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Texas Instruments SN74ABT125DBR
- Part No.:
- SN74ABT125DBR
- Manufacturer:
- Texas Instruments
- Package:
- 14-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT125DBR.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 14SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:193
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Product details
Overview
SN74ABT125DBR from Texas Instruments is a quadruple 3-state bus buffer gate IC used for bidirectional data isolation and signal fan-out in 5-V TTL-compatible digital systems. It features independent output-enable control per channel, high-drive capability (−32 mA IOH / 64 mA IOL), hot-insertion support via Ioff and power-up 3-state, and operates across −40°C to 85°C.
For engineers reviewing the SN74ABT125DBR datasheet, SN74ABT125DBR pinout, SN74ABT125DBR application, or SN74ABT125DBR equivalent, key selection criteria include its SSOP-14 package thermal performance (θJA = 96°C/W), ground-bounce immunity (<1 V VOLP), latch-up robustness (>500 mA), and compatibility with legacy ABT logic families in backplane, memory interface, and bus arbitration designs.
Technical Context
The SN74ABT125DBR implements four independent noninverting buffers, each with dedicated active-low output-enable (OE) control. Its output stage uses bipolar transistor technology optimized for high-current sinking and sourcing while maintaining TTL input thresholds (VIH = 2 V, VIL = 0.8 V) and fast propagation (tPLH/tPHL ≤ 4.9 ns at 5 V).
Designed for hot-plug environments, it integrates Ioff circuitry that disables outputs when VCC = 0 V (±100 µA leakage), and power-up 3-state logic that forces outputs to high-impedance during supply ramp-up/down-preventing bus contention without external pull-ups on OE lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation within standard 5-V TTL rail tolerances |
| Output Drive | −32 mA IOH / +64 mA IOL - supports driving heavy capacitive loads or multiple TTL inputs |
| Propagation Delay | ≤ 4.9 ns (A→Y) - enables use in high-speed address/data bus applications up to ~200 MHz |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - guarantees interoperability with standard TTL and 5-V CMOS logic |
| Thermal Resistance | θJA = 96°C/W (SSOP-14) - defines maximum power dissipation limit under natural convection |
| ESD Rating | 2000-V HBM, 200-V MM - meets industrial-level ESD robustness requirements |
| Latch-Up Immunity | >500 mA per JEDEC JESD-17 - prevents destructive latch-up during transient overvoltage events |
Pinout & Package
SN74ABT125DBR is housed in a 14-pin Shrink Small Outline Package (SSOP-14), 5.3 mm × 6.2 mm body size, 0.65 mm lead pitch, 2.0 mm max height, RoHS-compliant NiPdAu lead finish, and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | OE (Output Enable) | Active-low control per buffer; high = high-Z output, low = enabled buffer |
| 2, 5, 11, 14 | A (Input) | Noninverting data input for corresponding buffer channel |
| 3, 6, 12, 9 | Y (Output) | Noninverting buffered output; tri-stated when OE = high |
| 7 | GND | Digital ground reference for all internal logic and output stages |
| 14 | VCC | Positive supply rail (4.5–5.5 V); powers all four buffer channels and control logic |
Key Features
| Feature | Design Value |
|---|---|
| Hot-Insertion Support | Ioff and power-up 3-state prevent current backflow and bus conflicts during live board insertion |
| High-Drive Outputs | −32 mA sourcing / +64 mA sinking enables direct drive of 10+ TTL loads or 50-Ω transmission lines |
| Low Ground Bounce | VOLP < 1 V at 5 V/25°C reduces noise coupling into shared GND planes |
| TTL-Compatible Inputs | VIH = 2.0 V / VIL = 0.8 V ensures seamless integration with legacy 5-V logic families |
| Robust ESD/Latch-Up | 2000-V HBM ESD and >500 mA latch-up immunity meet industrial reliability standards |
Applications
| Backplane Bus Isolation | Memory Address Buffering |
|---|---|
Use Scenario: Isolating CPU address/data buses from peripheral slots in modular industrial controllers. IC Role / Device Role / Timing Role: Quad 3-state buffer providing directional signal isolation and fan-out between master and slave modules. Use Value: Prevents bus contention during hot-swap operations and supports up to 64 mA load per line without external drivers. | Use Scenario: Driving address lines to multiple SRAM or Flash devices in embedded microcontroller systems. IC Role / Device Role / Timing Role: Noninverting buffer with low propagation delay (≤4.9 ns) ensuring setup/hold timing margins are maintained. Use Value: Enables reliable 20-MHz+ address strobing with TTL-compatible voltage levels and minimal skew across channels. |
| Legacy System Logic Interface | Test Equipment Signal Conditioning |
Use Scenario: Interfacing modern FPGA I/O banks to legacy 5-V TTL peripherals in retro-computing or instrumentation upgrades. IC Role / Device Role / Timing Role: Level-shifting and drive-strengthening buffer preserving signal integrity across mixed-voltage domains. Use Value: Eliminates need for discrete resistor networks or additional level translators due to native 5-V tolerance and high noise margin. | Use Scenario: Conditioning control signals (e.g., trigger, enable, reset) in automated test equipment with long PCB traces. IC Role / Device Role / Timing Role: Low-skew, high-drive buffer reducing rise/fall time degradation over 10-cm traces. Use Value: Maintains clean 1.5-V/ns edge rates and suppresses ground bounce-induced jitter in synchronized multi-channel testers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT244DBR | Octal (8-channel) vs. quad (4-channel); identical SSOP-20 package, same VCC range and drive strength | Suitable for wider data buses (e.g., 16-bit address/data paths); requires more PCB area and routing | Select when higher channel count is needed without changing logic family or timing behavior |
| SN74LVC125DR | 3.3-V only (1.65–3.6 V), lower drive (−24/+24 mA), smaller SOIC-14 package, no Ioff/hot-swap support | Targeted for low-power, mixed-voltage 3.3-V systems; not suitable for 5-V TTL or hot-plug environments | Choose only for 3.3-V-only designs where power efficiency and footprint are prioritized over 5-V compatibility |
Compared with SN74ABT244DBR and SN74LVC125DR, the SN74ABT125DBR uniquely balances 5-V TTL compatibility, hot-insertion safety, and compact 4-channel buffering-making it optimal for space-constrained industrial backplanes requiring legacy voltage support and robustness.
Availability
SN74ABT125DBR is available at Aetrix Electronics and suitable for industrial backplane isolation, memory subsystem buffering, and legacy TTL interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74ABT125DBR 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 SN74ABT125DBR belongs to TI's ABT logic family-designed specifically for high-speed, high-drive 5-V TTL-compatible bus interfacing in mission-critical industrial and telecom infrastructure.
FAQ
What is the operating temperature range for the SN74ABT125DBR?
The SN74ABT125DBR is specified for operation from −40°C to +85°C ambient temperature, making it suitable for industrial-grade applications including factory automation controllers, programmable logic systems, and outdoor communications equipment where extended thermal stability is required.
Does the SN74ABT125DBR support hot insertion?
Yes, the SN74ABT125DBR supports hot insertion through integrated Ioff circuitry (±100 µA leakage at VCC = 0 V) and power-up 3-state logic, which forces outputs into high-impedance during power ramp-up/down-eliminating bus contention without requiring external OE pull-up resistors.
What is the maximum output current capability of the SN74ABT125DBR?
The SN74ABT125DBR delivers −32 mA sourcing current (IOH) and +64 mA sinking current (IOL) per output, enabling direct drive of up to 10 standard TTL loads or termination of 50-Ω transmission lines in high-speed digital interfaces.
Can the SN74ABT125DBR be used with 3.3-V logic inputs?
No-the SN74ABT125DBR is a 5-V-only device with TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max). While 3.3-V logic may functionally drive it in many cases, TI does not guarantee operation below VCC = 4.5 V, and marginal noise margins may occur without level translation.
What package type is used for the SN74ABT125DBR?
The SN74ABT125DBR uses a 14-pin Shrink Small Outline Package (SSOP-14), designated DB, with 0.65 mm lead pitch, 5.3 mm × 6.2 mm body dimensions, 2.0 mm max height, and RoHS-compliant NiPdAu surface finish.
SN74ABT125DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 14-SSOP (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-SSOP
SN74ABT125DBR FAQ
1.How can I place an order for SN74ABT125DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT125DBR 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 SN74ABT125DBR reliable?
The price and inventory of SN74ABT125DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT125DBR is usually 5 days.
3.What payment methods are accepted for SN74ABT125DBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT125DBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT125DBR?
SN74ABT125DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT125DBR 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 SN74ABT125DBR?
For technical support, including SN74ABT125DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT125DBR requirements.
6.How does Aetrix verify that SN74ABT125DBR is sourced from the original manufacturer or authorized distributors?
All SN74ABT125DBR 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 SN74ABT125DBR meets industry standards.
7.What is the process for return or replacement of SN74ABT125DBR?
All SN74ABT125DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT125DBR, 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 SN74ABT125DBR part is unused and in its original packaging.
Return procedure for SN74ABT125DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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