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Texas Instruments SN74AVCH4T245PWE4
- Part No.:
- SN74AVCH4T245PWE4
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AVCH4T245PWE4.pdf
- Description:
- IC TRANSLATION TXRX 3.6V 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,310
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Product details
Overview
SN74AVCH4T245PWE4 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 for partial power-down operation. It supports up to 380Mbps data rate in 1.8V-to-3.3V translation and is used in mixed-voltage interconnects between processors and peripherals.
For engineers reviewing the SN74AVCH4T245PWE4 datasheet, SN74AVCH4T245PWE4 pinout, SN74AVCH4T245PWE4 application, or SN74AVCH4T245PWE4 equivalent, key selection criteria include dual-rail configurability, 3-state output control per channel, guaranteed 100mA latch-up immunity, ESD ratings (8kV HBM), and TSSOP-16 package compatibility with 5mm × 6.4mm footprint.
Technical Context
The SN74AVCH4T245PWE4 implements a fully asynchronous, direction-controlled bidirectional translation architecture: DIR inputs determine signal flow (A→B or B→A), while OE inputs independently enable/disable each 2-bit section's outputs into high-impedance state. Control logic (DIR, OE) is referenced solely to VCCA, decoupling control domain from data domain.
Its dual-rail design enables true universal low-voltage translation without external biasing-each port operates natively across 1.2V–3.6V, with I/Os tolerant to 4.6V regardless of supply. The integrated bus-hold circuitry actively maintains valid logic states on undriven A/B-port inputs, eliminating need for external pull resistors and reducing BOM count in floating-bus scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.2V to 3.6V - Enables translation between any pair of common low-voltage nodes (1.2V/1.5V/1.8V/2.5V/3.3V) without level-shifter ICs or resistive networks. |
| Max Data Rate | 380Mbps (1.8V→3.3V) - Supports high-speed interfaces like legacy parallel buses, memory expansion, or FPGA-to-ASIC interconnects requiring sub-3ns propagation delay. |
| I/O Voltage Tolerance | 4.6V - Allows safe interfacing with higher-voltage legacy peripherals or transient-tolerant systems without clamping diodes or external protection. |
| Ioff Current | ±5µA max - Ensures negligible backflow current during partial power-down, critical for hot-swap or battery-backed subsystems where one rail may be inactive. |
| Bus-Hold Current | ±25µA to ±100µA (VCCI-dependent) - Actively sustains logic state on unconnected inputs, preventing metastability and eliminating external pull resistors in space-constrained designs. |
| ESD Rating (HBM) | ±8000V - Meets industrial-grade robustness requirements for handling and board assembly without special ESD controls beyond standard practices. |
| Operating Temp | –40°C to +85°C - Qualified for extended temperature operation in industrial control, telecom infrastructure, and automotive cabin electronics. |
Pinout & Package
Packaged in a 16-pin TSSOP (PW), the SN74AVCH4T245PWE4 measures 5.0mm × 6.4mm with 0.65mm pitch, compatible with standard surface-mount reflow profiles and automated optical inspection.
| 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); defines VIH/VIL thresholds for control signals. |
| VCCB | B-port supply rail | Power source for B-side I/Os only; independent of VCCA, enabling asymmetric voltage translation (e.g., 1.2V↔3.3V). |
| 1DIR, 2DIR | Direction control inputs | Active-high logic: DIR=H enables A→B data flow; DIR=L enables B→A flow-each controls one 2-bit channel independently. |
| 1OE, 2OE | Output-enable inputs | Active-low logic: OE=L enables outputs; OE=H places corresponding 2-bit port in high-impedance state-supports dynamic bus isolation. |
| 1A1–2A2, 1B1–2B2 | Bidirectional data I/Os | 4-bit A-port (A1/A2 for channel 1; A1/A2 for channel 2) and 4-bit B-port (B1/B2 per channel); all tolerate 4.6V regardless of VCCA/VCCB. |
| GND | Ground reference | Two dedicated ground pins (pins 8 & 9) minimize ground bounce and improve noise immunity in high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent VCCA/VCCB rails (1.2–3.6V each) allow any-to-any low-voltage translation without external components or configuration registers. |
| Per-channel 3-state control | Separate 1OE/2OE and 1DIR/2DIR inputs enable granular bus management-e.g., isolate one peripheral while keeping another active on same physical bus. |
| Integrated bus-hold | Eliminates need for 8 external pull-up/pull-down resistors on data lines, reducing PCB area, BOM cost, and signal integrity risk from stubs or mismatched terminations. |
| VCC isolation | If either VCCA or VCCB drops below 0.4V, both ports auto-enter high-impedance-prevents false logic injection during power sequencing or rail collapse. |
| High-speed timing | Propagation delays as low as 2.6ns (A→B, VCCA=1.2V/VCCB=3.3V) support >300MHz clock domains when used with proper layout and load capacitance. |
Applications
| Industrial PLC Backplane Interconnect | Mobile SoC Peripheral Expansion |
|---|---|
Use Scenario: Connecting a 3.3V FPGA-based motion controller to multiple 1.8V I/O modules (ADCs, DACs, GPIO expanders) over a shared parallel bus. IC Role / Device Role / Timing Role: Bidirectional level translator managing data flow direction per module access cycle; 3-state outputs isolate inactive modules to prevent bus contention. Use Value: Eliminates discrete resistor-transistor translators and reduces interconnect latency by 40% vs. capacitive-coupled solutions, improving real-time loop response. | Use Scenario: Expanding a 1.2V application processor's GPIO and parallel camera interface to support 2.5V display drivers and 3.3V SD card slots in compact handheld devices. IC Role / Device Role / Timing Role: Voltage translator with per-port OE control allows dynamic power gating of unused peripherals, reducing standby current by up to 120µA per isolated channel. Use Value: Bus-hold circuitry prevents floating inputs during sleep mode, avoiding spurious wakeups and extending battery life without adding pull resistors. |
| Enterprise SSD Controller Interface | Automotive Infotainment Head Unit |
Use Scenario: Bridging a 1.8V NVMe controller ASIC to legacy 3.3V SATA PHY and flash memory buffers in hybrid storage modules. IC Role / Device Role / Timing Role: High-speed bidirectional translator operating at 200Mbps (1.8V→3.3V), with Ioff ensuring no current leakage when SATA link is powered down. Use Value: 8kV HBM ESD rating meets enterprise storage reliability standards; 4.6V I/O tolerance accommodates 3.3V rail overshoot during hot-plug events. | Use Scenario: Interfacing a 2.5V ADAS vision processor to 3.3V CAN transceivers and 1.5V touch controller in a vehicle head unit with strict EMC requirements. IC Role / Device Role / Timing Role: Level shifter with VCC isolation ensures B-port remains high-Z if 2.5V core rail fails, preventing fault propagation to safety-critical CAN network. Use Value: Dual-rail independence allows separate thermal management of processor and peripheral domains, simplifying heatsink design and meeting AEC-Q100 Grade 2 temp requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC4T245PWE4 | Lower max speed (240Mbps), no bus-hold, 3.6V max VCC only, no Ioff | Suitable for cost-sensitive, lower-speed designs where external pull resistors are acceptable and full power-down isolation is not required | Choose when budget constraints outweigh need for bus-hold or Ioff, and data rates stay below 240Mbps |
| TXS0104EPWR | Auto-direction sensing (no DIR pin), lower drive strength (±8mA), 1.65–3.6V VCCA/VCCB range only | Better for simple push-pull interfaces with unidirectional traffic patterns; unsuitable for bidirectional protocols requiring explicit DIR control | Prefer when direction is predictable and layout space is extremely limited-eliminates two DIR traces but sacrifices protocol flexibility |
Compared with SN74LVC4T245PWE4 and TXS0104EPWR, the SN74AVCH4T245PWE4 delivers superior mixed-voltage interoperability (1.2V–3.6V rails), higher bandwidth (380Mbps), and integrated bus-hold-Ioff makes it uniquely suited for systems requiring robust partial-power-down behavior and zero-external-resistor input termination.
Availability
SN74AVCH4T245PWE4 is available at Aetrix Electronics and suitable for industrial automation, mobile computing, enterprise storage, and automotive infotainment applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SN74AVCH4T245PWE4 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 specializing in analog, embedded processing, and connectivity technologies, with decades of experience in high-reliability interface solutions.
The SN74AVCH4T245PWE4 belongs to TI's AVC logic family, engineered specifically for low-voltage bidirectional translation in space- and power-constrained systems where rail independence, bus integrity, and robustness across voltage domains are critical.
FAQ
What voltage ranges can SN74AVCH4T245PWE4 translate between?
The SN74AVCH4T245PWE4 supports translation between any combination of 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V logic domains because its VCCA and VCCB supplies operate independently across 1.2V to 3.6V. For example, it reliably translates signals from a 1.2V microcontroller to a 3.3V sensor interface or vice versa-no external biasing or configuration is needed. This is confirmed in Section 3 and Table 5.3 of the official datasheet.
Does SN74AVCH4T245PWE4 require external pull-up or pull-down resistors on its data lines?
No, the SN74AVCH4T245PWE4 includes active bus-hold circuitry on all A- and B-port inputs, which maintains valid logic states on undriven or floating lines. Using external pull resistors with this device is explicitly discouraged in the datasheet (Section 7.3.4) as it conflicts with the internal bus-hold function and may cause excessive current draw or logic instability.
How does the Ioff feature work in SN74AVCH4T245PWE4 during partial power-down?
The Ioff feature in SN74AVCH4T245PWE4 disables output drivers when either VCCA or VCCB is at 0V, limiting off-state current to ±5µA maximum (Section 5.5). This prevents damaging backflow current through the device when one side is powered down while the other remains active-critical for hot-swap capability and battery-backed subsystems where rail sequencing is uncontrolled.
What is the maximum data rate supported by SN74AVCH4T245PWE4?
The SN74AVCH4T245PWE4 supports up to 380Mbps when translating from 1.8V to 3.3V (Section 1, Features). At other voltage combinations, maximum rates are lower: 200Mbps for <1.8V-to-3.3V, 200Mbps for translation to 2.5V or 1.8V, 150Mbps to 1.5V, and 100Mbps to 1.2V. These values are measured under specified load and timing conditions per Section 5.6–5.10.
Can SN74AVCH4T245PWE4 be used with mismatched VCCA and VCCB supply voltages?
Yes-SN74AVCH4T245PWE4 is explicitly designed for asymmetric operation: VCCA and VCCB may differ (e.g., VCCA = 1.2V, VCCB = 3.3V) without performance degradation or reliability risk. Its dual-rail architecture ensures correct logic threshold referencing (VIH/VIL tied to respective VCC), and I/Os remain tolerant to 4.6V regardless of supply levels, as verified in Absolute Maximum Ratings (Section 5.1).
SN74AVCH4T245PWE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVCH
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
SN74AVCH4T245PWE4 FAQ
1.How can I place an order for SN74AVCH4T245PWE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVCH4T245PWE4 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 SN74AVCH4T245PWE4 reliable?
The price and inventory of SN74AVCH4T245PWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVCH4T245PWE4 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AVCH4T245PWE4 transactions.
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SN74AVCH4T245PWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AVCH4T245PWE4 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 SN74AVCH4T245PWE4?
For technical support, including SN74AVCH4T245PWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVCH4T245PWE4 requirements.
6.How does Aetrix verify that SN74AVCH4T245PWE4 is sourced from the original manufacturer or authorized distributors?
All SN74AVCH4T245PWE4 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 SN74AVCH4T245PWE4 meets industry standards.
7.What is the process for return or replacement of SN74AVCH4T245PWE4?
All SN74AVCH4T245PWE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVCH4T245PWE4, 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 SN74AVCH4T245PWE4 part is unused and in its original packaging.
Return procedure for SN74AVCH4T245PWE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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