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onsemi 74ABT126CSJ
- Part No.:
- 74ABT126CSJ
- Manufacturer:
- onsemi
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74ABT126CSJ.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,958
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Product details
Overview
74ABT126CSJ from Fairchild Semiconductor is a quad non-inverting buffer IC with 3-STATE outputs, designed for bus interface and data isolation in 5V TTL-compatible systems. It delivers 32mA output source and 64mA sink capability, operates from 4.5V to 5.5V, and features glitch-free high-impedance control during power-up/down - used in industrial backplane drivers and memory address buffering.
For engineers reviewing the 74ABT126CSJ datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed latchup protection, sub-7ns enable/disable timing asymmetry (tPZH > tPHZ), hot-insertion tolerance, and EIAJ TYPE II SOP-14 package compatibility with JEDEC MO-153 footprint variants.
Technical Context
The 74ABT126CSJ implements four independent ABT-series buffered drivers with active-high 3-STATE control per channel. Its logic architecture ensures no bus contention via disable time (tPHZ ≤ 5.8ns) strictly less than enable time (tPZH ≤ 6.5ns) across –40°C to +85°C.
It supports nondestructive hot insertion and maintains high-impedance integrity during full VCC ramp (–0.5V to +7.0V absolute max), with input clamp diodes rated to –1.2V and output short-circuit current up to –275mA - critical for legacy 5V system bus arbitration and level-shifting interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | +4.5V to +5.5V - ensures compatibility with standard 5V TTL and CMOS logic rails |
| IOH / IOL | –32mA / +64mA - drives heavy capacitive loads and multiple TTL inputs without external buffers |
| tPLH / tPHL | 1.0ns to 4.6ns - enables high-speed data routing in 100+ MHz bus environments |
| tPZH / tPHZ | 1.0ns to 6.5ns / 1.0ns to 5.8ns - prevents bus contention by ensuring disable precedes enable |
| VIL / VIH | 0.8V / 2.0V - guarantees robust noise margin against 5V TTL input thresholds |
| ICCZ | 50µA - ultra-low quiescent current when all outputs disabled, reducing standby power |
Pinout & Package
EIAJ TYPE II 14-pin Small Outline Package (SOP), 5.3mm body width, gull-wing leads, JEDEC-compliant footprint with 0.65mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Data Input (A1–A4) | Non-inverting logic inputs driving respective output buffers |
| 2, 5, 11, 14 | Output Enable (OE1–OE4) | Active-HIGH enables 3-STATE output; tied low disables all outputs |
| 3, 6, 12, 9 | Data Output (Y1–Y4) | Buffered non-inverting outputs with 3-STATE control |
| 7 | GND | Ground reference for all logic and power domains |
| 14 | VCC | +4.5V to +5.5V supply rail powering internal logic and output stages |
Key Features
| Feature | Design Value |
|---|---|
| Glitch-free 3-STATE transition | Maintains high-impedance state throughout full VCC ramp (power-up/down), preventing bus corruption |
| Hot-insertion tolerance | Nondestructive operation when inserted into live 5V backplanes - no latchup or damage at VCC = 0V |
| Bus contention prevention | Asymmetric timing (tPHZ < tPZH) ensures outputs fully disable before new drivers activate |
| Latchup immunity | Guaranteed protection per JEDEC JESD78, surviving ±300mA latchup current across operating range |
Applications
| Industrial Backplane Interface | Memory Address Buffering |
|---|---|
Use Scenario: Isolating CPU address lines from multiple memory modules on a shared 5V bus. IC Role / Device Role / Timing Role: Quad non-inverting buffer with per-channel 3-STATE control decouples address propagation and enables dynamic module selection. Use Value: 64mA sink capability drives long traces and multiple TTL inputs; sub-7ns disable timing prevents address bus glitches during module switching. | Use Scenario: Driving high-capacitance SRAM address inputs in embedded controllers with limited drive strength. IC Role / Device Role / Timing Role: Level-restoring buffer between microcontroller GPIO and memory address pins, operating at 5V. Use Value: 32mA source current overcomes trace capacitance; 0.8V/2.0V input thresholds ensure reliable recognition of marginal MCU outputs. |
| Legacy System Bus Arbitration | Digital I/O Expansion Interface |
Use Scenario: Managing bidirectional data flow between ISA-style peripheral cards and host controller. IC Role / Device Role / Timing Role: Direction-controlled bus driver using OE pins to gate data paths during read/write cycles. Use Value: Disable-before-enable timing eliminates bus contention; high-impedance state isolates unselected cards without pull-up dependencies. | Use Scenario: Extending GPIO count in PLC I/O modules where microcontroller pins must drive LEDs, relays, and optocouplers. IC Role / Device Role / Timing Role: Output buffer stage providing higher current and voltage margin than native MCU pins. Use Value: 64mA sink supports direct LED drive; 5.5V absolute max output rating tolerates transient coupling on industrial I/O lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT126DBR | TI version in SSOP-14 (5.3mm wide); identical AC/DC specs, same 3-STATE timing asymmetry | Same PCB footprint as 74ABT126CSJ but with different land pattern tolerances (SSOP vs EIAJ SOP) | Select when sourcing from TI distribution channels or requiring TI-specific qualification documentation |
| 74LVT126PW | NXP part in TSSOP-14; lower VCC range (2.7–3.6V), 32mA/64mA drive, but incompatible with 5V systems | Not suitable for 5V legacy designs; requires level translation if interfacing with 5V peripherals | Choose only for new 3.3V-only systems where lower power and smaller TSSOP package are prioritized |
Compared with SN74ABT126DBR and 74LVT126PW, the 74ABT126CSJ uniquely supports 5V operation with EIAJ SOP-14 mechanical compatibility, making it the sole option for drop-in replacement in existing 5V industrial backplane layouts requiring guaranteed hot-insertion and latchup immunity.
Availability
74ABT126CSJ is available at Aetrix Electronics and suitable for industrial backplane interface, memory address buffering, and legacy system bus arbitration requiring stable component supply and long-term lifecycle support.
Supply support for 74ABT126CSJ 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its ABT logic family remains widely deployed in industrial and telecom infrastructure.
The 74ABT126CSJ belongs to the Advanced BiCMOS Technology (ABT) logic series, engineered for high-speed 5V TTL-compatible bus interface with robustness against power sequencing and hot-swap events in mission-critical systems.
FAQ
What is the maximum supply voltage rating for the 74ABT126CSJ?
The 74ABT126CSJ has an absolute maximum VCC rating of +7.0V, but its recommended operating range is strictly +4.5V to +5.5V. Operation outside this window may cause timing violations or reduced reliability. The device includes input clamp diodes rated to –1.2V, supporting safe operation during power-down transients. Always maintain VCC within spec to ensure compliance with the 74ABT126CSJ's guaranteed AC/DC electrical characteristics.
Does the 74ABT126CSJ support hot insertion into a live 5V backplane?
Yes, the 74ABT126CSJ is explicitly designed for nondestructive hot insertion, verified per Fairchild's characterization. When VCC = 0V, the device withstands applied signals up to +7.0V on inputs/outputs without latchup or damage. This capability is enabled by internal protection structures and guaranteed latchup immunity up to ±300mA - a core feature confirmed in the 74ABT126CSJ datasheet Rev. 1.4.0.
What is the pin configuration difference between 74ABT126CSJ and 74ABT126CSC?
The 74ABT126CSJ uses an EIAJ TYPE II SOP-14 package (M14D), while the 74ABT126CSC uses a JEDEC MS-012 SOIC-14 (M14A). Both share identical pinout and logic function, but differ in body width (5.3mm vs 3.9mm), lead pitch tolerance, and land pattern requirements. The 74ABT126CSJ is not mechanically interchangeable with the 74ABT126CSC without PCB layout revision.
How does the 74ABT126CSJ prevent bus contention during enable/disable transitions?
The 74ABT126CSJ prevents bus contention by guaranteeing that output disable time (tPHZ ≤ 5.8ns) is strictly shorter than output enable time (tPZH ≤ 6.5ns). This timing asymmetry ensures outputs enter high-impedance state before new drivers activate - a design requirement validated across –40°C to +85°C. This behavior is intrinsic to the 74ABT126CSJ's internal control circuitry and is specified in its AC Electrical Characteristics table.
Is the 74ABT126CSJ RoHS compliant and lead-free?
Yes, the 74ABT126CSJ is lead-free and complies with JEDEC J-STD-020B for moisture sensitivity and reflow profiles. All packages, including the M14D SOP variant, meet RoHS Directive 2011/65/EU requirements. The device carries no exemption codes and is suitable for lead-free assembly processes - confirmed in the Ordering Information section of the 74ABT126CSJ datasheet Rev. 1.4.0.
74ABT126CSJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ABT
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 1
- 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:
- 14-SOP
74ABT126CSJ FAQ
1.How can I place an order for 74ABT126CSJ through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT126CSJ 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 74ABT126CSJ reliable?
The price and inventory of 74ABT126CSJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT126CSJ is usually 5 days.
3.What payment methods are accepted for 74ABT126CSJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT126CSJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT126CSJ?
74ABT126CSJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT126CSJ 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 74ABT126CSJ?
For technical support, including 74ABT126CSJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT126CSJ requirements.
6.How does Aetrix verify that 74ABT126CSJ is sourced from the original manufacturer or authorized distributors?
All 74ABT126CSJ 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 74ABT126CSJ meets industry standards.
7.What is the process for return or replacement of 74ABT126CSJ?
All 74ABT126CSJ units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT126CSJ, 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 74ABT126CSJ part is unused and in its original packaging.
Return procedure for 74ABT126CSJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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