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NXP Semiconductors 74ABT126D,623
- Part No.:
- 74ABT126D,623
- Manufacturer:
- NXP Semiconductors
- Package:
- -
- Datasheet:
-
74ABT126D,623.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
74ABT126D,623 from Nexperia is a quad 3-state buffer/line driver with independent output enable inputs (1OE–4OE), designed for bidirectional bus interface and signal isolation in TTL-compatible digital systems. It operates from 4.5 V to 5.5 V, delivers ±64 mA output drive, features IOFF partial power-down protection, and supports live insertion/extraction in hot-swap applications.
For engineers reviewing the 74ABT126D,623 datasheet, 74ABT126D,623 pinout, 74ABT126D,623 application, or 74ABT126D,623 equivalent, key selection criteria include 3-state timing (tPZH ≤ 6.5 ns), IOFF-enabled backflow current suppression during power-down, SO14 package thermal and mechanical compatibility, and BiCMOS-level drive strength for legacy TTL bus loading.
Technical Context
The 74ABT126D implements four independent non-inverting buffers, each with dedicated active-low output enable control. Its BiCMOS architecture enables high-speed propagation (tPLH/tPHL ≤ 4.6 ns at 5 V) while maintaining TTL input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and robust output voltage levels (VOH ≥ 2.0 V at IOH = −32 mA).
IOFF circuitry actively disables outputs when VCC = 0 V, limiting backflow current to ±100 μA and enabling safe partial power-down operation. The device complies with JESD78 latch-up immunity (>500 mA) and JEDEC JS-001/JS-002 ESD standards (HBM >2000 V, CDM >1000 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL and CMOS logic rails without level-shifting. |
| Output Drive | +64 mA / −32 mA - drives heavy capacitive loads and multiple TTL inputs without signal degradation. |
| Propagation Delay | tPLH/tPHL ≤ 4.6 ns at 5 V - enables reliable operation in high-speed data buses up to ~200 MHz clock domains. |
| IOFF Leakage | ±100 μA at VCC = 0 V - prevents damaging back-current flow during hot-swap or partial system power-down. |
| Input Thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - guarantees direct interoperability with legacy 5 V TTL logic families. |
| ESD Rating | HBM >2000 V, CDM >1000 V - meets industrial handling requirements without additional board-level protection. |
| Operating Temp | −40 °C to +85 °C - supports deployment in extended-temperature industrial control and telecom infrastructure. |
Pinout & Package
74ABT126D,623 is housed in a plastic small outline package (SO14, SOT108-1) with 14 leads and 3.9 mm body width, optimized for surface-mount assembly and thermal dissipation in dense PCB layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | 1OE, 2OE, 3OE, 4OE | Active-low output enable controls - independently place each buffer output into high-impedance state for bus sharing. |
| 2, 5, 9, 12 | 1A, 2A, 3A, 4A | Data inputs - accept TTL-compatible logic levels and drive corresponding outputs when respective OE is LOW. |
| 3, 6, 8, 11 | 1Y, 2Y, 3Y, 4Y | Buffered non-inverting outputs - deliver rail-to-rail swing and high-current drive to downstream loads. |
| 7 | GND | Ground reference - common return path for all internal circuitry and output current sinks. |
| 14 | VCC | Positive supply - powers BiCMOS output stage and input buffers; IOFF remains active even if VCC = 0 V. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS Output Stage | Enables +64 mA sink / −32 mA source capability - eliminates need for external bus drivers in high-fanout systems. |
| IOFF Partial Power-Down | Blocks backflow current below ±100 μA when VCC = 0 V - allows safe hot-plug of daughterboards without system reset. |
| TTL-Compatible Inputs | VIH ≥ 2.0 V, VIL ≤ 0.8 V - interfaces directly with legacy 74LS/74F logic without level translation or pull-ups. |
| Live Insertion Support | Validated per JEDEC JESD78 - permits mechanical insertion/removal under power without latch-up or damage. |
| 3-State Timing Control | tPZH ≤ 6.5 ns, tPLZ ≤ 5.5 ns - ensures clean bus release and acquisition windows for synchronous multi-master arbitration. |
Applications
| Industrial PLC Backplane | Legacy Test Equipment Interface |
|---|---|
|
Use Scenario: Isolating microcontroller GPIOs from noisy 24 V I/O modules on a modular PLC rack backplane. IC Role / Device Role / Timing Role: Quad buffer provides galvanically isolated signal conditioning and fan-out amplification between controller and field-side drivers. Use Value: IOFF prevents backfeed from powered I/O modules into unpowered controller slots during hot-swap maintenance. |
Use Scenario: Adapting modern FPGA-based test pattern generators to legacy TTL-based DUT interface boards. IC Role / Device Role / Timing Role: Level-shifting and bus-driving buffer translates 3.3 V FPGA outputs to full 5 V TTL swing while driving 10+ LS loads. Use Value: BiCMOS output drive (+64 mA) maintains signal integrity across long ribbon cables with >100 pF capacitance. |
| Telecom Line Card Bus Arbiter | Automated Test Fixture Control |
|
Use Scenario: Managing shared address/data bus access among multiple DSPs and memory controllers on a line card. IC Role / Device Role / Timing Role: 3-state buffer acts as directional bus isolator, controlled by arbitration logic to prevent contention. Use Value: Sub-5 ns propagation delay and <6.5 ns enable/disable times ensure deterministic bus turnaround within 20 ns windows. |
Use Scenario: Controlling parallel relay banks and LED status indicators in an automated functional test fixture. IC Role / Device Role / Timing Role: Output-enable-controlled buffer sequences actuator activation while decoupling test controller from relay coil transients. Use Value: Independent OE pins allow staggered activation to limit inrush current and avoid brownout on shared 5 V rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT126N | PDIP-14 package; no IOFF; higher ICC (1.5 mA typical vs. 0.5 mA) | Lacks partial power-down support; unsuitable for hot-swap or mixed-voltage backplanes | Select only for through-hole prototyping where IOFF is not required. |
| 74LVC126APW | 3.3 V only (1.65–3.6 V); lower drive (±24 mA); no IOFF | Not TTL-compatible; requires level translation for 5 V systems; limited bus loading capability | Use only in pure 3.3 V LVC environments with light fan-out and no hot-swap. |
Compared with SN74ABT126N and 74LVC126APW, the 74ABT126D,623 uniquely combines 5 V TTL compatibility, IOFF-enabled hot-swap safety, and +64 mA drive - making it the sole choice for industrial backplane and legacy interface applications requiring robustness and interoperability.
Availability
74ABT126D,623 is available at Aetrix Electronics and suitable for industrial PLC backplanes, telecom line card bus arbitration, and legacy test equipment interface designs requiring stable component supply, long-term lifecycle assurance, and SO14 package compatibility.
Supply support for 74ABT126D,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
Nexperia is a global semiconductor expert delivering high-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74ABT series targets high-speed, TTL-compatible digital interfacing in industrial control and communications infrastructure, emphasizing robustness, hot-swap readiness, and legacy system integration.
FAQ
Does 74ABT126D,623 support mixed-voltage operation between 3.3 V and 5 V domains?
No. The 74ABT126D,623 is specified only for 4.5 V to 5.5 V VCC operation and TTL-level inputs. Its inputs are not 5 V-tolerant when powered from 3.3 V, and it lacks dual-supply or level-shifting capability. Interfacing with 3.3 V logic requires external translators or voltage clamping.
What is the maximum capacitive load the 74ABT126D,623 can drive while maintaining specified timing?
The device is characterized up to 50 pF load capacitance per output (per Fig. 7 test circuit). At 50 pF and 5 V supply, tPLH/tPHL remain ≤ 4.6 ns. Driving >50 pF increases propagation delay nonlinearly and may cause overshoot; for >100 pF loads, series termination or reduced edge rates are recommended.
Can all four buffers be enabled simultaneously without exceeding thermal limits?
Yes. With all outputs sourcing −32 mA or sinking +64 mA continuously, total power dissipation remains below 500 mW at 25 °C ambient. The SO14 package's Rth(j-a) of 110 K/W keeps junction temperature within 150 °C limit under worst-case static load, provided PCB copper area meets minimum 1 cm² thermal pad guidelines.
Is the 74ABT126D,623 qualified for automotive applications?
No. This part is not AEC-Q100 qualified and carries no automotive grade rating. Nexperia explicitly states in its legal disclaimers that non-automotive qualified products like the 74ABT126D,623 are unsuitable for safety-critical or life-support systems, including automotive ECUs, ADAS, or infotainment head units.
74ABT126D,623 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
74ABT126D,623 FAQ
1.How can I place an order for 74ABT126D,623 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT126D,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 74ABT126D,623 reliable?
The price and inventory of 74ABT126D,623 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT126D,623 is usually 5 days.
3.What payment methods are accepted for 74ABT126D,623?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT126D,623 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT126D,623?
74ABT126D,623 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT126D,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 74ABT126D,623?
For technical support, including 74ABT126D,623 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT126D,623 requirements.
6.How does Aetrix verify that 74ABT126D,623 is sourced from the original manufacturer or authorized distributors?
All 74ABT126D,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 74ABT126D,623 meets industry standards.
7.What is the process for return or replacement of 74ABT126D,623?
All 74ABT126D,623 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT126D,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 74ABT126D,623 part is unused and in its original packaging.
Return procedure for 74ABT126D,623:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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