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Texas Instruments SN74ABT125PW
- Part No.:
- SN74ABT125PW
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ABT125PW.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,672
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Product details
Overview
SN74ABT125PW from Texas Instruments is a quadruple bus buffer gate with independent 3-state outputs, designed for high-speed TTL-compatible data routing in industrial control backplanes and memory interface buses. 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 SN74ABT125PW datasheet, SN74ABT125PW pinout, SN74ABT125PW application, or SN74ABT125PW equivalent, key selection criteria include its TSSOP-14 package thermal performance (θJA = 113°C/W), ground-bounce immunity (<1 V VOLP), latch-up robustness (>500 mA), and compatibility with legacy 5-V TTL logic families in space-constrained PCB layouts.
Technical Context
The SN74ABT125PW implements four independent noninverting buffers, each with dedicated output-enable (OE) control enabling per-channel 3-state management. Its Ioff circuitry actively disables outputs during power-down to prevent current backflow, while power-up 3-state ensures high-impedance outputs during VCC ramp-up/down-critical for live-insertion systems.
Each buffer exhibits propagation delays of 1–6.5 ns (tPLH/tPHL) and enable/disable times of 1–7.5 ns (tPZH/tPZL) at 5 V, with input hysteresis (100 mV) enhancing noise immunity on slow-rising control signals. The device complies with JEDEC JESD-17 latch-up and JESD-22 ESD standards (2000-V HBM, 200-V MM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5–5.5 V - compatible with standard 5-V TTL rails; no level-shifting required |
| Output Drive | −32 mA IOH / 64 mA IOL - drives heavy capacitive loads and multiple TTL inputs without external buffers |
| Propagation Delay | 1–6.5 ns - enables sub-100-MHz bus operation in synchronous data paths |
| Input Hysteresis | 100 mV - rejects noise on OE and A inputs in electrically noisy industrial environments |
| Thermal Resistance | θJA = 113°C/W - defines maximum power dissipation (≤360 mW at 85°C ambient) in TSSOP-14 layout |
| ESD Rating | 2000-V HBM - meets IEC 61000-4-2 Level 3 for handling robustness in manufacturing |
| Latch-Up Immunity | >500 mA per JEDEC JESD-17 - prevents destructive failure during transient overcurrent events |
Pinout & Package
TSSOP-14 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, 1.2 mm max height, exposed pad not present. RoHS-compliant NiPdAu lead finish, MSL Level-1 (260°C reflow unlimited).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Output Enable (1OE, 2OE, 3OE, 4OE) | Active-low control per channel; tie to VCC via pullup for safe power-up state |
| 2, 5, 11, 14 | Input (1A, 2A, 3A, 4A) | TTL-compatible inputs; must be terminated to VCC or GND if unused per SCBA004 |
| 3, 6, 9, 12 | Output (1Y, 2Y, 3Y, 4Y) | Noninverting buffered outputs; high-impedance when corresponding OE = high |
| 7 | GND | Power return reference; requires low-inductance connection to minimize ground bounce |
| 14 | VCC | 5-V supply rail; decoupling capacitor (0.1 µF ceramic) required within 5 mm |
Key Features
| Feature | Design Value |
|---|---|
| Ioff Support | Prevents damaging backflow current during hot insertion by disabling outputs when VCC = 0 |
| Power-Up 3-State | Guarantees high-Z outputs during VCC ramp, eliminating bus contention at system startup |
| High-Drive Outputs | −32/64 mA drive capability sustains signal integrity driving 10+ TTL loads or 50-pF traces |
| Ground Bounce Immunity | VOLP <1 V at 5 V/25°C ensures clean low-level transitions in dense multi-buffer layouts |
| Robust ESD/Latch-Up | 2000-V HBM and >500 mA latch-up rating enable use in unshielded industrial enclosures |
Applications
| Industrial Backplane Interface | Memory Address Buffering |
|---|---|
Use Scenario: Isolating address/data lines between CPU and peripheral modules in modular PLC racks. IC Role / Device Role / Timing Role: Bidirectional bus buffer with per-lane OE control enabling dynamic slot arbitration. Use Value: Prevents bus contention during hot-swap of I/O modules while maintaining 5-V TTL timing margins. | Use Scenario: Driving multiplexed address lines to SRAM or Flash memory arrays in embedded controllers. IC Role / Device Role / Timing Role: Noninverting voltage translator and fanout amplifier for address decode logic. Use Value: −32/64 mA drive ensures setup/hold timing compliance across 15-cm PCB traces loaded with 8 memory devices. |
| Legacy System Bus Extender | Test Equipment Signal Routing |
Use Scenario: Interfacing modern microcontrollers to legacy ISA or VMEbus peripherals operating at 5 V. IC Role / Device Role / Timing Role: Logic-level compatible repeater isolating timing domains between new and old subsystems. Use Value: 1–6.5 ns propagation delay preserves bus cycle timing while 100 mV hysteresis rejects coupling noise from adjacent slots. | Use Scenario: Configurable signal path switching in automated test equipment (ATE) fixture boards. IC Role / Device Role / Timing Role: Programmable gate enabling/disabling DUT signal channels under MCU control. Use Value: Independent OE pins allow per-channel routing without FPGA I/O overhead; Ioff protects DUT during power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125APW | 3.3-V only supply (1.65–3.6 V); lower drive (−24/24 mA); CMOS input thresholds | Requires level-shifting for 5-V systems; unsuitable for direct TTL replacement | Select only for new 3.3-V designs where lower power and smaller die size outweigh drive loss |
| SN74ABT244PW | Octal configuration (8 channels); identical 5-V specs and TSSOP-20 package | Higher channel count increases PCB area and routing complexity for quad-only needs | Choose when system requires ≥6 buffered lines and board space permits larger footprint |
Compared with SN74LVC125APW and SN74ABT244PW, the SN74ABT125PW uniquely balances 5-V TTL compatibility, per-channel 3-state control, and compact TSSOP-14 packaging-making it optimal for retrofitting legacy 5-V systems where pin count and voltage alignment are critical.
Availability
SN74ABT125PW is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory address buffering, and legacy system bus extension requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT125PW 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 decades of heritage in industrial-grade logic families.
The ABT logic family-including SN74ABT125PW-is engineered for high-noise industrial environments, delivering robust 5-V TTL compatibility, hot-swap readiness, and superior ground-bounce suppression in space-constrained applications.
FAQ
What is the maximum allowable output current for SN74ABT125PW in continuous operation?
The SN74ABT125PW supports up to 64 mA sink current (IOL) and −32 mA source current (IOH) per output, but continuous operation above 24 mA IOH or 48 mA IOL requires derating per thermal limits. With θJA = 113°C/W and 85°C ambient, max continuous power is ~360 mW-limiting sustained high-drive operation to ≤2 outputs active simultaneously.
Does SN74ABT125PW require external pull-up resistors on its output-enable pins?
Yes-TI recommends tying each OE pin to VCC via a pull-up resistor to ensure high-impedance state during power-up. Minimum resistance is determined by the driver's current-sinking capability; for typical microcontroller GPIO, 10-kΩ is sufficient. Leaving OE floating violates recommended operating conditions and risks bus contention.
Can SN74ABT125PW be used in mixed-voltage systems with 3.3-V controllers?
No-SN74ABT125PW is strictly a 5-V device (4.5–5.5 V supply). Its TTL-compatible inputs accept 2.0 V VIH minimum, but 3.3-V logic may not reliably exceed this threshold. For 3.3-V systems, use SN74LVC125APW instead; interfacing SN74ABT125PW directly with 3.3-V controllers requires level-shifting circuitry.
How does the Ioff feature of SN74ABT125PW protect during hot insertion?
The Ioff circuitry in SN74ABT125PW actively disables all outputs when VCC = 0 V, preventing current backflow from live backplane traces into the unpowered IC. This eliminates risk of damage to the SN74ABT125PW or upstream drivers during card insertion/removal-meeting industrial hot-swap reliability requirements without external protection components.
What is the significance of the 100-mV input hysteresis specified for SN74ABT125PW?
The 100-mV input hysteresis in SN74ABT125PW raises the VIH threshold to ~2.1 V and lowers the VIL threshold to ~0.7 V, creating a noise margin that rejects transients on OE and A inputs. This prevents false toggling in electrically noisy environments-such as motor-driven industrial cabinets-where edge rates are slow or EMI coupling is significant.
SN74ABT125PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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-TSSOP
SN74ABT125PW FAQ
1.How can I place an order for SN74ABT125PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT125PW 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 SN74ABT125PW reliable?
The price and inventory of SN74ABT125PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT125PW is usually 5 days.
3.What payment methods are accepted for SN74ABT125PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT125PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT125PW?
SN74ABT125PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT125PW 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 SN74ABT125PW?
For technical support, including SN74ABT125PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT125PW requirements.
6.How does Aetrix verify that SN74ABT125PW is sourced from the original manufacturer or authorized distributors?
All SN74ABT125PW 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 SN74ABT125PW meets industry standards.
7.What is the process for return or replacement of SN74ABT125PW?
All SN74ABT125PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT125PW, 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 SN74ABT125PW part is unused and in its original packaging.
Return procedure for SN74ABT125PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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