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onsemi 74ABT125CSJX
- Part No.:
- 74ABT125CSJX
- Manufacturer:
- onsemi
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74ABT125CSJX.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,563
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Product details
Overview
74ABT125CSJX from Fairchild Semiconductor is a quad non-inverting buffer IC with 3-STATE outputs, designed for bus interface and signal isolation in 5V TTL-compatible systems. It delivers 32mA output source drive, 64mA sink capability, and operates across –40°C to +85°C with supply voltage 4.5V–5.5V. Used in memory address/data buffering and microprocessor bus expansion.
For engineers reviewing the 74ABT125CSJX datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed latchup protection, high-impedance glitch-free power-up/down behavior, nondestructive hot insertion support, and disable time < enable time to prevent bus contention.
Technical Context
The 74ABT125CSJX implements four independent buffer channels, each with separate input (An), output (On), and no dedicated enable pin-output control is achieved via logic-level gating per channel using complementary inputs (An/Bn) as shown in the function table. All outputs enter high-impedance state when Bn = HIGH.
It employs ABT (Advanced BiCMOS Technology) architecture to achieve fast propagation delays (tPLH/tPHL ≤ 4.9ns max at 5V/50pF), low dynamic ICC (0.1mA/MHz), and robust ESD/latchup protection per JEDEC JESD78. Input clamp diodes and rail-to-rail I/O tolerance (–0.5V to 7.0V) support mixed-voltage interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +4.5V to +5.5V - ensures compatibility with standard 5V TTL and CMOS logic rails |
| Output Drive | 32mA source / 64mA sink - supports driving multiple TTL loads or moderate-capacitance buses |
| Propagation Delay | ≤4.9ns (tPHL, VCC=5V, CL=50pF) - enables use in high-speed address/data paths up to ~200MHz toggle rate |
| Input Thresholds | VIH ≥ 2.0V, VIL ≤ 0.8V - provides noise margin >0.4V under 5V operation |
| Power-Up Behavior | Glitch-free high-impedance during entire power ramp - prevents spurious bus loading on system boot |
| Hot Insertion | Nondestructive - allows safe live insertion into powered backplanes without damaging connected circuitry |
Pinout & Package
74ABT125CSJX is housed in a 14-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm wide (Package Code M14D), with gull-wing leads and standard SOIC footprint compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Input A (A1–A4) | Data input for corresponding buffer channel; active HIGH |
| 2, 5, 9, 12 | Input B (B1–B4) | Enable/control input; HIGH forces associated output into 3-STATE (Z) |
| 3, 6, 8, 11 | Output O (O1–O4) | Non-inverting buffered output; driven LOW/HIGH when Bn = LOW, high-Z when Bn = HIGH |
| 7 | GND | Ground reference for all I/O and internal circuitry |
| 14 | VCC | +5V supply rail; decoupling capacitor required near pin for stable switching |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed latchup protection | Rated to ±300mA DC latchup current and 10V overvoltage latchup threshold - eliminates need for external current limiting in most board-level designs |
| Disable time < enable time | tPZL ≤ 6.8ns, tPZH ≤ 5.1ns - ensures outputs enter high-Z before new data appears, preventing bus contention during direction changes |
| High-impedance glitch-free power sequencing | No output glitches during VCC ramp from 0V to 5V or shutdown - critical for hot-plug and fail-safe system initialization |
| Input clamp diode protection | VCD ≥ –1.2V at –18mA - safely clamps negative transients without requiring external diodes |
Applications
| Memory Address Buffering | Microprocessor Bus Expansion |
|---|---|
Use Scenario: Isolating and driving CPU address lines to multiple memory chips on a shared bus. IC Role / Device Role / Timing Role: Non-inverting buffer with 3-STATE control per line to enable/disable memory chip select timing windows. Use Value: 64mA sink drive ensures clean logic transitions across 10+ TTL loads; glitch-free power-up prevents erroneous memory access at boot. | Use Scenario: Extending an 8-bit data bus from a microcontroller to peripheral ICs in industrial control modules. IC Role / Device Role / Timing Role: Quad-channel bidirectional bus isolator - used with complementary enable signals to manage data flow direction. Use Value: Sub-5ns propagation delay preserves setup/hold timing margins; nondestructive hot insertion allows field-replaceable peripheral cards. |
| Test Equipment Signal Routing | Legacy System Interfacing |
Use Scenario: Multiplexing digital test signals between DUT and measurement instruments in ATE fixtures. IC Role / Device Role / Timing Role: Logic-level translator and bus driver with precise 3-STATE timing control for signal path selection. Use Value: Disable time < enable time eliminates signal collisions during reconfiguration; rail-to-rail input tolerance accepts ±0.5V to 7.0V inputs from diverse sources. | Use Scenario: Bridging 5V TTL logic in legacy instrumentation with newer 3.3V FPGA I/O banks via level-shifting buffers. IC Role / Device Role / Timing Role: Voltage-tolerant interface buffer enabling safe interconnection without level shifters. Use Value: Input clamp diodes and –0.5V to 7.0V VI rating protect FPGA pins from overvoltage; 4.5V–5.5V VCC range ensures stable 5V operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad buffer with 3-STATE applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT125DBR | TI version in SSOP-14 (M14A footprint); identical AC/DC specs but different thermal resistance and moisture sensitivity level | Same functional behavior; requires PCB land pattern adjustment for SSOP vs SOP | Preferred for TI-centric BOMs or where SSOP package preferred for density |
| 74LVT125PW,118 | NXP version in TSSOP-14; operates at 2.7–3.6V only; lower drive (12mA/12mA), higher speed (2.8ns typ) | Not 5V-compatible; unsuitable for legacy 5V bus systems but ideal for 3.3V LVTTL domains | Select only for 3.3V-only designs requiring lower power and faster edge rates |
Compared with SN74ABT125DBR and 74LVT125PW,118, the 74ABT125CSJX uniquely supports full 5V operation with 64mA sink drive and EIAJ SOP packaging - making it optimal for industrial backplane interfaces where voltage margin, ruggedness, and mechanical compatibility are prioritized over ultra-low power or sub-3V use.
Availability
74ABT125CSJX is available at Aetrix Electronics and suitable for memory subsystem design, microprocessor bus extension, test equipment signal routing, and legacy system interfacing requiring stable component supply and long-term industrial availability.
Supply support for 74ABT125CSJX 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 discrete power products, acquired by ON Semiconductor in 2016. Its ABT logic family emphasized speed, drive strength, and robustness for industrial and computing applications.
The 74ABT125CSJX belongs to Fairchild's Advanced BiCMOS TTL-compatible logic series, engineered for high-noise-margin, high-drive bus interface in mission-critical 5V systems such as telecom infrastructure, factory automation controllers, and test instrumentation.
FAQ
What is the recommended operating voltage range for the 74ABT125CSJX?
The 74ABT125CSJX is specified for reliable operation at VCC = +4.5V to +5.5V. Operation outside this range may cause undefined logic states or reduced drive capability. The absolute maximum rating allows up to +7.0V, but sustained use above 5.5V voids parametric guarantees and risks long-term reliability degradation. Always maintain VCC within the recommended range for full compliance with AC/DC specifications in the 74ABT125CSJX datasheet.
Does the 74ABT125CSJX support hot insertion into a live 5V backplane?
Yes, the 74ABT125CSJX features nondestructive hot insertion capability per its datasheet. This is enabled by internal input clamp diodes, controlled power-up sequencing, and rail-to-rail input tolerance (–0.5V to +7.0V). When inserted into a powered system, the 74ABT125CSJX will not draw destructive current or generate disruptive transients - provided VCC is applied before or concurrently with signal inputs, and proper decoupling is present.
How does the 3-STATE control work on the 74ABT125CSJX?
The 74ABT125CSJX uses dual-input per channel: An (data) and Bn (enable). When Bn = LOW, the output On follows An (non-inverting). When Bn = HIGH, On enters high-impedance (Z), regardless of An state. There is no global OE pin - each of the four buffers has independent Bn control. This architecture allows selective channel disabling without affecting others, supporting flexible bus arbitration schemes in the 74ABT125CSJX implementation.
What is the maximum capacitive load the 74ABT125CSJX can drive while maintaining timing specs?
The 74ABT125CSJX AC specifications (e.g., tPLH ≤ 4.9ns) are guaranteed at CL = 50pF. While it can drive heavier loads, propagation delay increases approximately linearly with capacitance - e.g., at 100pF, delay may exceed 7ns. For reliable timing closure in high-speed designs, keep total net capacitance ≤50pF per output, including trace, stub, and receiver input capacitance. Exceeding this requires derating timing margins or adding repeaters.
Is the 74ABT125CSJX RoHS-compliant and lead-free?
Yes, the 74ABT125CSJX is lead-free and complies with JEDEC J-STD-020B for moisture sensitivity and RoHS Directive 2011/65/EU. All packages-including the M14D SOP variant used in 74ABT125CSJX-are manufactured with matte tin lead finish and halogen-free molding compound. The device carries the "Pb-Free" marking on the top-side laser etch and is qualified for reflow soldering per JEDEC Level 3 profile.
74ABT125CSJX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ABT
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
74ABT125CSJX FAQ
1.How can I place an order for 74ABT125CSJX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT125CSJX 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 74ABT125CSJX reliable?
The price and inventory of 74ABT125CSJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT125CSJX is usually 5 days.
3.What payment methods are accepted for 74ABT125CSJX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT125CSJX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT125CSJX?
74ABT125CSJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT125CSJX 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 74ABT125CSJX?
For technical support, including 74ABT125CSJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT125CSJX requirements.
6.How does Aetrix verify that 74ABT125CSJX is sourced from the original manufacturer or authorized distributors?
All 74ABT125CSJX 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 74ABT125CSJX meets industry standards.
7.What is the process for return or replacement of 74ABT125CSJX?
All 74ABT125CSJX units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT125CSJX, 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 74ABT125CSJX part is unused and in its original packaging.
Return procedure for 74ABT125CSJX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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