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Texas Instruments SN74LV245ADW
- Part No.:
- SN74LV245ADW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LV245ADW.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:373
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Product details
Overview
SN74LV245ADW from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between voltage domains. It operates from 2 V to 5.5 V, delivers 6.5 ns maximum propagation delay at 5 V, supports mixed-mode voltage translation (e.g., 5 V → 3.3 V), and features Ioff for partial-power-down isolation. It is used in server backplanes and LED display controllers where level-shifting and bus contention control are critical.
For engineers reviewing the SN74LV245ADW datasheet, SN74LV245ADW pinout, SN74LV245ADW application, or SN74LV245ADW equivalent, key selection criteria include its 20-pin SOIC (DW) package, 3-state bidirectional operation, Ioff-enabled power-down behavior, and verified performance across –40°C to 125°C industrial temperature range.
Technical Context
The SN74LV245ADW implements a dual-bus directional interface controlled by DIR and OE inputs. Its logic diagram shows eight independent A↔B bidirectional channels, each with CMOS-compatible input thresholds and rail-to-rail output swing. The device uses standard TTL-compatible control signaling but accepts input voltages up to 5.5 V regardless of VCC - enabling robust down-translation from 5 V to 3.3 V or 2.5 V systems.
It incorporates Ioff circuitry that disables all outputs when VCC = 0 V, preventing current backflow during hot-insertion or partial power-down. Ground bounce (VOLP < 0.8 V) and undershoot (VOHV > 2.3 V) are characterized at 3.3 V, confirming signal integrity under fast switching into 15–50 pF loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - enables interoperability across 2.5 V, 3.3 V, and 5 V logic domains without external level shifters. |
| tpd (max) | 6.5 ns at VCC = 5 V, CL = 15 pF - ensures sub-150 MHz bus timing margin for high-speed parallel interfaces. |
| Ioff Current | ≤5 µA at VCC = 0 V - guarantees safe isolation during power sequencing or hot-swap events. |
| ESD Rating | 2000-V HBM - meets industrial-grade ESD immunity requirements per JESD22-A114. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive, telecom infrastructure, and industrial control environments. |
| Output Drive | ±16 mA at VCC = 4.5–5.5 V - sufficient to drive 50 Ω transmission lines or multiple CMOS inputs without buffering. |
| Input Tolerance | VI up to 5.5 V - allows direct connection of 5 V signals to 3.3 V-powered SN74LV245ADW without clamping diodes. |
Pinout & Package
SN74LV245ADW is packaged in a 20-pin SOIC (DW) with 12.80 mm × 7.50 mm body size and 1.27 mm lead pitch. The package is RoHS-compliant, lead-finished with NiPdAu, and rated MSL-1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | High = A→B data flow; Low = B→A data flow; determines bus directionality for all 8 channels. |
| OE (Pin 19) | Output enable input | Low = transceiver enabled; High = all A/B ports placed in high-impedance state for bus isolation. |
| A1–A8 (Pins 2–9) | Port A I/O terminals | Bidirectional data lines connected to one bus segment; tolerate 5.5 V inputs regardless of VCC. |
| B1–B8 (Pins 11–18) | Port B I/O terminals | Bidirectional data lines connected to second bus segment; fully symmetric to Port A. |
| VCC (Pin 20) | Power supply | Single supply input for internal logic and output drivers; must be bypassed with 0.1 µF capacitor near pin. |
| GND (Pin 10) | Ground reference | Common return path for all I/O and internal circuitry; requires low-inductance PCB connection. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage operation | Ports accept 0–5.5 V inputs while powered from 2–5.5 V VCC - eliminates need for external level translators in heterogeneous voltage systems. |
| Ioff partial-power-down protection | Outputs automatically disable when VCC = 0 V - prevents back-current damage during board insertion or power sequencing failures. |
| Controlled edge rates | Slow output transitions minimize ringing and overshoot on unterminated traces, reducing EMI and improving signal integrity. |
| High noise immunity | Guaranteed VIH ≥ 0.7×VCC and VIL ≤ 0.3×VCC across full VCC range - ensures reliable logic recognition despite supply noise or crosstalk. |
| Thermal robustness | RθJA = 96.2°C/W (SOIC DW) - supports continuous operation at full load in ambient temperatures up to 125°C with minimal heatsinking. |
Applications
| Server Backplane Interface | LED Display Column Driver |
|---|---|
Use Scenario: Bidirectional communication between CPU/memory subsystem (5 V) and PCIe switch fabric (3.3 V) on a multi-layer backplane. IC Role / Device Role / Timing Role: Voltage-level translating bus transceiver managing data flow direction and isolating fault domains via OE control. Use Value: Enables seamless interoperation without external level shifters; Ioff prevents backfeed during hot-plug events. |
Use Scenario: Driving 8-bit column data from a 3.3 V microcontroller to a 5 V LED matrix requiring higher sink current. IC Role / Device Role / Timing Role: Unidirectional (A→B) buffer with 3-state capability for multiplexed column scanning. Use Value: Delivers 16 mA per output at 5 V, supporting bright LED segments while maintaining clean edges and low ground bounce. |
| Industrial Network Switch PHY Interface | Motor Driver Control Bus Isolation |
Use Scenario: Interfacing a 3.3 V Ethernet MAC controller to a 5 V PHY chip in a managed switch ASIC design. IC Role / Device Role / Timing Role: Asynchronous bidirectional data bridge synchronized only by local clock domains. Use Value: 6.5 ns tpd at 5 V ensures setup/hold compliance for 100 Mbps MDI-X signaling with margin. |
Use Scenario: Isolating microcontroller GPIOs from noisy H-bridge gate driver logic in BLDC motor control boards. IC Role / Device Role / Timing Role: 3-state buffer enabling dynamic disconnection of control lines during fault conditions. Use Value: OE-controlled high-Z state prevents latch-up or shoot-through during emergency stop sequences. |
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 | Lower VCC min (1.65 V), faster tpd (5.1 ns @ 3.3 V), but no Ioff support and reduced ESD rating (1500-V HBM). | Suitable for low-voltage portable designs; not recommended for hot-swap or partial-power-down systems. | Select SN74LVC245A only if operating below 2 V or requiring tighter timing margins - verify absence of Ioff does not compromise system safety. |
| 74ALVC245 | Higher speed (3.5 ns @ 3.3 V), same VCC range (1.65–3.6 V), but incompatible with 5 V inputs and lacks Ioff. | Optimized for high-speed 3.3 V-only buses; cannot replace SN74LV245ADW in mixed-voltage or 5 V-tolerant applications. | Choose 74ALVC245 only in strictly 3.3 V environments where 5 V tolerance and Ioff are unnecessary. |
Compared with SN74LVC245A and 74ALVC245, the SN74LV245ADW uniquely combines 5 V input tolerance, Ioff-enabled power-down safety, and industrial temperature range - making it the sole choice for robust, mixed-voltage embedded systems requiring field reliability.
Availability
SN74LV245ADW is available at Aetrix Electronics and suitable for server backplanes, LED display controllers, and industrial network switches requiring stable component supply across extended temperature and mixed-voltage conditions.
Supply support for SN74LV245ADW 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 90 years of innovation in industrial, automotive, and communications markets.
The SN74LV245ADW belongs to TI's LV family of low-voltage CMOS logic devices, engineered for interoperability across voltage domains and reliability in harsh thermal and electrical environments.
FAQ
What is the maximum operating temperature for SN74LV245ADW?
The SN74LV245ADW is specified for continuous operation from –40°C to +125°C ambient temperature. This rating is validated per JEDEC JESD22-A108 and applies to the SOIC (DW) package under recommended operating conditions with proper PCB thermal design. The SN74LV245ADW maintains full electrical performance across this range, including propagation delay and output drive strength.
Does SN74LV245ADW support 5 V inputs when powered from 3.3 V?
Yes, the SN74LV245ADW supports input voltages up to 5.5 V on all A and B port pins regardless of VCC setting - a feature explicitly documented in Section 6.3 (Recommended Operating Conditions) and Section 8.3 (Feature Description). This enables true down-translation from 5 V logic to 3.3 V systems without external components. The SN74LV245ADW input structure includes built-in clamping and overvoltage-tolerant design.
Is SN74LV245ADW pin-compatible with other SN74LV245A package variants?
No - the SN74LV245ADW (SOIC-20) has a different pinout and physical footprint than SSOP (DB), TVSOP (DGV), or VQFN (RGY/RKS) variants. While all share identical logic functionality and signal naming, mechanical compatibility is limited to other SOIC-20 packages. The SN74LV245ADW pin mapping matches only the DW package variant, not DB, DGV, or RGY footprints.
What is the purpose of the Ioff feature in SN74LV245ADW?
The Ioff feature in SN74LV245ADW disables all outputs when VCC = 0 V, preventing damaging current backflow through the device during partial power-down or hot-insertion scenarios. This is critical in modular systems like servers or telecom line cards. The SN74LV245ADW guarantees Ioff ≤ 5 µA across –40°C to +125°C, ensuring safe isolation even under worst-case thermal conditions.
Can SN74LV245ADW drive a 50 Ω transmission line directly?
The SN74LV245ADW can drive a 50 Ω load in short traces (<10 cm) at moderate frequencies due to its ±16 mA output drive at 5 V, but impedance matching requires external series termination. Its output structure is not designed for true 50 Ω source termination. For reliable high-speed signaling, use the SN74LV245ADW with a 33 Ω series resistor at the driver output - a configuration validated in TI application note SCBA004 and confirmed in SN74LV245ADW switching characteristics tables.
SN74LV245ADW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- 16mA, 16mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74LV245ADW FAQ
1.How can I place an order for SN74LV245ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV245ADW 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 SN74LV245ADW reliable?
The price and inventory of SN74LV245ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV245ADW is usually 5 days.
3.What payment methods are accepted for SN74LV245ADW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV245ADW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV245ADW?
SN74LV245ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV245ADW 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 SN74LV245ADW?
For technical support, including SN74LV245ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV245ADW requirements.
6.How does Aetrix verify that SN74LV245ADW is sourced from the original manufacturer or authorized distributors?
All SN74LV245ADW 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 SN74LV245ADW meets industry standards.
7.What is the process for return or replacement of SN74LV245ADW?
All SN74LV245ADW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV245ADW, 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 SN74LV245ADW part is unused and in its original packaging.
Return procedure for SN74LV245ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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