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Texas Instruments SN74LV245APWR
- Part No.:
- SN74LV245APWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LV245APWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,670
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Product details
Overview
SN74LV245APWR 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 LED displays and network switch backplanes where level-shifting and bus contention control are critical.
For engineers reviewing the SN74LV245APWR datasheet, SN74LV245APWR pinout, SN74LV245APWR application, or SN74LV245APWR equivalent, key selection criteria include its 20-pin TSSOP package, 35 mA per-output drive capability, ±1 µA input leakage, 5.5 V tolerant inputs, and guaranteed 3-state isolation under power sequencing conditions.
Technical Context
The SN74LV245APWR implements a dual-bus directional interface controlled by DIR and OE pins: DIR selects A→B or B→A data flow, while OE enables/disables all outputs into high-impedance state. Its CMOS design includes Ioff circuitry that disables outputs during power-down, preventing backflow current when VCC = 0 V.
It supports true mixed-voltage operation - inputs tolerate up to 5.5 V regardless of VCC (2–5.5 V), enabling robust down-translation (e.g., 5 V logic driving 3.3 V bus). Output ground bounce (VOLP) and undershoot (VOHV) are characterized at 0.8 V and >2.3 V respectively under 3.3 V operation, confirming signal integrity in noise-sensitive systems.
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-10 ns timing margin for 50 MHz bus handshaking in telecom infrastructure. |
| Ioff Leakage | ≤5 µA at VCC = 0 V - guarantees safe isolation during hot-swap or partial-power-down sequences in server backplanes. |
| Input Voltage Tolerance | Up to 5.5 V on all I/O pins - allows direct connection of 5 V signals to 3.3 V system buses without clamping diodes. |
| Output Drive | ±35 mA per pin - sufficient to drive 50 Ω transmission lines or multiple CMOS loads in LED display column drivers. |
| ESD Rating | 2000 V HBM - meets industrial-grade handling requirements for automated PCB assembly and field-replaceable modules. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive gateways and industrial motor driver control boards. |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 0.65 mm pitch, exposed pad optional (not electrically connected in this variant), RoHS-compliant NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | High = A→B data flow; Low = B→A; determines bus arbitration direction in full-duplex interfaces. |
| A1–A8 (Pins 2–9) | Port A I/O terminals | Bidirectional data lines tied to local microcontroller or FPGA bus; tolerate 5.5 V regardless of VCC. |
| GND (Pin 10) | Ground reference | Primary return path for all I/O and supply currents; must be low-inductance connection to minimize ground bounce. |
| B1–B8 (Pins 11–18) | Port B I/O terminals | Bidirectional data lines connected to peripheral bus (e.g., LED driver ICs); share same voltage tolerance as Port A. |
| OE (Pin 19) | Output enable input | Active-low; drives all A/B outputs to high-Z when high - essential for bus sharing and hot-plug isolation. |
| VCC (Pin 20) | Power supply | Single supply for both ports; bypassing with 0.1 µF ceramic capacitor near pin required for stable switching. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage translation | Accepts 5.5 V inputs at any VCC (2–5.5 V), enabling reliable 5 V → 3.3 V down-translation without external components. |
| Ioff partial-power-down protection | Blocks reverse current flow when VCC = 0 V, allowing safe insertion/removal in live backplanes and modular servers. |
| Controlled output edge rates | Slow slew minimizes ringing and EMI on long traces - critical for LED display column drivers with capacitive loads. |
| 3-state bus isolation | OE-controlled high-Z outputs prevent bus contention in multi-master systems like network switch fabric controllers. |
| Low dynamic ground bounce | VOLP < 0.8 V at 3.3 V - maintains noise margin in dense PCB layouts with shared ground planes. |
Applications
| LED Display Backplane Interface | Network Switch Fabric Controller |
|---|---|
|
Use Scenario: Driving 16-segment LED columns in outdoor signage with 3.3 V MCU and 5 V LED drivers. IC Role / Device Role / Timing Role: Bidirectional level translator and bus isolator between MCU GPIO and LED sink drivers. Use Value: Eliminates discrete level-shifter ICs; 5.5 V-tolerant inputs accept LED driver feedback signals directly. |
Use Scenario: Interfacing multiple ASICs on a 10 GbE switch line card with mismatched I/O voltages. IC Role / Device Role / Timing Role: Direction-controlled data bridge between 2.5 V packet parser and 3.3 V MAC controller. Use Value: 6.5 ns tpd ensures setup/hold compliance at 100 MHz bus clock; Ioff prevents power-rail coupling during ASIC reset. |
| Industrial Motor Driver I/O Expander | Server Baseboard Management Controller (BMC) |
|
Use Scenario: Extending GPIO count of ARM-based motion controller to manage 8-axis stepper driver enable lines. IC Role / Device Role / Timing Role: Octal buffer with direction control for synchronized enable/disable of motor phases. Use Value: ±35 mA drive per output directly switches optocoupler inputs; 125°C rating supports enclosed cabinet environments. |
Use Scenario: Isolating sensor bus (I²C/SMBus) between 1.8 V BMC SoC and 3.3 V thermal/power monitoring ICs. IC Role / Device Role / Timing Role: 3-state bus transceiver enabling shared sensor access without address conflicts. Use Value: OE pin allows BMC to release bus during firmware updates; 2000 V HBM withstands chassis ESD 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 |
|---|---|---|---|
| SN74LVC245APW | Lower VCC range (1.65–3.6 V); no 5.5 V input tolerance; 5.3 ns tpd at 3.3 V. | Restricted to single-supply 3.3 V systems; unsuitable for mixed-voltage 5 V ↔ 3.3 V interfaces. | Select only when full 2–5.5 V operation and 5.5 V input tolerance are unnecessary. |
| 74AVCH245PW | Supports 0.8–3.6 V VCC; higher speed (3.2 ns tpd); auto-direction sensing (no DIR pin). | Requires redesign of control logic; lacks Ioff and 5.5 V input tolerance - not drop-in compatible. | Choose for ultra-low-voltage portable designs where DIR pin elimination simplifies routing, but verify Ioff absence is acceptable. |
Compared with SN74LVC245APW and 74AVCH245PW, the SN74LV245APWR uniquely combines wide VCC range, 5.5 V input tolerance, and Ioff - making it the only option among the three qualified for hot-swappable 5 V/3.3 V mixed-domain backplanes in telecom and industrial equipment.
Availability
SN74LV245APWR is available at Aetrix Electronics and suitable for LED displays, network switches, and motor drivers requiring stable component supply across extended temperature ranges and mixed-voltage board designs.
Supply support for SN74LV245APWR 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 solutions with over 50 years of innovation in industrial, automotive, and communications markets.
The SN74LV245A family was engineered for robust bidirectional bus interfacing in harsh environments - emphasizing voltage flexibility, power-down safety, and signal integrity in infrastructure equipment.
FAQ
What is the maximum operating voltage on the I/O pins of the SN74LV245APWR?
The SN74LV245APWR supports up to 5.5 V on all A- and B-port I/O pins regardless of VCC setting - a key feature enabling direct interfacing between 5 V peripherals and lower-voltage controllers without external clamping or level-shifting circuitry. This specification is explicitly guaranteed in the Absolute Maximum Ratings table and confirmed across all recommended VCC ranges (2 V to 5.5 V).
Does the SN74LV245APWR support partial-power-down operation?
Yes, the SN74LV245APWR includes Ioff circuitry that actively disables outputs when VCC = 0 V, limiting Ioff leakage to ≤5 µA. This prevents damaging current backflow in systems where one side of the bus remains powered while the other is de-energized - a requirement verified in JESD78 latch-up testing and explicitly documented in the Feature Description section of the datasheet.
What is the propagation delay of the SN74LV245APWR at 3.3 V supply?
At VCC = 3.3 V ± 0.3 V and CL = 15 pF, the SN74LV245APWR exhibits a typical propagation delay (tpd) of 5.9 ns and a maximum of 11 ns over –40°C to +125°C. This value is measured from DIR or data input to opposite-port output and is validated per Figure 6-1 and Table 6.7 in the official TI datasheet SCLS382R.
Can the SN74LV245APWR be used for unidirectional data transfer?
Yes, the SN74LV245APWR can operate unidirectionally by holding DIR at a fixed logic level (high for A→B, low for B→A) while using OE to enable/disable the path. Its functional table confirms deterministic behavior in both directions, and the device is routinely applied this way in I/O expander and bus isolation roles where bidirectional capability is retained but only one direction is active per configuration.
Is the SN74LV245APWR pin-compatible with other packages in the SN74LV245A family?
No - the SN74LV245APWR uses the TSSOP-20 (PW) package with 6.50 mm × 4.40 mm dimensions and 0.65 mm pitch, which differs mechanically from SSOP (DB), VSSOP (DGS), or VQFN (RGY/RKS) variants. While all share identical pin functions and numbering, PCB layout must be redesigned for each package due to distinct land patterns, thermal pad requirements, and reflow profiles.
SN74LV245APWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-TSSOP (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:
- 16mA, 16mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74LV245APWR FAQ
1.How can I place an order for SN74LV245APWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV245APWR 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 SN74LV245APWR reliable?
The price and inventory of SN74LV245APWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV245APWR is usually 5 days.
3.What payment methods are accepted for SN74LV245APWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV245APWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV245APWR?
SN74LV245APWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV245APWR 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 SN74LV245APWR?
For technical support, including SN74LV245APWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV245APWR requirements.
6.How does Aetrix verify that SN74LV245APWR is sourced from the original manufacturer or authorized distributors?
All SN74LV245APWR 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 SN74LV245APWR meets industry standards.
7.What is the process for return or replacement of SN74LV245APWR?
All SN74LV245APWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV245APWR, 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 SN74LV245APWR part is unused and in its original packaging.
Return procedure for SN74LV245APWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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