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Texas Instruments SN74ABT125NSR
- Part No.:
- SN74ABT125NSR
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT125NSR.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,609
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Product details
Overview
SN74ABT125NSR from Texas Instruments is a quadruple bus buffer gate with independent 3-state outputs, designed for high-speed bidirectional data bus isolation in industrial and embedded systems. It delivers −32-mA high-level and 64-mA low-level output drive, supports hot insertion via Ioff and power-up 3-state logic, and operates across −40°C to 85°C at 4.5–5.5 V supply. Used in address/data bus buffering, memory interfacing, and level translation between TTL-compatible logic domains.
For engineers reviewing the SN74ABT125NSR datasheet, SN74ABT125NSR pinout, SN74ABT125NSR application, or SN74ABT125NSR equivalent, key selection criteria include its 3-state enable architecture, ground-bounce performance (<1 V VOLP), latch-up immunity (>500 mA), ESD robustness (2000-V HBM), and SOP-14 package compatibility with legacy board layouts.
Technical Context
The SN74ABT125NSR implements four independent noninverting buffers, each controlled by a dedicated output-enable (OE) input that places the Y output in high-impedance when driven high. Its ABT logic family uses bipolar transistor technology to achieve fast propagation delays (1–6.2 ns typical) and strong current sourcing/sinking capability.
Hot-insertion support is achieved through dual mechanisms: Ioff circuitry disables outputs during power-down to block reverse current flow, while power-up 3-state ensures outputs remain high-Z during VCC ramp-up/down-preventing bus contention. OE must be pulled up to VCC via external resistor to guarantee safe startup behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL and CMOS systems without level-shifting. |
| Output Drive | −32 mA IOH / 64 mA IOL - sufficient to drive heavy capacitive loads and multiple TTL inputs simultaneously. |
| Propagation Delay | 1 ns min / 4.9 ns max (tPLH, tPHL @ 5 V) - enables reliable operation in sub-10-ns timing-critical bus paths. |
| 3-State Enable Time | tPZL = 1–6.8 ns, tPHZ = 1–6.2 ns - fast transition into/out of high-impedance state minimizes bus turnaround latency. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - TTL-compatible logic levels ensure interoperability with legacy 5-V microcontrollers and peripherals. |
| Thermal Resistance | θJA = 76°C/W (NS package) - allows sustained operation at full drive strength without forced cooling in ambient ≤70°C. |
| ESD Rating | 2000-V HBM, 200-V MM - meets industrial-grade robustness requirements for handling and board-level reliability. |
Pinout & Package
SOP-14 (NS) package: 14-pin small-outline plastic package, 0.150-inch body width, 1.27-mm lead pitch, 2.0-mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | OE (Output Enable) | Active-low control per channel; high = high-Z output, low = enabled buffer path. |
| 2, 5, 11, 14 | A (Input) | Noninverting data input for corresponding buffer channel (1A–4A). |
| 3, 6, 12, 9 | Y (Output) | Noninverting buffered output (1Y–4Y); tri-stated when OE high. |
| 7 | GND | Ground reference for all internal circuitry and output drivers. |
| 14 | VCC | Positive supply rail (4.5–5.5 V); powers all four buffers and enable logic. |
Key Features
| Feature | Design Value |
|---|---|
| Hot-insertion support | Ioff and power-up 3-state prevent backflow current and bus conflict during live board insertion. |
| High-drive capability | −32 mA / +64 mA output current enables direct driving of 10+ TTL loads or long PCB traces. |
| Low ground bounce | VOLP < 1 V at 5 V/25°C reduces noise coupling into shared ground planes during switching. |
| Latch-up immunity | Exceeds 500 mA per JESD17 - eliminates risk of destructive latch-up under transient overvoltage conditions. |
| Input hysteresis | Vhys = 100 mV - improves noise margin on slow-rising or noisy control signals like manual switches or long cables. |
Applications
| Memory Bus Isolation | Microcontroller Peripheral Expansion |
|---|---|
|
Use Scenario: Isolating SRAM or Flash memory data/address buses from CPU during DMA or multi-master arbitration. IC Role / Device Role / Timing Role: Bidirectional buffer enabling/disabling memory access per channel using separate OE controls. Use Value: Prevents bus contention during simultaneous read/write cycles; supports 10-ns timing margins with guaranteed tPLH/tPHL ≤ 4.9 ns. |
Use Scenario: Expanding GPIO count of an MCU by connecting parallel peripherals (e.g., LCD controllers, ADCs) to a shared data bus. IC Role / Device Role / Timing Role: Level-translating and isolating peripheral data lines while maintaining TTL-compatible voltage thresholds. Use Value: Eliminates need for discrete pull-ups or level shifters; 64-mA sink current drives capacitive loads up to 100 pF without signal degradation. |
| Industrial Backplane Interface | Legacy System Bus Translation |
|
Use Scenario: Interfacing modern 5-V logic to legacy backplane systems with strict hot-swap requirements. IC Role / Device Role / Timing Role: Hot-pluggable bus driver ensuring zero-current backflow and glitch-free enable sequencing. Use Value: Ioff < ±100 µA at VCC = 0 V prevents damage during partial power-up; MSL Level-1 supports reflow assembly without moisture sensitivity concerns. |
Use Scenario: Replacing obsolete 74LS/74ALS buffers in aging test equipment or instrumentation where footprint and pinout must match. IC Role / Device Role / Timing Role: Drop-in SOP-14 replacement with identical pinout and enhanced drive strength over legacy families. Use Value: Maintains mechanical and electrical compatibility while improving noise immunity (2000-V HBM) and reducing ground bounce by >30% vs. LS-series. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125APW | Lower drive (−24 mA / 24 mA), 1.65–3.6 V supply, CMOS process | Designed for 3.3-V systems; not 5-V tolerant without external level shifting | Select when operating in mixed-voltage domains with strict power budget constraints |
| SN74AHCT125N | Same 4.5–5.5 V range, lower drive (−8 mA / 8 mA), higher propagation delay (7 ns max) | Compatible with 5-V TTL but lacks Ioff and hot-insertion support | Choose only for cost-sensitive, non-hot-swap applications where reduced drive suffices |
Compared with SN74LVC125APW and SN74AHCT125N, the SN74ABT125NSR uniquely combines 5-V operation, hot-insertion safety, and high-current drive-making it irreplaceable in industrial backplanes and memory subsystems requiring robust bus arbitration.
Availability
SN74ABT125NSR is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and test equipment applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74ABT125NSR 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74ABT125NSR belongs to TI's ABT logic family, engineered specifically for high-speed, high-drive 5-V bus interface applications demanding hot-swap resilience and noise-immune operation in harsh environments.
FAQ
What is the maximum output current rating for SN74ABT125NSR?
The SN74ABT125NSR supports −32 mA high-level output current (IOH) and 64 mA low-level output current (IOL) under recommended operating conditions. These values are specified at VCC = 4.5 V and TA = 25°C, and represent worst-case drive capability per output channel. Exceeding these limits risks thermal overstress or parametric shift.
Does SN74ABT125NSR support hot insertion, and how is it implemented?
Yes, SN74ABT125NSR supports hot insertion via two integrated features: Ioff circuitry disables outputs when VCC = 0 V to prevent damaging current backflow, and power-up 3-state holds outputs in high-impedance during VCC ramp-up/down. Both functions are inherent to the silicon design and require no external components beyond a pull-up resistor on OE.
What is the pinout configuration of SN74ABT125NSR in the SOP-14 (NS) package?
The SN74ABT125NSR in SOP-14 has the following pinout: Pin 1 = 1OE, Pin 2 = 1A, Pin 3 = 1Y, Pin 4 = 2OE, Pin 5 = 2A, Pin 6 = 2Y, Pin 7 = GND, Pin 8 = VCC, Pin 9 = 4Y, Pin 10 = 4OE, Pin 11 = 4A, Pin 12 = 3Y, Pin 13 = 3OE, Pin 14 = 3A. This matches the standard NS package top-view diagram in TI's SCBS182I datasheet.
Can SN74ABT125NSR be used in 3.3-V systems?
No, SN74ABT125NSR is not rated for 3.3-V operation. Its absolute minimum supply voltage is 4.5 V, and input thresholds (VIH = 2.0 V, VIL = 0.8 V) assume 5-V logic levels. Using it below 4.5 V may cause undefined output states, increased propagation delay, or failure to meet timing specifications.
What thermal considerations apply to SN74ABT125NSR in continuous operation?
SN74ABT125NSR has a junction-to-ambient thermal resistance (θJA) of 76°C/W in the SOP-14 (NS) package. At maximum rated output current (64 mA), power dissipation can reach ~350 mW per active channel. For four channels fully loaded, ambient temperature must remain ≤70°C with adequate PCB copper area to avoid exceeding the 150°C max junction temperature.
SN74ABT125NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-SO
SN74ABT125NSR FAQ
1.How can I place an order for SN74ABT125NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT125NSR 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 SN74ABT125NSR reliable?
The price and inventory of SN74ABT125NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT125NSR is usually 5 days.
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4.How is shipping managed for SN74ABT125NSR?
SN74ABT125NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT125NSR 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 SN74ABT125NSR?
For technical support, including SN74ABT125NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT125NSR requirements.
6.How does Aetrix verify that SN74ABT125NSR is sourced from the original manufacturer or authorized distributors?
All SN74ABT125NSR 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 SN74ABT125NSR meets industry standards.
7.What is the process for return or replacement of SN74ABT125NSR?
All SN74ABT125NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT125NSR, 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 SN74ABT125NSR part is unused and in its original packaging.
Return procedure for SN74ABT125NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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