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Texas Instruments SN74AHC125NG4
- Part No.:
- SN74AHC125NG4
- Manufacturer:
- Texas Instruments
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74AHC125NG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,578
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Product details
Overview
SN74AHC125NG4 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 from 2 V to 5.5 V, supports −40°C to 125°C ambient temperature, delivers ±8 mA output drive at 5 V, and features four individual OE pins enabling per-channel enable/disable control - used in programmable logic controllers and motor drive I/O expansion.
For engineers reviewing the SN74AHC125NG4 datasheet, SN74AHC125NG4 pinout, SN74AHC125NG4 application, or SN74AHC125NG4 equivalent, key selection criteria include its 14-pin PDIP package, independent 3-state control per buffer, guaranteed high-impedance state during power sequencing, and compatibility with mixed-voltage logic interfaces across industrial automation and PoE-powered equipment.
Technical Context
The SN74AHC125NG4 implements four identical non-inverting buffer gates, each with dedicated active-low output-enable (OE) control. When OE is low, the A input passes directly to Y; when OE is high, Y enters high-impedance state - enabling bus sharing without contention. All buffers share a common VCC and GND, with no internal inter-gate coupling.
Its AHC logic family ensures CMOS-level power efficiency and TTL-compatible voltage thresholds. Input transition rate limits (20 ns/V at 5 V) and guaranteed noise immunity (±0.8 V dynamic VOL/VOH) support reliable operation in electrically noisy industrial environments where microcontroller GPIOs interface with external sensors or actuators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 5.5 V - enables direct interfacing with 3.3 V and 5 V logic domains without level shifters |
| Output Drive | ±8 mA at VCC = 5 V - sufficient to drive standard CMOS loads and short PCB traces without buffering |
| Propagation Delay | 3.8 ns (A→Y, CL = 15 pF, VCC = 5 V) - supports >100 MHz data rates in point-to-point routing |
| Input Thresholds | VIH = 3.85 V, VIL = 1.65 V at VCC = 5.5 V - ensures robust noise margin against EMI in industrial settings |
| Quiescent Current | 40 µA max at TA = −40°C to 125°C - suitable for always-on monitoring circuits with low standby power budgets |
| ESD Rating | ±1500 V HBM - meets IEC 61000-4-2 Level 2 for handling in uncontrolled assembly environments |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive modules and industrial motor drives |
Pinout & Package
SN74AHC125NG4 uses a 14-pin plastic dual in-line package (PDIP), body size 19.30 mm × 6.35 mm, with through-hole mounting and industry-standard pin spacing (0.1 inch). Pin 1 is top-left corner, notch-up orientation.
| 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-up to ensure safe high-Z state |
| 2, 5, 9, 12 | A1–A4 | Buffer input terminals - accept CMOS/TTL logic levels; VI ≤ 5.5 V absolute max allows hot-swap tolerance |
| 3, 6, 8, 11 | Y1–Y4 | Buffer output terminals - three-state (low/high/Z); IO = ±25 mA absolute max per pin |
| 7 | GND | Ground reference - all logic thresholds and output states referenced to this node |
| 14 | VCC | Power supply - bypass capacitor (0.1 µF ceramic) required adjacent to pin for stable switching |
| - | NC | No internal connection - pins 1, 5, 7, 11, 15, 17 in LCCC variant only; not present on PDIP |
Key Features
| Feature | Design Value |
|---|---|
| Independent 3-state control per buffer | Enables selective isolation of up to four data lines - critical for multiplexing GPIO resources in PLC backplanes |
| Wide supply range (2 V–5.5 V) | Supports interoperability between legacy 5 V peripherals and modern 3.3 V microcontrollers without external level translation |
| High-impedance power-up default | Prevents bus contention during system reset - achieved by tying OE pins to VCC via pullup resistors |
| Low input capacitance (10 pF) | Minimizes loading on driving sources - preserves signal integrity in fan-out-heavy sensor interface networks |
| Latch-up immunity (>250 mA) | Guarantees robustness against transient overcurrent events in motor drive feedback paths |
Applications
| Programmable Logic Controllers | Motor Drives and Controls |
|---|---|
Use Scenario: Isolating field I/O signals (digital inputs from limit switches, outputs to solenoids) from CPU bus during configuration or fault conditions. IC Role / Device Role / Timing Role: Bus buffer providing per-channel 3-state gating - decouples CPU address/data bus from peripheral modules during reconfiguration. Use Value: Prevents spurious actuation during firmware updates; enables hot-swap capability for modular I/O cards. | Use Scenario: Routing encoder quadrature signals and PWM gate-drive enable commands between MCU and power stage. IC Role / Device Role / Timing Role: Signal isolator and level translator - buffers 3.3 V MCU outputs to 5 V-rated gate drivers while blocking noise coupling. Use Value: Eliminates ground-loop interference in high-current motor phases; maintains timing integrity with <9.5 ns propagation delay. |
| Power Over Ethernet (PoE) | Electronic Point-of-Sale |
Use Scenario: Managing data path selection between PoE PSE controller and powered device interface ICs during power negotiation. IC Role / Device Role / Timing Role: Bidirectional bus switch - routes MDI pair status signals and classification data without loading the PHY layer. Use Value: Ensures IEEE 802.3af/at compliance by preventing signal degradation during Class detection handshake. | Use Scenario: Expanding GPIO count on embedded POS terminal SoC to support barcode scanner trigger, cash drawer solenoid, and receipt printer handshaking. IC Role / Device Role / Timing Role: Parallel I/O expander - converts four MCU GPIOs into eight controllable signal paths via OE-selectable buffers. Use Value: Reduces BOM cost vs. dedicated I/O expanders; supports simultaneous cash drawer open + printer busy signaling. |
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 V–5.5 V); higher speed (2.5 ns @ 3.3 V); 14-pin TSSOP only | Better suited for portable battery-powered devices requiring sub-2 V operation | Select when system VCC may drop below 2 V or when <3 ns propagation is mandatory |
| 74AHC125D | Same AHC logic family and specs; obsolete SOIC-14 variant (TI part # SN74AHC125D) | Legacy board replacements where footprint matches but RoHS compliance is not required | Use only for repair of existing designs; not recommended for new designs due to obsolescence status |
Compared with SN74LVC125APWR and 74AHC125D, SN74AHC125NG4 provides superior thermal performance in through-hole mounting (RθJA = 56.3°C/W), full industrial temperature support, and proven reliability in vibration-prone PLC enclosures - making it the preferred choice for fixed-installation industrial control hardware.
Availability
SN74AHC125NG4 is available at Aetrix Electronics and suitable for programmable logic controllers, motor drives and controls, and Power Over Ethernet (PoE) equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHC125NG4 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets since 1930.
The SN74AHC125NG4 belongs to TI's AHC logic family - engineered for low-power, high-speed CMOS operation in industrial control and automation systems where reliability, wide voltage tolerance, and deterministic 3-state behavior are essential.
FAQ
What is the maximum operating temperature for SN74AHC125NG4?
The SN74AHC125NG4 is rated for continuous operation from −40°C to +125°C ambient temperature. This specification is validated per JEDEC JESD78 and applies across the full recommended supply voltage range (2 V to 5.5 V), making SN74AHC125NG4 suitable for under-hood automotive modules and industrial motor drive control boards exposed to high thermal stress.
How should unused OE pins be handled on SN74AHC125NG4?
Unused OE pins on SN74AHC125NG4 must be tied to VCC via a pullup resistor to guarantee high-impedance output state during power-up and prevent bus contention. TI recommends 10 kΩ for most applications; lower values (≤1 kΩ) improve noise immunity in EMI-heavy environments. Floating OE pins are strictly prohibited - they risk undefined output states and potential latch-up.
Does SN74AHC125NG4 support mixed-voltage interfacing between 3.3 V and 5 V systems?
Yes, SN74AHC125NG4 supports mixed-voltage operation: its 2 V–5.5 V supply range and input tolerance up to 5.5 V allow direct connection to 3.3 V microcontrollers while driving 5 V peripherals. However, VIH/VIL thresholds scale with VCC - at VCC = 5 V, VIH(min) = 3.85 V, so 3.3 V logic HIGH must be verified compatible or buffered. SN74AHC125NG4 does not perform active level translation.
What is the recommended bypass capacitor for SN74AHC125NG4?
Texas Instruments specifies a 0.1 µF ceramic capacitor placed as close as possible to the VCC pin (Pin 14) and GND (Pin 7) of SN74AHC125NG4. For systems with multiple logic devices, parallel 0.01 µF and 1 µF capacitors are recommended to suppress both high-frequency switching noise and low-frequency supply droop. The capacitor must be X7R or better dielectric with ≤2 mm trace length.
Can SN74AHC125NG4 replace SN74AHC125N in existing designs?
Yes, SN74AHC125NG4 is a functionally identical, RoHS-compliant revision of SN74AHC125N - same PDIP-14 package, pinout, electrical specifications, and thermal characteristics. The "G4" suffix denotes green packaging (lead-free, halogen-free) and updated manufacturing process. No PCB or firmware changes are required when migrating from SN74AHC125N to SN74AHC125NG4.
SN74AHC125NG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
SN74AHC125NG4 FAQ
1.How can I place an order for SN74AHC125NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC125NG4 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 SN74AHC125NG4 reliable?
The price and inventory of SN74AHC125NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC125NG4 is usually 5 days.
3.What payment methods are accepted for SN74AHC125NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC125NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC125NG4?
SN74AHC125NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC125NG4 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 SN74AHC125NG4?
For technical support, including SN74AHC125NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC125NG4 requirements.
6.How does Aetrix verify that SN74AHC125NG4 is sourced from the original manufacturer or authorized distributors?
All SN74AHC125NG4 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 SN74AHC125NG4 meets industry standards.
7.What is the process for return or replacement of SN74AHC125NG4?
All SN74AHC125NG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC125NG4, 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 SN74AHC125NG4 part is unused and in its original packaging.
Return procedure for SN74AHC125NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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