CD74HC126MG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments CD74HC126 is a 4-channel non-inverting tri-state CMOS bus driver in a 14-pin SOIC package. Key specs include active-high enable control, 50 pF load capacitance, and 6 mA output sink current. Available from stock worldwide with fast shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 14
- Lifecycle
- OBSOLETE
- Datasheet
- CD74HC126MG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 4-channel non-inverting tri-state outputs enabling bus isolation and signal multiplexing in logic designs
- Active-high enable control per channel providing flexible direction and enable logic in multi-master bus architectures
- HC/UH CMOS family compatibility supporting 2 V to 6 V operation for mixed 3.3 V and 5 V logic interfacing
- 50 pF rated load capacitance ensuring signal integrity on heavily loaded PCB bus lines at high frequency
- Compact 14-pin SOIC package simplifying layout in dense logic boards with standard 1.27 mm pitch footprints
Applications
The CD74HC126MG4 is used as a bus buffer and line driver in microcontroller I/O expansion, memory bus interfaces, and FPGA-to-peripheral signal routing where tri-state control is needed to prevent bus contention. Its active-high enable inputs make it a natural fit for address demultiplexing and data bus buffering in 8-bit and 16-bit embedded systems. The SOIC-14 package and CMOS compatibility also suit industrial logic board designs requiring reliable signal buffering from 2 V to 6 V supply rails.
Specifications
| YTEOL | 0 |
| Control Type | ENABLE HIGH |
| Count Direction | UNIDIRECTIONAL |
| Family | HC/UH |
| JESD-30 Code | R-PDSO-G14 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.006A |
| Number of Bits | 1 |
| Number of Functions | 4 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP14,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Prop. Delay@Nom-Sup | 30ns |
| Propagation Delay (tpd) | 150ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 4.5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How many channels does the CD74HC126MG4 provide and what is the enable polarity for each channel?
The CD74HC126MG4 provides 4 independent non-inverting buffer channels, each controlled by an active-high enable input. When a channel's enable pin is driven high, the output is active and drives the buffered signal; when driven low, the output enters a high-impedance tri-state condition, allowing multiple devices to share the same bus line without contention.
What supply voltage range does the CD74HC126MG4 support and how does this affect its use with 3.3 V microcontrollers?
The CD74HC126MG4 operates from 2 V to 6 V supply, making it compatible with both 3.3 V and 5 V logic systems. When used as a level-interface buffer between a 3.3 V microcontroller and a 5 V peripheral bus, it handles the voltage translation while maintaining valid logic thresholds, provided output current does not exceed the 6 mA maximum sink current specification.
For a memory bus with 50 pF per-line capacitance, is the CD74HC126MG4 able to drive the lines without additional buffering?
Yes, the CD74HC126MG4 is rated for a 50 pF load capacitance per channel, which matches typical backplane or short PCB trace capacitance values in 8-bit memory bus designs. For buses exceeding 50 pF per line or running at speeds above 25 MHz, a higher-drive alternative such as a 74HCT245 with 8 channels and stronger 25 mA drive capability would be more appropriate.
When is CD74HC126MG4 a more compact alternative to CD74HC244 for unidirectional bus buffering?
The CD74HC126MG4 is preferable to the CD74HC244 when independent per-channel tri-state control is needed rather than a single output-enable for all 8 outputs. With 4 individually controllable channels in a 14-pin SOIC versus 8 ganged channels in a 20-pin SOIC, it offers finer control granularity for designs using 4 or fewer signals, reducing package size and board space by roughly 30%.
What is the maximum output sink current for each channel of the CD74HC126MG4 and what does this imply for LED driving?
Each channel of the CD74HC126MG4 has a maximum output sink current of 6 mA. This is sufficient to drive standard 2 mA indicator LEDs directly through a series resistor, but it is not suitable for higher-brightness LEDs requiring 10 mA to 20 mA. For those loads, a dedicated LED driver or a transistor stage would be needed to avoid exceeding the 6 mA output current limit.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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