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Texas Instruments SN74LV245APWG4
- Part No.:
- SN74LV245APWG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LV245APWG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,672
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Product details
Overview
SN74LV245APWG4 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 propagation delay at 5 V, supports mixed-mode I/O (e.g., 5-V inputs into 3.3-V system), 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 SN74LV245APWG4 datasheet, SN74LV245APWG4 pinout, SN74LV245APWG4 application, or SN74LV245APWG4 equivalent, key selection criteria include its 20-pin TSSOP package, 3.3-V/5-V interoperability, ground-bounce performance (<0.8 V at 3.3 V), output undershoot margin (>2.3 V), and latch-up immunity exceeding 250 mA per JESD17.
Technical Context
The SN74LV245APWG4 implements dual 8-bit bidirectional data paths controlled by DIR (direction) and OE (output enable) logic inputs. Its CMOS design enables true down-translation - inputs tolerate up to 5.5 V regardless of VCC, allowing 5-V microcontrollers to safely drive 3.3-V buses without external level shifters.
It integrates Ioff circuitry that disables outputs during power-down, preventing back-current flow when VCC = 0 V, and meets stringent ESD ratings: 2000-V HBM, 200-V MM, and 1000-V CDM. Thermal resistance RθJA is 101.5°C/W in its TSSOP (PW) package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports single-supply operation across 3.3-V and 5-V systems without level-shifter ICs |
| tpd (max) | 6.5 ns at VCC = 5 V, CL = 15 pF - ensures timing compliance in high-speed bus interfaces up to ~150 MHz |
| VOLP (typ) | <0.8 V at VCC = 3.3 V - limits ground bounce to preserve signal integrity on shared PCB return planes |
| VOHV (typ) | >2.3 V at VCC = 3.3 V - maintains noise margin against undershoot-induced false logic transitions |
| Ioff (max) | 5 µA at VCC = 0 V - guarantees bus isolation during hot-swap or partial-power-down sequences |
| IOH/IOL | –16 mA / +16 mA at VCC = 4.5–5.5 V - drives standard TTL loads while limiting ringing via controlled edge rates |
| ESD HBM | 2000 V - exceeds JEDEC JS-001 Class 2, enabling robust handling in automated assembly environments |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 0.65 mm lead pitch, exposed pad optional (not electrically connected in this variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | High = A→B data flow; Low = B→A; determines real-time bus direction without reconfiguration overhead |
| A1–A8 (Pins 2–9) | Port A I/O terminals | Bidirectional data lines tied to local bus (e.g., MCU GPIO port); tolerate 5.5-V inputs at any VCC |
| GND (Pin 10) | Ground reference | Primary return path for all I/O and supply currents; must be low-inductance connection to minimize VOLP |
| B1–B8 (Pins 11–18) | Port B I/O terminals | Bidirectional data lines tied to remote bus (e.g., LED column driver array); support mixed-voltage signaling |
| OE (Pin 19) | Output enable input | Active-Low: drives all A/B pins to high-impedance state when high; required for bus arbitration and isolation |
| VCC (Pin 20) | Power supply | Single supply for both input and output stages; bypassing with 0.1 µF ceramic capacitor is mandatory |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage operation | Inputs accept up to 5.5 V independent of VCC - eliminates external level translators in 3.3-V/5-V interconnects |
| Ioff partial-power-down | Outputs disable with leakage <5 µA when VCC = 0 - prevents backfeeding and enables safe hot-plug operation |
| Low ground bounce (VOLP) | <0.8 V typical at 3.3 V - reduces simultaneous switching noise on shared ground planes in dense PCB layouts |
| Controlled edge rates | Slow slew minimizes overshoot/undershoot - avoids signal integrity issues driving capacitive LED display buses |
| Latch-up immunity | >250 mA per JESD17 - ensures robustness against transient current faults in industrial environments |
Applications
| LED Display Column Driver | Industrial I/O Expander Interface |
|---|---|
|
Use Scenario: Driving 8-bit column data from a 3.3-V FPGA to a 5-V LED matrix with common-cathode architecture. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver buffering FPGA outputs to higher-voltage LED sink drivers. Use Value: Eliminates discrete level shifters; VOLP <0.8 V prevents ghosting on adjacent columns due to ground bounce. |
Use Scenario: Extending GPIO count of a 5-V PLC controller to interface with 3.3-V sensors and actuators. IC Role / Device Role / Timing Role: Isolating and translating control signals between mismatched voltage domains while maintaining timing predictability. Use Value: Ioff enables safe power sequencing; tpd ≤6.5 ns ensures deterministic response within 100-µs PLC scan cycles. |
| Telecom Backplane Data Link | Motor Driver Control Bus |
|
Use Scenario: Interfacing a 3.3-V packet processor to legacy 5-V backplane transceivers in network switches. IC Role / Device Role / Timing Role: Asynchronous bus bridge providing direction-controlled data forwarding with OE-gated isolation. Use Value: Supports hot-swap via Ioff; ESD rating (2000-V HBM) withstands handling in telecom equipment repair workflows. |
Use Scenario: Transmitting PWM and direction commands from a 5-V microcontroller to 3.3-V gate-driver ICs in BLDC motor inverters. IC Role / Device Role / Timing Role: Voltage-tolerant signal conditioner ensuring clean command delivery despite supply rail mismatches. Use Value: VOHV >2.3 V prevents false turn-on of MOSFET gates during fast edge transitions on noisy motor drive boards. |
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 (≤5.2 ns at 3.3 V), but no Ioff support | Suitable for always-powered 3.3-V-only systems; not safe for partial-power-down scenarios | Choose when maximum speed in 3.3-V domain is critical and power sequencing is fixed |
| 74AVC245 | Wider VCC range (1.2–3.6 V), higher drive (±24 mA), but input tolerance limited to VCC + 0.3 V | Requires external level shifters for 5-V interfacing; optimized for ultra-low-voltage mobile SoC interconnects | Choose only for sub-3.6-V systems with tight power budgets; avoid for mixed 3.3/5-V use |
Compared with SN74LVC245A and 74AVC245, the SN74LV245APWG4 uniquely balances 5.5-V input tolerance, Ioff-enabled power-down safety, and moderate speed - making it the only option among the three qualified for hot-pluggable 5-V/3.3-V bus bridging in industrial and telecom infrastructure.
Availability
SN74LV245APWG4 is available at Aetrix Electronics and suitable for LED displays, industrial I/O expanders, and telecom infrastructure requiring stable component supply across extended temperature ranges (–40°C to 125°C) and long production lifecycles.
Supply support for SN74LV245APWG4 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 decades of experience in industrial-grade logic and interface solutions.
The SN74LV245A product line targets robust, mixed-voltage bus interfacing in harsh environments - designed specifically for reliability-critical applications including motor control, telecom infrastructure, and LED video walls.
FAQ
What is the maximum operating temperature for SN74LV245APWG4?
The SN74LV245APWG4 is rated for continuous operation from –40°C to +125°C ambient temperature. This extended range is validated per TI's thermal characterization data (RθJA = 101.5°C/W in TSSOP), making SN74LV245APWG4 suitable for under-hood automotive modules, industrial motor drives, and outdoor telecom equipment where thermal stress is significant.
Does SN74LV245APWG4 support 5-V to 3.3-V level translation?
Yes, SN74LV245APWG4 supports true 5-V-to-3.3-V down-translation: its inputs tolerate up to 5.5 V regardless of VCC setting, and outputs swing rail-to-rail (0 V to VCC). When VCC = 3.3 V, SN74LV245APWG4 accepts 5-V logic inputs and drives 3.3-V compatible loads - eliminating need for external translators in mixed-voltage systems.
What is the purpose of the Ioff feature in SN74LV245APWG4?
The Ioff feature in SN74LV245APWG4 disables output buffers and limits leakage current to ≤5 µA when VCC = 0 V, preventing damaging back-current flow from live buses into unpowered sections. This enables safe hot-swap, partial-power-down, and power sequencing in modular systems - a capability absent in standard LVC-family transceivers.
Can SN74LV245APWG4 be used without pull-up resistors on OE and DIR?
OE and DIR are CMOS inputs with ±1 µA leakage, so they may float to indeterminate states if unconnected. TI recommends tying OE to VCC via a pull-up resistor (value determined by driver strength) to ensure high-impedance default on power-up. DIR should be actively driven or pulled to a defined logic level; floating DIR causes undefined bus direction and potential contention.
What package type does SN74LV245APWG4 use, and is it RoHS-compliant?
SN74LV245APWG4 uses the TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 0.65 mm lead pitch, with NiPdAu (NIPDAU) lead finish. It is RoHS-compliant (per TI's Package Option Addendum), rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH), and supplied in 2000-piece tape-and-reel format.
SN74LV245APWG4 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
SN74LV245APWG4 FAQ
1.How can I place an order for SN74LV245APWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV245APWG4 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 SN74LV245APWG4 reliable?
The price and inventory of SN74LV245APWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV245APWG4 is usually 5 days.
3.What payment methods are accepted for SN74LV245APWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV245APWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV245APWG4?
SN74LV245APWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV245APWG4 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 SN74LV245APWG4?
For technical support, including SN74LV245APWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV245APWG4 requirements.
6.How does Aetrix verify that SN74LV245APWG4 is sourced from the original manufacturer or authorized distributors?
All SN74LV245APWG4 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 SN74LV245APWG4 meets industry standards.
7.What is the process for return or replacement of SN74LV245APWG4?
All SN74LV245APWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV245APWG4, 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 SN74LV245APWG4 part is unused and in its original packaging.
Return procedure for SN74LV245APWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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