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Texas Instruments SN74ABT125D
- Part No.:
- SN74ABT125D
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74ABT125D.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,416
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Product details
Overview
SN74ABT125D from Texas Instruments is a quadruple bus buffer gate with independent 3-state outputs, designed for high-speed TTL-compatible data bus isolation and driving in industrial control and computing systems. It delivers −32-mA high-level and 64-mA low-level output drive, supports hot insertion via Ioff and power-up 3-state, and operates across −40°C to 85°C with 4.5–5.5-V supply.
For engineers reviewing the SN74ABT125D datasheet, SN74ABT125D pinout, SN74ABT125D application, or SN74ABT125D equivalent, this page provides verified functional specifications, SOIC-14 package layout, hot-swap interface design guidance, and validated alternative options for bus buffering in legacy and mixed-voltage digital systems.
Technical Context
The SN74ABT125D implements four independent noninverting buffers, each with dedicated output-enable (OE) control. Its architecture enables per-channel 3-state management without internal bus contention, supporting dynamic bus sharing in multi-master environments.
It features active-low OE logic, ground-bounce-limited VOLP (<1 V at 5 V), and robust ESD protection (2000-V HBM, 200-V MM). The device meets JEDEC JESD-17 latch-up immunity (>500 mA) and supports safe hot insertion through Ioff current limiting and power-up 3-state behavior.
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 mixed-supply systems without level-shifting. |
| Output Drive | −32 mA IOH / 64 mA IOL - Enables direct driving of heavy capacitive loads (e.g., >100 pF buses) and fan-out to ≥10 standard TTL inputs. |
| Propagation Delay | 1 ns to 6 ns (tPLH/tPHL) - Supports >100-MHz bus operation in short trace configurations with tight timing margins. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - Guarantees reliable recognition of TTL-level signals across temperature and voltage variation. |
| Ioff Current | ±100 µA at VCC = 0 - Prevents backflow damage during live board insertion by disabling outputs when unpowered. |
| Thermal Resistance | θJA = 86°C/W (SOIC-D) - Allows sustained operation at full drive under natural convection in compact industrial enclosures. |
| ESD Rating | 2000-V HBM, 200-V MM - Meets industrial handling requirements without additional external protection circuitry. |
Pinout & Package
SN74ABT125D is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package, 3.90 mm wide, 8.65 mm long, 1.75 mm max height, with 1.27-mm lead pitch and NiPdAu lead finish. RoHS-compliant, MSL Level-1, tape-and-reel or tube packaging available.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Output Enable (OE) | Active-low control per channel; high = high-Z output, enabling independent bus arbitration. |
| 2, 5, 11, 14 | Input (A) | Noninverting data input for corresponding buffer channel (1A–4A). |
| 3, 6, 12, 9 | Output (Y) | Buffered noninverting output (1Y–4Y); driven low/high or placed in high-impedance state per OE. |
| 7 | GND | Power return reference for all logic and output stages; requires low-inductance connection to minimize ground bounce. |
| 14 | VCC | Primary 4.5–5.5-V supply; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin for stable switching. |
Key Features
| Feature | Design Value |
|---|---|
| Hot-insertion support | Integrated Ioff and power-up 3-state prevent current backflow and bus conflicts during live card replacement. |
| High-drive capability | 64-mA sink current allows direct interfacing with unterminated transmission lines and legacy TTL loads without external drivers. |
| Low ground bounce | VOLP < 1 V ensures signal integrity on shared ground planes during simultaneous output transitions. |
| Latch-up immunity | Exceeds 500 mA per JEDEC JESD-17 - eliminates risk of destructive latch-up in noisy industrial environments. |
| Input hysteresis | 100-mV typical Vhys rejects noise on slow-rising or floating control lines (e.g., mechanical switch inputs). |
Applications
| Industrial PLC Backplane Interface | Legacy Computer Memory Expansion Bus |
|---|---|
|
Use Scenario: Isolating CPU address/data lines from modular I/O cards in programmable logic controllers with hot-swap capability. IC Role / Device Role / Timing Role: Bidirectional bus buffer with per-slot OE control, enabling dynamic reconfiguration without system reset. Use Value: Eliminates need for external bus switches or level translators while maintaining TTL-compatible timing and drive strength. |
Use Scenario: Driving extended memory modules on ISA or VMEbus-based embedded computers with long parallel traces. IC Role / Device Role / Timing Role: High-current noninverting buffer stage between microprocessor and memory subsystem. Use Value: Sustains signal integrity over 15-cm traces at 8-MHz clock rates without added termination or repeaters. |
| Automotive Diagnostic Tool Data Bridge | Test Equipment Signal Conditioning Module |
|
Use Scenario: Translating and buffering ISO 9141-2 K-line signals between microcontroller UART and vehicle OBD-II port. IC Role / Device Role / Timing Role: Unidirectional level-consistent buffer with controlled enable sequencing for protocol handshaking. Use Value: Provides ESD-hardened interface (2000-V HBM) and ground-noise rejection (100-mV hysteresis) in electrically harsh automotive environments. |
Use Scenario: Conditioning digital stimulus/response signals in automated test equipment where multiple instruments share a common bus. IC Role / Device Role / Timing Role: Channel-isolated buffer enabling selective instrument enable/disable without bus contention. Use Value: Delivers sub-6-ns propagation delay and <1-V ground bounce to preserve edge fidelity in high-precision timing measurements. |
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 (−24/24 mA), 1.65–3.6-V supply, CMOS input thresholds | Better suited for 3.3-V-only systems; not TTL-compatible; lacks Ioff and hot-insertion support | Select when operating exclusively at 3.3 V and lower power consumption is prioritized over legacy bus compatibility. |
| SN74ACT125N | Same pinout, 4.5–5.5-V supply, but ±24-mA drive and no Ioff circuitry | Compatible for static 5-V bus isolation but unsafe for hot-plug scenarios due to missing power-down protection | Choose only for fixed-installation systems where board insertion occurs with power off and thermal stress is minimal. |
Compared with SN74LVC125APW and SN74ACT125N, the SN74ABT125D uniquely combines TTL-compatible thresholds, hot-insertion safety, and high-current drive-making it irreplaceable in legacy 5-V industrial backplanes requiring field-serviceability and signal integrity under load.
Availability
SN74ABT125D is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, legacy computer memory expansion buses, and automotive diagnostic tool data bridges requiring stable component supply across extended product lifecycles.
Supply support for SN74ABT125D 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 delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets since 1930.
The ABT logic family-including SN74ABT125D-is engineered for high-speed, high-drive 5-V TTL-compatible bus interfacing in mission-critical industrial and computing infrastructure.
FAQ
What is the maximum allowable output current for SN74ABT125D per channel?
The SN74ABT125D supports up to −32 mA high-level output current (IOH) and 64 mA low-level output current (IOL) per channel under recommended operating conditions. Absolute maximum ratings allow brief 128-mA sink current, but continuous operation above 64 mA risks thermal derating and must be validated with θJA = 86°C/W and ambient temperature constraints.
Does SN74ABT125D support hot insertion, and how is it implemented?
Yes, SN74ABT125D supports hot insertion via two integrated features: Ioff circuitry disables outputs when VCC = 0, limiting reverse current to ±100 µA, and power-up 3-state holds outputs in high impedance during supply ramp-up. These functions eliminate bus contention and backfeed damage during live card replacement in industrial backplanes.
Can SN74ABT125D operate reliably at 3.3 V?
No-SN74ABT125D is specified only for 4.5 V to 5.5 V supply. At 3.3 V, VIH (2.0 V) and VIL (0.8 V) thresholds become noncompliant, output drive collapses below specification, and timing parameters (e.g., tPLH) degrade beyond guaranteed limits. For 3.3-V systems, consider SN74LVC125A instead.
What is the purpose of the 100-mV input hysteresis (Vhys) in SN74ABT125D?
The 100-mV typical input hysteresis in SN74ABT125D prevents chatter on slow-rising or noisy control signals (e.g., mechanical switch debouncing or long PCB traces). It ensures clean, single-transition response at the input threshold, eliminating multiple output toggles during marginal voltage transitions-a critical feature in industrial control interfaces.
How should unused inputs be handled on SN74ABT125D?
All unused inputs on SN74ABT125D must be tied to either VCC or GND to prevent floating nodes that cause excessive ICC current, increased noise susceptibility, and potential logic instability. TI application report SCBA004 explicitly mandates this practice for proper device operation and thermal reliability.
SN74ABT125D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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-SOIC
SN74ABT125D FAQ
1.How can I place an order for SN74ABT125D through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT125D 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 SN74ABT125D reliable?
The price and inventory of SN74ABT125D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT125D is usually 5 days.
3.What payment methods are accepted for SN74ABT125D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT125D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT125D?
SN74ABT125D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT125D 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 SN74ABT125D?
For technical support, including SN74ABT125D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT125D requirements.
6.How does Aetrix verify that SN74ABT125D is sourced from the original manufacturer or authorized distributors?
All SN74ABT125D 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 SN74ABT125D meets industry standards.
7.What is the process for return or replacement of SN74ABT125D?
All SN74ABT125D units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT125D, 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 SN74ABT125D part is unused and in its original packaging.
Return procedure for SN74ABT125D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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