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Texas Instruments SN74LV245ANS
- Part No.:
- SN74LV245ANS
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LV245ANS.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,870
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Product details
Overview
SN74LV245ANS from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between voltage-domain-isolated buses. It operates from 2 V to 5.5 V, delivers 6.5 ns max propagation delay at 5 V, supports mixed-mode voltage translation (e.g., 5 V → 3.3 V), and features Ioff for partial-power-down mode - used in server backplanes and telecom infrastructure I/O expansion.
For engineers reviewing the SN74LV245ANS datasheet, SN74LV245ANS pinout, SN74LV245ANS application, or SN74LV245ANS equivalent, key selection criteria include its 20-pin SOP (NS) package, 3-state bus isolation capability, ±35 mA output drive, latch-up immunity (>250 mA), and ESD robustness (2000-V HBM).
Technical Context
The SN74LV245ANS implements a dual-bus directional control architecture using DIR and OE inputs: DIR selects data flow direction (A→B or B→A), while OE enables/disables all outputs into high-impedance state. Its CMOS design ensures rail-to-rail output swing and overvoltage-tolerant inputs (up to 5.5 V) independent of VCC.
It integrates Ioff circuitry that disables outputs during power-down, preventing backflow current when VCC = 0 V. Noise suppression is achieved via controlled edge rates (20 ns/V min at 5 V), reducing ground bounce (VOLP < 0.8 V at 3.3 V) and undershoot (VOHV > 2.3 V at 3.3 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports mixed-voltage system interfacing without level shifters |
| tpd (max) | 6.5 ns at VCC = 5 V - enables high-speed bus handshaking in 25-MHz+ applications |
| Ioff Current | ≤5 µA - guarantees safe isolation during hot-swap or partial-power-down sequences |
| Output Drive | ±35 mA per pin - sufficient for driving 50-pF loads with <11 ns rise/fall times |
| ESD Rating | 2000-V HBM - meets industrial-grade handling requirements without special ESD controls |
| Operating Temp | –40°C to +125°C - qualified for extended-temperature telecom and motor-control environments |
| Input Tolerance | Up to 5.5 V regardless of VCC - allows direct connection to 5-V logic while powered from 3.3 V |
Pinout & Package
SN74LV245ANS uses a 20-pin SOP (NS) package measuring 12.60 mm × 5.30 mm, with standard SOIC footprint compatibility and gull-wing leads for reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | High = A→B data flow; Low = B→A - determines real-time bus arbitration path |
| OE (Pin 19) | Output enable input | Low = outputs active; High = all outputs in high-Z - enables bus sharing across multiple drivers |
| A1–A8 (Pins 2–9) | Port A I/O terminals | Bidirectional data lines tied to local bus; tolerate up to 5.5 V regardless of VCC |
| B1–B8 (Pins 11–18) | Port B I/O terminals | Bidirectional data lines tied to remote bus; fully symmetric with Port A |
| GND (Pin 10) | Ground reference | Primary return path for all I/O and supply currents - must be low-inductance connection |
| VCC (Pin 20) | Power supply | Single supply for both input and output stages - bypass capacitor required per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage operation | Enables interface between 2.5-V, 3.3-V, and 5-V buses without external level translators |
| Ioff partial-power-down support | Prevents damaging current flow when VCC = 0 V - essential for hot-plug I/O modules |
| Slow edge-rate control | Reduces EMI and signal integrity issues on long PCB traces or unterminated stubs |
| Overvoltage-tolerant inputs | Accepts 5.5-V signals at any valid VCC - simplifies legacy 5-V peripheral integration |
| Latch-up immunity | Exceeds 250 mA per JESD17 - ensures reliability in noisy industrial power environments |
Applications
| Server Backplane Interface | LED Display Controller I/O Expansion |
|---|---|
Use Scenario: Isolating control signals between baseboard management controller (BMC) and hot-swap module slots. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing SMBus, GPIO, and reset signaling across voltage domains. Use Value: Eliminates need for discrete level shifters while maintaining 6.5 ns timing margin for 25-MHz clocked interfaces. |
Use Scenario: Expanding microcontroller GPIO count to drive row/column drivers in large-format LED signage. IC Role / Device Role / Timing Role: Octal buffer isolating MCU pins from high-current LED sink drivers. Use Value: ±35 mA per output drives 16-mA LED segments directly; Ioff prevents backfeed during display power cycling. |
| Network Switch Control Plane | Industrial Motor Driver Interface |
Use Scenario: Interfacing FPGA-based packet classifier with ASIC-based queuing engines operating at different supply voltages. IC Role / Device Role / Timing Role: Direction-controlled data bridge synchronizing configuration registers and status feedback. Use Value: 3.3-V FPGA safely communicates with 5-V PHY controllers using single-supply SN74LV245ANS. |
Use Scenario: Connecting motion controller outputs to isolated gate drivers in servo amplifier modules. IC Role / Device Role / Timing Role: Level-translating and isolating PWM and fault-signaling lines between logic and power stages. Use Value: Overvoltage-tolerant inputs accept 5-V encoder feedback; slow edges suppress MOSFET gate ringing. |
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); faster tpd (5.2 ns @ 3.3 V); no 5-V input tolerance | Suitable only for 3.3-V-only systems; cannot replace SN74LV245ANS in mixed 5-V/3.3-V designs | Select when full 5-V input compatibility is unnecessary and lower supply voltage is mandated |
| 74ALVC245MTCX | Wider VCC (1.65–3.6 V); higher drive (±24 mA); smaller TSSOP-20 package (4.4 × 6.5 mm) | Limited to 3.3-V domains; lacks Ioff and 5-V tolerant inputs - unsuitable for hot-swap or legacy 5-V integration | Choose for space-constrained 3.3-V embedded controllers where thermal performance outweighs voltage flexibility |
Compared with SN74LV245ANS, SN74LVC245APW offers better speed in 3.3-V systems but forfeits 5-V input support, while 74ALVC245MTCX reduces board area yet omits critical mixed-voltage and power-down safety features required in infrastructure equipment.
Availability
SN74LV245ANS is available at Aetrix Electronics and suitable for server backplanes, LED display controllers, and network switch control planes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LV245ANS 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 decades of expertise in logic interface ICs for industrial and communications infrastructure.
The SN74LV245A family was engineered to solve voltage-domain bridging challenges in multi-rail systems - delivering robust 3-state isolation, Ioff safety, and wide-VCC operation for telecom, computing, and motor control applications.
FAQ
What is the maximum propagation delay of the SN74LV245ANS at 5 V?
The SN74LV245ANS has a maximum propagation delay (tpd) of 6.5 ns at VCC = 5 V with CL = 15 pF and TA = –40°C to +125°C. This value is specified under worst-case switching conditions and ensures timing compliance in high-speed bus applications such as server baseboard interfaces.
Does the SN74LV245ANS support 5-V input signals when powered from 3.3 V?
Yes, the SN74LV245ANS supports input voltages up to 5.5 V on all I/O pins regardless of VCC level. When powered from 3.3 V, it safely accepts 5-V logic signals from legacy peripherals - a key feature enabling seamless integration without external level shifters.
What is the purpose of the Ioff specification for the SN74LV245ANS?
The Ioff specification (≤5 µA) ensures that all outputs are disabled and leakage current is minimized when VCC = 0 V. This protects downstream circuitry during hot-swap events or partial-power-down modes - a critical requirement in modular telecom and server systems using SN74LV245ANS.
Which package type does the SN74LV245ANS use?
The SN74LV245ANS uses a 20-pin SOP (NS) package with dimensions 12.60 mm × 5.30 mm. It is distinct from SSOP (DB), TSSOP (PW), or VQFN variants - this NS variant provides SOIC-compatible footprint and gull-wing lead form for standard reflow assembly.
How does the DIR pin control data flow direction in the SN74LV245ANS?
The DIR pin on the SN74LV245ANS determines real-time data direction: logic high enables transmission from Port A to Port B; logic low enables transmission from Port B to Port A. This bidirectional control allows dynamic bus arbitration without changing hardware connections.
SN74LV245ANS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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-SO
SN74LV245ANS FAQ
1.How can I place an order for SN74LV245ANS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV245ANS 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 SN74LV245ANS reliable?
The price and inventory of SN74LV245ANS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV245ANS is usually 5 days.
3.What payment methods are accepted for SN74LV245ANS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV245ANS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV245ANS?
SN74LV245ANS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV245ANS 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 SN74LV245ANS?
For technical support, including SN74LV245ANS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV245ANS requirements.
6.How does Aetrix verify that SN74LV245ANS is sourced from the original manufacturer or authorized distributors?
All SN74LV245ANS 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 SN74LV245ANS meets industry standards.
7.What is the process for return or replacement of SN74LV245ANS?
All SN74LV245ANS units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV245ANS, 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 SN74LV245ANS part is unused and in its original packaging.
Return procedure for SN74LV245ANS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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