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onsemi MM74HC126M
- Part No.:
- MM74HC126M
- Manufacturer:
- onsemi
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MM74HC126M.pdf
- Description:
- IC BUFFER NON-INVERT 6V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,104
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Product details
Overview
MM74HC126M from ON Semiconductor is a quad non-inverting 3-state buffer IC designed for bus interface and signal isolation in digital systems. It operates across 2V–6V supply, delivers 13ns typical propagation delay at 4.5V, supports 15 LS-TTL loads, and features active-low 3-state control enabling bidirectional bus management in microcontroller peripherals and memory address/data lines.
For engineers reviewing the MM74HC126M datasheet, pinout, applications, or equivalent options, this page provides verified functional specifications, SOIC-14 package details, truth table behavior, real-world timing constraints, and validated alternative options for bus buffering in industrial control, instrumentation, and legacy TTL/CMOS mixed-signal designs.
Technical Context
The MM74HC126M implements four independent non-inverting buffers, each with an active-low 3-state enable (C) controlling output high-impedance state. Its CMOS silicon-gate architecture ensures low static current (≤80µA at 6V) while maintaining TTL-compatible drive strength (±7.8mA output sink/source at 6V).
Input thresholds scale with VCC (VIH = 3.15V min at 4.5V; VIL = 1.35V max), and AC performance is characterized at CL = 50pF with specified enable/disable times (tPZH ≤25ns, tPHZ ≤25ns at 4.5V). All inputs include diode-based ESD protection to VCC and GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V–6V - Enables direct interfacing with 3.3V and 5V logic families without level shifters. |
| Propagation Delay (tPLH/tPHL) | 13ns typical at VCC=4.5V, CL=45pF - Supports >30MHz bus toggle rates in buffered address/data paths. |
| Output Drive Current | ±7.8mA at VCC=6V - Sufficient to drive 15 LS-TTL loads or 50pF+ trace capacitance without signal degradation. |
| 3-State Enable Polarity | Active-low (C low = output enabled) - Matches common bus controller assertion logic for write-enable or chip-select signals. |
| Quiescent Supply Current | 80µA maximum at VCC=6V - Enables low-power operation in battery-backed or always-on monitoring subsystems. |
| Input Leakage Current | ±1.0µA maximum at VCC=6V - Ensures reliable high-impedance input sampling without pull-up/down loading errors. |
Pinout & Package
MM74HC126M is housed in a 14-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-012, 0.150" narrow body, with 1.27mm lead pitch and gull-wing leads. Thermal resistance θJA is 125°C/W (SOIC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Buffer Input (A1–A4) | Non-inverting data inputs; accept 2V–6V logic levels with hysteresis-free CMOS thresholds. |
| 2, 5, 11, 14 | Buffer Output (Y1–Y4) | Push-pull CMOS outputs; enter high-impedance state when corresponding C pin is high. |
| 3, 6, 12, 9 | 3-State Control (C1–C4) | Active-low enables; low = output driven, high = output Z (high-impedance); no internal pull-up/down. |
| 7 | GND | Ground reference for all I/O and supply pins; must be low-impedance connection to minimize noise coupling. |
| 14 | VCC | Positive supply rail; decoupling capacitor (0.1µF ceramic) required within 10mm of pin for stable AC operation. |
Key Features
| Feature | Design Value |
|---|---|
| Low-power CMOS technology | Quiescent ICC ≤80µA at 6V - Reduces system standby power in multi-buffer configurations without compromising speed. |
| Wide voltage operation | 2V–6V supply range - Allows single-supply interoperability between 3.3V microcontrollers and 5V peripheral buses. |
| High fanout capability | Fanout of 15 LS-TTL loads - Eliminates need for additional drivers when interfacing to legacy TTL-based logic arrays or displays. |
| Controlled 3-state transition | tPZH/tPHZ ≤25ns at 4.5V - Minimizes bus contention windows during direction switching in half-duplex communication interfaces. |
| ESD-protected inputs | Diode clamps to VCC and GND - Withstands ±2kV HBM ESD without external protection components in industrial environments. |
Applications
| Microcontroller Bus Interface | Memory Address Latching |
|---|---|
|
Use Scenario: Isolating GPIO pins of an ARM Cortex-M0+ MCU from a shared 8-bit parallel bus connected to multiple peripherals. IC Role / Device Role / Timing Role: Quad buffer providing direction-controlled signal isolation; active-low enables synchronized with WR# strobe. Use Value: Prevents bus contention during simultaneous read/write cycles; 13ns delay ensures setup/hold compliance with 20MHz bus clock. |
Use Scenario: Driving 16-bit address lines from a Z80 CPU to dual-port SRAM and EPROM in retro-computing hardware. IC Role / Device Role / Timing Role: Non-inverting buffer with 3-state outputs enabling time-multiplexed address/data sharing on same pins. Use Value: Fanout of 15 LS-TTL loads supports full address decoding tree without signal degradation across 15cm PCB traces. |
| Industrial Sensor Data Multiplexing | Legacy TTL-to-CMOS Translation |
|
Use Scenario: Aggregating analog-to-digital converter outputs from four temperature sensors into a single serial data stream via multiplexer control. IC Role / Device Role / Timing Role: Signal conditioning buffer isolating ADC digital outputs from noisy PLC backplane; C pins controlled by FPGA select lines. Use Value: 2V–6V operation allows direct connection to 3.3V ADCs and 5V FPGA I/O banks without level-shifting circuitry. |
Use Scenario: Interfacing 74LS138 decoder outputs to HC-series logic in mixed-technology test equipment backplanes. IC Role / Device Role / Timing Role: Level translator and current booster ensuring LS-TTL VOH/VOL compatibility with HC input thresholds. Use Value: VIH = 3.15V min at 4.5V guarantees reliable recognition of LS-TTL HIGH (2.7V) under worst-case VCC and temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad non-inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC126N | Same logic function and pinout; TI version has slightly higher ICC (160µA max at 6V) and wider tPLH/tPHL tolerance (20ns max vs. 18ns). | Valid for drop-in replacement where 5V-only operation suffices; not rated for 2V minimum supply. | Select SN74HC126N if sourcing from TI-authorized channels and operating strictly at 4.5–5.5V. |
| 74VHC126M | Higher speed (tPLH/tPHL = 7.5ns typ at 5V), lower ICC (20µA max), but narrower VCC range (2V–5.5V) and reduced output drive (±8mA). | Better suited for high-frequency clock distribution or fast data capture; less tolerant of 6V legacy systems. | Choose 74VHC126M when timing budget is critical and supply is regulated ≤5.5V. |
Compared with SN74HC126N and 74VHC126M, the MM74HC126M offers the widest supply range (2–6V), lowest quiescent current among HC variants, and proven robustness in mixed-voltage industrial bus designs-making it optimal for legacy system upgrades and multi-rail embedded controllers.
Availability
MM74HC126M is available at Aetrix Electronics and suitable for industrial control panels, test instrumentation, retro-computing hardware, and mixed-voltage embedded systems requiring stable component supply over extended production lifecycles.
Supply support for MM74HC126M 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, logic, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The MM74HC126M belongs to the legacy HC logic family acquired from Fairchild Semiconductor, engineered for robust 3-state bus interfacing in mixed-technology digital systems with wide supply tolerance and low static power.
FAQ
What is the logic function of the MM74HC126M?
The MM74HC126M contains four independent non-inverting buffers, each with an active-low 3-state enable input (C). When C is low, the output Y follows input A; when C is high, Y enters high-impedance state. This behavior is confirmed in the truth table on page 2 of the Fairchild Rev. 1.3.0 datasheet and applies identically to the MM74HC126M.
Does the MM74HC126M support 3.3V operation?
Yes, the MM74HC126M supports 3.3V operation across its full –40°C to +85°C temperature range. At VCC = 3.3V, VIH is guaranteed ≥2.1V and VIL ≤1.1V per DC Electrical Characteristics table (page 4), and propagation delay remains within specification (tPLH/tPHL ≤25ns at 3.3V, CL = 50pF).
What is the maximum capacitive load the MM74HC126M can drive reliably?
The MM74HC126M is characterized up to 150pF load capacitance. At VCC = 4.5V and CL = 150pF, tPLH/tPHL is guaranteed ≤130ns (page 5), and output rise/fall times remain ≤42ns. For stable operation beyond 150pF, external series termination or reduced slew rate may be required.
Is the MM74HC126M pin-compatible with the MM74HC125M?
No-the MM74HC126M and MM74HC125M share identical pinouts but differ in 3-state control polarity: MM74HC126M uses active-low enable (C low = output enabled), while MM74HC125M uses active-high enable (C high = output enabled). Swapping them without logic inversion will cause functional failure.
What package options are available for the MM74HC126M?
The MM74HC126M is specifically offered in the 14-lead SOIC package (JEDEC MS-012, 0.150" narrow body, M14A designation). Other variants like MM74HC126SJ (SOP), MM74HC126MTC (TSSOP), and MM74HC126N (PDIP) exist but are distinct orderable part numbers-not interchangeable with MM74HC126M.
MM74HC126M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HC
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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-SOIC
MM74HC126M FAQ
1.How can I place an order for MM74HC126M through Aetrix?
Please submit a Request for Quotation (RFQ) for MM74HC126M 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 MM74HC126M reliable?
The price and inventory of MM74HC126M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM74HC126M is usually 5 days.
3.What payment methods are accepted for MM74HC126M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM74HC126M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM74HC126M?
MM74HC126M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM74HC126M 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 MM74HC126M?
For technical support, including MM74HC126M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM74HC126M requirements.
6.How does Aetrix verify that MM74HC126M is sourced from the original manufacturer or authorized distributors?
All MM74HC126M 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 MM74HC126M meets industry standards.
7.What is the process for return or replacement of MM74HC126M?
All MM74HC126M units undergo pre-shipment inspection (PSI). If there is an issue with MM74HC126M, 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 MM74HC126M part is unused and in its original packaging.
Return procedure for MM74HC126M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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