Pinout & Package
TSSOP-16 (PW) package: 5mm × 6.4mm body, 0.65mm pitch, exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction-control input (per channel) | Referenced to VCCA; high = A→B data flow, low = B→A; enables independent bidirectional control |
| 1OE, 2OE | Output-enable input (per channel) | Referenced to VCCA; high = 3-state outputs, low = active drive; supports per-channel isolation |
| 1A1–2A2 | A-port I/O (4 pins) | Referenced to VCCA; bidirectional data path for first voltage domain (e.g., 1.2V processor core) |
| 1B1–2B2 | B-port I/O (4 pins) | Referenced to VCCB; bidirectional data path for second voltage domain (e.g., 3.3V peripheral) |
| VCCA, VCCB | Power supply inputs | Independent rails; VCCA powers A-port I/Os and all control inputs (DIR/OE); VCCB powers B-port I/Os |
| GND | Ground reference | Two dedicated GND pins (pins 8 & 9) - reduces ground bounce in high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Enables simultaneous 1.2V↔3.3V, 1.8V↔2.5V, or any combination within 1.2V–3.6V range without external components |
| Per-channel DIR/OE control | Allows independent direction and 3-state management for two 2-bit buses - ideal for multiplexed address/data lines |
| Ioff and VCC isolation | Prevents current backflow and forces high-Z when either rail is unpowered - essential for robust power sequencing in multi-rail SoCs |
| 4.6V-tolerant I/Os | Eliminates need for external voltage clamps when interfacing with 5V-tolerant or legacy 3.3V systems |
| Low dynamic power | Typical Cpd = 1–15pF per transceiver - minimizes switching noise and supply current in battery-powered devices |
Applications
| Mobile Processor Interfacing | Industrial Sensor Hub |
|---|---|
Use Scenario: Connecting a 1.2V application processor to a 3.3V display interface IC in a smartphone or tablet. IC Role / Device Role / Timing Role: Bidirectional level translator for parallel RGB or DSI auxiliary control lines with per-channel direction control. Use Value: Eliminates discrete MOSFET translators, reduces BOM count, and maintains 380Mbps timing margin for touch response and display updates. | Use Scenario: Bridging a 1.8V microcontroller to multiple 2.5V analog sensor ADCs and 3.3V CAN transceivers in an industrial gateway. IC Role / Device Role / Timing Role: Dual-rail bus transceiver managing isolated I²C/SPI data paths with independent power-domain control. Use Value: Enables clean power sequencing via Ioff and VCC isolation, preventing latch-up during brownout conditions. |
| Enterprise SSD Controller | Telecom Baseband FPGA Interface |
Use Scenario: Interfacing a 1.5V NVMe controller ASIC to 1.8V NAND flash packages in a high-density SSD module. IC Role / Device Role / Timing Role: High-speed bidirectional translator for command/address and status/data lines with sub-3ns propagation delay. Use Value: Meets tight setup/hold timing budgets while supporting 1.5V/1.8V mixed-voltage NAND protocols without signal degradation. | Use Scenario: Linking a 3.3V FPGA I/O bank to a 1.2V baseband DSP in a 5G small cell radio unit. IC Role / Device Role / Timing Role: Low-skew, 4.6V-tolerant translator for JTAG, GPIO, and serial control interfaces under RF-noise-sensitive conditions. Use Value: Provides ESD-hardened (8kV HBM), low-capacitance (≤7pF) signal integrity with no external protection required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC4T245PWR | Single-supply (1.65V–3.6V), no VCCB rail; lower max speed (240Mbps), no Ioff | Limited to same-voltage-domain translation; unsuitable for asymmetric rail sequencing | Select only when both sides operate at identical voltage and partial-power-down is not required |
| TXB0104RGYR | Auto-direction sensing (no DIR pin), 1.2V–3.6V rails, lower drive strength (4mA), no 4.6V tolerance | Eliminates DIR control wiring but adds propagation delay uncertainty; less robust against overvoltage faults | Prefer for simple push-pull buses where direction is predictable; avoid in noise-prone or fault-tolerant systems |
Compared with SN74LVC4T245PWR and TXB0104RGYR, the SN74AVC4T245 provides unique support for independent rail sequencing, 4.6V I/O tolerance, and deterministic DIR-controlled direction-making it the only choice for high-reliability, mixed-voltage, hot-pluggable interconnects requiring guaranteed isolation and ESD resilience.
Availability
SN74AVC4T245 is available at Aetrix Electronics and suitable for mobile processor interfacing, industrial sensor hubs, enterprise SSD controllers, and telecom baseband FPGA interfaces requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SN74AVC4T245 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 personal electronics markets.
The SN74AVC4T245 belongs to TI's AVC (Advanced Very-low-voltage CMOS) logic family, engineered specifically for ultra-low-voltage bidirectional translation in space-constrained, power-sensitive portable and embedded systems.
FAQ
What voltage ranges does the SN74AVC4T245 support on its A and B ports?
The SN74AVC4T245 supports independent supply voltages from 1.2V to 3.6V on both VCCA (A port) and VCCB (B port), enabling translation between any pair of standard low-voltage nodes including 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V. This full-range dual-rail operation is confirmed in Section 5.3 (Recommended Operating Conditions) and Section 7.1 of the official datasheet.
How does the SN74AVC4T245 handle power sequencing when one supply rail is off?
The SN74AVC4T245 uses Ioff circuitry and VCC isolation to disable outputs and force both ports into high-impedance when either VCCA or VCCB is at GND. This prevents damaging backflow current and ensures safe partial-power-down operation-critical for battery-backed or hot-swap systems. The behavior is explicitly documented in Section 7.3.3 and Table 7-1.
What is the maximum data rate supported by the SN74AVC4T245, and under what conditions?
The SN74AVC4T245 achieves up to 380Mbps when translating from 1.8V to 3.3V, as specified in Section 1 (Features) and verified in Section 5.7–5.11 switching characteristics tables. Performance degrades to 200Mbps for sub-1.8V translations and 100Mbps when translating to 1.2V, reflecting voltage-dependent drive strength and propagation delay.
Does the SN74AVC4T245 require external pull-up resistors on DIR or OE pins?
No external pull-ups are required on DIR pins, but OE must be actively driven or pulled up to VCCA (not VCCB or another rail) to ensure high-impedance state during power-up/power-down. The datasheet recommends a VCCA-referenced pullup resistor whose value depends on the driver's sink capability-details appear in Section 3 (Description) and Figure 8-1.
Is the SN74AVC4T245 pin-compatible with other 4-bit transceivers like the SN74LVC4T245?
No-the SN74AVC4T245 is not pin-compatible with SN74LVC4T245. While both use 16-pin TSSOP (PW), the pin functions differ: SN74AVC4T245 has separate VCCA/VCCB supplies and per-channel DIR/OE, whereas SN74LVC4T245 uses a single VCC and shared DIR/OE. Pin mapping is incompatible, as shown in Figures 4-1 and 4-4 of the datasheet.
SN74AVC4T245PWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVC
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Translation Transceiver
- Number of Elements:
- 2
- Number of Bits per Element:
- 2
- 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:
- 16-TSSOP
SN74AVC4T245PWRG4 FAQ
1.How can I place an order for SN74AVC4T245PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVC4T245PWRG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74AVC4T245PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVC4T245PWRG4 is usually 5 days.
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For technical support, including SN74AVC4T245PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVC4T245PWRG4 requirements.
6.How does Aetrix verify that SN74AVC4T245PWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AVC4T245PWRG4 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 SN74AVC4T245PWRG4 meets industry standards.
7.What is the process for return or replacement of SN74AVC4T245PWRG4?
All SN74AVC4T245PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVC4T245PWRG4, 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 SN74AVC4T245PWRG4 part is unused and in its original packaging.
Return procedure for SN74AVC4T245PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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