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Texas Instruments SN74AHCT125PWRG4
- Part No.:
- SN74AHCT125PWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT125PWRG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,300
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Product details
Overview
SN74AHCT125PWRG4 from Texas Instruments is a quadruple 3-state bus buffer gate IC with independent output-enable control per channel, TTL-compatible inputs (VIH = 2 V, VIL = 0.8 V), ±8 mA output drive at 5 V, and 14-pin TSSOP package. It enables/disables digital signals in data bus isolation, LED control, and switch debouncing applications.
For engineers reviewing the SN74AHCT125PWRG4 datasheet, SN74AHCT125PWRG4 pinout, SN74AHCT125PWRG4 application, or SN74AHCT125PWRG4 equivalent, key selection criteria include 3-state output timing (tPLH/tPHL ≤ 6.5 ns @ CL = 15 pF), input voltage compatibility with legacy TTL logic, thermal performance (θJA = 147.7 °C/W), and RoHS-compliant TSSOP-14 packaging for high-density PCB layouts.
Technical Context
The SN74AHCT125PWRG4 implements four independent CMOS buffer gates, each with dedicated active-low output-enable (OE) control. Each gate passes A→Y when OE is low and presents high-impedance output when OE is high - enabling bidirectional bus arbitration without contention.
It operates within 4.5 V to 5.5 V supply range, supports TTL-level inputs (2 V VIH min, 0.8 V VIL max), and delivers rail-to-rail output swing with VOH ≥ 3.8 V and VOL ≤ 0.44 V under 8 mA load - ensuring robust noise margins in mixed-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V logic rails and tolerant of ±5% regulation variation. |
| Input Compatibility | TTL-voltage compatible (VIH ≥ 2 V, VIL ≤ 0.8 V) - interfaces directly with legacy 5 V TTL outputs without level-shifting. |
| Output Drive | ±8 mA at VCC = 4.5–5.5 V - sufficient to drive multiple CMOS inputs or small LEDs with series resistor. |
| Propagation Delay | tPLH/tPHL ≤ 6.5 ns @ CL = 15 pF - ensures sub-7 ns signal path timing for synchronous bus control. |
| 3-State Enable/Disable | tPZH/tPHZ ≤ 8 ns @ CL = 15 pF - fast output transition into/out of high-Z state minimizes bus contention windows. |
| Power Consumption | ICC ≤ 20 µA (static), Cpd = 14 pF - ultra-low quiescent current supports battery-sensitive designs. |
| Operating Temperature | –40 °C to +85 °C - qualified for commercial industrial environments including motor controls and instrumentation. |
Pinout & Package
Packaged in a 14-pin Thin Shrink Small Outline Package (TSSOP), SN74AHCT125PWRG4 features 0.65 mm lead pitch, exposed pad optional for thermal relief, and JEDEC-standard footprint compatible with automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 (OE1–OE4) | Active-low output enable | Individually disables corresponding buffer output to high-impedance state; tie high via pullup for power-up safety. |
| 2, 5, 9, 12 (A1–A4) | Buffer input | Accepts TTL/CMOS logic levels; must be terminated to VCC or GND if unused to prevent floating inputs. |
| 3, 6, 8, 11 (Y1–Y4) | Buffer output | 3-state push-pull output; drives loads up to 50 pF while meeting timing specs; unused outputs may float. |
| 7 | GND | Ground reference for all logic and power domains; requires low-impedance connection to system ground plane. |
| 14 | VCC | Positive supply (4.5–5.5 V); requires local 0.1 µF bypass capacitor placed adjacent to pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Independent 3-state control per channel | Enables selective bus line isolation - e.g., route one microcontroller GPIO to multiple peripherals without hardware multiplexer. |
| TTL-compatible inputs | Eliminates need for external level shifters when interfacing with legacy 5 V TTL sources like 74LS or microcontroller parallel ports. |
| Latch-up immunity > 250 mA | Meets JESD17 specification - ensures robustness against transient overcurrent events in noisy industrial environments. |
| Low input capacitance (Ci = 10 pF) | Minimizes loading on driving source - preserves signal integrity and rise/fall times in high-speed digital paths. |
| High-impedance state during power sequencing | OE tied to VCC via pullup ensures outputs remain disabled during power-up/down - prevents bus contention or backfeeding. |
Applications
| Industrial Bus Isolation | LED Indicator Control |
|---|---|
|
Use Scenario: Isolating microcontroller GPIO lines from shared I²C or SPI bus segments to prevent contention during firmware updates or peripheral hot-swap. IC Role / Device Role / Timing Role: SN74AHCT125PWRG4 acts as a directional bus gate - enabling only one master's data path while tri-stating others using synchronized OE signals. Use Value: Prevents signal corruption and latch-up risk by eliminating simultaneous drive on bidirectional buses, leveraging sub-7 ns propagation delay for real-time response. |
Use Scenario: Driving multiple status LEDs from a single microcontroller port where current sourcing capability is insufficient for direct drive. IC Role / Device Role / Timing Role: SN74AHCT125PWRG4 serves as a current-boosting buffer - each Y output sinks up to 8 mA to illuminate LEDs with discrete current-limiting resistors. Use Value: Enables reliable LED activation without degrading MCU GPIO voltage levels or exceeding its absolute maximum sink current rating. |
| Switch Debounce Circuit | Digital Signal Enabling |
|
Use Scenario: Conditioning mechanical switch inputs in programmable logic controllers (PLCs) to eliminate contact bounce artifacts before reaching FPGA or MCU interrupt pins. IC Role / Device Role / Timing Role: SN74AHCT125PWRG4 functions as a gated signal conditioner - OE driven by RC-filtered switch output, passing clean transitions only after settling. Use Value: Reduces firmware overhead by offloading debounce logic to hardware, using precise 3-state timing to suppress transients < 10 ns wide. |
Use Scenario: Selectively enabling/disabling clock or data signals between subsystems in test equipment - e.g., routing ADC sample clocks only during acquisition phases. IC Role / Device Role / Timing Role: SN74AHCT125PWRG4 operates as a synchronous signal gate - OE controlled by system controller to assert or block signal flow with nanosecond precision. Use Value: Achieves deterministic signal gating with tPZH ≤ 6 ns, avoiding metastability and ensuring clean edge alignment across multi-board systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT125DR | Same logic function and electrical specs, but in SOIC-14 (wider 1.27 mm pitch) instead of TSSOP-14. | Preferred for through-hole prototyping or legacy board rework where TSSOP reflow is unavailable. | Select SN74AHCT125DR when manual soldering or wave-solder compatibility is required; SN74AHCT125PWRG4 preferred for space-constrained SMT production. |
| SN74LVC125APWR | Lower VCC range (1.65–3.6 V), higher speed (tPD ≤ 3.7 ns), but not TTL-input compatible - requires ≥1.7 V VIH at 3.3 V. | Suitable for modern 3.3 V systems with LVTTL or LVCMOS signaling, not for 5 V TTL interface. | Choose SN74LVC125APWR only in 3.3 V-only designs; SN74AHCT125PWRG4 remains mandatory for mixed 5 V TTL/CMOS environments. |
Compared with SN74AHCT125DR and SN74LVC125APWR, SN74AHCT125PWRG4 uniquely balances 5 V TTL compatibility, TSSOP-14 miniaturization, and industrial temperature support - making it the sole choice for new 5 V embedded control designs requiring surface-mount scalability and legacy interoperability.
Availability
SN74AHCT125PWRG4 is available at Aetrix Electronics and suitable for industrial bus isolation, LED indicator control, switch debouncing, and digital signal enabling requiring stable component supply across extended product lifecycles.
Supply support for SN74AHCT125PWRG4 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 SN74AHCT125PWRG4 belongs to TI's AHCT logic family - engineered for seamless 5 V TTL-to-CMOS interfacing in industrial control, instrumentation, and legacy system upgrades where reliability and voltage compatibility are critical.
FAQ
What is the recommended power supply decoupling for SN74AHCT125PWRG4?
TI specifies a 0.1 µF ceramic bypass capacitor placed as close as possible to the VCC pin (Pin 14) of SN74AHCT125PWRG4 to suppress high-frequency noise and stabilize supply voltage during switching transients. For enhanced noise rejection, pairing with a 1 µF capacitor in parallel is acceptable - both must connect directly between VCC and GND with minimal trace length and no vias in the return path.
Can SN74AHCT125PWRG4 drive a 50 pF capacitive load while maintaining timing specifications?
Yes - SN74AHCT125PWRG4 is fully characterized for CL = 50 pF in its switching characteristics table, with tPLH/tPHL ≤ 8.5 ns and tPZH/tPHZ ≤ 10 ns at VCC = 5 V. Exceeding 50 pF may degrade timing margins and increase propagation delay beyond datasheet limits, so layout parasitics and downstream loading must be included in total CL calculation for SN74AHCT125PWRG4.
How should unused inputs be handled on SN74AHCT125PWRG4?
All unused inputs on SN74AHCT125PWRG4 - including A1–A4 and OE1–OE4 - must be terminated to either VCC or GND to prevent floating states that cause increased ICC, oscillation, or ESD susceptibility. A 10 kΩ pullup or pulldown resistor is recommended for flexibility; direct connection is acceptable if the signal state is fixed and unchanging in the final design.
Is SN74AHCT125PWRG4 pin-compatible with other AHCT125 variants in TSSOP-14?
Yes - SN74AHCT125PWRG4 shares identical pinout, electrical behavior, and thermal characteristics with SN74AHCT125PWR and SN74AHCT125PWR.A in the same TSSOP-14 (PW) package. The "G4" suffix denotes TI's green (lead-free, RoHS-compliant) material finish and does not affect functionality, timing, or pin assignment of SN74AHCT125PWRG4.
What is the maximum continuous output current per channel for SN74AHCT125PWRG4?
The absolute maximum continuous output current per channel of SN74AHCT125PWRG4 is ±25 mA, as specified in Absolute Maximum Ratings. However, for guaranteed operation within datasheet timing and voltage specs, the recommended limit is ±8 mA - the value used in Electrical Characteristics testing for VOH/VOL and switching parameters. Exceeding ±8 mA risks violating VOL ≤ 0.44 V or VOH ≥ 3.8 V at VCC = 4.5–5.5 V.
SN74AHCT125PWRG4 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:
- Discontinued at Digi-Key
- 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
SN74AHCT125PWRG4 FAQ
1.How can I place an order for SN74AHCT125PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT125PWRG4 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 SN74AHCT125PWRG4 reliable?
The price and inventory of SN74AHCT125PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT125PWRG4 is usually 5 days.
3.What payment methods are accepted for SN74AHCT125PWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT125PWRG4 transactions.
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4.How is shipping managed for SN74AHCT125PWRG4?
SN74AHCT125PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT125PWRG4 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 SN74AHCT125PWRG4?
For technical support, including SN74AHCT125PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT125PWRG4 requirements.
6.How does Aetrix verify that SN74AHCT125PWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT125PWRG4 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 SN74AHCT125PWRG4 meets industry standards.
7.What is the process for return or replacement of SN74AHCT125PWRG4?
All SN74AHCT125PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT125PWRG4, 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 SN74AHCT125PWRG4 part is unused and in its original packaging.
Return procedure for SN74AHCT125PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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