CD74HC138MTG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The CD74HC138MTG4 is a high-speed CMOS 3-line to 8-line decoder/demultiplexer from Texas Instruments, housed in a SOIC-16 package. It operates from 2 V to 6 V, supports 50 pF load capacitance, and features three enable inputs for straightforward bus expansion and memory address decoding.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- CD74HC138MTG4 Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.5413(MOQ 2500)
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of CD74HC138MTG4?
- 3-line to 8-line decoder with active-low outputs for efficient address decoding in digital systems
- Wide 2 V to 6 V supply range compatible with both 3.3 V and 5 V logic families
- Three enable inputs (2 active-low, 1 active-high) allow direct cascading for larger demultiplexer configurations
- High-speed HC CMOS logic with 50 pF rated load capacitance for reliable switching
- SOIC-16 package with green/RoHS-compliant MTG4 suffix for modern PCB assembly
What is CD74HC138MTG4 used for?
The CD74HC138MTG4 is widely used in microprocessor and microcontroller systems for memory address decoding, where a 3-bit address bus selects one of 8 chip-enable lines. It also serves as a 1-of-8 demultiplexer in data routing applications and in industrial control boards for I/O port expansion. Its three enable inputs make it straightforward to cascade multiple devices to decode wider address spaces without additional glue logic.
What are the specifications of CD74HC138MTG4?
| YTEOL | 0 |
| Family | HC/UH |
| Input Conditioning | STANDARD |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | 3-LINE TO 8-LINE DECODER |
| Max I(ol) | 0.004A |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Output Polarity | INVERTED |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.16mA |
| Prop. Delay@Nom-Sup | 30ns |
| Propagation Delay (tpd) | 225ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| 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 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Mexico |
Where can I find the CD74HC138MTG4 datasheet?
CD74HC138MTG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD74HC138MTG4?
Compatible alternatives and drop-in replacements for CD74HC138MTG4:
Frequently Asked Questions
How does the CD74HC138MTG4 use its three enable inputs to simplify multi-chip address decoding?
The CD74HC138MTG4 has two active-low enable inputs (E1, E2) and one active-high enable input (E3). All three must be asserted simultaneously for any output to go low. This lets designers connect upper address lines directly to the enable pins, enabling 8 chip-select lines from a 3-bit address bus without extra logic gates or decoders.
What load capacitance is the CD74HC138MTG4 rated for, and how does it affect signal integrity on a busy bus?
The CD74HC138MTG4 is rated for a load capacitance of 50 pF per output. Exceeding this value increases propagation delay and can cause waveform degradation at the output. For buses with traces longer than about 10 cm or multiple loads, adding series termination resistors of 22 ohm to 33 ohm preserves switching quality and keeps timing within specification.
Is CD74HC138MTG4 a drop-in replacement for 74LS138 in a 5 V system upgrading to green/RoHS-compliant parts?
Yes. The CD74HC138MTG4 is pin-compatible with 74LS138 in a 16-pin SOIC package and operates at 5 V. The HC CMOS variant draws significantly less quiescent current than bipolar LS-TTL, typically under 80 µA versus several milliamps. The MTG4 suffix confirms RoHS-compliant, halogen-free packaging, making it suitable for modern green-compliance product lines.
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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.
More from Texas Instruments
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 2500+ | $0.5690 | $1422.47 |
| 6250+ | $0.5517 | $3448.19 |
| 12500+ | $0.5413 | $6766.13 |
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