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Texas Instruments SN74LVCH245ADWR
- Part No.:
- SN74LVCH245ADWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVCH245ADWR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,953
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Product details
Overview
SN74LVCH245ADWR 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. It supports mixed-mode operation (5-V-tolerant inputs with 3.3-V VCC), features Ioff for live insertion, bus-hold on all data inputs, and delivers 6.3 ns max propagation delay at 3.3 V. It is used in server backplanes and PC motherboard I/O expansion interfaces.
For engineers reviewing the SN74LVCH245ADWR datasheet, SN74LVCH245ADWR pinout, SN74LVCH245ADWR application, or SN74LVCH245ADWR 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), Ioff-enabled partial-power-down support, bus-hold elimination of external resistors, and SOIC-20 package compatibility with legacy PCB layouts.
Technical Context
This device implements a dual-bus, direction-controlled transceiver architecture with independent DIR and OE inputs: DIR selects data flow direction (A→B or B→A), while OE enables/disables all outputs into high-impedance state. The internal bus-hold circuitry latches floating inputs to valid logic levels without external components and remains active regardless of OE or DIR state.
It integrates Ioff protection that disables outputs when VCC = 0 V, preventing back-drive current during hot-insertion or partial power-down. Input clamping diodes and JESD22-compliant ESD protection (2000-V HBM, 1500-V CDM) ensure robustness in industrial and computing environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - Enables operation across low-voltage embedded systems and standard 3.3-V logic rails. |
| Input Voltage Tolerance | Up to 5.5 V - Allows direct interfacing with 5-V legacy peripherals without level-shifting circuitry. |
| Max Propagation Delay | 6.3 ns at 3.3 V - Supports high-speed data transfer in DDR memory buffers and PCIe auxiliary buses. |
| Ioff Leakage | ±20 µA at 0 V VCC - Guarantees safe live insertion and prevents back-current damage during power sequencing. |
| Bus-Hold Current | ±75 µA at 3 V - Maintains stable logic states on un-driven A/B port lines, eliminating need for pull-up/pull-down resistors. |
| ESD Rating (HBM) | 2000 V - Meets JEDEC JS-001 for handling safety in automated assembly and field-replaceable module integration. |
| Operating Temperature | –40°C to +125°C - Qualified for under-hood automotive ECUs and industrial control PLC backplanes. |
Pinout & Package
SN74LVCH245ADWR is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package measuring 12.80 mm × 7.50 mm, compatible with standard surface-mount reflow profiles and legacy through-hole footprint adapters.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | High = A→B data flow; Low = B→A - Enables dynamic bus arbitration in shared-memory architectures. |
| 19 (OE) | Output Enable Input (active low) | Low = outputs enabled; High = all A/B ports enter high-Z - Provides hardware-based bus isolation for multi-master systems. |
| 2–9 (A1–A8) | Bidirectional Data Port A | Connects to local controller or microprocessor bus - Bus-hold maintains last valid state if disconnected. |
| 11–18 (B1–B8) | Bidirectional Data Port B | Interfaces with peripheral or memory bus - 5.5-V tolerant inputs accept 5-V signals even at 1.65-V VCC. |
| 10 (GND) | Ground Reference | Primary return path for all I/O and supply currents - Requires low-inductance connection to minimize ground bounce (VOLP <0.8 V). |
| 20 (VCC) | Positive Supply | Single power rail powers all logic and I/O - Ioff ensures zero current flow when VCC = 0 V during hot-swap events. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-voltage translation | 5-V-tolerant inputs operate reliably with 1.65–3.6-V VCC - Eliminates discrete level shifters in hybrid 3.3/5-V systems like industrial HMIs. |
| Integrated bus-hold | Active on all A/B port inputs without external components - Reduces BOM count and PCB area in space-constrained IoT gateways. |
| Ioff partial-power-down | Outputs disabled and leakage limited to ±20 µA when VCC = 0 V - Enables safe hot-plug of mezzanine cards in telecom line cards. |
| Tri-state output control | Independent OE and DIR pins allow concurrent bus isolation and direction switching - Critical for DMA coherency in real-time embedded controllers. |
| Robust ESD immunity | 2000-V HBM and 1500-V CDM ratings - Ensures reliability in handheld medical devices exposed to frequent human contact. |
Applications
| Server Backplane Interconnect | PC Motherboard I/O Expansion |
|---|---|
Use Scenario: Bidirectional data routing between CPU-attached PCIe switch and SATA/NVMe storage controllers on a multi-layer backplane. IC Role / Device Role / Timing Role: Level-translating bus transceiver managing signal integrity across mixed-voltage domains (1.8-V GPU link, 3.3-V storage PHY). Use Value: 6.3 ns tpd ensures sub-cycle latency for cache-coherent interconnects; Ioff prevents back-drive during hot-swap of storage modules. |
Use Scenario: Isolating legacy LPC bus from modern 3.3-V Super I/O controller while supporting 5-V firmware flash access. IC Role / Device Role / Timing Role: Direction-controlled buffer enabling firmware update mode (B→A) and runtime I/O (A→B) without software intervention. Use Value: Bus-hold eliminates pull-ups on LPC reset and clock lines; 5.5-V input tolerance allows direct connection to 5-V BIOS ROM. |
| Industrial PLC Communication Module | Wearable Health Sensor Hub |
Use Scenario: Interfacing 24-V fieldbus transceivers (via level-shifted logic) to 3.3-V ARM Cortex-M7 MCU in modular I/O chassis. IC Role / Device Role / Timing Role: Voltage-translating isolator between isolated RS-485 PHY and non-isolated processor domain. Use Value: –40°C to +125°C rating supports extended temperature operation; Ioff protects MCU during fieldbus power cycling. |
Use Scenario: Aggregating analog sensor data (ECG, SpO₂) from multiple 1.8-V ADCs to a 3.3-V Bluetooth SoC in ultra-low-power wearable patch. IC Role / Device Role / Timing Role: Low-leakage bus interface enabling <1 µA sleep current when OE is asserted and VCC = 1.8 V. Use Value: ±20 µA Ioff leakage extends battery life; bus-hold prevents spurious wakeups from floating sensor bus lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245A | No bus-hold; 1.65–3.6-V VCC; 5-V tolerant inputs; 6.7 ns tpd at 3.3 V. | Lacks integrated bus-hold - requires external pull-up/down resistors on unused lines. | Choose when cost sensitivity outweighs BOM simplification and board space constraints. |
| 74ALVC245 | 1.65–3.6-V VCC; no Ioff; no bus-hold; 5-V tolerant; 5.5 ns tpd at 3.3 V. | Not qualified for partial-power-down use - unsuitable for hot-pluggable modules. | Select only for fixed-installation systems where power sequencing is fully controlled and bus-hold is externally managed. |
Compared with SN74LVCH245ADWR, SN74LVC245A reduces cost but increases design complexity via external biasing, while 74ALVC245 offers faster timing but sacrifices Ioff and bus-hold-making SN74LVCH245ADWR optimal for thermally constrained, hot-swap-capable, and space-limited designs.
Availability
SN74LVCH245ADWR is available at Aetrix Electronics and suitable for server backplanes, PC motherboard I/O expansion, and industrial PLC communication modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVCH245ADWR 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 over 50 years of innovation in high-reliability logic and interface solutions.
The SN74LVCH245A product line targets mixed-voltage system integration in computing, industrial automation, and communications infrastructure-designed specifically to simplify voltage translation, reduce external component count, and enhance robustness in thermally demanding environments.
FAQ
What is the maximum input voltage rating for SN74LVCH245ADWR?
The SN74LVCH245ADWR supports input voltages up to 5.5 V across all A and B port pins, regardless of VCC level (1.65–3.6 V). This allows direct interfacing with 5-V logic families without external level shifters. Absolute maximum input voltage is specified as –0.5 V to 6.5 V, but sustained operation above 5.5 V risks permanent damage per the Absolute Maximum Ratings table.
Does SN74LVCH245ADWR support hot-plug operation?
Yes, SN74LVCH245ADWR supports hot-plug operation via its Ioff feature: when VCC = 0 V, input and output leakage is limited to ±20 µA, preventing damaging back-current flow during insertion or removal. To ensure reliable high-impedance state during power-up, OE must be tied to VCC through a pullup resistor sized per the driver's sink capability.
How does bus-hold functionality work on SN74LVCH245ADWR?
SN74LVCH245ADWR integrates active bus-hold circuitry on all A1–A8 and B1–B8 inputs, maintaining the last valid logic state without external resistors. It draws ±75 µA at 3 V to latch floating lines-functioning independently of OE or DIR status. Using external pull-up/down resistors with bus-hold is not recommended, as it creates conflicting drive conditions.
What is the propagation delay of SN74LVCH245ADWR at 1.8 V VCC?
At VCC = 1.8 V ± 0.15 V and TA = –40°C to +85°C, the maximum propagation delay (tpd) of SN74LVCH245ADWR is 12.7 ns. This value is measured from input (A or B) to corresponding output (B or A) under loaded conditions and reflects worst-case timing for low-voltage operation in battery-powered edge devices.
Is SN74LVCH245ADWR pin-compatible with SN74LVC245A?
Yes, SN74LVCH245ADWR and SN74LVC245A share identical 20-pin SOIC (DW) packaging and pinout-including DIR (pin 1), OE (pin 19), A1–A8 (pins 2–9), B1–B8 (pins 11–18), GND (pin 10), and VCC (pin 20). However, SN74LVCH245ADWR adds bus-hold and enhanced Ioff, making it a functional upgrade-not just a drop-in replacement-in designs requiring those features.
SN74LVCH245ADWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCH
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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-SOIC
SN74LVCH245ADWR FAQ
1.How can I place an order for SN74LVCH245ADWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCH245ADWR 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 SN74LVCH245ADWR reliable?
The price and inventory of SN74LVCH245ADWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCH245ADWR is usually 5 days.
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4.How is shipping managed for SN74LVCH245ADWR?
SN74LVCH245ADWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVCH245ADWR 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 SN74LVCH245ADWR?
For technical support, including SN74LVCH245ADWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCH245ADWR requirements.
6.How does Aetrix verify that SN74LVCH245ADWR is sourced from the original manufacturer or authorized distributors?
All SN74LVCH245ADWR 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 SN74LVCH245ADWR meets industry standards.
7.What is the process for return or replacement of SN74LVCH245ADWR?
All SN74LVCH245ADWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCH245ADWR, 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 SN74LVCH245ADWR part is unused and in its original packaging.
Return procedure for SN74LVCH245ADWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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