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Texas Instruments SN74AHC125PWRG4
- Part No.:
- SN74AHC125PWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC125PWRG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,795
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Product details
Overview
SN74AHC125PWRG4 from Texas Instruments is a quadruple bus buffer gate with independent 3-state outputs, designed for bidirectional data isolation and signal routing in digital systems. It operates across 2 V to 5.5 V, supports −40 °C to +125 °C industrial temperature range, delivers ±8 mA output drive at 5 V, and features four dedicated OE pins enabling per-channel enable/disable control. It is used in programmable logic controllers to isolate I/O expansion buses.
For engineers reviewing the SN74AHC125PWRG4 datasheet, SN74AHC125PWRG4 pinout, SN74AHC125PWRG4 application, or SN74AHC125PWRG4 equivalent, key selection criteria include its 14-pin TSSOP package, individual output-enable architecture, 3.3 V/5 V logic compatibility, high-impedance state control during power sequencing, and suitability for multiplexing and bus contention management in industrial control and PoE systems.
Technical Context
The SN74AHC125PWRG4 implements four independent CMOS buffer gates, each with a dedicated active-low output-enable (OE) input. When OE is low, the A→Y path is enabled with propagation delay as low as 1 ns (VCC = 5 V, CL = 50 pF); when OE is high, Y enters high-impedance state. Its input thresholds scale with VCC (VIH = 0.7×VCC min, VIL = 0.3×VCC max), ensuring robust noise immunity across supply voltages.
It uses advanced AHC logic family process technology delivering rail-to-rail output swing, low ICC (≤40 µA over full temperature range), and ESD protection of ±1500 V HBM. The device requires external pull-up on OE during power-up/down to guarantee defined high-Z state, and supports mixed-voltage interfacing within absolute input voltage limits (−0.5 V to VCC + 0.5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 5.5 V - enables direct interface with 3.3 V microcontrollers and 5 V legacy peripherals without level shifters. |
| Output Drive Strength | ±8 mA at VCC = 5 V - sufficient to drive standard TTL loads and moderate capacitive buses (≤50 pF) with clean edges. |
| Propagation Delay | 1 ns (min) / 6.5 ns (max) at VCC = 5 V, CL = 15 pF - supports high-speed bus gating in real-time control loops. |
| Input Thresholds | VIH = 3.85 V, VIL = 1.65 V at VCC = 5.5 V - ensures reliable recognition of 3.3 V logic HIGH/LOW when VCC = 5.5 V. |
| Quiescent Current | 40 µA max over −40 °C to +125 °C - minimizes standby power in always-on industrial modules. |
| ESD Rating | ±1500 V HBM - meets IEC 61000-4-2 Level 2 requirements for board-level ESD robustness. |
| Operating Temperature | −40 °C to +125 °C - qualified for under-hood automotive, motor drive, and industrial PLC environments. |
Pinout & Package
TSSOP-14 (PW) package: 5.00 mm × 4.40 mm body, 0.65 mm pitch, surface-mount, lead-free (NIPDAU/SN), moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | OE1–OE4 | Active-low output enable inputs - each controls one buffer independently; must be pulled high via resistor during power transition to ensure safe high-Z default. |
| 2, 5, 9, 12 | A1–A4 | Buffer input terminals - accept CMOS/TTL-compatible signals; VIH/VIL scale with VCC for flexible voltage domain interfacing. |
| 3, 6, 8, 11 | Y1–Y4 | 3-state buffered outputs - drive downstream loads when respective OE is low; enter high-impedance when OE is high to prevent bus contention. |
| 7 | GND | Ground reference - must be connected to system ground plane with low-inductance path to minimize switching noise coupling. |
| 14 | VCC | Power supply - requires local 0.1 µF ceramic bypass capacitor placed adjacent to pin to suppress supply transients. |
Key Features
| Feature | Design Value |
|---|---|
| Four independent 3-state buffers | Enables selective routing of four separate data lines - eliminates need for four discrete buffers or complex mux logic in I/O expansion designs. |
| Individual output-enable control | Permits dynamic bus arbitration: e.g., enable only active sensor channel while isolating idle channels to reduce crosstalk and power. |
| Wide VCC range (2 V–5.5 V) | Supports single-supply operation across 3.3 V and 5 V domains - simplifies power architecture in mixed-voltage systems like PoE-powered edge nodes. |
| High-impedance state guaranteed on power-up | Requires OE tied to VCC via pull-up - prevents output glitches during boot, critical for safe initialization in motor drive gate drivers and PLC backplanes. |
| Low input capacitance (10 pF max) | Minimizes loading on upstream drivers - preserves signal integrity in high-speed clock distribution or address bus applications. |
Applications
| Programmable Logic Controllers | Power Over Ethernet (PoE) |
|---|---|
Use Scenario: Isolating I/O expansion modules from main CPU bus to prevent fault propagation and allow hot-swap capability. IC Role / Device Role / Timing Role: Bus buffer with per-channel OE control acts as configurable gate between CPU data/address bus and peripheral module interfaces. Use Value: Enables modular design with independent enable/disable of up to four I/O banks, reducing PCB complexity versus discrete gating solutions. | Use Scenario: Managing data path between PoE controller IC and powered device (PD) interface logic under varying input voltage conditions. IC Role / Device Role / Timing Role: Level-shifting and bus-isolation buffer that maintains signal integrity across 3.3 V PD logic and 5 V controller domains. Use Value: Wide 2–5.5 V supply range allows direct connection to PoE-derived rails; 3-state outputs prevent backfeeding during PD power-up sequences. |
| Motor Drives and Controls | Electronic Point-of-Sale |
Use Scenario: Routing encoder feedback signals and PWM command lines between MCU and motor driver ICs while preventing cross-talk. IC Role / Device Role / Timing Role: Signal isolator and bus driver with fast 1–6.5 ns propagation delay, supporting closed-loop timing in <100 µs control cycles. Use Value: Independent OE pins allow synchronous disabling of all outputs during fault detection, eliminating spurious gate drive pulses. | Use Scenario: Interfacing barcode scanner, display, and payment terminal modules to a central ARM-based SoC in compact retail hardware. IC Role / Device Role / Timing Role: Multiplexer-style buffer enabling shared data bus access among peripherals with software-selectable channel activation. Use Value: Reduces BOM count by consolidating four isolated signal paths into one 14-pin TSSOP, saving >25 mm² PCB area versus discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125APWR | Lower VCC range (1.65–3.6 V); 24 mA drive at 3.3 V; faster tPLH/tPHL (1.7 ns typ) | Optimized for 3.3 V-only systems; not suitable for 5 V interfaces or mixed-voltage PoE designs | Select when operating exclusively at 3.3 V and higher drive/speed is required; verify OE logic polarity matches. |
| 74AHC125PW,118 (Nexperia) | Identical AHC logic family specs; same 2–5.5 V range, 8 mA drive, and pinout; RoHS-compliant, SMD TSSOP-14 | No functional difference; validated drop-in replacement with identical thermal and timing behavior | Preferred for dual-sourcing; fully compatible with SN74AHC125PWRG4 layout and firmware control logic. |
Compared with SN74LVC125APWR and 74AHC125PW,118, the SN74AHC125PWRG4 uniquely balances 5 V interoperability, industrial temperature support, and TI's long-term supply commitment - making it optimal for PoE infrastructure and motor control where mixed-voltage resilience and lifecycle assurance are critical.
Availability
SN74AHC125PWRG4 is available at Aetrix Electronics and suitable for programmable logic controllers, Power Over Ethernet (PoE) systems, and motor drives requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHC125PWRG4 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 company specializing in analog and embedded processing technologies, with leadership in industrial, automotive, and communications markets.
The SN74AHC125PWRG4 belongs to TI's AHC logic family, engineered for low-power, high-speed CMOS bus interfacing in harsh industrial environments where reliability, wide supply tolerance, and precise 3-state control are essential.
FAQ
What is the recommended pull-up resistor value for OE pins on the SN74AHC125PWRG4 during power-up?
The minimum pull-up resistor value for OE pins on the SN74AHC125PWRG4 is determined by the current-sinking capability of the driving source. TI specifies that OE must be tied to VCC through a pull-up resistor to ensure high-impedance state at power-up; typical values range from 4.7 kΩ to 10 kΩ for standard GPIO drivers. The SN74AHC125PWRG4 datasheet does not define an absolute minimum resistance but emphasizes that the resistor must guarantee OE remains above VIH during VCC ramp-up. Always validate with actual power-rail slew rate and driver strength in your system.
Can the SN74AHC125PWRG4 interface directly between a 3.3 V microcontroller and a 5 V peripheral without level shifting?
Yes, the SN74AHC125PWRG4 can interface directly between a 3.3 V microcontroller and a 5 V peripheral when powered at 5 V. Its input thresholds scale with VCC (VIH = 0.7×VCC min), so at VCC = 5 V, VIH = 3.5 V - which is safely exceeded by a 3.3 V logic HIGH. However, ensure the microcontroller's 3.3 V outputs remain within the SN74AHC125PWRG4's absolute input rating (−0.5 V to VCC + 0.5 V = 5.5 V). No external level shifter is needed for this configuration.
What is the maximum capacitive load the SN74AHC125PWRG4 can drive while maintaining specified timing?
The SN74AHC125PWRG4 is characterized for CL = 15 pF and CL = 50 pF loads in its switching specifications. At VCC = 5 V, propagation delay increases from 3.8 ns (min) to 5.3 ns (min) when CL rises from 15 pF to 50 pF. While the device can drive >50 pF loads, timing margins degrade linearly beyond 50 pF. For designs requiring guaranteed 6.5 ns max delay (VCC = 5 V), TI recommends limiting total load (including trace and input capacitance) to ≤50 pF. Exceeding this requires derating or simulation.
Does the SN74AHC125PWRG4 support hot insertion or live bus swapping?
The SN74AHC125PWRG4 supports hot insertion only when OE pins are held high (disabled) before power application and VCC is ramped cleanly. Its absolute maximum ratings allow input voltages up to VCC + 0.5 V, but applying signal inputs before VCC stabilizes risks latch-up or undefined states. TI recommends using series resistors on A/Y lines and ensuring OE is externally controlled (e.g., via supervisor IC) to force high-Z before power-on. The SN74AHC125PWRG4 itself has no built-in hot-swap circuitry.
How does the SN74AHC125PWRG4 differ from the SN74AHC125DR in terms of performance and application?
The SN74AHC125PWRG4 and SN74AHC125DR share identical electrical specifications, logic function, and temperature rating (−40 °C to +125 °C), differing only in package: PW (TSSOP-14) vs D (SOIC-14). The SN74AHC125PWRG4 offers smaller footprint (5.00 mm × 4.40 mm vs 8.65 mm × 3.91 mm) and finer pitch (0.65 mm vs 1.27 mm), enabling denser layouts in space-constrained applications like PoE injectors and portable motor drives. Both are pin-compatible and electrically interchangeable.
SN74AHC125PWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
SN74AHC125PWRG4 FAQ
1.How can I place an order for SN74AHC125PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC125PWRG4 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 SN74AHC125PWRG4 reliable?
The price and inventory of SN74AHC125PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC125PWRG4 is usually 5 days.
3.What payment methods are accepted for SN74AHC125PWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC125PWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC125PWRG4?
SN74AHC125PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC125PWRG4 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 SN74AHC125PWRG4?
For technical support, including SN74AHC125PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC125PWRG4 requirements.
6.How does Aetrix verify that SN74AHC125PWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AHC125PWRG4 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 SN74AHC125PWRG4 meets industry standards.
7.What is the process for return or replacement of SN74AHC125PWRG4?
All SN74AHC125PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC125PWRG4, 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 SN74AHC125PWRG4 part is unused and in its original packaging.
Return procedure for SN74AHC125PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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