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Texas Instruments SN74AVCH1T45DBVR
- Part No.:
- SN74AVCH1T45DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74AVCH1T45DBVR.pdf
- Description:
- IC TRANSLATOR BIDIR SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74AVCH1T45 from Texas Instruments is a single-bit, dual-supply noninverting bus transceiver enabling bidirectional voltage translation between 1.2V–3.6V rails (e.g., 1.2V ↔ 3.3V). It features configurable level-shifting, 3-state outputs, bus-hold on data I/Os, VCC isolation, and Ioff for partial-power-down operation. Used in low-voltage interconnects between SoC peripherals and memory or sensor interfaces.
For engineers reviewing the SN74AVCH1T45 datasheet, SN74AVCH1T45 pinout, SN74AVCH1T45 application, or SN74AVCH1T45 equivalent, key selection criteria include dual-rail supply flexibility (VCCA/VCCB = 1.2–3.6V), 4.6V I/O tolerance, bus-hold elimination of external resistors, VCC isolation behavior, and verified 500Mbps max data rate in 1.8V→3.3V translation.
Technical Context
The SN74AVCH1T45 implements a fully configurable dual-rail architecture where A-port logic levels track VCCA (1.2V–3.6V) and B-port levels track VCCB (1.2V–3.6V); DIR input is referenced solely to VCCA. Its bus-hold circuitry actively sustains undriven inputs at valid logic states without external biasing.
VCC isolation forces both ports into high-impedance when either VCCA or VCCB is at GND, while Ioff limits power-off leakage to ±5μA per port. Propagation delays range from 0.2ns (3.3V→3.3V) to 8.5ns (1.2V→1.2V), with disable times up to 13.6ns depending on rail combinations.
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, and 3.3V domains |
| Max Data Rate | 500Mbps (1.8V→3.3V) - supports high-speed low-voltage interconnects in portable electronics |
| I/O Voltage Tolerance | 4.6V - allows safe interfacing with higher-voltage legacy signals without clamping diodes |
| Bus-Hold Current | ±25μA to ±100μA (VCCA-dependent) - eliminates need for external pullup/pulldown resistors on A/B ports |
| Ioff Leakage | ±5μA max per port at 0V supply - ensures robust partial-power-down mode for system-level power gating |
| ESD Rating (HBM) | ±2000V - meets industrial-grade ESD immunity requirements per JESD22-A114 |
| Propagation Delay | 0.2ns to 8.5ns (rail- and direction-dependent) - enables timing-critical bidirectional data paths in mixed-voltage systems |
Pinout & Package
SN74AVCH1T45DBVR uses the DBV (SOT-23-6) package: 2.90mm × 1.60mm body, 0.95mm height, gull-wing leads. Pin 1 = VCCA, Pin 2 = GND, Pin 3 = A, Pin 4 = VCCB, Pin 5 = DIR, Pin 6 = B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port supply reference | Sets logic thresholds and output drive strength for A-side I/O; accepts 1.2V–3.6V |
| GND (Pin 2) | Common ground reference | Return path for both supply rails; required for stable bus-hold and Ioff operation |
| A (Pin 3) | Bidirectional data I/O (A side) | Connects to 1.2V–3.6V domain; includes integrated bus-hold; 4.6V tolerant |
| VCCB (Pin 4) | B-port supply reference | Sets logic thresholds and output drive strength for B-side I/O; accepts 1.2V–3.6V |
| DIR (Pin 5) | Direction control input | Referenced to VCCA; high = A→B, low = B→A; no internal pullup/pulldown required |
| B (Pin 6) | Bidirectional data I/O (B side) | Connects to independent 1.2V–3.6V domain; includes integrated bus-hold; 4.6V tolerant |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent VCCA/VCCB supplies (1.2V–3.6V) enable any-to-any low-voltage level shifting without external components |
| Integrated bus-hold | Eliminates external pullup/pulldown resistors on A/B ports, reducing BOM count and PCB area in space-constrained designs |
| VCC isolation | Outputs go high-Z if either VCCA or VCCB is at GND - prevents backdrive and latch-up during power sequencing |
| Ioff partial-power-down | Blocks current flow between powered/unpowered rails (≤±5μA leakage), supporting dynamic power management in battery-powered systems |
| NanoFree™ packaging | Die-as-package construction reduces footprint (2.90mm × 1.60mm) and thermal resistance (RθJA = 210.5°C/W) for compact, thermally efficient layouts |
Applications
| Mobile Processor Interfacing | Low-Power Sensor Hub |
|---|---|
Use Scenario: Connecting a 1.8V application processor GPIO bank to a 3.3V display interface IC. IC Role / Device Role / Timing Role: Bidirectional level translator ensuring signal integrity across voltage domains during read/write cycles. Use Value: Enables direct interface without discrete FET translators or resistor networks, saving 2.5mm² PCB area and reducing signal propagation skew by ≤3ns vs. discrete solutions. | Use Scenario: Isolating a 1.2V wearable MCU from multiple 1.8V/2.5V environmental sensors during sleep mode. IC Role / Device Role / Timing Role: Voltage translator with Ioff and VCC isolation, allowing MCU to power down VCCA while sensors remain active on VCCB. Use Value: Reduces system standby current by eliminating cross-rail leakage; bus-hold maintains sensor bus state without wake-up interrupts. |
| Industrial PLC I/O Expansion | Enterprise SSD Controller Interface |
Use Scenario: Bridging a 3.3V FPGA configuration bus to 1.5V I²C EEPROM and 2.5V status LEDs. IC Role / Device Role / Timing Role: Single-device multi-rail translator replacing two discrete level shifters in modular I/O daughter cards. Use Value: Cuts component count by 50%, simplifies layout routing, and guarantees <8ns max propagation delay across all supported rail combinations. | Use Scenario: Translating command/address signals between a 1.8V NVMe controller and 3.3V power management IC in enterprise SSD modules. IC Role / Device Role / Timing Role: High-speed bidirectional translator with 500Mbps capability and 4.6V I/O tolerance for robustness against supply ripple. Use Value: Supports PCIe Gen4 timing margins with sub-3ns typical tPLH/tPHL at 1.8V→3.3V, eliminating need for active termination or repeaters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXS0101DBVR | Auto-direction sensing (no DIR pin); lower max data rate (24Mbps); no VCC isolation | Best for unidirectional or simple push-pull I²C/SPI lines; unsuitable for controlled bidirectional buses requiring explicit direction control | Select SN74AVCH1T45 when explicit DIR control, VCC isolation, or >24Mbps throughput is required |
| SN74LVC1T45DBVR | Single-supply only (VCC = 1.65–5.5V); no dual-rail support; lacks bus-hold and Ioff | Applicable only when both sides share same supply; cannot translate between disparate voltages like 1.2V↔3.3V | Choose SN74AVCH1T45 for true dual-voltage domain bridging with power-aware features |
Compared with TXS0101DBVR and SN74LVC1T45DBVR, SN74AVCH1T45 uniquely combines explicit DIR control, full dual-rail independence (1.2V–3.6V per rail), VCC isolation, and bus-hold-making it the only option for robust, high-speed, mixed-voltage bidirectional data paths in power-managed systems.
Availability
SN74AVCH1T45 is available at Aetrix Electronics and suitable for mobile processor interfacing, low-power sensor hubs, industrial PLC I/O expansion, and enterprise SSD controller interfaces requiring stable component supply and long-term production continuity.
Supply support for SN74AVCH1T45 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 SN74AVCH1T45 belongs to TI's AVC logic family, engineered specifically for ultra-low-voltage bidirectional translation in space- and power-constrained portable and IoT devices.
FAQ
What voltage ranges does the SN74AVCH1T45 support on its VCCA and VCCB supplies?
The SN74AVCH1T45 supports independent supply voltages from 1.2V to 3.6V on both VCCA and VCCB pins. This enables translation between any combination of common low-voltage rails-including 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V-without external components. Operation outside this range violates absolute maximum ratings and may cause permanent damage to the SN74AVCH1T45.
How does the DIR pin function in the SN74AVCH1T45, and what supply references it?
The DIR pin on the SN74AVCH1T45 controls data direction: logic high enables transmission from A to B, and logic low enables transmission from B to A. Critically, DIR is referenced to VCCA-not VCCB-so its VIH/VIL thresholds scale with the A-port supply. This ensures reliable control even when VCCA and VCCB differ significantly, a key distinction from single-supply translators. The SN74AVCH1T45 requires no external pullup or pulldown on DIR.
Does the SN74AVCH1T45 require external pullup or pulldown resistors on its A and B ports?
No, the SN74AVCH1T45 includes active bus-hold circuitry on both A and B ports, which automatically maintains undriven or floating inputs at valid logic states. TI explicitly advises against using external pullup or pulldown resistors with bus-hold enabled. This feature reduces BOM cost, saves PCB area, and eliminates resistor-induced timing skew-key advantages confirmed in the SN74AVCH1T45 datasheet Section 4.
What happens to the outputs of the SN74AVCH1T45 when one supply rail is powered down?
When either VCCA or VCCB is at GND while the other remains powered, the SN74AVCH1T45 activates VCC isolation: all outputs (A and B) enter high-impedance state. This prevents back-current flow and potential latch-up during asymmetric power sequencing-a critical reliability feature absent in basic level shifters. The bus-hold circuitry on the powered-up side remains active, preserving signal integrity on that rail. This behavior is guaranteed for the SN74AVCH1T45 across its full operating temperature range.
What is the maximum data rate supported by the SN74AVCH1T45, and under what conditions is it achieved?
The SN74AVCH1T45 achieves a maximum data rate of 500Mbps when translating from 1.8V to 3.3V (VCCA = 1.8V, VCCB = 3.3V), as specified in the official datasheet. Lower rates apply for other rail combinations: 320Mbps (<1.8V→3.3V), 280Mbps (→1.5V), and 240Mbps (→1.2V). These values reflect guaranteed AC performance under recommended operating conditions-not theoretical limits-and are validated across –40°C to 85°C ambient temperature for the SN74AVCH1T45.
SN74AVCH1T45DBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVCH
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Translator Type:
- Voltage Level
- Channel Type:
- Bidirectional
- Number of Circuits:
- 1
- Channels per Circuit:
- 1
- 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:
- SOT-23-6
SN74AVCH1T45DBVR FAQ
1.How can I place an order for SN74AVCH1T45DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVCH1T45DBVR 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 SN74AVCH1T45DBVR reliable?
The price and inventory of SN74AVCH1T45DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVCH1T45DBVR is usually 5 days.
3.What payment methods are accepted for SN74AVCH1T45DBVR?
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4.How is shipping managed for SN74AVCH1T45DBVR?
SN74AVCH1T45DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AVCH1T45DBVR 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 SN74AVCH1T45DBVR?
For technical support, including SN74AVCH1T45DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVCH1T45DBVR requirements.
6.How does Aetrix verify that SN74AVCH1T45DBVR is sourced from the original manufacturer or authorized distributors?
All SN74AVCH1T45DBVR 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 SN74AVCH1T45DBVR meets industry standards.
7.What is the process for return or replacement of SN74AVCH1T45DBVR?
All SN74AVCH1T45DBVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVCH1T45DBVR, 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 SN74AVCH1T45DBVR part is unused and in its original packaging.
Return procedure for SN74AVCH1T45DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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