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Texas Instruments SN74LV245APW
- Part No.:
- SN74LV245APW
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LV245APW.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,923
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Product details
Overview
SN74LV245APW from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between voltage-divergent buses. It operates from 2 V to 5.5 V, delivers ≤6.5 ns 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 display column drivers where level-shifting and bus contention control are critical.
For engineers reviewing the SN74LV245APW datasheet, SN74LV245APW pinout, SN74LV245APW application, or SN74LV245APW equivalent, key selection criteria include its 20-pin TSSOP package, 3-state bidirectional control via DIR/OE pins, guaranteed 35 mA output drive per channel, and JESD78 latch-up immunity exceeding 250 mA.
Technical Context
The SN74LV245APW implements a dual-bus, direction-controlled transceiver architecture with independent A- and B-side I/O ports. Its DIR input selects data flow direction (A→B or B→A), while OE enables/disables all outputs into high-impedance state - both inputs accept 0–5.5 V regardless of VCC.
It integrates Ioff circuitry that disables outputs during power-down to prevent back-current, and features slow edge-rate design to suppress output ringing and ground bounce (VOLP < 0.8 V at 3.3 V). ESD protection meets 2000-V HBM, 1000-V CDM, and 200-V MM per JESD22.
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 hot-insertion or partial system power-down. |
| Output Drive | ±35 mA per pin - sufficient to directly drive 50 Ω transmission lines or multiple CMOS loads without buffers. |
| Input Voltage Range | 0 V to 5.5 V on all I/O and control pins - allows overvoltage-tolerant interfacing to legacy 5 V systems while powered from 3.3 V. |
| Operating Temp | –40°C to +125°C - qualified for industrial and automotive under-hood environments without derating. |
| ESD HBM | 2000 V - exceeds JEDEC JS-001 Class 2, reducing field failure risk in manual handling and board assembly. |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 0.65 mm lead pitch, exposed pad not present, RoHS-compliant NiPdAu lead finish, MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | Low = B→A data flow; High = A→B data flow - determines real-time bus direction without reset or configuration registers. |
| A1–A8 (Pins 2–9) | Port A I/O terminals | Bidirectional data lines tied to one bus segment; tolerate up to 5.5 V regardless of VCC - enable down-translation. |
| GND (Pin 10) | Ground reference | Primary return path for all I/O and internal logic; must be low-inductance connection to minimize ground bounce. |
| B8–B1 (Pins 11–18) | Port B I/O terminals | Complementary bidirectional data lines for second bus segment; electrically identical to A-port with same voltage tolerance. |
| OE (Pin 19) | Output enable input | Active-low control: Low = outputs enabled; High = all A/B pins enter high-Z - isolates buses during idle or fault conditions. |
| VCC (Pin 20) | Power supply | Single-supply rail powering internal logic and output drivers; requires local 0.1 µF ceramic bypass capacitor per VCC pin. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage operation | Ports accept 0–5.5 V inputs while VCC is as low as 2 V - eliminates external translators when interfacing 5 V microcontrollers to 3.3 V FPGAs. |
| Slow edge-rate control | Controlled slew rate minimizes overshoot/undershoot and reduces EMI - critical for noise-sensitive LED display and telecom backplane applications. |
| Ioff partial-power-down | Outputs disable automatically when VCC = 0 V - prevents current backflow from live buses into unpowered subsystems during hot-swap events. |
| High noise immunity | VIH/VIL thresholds scale with VCC (e.g., VIH = 0.7×VCC), ensuring robust logic recognition across supply variations and PCB trace noise. |
| Thermal performance | RθJA = 101.5°C/W in PW package - supports continuous operation at full drive in 70°C ambient with minimal heatsinking. |
Applications
| LED Display Column Driver | Industrial I/O Expander |
|---|---|
|
Use Scenario: Driving 8-bit column segments of high-density monochrome LED matrices with 5 V row drivers and 3.3 V controller logic. IC Role / Device Role / Timing Role: Bidirectional level-translating buffer that isolates controller from column sink current while translating 3.3 V logic to 5 V-compatible inputs. Use Value: Eliminates discrete level shifters and reduces BOM count by 8×; 6.5 ns tpd ensures precise column blanking timing synchronization. |
Use Scenario: Extending GPIO count of a PLC CPU module using SPI-to-parallel bridge, requiring isolated 3.3 V logic to 24 V field-side interface. IC Role / Device Role / Timing Role: Bus-isolated transceiver enabling safe data exchange between low-voltage control logic and opto-isolated 24 V I/O banks. Use Value: Ioff protection prevents damage during field wiring faults; ±35 mA drive directly sources/sinks industrial sensor inputs without external drivers. |
| Network Switch Backplane Interface | Motor Driver Control Bus |
|
Use Scenario: Interfacing 3.3 V packet processor ASIC to 5 V PHY management bus in 10/100 Mbps Ethernet switch hardware. IC Role / Device Role / Timing Role: Asynchronous bidirectional data coupler synchronizing register reads/writes between mismatched voltage domains. Use Value: Guaranteed 5.5 V-tolerant inputs allow direct connection to 5 V management bus; 3-state OE enables dynamic bus arbitration without contention. |
Use Scenario: Transmitting PWM and direction signals from 3.3 V MCU to multi-channel H-bridge gate driver ICs operating at 5 V logic levels. IC Role / Device Role / Timing Role: Robust signal translator buffering MCU outputs against gate driver input capacitance and switching noise. Use Value: Slow edge rates suppress ringing-induced false triggering; VOLP < 0.8 V ensures clean low-state definition even under heavy capacitive loading. |
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 range (1.65–3.6 V); faster tpd (2.8 ns @ 3.3 V); no 5.5 V input tolerance. | Restricted to 3.3 V-only systems; unsuitable for 5 V ↔ 3.3 V translation or mixed-voltage backplanes. | Select only when full 5 V compatibility is unnecessary and speed >6.5 ns is required. |
| 74ALVC245 | Wider VCC (1.65–3.6 V); higher drive (±24 mA); lower ICC (10 µA); no Ioff support. | Lacks partial-power-down capability; cannot safely isolate unpowered sections in hot-swap designs. | Prefer for ultra-low-power 3.3 V embedded systems where Ioff is not needed and thermal budget is tight. |
Compared with SN74LV245APW, SN74LVC245A offers higher speed but sacrifices 5 V input tolerance and mixed-voltage flexibility, while 74ALVC245 reduces static power but removes critical Ioff protection for industrial power sequencing.
Availability
SN74LV245APW is available at Aetrix Electronics and suitable for LED display drivers, industrial I/O expanders, and network switch backplane interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LV245APW 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 logic solutions, with decades of expertise in industrial-grade interface ICs and broad portfolio support.
The SN74LV245A product line targets robust, voltage-flexible bus interfacing in harsh environments - designed specifically for industrial automation, telecom infrastructure, and display systems demanding reliability and mixed-voltage interoperability.
FAQ
What is the maximum recommended load capacitance for SN74LV245APW to maintain 6.5 ns propagation delay?
The 6.5 ns maximum tpd is specified at VCC = 5 V with CL = 15 pF. At CL = 50 pF, tpd increases to 9 ns. For designs requiring strict 6.5 ns timing, keep total trace + load capacitance ≤15 pF and use series termination if driving longer traces.
Can SN74LV245APW safely interface a 5 V microcontroller to a 3.3 V FPGA without external level shifters?
Yes. SN74LV245APW accepts 0–5.5 V inputs on all A/B ports and control pins while operating from 3.3 V VCC, enabling direct 5 V → 3.3 V down-translation. Its outputs swing rail-to-rail (VOL < 0.1 V, VOH > VCC – 0.1 V), meeting FPGA input thresholds.
Does SN74LV245APW require pull-up resistors on DIR or OE pins for reliable startup behavior?
OE should be tied to VCC via a pull-up resistor (typically 10 kΩ) to ensure outputs remain in high-Z during power-up. DIR has no power-on default requirement - its state defines initial data direction, so tie it explicitly to VCC or GND based on system needs.
Is SN74LV245APW pin-compatible with other packages in the SN74LV245A family?
No. While functionally identical, SN74LV245APW uses the 20-pin TSSOP (PW) package with 6.50 mm × 4.40 mm body and 0.65 mm pitch. SSOP (DB), TVSOP (DGV), and VQFN (RGY) variants have different footprints and thermal pads - PCB layout is not interchangeable.
What thermal derating applies to SN74LV245APW when operating at 125°C ambient?
At TA = 125°C, SN74LV245APW maintains full specifications per datasheet. With RθJA = 101.5°C/W, junction temperature rise is ~102°C at 1 W dissipation - limit total power to ≤495 mW (ICC × VCC + IOL² × RDS(on)) to stay below 150°C max TJ.
SN74LV245APW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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-TSSOP
SN74LV245APW FAQ
1.How can I place an order for SN74LV245APW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV245APW 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 SN74LV245APW reliable?
The price and inventory of SN74LV245APW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV245APW is usually 5 days.
3.What payment methods are accepted for SN74LV245APW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV245APW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV245APW?
SN74LV245APW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV245APW 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 SN74LV245APW?
For technical support, including SN74LV245APW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV245APW requirements.
6.How does Aetrix verify that SN74LV245APW is sourced from the original manufacturer or authorized distributors?
All SN74LV245APW 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 SN74LV245APW meets industry standards.
7.What is the process for return or replacement of SN74LV245APW?
All SN74LV245APW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV245APW, 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 SN74LV245APW part is unused and in its original packaging.
Return procedure for SN74LV245APW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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