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Texas Instruments SN74LV245ANSR
- Part No.:
- SN74LV245ANSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LV245ANSR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,389
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Product details
Overview
SN74LV245ANSR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between voltage-divergent buses (e.g., 5 V ↔ 3.3 V). It operates from 2 V to 5.5 V, delivers ≤6.5 ns propagation delay at 5 V, supports Ioff partial-power-down mode, and features ±35 mA output drive per pin - used in server backplanes and LED display controllers.
For engineers reviewing the SN74LV245ANSR datasheet, SN74LV245ANSR pinout, SN74LV245ANSR application, or SN74LV245ANSR equivalent, key selection criteria include mixed-mode voltage tolerance, 3-state isolation timing (ten/tdis), ground-bounce suppression (<0.8 V at 3.3 V), and SOP-20 package compatibility with legacy SO footprints.
Technical Context
The SN74LV245ANSR implements dual-bus directional control via DIR input and global 3-state enable via OE, enabling A→B or B→A data flow with bus isolation when OE is high. Its CMOS design includes overvoltage-tolerant inputs (up to 5.5 V regardless of VCC) and Ioff circuitry that disables outputs during power-down to prevent backflow current.
It exhibits low-noise switching behavior: typical VOLP (ground bounce) <0.8 V and VOHV (VOH undershoot) >2.3 V at 3.3 V/25°C, with slow edge rates minimizing ringing on light loads. Thermal resistance RθJA is 101.1°C/W in its NS (SO) package, supporting operation from –40°C to 125°C.
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 level shifters. |
| tpd (max) | 6.5 ns at VCC = 5 V, CL = 15 pF - ensures sub-150 MHz bus timing margin in high-speed control paths. |
| Ioff Current | ≤5 µA at VCC = 0 V - guarantees safe partial-power-down in hot-swap or multi-rail systems. |
| Output Drive | ±35 mA per pin - sufficient to drive 50 Ω transmission lines or multiple CMOS inputs without external buffers. |
| ESD Rating | 2000-V HBM - meets industrial handling requirements without additional protection circuitry. |
| Operating Temp | –40°C to 125°C - qualified for under-hood automotive modules and telecom base station line cards. |
Pinout & Package
SN74LV245ANSR uses a 20-pin SOP (NS) package measuring 12.60 mm × 5.30 mm, with standard SOIC footprint compatibility and 1.27 mm lead pitch. It is RoHS-compliant, NIPDAU lead-finished, and MSL Level-1 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | Low = B-to-A data flow; High = A-to-B data flow - determines real-time bus directionality. |
| OE (Pin 19) | Output enable input | Low = outputs active; High = all A/B ports enter high-impedance state - enables bus sharing and isolation. |
| A1–A8 (Pins 2–9) | Port A I/O terminals | Bidirectional data interface for one bus segment; tolerate up to 5.5 V regardless of VCC. |
| B1–B8 (Pins 11–18) | Port B I/O terminals | Bidirectional data interface for second bus segment; electrically isolated from Port A when OE is high. |
| VCC (Pin 20) | Power supply | Single supply for both input and output stages; no separate IOVDD required. |
| GND (Pin 10) | Ground reference | Common return path for all signals; requires low-inductance connection to minimize ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage operation | Ports accept 0–5.5 V inputs independent of VCC - eliminates external level translators in 3.3 V ↔ 5 V interconnects. |
| Ioff partial-power-down | Outputs disable automatically when VCC = 0 V - prevents backfeed current in powered-down subsystems. |
| Low ground bounce (VOLP) | <0.8 V at 3.3 V/25°C - reduces signal integrity risk in dense PCB layouts with shared ground planes. |
| Slow edge rate control | Controlled dV/dt minimizes overshoot/undershoot - avoids termination resistors in short-run bus traces. |
| High ESD immunity | 2000-V HBM rating - sustains factory handling and field maintenance without gate oxide damage. |
Applications
| Server Backplane Interface | LED Display Column Driver |
|---|---|
Use Scenario: Bidirectional communication between CPU module and peripheral expansion slots in 1U rack servers. IC Role / Device Role / Timing Role: Bus transceiver isolating control/data lanes between 5 V management controller and 3.3 V PCIe switch fabric. Use Value: Enables voltage-domain bridging without timing penalty (6.5 ns tpd) and eliminates need for discrete level shifters. | Use Scenario: Driving column segments of outdoor P10 LED matrix displays with multiplexed scanning. IC Role / Device Role / Timing Role: Octal buffer translating microcontroller GPIO outputs to higher-current column sink drivers. Use Value: ±35 mA per output sustains 1/8 duty-cycle brightness while Ioff prevents ghosting during blanking intervals. |
| Industrial Network Switch PHY Interface | Motor Control I/O Expander |
Use Scenario: Interfacing MAC-layer ASIC to PHY transceivers in managed Ethernet switches operating at 100 Mbps full-duplex. IC Role / Device Role / Timing Role: Direction-controlled data path between 3.3 V MAC and 2.5 V PHY, synchronized by DIR toggling on frame boundaries. Use Value: 3-state isolation during packet gaps prevents bus contention; VOLP <0.8 V maintains signal integrity across 10 cm PCB traces. | Use Scenario: Extending GPIO count for stepper motor phase sequencing and limit-switch monitoring in CNC motion controllers. IC Role / Device Role / Timing Role: Bidirectional port expander linking MCU to motor driver ICs and position sensors. Use Value: Mixed-voltage tolerance allows direct connection to 5 V Hall-effect sensors and 3.3 V drivers without external biasing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245A | Lower VCC range (1.65–3.6 V); faster tpd (5.3 ns @ 3.3 V); no 5 V tolerant inputs. | Restricted to 3.3 V-only systems; unsuitable for 5 V ↔ 3.3 V translation. | Select when operating exclusively at 3.3 V and maximum speed is critical. |
| 74ALVC245 | Wider VCC (1.65–3.6 V); higher drive (±24 mA); lower ICC (10 µA); no Ioff. | Lacks partial-power-down capability; not rated for 125°C operation. | Prefer for battery-powered portable devices where quiescent current dominates thermal budget. |
Compared with SN74LVC245A and 74ALVC245, the SN74LV245ANSR uniquely supports 5 V-tolerant inputs across its full 2–5.5 V VCC range and guarantees Ioff functionality for hot-swap compliance - making it the only choice for mixed-voltage industrial backplanes requiring robust power sequencing.
Availability
SN74LV245ANSR is available at Aetrix Electronics and suitable for server backplanes, LED display controllers, and industrial network switches requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LV245ANSR 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 for industrial, automotive, and communications markets.
The SN74LV245A product line delivers robust, wide-supply-voltage bus transceivers optimized for voltage-level bridging and noise-sensitive board-level interconnects in harsh-environment applications.
FAQ
What is the maximum propagation delay of the SN74LV245ANSR at 3.3 V?
The SN74LV245ANSR has a maximum propagation delay (tpd) of 11 ns at VCC = 3.3 V, CL = 15 pF, and TA = –40°C to 125°C. This value is specified in Section 6.7 of the TI datasheet SCLS382R and reflects worst-case timing across temperature and voltage extremes - critical for synchronous bus timing closure in industrial control systems where the SN74LV245ANSR is deployed.
Does the SN74LV245ANSR support 5 V logic inputs when powered at 3.3 V?
Yes, the SN74LV245ANSR supports 5.5 V-tolerant inputs regardless of VCC setting. When powered at 3.3 V, its A and B port inputs accept voltages up to 5.5 V without damage or clamping, enabling direct interfacing with 5 V microcontrollers or legacy peripherals - a core feature confirmed in Section 8.3 and Table 6.3 of the official datasheet.
What is the thermal resistance (RθJA) of the SN74LV245ANSR in its NS package?
The SN74LV245ANSR in the SOP-20 (NS) package has a junction-to-ambient thermal resistance (RθJA) of 101.1°C/W, as specified in Section 6.4 of the TI datasheet. This value assumes JEDEC-standard PCB mounting (2s2p copper layers) and is essential for thermal design validation in enclosed enclosures like telecom line cards where the SN74LV245ANSR operates continuously at 125°C ambient.
Can the SN74LV245ANSR be used in partial-power-down applications?
Yes, the SN74LV245ANSR includes Ioff circuitry that disables outputs when VCC = 0 V, limiting off-state current to ≤5 µA. This feature is explicitly validated per JESD78 and enables safe use in hot-plug systems such as modular server blades - a requirement directly addressed in Section 8.1 and Table 6.5 of the SN74LV245ANSR datasheet.
What package variant does SN74LV245ANSR use, and is it compatible with standard SOIC footprints?
The SN74LV245ANSR uses the SOP-20 (NS) package, measuring 12.60 mm × 5.30 mm with 1.27 mm lead pitch. It is mechanically and solder-reflow compatible with industry-standard SOIC-20 footprints, including pin 1 quadrant alignment (Q1) and tape-and-reel packaging (2000 pcs/reel), as documented in TI's Package Option Addendum for SN74LV245ANSR.
SN74LV245ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-SOIC (0.209", 5.30mm 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-SO
SN74LV245ANSR FAQ
1.How can I place an order for SN74LV245ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV245ANSR 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 SN74LV245ANSR reliable?
The price and inventory of SN74LV245ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV245ANSR is usually 5 days.
3.What payment methods are accepted for SN74LV245ANSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV245ANSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV245ANSR?
SN74LV245ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV245ANSR 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 SN74LV245ANSR?
For technical support, including SN74LV245ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV245ANSR requirements.
6.How does Aetrix verify that SN74LV245ANSR is sourced from the original manufacturer or authorized distributors?
All SN74LV245ANSR 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 SN74LV245ANSR meets industry standards.
7.What is the process for return or replacement of SN74LV245ANSR?
All SN74LV245ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV245ANSR, 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 SN74LV245ANSR part is unused and in its original packaging.
Return procedure for SN74LV245ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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