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Nexperia USA Inc. 74ABT245D,602
- Part No.:
- 74ABT245D,602
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74ABT245D,602.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,434
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Product details
Overview
74ABT245D,602 from Nexperia is an octal bidirectional 3-state transceiver with independent direction (DIR) and output enable (OE) control, operating at 4.5–5.5 V. It provides ±64 mA/–32 mA drive strength, supports partial power-down via IOFF circuitry, and is rated for –40 °C to +85 °C operation in SO20 (SOT163-1) package. It interfaces TTL-level buses in industrial control backplanes.
For engineers reviewing the 74ABT245D,602 datasheet, 74ABT245D,602 pinout, 74ABT245D,602 application, or 74ABT245D,602 equivalent, this page delivers verified functional behavior, static/dynamic timing specs, thermal-safe IOFF operation, and real-world bus interface use cases - all confirmed against Nexperia's Rev. 6 product data sheet (24 June 2024).
Technical Context
The 74ABT245D implements BiCMOS logic architecture to achieve high-speed propagation (tPLH/tPHL ≤ 4.6 ns at 5.0 V) while maintaining TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and robust output drive. Its dual-control logic (DIR + OE) enables deterministic bidirectional data flow between two 8-bit buses without bus contention.
IOFF circuitry actively disables outputs when VCC = 0 V, limiting backflow current to ±100 μA and enabling live insertion/extraction. The device meets JESD78 Class II latch-up immunity (>500 mA) and ESD protection per JS-001 (HBM >2000 V) and JS-002 (CDM >1000 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5–5.5 V - ensures compatibility with legacy 5 V TTL and CMOS systems without level-shifting. |
| Propagation delay | tPLH/tPHL ≤ 4.6 ns - enables reliable operation in high-speed bus arbitration up to ~200 MHz clock-equivalent systems. |
| Output drive | +64 mA / –32 mA - drives heavy capacitive loads (e.g., 50 pF traces + multiple inputs) while maintaining VOL ≤ 0.55 V and VOH ≥ 2.0 V. |
| IOFF leakage | ±100 μA at VCC = 0 V - prevents damaging backfeed current during hot-swap or partial system power-down. |
| Operating temperature | –40 °C to +85 °C - validated for industrial control cabinets and factory automation environments. |
| Input clamping voltage | VIK ≤ –1.2 V - protects inputs from negative transients common in relay-driven I/O subsystems. |
| ESD rating | HBM >2000 V, CDM >1000 V - withstands handling and board-level electrostatic events without functional degradation. |
Pinout & Package
74ABT245D,602 is supplied in SO20 plastic small outline package (SOT163-1), 20-pin, 7.5 mm body width, with standard 1.27 mm pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | LOW enables A→B data flow; HIGH enables B→A - decouples bus direction from enable state for flexible protocol handling. |
| 2–9 (A0–A7) | Port A data I/O | Bidirectional TTL-compatible pins tied to one bus segment; high-impedance when OE = HIGH. |
| 10 (GND) | Ground reference | 0 V return path for all internal logic and output drivers; requires low-inductance PCB connection. |
| 11–18 (B0–B7) | Port B data I/O | Bidirectional TTL-compatible pins tied to second bus segment; isolated from A-side when OE = HIGH. |
| 19 (OE) | Output enable (active LOW) | Drives both A and B ports into high-Z simultaneously - essential for bus arbitration and multi-master conflict avoidance. |
| 20 (VCC) | Positive supply | 4.5–5.5 V power rail; IOFF circuitry remains active even during full VCC ramp-down or loss. |
Key Features
| Feature | Design Value |
|---|---|
| Octal bidirectional bus interface | Simultaneous 8-bit data transfer in either direction with single DIR pin - eliminates need for separate transmit/receive buffers. |
| IOFF partial power-down | Outputs disable safely at VCC = 0 V, limiting reverse current to ±100 μA - enables hot-plug capability in modular backplane systems. |
| Live insertion/extraction support | Validated mechanical and electrical tolerance for board-level replacement without system shutdown - critical for field-serviceable PLC modules. |
| TTL-level direct interface | VIH = 2.0 V min, VIL = 0.8 V max - interoperates with legacy 5 V microcontrollers, FPGAs, and ASICs without external level shifters. |
| Latch-up immunity | Exceeds 500 mA per JESD78 Class II - survives transient overcurrent events in noisy industrial power environments. |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
|
Use Scenario: Connecting a modern ARM-based controller module to an existing 8-bit ISA-style backplane carrying sensor and actuator signals. IC Role / Device Role / Timing Role: Bidirectional data bridge between mismatched voltage domains and timing protocols, with DIR managing master/slave handshaking and OE enabling bus arbitration. Use Value: Eliminates need for discrete level shifters and direction logic; IOFF prevents backfeed when controller module is powered off mid-operation. |
Use Scenario: Extending a vintage 8051-based test equipment mainframe with additional peripheral slots using identical 5 V TTL signaling. IC Role / Device Role / Timing Role: High-drive 3-state buffer isolating expansion bus segments during hot-add of new cards, synchronized by shared OE control. Use Value: Delivers +64 mA sink current to drive long traces and multiple TTL inputs while maintaining tPLH ≤ 4.6 ns for cycle-accurate timing. |
| Programmable Logic I/O Expansion | Factory Automation Data Hub |
|
Use Scenario: Adding parallel I/O capability to a Xilinx Spartan FPGA design where native I/O pins are exhausted but 5 V tolerant banks remain available. IC Role / Device Role / Timing Role: Off-chip bidirectional data register with DIR-controlled flow and OE-gated tristate - mapped as memory-mapped peripheral in firmware. Use Value: Provides deterministic 8-bit read/write latency (≤4.6 ns) and ±32 mA sourcing/sinking - sufficient for driving LED arrays, relays, or optocouplers directly. |
Use Scenario: Centralized data aggregation node in a PLC rack that routes sensor readings from multiple I/O modules to a main CPU via shared 5 V data bus. IC Role / Device Role / Timing Role: Isolation transceiver on each module's local bus, with OE controlled by rack-level arbitration logic to prevent bus contention. Use Value: IOFF protection ensures safe module removal while rack remains powered; HBM >2000 V ESD rating withstands factory floor static discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245N | DIP-20 package only; no IOFF circuitry; wider VCC range (4.5–5.5 V same); slightly higher ICC (max 250 μA vs 150 μA) | Not suitable for hot-swap or partial power-down systems; limited to through-hole prototyping or legacy DIP sockets. | Select only for breadboard validation or non-hot-plug fixed installations where SO20 footprint is unavailable. |
| 74LVC245APW | 3.3 V only (1.65–3.6 V); lower drive (±24 mA); no IOFF; TSSOP20 (SOT360-1) package | Requires level translation for 5 V systems; unsuitable for industrial backplanes with mixed-voltage legacy components. | Choose only for new 3.3 V designs prioritizing low power and space savings - not a drop-in replacement for 74ABT245D,602. |
Compared with SN74ABT245N and 74LVC245APW, the 74ABT245D,602 uniquely combines 5 V TTL compatibility, SO20 surface-mount reliability, and certified IOFF protection - making it the sole option for industrial hot-swap backplanes requiring guaranteed zero-backfeed during maintenance.
Availability
74ABT245D,602 is available at Aetrix Electronics and suitable for industrial control backplanes, legacy system bus extension, programmable logic I/O expansion, and factory automation data hubs requiring stable component supply across extended production lifecycles.
Supply support for 74ABT245D,602 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, high-reliability logic, analog, and discrete components optimized for industrial, automotive, and computing applications.
The 74ABT series targets robust 5 V TTL-compatible bus interfacing in harsh environments, emphasizing live insertion safety, latch-up immunity, and precise timing - specifically engineered for industrial control and legacy system integration.
FAQ
Can 74ABT245D,602 operate with VCC = 4.5 V while maintaining full output drive?
Yes. At VCC = 4.5 V, the device guarantees VOL ≤ 0.55 V at IOL = 64 mA and VOH ≥ 2.0 V at IOH = –32 mA, per Table 6 of the Rev. 6 datasheet. This ensures reliable logic-low and logic-high levels across its full specified temperature range (–40 °C to +85 °C), critical for noise margin in industrial bus systems.
What is the maximum capacitive load the 74ABT245D,602 can drive while staying within propagation delay specs?
The dynamic characteristics (Table 7) are characterized with CL = 50 pF, matching typical PCB trace + input capacitance of multiple TTL loads. At this load, tPLH/tPHL remains ≤ 4.6 ns. Driving >50 pF increases delay nonlinearly and may exceed timing budgets - use series termination or reduce fanout if total load exceeds 50 pF.
Does the IOFF feature require external biasing or configuration?
No. IOFF is fully internal and automatic: when VCC drops to 0 V, output transistors are disabled regardless of DIR or OE state, limiting backflow current to ±100 μA (Table 6). No external resistors, pull-ups, or configuration bits are needed - it functions passively during power loss or hot removal.
How does the 74ABT245D,602 handle simultaneous assertion of DIR and OE?
When OE = HIGH (disabled), both A and B ports enter high-impedance state regardless of DIR value - direction control is irrelevant. DIR only affects data flow when OE = LOW. This priority logic prevents bus contention and simplifies arbitration logic in multi-master systems.
74ABT245D,602 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74ABT
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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-SO
74ABT245D,602 FAQ
1.How can I place an order for 74ABT245D,602 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT245D,602 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 74ABT245D,602 reliable?
The price and inventory of 74ABT245D,602 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT245D,602 is usually 5 days.
3.What payment methods are accepted for 74ABT245D,602?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT245D,602 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT245D,602?
74ABT245D,602 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT245D,602 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 74ABT245D,602?
For technical support, including 74ABT245D,602 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT245D,602 requirements.
6.How does Aetrix verify that 74ABT245D,602 is sourced from the original manufacturer or authorized distributors?
All 74ABT245D,602 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 74ABT245D,602 meets industry standards.
7.What is the process for return or replacement of 74ABT245D,602?
All 74ABT245D,602 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT245D,602, 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 74ABT245D,602 part is unused and in its original packaging.
Return procedure for 74ABT245D,602:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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