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Nexperia USA Inc. 74ABT245DB,112
- Part No.:
- 74ABT245DB,112
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74ABT245DB,112.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,015
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Product details
Overview
74ABT245DB,112 from Nexperia is an octal bidirectional 3-state transceiver with independent direction (DIR) and output enable (OE) controls, operating at 4.5–5.5 V. It provides ±64 mA/–32 mA drive capability, IOFF partial power-down protection, and supports live insertion in bus interface applications such as industrial backplanes and legacy TTL-compatible data paths.
For engineers reviewing the 74ABT245DB,112 datasheet, 74ABT245DB,112 pinout, 74ABT245DB,112 application, or 74ABT245DB,112 equivalent, key selection criteria include bidirectional bus timing (tPLH/tPHL ≤ 4.6 ns), IOFF leakage (±100 µA at VCC = 0 V), thermal range (–40 °C to +85 °C), and SO20 package compatibility with legacy PCB footprints.
Technical Context
The 74ABT245DB,112 implements a BiCMOS-based octal transceiver architecture with separate DIR and active-low OE inputs enabling precise control of data flow direction and output state. Its IOFF circuitry actively disables outputs during power-down, preventing backflow current when VCC = 0 V.
Functionally, it operates in three modes: A→B (DIR = HIGH, OE = LOW), B→A (DIR = LOW, OE = LOW), or high-impedance (OE = HIGH). Propagation delays are symmetric for both directions (tPLH/tPHL typ. 2.2–2.9 ns), and 3-state transition times (tPZH/tPLZ ≤ 5.3 ns) ensure clean bus arbitration in multiplexed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5–5.5 V - compatible with standard 5 V TTL and CMOS logic rails without level-shifting. |
| Drive Strength | +64 mA / –32 mA - sufficient to drive 50 Ω transmission lines or multiple TTL loads directly. |
| Propagation Delay | tPLH/tPHL ≤ 4.6 ns @ VCC = 5.0 V - enables reliable operation in 100+ MHz bus systems with tight timing margins. |
| IOFF Leakage | ±100 µA @ VCC = 0 V - prevents damaging back-current during hot-swap or partial power-down sequences. |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial environments including factory automation and telecom infrastructure. |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - meets JEDEC JS-001/JS-002 Class 2/C3 for robust handling in manufacturing and field service. |
| Input Clamping Voltage | VIK = –1.2 V - protects inputs against negative transients up to –1.2 V without external diodes. |
Pinout & Package
74ABT245DB,112 is supplied in SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | HIGH selects A→B data flow; LOW selects B→A - enables full-duplex bus arbitration with single control line. |
| 2–9 (A0–A7) | Port A I/O terminals | Bidirectional data pins on side A; internally isolated during 3-state mode when OE = HIGH. |
| 10 (GND) | Ground reference | Primary return path for all I/O and supply currents; requires low-inductance PCB connection. |
| 11–18 (B0–B7) | Port B I/O terminals | Bidirectional data pins on side B; electrically identical to A-side with matched timing and drive. |
| 19 (OE) | Active-low output enable | Drives all outputs to high-impedance when HIGH - essential for bus sharing and multi-drop configurations. |
| 20 (VCC) | Positive supply | Must be decoupled locally with ≥100 nF ceramic capacitor to suppress switching noise and maintain rail stability. |
Key Features
| Feature | Design Value |
|---|---|
| Octal bidirectional bus interface | Simultaneous 8-bit data transfer in either direction controlled by one DIR pin - reduces control logic overhead vs. discrete buffers. |
| IOFF partial power-down | Outputs disabled and leakage limited to ±100 µA when VCC = 0 V - enables safe hot-plug in modular backplane systems. |
| Power-up 3-state | Outputs remain in high-impedance until VCC stabilizes above 2.0 V - prevents bus contention during power sequencing. |
| TTL-level input compatibility | VIL ≤ 0.8 V, VIH ≥ 2.0 V - interfaces directly with legacy 5 V TTL without level translators or pull-ups. |
| Latch-up immunity | Exceeds 500 mA per JESD78 Class II Level A - ensures robustness against transient overcurrent events in noisy industrial settings. |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
Use Scenario: Interfacing microcontroller peripherals to a shared 8-bit ISA-style backplane with multiple slot devices. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing data flow between CPU address/data bus and peripheral cards under DIR-controlled direction and OE-gated arbitration. Use Value: Eliminates need for dual unidirectional buffers and reduces PCB real estate while maintaining <4.6 ns propagation delay for cycle-accurate timing. | Use Scenario: Extending a vintage 8051-based control system's data bus to add new sensor acquisition modules without redesigning the main board. IC Role / Device Role / Timing Role: Level-translating and isolating legacy TTL bus segments while preserving signal integrity and timing margins across added trace length. Use Value: Direct TTL compatibility and ±64 mA drive overcome capacitive loading from extended traces, avoiding timing skew or signal degradation. |
| Hot-Swappable Module Interface | Test Equipment Signal Routing |
Use Scenario: Enabling live insertion/extraction of functional modules in programmable logic controller (PLC) carrier boards. IC Role / Device Role / Timing Role: Isolating module-local bus from main system bus using IOFF protection during power-up/down transitions. Use Value: IOFF circuitry limits back-current to ±100 µA when module is unpowered, preventing damage to host controller or adjacent modules. | Use Scenario: Routing DUT signals between multiple test instruments (oscilloscope, logic analyzer, pattern generator) in automated test fixtures. IC Role / Device Role / Timing Role: Bidirectional signal switch enabling flexible path reconfiguration via DIR/OE control without mechanical relays. Use Value: Sub-5 ns propagation delay and matched A/B timing ensure deterministic signal routing with minimal jitter or skew across test channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVT245PW,118 | Lower supply range (2.7–3.6 V); 3.3 V only; 32 mA drive; faster tPLH (1.8 ns typ.) | Designed for 3.3 V systems; not 5 V tolerant; unsuitable for mixed-voltage or legacy 5 V buses. | Select only for new 3.3 V designs requiring lower power and higher speed; incompatible with 5 V logic families. |
| SN74ABT245N | DIP20 package (discontinued per Nexperia v.2 revision); identical electrical specs but through-hole mounting | Used in prototyping or legacy repair where SO20 footprint is unavailable; no production support after 1998. | Choose only for hand-soldered lab builds or replacement of obsolete DIP sockets; not recommended for volume SMT production. |
Compared with 74ABT245DB,112, the 74LVT245PW,118 offers superior speed and lower voltage operation but sacrifices 5 V compatibility and bus drive strength, while the SN74ABT245N retains full electrical equivalence but lacks modern packaging and supply chain support.
Availability
74ABT245DB,112 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extensions, hot-swappable PLC modules, and automated test equipment signal routing requiring stable component supply across long-lifecycle programs.
Supply support for 74ABT245DB,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 global semiconductor expert delivering high-performance, reliable logic, analog, and MOSFET solutions with focus on efficiency, reliability, and sustainability.
The 74ABT series targets high-speed, 5 V TTL-compatible bus interface applications demanding robust drive strength, precise timing, and industrial-grade reliability in harsh environments.
FAQ
What is the maximum clock frequency supported by 74ABT245DB,112?
The 74ABT245DB,112 does not operate on a clock signal-it is an asynchronous transceiver. Its usable data rate is determined by propagation delay (≤4.6 ns) and system setup/hold timing. In practice, it reliably supports bidirectional bus transfers up to 100–120 MHz in well-designed PCB layouts with controlled impedance and proper termination.
Can 74ABT245DB,112 interface directly with 3.3 V logic?
No-74ABT245DB,112 is a 5 V-only device with VIH = 2.0 V minimum and VIL = 0.8 V maximum, but its outputs swing rail-to-rail (0 V to VCC ≈ 5 V). Direct connection to 3.3 V inputs risks overvoltage damage. A level-shifter or series resistor + clamp diode network is required for safe interfacing.
Does 74ABT245DB,112 support power-down isolation when VCC is disconnected?
Yes-the integrated IOFF circuitry actively disables outputs and limits leakage to ±100 µA when VCC = 0 V, preventing back-current flow from live bus lines into the unpowered device. This feature is verified per JESD78 and enables safe hot-swap operation in modular systems.
Is the SO20 package (SOT163-1) RoHS compliant and lead-free?
Yes-74ABT245DB,112 in SO20 (SOT163-1) packaging is RoHS compliant and lead-free, meeting EU Directive 2011/65/EU and Nexperia's environmental standards. The device carries the "Pb-free" marking and is qualified for lead-free reflow soldering per JEDEC J-STD-020.
74ABT245DB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74ABT
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
74ABT245DB,112 FAQ
1.How can I place an order for 74ABT245DB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT245DB,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 74ABT245DB,112 reliable?
The price and inventory of 74ABT245DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT245DB,112 is usually 5 days.
3.What payment methods are accepted for 74ABT245DB,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT245DB,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT245DB,112?
74ABT245DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT245DB,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 74ABT245DB,112?
For technical support, including 74ABT245DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT245DB,112 requirements.
6.How does Aetrix verify that 74ABT245DB,112 is sourced from the original manufacturer or authorized distributors?
All 74ABT245DB,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 74ABT245DB,112 meets industry standards.
7.What is the process for return or replacement of 74ABT245DB,112?
All 74ABT245DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT245DB,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 74ABT245DB,112 part is unused and in its original packaging.
Return procedure for 74ABT245DB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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