My Inquiry
My Account
Texas Instruments SN74LV245AZQNR
- Part No.:
- SN74LV245AZQNR
- Manufacturer:
- Texas Instruments
- Package:
- 20-VFBGA
- Datasheet:
-
SN74LV245AZQNR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20BGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,404
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LV245AZQNR 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 propagation delay at 5 V, supports mixed-mode voltage translation (e.g., 5 V → 3.3 V), and features Ioff for partial-power-down protection. It is used in LED display column drivers where level-shifting and bus isolation are required.
For engineers reviewing the SN74LV245AZQNR datasheet, SN74LV245AZQNR pinout, SN74LV245AZQNR application, or SN74LV245AZQNR equivalent, key selection criteria include its 20-pin VQFN (RKS) package, 3.3 V/5 V mixed-voltage I/O tolerance, guaranteed tpd ≤7 ns across –40°C to 125°C, and Ioff-enabled hot-swap capability in industrial backplanes.
Technical Context
The SN74LV245AZQNR implements a dual-bus directional control architecture using a single DIR input to select A→B or B→A data flow, 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 regardless of VCC setting.
It integrates Ioff circuitry that actively disables outputs during power-down, preventing back-current flow when one bus remains live - critical for hot-plug systems. Ground bounce (VOLP < 0.8 V) and undershoot (VOHV > 2.3 V) are characterized at 3.3 V, confirming signal integrity under fast switching into 15–50 pF loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports direct interface between 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 - enables reliable operation in high-speed bus applications up to ~100 MHz data rate. |
| Ioff Current | ≤5 µA at VCC = 0 V - guarantees safe isolation during partial power-down, eliminating risk of damaging current injection. |
| Input Voltage Tolerance | Up to 5.5 V on all I/O pins - allows 5 V signals to be safely driven into a 3.3 V-powered device for down-translation. |
| ESD Rating (HBM) | 2000 V - exceeds JEDEC JESD22-A114A, supporting robust handling in automated assembly and field-replaceable modules. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial motor drives, and telecom infrastructure environments. |
| Output Drive | ±16 mA at VCC = 4.5–5.5 V - sufficient to drive multiple CMOS inputs or moderate capacitive loads (≤50 pF) without external buffers. |
Pinout & Package
SN74LV245AZQNR is packaged in a 20-pin VQFN with 4.50 mm × 2.50 mm body size and 0.4 mm pitch (RKS package). The exposed thermal pad enhances thermal dissipation in high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | Logic HIGH routes data from A-bus to B-bus; LOW routes from B-bus to A-bus - enables flexible bidirectional bus arbitration. |
| OE (Pin 19) | Output enable input | Active-LOW signal; when HIGH, all A/B I/Os enter high-impedance state - essential for bus sharing and conflict avoidance. |
| A1–A8 (Pins 2–9) | Port A I/O terminals | Bidirectional data lines tied to one bus segment; tolerate 0–5.5 V regardless of VCC - ideal for legacy 5 V subsystem interfacing. |
| B1–B8 (Pins 11–18) | Port B I/O terminals | Bidirectional data lines tied to second bus segment; fully symmetric to Port A - supports mirror-image board layout. |
| VCC (Pin 20) | Power supply | Single-supply rail powering internal logic and output drivers; bypass capacitor required per TI layout guidelines. |
| GND (Pin 10) | Ground reference | Common return path for all I/O and internal circuitry; must be 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 need for discrete level translators in multi-voltage systems. |
| Ioff partial-power-down support | Outputs disable automatically when VCC = 0 V - prevents backflow current in hot-swap or modular backplane applications. |
| Low ground bounce (VOLP) | <0.8 V at VCC = 3.3 V - reduces noise coupling into adjacent analog or RF sections on shared PCBs. |
| Controlled edge rates | Slow slew minimizes overshoot/undershoot - improves signal integrity on unterminated traces in LED display and I/O expander designs. |
| High ESD immunity | 2000-V HBM, 1000-V CDM - meets industrial handling requirements and reduces field failure risk in unshielded enclosures. |
Applications
| LED Display Column Driver | Industrial I/O Expander |
|---|---|
|
Use Scenario: Driving multiplexed column lines in outdoor LED signage with 5 V controller and 3.3 V FPGA timing logic. IC Role / Device Role / Timing Role: Bidirectional level translator and bus isolator between controller and display driver ICs. Use Value: Enables direct 5 V → 3.3 V down-translation without external resistors or translators, reducing BOM count and layout area. |
Use Scenario: Extending GPIO count of a PLC CPU module via SPI/I²C-connected remote I/O node. IC Role / Device Role / Timing Role: Isolating and buffering local sensor/actuator buses from main controller bus during fault conditions. Use Value: Ioff protection prevents damage when remote I/O module is hot-swapped while CPU remains powered. |
| Telecom Backplane Interface | Motor Drive Control Bus |
|
Use Scenario: Interfacing line-card ASICs (3.3 V) to shelf-management MCU (5 V) in carrier-grade switches. IC Role / Device Role / Timing Role: Direction-controlled data bridge enabling configuration readback and firmware update paths. Use Value: Guaranteed tpd ≤7 ns at 125°C ensures deterministic timing margin for register access within 100 ns windows. |
Use Scenario: Isolating microcontroller GPIOs from high-noise gate-driver feedback lines in BLDC inverter modules. IC Role / Device Role / Timing Role: Unidirectional signal conditioner for hall-effect sensor inputs routed to MCU ADC inputs. Use Value: Input overvoltage tolerance protects MCU pins from transient coupling during MOSFET switching 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 |
|---|---|---|---|
| SN74LVC245A | Lower VCC range (1.65–3.6 V); no 5 V tolerance on I/Os - requires external clamping for 5 V signals. | Suitable only for pure 3.3 V systems; cannot replace SN74LV245AZQNR in mixed-voltage or 5 V legacy interfaces. | Select when operating exclusively at 3.3 V and lowest possible static current (<1 µA ICC) is prioritized. |
| 74ALVC245 | Faster tpd (≤3.3 ns at 3.3 V) but narrower VCC range (1.65–3.6 V); no Ioff support - unsafe for partial-power-down. | Lacks hot-swap safety; unsuitable for modular telecom or industrial backplanes requiring live insertion. | Choose only for speed-critical, fully powered 3.3 V-only buses where thermal shutdown risk is mitigated externally. |
Compared with SN74LVC245A and 74ALVC245, SN74LV245AZQNR uniquely combines 5.5 V I/O tolerance, Ioff-enabled power sequencing, and –40°C to 125°C operation - making it the only option qualified for mixed-voltage industrial hot-swap applications without redesign.
Availability
SN74LV245AZQNR is available at Aetrix Electronics and suitable for LED displays, industrial I/O expanders, and telecom backplane interfaces requiring stable component supply across extended temperature and mixed-voltage conditions.
Supply support for SN74LV245AZQNR 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, wide-supply-voltage bus interfacing in harsh environments - engineered for reliability in motor drives, telecom infrastructure, and outdoor LED systems.
FAQ
What is the package type and footprint of SN74LV245AZQNR?
SN74LV245AZQNR uses a 20-pin VQFN package with RKS designation: 4.50 mm × 2.50 mm body, 0.4 mm pitch, and exposed thermal pad. Its compact footprint supports high-density routing in space-constrained LED display controllers and industrial I/O modules. The RKS variant is distinct from larger DB, DW, or PW packages listed for other SN74LV245A variants.
Does SN74LV245AZQNR support 5 V to 3.3 V level translation?
Yes, SN74LV245AZQNR supports true bidirectional level translation: inputs tolerate up to 5.5 V regardless of VCC setting, allowing 5 V signals to be safely driven into a 3.3 V-powered device. This enables direct down-translation without external components - confirmed by TI's "mixed-mode voltage operation" feature and VI absolute max rating of 7 V.
What is the maximum propagation delay for SN74LV245AZQNR at 3.3 V?
At VCC = 3.3 V, CL = 15 pF, and TA = –40°C to 125°C, the maximum propagation delay (tpd) of SN74LV245AZQNR is 11 ns. This value is specified in Section 6.7 of the datasheet and ensures timing compliance in high-speed industrial bus interfaces operating across full temperature range.
How does Ioff functionality protect SN74LV245AZQNR during power sequencing?
Ioff in SN74LV245AZQNR disables all outputs when VCC = 0 V, limiting off-state current to ≤5 µA. This prevents back-current flow from live buses into a powered-down device - critical for hot-swap backplanes and modular PLC I/O systems where subsystems power up/down independently.
Is SN74LV245AZQNR pin-compatible with other SN74LV245A variants?
No - SN74LV245AZQNR uses the RKS (20-pin VQFN, 4.50 mm × 2.50 mm) package, which has different pad layout, thermal pad configuration, and pin pitch than DB (SSOP), DW (SOIC), or PW (TSSOP) variants. Mechanical incompatibility means PCB redesign is required when substituting package types, even though logic function and pin numbering are identical.
SN74LV245AZQNR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-VFBGA
- Packaging:
- Tape & Reel (TR)
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-BGA MICROSTAR JUNIOR (4x3)
SN74LV245AZQNR FAQ
1.How can I place an order for SN74LV245AZQNR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV245AZQNR 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 SN74LV245AZQNR reliable?
The price and inventory of SN74LV245AZQNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV245AZQNR is usually 5 days.
3.What payment methods are accepted for SN74LV245AZQNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV245AZQNR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV245AZQNR?
SN74LV245AZQNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV245AZQNR 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 SN74LV245AZQNR?
For technical support, including SN74LV245AZQNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV245AZQNR requirements.
6.How does Aetrix verify that SN74LV245AZQNR is sourced from the original manufacturer or authorized distributors?
All SN74LV245AZQNR 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 SN74LV245AZQNR meets industry standards.
7.What is the process for return or replacement of SN74LV245AZQNR?
All SN74LV245AZQNR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV245AZQNR, 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 SN74LV245AZQNR part is unused and in its original packaging.
Return procedure for SN74LV245AZQNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LV245AZQNR Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
