My Inquiry
My Account
onsemi MC74AC125MELG
- Part No.:
- MC74AC125MELG
- Manufacturer:
- onsemi
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MC74AC125MELG.pdf
- Description:
- IC BUFF NON-INVERT 6V SOEIAJ-14
- Quantity:
- Payment:
- Shipping:
Inventory:3,258
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MC74AC125MELG from onsemi is a quad 3-state buffer with low-enable control, designed for bus interface and data routing in high-speed digital systems. It features CMOS technology, operates from 2.0 V to 6.0 V, delivers ±24 mA output drive, supports propagation delays as low as 1.0 ns (at 5.0 V), and is packaged in Pb-free TSSOP-14 for space-constrained PCBs used in industrial control logic.
For engineers reviewing the MC74AC125MELG datasheet, pinout, applications, or equivalent options, this device is selected for bidirectional bus buffering where low-power, rail-to-rail voltage compatibility, fast enable/disable timing, and guaranteed 3-state isolation are required in mixed-voltage logic domains.
Technical Context
The MC74AC125MELG implements four independent non-inverting buffers, each with an active-low 3-state enable input (Bn). Its silicon-gate CMOS architecture ensures low static current and high noise immunity across −40°C to +85°C ambient operation. Input thresholds scale with VCC, supporting TTL- and CMOS-level signal interfacing without level shifters.
Each channel provides true 3-state output control with tPZH/tPLZ ≤ 8.0 ns and tPHZ/tPLZ ≤ 9.5 ns at 5.0 V/50 pF, enabling clean bus arbitration in shared-data-path applications. The device exhibits no internal latch-up risk below 100 mA injection and meets JESD22-A114 human-body ESD > 2000 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - supports direct interface with 3.3 V and 5.0 V logic families without external regulators |
| Output Drive | ±24 mA - sufficient to drive 10 LSTTL loads or 50 pF transmission lines at full speed |
| Propagation Delay | 1.0–7.5 ns - enables sub-100 MHz clock-domain data transfer with deterministic timing margins |
| Enable/Disable Time | tPZH/tPLZ ≤ 8.0 ns, tPHZ/tPLZ ≤ 9.5 ns - minimizes bus contention window during state transitions |
| Input Thresholds | VIH = 2.1 V (min @ 3.0 V), VIL = 0.9 V (max @ 3.0 V) - compatible with both CMOS and TTL input logic levels |
| Quiescent Current | ICC ≤ 80 µA - enables use in low-power standby modes without significant leakage penalty |
| ESD Rating | HBM > 2000 V - withstands typical handling and board-level electrostatic discharge events |
Pinout & Package
Packaged in Pb-free TSSOP-14 (Case 948G), the MC74AC125MELG uses a 4.4 mm × 5.0 mm footprint with 0.65 mm pitch, optimized for automated SMT assembly and thermal performance in dense layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | A0–A3 (Data Inputs) | Non-inverting input per buffer channel; accepts CMOS/TTL-compatible logic levels |
| 2, 5, 11, 14 | B0–B3 (Enable Inputs) | Active-low 3-state control; drives output to high-impedance when HIGH |
| 3, 6, 12, 9 | O0–O3 (Outputs) | Buffered, non-inverted outputs with ±24 mA sink/source capability |
| 7 | GND | Ground reference for all inputs, outputs, and internal circuitry |
| 14 | VCC | Primary power supply pin; must be decoupled locally with 0.1 µF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent 3-state buffers | Enables simultaneous control of four data paths with separate enable signals for flexible bus arbitration |
| Low-enable active logic | Reduces external inversion logic; simplifies connection to microcontroller GPIOs configured as open-drain or active-low controls |
| Wide VCC range (2.0–6.0 V) | Eliminates need for voltage translators when interfacing between 3.3 V controllers and 5.0 V peripherals |
| High-speed enable/disable timing | Sub-10 ns output enable/disable ensures minimal bus contention in multi-master systems |
| Pb-free TSSOP-14 package | Meets RoHS compliance requirements and supports fine-pitch reflow profiles without lead coalescence |
Applications
| Industrial PLC I/O Expansion | Embedded Microcontroller Bus Interface |
|---|---|
Use Scenario: Expanding GPIO count on a programmable logic controller by connecting multiple sensor modules to a shared parallel data bus. IC Role / Device Role / Timing Role: Bidirectional bus buffer isolating sensor read/write cycles from main CPU bus; enables time-multiplexed access without signal contention. Use Value: Prevents bus lockup during hot-swap of peripheral modules using precise 3-state control and <9.5 ns disable timing. |
Use Scenario: Interfacing an ARM Cortex-M4 MCU (3.3 V I/O) with legacy 5.0 V SPI peripherals via parallel address/data latching. IC Role / Device Role / Timing Role: Level-translating buffer driving 5.0 V address lines while accepting 3.3 V control signals; operates within 2.0–6.0 V VCC range. Use Value: Eliminates discrete level-shifter ICs and reduces BOM count by leveraging native voltage-tolerant inputs and rail-swing outputs. |
| Test Equipment Signal Routing | Digital Audio Data Multiplexer |
Use Scenario: Dynamic reconfiguration of signal paths inside automated test equipment to route DUT signals to different measurement instruments. IC Role / Device Role / Timing Role: High-isolation 3-state switch enabling glitch-free path selection; driven by FPGA control logic with precise timing alignment. Use Value: Achieves >50 dB off-state isolation and <10 ns switching latency, critical for sub-ns timing accuracy in high-speed parametric testing. |
Use Scenario: Selecting between multiple I²S audio sources (DACs, SPDIF receivers) feeding a single audio processor in a smart speaker platform. IC Role / Device Role / Timing Role: Synchronous data bus gate controlling audio sample word transmission; enabled only during valid frame periods. Use Value: Prevents bus contention-induced pops/clicks using guaranteed high-impedance state and <10 ns enable response time. |
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 |
|---|---|---|---|
| SN74LVC125APWR | Lower VCC range (1.65–3.6 V); 24 mA drive; 3.3 V only; smaller TSSOP-14 footprint (4.4 × 3.0 mm) | Restricted to 3.3 V systems; unsuitable for mixed 5 V/3.3 V interfaces | Select when operating exclusively in low-voltage embedded designs with strict board area constraints. |
| 74HC125D,653 | Slower max speed (tPD = 18 ns @ 4.5 V); higher ICC (≤ 160 µA); same SOIC-14 package option | Acceptable for <10 MHz bus speeds; less suitable for high-frequency data capture or real-time control loops | Choose for cost-sensitive industrial applications where timing margin exceeds 10 ns and 5 V-only operation is confirmed. |
Compared with SN74LVC125APWR and 74HC125D,653, the MC74AC125MELG uniquely supports dual-rail interoperability (2.0–6.0 V), delivers faster propagation and enable timing, and maintains robust 3-state isolation-making it optimal for mixed-voltage bus arbitration where timing precision and voltage flexibility are jointly critical.
Availability
MC74AC125MELG is available at Aetrix Electronics and suitable for industrial PLC expansion, embedded microcontroller bus interface, test equipment signal routing, and digital audio multiplexing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC74AC125MELG 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MC74AC125MELG belongs to onsemi's 74AC logic family, engineered for high-speed, low-power digital interfacing in harsh-environment applications demanding wide voltage tolerance, strong noise immunity, and reliable 3-state control.
FAQ
What is the maximum operating frequency supported by the MC74AC125MELG?
The MC74AC125MELG does not specify a maximum clock frequency directly, but its propagation delay (tPLH/tPHL ≤ 7.5 ns at 5.0 V) and enable/disable times (<10 ns) support reliable operation in digital buses up to approximately 100 MHz under controlled load conditions (CL = 50 pF). System-level timing must account for board trace delays and fanout.
Does the MC74AC125MELG require external pull-up or pull-down resistors on its enable inputs?
No, the MC74AC125MELG has CMOS input structure with negligible DC leakage (IIN ≤ ±1.0 µA), so B0–B3 enable inputs may be driven directly from microcontroller GPIOs or logic gates without external biasing. Pull-ups are only needed if the driving source cannot guarantee defined logic states during reset or power-up.
Can the MC74AC125MELG safely interface between 3.3 V and 5.0 V logic domains?
Yes - the MC74AC125MELG operates from 2.0 V to 6.0 V and accepts input voltages from 0 V to VCC. When powered at 5.0 V, its VIH (≥3.15 V) and VIL (≤1.35 V) thresholds fully accommodate 3.3 V logic HIGH/LOW levels, enabling seamless bidirectional level translation without additional components.
Is the MC74AC125MELG pin-compatible with the MC74ACT125 series?
Yes - the MC74AC125MELG shares identical pinout and package dimensions with MC74ACT125 variants (e.g., MC74ACT125DTR2G), but differs electrically: ACT versions feature TTL-compatible inputs (VIH/VIL fixed at 2.0 V/0.8 V), whereas AC versions have VCC-referenced thresholds. Functionally interchangeable only if input logic family matches design requirements.
What is the thermal resistance (θJA) of the MC74AC125MELG in its TSSOP-14 package?
The MC74AC125MELG in TSSOP-14 (Case 948G) has a junction-to-ambient thermal resistance (θJA) of 150°C/W, measured per JESD51-7 in still air. This value assumes standard PCB layout with minimal copper pour; actual thermal performance improves significantly with internal ground/power planes and thermal vias beneath the exposed pad (if present).
MC74AC125MELG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74AC
- Package/Case:
- 14-SOIC (0.209", 5.30mm 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:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOEIAJ-14
MC74AC125MELG FAQ
1.How can I place an order for MC74AC125MELG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74AC125MELG 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 MC74AC125MELG reliable?
The price and inventory of MC74AC125MELG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74AC125MELG is usually 5 days.
3.What payment methods are accepted for MC74AC125MELG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74AC125MELG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74AC125MELG?
MC74AC125MELG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74AC125MELG 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 MC74AC125MELG?
For technical support, including MC74AC125MELG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74AC125MELG requirements.
6.How does Aetrix verify that MC74AC125MELG is sourced from the original manufacturer or authorized distributors?
All MC74AC125MELG 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 MC74AC125MELG meets industry standards.
7.What is the process for return or replacement of MC74AC125MELG?
All MC74AC125MELG units undergo pre-shipment inspection (PSI). If there is an issue with MC74AC125MELG, 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 MC74AC125MELG part is unused and in its original packaging.
Return procedure for MC74AC125MELG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MC74AC125MELG Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
