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Texas Instruments SN74AVCH4T245DR
- Part No.:
- SN74AVCH4T245DR
- Manufacturer:
- Texas Instruments
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AVCH4T245DR.pdf
- Description:
- IC TRANSLATION TXRX 3.6V 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,366
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Product details
Overview
SN74AVCH4T245DR from Texas Instruments is a 4-bit dual-supply bus transceiver enabling bidirectional voltage 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 supports up to 380Mbps (1.8V→3.3V). It is used in low-voltage interconnects between processors and peripherals in portable electronics.
For engineers reviewing the SN74AVCH4T245DR datasheet, SN74AVCH4T245DR pinout, SN74AVCH4T245DR application, or SN74AVCH4T245DR equivalent, key selection criteria include configurable dual-rail operation, Ioff partial-power-down support, 3-state output control per channel, bus-hold elimination of external resistors, and verified 380Mbps translation performance at 1.8V-to-3.3V.
Technical Context
The SN74AVCH4T245DR implements a fully asynchronous, direction-controlled bidirectional translation architecture with two independent 2-bit sections. Each section uses separate DIR and OE inputs referenced to VCCA, enabling independent control of A→B and B→A data flow. The device maintains active input circuitry on both ports at all times, requiring defined logic levels on unused inputs to prevent excess ICC/ICCZ.
VCC isolation ensures both ports enter high-impedance when either VCCA or VCCB falls below ~0.4V. Bus-hold circuitry actively sustains valid logic states on undriven A/B port inputs without external resistors-IBHL and IBHH vary predictably with supply voltage (e.g., ±25µA at 1.2V, ±100µA at 3.0V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.2V to 3.6V each - enables universal translation among 1.2V/1.5V/1.8V/2.5V/3.3V nodes without level-shifter redesign. |
| Max Data Rate | 380Mbps (1.8V→3.3V) - supports high-speed interfaces like SDIO, eMMC, or low-voltage parallel buses. |
| I/O Tolerance | 4.6V - allows safe interfacing with higher-voltage systems while powered at lower VCC. |
| Ioff Current | ±5µA max - prevents damaging backflow during partial power-down, critical for hot-swap or sleep-mode systems. |
| Bus-Hold Current | ±25µA to ±100µA (VCC-dependent) - eliminates need for external pull-up/down resistors on floating data lines. |
| ESD Rating | ±8000V HBM - meets industrial-grade robustness requirements for handling and board assembly. |
| Operating Temp | –40°C to +85°C - qualified for extended industrial temperature environments. |
Pinout & Package
SN74AVCH4T245DR is supplied in a 16-pin SOIC (D) package measuring 9.9mm × 6mm, with standard JEDEC MS-012AC footprint and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-port supply rail | Powers A-side I/Os and control inputs (DIR/OE); sets VIH/VIL thresholds for control pins. |
| VCCB | B-port supply rail | Powers B-side I/Os only; defines output voltage swing and input threshold for B-port data. |
| 1DIR, 2DIR | Direction control (I) | Active-high logic: DIR=H enables A→B; DIR=L enables B→A (per 2-bit channel). |
| 1OE, 2OE | Output enable (I) | Active-low logic: OE=L enables outputs; OE=H places corresponding port in 3-state (Hi-Z). |
| 1A1–2A2 | A-port I/O (I/O) | Data terminals referenced to VCCA; include integrated bus-hold circuitry. |
| 1B1–2B2 | B-port I/O (I/O) | Data terminals referenced to VCCB; tolerate up to 4.6V regardless of VCCB setting. |
| GND | Ground (2 pins) | Common reference for both power domains; requires low-inductance PCB connection. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent 1.2V–3.6V operation on A and B ports enables flexible interface bridging without external regulators or translators. |
| Integrated bus-hold | Eliminates external pull-up/pull-down resistors on all 8 data lines, reducing BOM count and PCB area. |
| Ioff partial-power-down | Disables I/O circuits when VCCA or VCCB = 0V, preventing current backflow into powered domains during sleep or fault conditions. |
| VCC isolation | Automatically forces both ports into Hi-Z if either VCCA or VCCB drops below ~0.4V, avoiding false logic propagation during power sequencing. |
| High-speed switching | Propagation delays as low as 2.6ns (A→B, VCCA=1.2V/VCCB=3.3V) support timing-critical low-voltage interconnects. |
Applications
| Mobile Processor Interface | Industrial Sensor Hub |
|---|---|
Use Scenario: Interfacing a 1.8V application processor with a 3.3V display controller in a handheld medical device. IC Role / Device Role / Timing Role: Bidirectional level translator managing command/data flow between processor and display over parallel RGB or SPI-like bus. Use Value: Enables direct connection without discrete MOSFET translators; 380Mbps capability supports high-resolution video timing. | Use Scenario: Aggregating multiple 1.2V/1.5V MEMS sensors into a 2.5V microcontroller-based condition monitoring node. IC Role / Device Role / Timing Role: Voltage-translating bus buffer isolating sensor domain from MCU domain while preserving signal integrity. Use Value: Bus-hold prevents floating inputs from noise-induced glitches; Ioff protects sensors during MCU sleep cycles. |
| Enterprise SSD Controller | Telecom Baseband Module |
Use Scenario: Connecting a 1.2V NVMe controller to 1.8V NAND flash memory in an enterprise SSD module. IC Role / Device Role / Timing Role: High-speed, low-latency bidirectional translator on parallel address/data bus with per-channel direction control. Use Value: Meets 380Mbps requirement for burst-mode NAND access; dual OE pins allow independent gating of command vs. data lanes. | Use Scenario: Bridging a 3.3V FPGA configuration interface to a 1.5V RF transceiver IC in a 5G small cell radio unit. IC Role / Device Role / Timing Role: Level-shifting transceiver for JTAG, SPI, or GPIO control signals between FPGA and RFIC. Use Value: 4.6V I/O tolerance safeguards FPGA pins during RFIC power-up transients; VCC isolation prevents latch-up during staggered power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC4T245DR | Lower max data rate (240Mbps), no bus-hold, VCC range 1.65–3.6V only - lacks 1.2V/1.5V compatibility. | Suitable only for 1.8V+ systems; requires external pull resistors on unused lines. | Select when cost sensitivity outweighs ultra-low-voltage support and bus-hold convenience. |
| TXB0104RGYR | Auto-direction sensing (no DIR pin), 1.2–3.6V rails, but lower drive strength (±4mA vs. ±12mA) and no Ioff. | Better for simple push-pull data links; unsuitable for systems requiring explicit direction control or partial power-down. | Choose for automatic bidirectional protocols like I²C; avoid where DIR-controlled timing or Ioff safety is mandatory. |
Compared with SN74LVC4T245DR and TXB0104RGYR, SN74AVCH4T245DR uniquely combines 1.2V operation, integrated bus-hold, Ioff protection, and 380Mbps speed - making it the only option supporting full low-voltage interoperability with robust power management in direction-controlled parallel buses.
Availability
SN74AVCH4T245DR is available at Aetrix Electronics and suitable for mobile processor interface, industrial sensor hub, enterprise SSD controller, and telecom baseband module applications requiring stable component supply across automotive-qualified, industrial, and high-reliability production programs.
Supply support for SN74AVCH4T245DR 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.
SN74AVCH4T245DR belongs to TI's AVC logic family, engineered specifically for low-voltage bidirectional level translation in space-constrained, power-sensitive applications such as portable computing and IoT edge devices.
FAQ
What voltage ranges can SN74AVCH4T245DR translate between?
SN74AVCH4T245DR supports translation between any combination of 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V logic domains. VCCA and VCCB each operate independently from 1.2V to 3.6V, enabling asymmetric configurations such as 1.2V↔3.3V or 1.8V↔2.5V. The device is not rated for 5V translation, and absolute maximum I/O voltage is 4.6V regardless of supply setting.
Does SN74AVCH4T245DR require external pull-up or pull-down resistors?
No - SN74AVCH4T245DR integrates active bus-hold circuitry on all eight data I/Os (1A1–2A2, 1B1–2B2), which maintains valid logic states on undriven or floating inputs. TI explicitly advises against using external pull resistors with bus-hold enabled, as they conflict with the internal sustaining current and may cause excessive power draw or logic instability.
How does the Ioff feature protect the system during partial power-down?
The Ioff feature in SN74AVCH4T245DR disables output drivers when either VCCA or VCCB is at 0V, limiting Ioff current to ±5µA max. This prevents damaging backflow current from a powered domain (e.g., 3.3V VCCB) into a powered-down domain (e.g., 0V VCCA), safeguarding upstream and downstream components during sleep modes, hot-plug events, or fault conditions.
Can SN74AVCH4T245DR be used in hot-swap applications?
Yes - SN74AVCH4T245DR supports hot-swap via its VCC isolation and Ioff features. When VCCA or VCCB is ramped last or disconnected, both ports automatically enter high-impedance mode, preventing false logic assertion or bus contention. Combined with ±8000V HBM ESD rating, this makes SN74AVCH4T245DR suitable for field-replaceable modules and modular backplane designs.
What is the maximum guaranteed data rate for SN74AVCH4T245DR?
The maximum guaranteed data rate for SN74AVCH4T245DR is 380Mbps, achieved specifically in 1.8V-to-3.3V translation mode under recommended operating conditions. Performance degrades at lower voltage combinations: 200Mbps for <1.8V-to-3.3V, 150Mbps for translation to 1.5V, and 100Mbps for translation to 1.2V - all specified in the official TI datasheet SCES577F.
SN74AVCH4T245DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVCH
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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-SOIC
SN74AVCH4T245DR FAQ
1.How can I place an order for SN74AVCH4T245DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVCH4T245DR 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 SN74AVCH4T245DR reliable?
The price and inventory of SN74AVCH4T245DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVCH4T245DR is usually 5 days.
3.What payment methods are accepted for SN74AVCH4T245DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AVCH4T245DR transactions.
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4.How is shipping managed for SN74AVCH4T245DR?
SN74AVCH4T245DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AVCH4T245DR 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 SN74AVCH4T245DR?
For technical support, including SN74AVCH4T245DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVCH4T245DR requirements.
6.How does Aetrix verify that SN74AVCH4T245DR is sourced from the original manufacturer or authorized distributors?
All SN74AVCH4T245DR 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 SN74AVCH4T245DR meets industry standards.
7.What is the process for return or replacement of SN74AVCH4T245DR?
All SN74AVCH4T245DR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVCH4T245DR, 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 SN74AVCH4T245DR part is unused and in its original packaging.
Return procedure for SN74AVCH4T245DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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