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Nexperia USA Inc. 74LVCH245ADB,112
- Part No.:
- 74LVCH245ADB,112
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74LVCH245ADB,112.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,014
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Product details
Overview
74LVCH245ADB,112 from Nexperia is an octal 3-state bus transceiver with bidirectional data flow controlled by DIR and active-low OE inputs, operating from 1.2 V to 3.6 V supply, featuring bus hold on all data inputs, IOFF partial power-down protection, and 5.5 V overvoltage-tolerant inputs for mixed-voltage level translation between 3.3 V and 5 V systems in industrial control backplanes.
For engineers reviewing the 74LVCH245ADB,112 datasheet, 74LVCH245ADB,112 pinout, 74LVCH245ADB,112 application, or 74LVCH245ADB,112 equivalent, this device serves as a voltage-level agnostic bidirectional data bridge in FPGA-to-peripheral interfaces, microcontroller expansion buses, and legacy parallel port adapters where bus stability, low static current, and robust power-down behavior are required.
Technical Context
The 74LVCH245ADB,112 implements dual 8-bit bidirectional data paths with Schmitt-trigger inputs for noise immunity and monotonic transition tolerance. Its DIR input selects direction (A→B or B→A), while OE enables/disables all outputs into high-impedance state independently of direction.
IOFF circuitry actively disables outputs when VCC = 0 V, blocking reverse current flow during partial power-down sequences. Bus hold functionality maintains valid logic states on A0–A7 inputs without external pull resistors, reducing system component count and PCB area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.2 V to 3.6 V - supports single-rail operation across LVC/LVCH families and enables direct interface with 1.8 V, 2.5 V, and 3.3 V logic domains. |
| Input Voltage Tolerance | Up to 5.5 V - allows safe connection to 5 V signal sources without level-shifting circuitry in mixed-voltage systems. |
| Propagation Delay (VCC = 3.3 V) | Max 6.3 ns - ensures sub-10 ns timing margin for 50 MHz parallel bus operation with synchronous handshaking. |
| Bus Hold Current | ±75 μA at VI = 0.8 V / 2.0 V (VCC = 3.0 V) - provides sufficient drive to maintain stable logic levels under typical noise coupling conditions. |
| IOFF Leakage (VCC = 0 V) | ±20 μA max - limits backfeed current during hot-swap or staged power sequencing, protecting upstream drivers. |
| Operating Temperature | −40 °C to +125 °C - qualified for extended industrial and under-hood embedded applications without derating. |
| ESD Rating (HBM) | >2000 V - exceeds JEDEC JS-001 Class 2, enabling robust handling in manual assembly and field-replaceable modules. |
Pinout & Package
74LVCH245ADB,112 uses the SOT339-1 (SSOP20) package: plastic shrink small outline package, 20 leads, 0.65 mm pitch, body width 5.3 mm, 1.2 mm height - optimized for high-density PCB layouts with improved thermal dissipation over SO20.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | LOW routes data from A-side to B-side; HIGH routes from B-side to A-side - enables flexible bidirectional bus arbitration. |
| 2–9 (A0–A7) | Data I/O port A | Bus-hold enabled inputs/outputs - retain last valid logic state when un-driven, eliminating need for external pull-up/down resistors. |
| 10 (GND) | Ground reference | Primary return path for all internal logic and I/O currents; must be low-impedance connection to minimize ground bounce. |
| 11–18 (B0–B7) | Data I/O port B | Asymmetric I/O structure: B-side lacks bus hold but accepts 5.5 V tolerant inputs - suited for interfacing to legacy 5 V peripherals. |
| 19 (OE) | Output enable (active LOW) | Drives all A/B outputs to high-impedance when HIGH - essential for multi-drop bus sharing and conflict-free bus turnaround. |
| 20 (VCC) | Power supply | Single-supply rail powering core logic and I/O buffers; IOFF remains active even during VCC ramp-down or loss. |
Key Features
| Feature | Design Value |
|---|---|
| Bus hold on A-side inputs | Maintains stable logic states on A0–A7 without external biasing, reducing BOM count and layout complexity in microcontroller expansion designs. |
| IOFF partial power-down | Disables output drivers and blocks reverse current when VCC = 0 V, enabling safe insertion/removal in live backplane systems. |
| 5.5 V tolerant inputs | Accepts 5 V signals on all inputs while powered from 1.2–3.6 V rails - eliminates discrete level shifters in mixed-voltage communication links. |
| Schmitt-trigger inputs | Provides hysteresis (typ. 0.3 V) on all inputs, rejecting slow-rising/falling edges and improving noise immunity in electrically noisy environments. |
| JEDEC-compliant voltage ranges | Fully compliant with JESD8-7A (1.65–1.95 V), JESD8-5A (2.3–2.7 V), and JESD8-C/JESD36 (2.7–3.6 V) - guarantees interoperability across standard logic families. |
Applications
| Industrial PLC Backplane Interface | FPGA I/O Expansion Bridge |
|---|---|
|
Use Scenario: Connecting 3.3 V FPGA I/O banks to legacy 5 V sensor/actuator modules via parallel control bus. IC Role / Device Role / Timing Role: Bidirectional level translator and bus isolator, managing direction and tristate control under FPGA GPIO supervision. Use Value: Eliminates four discrete level shifters and eight pull resistors per channel, reducing board area by >35% and enabling deterministic 6.3 ns propagation delay. |
Use Scenario: Extending limited FPGA GPIO count to drive multiple peripheral ICs (ADCs, DACs, EEPROMs) on shared address/data bus. IC Role / Device Role / Timing Role: Octal bus buffer with bus hold, providing glitch-free bus turnaround and automatic signal retention during FPGA configuration cycles. Use Value: Prevents floating bus states during reconfiguration, avoiding spurious writes or reads; IOFF prevents backfeed during partial power-down of FPGA banks. |
| Microcontroller Parallel Port Adapter | Automated Test Equipment (ATE) Signal Router |
|
Use Scenario: Adding 8-bit parallel I/O capability to ARM Cortex-M MCUs lacking native parallel bus peripherals. IC Role / Device Role / Timing Role: Synchronous data transceiver synchronized to MCU's GPIO toggle rate, with DIR and OE driven by dedicated control pins. Use Value: Enables 10+ Mbps burst transfers using bit-banged software control; bus hold maintains output state during MCU interrupt latency windows. |
Use Scenario: Routing test signals between DUT interface connectors and pattern generator/analyzer channels in modular ATE racks. IC Role / Device Role / Timing Role: Reconfigurable signal path selector with fast enable/disable (max 11 ns tdis) and low skew (<1.5 ns) for timing-critical stimulus delivery. Use Value: Supports sub-10 ns timing margins for 100 MHz digital pattern generation; 5.5 V tolerance accommodates legacy DUTs with TTL-compatible signaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC245APW,118 | No bus hold on A-side inputs; identical pinout, supply range, and timing specs. | Requires external pull resistors on A-side when unused; less suitable for floating-bus scenarios. | Select when cost sensitivity outweighs bus hold requirement and external biasing is acceptable. |
| SN74LVC245APWR | Texas Instruments part; same logic function but different IOFF behavior - leakage spec not guaranteed at VCC = 0 V. | Lacks formal IOFF compliance per JEDEC JESD78; unsuitable for hot-swap or strict partial-power-down use cases. | Prefer only in TI-design ecosystems where cross-qualification and long-term supply are confirmed. |
Compared with 74LVCH245ADB,112, the 74LVC245APW,118 reduces system BOM cost but increases layout overhead, while SN74LVC245APWR offers vendor alignment at the expense of guaranteed power-off isolation - making the Nexperia LVCH variant optimal for robust, maintenance-sensitive industrial deployments.
Availability
74LVCH245ADB,112 is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA I/O expansion bridges, microcontroller parallel port adapters, and automated test equipment signal routing requiring stable component supply across extended temperature and mixed-voltage operation.
Supply support for 74LVCH245ADB,112 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 leading semiconductor manufacturer specializing in high-performance, energy-efficient logic, analog, and discrete components for automotive, industrial, and consumer applications.
The 74LVCH245ADB,112 belongs to Nexperia's LVC/LVCH logic family, engineered specifically for reliable voltage translation and bus integrity in space-constrained, thermally demanding embedded systems.
FAQ
Can 74LVCH245ADB,112 operate with VCC = 1.2 V while accepting 5 V inputs?
Yes. The device supports 1.2 V to 3.6 V VCC operation and tolerates up to 5.5 V on all inputs regardless of supply voltage. This allows safe interfacing of 5 V peripherals to ultra-low-voltage controllers without external level shifters, provided output loading remains within 24 mA per pin at 1.2 V.
What is the functional difference between DIR = LOW and DIR = HIGH?
When DIR = LOW, data flows from A-side (pins 2–9) to B-side (pins 11–18); when DIR = HIGH, data flows from B-side to A-side. This bidirectional control enables single-transceiver implementation of full-duplex parallel buses, reducing component count versus unidirectional solutions.
Does bus hold apply to both A-side and B-side inputs?
No. Bus hold is implemented only on A0–A7 (pins 2–9). B0–B7 (pins 11–18) lack bus hold but retain 5.5 V input tolerance. This asymmetry allows A-side to serve as stable controller interface while B-side connects to externally biased legacy peripherals.
How does IOFF behave during power sequencing?
IOFF activates automatically when VCC drops below ~0.8 V, forcing all outputs into high-impedance and blocking reverse current flow from powered B-side lines into the unpowered device. This protects upstream drivers during staggered power-up/down in modular systems.
74LVCH245ADB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74LVCH
- Package/Case:
- 20-SSOP (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:
- 24mA, 24mA
- Voltage - Supply:
- 1.2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
74LVCH245ADB,112 FAQ
1.How can I place an order for 74LVCH245ADB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVCH245ADB,112 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 74LVCH245ADB,112 reliable?
The price and inventory of 74LVCH245ADB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVCH245ADB,112 is usually 5 days.
3.What payment methods are accepted for 74LVCH245ADB,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVCH245ADB,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVCH245ADB,112?
74LVCH245ADB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVCH245ADB,112 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 74LVCH245ADB,112?
For technical support, including 74LVCH245ADB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVCH245ADB,112 requirements.
6.How does Aetrix verify that 74LVCH245ADB,112 is sourced from the original manufacturer or authorized distributors?
All 74LVCH245ADB,112 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 74LVCH245ADB,112 meets industry standards.
7.What is the process for return or replacement of 74LVCH245ADB,112?
All 74LVCH245ADB,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVCH245ADB,112, 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 74LVCH245ADB,112 part is unused and in its original packaging.
Return procedure for 74LVCH245ADB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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