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Home > Products > Integrated Circuits (ICs) > Logic > Translators, Level Shifters

Texas Instruments SN74AVCH2T45DCURG4

Name: SN74AVCH2T45DCURG4
Brand: Texas Instruments
SKU: SN74AVCH2T45DCURG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74AVCH2T45DCURG4

Manufacturer:: Texas Instruments

Category:: Translators, Level Shifters

Package:

Datasheet:: SN74AVCH2T45DCURG4.pdf

Description:: IC TRANSLTR BIDIRECTIONAL 8VSSOP

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Product details

Overview

SN74AVCH2T45DCURG4 from Texas Instruments is a 2-bit, dual-supply bus transceiver enabling bidirectional voltage-level translation between 1.2V–3.6V domains (e.g., 1.8V ↔ 3.3V), with 3-state outputs, V_CCA/V_CCB isolation, and active bus-hold on all data inputs - deployed in smartphone I/O expansion and server memory interface subsystems.

For engineers reviewing the SN74AVCH2T45DCURG4 datasheet, SN74AVCH2T45DCURG4 pinout, SN74AVCH2T45DCURG4 application, or SN74AVCH2T45DCURG4 equivalent, key selection criteria include configurable 2-rail operation, I_off-enabled partial power-down, 4.6V I/O tolerance, maximum 500Mbps data rate (1.8V→3.3V), and NanoFree™ VSSOP-8 package compatibility with high-density portable PCB layouts.

Technical Context

The SN74AVCH2T45DCURG4 implements asynchronous bidirectional translation via a DIR-controlled, non-inverting transceiver architecture: when DIR = low, B-port signals drive A-port outputs (B→A); when DIR = high, A-port signals drive B-port outputs (A→B). Each port tracks its dedicated supply (V_CCA, V_CCB) independently across 1.2V–3.6V.

V_CCA isolation ensures both ports enter high-impedance if either supply drops to GND; I_off limits backflow current during partial power-down; bus-hold circuitry sustains valid logic states on un-driven A1/A2/B1/B2 inputs without external resistors - critical for hot-swap and multi-drop bus reliability.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Range	V_CCA and V_CCB each support 1.2V to 3.6V - enables universal level-shifting among 1.2V/1.5V/1.8V/2.5V/3.3V nodes
I/O Voltage Tolerance	4.6V tolerant on all A/B port pins - allows safe interfacing with higher-voltage legacy peripherals
Max Data Rate	500Mbps (1.8V → 3.3V) - supports high-speed inter-domain communication in mobile SoC interfaces
Propagation Delay	t_PLH/t_PHL ≤ 2.5ns (V_CCA = V_CCB = 3.3V) - ensures timing-critical signal integrity in DDR and PCIe auxiliary paths
I_off Current	±1μA max (–40°C to 85°C) - prevents damaging back-current during system sleep or rail sequencing
Bus-Hold Strength	IBHH/IBHL ≥ ±25μA at V_IL/V_IH - maintains stable logic states without pull resistors in floating I/O scenarios
ESD Rating	±8kV HBM - meets industrial-grade robustness requirements for handheld and embedded deployment

Pinout & Package

SN74AVCH2T45DCURG4 uses the DCU package: 8-pin VSSOP (3.10mm × 2.00mm), ultra-thin profile optimized for space-constrained portable designs.

Pin/Terminal	Circuit Role	Design Meaning
1, VCCA	Supply rail A	Power source for A-port I/Os and DIR input; defines A-side logic thresholds and output swing
2, A1	Data I/O (A side)	Bidirectional signal path - output when DIR = high, input when DIR = low; level-shifted to VCCA
3, A2	Data I/O (A side)	Identical function to A1; independent channel for parallel 2-bit bus translation
4, GND	Reference ground	Common return path for both supplies; required for noise margin and ESD discharge
5, DIR	Direction control	Active-high logic input referenced to VCCA; selects A→B (DIR=H) or B→A (DIR=L) data flow
6, B2	Data I/O (B side)	Bidirectional signal path - output when DIR = low, input when DIR = high; level-shifted to VCCB
7, B1	Data I/O (B side)	Identical function to B2; second independent channel for full 2-bit bidirectional translation
8, VCCB	Supply rail B	Power source for B-port I/Os; defines B-side logic thresholds and output swing

Key Features

Feature	Design Value
Configurable dual-rail operation	Independent V_CCA and V_CCB supplies (1.2V–3.6V each) enable arbitrary voltage node pairing without external regulators
V_CCA isolation	Both A and B ports automatically enter high-Z if either V_CCA or V_CCB collapses to GND - prevents false logic injection into live buses
Active bus-hold	Eliminates need for external pull-up/pull-down resistors on A1/A2/B1/B2, reducing BOM count and board area in battery-powered systems
I_off protection	Sub-μA off-state current blocks destructive backflow during power sequencing or partial shutdown - essential for ACPI-compliant platforms
NanoFree™ packaging	Dies-as-packages (VSSOP-8) reduce thermal resistance (R_θJA = 246.9°C/W) and improve high-frequency signal integrity vs. traditional leaded packages

Applications

Smartphone Baseband Interface	Server Memory Subsystem
Use Scenario: Translating GPIO and control signals between a 1.8V application processor and 3.3V camera/sensor module. IC Role / Device Role / Timing Role: Bidirectional level shifter managing clockless, asynchronous control lines (e.g., reset, interrupt, I²C auxiliary) with sub-3ns propagation delay. Use Value: Enables direct integration of mixed-voltage peripherals without discrete resistor networks or additional LDOs - reducing bill-of-materials and PCB layer count.	Use Scenario: Isolating SMBus or PMBus configuration lines between a 3.3V baseboard management controller (BMC) and 1.2V DDR5 memory modules. IC Role / Device Role / Timing Role: Asynchronous bus transceiver providing V_CCA/V_CCB isolation and I_off protection during memory hot-plug events. Use Value: Prevents bus contention and latch-up during dynamic memory insertion/removal while maintaining signal integrity up to 320Mbps.
Desktop PC Chipset Expansion	Industrial IoT Edge Node
Use Scenario: Bridging 2.5V PCIe root complex status signals to 1.5V FPGA-based add-in card logic. IC Role / Device Role / Timing Role: Direction-controlled transceiver supporting hot-plug detection and link training handshake with <2.5ns t_PLH/t_PHL. Use Value: Guarantees setup/hold timing margins under worst-case voltage combinations (2.5V→1.5V), eliminating timing closure risk in high-speed expansion interfaces.	Use Scenario: Level-shifting UART and SPI lines between a 3.3V microcontroller and 1.8V wireless transceiver in a battery-operated sensor node. IC Role / Device Role / Timing Role: Low-quiescent-current (20μA ICCA+ICCB) translator with bus-hold sustaining idle states during deep-sleep modes. Use Value: Extends battery life by removing external biasing components and minimizing leakage during >90% duty-cycle sleep cycles.

Smartphone Baseband Interface

Server Memory Subsystem

Use Scenario: Translating GPIO and control signals between a 1.8V application processor and 3.3V camera/sensor module.

IC Role / Device Role / Timing Role: Bidirectional level shifter managing clockless, asynchronous control lines (e.g., reset, interrupt, I²C auxiliary) with sub-3ns propagation delay.

Use Value: Enables direct integration of mixed-voltage peripherals without discrete resistor networks or additional LDOs - reducing bill-of-materials and PCB layer count.

Use Scenario: Isolating SMBus or PMBus configuration lines between a 3.3V baseboard management controller (BMC) and 1.2V DDR5 memory modules.

IC Role / Device Role / Timing Role: Asynchronous bus transceiver providing V_CCA/V_CCB isolation and I_off protection during memory hot-plug events.

Use Value: Prevents bus contention and latch-up during dynamic memory insertion/removal while maintaining signal integrity up to 320Mbps.

Desktop PC Chipset Expansion

Industrial IoT Edge Node

Use Scenario: Bridging 2.5V PCIe root complex status signals to 1.5V FPGA-based add-in card logic.

IC Role / Device Role / Timing Role: Direction-controlled transceiver supporting hot-plug detection and link training handshake with <2.5ns t_PLH/t_PHL.

Use Value: Guarantees setup/hold timing margins under worst-case voltage combinations (2.5V→1.5V), eliminating timing closure risk in high-speed expansion interfaces.

Use Scenario: Level-shifting UART and SPI lines between a 3.3V microcontroller and 1.8V wireless transceiver in a battery-operated sensor node.

IC Role / Device Role / Timing Role: Low-quiescent-current (20μA ICCA+ICCB) translator with bus-hold sustaining idle states during deep-sleep modes.

Use Value: Extends battery life by removing external biasing components and minimizing leakage during >90% duty-cycle sleep cycles.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74AVC2T244DCUR	Non-configurable dual-supply (V_CCA only); no V_CCB isolation; lower max data rate (320Mbps @ 1.8V→3.3V)	Lacks independent B-rail control - unsuitable for asymmetric hot-swap or isolated domain bridging	Choose when only A-side supply control is needed and cost sensitivity outweighs isolation requirement
TXS0102DCUR	Auto-direction sensing (no DIR pin); higher propagation delay (≥6ns); no bus-hold; 3.6V max V_IO	Requires external direction logic or relies on data edge detection - incompatible with static control-line translation	Prefer for simple data-only buses where direction changes dynamically and timing slack exists

Compared with SN74AVCH2T45DCURG4, SN74AVC2T244DCUR lacks V_CCB isolation and DIR flexibility, limiting use in fault-tolerant systems; TXS0102DCUR eliminates the DIR pin but sacrifices timing performance and bus-hold stability - making SN74AVCH2T45DCURG4 optimal for deterministic, low-latency, mixed-rail control-path translation.

Availability

SN74AVCH2T45DCURG4 is available at Aetrix Electronics and suitable for smartphone baseband interfaces, server memory subsystems, and desktop PC chipset expansion requiring stable component supply, long-term lifecycle support, and TI-authorized traceability.

Supply support for SN74AVCH2T45DCURG4 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 SN74AVCH2T45DCURG4 belongs to TI's AVC/AVCH advanced CMOS logic family, engineered specifically for low-voltage, high-speed bidirectional level translation in space-constrained, power-sensitive portable and infrastructure systems.

FAQ

What voltage ranges does the SN74AVCH2T45DCURG4 support on its A and B ports?

The SN74AVCH2T45DCURG4 supports independent supply voltages from 1.2V to 3.6V on both V_CCA and V_CCB, enabling translation between any combination of 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V logic domains. This range is validated per TI's recommended operating conditions and absolute maximum ratings - ensuring reliable operation without external level-shifting circuitry.

How does the DIR pin control data flow direction in the SN74AVCH2T45DCURG4?

In the SN74AVCH2T45DCURG4, the DIR pin is referenced to V_CCA and operates as an active-high control: when DIR = high, data flows from A-port inputs to B-port outputs (A→B); when DIR = low, data flows from B-port inputs to A-port outputs (B→A). This deterministic, static control eliminates ambiguity in bidirectional protocols and avoids metastability risks associated with auto-sensing transceivers.

Does the SN74AVCH2T45DCURG4 require external pull-up or pull-down resistors on its I/O pins?

No - the SN74AVCH2T45DCURG4 integrates active bus-hold circuitry on all A1, A2, B1, and B2 pins, which maintains valid logic states on un-driven or floating inputs without external resistors. TI explicitly advises against adding pull-up/pull-down resistors, as they conflict with bus-hold functionality and may degrade noise immunity or increase power consumption.

What is the purpose of VCCA isolation in the SN74AVCH2T45DCURG4, and how does it behave?

V_CCA isolation in the SN74AVCH2T45DCURG4 ensures that if either V_CCA or V_CCB drops to GND, both A and B ports immediately enter a high-impedance state - preventing false logic levels from propagating to powered domains. This behavior is hardware-enforced and requires no firmware intervention, making it critical for hot-swap, rail sequencing, and fail-safe system architectures.

Can the SN74AVCH2T45DCURG4 be used in partial-power-down scenarios, and what specification guarantees this capability?

Yes - the SN74AVCH2T45DCURG4 is fully specified for partial-power-down operation via its I_off parameter, which limits off-state current to ±1μA maximum over –40°C to 85°C. This specification ensures that when one supply rail is inactive, damaging back-current cannot flow through the device, protecting upstream drivers and downstream loads during controlled power gating or system sleep states.

SN74AVCH2T45DCURG4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74AVCH

Package/Case:

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Translator Type:: Voltage Level

Channel Type:: Bidirectional

Number of Circuits:: 1

Channels per Circuit:: 2

Voltage - VCCA:: 1.2 V ~ 3.6 V

Voltage - VCCB:: 1.2 V ~ 3.6 V

Input Signal:: -

Output Signal:: -

Output Type:: Tri-State, Non-Inverted

Data Rate:: 500Mbps

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Features:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-VFSOP (0.091", 2.30mm Width)

SN74AVCH2T45DCURG4 FAQ

1.How can I place an order for SN74AVCH2T45DCURG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74AVCH2T45DCURG4 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 SN74AVCH2T45DCURG4 reliable?

The price and inventory of SN74AVCH2T45DCURG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVCH2T45DCURG4 is usually 5 days.

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SN74AVCH2T45DCURG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74AVCH2T45DCURG4 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 SN74AVCH2T45DCURG4?

For technical support, including SN74AVCH2T45DCURG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVCH2T45DCURG4 requirements.

6.How does Aetrix verify that SN74AVCH2T45DCURG4 is sourced from the original manufacturer or authorized distributors?

All SN74AVCH2T45DCURG4 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 SN74AVCH2T45DCURG4 meets industry standards.

7.What is the process for return or replacement of SN74AVCH2T45DCURG4?

All SN74AVCH2T45DCURG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVCH2T45DCURG4, 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 SN74AVCH2T45DCURG4 part is unused and in its original packaging.

Return procedure for SN74AVCH2T45DCURG4:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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