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Texas Instruments SN74HC125PWT
- Part No.:
- SN74HC125PWT
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HC125PWT.pdf
- Description:
- IC BUFFER NON-INVERT 6V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:762
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Product details
Overview
SN74HC125PWT from Texas Instruments is a quadruple non-inverting buffer with 3-state outputs, designed for bus interface and signal routing in digital logic systems. It operates across 2 V to 6 V supply voltage, supports –40°C to +85°C ambient temperature, delivers propagation delay as low as 11 ns at 6 V (CL = 50 pF), and features balanced CMOS 3-state outputs enabling high-impedance bus sharing in microcontroller peripheral interfaces.
For engineers reviewing the SN74HC125PWT datasheet, SN74HC125PWT pinout, SN74HC125PWT application, or SN74HC125PWT equivalent, this page provides verified functional identity, TSSOP-14 package mapping, confirmed 3-state timing behavior, real-world bus enable use cases, and two validated alternative parts with documented functional and parametric differences.
Technical Context
The SN74HC125PWT implements four independent positive-logic buffers (Y = A) with active-low 3-state output enables (OE). Each channel operates with standard CMOS inputs and balanced CMOS 3-state outputs capable of sourcing/sinking up to ±7.8 mA at 6 V while maintaining VOL ≤ 0.33 V and VOH ≥ 5.34 V.
Its switching behavior is characterized by enable/disable delays (ten/tdis) and propagation delay (tpd) tightly coupled to load capacitance (CL = 50 pF or 150 pF) and supply voltage (2 V, 4.5 V, or 6 V), with transition times (tt) as fast as 6 ns at 6 V - confirming suitability for medium-speed digital bus control where deterministic tri-state arbitration is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 6 V - supports mixed-voltage system interfacing (e.g., 3.3 V MCU to 5 V peripheral) |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and instrumentation |
| Propagation Delay (tpd) | 11 ns max at 6 V, CL = 50 pF - enables reliable timing in 30+ MHz bus clock domains |
| Output Drive (IOH/IOL) | ±7.8 mA at 6 V - sufficient to drive 10 LSTTL loads or light capacitive buses (<70 pF) |
| 3-State Leakage (IOZ) | ±0.5 µA max at 6 V - ensures minimal bus contention current during high-impedance state |
| Input Capacitance (Ci) | 10 pF max - limits loading on upstream drivers and preserves signal edge integrity |
| Power Dissipation Cap. (Cpd) | 45 pF per gate - enables accurate dynamic power estimation in CMOS logic designs |
Pinout & Package
TSSOP-14 package (5.00 mm × 4.40 mm body size), thermally enhanced for surface-mount assembly in space-constrained PCBs; pin 1 marked via dot or bevelled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Channel OE (active-low) | Independent 3-state enable per buffer; asserts high-impedance output when HIGH |
| 2, 5, 9, 12 | Channel A (input) | Non-inverting data input; CMOS-compatible threshold (VIH = 3.15 V @ 4.5 V VCC) |
| 3, 6, 8, 11 | Channel Y (output) | 3-state buffered output; drives HIGH/LOW or floats based on corresponding OE state |
| 7 | GND | Ground reference for all logic and output stages; must be low-impedance return path |
| 14 | VCC | Positive supply rail; requires local 0.1 µF bypass capacitor adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Quadruple independent buffers | Enables simultaneous control of four discrete signals or one 4-bit data bus without inter-channel coupling |
| Active-low 3-state outputs | Allows safe bidirectional bus sharing - only one device drives while others float, preventing contention |
| Balanced CMOS output drive | Sources and sinks near-identical current (±7.8 mA), ensuring symmetrical rise/fall times and noise margin |
| Wide VCC range (2–6 V) | Eliminates level-shifting between 2.5 V, 3.3 V, and 5 V logic domains in mixed-supply systems |
| Low ICC (80 µA max) | Reduces quiescent power in always-on control logic, critical for battery-backed or energy-sensitive applications |
Applications
| Microcontroller Bus Interface | Industrial I/O Expansion |
|---|---|
|
Use Scenario: Isolating an MCU's parallel address/data bus from peripheral ICs during sleep mode or configuration changes. IC Role / Device Role / Timing Role: SN74HC125PWT acts as a 4-bit directional bus buffer, enabling/disabling signal flow via independent OE lines synchronized to MCU control timing. Use Value: Prevents back-driving of powered-down peripherals and eliminates bus contention during state transitions, improving system reliability. |
Use Scenario: Expanding GPIO count on PLC or HMI controller using shift-register-based I/O modules. IC Role / Device Role / Timing Role: SN74HC125PWT buffers and gates serial control signals (e.g., CLK, LAT, DATA) driving daisy-chained output latches. Use Value: Ensures clean, slew-controlled edges reach downstream latches, reducing setup/hold violations and EMI in noisy factory environments. |
| Test Equipment Signal Gating | Legacy System Logic Translation |
|
Use Scenario: Enabling precise signal injection into DUT circuits during automated test, with zero leakage when disabled. IC Role / Device Role / Timing Role: SN74HC125PWT serves as a gated signal repeater, where OE controls test stimulus delivery with nanosecond-level timing accuracy. Use Value: IOZ ≤ ±0.5 µA guarantees no DC loading on high-impedance DUT nodes during off-state, preserving measurement fidelity. |
Use Scenario: Interfacing modern 3.3 V FPGA I/O banks to legacy 5 V TTL logic in avionics maintenance equipment. IC Role / Device Role / Timing Role: SN74HC125PWT functions as a unidirectional level-tolerant driver, translating 3.3 V logic levels to full 5 V swing while meeting VIH/VIL thresholds. Use Value: Eliminates external resistive dividers or dedicated level shifters, simplifying BOM and layout for retrofit upgrades. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT125PW | CMOS input thresholds shifted to TTL-compatible levels (VIH = 2.0 V min); identical pinout and timing | Better suited for direct interfacing with legacy 5 V TTL outputs without pull-ups | Select when driving from older 5 V TTL sources; not recommended for pure CMOS systems due to higher static current |
| MC74HC125ADT | Same logic function and specs, but in SOIC-14 (D) package; thermal resistance RθJA = 133.6°C/W vs. 151.7°C/W for TSSOP | Preferred for through-hole prototyping or higher-power dissipation scenarios where board area allows larger footprint | Choose for manual assembly, thermal margin priority, or compatibility with existing SOIC footprints |
Compared with SN74HC125PWT, SN74HCT125PW offers TTL-input compatibility at the cost of slightly higher ICC, while MC74HC125ADT trades compact TSSOP packaging for improved thermal performance and SOIC assembly flexibility - both require no schematic change but differ in layout and system-level interface assumptions.
Availability
SN74HC125PWT is available at Aetrix Electronics and suitable for industrial control panels, test instrumentation, and embedded communication interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.
Supply support for SN74HC125PWT 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 and embedded processing solutions, with over 50 years of logic IC innovation and broad distribution infrastructure.
The SN74HC125PWT belongs to TI's industry-standard 74HC logic family, engineered for low-power, wide-voltage digital interfacing in industrial, automotive, and communications equipment where robustness and interoperability are essential.
FAQ
What is the maximum capacitive load the SN74HC125PWT can reliably drive?
The SN74HC125PWT is characterized for optimal performance with ≤70 pF total load capacitance, as confirmed in TI's application guidance. At CL = 50 pF, propagation delay remains ≤31 ns (6 V), and transition time stays ≤15 ns. Driving >150 pF increases tpd to 39 ns and tt to 53 ns, risking timing violations in synchronous systems - external series termination is advised for heavier loads.
Does the SN74HC125PWT support mixed-voltage operation between input and output sides?
No - the SN74HC125PWT is a single-supply device: all inputs and outputs reference the same VCC rail (2–6 V). It does not provide level translation. Input thresholds scale with VCC (e.g., VIH = 3.15 V at 4.5 V), and outputs swing rail-to-rail. For true level shifting, a dedicated translator like TXB0104 is required alongside SN74HC125PWT.
How should unused inputs and outputs be handled on the SN74HC125PWT?
Unused inputs must be terminated to VCC or GND - floating CMOS inputs cause excessive current draw and potential oscillation. A 10-kΩ pull-up/down resistor is typical. Unused outputs may be left unconnected (floating) since they enter high-impedance state when OE is HIGH; do not tie them directly to VCC or GND to avoid damaging the 3-state driver.
What is the absolute maximum output current rating for the SN74HC125PWT?
The absolute maximum continuous output current for the SN74HC125PWT is ±35 mA per output pin, as specified in Absolute Maximum Ratings. However, functional operation at that level violates recommended conditions: the datasheet guarantees VOL ≤ 0.33 V only up to 7.8 mA sink at 6 V. Exceeding ±7.8 mA risks violating VOL/VOH specs and increasing junction temperature beyond safe limits.
Is the SN74HC125PWT pin-compatible with other packages in the same family?
Yes - the SN74HC125PWT (TSSOP-14) shares identical pin numbering and function mapping with SN74HC125D (SOIC), SN74HC125DB (SSOP), and SN74HC125N (PDIP). Pin 1 is OE for Channel 1, pin 2 is A1, pin 3 is Y1, continuing through pin 14 (VCC). This enables drop-in replacement across packages when board layout accommodates footprint differences.
SN74HC125PWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
SN74HC125PWT FAQ
1.How can I place an order for SN74HC125PWT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC125PWT 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 SN74HC125PWT reliable?
The price and inventory of SN74HC125PWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC125PWT is usually 5 days.
3.What payment methods are accepted for SN74HC125PWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC125PWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC125PWT?
SN74HC125PWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC125PWT 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 SN74HC125PWT?
For technical support, including SN74HC125PWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC125PWT requirements.
6.How does Aetrix verify that SN74HC125PWT is sourced from the original manufacturer or authorized distributors?
All SN74HC125PWT 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 SN74HC125PWT meets industry standards.
7.What is the process for return or replacement of SN74HC125PWT?
All SN74HC125PWT units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC125PWT, 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 SN74HC125PWT part is unused and in its original packaging.
Return procedure for SN74HC125PWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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