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Texas Instruments SN74AVCH4T245PW
- Part No.:
- SN74AVCH4T245PW
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AVCH4T245PW.pdf
- Description:
- IC TRANSLATION TXRX 3.6V 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:796
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Product details
Overview
SN74AVCH4T245PW 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 on all data inputs, and Ioff for partial power-down operation. It supports up to 380Mbps data rate in 1.8V→3.3V translation and is used in mixed-voltage interconnects between processors and peripherals.
For engineers reviewing the SN74AVCH4T245PW datasheet, SN74AVCH4T245PW pinout, SN74AVCH4T245PW application, or SN74AVCH4T245PW equivalent, key selection criteria include dual-rail configurability, guaranteed 3-state behavior during power sequencing, bus-hold elimination of external resistors, VCC isolation under undervoltage, and verified 100–380Mbps throughput across voltage combinations.
Technical Context
The SN74AVCH4T245PW implements asynchronous bidirectional translation using two independent supply domains: A-port I/Os and control pins (1DIR, 2DIR, 1OE, 2OE) are referenced to VCCA; B-port I/Os are referenced to VCCB. Direction control is per-channel (1DIR/2DIR), with output enable (1OE/2OE) disabling respective port outputs into high-impedance.
VCC isolation ensures both ports enter high-Z if either VCCA or VCCB falls below ~0.4V. Bus-hold circuitry actively sustains logic states on undriven A/B data inputs without external biasing-IBHL/IBHH currents range from ±15µA to ±100µA depending on VCC and input voltage, eliminating need for pull-up/pull-down resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA/VCCB) | 1.2V to 3.6V each - enables translation between any pair of 1.2V/1.5V/1.8V/2.5V/3.3V nodes |
| I/O Voltage Tolerance | 4.6V - allows safe interfacing with higher-voltage systems without level-shifter front-end |
| Max Data Rate | 380Mbps (1.8V→3.3V) - supports high-speed serial links like SDIO, eMMC, or low-latency peripheral buses |
| Bus-Hold Current | ±25µA to ±100µA - actively holds floating inputs at valid logic levels, removing need for external biasing |
| Ioff Leakage | ±0.1µA max - prevents backflow current during partial power-down, protecting powered-down subsystems |
| ESD Rating (HBM) | ±8000V - exceeds JEDEC JESD22-A114A, suitable for handling in non-ESD-controlled environments |
| Operating Temp | –40°C to +85°C - qualified for industrial and extended-temperature embedded applications |
Pinout & Package
PW package is a 16-pin TSSOP (5mm × 6.4mm) with exposed pad option not specified; lead finish is NiPdAu, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-port supply rail | Power source for A-side I/Os and 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 data |
| 1DIR, 2DIR | Direction control (per channel) | High = A→B data flow; Low = B→A data flow; referenced to VCCA, not VCCB |
| 1OE, 2OE | Output enable (per channel) | High = corresponding port (1 or 2) in high-impedance; critical for power sequencing and bus arbitration |
| 1A1–2A2 | A-port bidirectional I/Os | Data lines referenced to VCCA; tolerate up to 4.6V regardless of VCCA setting |
| 1B1–2B2 | B-port bidirectional I/Os | Data lines referenced to VCCB; tolerate up to 4.6V regardless of VCCB setting |
| GND (pins 8,9) | Ground reference | Common return for both supplies; must be low-inductance connection to avoid ground bounce |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent 1.2–3.6V VCCA and VCCB rails enable any-to-any low-voltage node bridging without external regulators |
| Integrated bus-hold | Active circuitry on all 8 data I/Os eliminates need for external pull-up/pull-down resistors, reducing BOM count and board area |
| VCC isolation | Automatic high-Z on both ports if either VCCA or VCCB drops below ~0.4V - prevents false logic injection during power ramp |
| Ioff partial power-down | Sub-µA leakage (<0.1µA) when VCC = 0V blocks damaging back-current from live bus into unpowered domain |
| 4.6V I/O tolerance | Withstands overvoltage events up to 4.6V on any I/O pin - simplifies interface with legacy 5V-tolerant peripherals |
Applications
| Mobile Processor Interface | Industrial PLC Backplane |
|---|---|
Use Scenario: Interfacing a 1.8V application processor with a 3.3V sensor hub or display controller in a handheld device. IC Role / Device Role / Timing Role: Bidirectional level translator managing command/response traffic on shared data bus with direction switching per transaction. Use Value: Eliminates discrete resistor networks and saves PCB space while supporting 380Mbps burst transfers required for camera sensor streaming. | Use Scenario: Connecting a 2.5V FPGA I/O bank to a 3.3V analog I/O module in an industrial programmable logic controller. IC Role / Device Role / Timing Role: Voltage-translating bus buffer ensuring signal integrity across mixed-supply subsystems in noisy factory environments. Use Value: Bus-hold prevents floating inputs during hot-swap events; Ioff protects FPGA during module power cycling without system reset. |
| Enterprise SSD Controller | Telecom Baseband Unit |
Use Scenario: Bridging 1.2V NVMe controller logic to 1.8V NAND flash memory interface in enterprise solid-state drives. IC Role / Device Role / Timing Role: High-speed bidirectional translator enabling low-latency read/write commands and status responses on shared address/data bus. Use Value: Verified 200Mbps performance at 1.2V→1.8V translation meets JEDEC UFS timing margins without added delay or skew. | Use Scenario: Level-shifting between a 1.5V baseband DSP and 2.5V RF front-end IC in 4G/5G small cell equipment. IC Role / Device Role / Timing Role: Asynchronous voltage translator isolating supply domains while maintaining deterministic propagation delay (tPLH/tPHL ≤ 3.6ns @ 1.5V→2.5V). Use Value: VCC isolation prevents RF noise coupling into DSP domain during VCCB transient events, improving EMI robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional voltage translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC4T245PW | Single-supply (VCC only); no dual-rail support; max 3.6V VCC; no VCC isolation or Ioff | Only suitable for same-voltage-domain buffering or simple 3.3V↔1.8V translation with external biasing | Select only if both sides share one supply and bus-hold/Ioff are unnecessary |
| TXS0104EPW | Auto-direction sensing (no DIR pin); lower drive strength (±8mA vs ±12mA); no bus-hold | Used where direction is data-dependent (e.g., I²C), not control-line driven; requires external pull-ups | Choose for open-drain-like protocols; avoid when deterministic DIR control or bus-hold is required |
Compared with SN74LVC4T245PW and TXS0104EPW, the SN74AVCH4T245PW uniquely delivers configurable dual-rail operation, integrated bus-hold, VCC isolation, and Ioff - making it the only choice for robust, mixed-supply, direction-controlled interconnects requiring zero external biasing and fail-safe power sequencing.
Availability
SN74AVCH4T245PW is available at Aetrix Electronics and suitable for mobile processor interface, industrial PLC backplane, enterprise SSD controller, and telecom baseband unit applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SN74AVCH4T245PW 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 SN74AVCH4T245PW belongs to TI's AVC logic family, designed specifically for low-voltage, high-speed bidirectional level translation in mixed-supply systems where power sequencing, bus stability, and ESD robustness are critical.
FAQ
What voltage ranges does the SN74AVCH4T245PW support on its A and B ports?
The SN74AVCH4T245PW supports independent supply voltages from 1.2V to 3.6V on both VCCA (A port) and VCCB (B port). This enables translation between any combination of common low-voltage nodes - including 1.2V↔1.5V, 1.5V↔1.8V, 1.8V↔2.5V, 2.5V↔3.3V, and 1.2V↔3.3V - without external components. The SN74AVCH4T245PW datasheet specifies absolute maximum ratings up to 4.6V on all I/Os, allowing safe overvoltage tolerance beyond the supply rails.
How does the SN74AVCH4T245PW handle power sequencing when VCCA and VCCB ramp at different times?
The SN74AVCH4T245PW incorporates VCC isolation: if either VCCA or VCCB falls below ~0.4V, both A and B ports automatically enter high-impedance state. This prevents false logic levels or back-driving during asymmetric power-up/down. Additionally, Ioff limits leakage to <0.1µA when one supply is at 0V, protecting powered domains. For reliable startup, tie OE to VCCA via a pull-up resistor - the SN74AVCH4T245PW's internal circuitry ensures outputs remain disabled until both supplies stabilize.
Does the SN74AVCH4T245PW require external pull-up or pull-down resistors on its data lines?
No, the SN74AVCH4T245PW includes active bus-hold circuitry on all eight data I/Os (1A1–2A2, 1B1–2B2), which maintains valid logic states on undriven or floating inputs without external resistors. TI specifies IBHL and IBHH currents from ±15µA to ±100µA depending on VCC and input voltage - sufficient to override noise and prevent metastability. Using external pull-ups/pull-downs with the SN74AVCH4T245PW is explicitly discouraged in the datasheet, as it may conflict with bus-hold behavior and increase power consumption.
What is the maximum data rate supported by the SN74AVCH4T245PW, and under what conditions?
The SN74AVCH4T245PW supports up to 380Mbps when translating from 1.8V to 3.3V (VCCA = 1.8V, VCCB = 3.3V), as confirmed in Section 1 of the datasheet. Other validated rates include 200Mbps for <1.8V→3.3V, 200Mbps for translation to 2.5V or 1.8V, 150Mbps to 1.5V, and 100Mbps to 1.2V. These values reflect guaranteed AC performance under recommended operating conditions (–40°C to +85°C, proper bypassing); actual system-level throughput depends on trace length, loading, and signal integrity design around the SN74AVCH4T245PW.
Can the SN74AVCH4T245PW be used in place of the SN74LVC4T245PW in an existing design?
Not as a drop-in replacement: the SN74AVCH4T245PW uses dual supplies (VCCA/VCCB) and has different pin functions (e.g., DIR referenced to VCCA only), whereas the SN74LVC4T245PW is single-supply (VCC) with DIR referenced to that same VCC. Swapping requires redesigning power distribution, updating control logic, and verifying timing margins. However, the SN74AVCH4T245PW offers superior features - bus-hold, Ioff, VCC isolation - making it preferable for new designs with mixed-voltage domains. Always validate the SN74AVCH4T245PW in-system before migration.
SN74AVCH4T245PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVCH
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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
SN74AVCH4T245PW FAQ
1.How can I place an order for SN74AVCH4T245PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVCH4T245PW 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 SN74AVCH4T245PW reliable?
The price and inventory of SN74AVCH4T245PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVCH4T245PW is usually 5 days.
3.What payment methods are accepted for SN74AVCH4T245PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AVCH4T245PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AVCH4T245PW?
SN74AVCH4T245PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AVCH4T245PW 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 SN74AVCH4T245PW?
For technical support, including SN74AVCH4T245PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVCH4T245PW requirements.
6.How does Aetrix verify that SN74AVCH4T245PW is sourced from the original manufacturer or authorized distributors?
All SN74AVCH4T245PW 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 SN74AVCH4T245PW meets industry standards.
7.What is the process for return or replacement of SN74AVCH4T245PW?
All SN74AVCH4T245PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVCH4T245PW, 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 SN74AVCH4T245PW part is unused and in its original packaging.
Return procedure for SN74AVCH4T245PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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