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Texas Instruments SN74AHCT125PWR
- Part No.:
- SN74AHCT125PWR
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT125PWR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,315
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Product details
Overview
SN74AHCT125PWR from Texas Instruments is a quadruple 3-state bus buffer gate IC used for digital signal routing, isolation, and level translation in 5-V logic systems. It features four independent buffers, TTL-compatible inputs (VIH = 2 V, VIL = 0.8 V), ±8 mA output drive, and operates across –40°C to +85°C. It enables/disables data paths in microcontroller I/O expansion, LED control, and switch debouncing circuits.
For engineers reviewing the SN74AHCT125PWR datasheet, SN74AHCT125PWR pinout, SN74AHCT125PWR application, or SN74AHCT125PWR equivalent, key selection criteria include 3-state output control per channel, 5-V supply compatibility, SOIC/TSSOP package footprint, propagation delay ≤6.5 ns (CL = 15 pF), and input transition rate tolerance ≥20 ns/V.
Technical Context
The SN74AHCT125PWR implements four independent CMOS buffer gates with active-low 3-state enable logic: each output enters high-impedance when its dedicated OE pin is HIGH, and passes A→Y when OE is LOW. Its TTL-voltage-compatible inputs accept 0.8 V/2.0 V thresholds while driving standard CMOS loads.
It uses silicon-gate CMOS technology with latch-up immunity exceeding 250 mA per JESD17, supports capacitive loads up to 50 pF, and requires unused inputs tied to VCC or GND to prevent floating states. Power supply bypassing with a 0.1-μF capacitor near VCC is mandatory for stable switching performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V logic rails and stable VOH/VOL performance |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - enables direct interfacing with legacy TTL outputs without level shifters |
| Output Drive | ±8 mA - sufficient to drive multiple 74-series inputs or small LEDs directly |
| Propagation Delay | tPLH/tPHL ≤ 6.5 ns @ CL = 15 pF - supports reliable operation in 100-MHz+ data paths with margin |
| Power Consumption | ICC ≤ 20 µA @ static, ΔICC ≤ 1.5 mA per active input - enables low-quiescent-current system design |
| Operating Temperature | –40°C to +85°C - qualified for commercial industrial environments including motor controls and instrumentation |
| ESD Rating | Human Body Model ≥ 2000 V - meets basic handling robustness requirements for board assembly |
Pinout & Package
TSSOP-14 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, exposed pad optional, RoHS-compliant, moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output enable | Individually disables corresponding buffer output into high-Z state; tie to VCC via pullup for power-up high-Z safety |
| 1A–4A | Buffer input | Accepts TTL/CMOS logic signals; must be terminated if unused to avoid oscillation |
| 1Y–4Y | Buffer output | 3-state push-pull output; drives loads up to 50 pF; never connect directly to another output |
| VCC (Pin 14) | Positive supply | 5-V rail connection; requires local 0.1-μF bypass capacitor placed adjacent to pin |
| GND (Pin 7) | Ground reference | Return path for all I/O and supply currents; recommended to use solid ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Independent 3-state control per channel | Enables selective isolation of four data lines using separate OE pins - critical for multiplexed I/O expansion |
| TTL-compatible input thresholds | VIH = 2.0 V / VIL = 0.8 V allows direct connection to 74LS, 74F, and microcontroller GPIO without external biasing |
| Latch-up immunity >250 mA | Meets JESD17 specification - prevents destructive failure during transient overvoltage or ESD events |
| Low dynamic power dissipation | Cpd = 14 pF - minimizes switching current and heat generation in high-frequency bus applications |
| Robust noise margins | VIL(D) = 0.8 V, VIH(D) = 2.0 V, VOL(P) = 0.8 V - ensures reliable operation in electrically noisy industrial environments |
Applications
| Microcontroller I/O Expansion | LED Indicator Control |
|---|---|
Use Scenario: Expanding limited GPIO count on an MCU by enabling/disabling peripheral data lines via software-controlled OE signals. IC Role / Device Role / Timing Role: Bus buffer with per-channel 3-state control - acts as programmable signal gate between MCU and peripherals. Use Value: Eliminates need for discrete transistors or complex CPLD logic; reduces BOM cost and PCB area vs. alternative solutions. | Use Scenario: Driving multiple status LEDs from shared MCU port pins while preventing backfeed or contention. IC Role / Device Role / Timing Role: Digital switch with current-limited push-pull outputs - provides isolated, controllable current sink/source per LED. Use Value: Enables single-port multi-LED control without external current-limiting resistors on each line (when used with series resistor at common anode/cathode). |
| Switch Debouncing Circuit | Noise-Immune Signal Conditioning |
Use Scenario: Cleaning mechanical switch bounce in industrial HMI panels or relay feedback monitoring. IC Role / Device Role / Timing Role: Input filter and driver - converts slow/noisy switch transitions into clean, fast CMOS-level signals. Use Value: Replaces RC + Schmitt-trigger discrete designs; improves reliability and reduces component count in space-constrained enclosures. | Use Scenario: Isolating sensitive analog or communication lines from noisy digital domains in mixed-signal PCBs. IC Role / Device Role / Timing Role: Directional signal isolator - blocks ground loops and crosstalk while passing validated logic levels. Use Value: Prevents false triggering in UART, SPI, or sensor interfaces where slow edges or EMI cause metastability in downstream logic. |
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 voltage range (1.65–3.6 V), higher speed (tPD ≤ 3.7 ns), lower drive (±24 mA), no TTL input compatibility | Designed for 3.3-V or mixed-voltage systems; unsuitable for direct 5-V TTL interface | Select when operating below 3.6 V or requiring faster timing; verify input compatibility with source drivers. |
| 74AHC125PW | Same 5-V operation but CMOS-only inputs (VIH = 3.5 V), slightly higher ICC (≤100 µA), identical pinout and function | Requires CMOS-level input sources; not compatible with 74LS or older TTL outputs | Prefer when sourcing only from modern 5-V CMOS devices and lower static current is prioritized over TTL interoperability. |
Compared with SN74LVC125APW and 74AHC125PW, the SN74AHCT125PWR uniquely supports legacy TTL inputs at 5 V while maintaining full 3-state functionality - making it the only drop-in solution for upgrading aging 74LS-based systems without redesigning driver stages.
Availability
SN74AHCT125PWR is available at Aetrix Electronics and suitable for microcontroller I/O expansion, LED indicator control, and switch debouncing applications requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant TSSOP packaging.
Supply support for SN74AHCT125PWR 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 connectivity solutions for industrial, automotive, and consumer markets.
The SN74AHCT125PWR belongs to TI's 74AHCT logic family, engineered specifically for seamless 5-V TTL-to-CMOS interfacing in industrial control, test equipment, and legacy system upgrades where input compatibility and robust noise immunity are critical.
FAQ
What is the maximum capacitive load the SN74AHCT125PWR can drive while meeting datasheet timing specs?
The SN74AHCT125PWR guarantees switching characteristics (tPLH, tPHL, tPZH, etc.) up to 15 pF load capacitance. While it can physically drive up to 50 pF, timing parameters degrade beyond 15 pF - for designs requiring full spec compliance, keep total node capacitance ≤15 pF. For heavier loads, add series termination or buffer staging.
Does the SN74AHCT125PWR require external pull-up resistors on OE pins for safe power-up behavior?
Yes - to ensure all outputs remain in high-impedance during power-up/power-down, each OE pin should be tied to VCC through a pull-up resistor. TI recommends ≥10 kΩ for commercial temperature range operation. This prevents unintended signal assertion before firmware initializes the OE control lines.
Can unused inputs on the SN74AHCT125PWR be left floating?
No - all unused inputs on the SN74AHCT125PWR must be terminated to either VCC or GND. Floating CMOS inputs cause increased supply current, potential oscillation, and reduced noise immunity. A 10-kΩ pull-up or pull-down resistor is preferred for unused A or OE pins to maintain defined logic states.
Is the SN74AHCT125PWR pin-compatible with other 74xx125 variants in TSSOP-14 packages?
Yes - the SN74AHCT125PWR shares identical pinout, footprint, and terminal functions with SN74LVC125APW, SN74AHC125PW, and SN74LV125APW in PW (TSSOP-14) packaging. However, electrical compatibility depends on voltage ranges and input thresholds - always verify VIH/VIL and VCC limits before substitution.
What thermal derating applies to the SN74AHCT125PWR in continuous operation?
The SN74AHCT125PWR has θJA = 147.7°C/W in TSSOP-14 (PW) package. At 5 V and 25°C ambient, with all four buffers switching at 10 MHz into 15-pF loads, typical power dissipation is ~12 mW - resulting in <2°C junction rise. Derating becomes necessary only above 70°C ambient or under sustained high-output-current conditions (>5 mA average per channel).
SN74AHCT125PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 14-TSSOP (0.173", 4.40mm 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:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
SN74AHCT125PWR FAQ
1.How can I place an order for SN74AHCT125PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT125PWR 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 SN74AHCT125PWR reliable?
The price and inventory of SN74AHCT125PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT125PWR is usually 5 days.
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SN74AHCT125PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT125PWR 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 SN74AHCT125PWR?
For technical support, including SN74AHCT125PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT125PWR requirements.
6.How does Aetrix verify that SN74AHCT125PWR is sourced from the original manufacturer or authorized distributors?
All SN74AHCT125PWR 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 SN74AHCT125PWR meets industry standards.
7.What is the process for return or replacement of SN74AHCT125PWR?
All SN74AHCT125PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT125PWR, 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 SN74AHCT125PWR part is unused and in its original packaging.
Return procedure for SN74AHCT125PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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