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Texas Instruments SN74HC125NS
- Part No.:
- SN74HC125NS
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74HC125NS.pdf
- Description:
- IC BUFFER NON-INVERT 6V 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,300
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Product details
Overview
SN74HC125NS from NXP Semiconductors is a quad 3-state buffer/line driver IC with independent active-low output enable inputs (1OE–4OE), CMOS-level input compatibility, and rail-to-rail output swing. It operates from 2.0 V to 6.0 V, supports −40 °C to +125 °C ambient range, and delivers 7.8 mA sink/source drive at 6.0 V-used in bus isolation, data routing, and level translation between mixed-voltage logic subsystems.
For engineers reviewing the SN74HC125NS datasheet, SN74HC125NS pinout, SN74HC125NS application, or SN74HC125NS equivalent, key selection criteria include its 3-state control architecture, 14-pin SOIC (NS) package, propagation delay of 9 ns typical at VCC = 6.0 V, and compliance with JEDEC standard no. 7A for interoperability in industrial digital systems.
Technical Context
This device implements four independent non-inverting buffers, each with dedicated active-low 3-state enable logic. Output impedance exceeds 10⁹ Ω in high-impedance state, enabling clean bus sharing without contention. Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors.
It belongs to the 74HC logic family and uses silicon-gate CMOS technology, delivering TTL-compatible output drive while maintaining CMOS input thresholds. Static power consumption remains below 8.0 μA at 25 °C and 6.0 V supply, supporting low-quiescent-power system design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage (VCC) | 2.0 V to 6.0 V - supports direct interface with 3.3 V and 5 V logic domains without level shifters. |
| Output drive (IO) | ±7.8 mA at VCC = 6.0 V - sufficient to drive 50 pF loads with <30 ns transition time and minimal signal degradation. |
| Propagation delay (tpd) | 9 ns typical (VCC = 6.0 V, CL = 50 pF) - enables reliable operation in 33 MHz+ synchronous bus environments. |
| Enable/disable time (ten/tdis) | 12 ns typical (VCC = 6.0 V) - ensures precise timing control for dynamic bus arbitration and hot-swap signaling. |
| Input leakage (II) | ±0.1 μA max at 25 °C - negligible loading on upstream drivers, critical for high-impedance sensor or microcontroller GPIO interfaces. |
| ESD protection | HBM > 2000 V, MM > 200 V - meets industrial handling requirements without external protection circuitry. |
| Operating temperature | −40 °C to +125 °C - qualified for under-hood automotive modules, motor drives, and industrial PLC I/O stages. |
Pinout & Package
SN74HC125NS is supplied in a 14-lead plastic small outline package (SO14, SOT108-1) with 3.9 mm body width, gull-wing leads, and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | 1OE, 2OE, 3OE, 4OE | Active-low 3-state enable inputs - each controls one buffer independently; pulled HIGH disables output (Z-state). |
| 2, 5, 9, 12 | 1A, 2A, 3A, 4A | Buffer input terminals - accept CMOS-level signals; internal clamp diodes permit overvoltage-safe interfacing. |
| 3, 6, 8, 11 | 1Y, 2Y, 3Y, 4Y | Non-inverting buffered outputs - present high-impedance (Z) state when corresponding OE is HIGH. |
| 7 | GND | Ground reference (0 V) - must be low-inductance connection to minimize switching noise coupling. |
| 14 | VCC | Positive supply rail - bypass capacitor (100 nF ceramic) required within 10 mm for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent 3-state buffers | Enables selective isolation of four signal paths on shared buses without external gating logic. |
| CMOS input thresholds | VIH = 3.15 V min at VCC = 4.5 V - ensures robust noise margin (>1.3 V) against ground bounce in dense PCB layouts. |
| Rail-to-rail output swing | VOL = 0.16 V max, VOH = 5.48 V min at 7.8 mA load - maintains full logic swing across full operating voltage and temperature range. |
| Input clamp diodes | Permits safe interface to signals up to VCC + 0.5 V using series current-limiting resistors - eliminates need for external TVS or Schottky clamps. |
| Low dynamic power | CPD = 22 pF - limits switching power dissipation to <1.5 mW per buffer at 10 MHz, reducing thermal load in compact assemblies. |
Applications
| Industrial Bus Isolation | Microcontroller GPIO Expansion |
|---|---|
|
Use Scenario: Isolating multiple SPI or parallel data buses in programmable logic controllers to prevent signal contention during firmware updates. IC Role / Device Role / Timing Role: SN74HC125NS acts as bidirectional bus gate, enabling/disabling data flow per peripheral using discrete OE lines synchronized to controller timing. Use Value: Eliminates need for multiplexers or complex FPGA logic; reduces BOM count by consolidating four independent gating functions in one SOIC-14 package. |
Use Scenario: Expanding limited GPIO count on ARM Cortex-M0+ microcontrollers to drive LED arrays, relays, and status indicators in medical diagnostic equipment. IC Role / Device Role / Timing Role: SN74HC125NS serves as output driver stage, translating low-drive MCU pins into 7.8 mA capable outputs with precise 3-state control for safe hot-plug sequencing. Use Value: Provides deterministic output disable during reset or sleep modes, preventing unintended actuation of connected loads during power transitions. |
| Digital Test Equipment Signal Routing | Mixed-Voltage Logic Interface |
|
Use Scenario: Routing test vectors between FPGA-based pattern generators and DUTs with varying voltage rails (1.8 V, 3.3 V, 5 V) in automated test fixtures. IC Role / Device Role / Timing Role: SN74HC125NS functions as voltage-tolerant signal repeater, accepting CMOS inputs up to VCC and driving outputs compatible with downstream logic families. Use Value: Enables single-footprint interface solution across multiple DUT voltage classes, reducing fixture redesign effort and calibration complexity. |
Use Scenario: Interfacing 3.3 V FPGA I/O banks to legacy 5 V TTL peripherals in industrial HMIs without level-shifter ICs or resistor networks. IC Role / Device Role / Timing Role: SN74HC125NS operates at 5 V VCC to provide 5 V-compatible outputs while accepting 3.3 V CMOS inputs directly - leveraging VIH/VIL margins for reliable detection. Use Value: Achieves level translation with zero propagation delay penalty and no additional timing skew versus discrete solutions. |
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 |
|---|---|---|---|
| SN74HCT125NS | Uses TTL-compatible input thresholds (VIH = 2.0 V min at VCC = 4.5 V); identical pinout and output specs. | Better suited for direct interface with legacy 5 V TTL outputs; less noise margin with modern CMOS drivers. | Select SN74HCT125NS only when driving from 5 V TTL sources; otherwise SN74HC125NS offers superior noise immunity. |
| MC74HC125AD | ON Semiconductor variant in SOIC-14; identical electrical specs but different ESD rating (HBM > 4000 V). | Preferred where enhanced ESD robustness is required in manufacturing or field-repair environments. | MC74HC125AD is a drop-in alternative with higher HBM rating; verify qualification for extended temperature range if needed. |
Compared with SN74HCT125NS, SN74HC125NS provides tighter input noise margins for CMOS-driven systems, while MC74HC125AD offers higher ESD tolerance without altering timing or drive capability-making SN74HC125NS optimal for new designs prioritizing signal integrity in mixed-logic environments.
Availability
SN74HC125NS is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded control applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for SN74HC125NS 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
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT markets, with deep expertise in logic, interface, and power management ICs.
The SN74HC125NS belongs to NXP's 74HC high-speed CMOS logic family, engineered for low-power, high-noise-immunity digital interfacing in harsh industrial and automotive-adjacent environments.
FAQ
What is the maximum clock frequency supported by SN74HC125NS in a bus application?
SN74HC125NS does not operate as a clocked device but as a combinatorial buffer. Its 9 ns typical propagation delay at VCC = 6.0 V supports reliable data transfer in synchronous buses up to ~33 MHz (1/tpd). For higher frequencies, ensure trace length matching and proper termination to maintain signal integrity-SN74HC125NS itself imposes no inherent clock rate limit beyond its specified timing parameters.
Can SN74HC125NS safely interface a 5 V microcontroller output to a 3.3 V FPGA input?
No-SN74HC125NS is not a level translator in that direction. Its outputs swing rail-to-rail (0 V to VCC), so with VCC = 5 V, outputs reach 5 V, which exceeds the absolute maximum input voltage of most 3.3 V FPGAs. To interface safely, power SN74HC125NS at 3.3 V and use it as a buffer for 3.3 V signals only, or add external clamping. SN74HC125NS must never drive 3.3 V inputs while powered at 5 V.
Does SN74HC125NS require external pull-up or pull-down resistors on its OE pins?
SN74HC125NS OE pins have no internal pull resistors and must be actively driven. Leaving them floating risks undefined output states. For default-disabled operation, connect each OE to VCC via a 10 kΩ pull-up; for default-enabled, tie to GND. In microcontroller-controlled systems, drive OE directly from GPIO pins configured as open-drain or push-pull outputs-SN74HC125NS expects clean logic-level control.
How does the input clamp diode in SN74HC125NS affect its use with overvoltage signals?
The built-in input clamp diodes allow SN74HC125NS to tolerate input voltages up to VCC + 0.5 V safely-provided external current-limiting resistors restrict diode conduction to ≤20 mA (per Table 4). This enables direct connection to 5 V signals while powered at 3.3 V, as long as a ≥100 Ω series resistor is used. Exceeding this current risks latch-up or permanent damage-SN74HC125NS does not support sustained overvoltage operation.
Is SN74HC125NS pin-compatible with older 74LS125 devices?
No-SN74HC125NS is not pin-compatible with 74LS125. While both are quad 3-state buffers, 74LS125 uses a different pinout: OE inputs are shared (not individual), and pin assignments for A/Y/GND/VCC differ. Attempting PCB reuse will cause functional failure. SN74HC125NS requires its own layout; verified alternatives like SN74HCT125NS share identical pinout and can substitute directly if TTL input compatibility is acceptable.
SN74HC125NS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Bulk
- 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:
- 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-SO
SN74HC125NS FAQ
1.How can I place an order for SN74HC125NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC125NS 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 SN74HC125NS reliable?
The price and inventory of SN74HC125NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC125NS is usually 5 days.
3.What payment methods are accepted for SN74HC125NS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC125NS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC125NS?
SN74HC125NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC125NS 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 SN74HC125NS?
For technical support, including SN74HC125NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC125NS requirements.
6.How does Aetrix verify that SN74HC125NS is sourced from the original manufacturer or authorized distributors?
All SN74HC125NS 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 SN74HC125NS meets industry standards.
7.What is the process for return or replacement of SN74HC125NS?
All SN74HC125NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC125NS, 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 SN74HC125NS part is unused and in its original packaging.
Return procedure for SN74HC125NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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