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NXP Semiconductors 74ABT623D,623
- Part No.:
- 74ABT623D,623
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74ABT623D,623.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,987
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Product details
Overview
74ABT623D,623 from NXP Semiconductors is an octal bidirectional bus transceiver with dual non-inverting 3-state outputs, designed for asynchronous two-way communication between data buses. It features ±32 mA/±64 mA output drive, 2.6 ns typical propagation delay (A↔B), and operates across −40 °C to +85 °C in SO20 package. It enables isolated bus coupling in industrial control backplanes.
For engineers reviewing the 74ABT623D,623 datasheet, 74ABT623D,623 pinout, 74ABT623D,623 application, or 74ABT623D,623 equivalent, key selection criteria include dual enable logic (OEAB active-HIGH, OEBA active-LOW), bus-isolation capability during 3-state mode, and BiCMOS-level drive strength compatible with TTL/CMOS loads.
Technical Context
The 74ABT623D,623 implements a dual-control transceiver architecture where simultaneous assertion of OEAB (pin 1) and OEBA (pin 19) places the device in transparent latch mode-reinforcing A- and B-bus states without external feedback. Its BiCMOS process delivers low static current (250 µA max ICC) while sustaining 64 mA sink capability per output.
Timing behavior is defined by six distinct propagation paths: tPLH/tPHL (data path), and tPZH/tPHZ/tPZL/tPLZ (enable-controlled transitions), all specified down to 1.0 ns min and 7.5 ns max over full temperature range. Input transition rate is limited to 10 ns/V to ensure reliable switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL systems and rejects supply noise up to ±0.5 V |
| Propagation delay (A↔B) | 2.6 ns typ - supports >300 MHz bus toggle rates in point-to-point configurations |
| Output drive (sink/source) | 64 mA / −32 mA - drives heavy capacitive loads (e.g., 15+ TTL inputs) without signal degradation |
| Input voltage thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - provides 0.7 V noise margin against 5 V logic levels |
| 3-state leakage (IOZ) | ±50 µA max - prevents bus contention when multiple transceivers share a common line |
| Operating temperature | −40 °C to +85 °C - qualified for industrial-grade embedded control and instrumentation environments |
| ESD protection | HBM >2000 V, MM >200 V - withstands handling and board-level ESD events without latch-up |
Pinout & Package
74ABT623D,623 is housed 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 (OEAB) | Active-HIGH output enable | Enables A→B transmission when HIGH; disables both directions when LOW |
| 2–9 (A0–A7) | Bidirectional data port A | Connects to local bus; functions as input or output depending on OEAB/OEBA state |
| 10 (GND) | Ground reference | Primary return path for all I/O and supply currents; must be low-impedance |
| 11–18 (B0–B7) | Bidirectional data port B | Connects to remote bus; mirrors A-port state when enabled in either direction |
| 19 (OEBA) | Active-LOW output enable | Enables B→A transmission when LOW; disables both directions when HIGH |
| 20 (VCC) | Positive supply | 5 V nominal power rail; requires local 100 nF decoupling adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent enable control | OEAB (active-HIGH) and OEBA (active-LOW) allow asymmetric bus arbitration and deadlock-free handshaking |
| Power-up 3-state | Outputs remain high-impedance until VCC stabilizes above 2.0 V - prevents spurious bus loading at power-on |
| Latch-up immunity | Exceeds 500 mA per JESD78B Class II Level A - survives transient ground bounce or supply reversal |
| Bus-hold on data pins | Not present - inputs float to undefined state in 3-state; external pull-ups required for deterministic idle |
| BiCMOS speed-power balance | Combines bipolar saturation speed with CMOS low static dissipation - 250 µA ICC max at 5.5 V |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
Use Scenario: Connecting microcontroller subsystems to distributed I/O modules via shared 8-bit parallel bus. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver isolating CPU bus from field-side peripherals during fault conditions. Use Value: Dual enable logic permits independent control of upstream/downstream traffic, eliminating bus contention during hot-swap events. | Use Scenario: Extending ISA or PC/104 bus signals across a 150 mm PCB span with signal integrity preservation. IC Role / Device Role / Timing Role: High-drive buffer maintaining edge rate and voltage margins across long traces. Use Value: 64 mA sink capability sustains logic-low voltage under 50 pF load + 10 cm trace, avoiding timing skew. |
| Test Equipment Data Path Switching | Modular PLC Communication Hub |
Use Scenario: Routing DUT data between multiple instrument channels in automated test fixtures. IC Role / Device Role / Timing Role: Directionally reconfigurable bus switch enabling one-shot capture or loopback diagnostics. Use Value: Simultaneous OEAB/OEBA assertion locks bus state for glitch-free sampling without external latches. | Use Scenario: Interfacing CPU module to interchangeable I/O carrier boards in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Isolation barrier preventing ground-loop noise propagation between modules. Use Value: 3-state isolation during firmware update prevents corrupted register reads on live backplane. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245DBR | Single-directional enable (OE only); no OEBA pin; identical SO20 footprint and drive specs | Lacks bidirectional arbitration - requires external logic for A↔B handshaking | Select when system uses master-slave protocol with fixed data flow direction |
| 74LVT245PW | 3.3 V only supply (2.7–3.6 V); lower drive (±32 mA); TSSOP20 package | Not 5 V tolerant; incompatible with legacy 5 V buses without level translation | Select for new 3.3 V designs prioritizing lower power and smaller footprint |
Compared with SN74ABT245DBR and 74LVT245PW, the 74ABT623D,623 uniquely supports true bidirectional arbitration via dual enables-enabling self-contained bus storage and contention-free switching without added logic, critical for modular industrial backplanes.
Availability
74ABT623D,623 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy bus extensions, and modular PLC communication hubs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74ABT623D,623 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The 74ABT623D,623 belongs to NXP's ABT-series advanced BiCMOS logic family, engineered for high-speed, high-drive 5 V bus interfacing in noise-sensitive industrial control systems.
FAQ
What is the function of pin 19 (OEBA) on the 74ABT623D,623?
Pin 19 (OEBA) is the active-LOW output enable for B→A data transmission. When OEBA is LOW and OEAB is HIGH, data flows from B-bus to A-bus. When both OEAB and OEBA are asserted (OEAB=HIGH, OEBA=LOW), the 74ABT623D,623 enters transparent latch mode, holding prior bus states. This dual-enable scheme eliminates need for external direction control logic in the 74ABT623D,623.
Does the 74ABT623D,623 support hot insertion into a live 5 V bus?
Yes - the 74ABT623D,623 features power-up 3-state behavior: outputs remain high-impedance until VCC exceeds 2.0 V, preventing bus contention during power ramp. Combined with ±100 µA IOFF (power-off leakage) and 500 mA latch-up immunity, the 74ABT623D,623 safely enters or exits a powered bus without disrupting adjacent devices.
Can the 74ABT623D,623 replace a 74LS245 in existing designs?
Yes, with qualification: the 74ABT623D,623 shares pinout compatibility with 74LS245 in SO20, but offers higher drive (64 mA vs. 24 mA), faster propagation (2.6 ns vs. 10 ns), and dual-enable control. Verify that OEBA logic inversion (active-LOW) aligns with existing control signals; if not, invert OEBA externally. The 74ABT623D,623 improves timing margin and noise immunity in the same footprint.
What is the maximum capacitive load the 74ABT623D,623 can drive while maintaining 4.1 ns max tPLH?
The 74ABT623D,623 maintains its 4.1 ns max tPLH (25 °C, VCC = 5.0 V) up to 50 pF total load capacitance, as validated in the official test circuit (Figure 9, CL = 50 pF). Beyond 50 pF, propagation delay increases linearly; for 100 pF loads, expect ~6.5 ns typical. Always use local 100 nF VCC decoupling to sustain performance in the 74ABT623D,623.
Is the 74ABT623D,623 RoHS compliant and halogen-free?
Yes - the 74ABT623D,623 manufactured in SO20 (SOT163-1) package meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. Lead finish is matte tin, and molding compound complies with JEDEC JS709A. Full compliance documentation is available under NXP product number 74ABT623D,623 in the official NXP quality portal.
74ABT623D,623 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74ABT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- 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:
- 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
74ABT623D,623 FAQ
1.How can I place an order for 74ABT623D,623 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT623D,623 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 74ABT623D,623 reliable?
The price and inventory of 74ABT623D,623 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT623D,623 is usually 5 days.
3.What payment methods are accepted for 74ABT623D,623?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT623D,623 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT623D,623?
74ABT623D,623 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT623D,623 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 74ABT623D,623?
For technical support, including 74ABT623D,623 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT623D,623 requirements.
6.How does Aetrix verify that 74ABT623D,623 is sourced from the original manufacturer or authorized distributors?
All 74ABT623D,623 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 74ABT623D,623 meets industry standards.
7.What is the process for return or replacement of 74ABT623D,623?
All 74ABT623D,623 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT623D,623, 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 74ABT623D,623 part is unused and in its original packaging.
Return procedure for 74ABT623D,623:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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