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Texas Instruments SN74AVCH4T245PWT
- Part No.:
- SN74AVCH4T245PWT
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AVCH4T245PWT.pdf
- Description:
- IC TRANSLATION TXRX 3.6V 16TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74AVCH4T245PWT from Texas Instruments is a 4-bit dual-supply bus transceiver enabling bidirectional voltage-level translation between 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V domains. It features independent VCCA (1.2–3.6V) and VCCB (1.2–3.6V) rails, 4.6V I/O tolerance, bus-hold circuitry, and Ioff partial-power-down support. It is used in low-voltage interconnects between processors and peripherals in portable electronics and industrial controllers.
For engineers reviewing the SN74AVCH4T245PWT datasheet, SN74AVCH4T245PWT pinout, SN74AVCH4T245PWT application, or SN74AVCH4T245PWT equivalent, key selection criteria include configurable dual-rail operation, 380Mbps max data rate (1.8V→3.3V), 3-state output control via DIR/OE, Ioff-enabled isolation, and TSSOP-16 package compatibility with 5mm × 6.4mm footprint.
Technical Context
The SN74AVCH4T245PWT implements asynchronous bidirectional translation using two independent supply domains: A-port I/Os and control inputs (1DIR, 2DIR, 1OE, 2OE) reference VCCA; B-port I/Os reference VCCB. Direction is controlled per 2-bit section by DIR inputs, while OE enables/disables outputs into high-impedance state. Both ports remain active regardless of direction mode.
VCC isolation ensures both A and B ports enter high-impedance when either VCCA or VCCB falls below ~0.4V. Bus-hold circuitry actively maintains valid logic states on undriven inputs without external resistors, and Ioff blocks current backflow during partial power-down - critical for hot-swap and multi-rail system integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA/VCCB) | 1.2V to 3.6V each - enables universal translation among 1.2V/1.5V/1.8V/2.5V/3.3V nodes without level-shifter ICs. |
| I/O Voltage Tolerance | 4.6V - allows safe interfacing with higher-voltage legacy signals or transient overshoot without clamping diodes. |
| Max Data Rate | 380Mbps (1.8V→3.3V) - supports high-speed serial links like SDIO, eMMC, or low-latency sensor buses. |
| Bus-Hold Current | ±25µA to ±100µA (VCCI-dependent) - eliminates need for external pull resistors, reducing BOM count and board space. |
| Ioff Leakage | ±0.1µA typical - prevents damaging back-current when one rail is powered down, enabling safe partial-power sequencing. |
| ESD Rating (HBM) | ±8000V - exceeds JEDEC Class 2 latch-up immunity, suitable for handheld and field-deployable equipment. |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive cabin applications without derating. |
Pinout & Package
Packaged in a 16-pin TSSOP (PW), the SN74AVCH4T245PWT measures 5mm × 6.4mm with standard 0.65mm pitch and exposed pad not present. Pin numbering follows JEDEC MO-153, top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-port supply rail | Power source for A-side I/Os and all control inputs (1DIR, 2DIR, 1OE, 2OE); sets VIH/VIL thresholds. |
| VCCB | B-port supply rail | Power source for B-side I/Os only; defines output swing and input threshold referencing for B port. |
| 1DIR, 2DIR | Direction control (per 2-bit channel) | High = A→B data flow; Low = B→A flow; referenced to VCCA, not VCCB. |
| 1OE, 2OE | Output enable (per 2-bit channel) | High = 3-state (Hi-Z) on respective port; low = active drive; referenced to VCCA. |
| 1A1–2A2 | A-port bidirectional I/Os | 4-bit A-side interface; tolerate up to 4.6V regardless of VCCA setting; include bus-hold. |
| 1B1–2B2 | B-port bidirectional I/Os | 4-bit B-side interface; tolerate up to 4.6V regardless of VCCB setting; include bus-hold. |
| GND | Ground reference | Two dedicated pins (pins 8 & 9) provide low-inductance return path for both supply domains. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent 1.2–3.6V operation on A and B ports enables seamless interoperability across five common logic families without external biasing. |
| Integrated bus-hold | Eliminates need for 8 external pull-up/pull-down resistors on data lines, reducing layout complexity and improving noise immunity on floating inputs. |
| Ioff partial-power-down | Disables I/Os when VCCA or VCCB = 0V, preventing reverse current injection into powered rails during hot-plug or sleep-mode transitions. |
| VCC isolation | Forces both ports into Hi-Z if either VCCA or VCCB drops below ~0.4V - avoids false logic propagation during asymmetric power sequencing. |
| 4.6V-tolerant I/Os | Supports connection to 5V-tolerant systems or transient overvoltage events without damage or signal corruption. |
Applications
| Mobile Processor Interfacing | Industrial Sensor Hub |
|---|---|
Use Scenario: Connecting a 1.8V application processor to a 3.3V display interface or camera module in smartphones or tablets. IC Role / Device Role / Timing Role: Bidirectional level translator managing command/data flow between mismatched voltage domains with sub-3ns propagation delay. Use Value: Enables direct integration without discrete FET translators or resistor networks, saving PCB area and reducing signal integrity risk at >100MHz clock rates. | Use Scenario: Aggregating multiple 1.2V/1.5V MEMS sensors (accelerometer, gyroscope, temp) onto a 2.5V microcontroller bus in factory automation equipment. IC Role / Device Role / Timing Role: Voltage-translating bus buffer with bus-hold maintaining stable logic states during sensor sleep/wake transitions. Use Value: Prevents floating inputs from causing spurious interrupts or MCU resets, eliminating need for 16 external pull resistors and associated layout routing. |
| Enterprise SSD Controller | Telecom Baseband Interface |
Use Scenario: Bridging a 1.2V NVMe controller to 1.8V NAND flash memory in enterprise solid-state drives. IC Role / Device Role / Timing Role: High-speed bidirectional transceiver supporting 380Mbps data bursts with precise OE-controlled timing alignment. Use Value: Meets tight setup/hold timing margins required for UFS/NAND protocols while maintaining signal integrity across mixed-voltage signaling paths. | Use Scenario: Interfacing a 3.3V FPGA baseband processor to 1.8V RF transceiver ICs in small-cell wireless infrastructure. IC Role / Device Role / Timing Role: Asynchronous level shifter with Ioff protection during FPGA reconfiguration or RFIC power cycling. Use Value: Ensures clean isolation during dynamic power management, preventing latch-up or data corruption during simultaneous domain reinitialization. |
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 (1.65–3.6V), no VCCA/VCCB separation; lacks Ioff and VCC isolation. | Suitable only for same-voltage-domain buffering; cannot translate between disparate rails like 1.2V↔3.3V. | Select when cost sensitivity outweighs dual-rail flexibility and partial-power-down requirements. |
| TXB0104RGYR | Auto-direction sensing (no DIR pin), lower drive strength (±2mA vs ±12mA), smaller 14-pin VQFN. | Better for low-pin-count, low-power I²C/SPI translation; unsuitable for high-speed parallel buses due to weaker drive and auto-sensing latency. | Prefer for space-constrained, low-data-rate interfaces where direction control overhead must be eliminated. |
Compared with SN74LVC4T245PWR and TXB0104RGYR, the SN74AVCH4T245PWT uniquely supports true dual-rail translation with Ioff and VCC isolation - essential for robust operation in multi-voltage SoC subsystems requiring glitch-free power sequencing and hot-swap capability.
Availability
SN74AVCH4T245PWT is available at Aetrix Electronics and suitable for mobile computing, industrial sensor aggregation, enterprise storage, and telecom baseband applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SN74AVCH4T245PWT 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 and embedded processing solutions for industrial, automotive, personal electronics, and communications markets.
The SN74AVCH4T245PWT belongs to TI's AVC logic family, engineered specifically for low-voltage, high-speed bidirectional level translation in battery-powered and multi-rail digital systems where power sequencing, signal integrity, and board-space efficiency are critical.
FAQ
What voltage ranges does the SN74AVCH4T245PWT support on its A and B ports?
The SN74AVCH4T245PWT supports independent supply voltages from 1.2V to 3.6V on both VCCA (A port) and VCCB (B port). This allows translation between any combination of 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V logic domains. The device remains fully functional even when VCCA and VCCB are set to different values within that range, and it operates reliably down to 1.2V on either rail.
Does the SN74AVCH4T245PWT require external pull-up or pull-down resistors on its data lines?
No, the SN74AVCH4T245PWT includes active bus-hold circuitry on all A- and B-port I/Os, which maintains valid logic states on undriven or unused inputs without external resistors. Using pull-up or pull-down resistors with the SN74AVCH4T245PWT is explicitly discouraged in the datasheet, as they may interfere with bus-hold functionality and increase power consumption unnecessarily.
How does the Ioff feature function in the SN74AVCH4T245PWT during partial power-down?
The Ioff feature in the SN74AVCH4T245PWT disables the output drivers when either VCCA or VCCB is at 0V, blocking current backflow between powered and unpowered rails. This prevents damage to upstream components and ensures signal integrity during hot-swap or sleep-mode transitions. Ioff leakage is specified at ±0.1µA typical, making the SN74AVCH4T245PWT suitable for systems requiring strict power-domain isolation.
Can the SN74AVCH4T245PWT translate signals from 1.2V to 3.3V bidirectionally?
Yes, the SN74AVCH4T245PWT supports full bidirectional translation between 1.2V and 3.3V domains. When VCCA = 1.2V and VCCB = 3.3V, it translates A→B (1.2V→3.3V) and B→A (3.3V→1.2V) under DIR control. Switching characteristics are characterized down to 1.2V, with tPLH/tPHL ≤ 3.6ns (typical) and tPHZ/tPLZ ≤ 5.6ns (typical) in this configuration, ensuring reliable operation in low-voltage IoT edge nodes.
What is the maximum data rate supported by the SN74AVCH4T245PWT, and under what conditions?
The SN74AVCH4T245PWT supports up to 380Mbps when translating from 1.8V to 3.3V (VCCA = 1.8V, VCCB = 3.3V). Lower rates apply for other combinations: 200Mbps for <1.8V→3.3V or ↔2.5V/1.8V, 150Mbps for ↔1.5V, and 100Mbps for ↔1.2V. These values reflect guaranteed timing performance under recommended operating conditions, not theoretical limits.
SN74AVCH4T245PWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVCH
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
SN74AVCH4T245PWT FAQ
1.How can I place an order for SN74AVCH4T245PWT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVCH4T245PWT 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 SN74AVCH4T245PWT reliable?
The price and inventory of SN74AVCH4T245PWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVCH4T245PWT is usually 5 days.
3.What payment methods are accepted for SN74AVCH4T245PWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AVCH4T245PWT transactions.
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4.How is shipping managed for SN74AVCH4T245PWT?
SN74AVCH4T245PWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AVCH4T245PWT 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 SN74AVCH4T245PWT?
For technical support, including SN74AVCH4T245PWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVCH4T245PWT requirements.
6.How does Aetrix verify that SN74AVCH4T245PWT is sourced from the original manufacturer or authorized distributors?
All SN74AVCH4T245PWT 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 SN74AVCH4T245PWT meets industry standards.
7.What is the process for return or replacement of SN74AVCH4T245PWT?
All SN74AVCH4T245PWT units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVCH4T245PWT, 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 SN74AVCH4T245PWT part is unused and in its original packaging.
Return procedure for SN74AVCH4T245PWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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