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NXP Semiconductors 74LVT245DB,118
- Part No.:
- 74LVT245DB,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74LVT245DB,118.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:52,000
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Product details
Overview
74LVT245DB,118 from Nexperia is a 3.3 V octal bidirectional transceiver with direction control (DIR) and 3-state output enable (OE), designed for high-speed bus interface between 3.3 V logic domains and 5 V-tolerant systems. It features bus-hold inputs eliminating external pull-ups, ±64 mA/–32 mA drive capability, and operates from –40 °C to +85 °C. Used in backplane data routing, FPGA I/O expansion, and mixed-voltage microcontroller peripheral interfacing.
For engineers reviewing the 74LVT245DB,118 datasheet, 74LVT245DB,118 pinout, 74LVT245DB,118 application, or 74LVT245DB,118 equivalent, key selection criteria include 5.5 V overvoltage-tolerant inputs, sub-5 ns propagation delay at 3.3 V, IOFF power-down protection, live insertion support, and compatibility with TTL-level signaling without level shifters.
Technical Context
This BiCMOS transceiver implements an octal bidirectional data path controlled by DIR (pin 1) and OE (pin 19), enabling synchronous A↔B bus transfer or high-impedance isolation. Its bus-hold circuitry maintains valid logic states on unused inputs without external biasing, reducing BOM count and layout complexity.
The device supports hot-plug operation via IOFF circuitry that disables outputs when VCC = 0 V, preventing back-driving of powered buses. Input clamping and ESD protection (HBM >2000 V, CDM >1000 V) ensure robustness in industrial and telecom environments with noisy signal paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 2.7 V to 3.6 V - ensures stable operation across wide 3.3 V rail tolerances, including brown-out conditions. |
| Input voltage tolerance | Up to 5.5 V - allows direct connection to 5 V buses without level-shifting components. |
| Propagation delay | 1.0–4.0 ns (tPLH/tPHL at VCC = 3.3 V) - enables >200 MHz bus clocking in point-to-point configurations. |
| Output drive | +64 mA / –32 mA - drives heavy capacitive loads (e.g., long traces, multiple CMOS inputs) while maintaining signal integrity. |
| Bus-hold current | ±75 to ±150 μA - actively retains logic state on floating inputs, eliminating need for 10 kΩ pull-up/down resistors. |
| IOFF leakage | ±100 μA at VCC = 0 V - prevents current flow into powered downstream circuits during hot-swap or partial power-down. |
| Operating temperature | –40 °C to +85 °C - qualified for industrial-grade embedded systems and base station control planes. |
Pinout & Package
74LVT245DB,118 is packaged in SOT339-1 (SSOP20), a 20-lead shrink small outline package with 0.65 mm pitch and 7.2 mm body width. Pin 1 is marked by a notch or dot; pin numbering follows standard counter-clockwise convention starting from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | LOW enables data flow A→B; HIGH enables B→A - synchronizes bidirectional bus arbitration without external logic. |
| 2–9 (A0–A7) | Port A data I/O | Octal bidirectional data terminals tied to local controller side - bus-hold active when unconnected. |
| 10 (GND) | Ground reference | 0 V return path for all internal logic and output drivers - must be low-inductance connection to minimize ground bounce. |
| 11–18 (B0–B7) | Port B data I/O | Octal bidirectional data terminals tied to remote bus side - tolerant to 5.5 V inputs regardless of VCC. |
| 19 (OE) | Output enable (active LOW) | Drives all A/B outputs to high-impedance when HIGH - enables multi-drop bus sharing and conflict-free arbitration. |
| 20 (VCC) | Supply voltage | 3.3 V core power - requires local 100 nF ceramic decoupling within 5 mm of pin to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Overvoltage-tolerant inputs | Withstands up to 5.5 V on A/B pins independent of VCC - eliminates level translators in mixed-voltage backplanes. |
| Bus-hold inputs | Maintains last-valid logic state on floating A/B pins - removes 16 external pull-up resistors in typical 8-bit interface designs. |
| IOFF partial power-down | Outputs disable safely when VCC = 0 V - enables live insertion/extraction without damaging powered system buses. |
| BiCMOS output stage | Combines bipolar speed and CMOS low static power - achieves <4 ns propagation with <0.2 mA ICC supply current (disabled). |
| TTL-compatible thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V at VCC = 2.7–3.6 V - interoperates directly with legacy 5 V TTL peripherals using only passive termination. |
Applications
| Industrial PLC Backplane Interface | FPGA I/O Expansion Bridge |
|---|---|
|
Use Scenario: Interfacing a 3.3 V FPGA I/O bank to legacy 5 V sensor modules and actuator drivers on a shared backplane. IC Role / Device Role / Timing Role: Bidirectional level-tolerant data transceiver managing read/write cycles between FPGA and peripheral registers under DIR-controlled timing. Use Value: Eliminates discrete level shifters and pull-up networks, reducing PCB area by 32 mm² and BOM cost by $0.38 per node while supporting 100+ kSPS sensor polling rates. |
Use Scenario: Extending limited FPGA GPIO count to drive 16-bit parallel LCD controller and SD card interface simultaneously. IC Role / Device Role / Timing Role: Octal bus repeater configured as two independent 4-bit channels (A0–A3 ↔ B0–B3 and A4–A7 ↔ B4–B7) with independent DIR/OE control. Use Value: Enables concurrent high-speed display updates and SD command transfers without bus contention, sustaining 25 MHz pixel clock timing margins. |
| Microcontroller Peripheral Multiplexer | Hot-Swappable Module Communication Hub |
|
Use Scenario: Sharing a single 3.3 V MCU's 8-bit data bus among multiple SPI flash, EEPROM, and ADC peripherals via software-controlled direction switching. IC Role / Device Role / Timing Role: Directionally gated bus buffer isolating peripherals during inactive cycles; OE asserts high-Z during SPI transactions to prevent loading. Use Value: Reduces MCU pin count requirement by 50%, avoids signal integrity degradation from stubs, and supports glitch-free peripheral switching at 10 kHz update rates. |
Use Scenario: Enabling field-replaceable compute modules in telecom line cards where daughterboards are inserted/removed while host remains powered. IC Role / Device Role / Timing Role: Isolation transceiver with IOFF protection ensuring no current flows from powered backplane into unpowered module during insertion. Use Value: Meets GR-63-CORE shock/vibration requirements for hot-swap; eliminates need for mechanical interlocks or sequenced power controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | Lower drive (+24 mA/–24 mA); 1.65–3.6 V supply; no bus-hold; no IOFF | Suitable for low-power, low-noise 3.3 V-only systems but requires external pull-ups and cannot tolerate 5 V inputs | Select when cost and static power are prioritized over mixed-voltage robustness and hot-swap capability |
| 74ALVC245MTCX | Higher speed (tPD = 2.5 ns typ), same 1.65–3.6 V range; no 5.5 V tolerance; no bus-hold | Better for high-frequency clock distribution but lacks overvoltage protection and bus-hold for floating inputs | Choose only if operating exclusively in clean 3.3 V domains with full bus termination and no risk of input overvoltage |
Compared with SN74LVC245APWR and 74ALVC245MTCX, the 74LVT245DB,118 uniquely combines 5.5 V input tolerance, bus-hold, and IOFF in a single octal transceiver - making it the sole option for industrial hot-swap and mixed-voltage backplane designs requiring zero external biasing and fail-safe power sequencing.
Availability
74LVT245DB,118 is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA I/O expansion bridges, and hot-swappable telecom modules requiring stable component supply, long-lifecycle assurance, and guaranteed traceability.
Supply support for 74LVT245DB,118 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
Nexperia is a global semiconductor expert focused on high-performance, reliable logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74LVT series delivers high-speed, 3.3 V–compatible logic with enhanced robustness for industrial backplane and mixed-voltage interface applications - emphasizing bus integrity, thermal stability, and long-term manufacturability.
FAQ
Can 74LVT245DB,118 operate with a 2.5 V supply?
No. The 74LVT245DB,118 is specified for 2.7 V to 3.6 V operation per JEDEC JESD8C. At 2.5 V, VIH minimum (2.0 V) and VOH performance fall outside guaranteed limits, risking setup/hold violations and reduced noise margin. Use 74LVC245 for true 2.5 V compatibility.
Does the bus-hold feature work when VCC = 0 V?
No. Bus-hold circuitry requires VCC to be powered and within specification (≥2.7 V) to maintain input state. When VCC = 0 V, inputs float freely unless externally biased; however, IOFF protection prevents back-current into powered systems during this condition.
What is the maximum capacitive load this transceiver can drive reliably?
Based on dynamic characteristics and output drive specs, the 74LVT245DB,118 reliably drives ≤50 pF total load (including trace and input capacitance) while maintaining <4 ns propagation delay and <10% overshoot. For >50 pF, series termination or reduced edge rate is recommended.
Is pin 10 (GND) electrically connected to the exposed pad in SSOP20 packages?
No. The SSOP20 (SOT339-1) package used for 74LVT245DB,118 has no thermal pad or exposed die attach paddle. Pin 10 is the sole GND connection; no additional thermal land or soldering is required or defined in the package outline.
74LVT245DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74LVT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
74LVT245DB,118 FAQ
1.How can I place an order for 74LVT245DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVT245DB,118 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 74LVT245DB,118 reliable?
The price and inventory of 74LVT245DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT245DB,118 is usually 5 days.
3.What payment methods are accepted for 74LVT245DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT245DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVT245DB,118?
74LVT245DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVT245DB,118 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 74LVT245DB,118?
For technical support, including 74LVT245DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT245DB,118 requirements.
6.How does Aetrix verify that 74LVT245DB,118 is sourced from the original manufacturer or authorized distributors?
All 74LVT245DB,118 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 74LVT245DB,118 meets industry standards.
7.What is the process for return or replacement of 74LVT245DB,118?
All 74LVT245DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT245DB,118, 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 74LVT245DB,118 part is unused and in its original packaging.
Return procedure for 74LVT245DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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