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Texas Instruments SN74LVCH245ADGVR
- Part No.:
- SN74LVCH245ADGVR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVCH245ADGVR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,921
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Product details
Overview
SN74LVCH245ADGVR from Texas Instruments is an octal bus transceiver with tri-state outputs, designed for bidirectional data translation between 1.65-V and 3.6-V logic domains while accepting 5-V-tolerant inputs. It features 20-pin TVSOP packaging, 6.3 ns max propagation delay at 3.3 V, Ioff support for live insertion, and integrated bus-hold on all data inputs-enabling use in mixed-voltage server backplanes and industrial I/O modules.
For engineers reviewing the SN74LVCH245ADGVR datasheet, SN74LVCH245ADGVR pinout, SN74LVCH245ADGVR application, or SN74LVCH245ADGVR equivalent, key selection criteria include voltage translation capability (1.65–3.6 V VCC with 5.5 V input tolerance), tri-state control timing (8.5 ns disable time at 3.3 V), thermal performance (114.7 °C/W RθJA in TVSOP), bus-hold functionality eliminating external resistors, and Ioff protection for partial-power-down systems.
Technical Context
This device implements a dual-bus, direction-controlled transceiver architecture with independent DIR and OE controls: DIR selects data flow direction (A→B or B→A), while OE enables/disables all outputs into high-impedance state. Its CMOS input structure supports 5.5 V tolerant inputs regardless of VCC level, enabling interoperability across 3.3 V and 5 V subsystems without level-shifting components.
The SN74LVCH245ADGVR integrates bus-hold circuitry on all A and B port inputs-maintaining valid logic states on floating lines without external pullups-and employs Ioff protection to block current flow when VCC = 0 V, preventing back-drive damage during hot-swap or power sequencing events in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports low-voltage operation down to 1.65 V while maintaining full 5.5 V input tolerance |
| Max Propagation Delay | 6.3 ns at 3.3 V - enables high-speed data transfer in DDR memory interfaces and PCIe sideband buses |
| Input Voltage Tolerance | 0 V to 5.5 V - allows direct connection to legacy 5 V peripherals without external level shifters |
| Ioff Leakage | ±20 µA at 0 V VCC - prevents damaging back-current during partial power-down in modular systems |
| Bus-Hold Current | ±75 µA at 3 V - actively holds unused inputs at valid logic levels, eliminating need for external biasing resistors |
| Output Drive Strength | ±24 mA at 3 V - drives standard CMOS loads with fast edge rates and minimal signal degradation |
| ESD Rating (HBM) | 2000 V - meets industrial-grade robustness requirements for board-level handling and field deployment |
Pinout & Package
SN74LVCH245ADGVR uses a 20-pin Thin Very Small Outline Package (TVSOP) with 0.4 mm lead pitch and 5.00 mm × 4.40 mm body size, optimized for high-density PCB layouts in space-constrained applications such as network interface cards and embedded controllers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 DIR | Direction control input | High = A→B data flow; Low = B→A - determines real-time bidirectional path without reconfiguration overhead |
| 2–9, 11–18 A1–A8 / B1–B8 | Bidirectional data I/O ports | Octal parallel channels with bus-hold and 5.5 V tolerance - supports simultaneous 8-bit data translation |
| 10 GND | Ground reference | Primary return path for all I/O and supply currents; requires low-inductance connection to minimize ground bounce |
| 19 OE | Output enable (active-low) | Asserted low disables all outputs into high-Z - isolates buses during reset, sleep, or fault conditions |
| 20 VCC | Positive supply | Single 1.65–3.6 V rail powers entire transceiver; supports dynamic voltage scaling in energy-efficient designs |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | Enables direct interfacing between 3.3 V microcontrollers and 5 V sensors/actuators without discrete level shifters |
| Integrated bus-hold circuitry | Eliminates external pullup/pulldown resistors on all 16 data lines - reduces BOM count and layout area by up to 32 passives |
| Ioff partial-power-down support | Prevents current backflow when VCC = 0 V - essential for hot-plug expansion slots and modular power architectures |
| Low ground bounce (VOLP < 0.8 V) | Minimizes noise coupling into adjacent analog or RF sections during high-speed switching transitions |
| Latch-up immunity > 250 mA | Ensures robust operation under transient overvoltage or ESD stress in harsh industrial environments |
Applications
| Server Backplane Interfacing | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Bidirectional data exchange between 3.3 V CPU subsystem and 5 V legacy peripheral cards in rack-mounted servers. IC Role / Device Role / Timing Role: Octal transceiver providing voltage translation and bus isolation under DIR/OE control with sub-7 ns latency. Use Value: Enables drop-in compatibility with legacy 5 V add-in cards while operating from modern low-voltage rails - avoids redesign of power delivery and signal integrity layers. |
Use Scenario: Isolating field-side 5 V sensor/actuator signals from 3.3 V controller domain in programmable logic controllers. IC Role / Device Role / Timing Role: Direction-controlled bus translator with Ioff and bus-hold ensuring safe hot-swap and floating-input resilience. Use Value: Eliminates need for external level shifters and bias resistors - reduces component count and improves long-term reliability in dusty, vibration-prone environments. |
| Wearable Health Data Aggregation | Network Switch Management Interfaces |
Use Scenario: Consolidating biometric sensor data (5 V analog front-end) into a 1.8 V ultra-low-power MCU in compact wearable devices. IC Role / Device Role / Timing Role: Low-voltage transceiver with 1.65 V minimum VCC and 5.5 V input tolerance enabling mixed-supply integration. Use Value: Supports aggressive voltage scaling for battery life extension while preserving compatibility with higher-voltage sensor ICs - no additional power conversion required. |
Use Scenario: Interfacing 3.3 V baseboard management controllers (BMC) with 5 V fan/power-supply monitoring circuits in enterprise switches. IC Role / Device Role / Timing Role: Tri-state-enabled bus isolator allowing BMC to read/write status registers without contention on shared SMBus/I²C lines. Use Value: Provides electrical isolation and voltage translation on critical system management buses - prevents latch-up during firmware updates or thermal throttling events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | Lower drive strength (±24 mA → ±12 mA at 3.3 V); no bus-hold; 1.65–3.6 V VCC | Lacks bus-hold and has reduced noise margin - requires external pull resistors and careful signal integrity design | Choose when cost sensitivity outweighs need for bus-hold and higher drive; verify layout for signal integrity |
| SN74AVC245DGVR | Wider VCC range (1.2–3.6 V); lower propagation delay (3.2 ns); no Ioff; 5 V tolerance only at VCC ≥ 2.3 V | Supports 1.2 V core logic but loses Ioff protection and 5 V tolerance below 2.3 V - unsuitable for true hot-swap | Prefer for ultra-low-voltage SoC interfaces where Ioff is not required; avoid in mixed-rail hot-swap systems |
Compared with SN74LVC245APWR and SN74AVC245DGVR, the SN74LVCH245ADGVR uniquely combines Ioff, bus-hold, and full 5.5 V input tolerance across its entire 1.65–3.6 V operating range - making it the only option among the three qualified for live-insertion and floating-input industrial applications.
Availability
SN74LVCH245ADGVR is available at Aetrix Electronics and suitable for server backplanes, industrial PLC I/O modules, wearable health data aggregation, and network switch management interfaces requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SN74LVCH245ADGVR 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, with over 90 years of innovation in precision analog, power management, and logic devices.
The SN74LVCH245A product line delivers robust, voltage-flexible bus transceivers for mixed-signal system interfacing - specifically engineered for industrial automation, computing infrastructure, and communications equipment requiring reliable level translation and power sequencing resilience.
FAQ
What is the minimum supply voltage for reliable operation of the SN74LVCH245ADGVR?
The SN74LVCH245ADGVR operates reliably from 1.65 V to 3.6 V VCC. At 1.65 V, it maintains full 5.5 V input tolerance and specified timing (max tpd = 12.7 ns). Below 1.65 V, functionality is not guaranteed per TI's SCES008Q datasheet - data retention is supported down to 1.5 V, but active logic operation requires ≥1.65 V.
Does the SN74LVCH245ADGVR support hot-plug insertion while powered down?
Yes. The SN74LVCH245ADGVR includes Ioff circuitry that disables outputs and limits leakage to ±20 µA when VCC = 0 V, preventing damaging back-current from live backplane traces. This feature is explicitly validated in TI's datasheet Section 8.1 and enables safe hot-swap in modular server and telecom chassis.
How does bus-hold functionality work on the SN74LVCH245ADGVR, and can it be disabled?
Bus-hold on the SN74LVCH245ADGVR is implemented as weak feedback latches on all A and B port inputs, actively holding floating pins at their last valid logic state. It cannot be disabled via OE or DIR - it remains active even in tri-state mode. TI advises against using external pull resistors with bus-hold, as they conflict and degrade noise margins.
What is the maximum data rate supported by the SN74LVCH245ADGVR in a typical application?
The SN74LVCH245ADGVR supports data rates up to ~80 Mbps in point-to-point configurations, derived from its 6.3 ns max propagation delay at 3.3 V and 1 ns output skew. Real-world throughput depends on load capacitance, trace impedance, and noise margin - TI recommends limiting CL to ≤50 pF and using controlled-impedance routing for >50 Mbps operation.
Is the SN74LVCH245ADGVR pin-compatible with other packages in the same family?
No. While SN74LVCH245ADGVR (TVSOP-20) shares identical logic functionality and pin numbering with SN74LVCH245ADBR (SSOP-20) and SN74LVCH245APWR (TSSOP-20), mechanical dimensions, thermal characteristics (RθJA = 114.7 °C/W vs. 102.5 °C/W), and solder profile requirements differ. PCB layout must be package-specific - no direct footprint interchangeability.
SN74LVCH245ADGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCH
- Package/Case:
- 20-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TVSOP
SN74LVCH245ADGVR FAQ
1.How can I place an order for SN74LVCH245ADGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCH245ADGVR 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 SN74LVCH245ADGVR reliable?
The price and inventory of SN74LVCH245ADGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCH245ADGVR is usually 5 days.
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SN74LVCH245ADGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVCH245ADGVR 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 SN74LVCH245ADGVR?
For technical support, including SN74LVCH245ADGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCH245ADGVR requirements.
6.How does Aetrix verify that SN74LVCH245ADGVR is sourced from the original manufacturer or authorized distributors?
All SN74LVCH245ADGVR 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 SN74LVCH245ADGVR meets industry standards.
7.What is the process for return or replacement of SN74LVCH245ADGVR?
All SN74LVCH245ADGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCH245ADGVR, 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 SN74LVCH245ADGVR part is unused and in its original packaging.
Return procedure for SN74LVCH245ADGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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